Fix and suppress static analyze errors

.env

@@ -0,0 +1 @@
+NSQ_VERSION=1.2.1

.gitattributes

@@ -0,0 +1,21 @@
+# Exclude build/test files from archive
+/.editorconfig          export-ignore
+/.gitattributes         export-ignore
+/.github                export-ignore
+/.gitignore             export-ignore
+/.php_cs                export-ignore
+/.php_cs.dist           export-ignore
+/.psalm                 export-ignore
+/docs                   export-ignore
+/examples               export-ignore
+/infection.json         export-ignore
+/infection.json.dist    export-ignore
+/phpstan.neon           export-ignore
+/phpunit.xml            export-ignore
+/phpunit.xml.dist       export-ignore
+/psalm.xml              export-ignore
+/tests                  export-ignore
+
+# Configure diff output for .php and .phar files.
+*.php diff=php
+*.phar -diff

.github/workflows/ci.yaml

@@ -14,7 +14,7 @@ jobs:
                 os:
                     - ubuntu-latest
                 php:
-                    - '8.0'
+                    - '8.1'
                 dependencies:
                     - lowest
                     - highest
@@ -33,6 +33,7 @@ jobs:
                 with:
                     php-version: ${{ matrix.php }}
                     coverage: pcov
+                    extensions: kjdev/php-ext-snappy@0.2.1
                 env:
                     update: true
 
@@ -76,7 +77,7 @@ jobs:
             -   name: Setup PHP
                 uses: shivammathur/setup-php@v2
                 with:
-                    php-version: '8.0'
+                    php-version: '8.1'
                 env:
                     update: true
 
@@ -107,7 +108,8 @@ jobs:
             -   name: Setup PHP
                 uses: shivammathur/setup-php@v2
                 with:
-                    php-version: '8.0'
+                    php-version: '8.1'
+                    extensions: snappy-kjdev/php-ext-snappy@0.2.1
                 env:
                     update: true
 
@@ -138,7 +140,8 @@ jobs:
             -   name: Setup PHP
                 uses: shivammathur/setup-php@v2
                 with:
-                    php-version: '8.0'
+                    php-version: '8.1'
+                    extensions: snappy-kjdev/php-ext-snappy@0.2.1
                 env:
                     update: true
 
@@ -158,45 +161,3 @@ jobs:
 
             -   name: Run script
                 run: vendor/bin/psalm --output-format=github
-
-    infection:
-        name: Infection
-        runs-on: ubuntu-latest
-        services:
-            nsqd:
-                image: nsqio/nsq:v1.2.0
-                options: --entrypoint /nsqd
-                ports:
-                    - 4150:4150
-        steps:
-            -   name: Checkout
-                uses: actions/checkout@v2
-
-            -   name: Setup PHP
-                uses: shivammathur/setup-php@v2
-                with:
-                    php-version: '8.0'
-                    coverage: pcov
-                env:
-                    update: true
-
-            -   name: Get composer cache directory
-                id: composer-cache
-                run: echo "::set-output name=dir::$(composer config cache-files-dir)"
-
-            -   name: Cache dependencies
-                uses: actions/cache@v2
-                with:
-                    path: ${{ steps.composer-cache.outputs.dir }}
-                    key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.json') }}
-                    restore-keys: ${{ runner.os }}-composer-
-
-            -   name: Install dependencies
-                run: composer update --no-progress --no-interaction --prefer-dist
-
-            -   name: Run script
-                env:
-                    STRYKER_DASHBOARD_API_KEY: ${{ secrets.STRYKER_DASHBOARD_API_KEY }}
-                run: |
-                    git fetch --depth=1 origin $GITHUB_BASE_REF
-                    php vendor/bin/infection -j2 --git-diff-filter=A --git-diff-base=origin/$GITHUB_BASE_REF --logger-github --ignore-msi-with-no-mutations --only-covered

.gitignore

@@ -1,6 +1,6 @@
 /vendor/
 /composer.lock
 
-/.php_cs.cache
+/.php-cs-fixer.cache
 /.phpunit.result.cache
 /infection.log

.php-cs-fixer.php

@@ -0,0 +1,45 @@
+<?php
+
+$finder = PhpCsFixer\Finder::create()
+    ->in(__DIR__)
+    ->exclude('vendor');
+
+return (new PhpCsFixer\Config())
+    ->setRiskyAllowed(true)
+    ->setRules([
+        '@PhpCsFixer' => true,
+        '@PhpCsFixer:risky' => true,
+        '@PSR12' => true,
+        '@PSR12:risky' => true,
+        'blank_line_before_statement' => [
+            'statements' => [
+                'continue',
+                'do',
+                'exit',
+                'goto',
+                'if',
+                'return',
+                'switch',
+                'throw',
+                'try',
+            ],
+        ],
+        'declare_strict_types' => true,
+        'global_namespace_import' => [
+            'import_classes' => false,
+            'import_constants' => false,
+            'import_functions' => false,
+        ],
+        'php_unit_internal_class' => false,
+        'php_unit_test_case_static_method_calls' => ['call_type' => 'self'],
+        'php_unit_test_class_requires_covers' => false,
+        'phpdoc_to_comment' => false,
+        'yoda_style' => true,
+        'trailing_comma_in_multiline' => [
+            'after_heredoc' => true,
+            'elements' => ['arrays', 'arguments', 'parameters'],
+        ],
+        'types_spaces' => ['space' => 'single'],
+    ])
+    ->setFinder($finder)
+    ->setCacheFile(__DIR__.'/.php-cs-fixer.cache');

.php_cs.dist

@@ -1,23 +0,0 @@
-#!/usr/bin/env php
-<?php
-
-return (new PhpCsFixer\Config())
-    ->setRiskyAllowed(true)
-    ->setRules([
-        '@PhpCsFixer' => true,
-        '@PhpCsFixer:risky' => true,
-        '@PSR12' => true,
-        '@PSR12:risky' => true,
-        'declare_strict_types' => true,
-        'php_unit_internal_class' => false,
-        'php_unit_test_class_requires_covers' => false,
-        'yoda_style' => true,
-        'php_unit_test_case_static_method_calls'=> ['call_type' => 'self'],
-        'blank_line_before_statement' => [
-            'statements' => ['continue', 'do', 'die', 'exit', 'goto', 'if', 'return', 'switch', 'throw', 'try']
-        ],
-    ])
-    ->setFinder(
-        PhpCsFixer\Finder::create()
-            ->in(__DIR__)
-    );

Makefile

@@ -0,0 +1,20 @@
+
+all: install composer-validate php-cs-fixer psalm phpstan phpunit
+
+install:
+	composer install
+
+psalm:
+	php vendor/bin/psalm
+
+phpstan:
+	php vendor/bin/phpstan analyse
+
+phpunit:
+	php vendor/bin/phpunit
+
+php-cs-fixer:
+	php vendor/bin/php-cs-fixer fix
+
+composer-validate:
+	composer validate

README.md

@@ -1,6 +1,6 @@
 # Nsq PHP
 
-<img src="https://github.com/nsqphp/nsqphp/raw/main/logo.png" alt="" align="left" width="150">
+<img src="https://github.com/nsqphp/nsqphp/raw/main/docs/logo.png" alt="" align="left" width="150">
 
 PHP Client for [NSQ](https://nsq.io/).
 
@@ -31,67 +31,75 @@ Features
 - [x] PUB
 - [x] SUB
 - [X] Feature Negotiation	
-- [ ] Discovery	
+- [X] Discovery	
 - [ ] Backoff	
-- [ ] TLS	
-- [ ] Snappy	
+- [X] TLS	
+- [X] Deflate	
+- [X] Snappy	
 - [X] Sampling	
 - [X] AUTH
 
 Usage
 -----
 
-### Publish
+### Producer
 
 ```php
 use Nsq\Producer;
 
-$producer = new Producer(address: 'tcp://nsqd:4150');
+$producer = Producer::create(address: 'tcp://nsqd:4150');
 
 // Publish a message to a topic
-$producer->pub('topic', 'Simple message');
+$producer->publish('topic', 'Simple message');
 
 // Publish multiple messages to a topic (atomically) 
-$producer->mpub('topic', [
+$producer->publish('topic', [
     'Message one',
     'Message two',
 ]);
 
 // Publish a deferred message to a topic
-$producer->dpub('topic', 'Deferred message', delay: 5000);
+$producer->publish('topic', 'Deferred message', delay: 5000);
 ```
 
-### Subscription
+### Consumer
 
 ```php
 use Nsq\Consumer;
 use Nsq\Message;
-use Nsq\Subscriber;
 
-$consumer = new Consumer('tcp://nsqd:4150');
-$subscriber = new Subscriber($consumer);
+$consumer = Consumer::create(
+    address: 'tcp://nsqd:4150', 
+    topic: 'topic',
+    channel: 'channel',
+    onMessage: static function (Message $message): Generator {
+        yield $message->touch(); // Reset the timeout for an in-flight message        
+        yield $message->requeue(timeout: 5000); // Re-queue a message (indicate failure to process)        
+        yield $message->finish(); // Finish a message (indicate successful processing)        
+    },
+);
+```
 
-$generator = $subscriber->subscribe('topic', 'channel');
-foreach ($generator as $message) {
-    if ($message instanceof Message) {
-        $payload = $message->body;
+### Lookup
 
-        // handle message
+```php
+use Nsq\Lookup;
+use Nsq\Message;
 
-        $message->touch(); // Reset the timeout for an in-flight message        
-        $message->requeue(timeout: 5000); // Re-queue a message (indicate failure to process)        
-        $message->finish(); // Finish a message (indicate successful processing)        
-    }
+$lookup = new Lookup('http://nsqlookupd0:4161');
+$lookup = new Lookup(['http://nsqlookupd0:4161', 'http://nsqlookupd1:4161', 'http://nsqlookupd2:4161']);
 
-    // In case of nothing received during timeout generator will return NULL
-    // Here we can do something between messages, like pcntl_signal_dispatch()
+$callable = static function (Message $message): Generator {
+    yield $message->touch(); // Reset the timeout for an in-flight message        
+    yield $message->requeue(timeout: 5000); // Re-queue a message (indicate failure to process)        
+    yield $message->finish(); // Finish a message (indicate successful processing)        
+};
 
-    // We can also communicate with generator through send
-    // for example:
+$lookup->subscribe(topic: 'topic', channel: 'channel', onMessage: $callable);  
+$lookup->subscribe(topic: 'anotherTopic', channel: 'channel', onMessage: $callable);
 
-    // Gracefully close connection (loop will be ended)
-    $generator->send(Subscriber::STOP); 
-}
+$lookup->unsubscribe(topic: 'local', channel: 'channel');
+$lookup->stop(); // unsubscribe all  
 ```
 
 ### Integrations

composer.json

@@ -11,38 +11,49 @@
         }
     ],
     "require": {
-        "php": "^8.0.1",
+        "php": "^8.1",
         "ext-json": "*",
-        "clue/socket-raw": "^1.5",
+        "amphp/http-client": "^4.6",
+        "amphp/socket": "^1.1",
         "composer/semver": "^3.2",
         "phpinnacle/buffer": "^1.2",
-        "psr/log": "^1.1"
+        "psr/log": "^3.0"
     },
     "require-dev": {
+        "amphp/log": "^1.1",
         "dg/bypass-finals": "^1.3",
-        "ergebnis/composer-normalize": "9999999-dev",
-        "friendsofphp/php-cs-fixer": "^2.18",
-        "infection/infection": "^0.20.2",
+        "ergebnis/composer-normalize": "^2.15",
+        "friendsofphp/php-cs-fixer": "^3.4",
         "nyholm/nsa": "^1.2",
-        "phpstan/phpstan": "^0.12.68",
-        "phpstan/phpstan-phpunit": "^0.12.17",
-        "phpstan/phpstan-strict-rules": "^0.12.9",
+        "phpstan/phpstan": "^1.8",
+        "phpstan/phpstan-phpunit": "^1.1",
+        "phpstan/phpstan-strict-rules": "^1.3",
         "phpunit/phpunit": "^9.5",
+        "symfony/var-dumper": "^6.1",
         "vimeo/psalm": "^4.4"
     },
     "config": {
-        "sort-packages": true
+        "sort-packages": true,
+        "allow-plugins": {
+            "ergebnis/composer-normalize": true,
+            "infection/extension-installer": true
+        }
     },
     "autoload": {
         "psr-4": {
             "Nsq\\": "src/"
         }
     },
+    "autoload-dev": {
+        "files": [
+            "vendor/symfony/var-dumper/Resources/functions/dump.php"
+        ]
+    },
     "minimum-stability": "dev",
     "prefer-stable": true,
     "scripts": {
         "cs": [
-            "vendor/bin/php-cs-fixer fix"
+            "vendor/bin/php-cs-fixer fix --using-cache=no"
         ],
         "cs-check": [
             "vendor/bin/php-cs-fixer fix --verbose --diff --dry-run"
@@ -59,7 +70,7 @@
             "vendor/bin/psalm"
         ],
         "test": [
-            "@norm-check",
+            "@norm",
             "@cs",
             "@phpstan",
             "@psalm",

docker-compose.yml

@@ -2,14 +2,56 @@ version: '3.7'
 
 services:
     nsqd:
-        image: nsqio/nsq:v1.2.0
-        command: /nsqd
-        ports:
-            - 4150:4150
-            - 4151:4151
+        image: nsqio/nsq:v${NSQ_VERSION}
+        labels:
+            ru.grachevko.dhu: 'nsqd'
+        command: >-
+            nsqd
+            --log-level debug
+            --lookupd-tcp-address nsqlookupd0:4160
+            --lookupd-tcp-address nsqlookupd1:4160
+            --lookupd-tcp-address nsqlookupd2:4160
+
+    nsqlookupd0:
+        image: nsqio/nsq:v${NSQ_VERSION}
+        labels:
+            ru.grachevko.dhu: 'nsqlookupd0'
+        command: /nsqlookupd -log-level debug
+
+    nsqlookupd1:
+        image: nsqio/nsq:v${NSQ_VERSION}
+        labels:
+            ru.grachevko.dhu: 'nsqlookupd1'
+        command: /nsqlookupd -log-level debug
+
+    nsqlookupd2:
+        image: nsqio/nsq:v${NSQ_VERSION}
+        labels:
+            ru.grachevko.dhu: 'nsqlookupd2'
+        command: /nsqlookupd -log-level debug
 
     nsqadmin:
-        image: nsqio/nsq:v1.2.0
-        command: /nsqadmin --nsqd-http-address=nsqd:4151 --http-address=0.0.0.0:4171
-        ports:
-            - 4171:4171
+        image: nsqio/nsq:v${NSQ_VERSION}
+        labels:
+            ru.grachevko.dhu: 'nsqadmin'
+        command:
+            - nsqadmin
+            - --http-address=0.0.0.0:4171
+            - --lookupd-http-address=nsqlookupd0:4161
+            - --lookupd-http-address=nsqlookupd1:4161
+            - --lookupd-http-address=nsqlookupd2:4161
+        depends_on:
+            - nsqlookupd0
+            - nsqlookupd1
+            - nsqlookupd2
+
+    tail:
+        image: nsqio/nsq:v${NSQ_VERSION}
+        command: >-
+            nsq_tail
+            --channel nsq_tail
+            --topic local
+            --lookupd-http-address nsqlookupd1:4161
+        depends_on:
+            - nsqd
+            - nsqlookupd1

examples/discovery/consumer.php

@@ -0,0 +1,47 @@
+<?php
+
+declare(strict_types=1);
+
+require dirname(__DIR__).'/../vendor/autoload.php';
+
+use Amp\ByteStream;
+use Amp\Log\ConsoleFormatter;
+use Amp\Log\StreamHandler;
+use Amp\Loop;
+use Monolog\Logger;
+use Monolog\Processor\PsrLogMessageProcessor;
+use Nsq\Config\ClientConfig;
+use Nsq\Config\LookupConfig;
+use Nsq\Lookup;
+use Nsq\Message;
+
+Loop::run(static function () {
+    $handler = new StreamHandler(ByteStream\getStdout());
+    $handler->setFormatter(new ConsoleFormatter());
+    $logger = new Logger('consumer', [$handler], [new PsrLogMessageProcessor()]);
+
+    $callable = static function (Message $message) {
+        yield $message->finish();
+    };
+
+    $clientConfig = new ClientConfig();
+
+    $lookupConfig = new LookupConfig();
+
+    $watcherId = Loop::repeat(5000, function () {
+        yield Amp\Dns\resolver()->reloadConfig();
+    });
+
+    $lookup = Lookup::create(
+        ['http://nsqlookupd0:4161', 'http://nsqlookupd1:4161', 'http://nsqlookupd2:4161'],
+        $lookupConfig,
+        $logger,
+    );
+
+    $lookup->subscribe('local', 'local', $callable, $clientConfig);
+
+    Loop::delay(10000, function () use ($lookup, $watcherId) {
+        $lookup->stop();
+        Loop::cancel($watcherId);
+    });
+});

examples/discovery/producer.php

@@ -0,0 +1,102 @@
+<?php
+
+declare(strict_types=1);
+
+require dirname(__DIR__).'/../vendor/autoload.php';
+
+use Amp\ByteStream;
+use Amp\Log\ConsoleFormatter;
+use Amp\Log\StreamHandler;
+use Amp\Loop;
+use Monolog\Logger;
+use Monolog\Processor\PsrLogMessageProcessor;
+use Nsq\Config\ClientConfig;
+use Nsq\Config\LookupConfig;
+use Nsq\Lookup;
+use Nsq\Producer;
+
+use function Amp\asyncCall;
+use function Amp\delay;
+
+Loop::run(static function () {
+    $handler = new StreamHandler(ByteStream\getStdout());
+    $handler->setFormatter(new ConsoleFormatter());
+    $logger = new Logger('publisher', [$handler], [new PsrLogMessageProcessor()]);
+
+    $clientConfig = new ClientConfig();
+
+    /** @var Producer[] $producers */
+    $producers = [];
+
+    $lookupConfig = new LookupConfig();
+
+    $lookup = Lookup::create(
+        ['http://nsqlookupd0:4161', 'http://nsqlookupd1:4161', 'http://nsqlookupd2:4161'],
+        $lookupConfig,
+        $logger,
+    );
+
+    $isRunning = true;
+
+    asyncCall(static function () use ($lookup, $clientConfig, $logger, &$producers, &$isRunning) {
+        while ($isRunning) {
+            /** @var Lookup\Producer[] $nodes */
+            $nodes = yield $lookup->nodes();
+
+            foreach ($nodes as $node) {
+                $address = $node->toTcpUri();
+
+                if (array_key_exists($address, $producers)) {
+                    continue;
+                }
+
+                asyncCall(function () use ($address, $clientConfig, $logger, &$producers) {
+                    yield ($producers[$address] = Producer::create($address, $clientConfig, $logger))
+                        ->onClose(function () use (&$producers, $address) {
+                            unset($producers[$address]);
+                        })
+                        ->connect()
+                    ;
+                });
+            }
+
+            yield delay(5000);
+
+            yield Amp\Dns\resolver()->reloadConfig(); // for reload /etc/hosts
+        }
+    });
+
+    Loop::delay(5000, function () use (&$isRunning, $logger) {
+        $logger->info('Stopping producer.');
+
+        $isRunning = false;
+    });
+
+    $counter = 0;
+    while (true) {
+        if (!$isRunning) {
+            foreach ($producers as $producer) {
+                $producer->close();
+            }
+
+            break;
+        }
+
+        if ([] === $producers) {
+            yield delay(200);
+
+            continue;
+        }
+
+        $index = array_rand($producers);
+        $producer = $producers[$index];
+
+        if (!$producer->isConnected()) {
+            yield delay(100);
+
+            continue;
+        }
+
+        yield $producer->publish('local', 'This is message of count '.$counter++);
+    }
+});

examples/simple/consumer.php

@@ -0,0 +1,44 @@
+<?php
+
+declare(strict_types=1);
+
+require __DIR__.'/../vendor/autoload.php';
+
+use Amp\ByteStream;
+use Amp\Log\ConsoleFormatter;
+use Amp\Log\StreamHandler;
+use Amp\Loop;
+use Amp\Promise;
+use Monolog\Logger;
+use Monolog\Processor\PsrLogMessageProcessor;
+use Nsq\Config\ClientConfig;
+use Nsq\Consumer;
+use Nsq\Message;
+
+use function Amp\call;
+
+Loop::run(static function () {
+    $handler = new StreamHandler(ByteStream\getStdout());
+    $handler->setFormatter(new ConsoleFormatter());
+    $logger = new Logger('publisher', [$handler], [new PsrLogMessageProcessor()]);
+
+    $consumer = new Consumer(
+        'tcp://localhost:4150',
+        topic: 'local',
+        channel: 'local',
+        onMessage: static function (Message $message) use ($logger): Promise {
+            return call(function () use ($message, $logger): Generator {
+                $logger->info('Received: {body}', ['body' => $message->body]);
+
+                yield $message->finish();
+            });
+        },
+        clientConfig: new ClientConfig(
+            deflate: false,
+            snappy: true,
+        ),
+        logger: $logger,
+    );
+
+    yield $consumer->connect();
+});

examples/simple/producer.php

@@ -0,0 +1,36 @@
+<?php
+
+declare(strict_types=1);
+
+require __DIR__.'/../vendor/autoload.php';
+
+use Amp\ByteStream;
+use Amp\Log\ConsoleFormatter;
+use Amp\Log\StreamHandler;
+use Amp\Loop;
+use Monolog\Logger;
+use Monolog\Processor\PsrLogMessageProcessor;
+use Nsq\Config\ClientConfig;
+use Nsq\Producer;
+
+Loop::run(static function () {
+    $handler = new StreamHandler(ByteStream\getStdout());
+    $handler->setFormatter(new ConsoleFormatter());
+    $logger = new Logger('publisher', [$handler], [new PsrLogMessageProcessor()]);
+
+    $producer = new Producer(
+        'tcp://localhost:4150',
+        clientConfig: new ClientConfig(
+            deflate: false,
+            heartbeatInterval: 5000,
+            snappy: true,
+        ),
+        logger: $logger,
+    );
+
+    yield $producer->connect();
+
+    while (true) {
+        yield $producer->publish(topic: 'local', body: array_fill(0, 200, 'Message body!'));
+    }
+});

phpstan.neon

@@ -8,3 +8,9 @@ parameters:
     paths:
         - src
         - tests
+    ignoreErrors:
+        -
+            message: '#no value type specified in iterable type array#'
+            paths:
+                - %currentWorkingDirectory%/src
+                - %currentWorkingDirectory%/tests

psalm.xml

@@ -1,6 +1,5 @@
 <?xml version="1.0"?>
 <psalm
-        allowPhpStormGenerics="true"
         ignoreInternalFunctionFalseReturn="false"
         ignoreInternalFunctionNullReturn="false"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

src/Buffer.php

@@ -0,0 +1,37 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Nsq;
+
+use PHPinnacle\Buffer\ByteBuffer;
+
+/**
+ * @psalm-suppress
+ */
+final class Buffer extends ByteBuffer
+{
+    public function readUInt32LE(): int
+    {
+        $unpacked = unpack('V', $this->consume(4));
+
+        \assert(\is_array($unpacked) && \array_key_exists(1, $unpacked));
+
+        return $unpacked[1];
+    }
+
+    public function consumeTimestamp(): int
+    {
+        return $this->consumeUint64();
+    }
+
+    public function consumeAttempts(): int
+    {
+        return $this->consumeUint16();
+    }
+
+    public function consumeMessageID(): string
+    {
+        return $this->consume(16);
+    }
+}

src/Command.php

@@ -0,0 +1,111 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Nsq;
+
+use PHPinnacle\Buffer\ByteBuffer;
+
+/**
+ * @internal
+ */
+final class Command
+{
+    public static function magic(): string
+    {
+        return '  V2';
+    }
+
+    public static function identify(string $data): string
+    {
+        return self::pack('IDENTIFY', data: $data);
+    }
+
+    public static function auth(?string $authSecret): string
+    {
+        return self::pack('AUTH', data: $authSecret);
+    }
+
+    public static function nop(): string
+    {
+        return self::pack('NOP');
+    }
+
+    public static function cls(): string
+    {
+        return self::pack('CLS');
+    }
+
+    public static function rdy(int $count): string
+    {
+        return self::pack('RDY', (string) $count);
+    }
+
+    public static function fin(string $id): string
+    {
+        return self::pack('FIN', $id);
+    }
+
+    public static function req(string $id, int $timeout): string
+    {
+        return self::pack('REQ', [$id, $timeout]);
+    }
+
+    public static function touch(string $id): string
+    {
+        return self::pack('TOUCH', $id);
+    }
+
+    public static function pub(string $topic, string $body): string
+    {
+        return self::pack('PUB', $topic, $body);
+    }
+
+    /**
+     * @param array<int, string> $bodies
+     */
+    public static function mpub(string $topic, array $bodies): string
+    {
+        static $buffer;
+        $buffer ??= new ByteBuffer();
+
+        $buffer->appendUint32(\count($bodies));
+
+        foreach ($bodies as $body) {
+            $buffer->appendUint32(\strlen($body));
+            $buffer->append($body);
+        }
+
+        return self::pack('MPUB', $topic, $buffer->flush());
+    }
+
+    public static function dpub(string $topic, string $body, int $delay): string
+    {
+        return self::pack('DPUB', [$topic, $delay], $body);
+    }
+
+    public static function sub(string $topic, string $channel): string
+    {
+        return self::pack('SUB', [$topic, $channel]);
+    }
+
+    /**
+     * @param array<int, scalar>|string $params
+     */
+    private static function pack(string $command, array | string $params = [], string $data = null): string
+    {
+        static $buffer;
+        $buffer ??= new Buffer();
+
+        $command = implode(' ', [$command, ...((array) $params)]);
+
+        $buffer->append($command.PHP_EOL);
+
+        if (null !== $data) {
+            $buffer->appendUint32(\strlen($data));
+            $buffer->append($data);
+        }
+
+        return $buffer->flush();
+    }
+}

src/Config/ClientConfig.php

@@ -5,9 +5,6 @@ declare(strict_types=1);
 namespace Nsq\Config;
 
 use Composer\InstalledVersions;
-use InvalidArgumentException;
-use JsonSerializable;
-use function gethostname;
 
 /**
  * This class is used for configuring the clients for nsq. Immutable properties must be set when creating the object and
@@ -16,25 +13,51 @@ use function gethostname;
  *
  * @psalm-immutable
  */
-final class ClientConfig implements JsonSerializable
+final class ClientConfig
 {
-    /** @psalm-suppress ImpureFunctionCall */
+    /**
+     * @psalm-suppress ImpureFunctionCall
+     */
     public function __construct(
-        /*
+        /**
          * The secret used for authorization, if the server requires it. This value will be ignored if the server
          * does not require authorization.
          */
         public ?string $authSecret = null,
 
-        // The timeout for establishing a connection in seconds.
-        public int $connectTimeout = 10,
+        /**
+         * The timeout for establishing a connection in milliseconds.
+         */
+        public int $connectTimeout = 10000,
 
-        // An identifier used to disambiguate this client (i.e. something specific to the consumer)
+        /**
+         * The max attempts for establishing a connection.
+         */
+        public int $maxAttempts = 0,
+
+        /**
+         * Use tcp_nodelay for establishing a connection.
+         */
+        public bool $tcpNoDelay = false,
+        public int $rdyCount = 100,
+
+        /**
+         * Boolean used to indicate that the client supports feature negotiation. If the server is capable,
+         * it will send back a JSON payload of supported features and metadata.
+         */
+        public bool $featureNegotiation = true,
+
+        /**
+         * An identifier used to disambiguate this client (i.e. something specific to the consumer).
+         */
         public string $clientId = '',
 
-        // Enable deflate compression for this connection. A client cannot enable both [snappy] and [deflate].
+        /**
+         * Enable deflate compression for this connection. A client cannot enable both [snappy] and [deflate].
+         */
         public bool $deflate = false,
-        /*
+
+        /**
          * Configure the deflate compression level for this connection.
          *
          * Valid range: `1 <= deflate_level <= configured_max`
@@ -43,42 +66,43 @@ final class ClientConfig implements JsonSerializable
          */
         public int $deflateLevel = 6,
 
-        /*
+        /**
          * Milliseconds between heartbeats.
          *
          * Valid range: `1000 <= heartbeat_interval <= configured_max` (`-1` disables heartbeats)
          */
         public int $heartbeatInterval = 30000,
 
-        // The hostname where the client is deployed
+        /**
+         * The hostname where the client is deployed.
+         */
         public string $hostname = '',
 
-        // Configure the server-side message timeout in milliseconds for messages delivered to this client.
+        /**
+         * Configure the server-side message timeout in milliseconds for messages delivered to this client.
+         */
         public int $msgTimeout = 60000,
 
-        /*
+        /**
          * The sample rate for incoming data to deliver a percentage of all messages received to this connection.
          * This only applies to subscribing connections. The valid range is between 0 and 99, where 0 means that all
          * data is sent (this is the default). 1 means that 1% of the data is sent.
          */
         public int $sampleRate = 0,
 
-        /*
-         * Boolean used to indicate that the client supports feature negotiation. If the server is capable,
-         * it will send back a JSON payload of supported features and metadata.
+        /**
+         * Enable TLS for this connection.
          */
-        public bool $featureNegotiation = true,
-
-        // Enable TLS for this connection
         public bool $tls = false,
 
-        // Enable snappy compression for this connection. A client cannot enable both [snappy] and [deflate].
+        /**
+         * Enable snappy compression for this connection. A client cannot enable both [snappy] and [deflate].
+         */
         public bool $snappy = false,
 
-        // The read timeout for connection sockets and for awaiting responses from nsq.
-        public int $readTimeout = 5,
-
-        // A string identifying the agent for this client in the spirit of HTTP.
+        /**
+         * A string identifying the agent for this client in the spirit of HTTP.
+         */
         public string $userAgent = '',
     ) {
         $this->featureNegotiation = true; // Always enabled
@@ -92,16 +116,18 @@ final class ClientConfig implements JsonSerializable
         }
 
         if ($this->snappy && $this->deflate) {
-            throw new InvalidArgumentException('Client cannot enable both [snappy] and [deflate]');
+            throw new \InvalidArgumentException('Client cannot enable both [snappy] and [deflate]');
         }
     }
 
-    /**
-     * @phpstan-ignore-next-line
-     */
-    public function jsonSerialize(): array
+    public static function fromArray(array $array): self
     {
-        return [
+        return new self(...array_intersect_key($array, get_class_vars(self::class)));
+    }
+
+    public function asNegotiationPayload(): string
+    {
+        $data = [
             'client_id' => $this->clientId,
             'deflate' => $this->deflate,
             'deflate_level' => $this->deflateLevel,
@@ -114,5 +140,7 @@ final class ClientConfig implements JsonSerializable
             'tls_v1' => $this->tls,
             'user_agent' => $this->userAgent,
         ];
+
+        return json_encode($data, JSON_THROW_ON_ERROR);
     }
 }

src/Config/LookupConfig.php

@@ -0,0 +1,13 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Nsq\Config;
+
+final class LookupConfig
+{
+    public function __construct(
+        public int $pollingInterval = 10000,
+    ) {
+    }
+}

src/Config/ServerConfig.php

@@ -8,58 +8,82 @@ namespace Nsq\Config;
  * The configuration object that holds the config status for a single Connection.
  *
  * @psalm-immutable
+ *
+ * @internal
  */
-final class ConnectionConfig
+final class ServerConfig
 {
     public function __construct(
-        // Whether or not authorization is required by nsqd.
+        /**
+         * Whether or not authorization is required by nsqd.
+         */
         public bool $authRequired,
 
-        // Whether deflate compression is enabled for this connection or not.
+        /**
+         * Whether deflate compression is enabled for this connection or not.
+         */
         public bool $deflate,
-        // The deflate level. This value can be ignored if [deflate] is `false`.
+
+        /**
+         * The deflate level. This value can be ignored if [deflate] is `false`.
+         */
         public int $deflateLevel,
 
-        // The maximum deflate level supported by the server.
+        /**
+         * The maximum deflate level supported by the server.
+         */
         public int $maxDeflateLevel,
 
-        // The maximum value for message timeout.
+        /**
+         * The maximum value for message timeout.
+         */
         public int $maxMsgTimeout,
-        /*
+
+        /**
          * Each nsqd is configurable with a max-rdy-count. If the consumer sends a RDY count that is outside
          * of the acceptable range its connection will be forcefully closed.
          */
         public int $maxRdyCount,
 
-        // The effective message timeout.
+        /**
+         * The effective message timeout.
+         */
         public int $msgTimeout,
 
-        // The size in bytes of the buffer nsqd will use when writing to this client.
+        /**
+         * The size in bytes of the buffer nsqd will use when writing to this client.
+         */
         public int $outputBufferSize,
-        // The timeout after which any data that nsqd has buffered will be flushed to this client.
+
+        /**
+         * The timeout after which any data that nsqd has buffered will be flushed to this client.
+         */
         public int $outputBufferTimeout,
 
-        /*
+        /**
          * The sample rate for incoming data to deliver a percentage of all messages received to this connection.
          * This only applies to subscribing connections. The valid range is between 0 and 99, where 0 means that all
          * data is sent (this is the default). 1 means that 1% of the data is sent.
          */
         public int $sampleRate,
 
-        // Whether snappy compression is enabled for this connection or not.
+        /**
+         * Whether snappy compression is enabled for this connection or not.
+         */
         public bool $snappy,
 
-        // Whether TLS is enabled for this connection or not.
+        /**
+         * Whether TLS is enabled for this connection or not.
+         */
         public bool $tls,
 
-        // The nsqd version.
+        /**
+         * The nsqd version.
+         */
         public string $version,
     ) {
     }
 
-    /**
-     * @phpstan-ignore-next-line
-     */
     public static function fromArray(array $array): self
     {
         return new self(

src/Connection.php

@@ -4,240 +4,266 @@ declare(strict_types=1);
 
 namespace Nsq;
 
+use Amp\ByteStream\ClosedException;
+use Amp\Failure;
+use Amp\Promise;
 use Nsq\Config\ClientConfig;
-use Nsq\Config\ConnectionConfig;
+use Nsq\Config\ServerConfig;
 use Nsq\Exception\AuthenticationRequired;
-use Nsq\Exception\ConnectionFail;
-use Nsq\Exception\UnexpectedResponse;
-use Nsq\Reconnect\ExponentialStrategy;
-use Nsq\Reconnect\ReconnectStrategy;
-use PHPinnacle\Buffer\ByteBuffer;
-use Psr\Log\LoggerAwareTrait;
+use Nsq\Exception\NsqException;
+use Nsq\Frame\Response;
+use Nsq\Stream\GzipStream;
+use Nsq\Stream\NullStream;
+use Nsq\Stream\SnappyStream;
+use Nsq\Stream\SocketStream;
 use Psr\Log\LoggerInterface;
-use Psr\Log\NullLogger;
-use Socket\Raw\Exception;
-use Socket\Raw\Factory;
-use Socket\Raw\Socket;
-use function addcslashes;
-use function http_build_query;
-use function implode;
-use function json_encode;
-use function pack;
-use const JSON_FORCE_OBJECT;
-use const JSON_THROW_ON_ERROR;
-use const PHP_EOL;
+
+use function Amp\asyncCall;
+use function Amp\call;
 
 /**
  * @internal
- *
- * @property ConnectionConfig $connectionConfig
  */
 abstract class Connection
 {
-    use LoggerAwareTrait;
+    private Stream $stream;
 
-    private string $address;
+    /**
+     * @var callable
+     */
+    private $onConnectCallback;
 
-    private ?Socket $socket = null;
-
-    private ReconnectStrategy $reconnect;
-
-    private ClientConfig $clientConfig;
-
-    private ?ConnectionConfig $connectionConfig = null;
+    /**
+     * @var callable
+     */
+    private $onCloseCallback;
 
     public function __construct(
-        string $address,
-        ClientConfig $clientConfig = null,
-        ReconnectStrategy $reconnectStrategy = null,
-        LoggerInterface $logger = null,
+        /**
+         * @readonly
+         */
+        public string $address,
+        protected ClientConfig $clientConfig,
+        protected LoggerInterface $logger,
     ) {
-        $this->address = $address;
-
-        $this->logger = $logger ?? new NullLogger();
-        $this->reconnect = $reconnectStrategy ?? new ExponentialStrategy(logger: $this->logger);
-        $this->clientConfig = $clientConfig ?? new ClientConfig();
+        $this->stream = new NullStream();
+        $this->onConnectCallback = static function (): void {
+        };
+        $this->onCloseCallback = static function (): void {
+        };
     }
 
-    public function connect(): void
+    public function __destruct()
     {
-        $this->reconnect->connect(function (): void {
-            try {
-                $this->socket = (new Factory())->createClient($this->address);
-            }
-            // @codeCoverageIgnoreStart
-            catch (Exception $e) {
-                $this->logger->error('Connecting to {address} failed.', ['address' => $this->address]);
+        $this->close(false);
+    }
 
-                throw ConnectionFail::fromThrowable($e);
-            }
-            // @codeCoverageIgnoreEnd
+    public function isConnected(): bool
+    {
+        return !$this->stream instanceof NullStream;
+    }
 
-            $this->socket->write('  V2');
+    /**
+     * @psalm-return Promise<void>
+     */
+    public function connect(): Promise
+    {
+        return call(function (): \Generator {
+            $buffer = new Buffer();
 
-            $body = json_encode($this->clientConfig, JSON_THROW_ON_ERROR | JSON_FORCE_OBJECT);
+            /** @var SocketStream $stream */
+            $stream = yield SocketStream::connect(
+                $this->address,
+                $this->clientConfig->connectTimeout,
+                $this->clientConfig->maxAttempts,
+                $this->clientConfig->tcpNoDelay,
+            );
 
-            $response = $this->command('IDENTIFY', data: $body)->response();
+            yield $stream->write(Command::magic());
+            yield $stream->write(Command::identify($this->clientConfig->asNegotiationPayload()));
 
-            $this->connectionConfig = ConnectionConfig::fromArray($response->toArray());
+            /** @var Response $response */
+            $response = yield $this->response($stream, $buffer);
+            $serverConfig = ServerConfig::fromArray($response->toArray());
 
-            if ($this->connectionConfig->snappy || $this->connectionConfig->deflate) {
-                $this->response()->okOrFail();
+            if ($serverConfig->tls) {
+                yield $stream->setupTls();
+
+                /** @var Response $response */
+                $response = yield $this->response($stream, $buffer);
+
+                if (!$response->isOk()) {
+                    throw new NsqException();
+                }
             }
 
-            if ($this->connectionConfig->authRequired) {
+            if ($serverConfig->snappy) {
+                $stream = new SnappyStream($stream, $buffer->flush());
+
+                /** @var Response $response */
+                $response = yield $this->response($stream, $buffer);
+
+                if (!$response->isOk()) {
+                    throw new NsqException();
+                }
+            }
+
+            if ($serverConfig->deflate) {
+                $stream = new GzipStream($stream, $serverConfig->deflateLevel, $buffer->flush());
+
+                /** @var Response $response */
+                $response = yield $this->response($stream, $buffer);
+
+                if (!$response->isOk()) {
+                    throw new NsqException();
+                }
+            }
+
+            if ($serverConfig->authRequired) {
                 if (null === $this->clientConfig->authSecret) {
-                    throw new AuthenticationRequired('NSQ requires authorization, set ClientConfig::$authSecret before connecting');
+                    throw new AuthenticationRequired();
                 }
 
-                $authResponse = $this->command('AUTH', data: $this->clientConfig->authSecret)->response()->toArray();
+                yield $stream->write(Command::auth($this->clientConfig->authSecret));
 
-                $this->logger->info('Authorization response: '.http_build_query($authResponse));
+                /** @var Response $response */
+                $response = yield $this->response($stream, $buffer);
+
+                $this->logger->info('Authorization response: '.http_build_query($response->toArray()));
+            }
+
+            $this->stream = $stream;
+
+            ($this->onConnectCallback)();
+        });
+    }
+
+    public function close(bool $graceful = true): void
+    {
+        if (!$this->isConnected()) {
+            return;
+        }
+
+        $logger = $this->logger;
+        [$stream, $this->stream] = [$this->stream, new NullStream()];
+
+        if ($graceful) {
+            $this->logger->debug('Graceful disconnect.', [
+                'class' => static::class,
+                'address' => $this->address,
+            ]);
+
+            asyncCall(static function () use ($stream, $logger): \Generator {
+                try {
+                    yield $stream->write(Command::cls());
+                } catch (\Throwable $e) {
+                    $logger->warning($e->getMessage(), ['exception' => $e]);
+                }
+
+                $stream->close();
+            });
+
+            return;
+        }
+
+        try {
+            $stream->close();
+        } catch (ClosedException) {
+        }
+
+        ($this->onCloseCallback)();
+    }
+
+    public function onConnect(callable $callback): static
+    {
+        $previous = $this->onConnectCallback;
+        $this->onConnectCallback = static function () use ($previous, $callback): void {
+            $previous();
+            $callback();
+        };
+
+        return $this;
+    }
+
+    public function onClose(callable $callback): static
+    {
+        $previous = $this->onCloseCallback;
+        $this->onCloseCallback = static function () use ($previous, $callback): void {
+            $previous();
+            $callback();
+        };
+
+        return $this;
+    }
+
+    /**
+     * @psalm-return Promise<null|string>
+     */
+    protected function read(): Promise
+    {
+        return call(function (): \Generator {
+            try {
+                return yield $this->stream->read();
+            } catch (\Throwable $e) {
+                $this->logger->error($e->getMessage(), ['exception' => $e]);
+
+                $this->close(false);
+
+                return new Failure($e);
             }
         });
     }
 
     /**
-     * Cleanly close your connection (no more messages are sent).
+     * @psalm-return Promise<void>
      */
-    public function disconnect(): void
+    protected function write(string $data): Promise
     {
-        if (null === $this->socket) {
-            return;
-        }
+        return call(function () use ($data): \Generator {
+            try {
+                return yield $this->stream->write($data);
+            } catch (\Throwable $e) {
+                $this->logger->error($e->getMessage(), ['exception' => $e]);
 
-        try {
-            $this->socket->write('CLS'.PHP_EOL);
-            $this->socket->close();
-        }
-        // @codeCoverageIgnoreStart
-        catch (Exception $e) {
-            $this->logger->debug($e->getMessage(), ['exception' => $e]);
-        }
-        // @codeCoverageIgnoreEnd
+                $this->close(false);
 
-        $this->socket = null;
-        $this->connectionConfig = null;
+                return new Failure($e);
+            }
+        });
     }
 
-    public function isReady(): bool
+    protected function handleError(Frame\Error $error): void
     {
-        return null !== $this->socket;
+        $this->logger->error($error->data);
+
+        if (ErrorType::terminable($error)) {
+            $this->close();
+
+            throw $error->toException();
+        }
     }
 
     /**
-     * @param array<int, int|string>|string $params
+     * @psalm-return Promise<Frame\Response>
      */
-    protected function command(string $command, array | string $params = [], string $data = null): self
+    private function response(Stream $stream, Buffer $buffer): Promise
     {
-        $socket = $this->socket();
+        return call(function () use ($stream, $buffer): \Generator {
+            while (true) {
+                $response = Parser::parse($buffer);
 
-        $buffer = [] === $params ? $command : implode(' ', [$command, ...((array) $params)]);
-        $buffer .= PHP_EOL;
+                if (null === $response && null !== ($chunk = yield $stream->read())) {
+                    $buffer->append($chunk);
 
-        if (null !== $data) {
-            $buffer .= pack('N', \strlen($data));
-            $buffer .= $data;
-        }
+                    continue;
+                }
 
-        $this->logger->debug('Send buffer: '.addcslashes($buffer, PHP_EOL));
+                if (!$response instanceof Frame\Response) {
+                    throw new NsqException();
+                }
 
-        try {
-            $socket->write($buffer);
-        }
-        // @codeCoverageIgnoreStart
-        catch (Exception $e) {
-            $this->disconnect();
-
-            $this->logger->error($e->getMessage(), ['exception' => $e]);
-
-            throw ConnectionFail::fromThrowable($e);
-        }
-        // @codeCoverageIgnoreEnd
-        return $this;
-    }
-
-    public function hasMessage(float $timeout = 0): bool
-    {
-        try {
-            return false !== $this->socket()->selectRead($timeout);
-        }
-        // @codeCoverageIgnoreStart
-        catch (Exception $e) {
-            $this->disconnect();
-
-            throw ConnectionFail::fromThrowable($e);
-        }
-        // @codeCoverageIgnoreEnd
-    }
-
-    public function receive(float $timeout = null): ?Response
-    {
-        $socket = $this->socket();
-
-        $timeout ??= $this->clientConfig->readTimeout;
-        $deadline = microtime(true) + $timeout;
-
-        if (!$this->hasMessage($timeout)) {
-            return null;
-        }
-
-        try {
-            $size = $socket->read(Bytes::BYTES_SIZE);
-
-            if ('' === $size) {
-                $this->disconnect();
-
-                throw new ConnectionFail('Probably connection lost');
+                return $response;
             }
-
-            $buffer = new ByteBuffer();
-
-            /** @phpstan-ignore-next-line */
-            $size = unpack('N', $size)[1];
-
-            do {
-                $chunk = $socket->read($size);
-
-                $buffer->append($chunk);
-
-                $size -= \strlen($chunk);
-            } while (0 < $size);
-
-            $this->logger->debug('Received buffer: '.addcslashes($buffer->bytes(), PHP_EOL));
-
-            $response = new Response($buffer);
-
-            if ($response->isHeartBeat()) {
-                $this->command('NOP');
-
-                return $this->receive(
-                    ($currentTime = microtime(true)) > $deadline ? 0 : $deadline - $currentTime
-                );
-            }
-        }
-        // @codeCoverageIgnoreStart
-        catch (Exception $e) {
-            $this->disconnect();
-
-            throw ConnectionFail::fromThrowable($e);
-        }
-        // @codeCoverageIgnoreEnd
-
-        return $response;
-    }
-
-    protected function response(): Response
-    {
-        return $this->receive() ?? throw UnexpectedResponse::null();
-    }
-
-    private function socket(): Socket
-    {
-        if (null === $this->socket) {
-            $this->connect();
-        }
-
-        return $this->socket ?? throw new ConnectionFail('This connection is closed, create new one.');
+        });
     }
 }

src/Consumer.php

@@ -4,60 +4,245 @@ declare(strict_types=1);
 
 namespace Nsq;
 
+use Amp\Failure;
+use Amp\Promise;
+use Amp\Success;
+use Nsq\Config\ClientConfig;
+use Nsq\Exception\ConsumerException;
+use Nsq\Frame\Response;
+use Psr\Log\LoggerInterface;
+use Psr\Log\NullLogger;
+
+use function Amp\asyncCall;
+use function Amp\call;
+
+/**
+ * @internal
+ */
 final class Consumer extends Connection
 {
     private int $rdy = 0;
 
     /**
-     * Subscribe to a topic/channel.
+     * @var callable
      */
-    public function sub(string $topic, string $channel): void
+    private $onMessage;
+
+    public function __construct(
+        string $address,
+        /**
+         * @readonly
+         */
+        public string $topic,
+        /**
+         * @readonly
+         */
+        public string $channel,
+        callable $onMessage,
+        ClientConfig $clientConfig,
+        LoggerInterface $logger,
+    ) {
+        parent::__construct(
+            $address,
+            $clientConfig,
+            $logger,
+        );
+
+        $this->onMessage = $onMessage;
+
+        $context = compact('address', 'topic', 'channel');
+        $this->onConnect(function () use ($context): void {
+            $this->logger->debug('Consumer connected.', $context);
+        });
+        $this->onClose(function () use ($context): void {
+            $this->logger->debug('Consumer disconnected.', $context);
+        });
+        $this->logger->debug('Consumer created.', $context);
+    }
+
+    public static function create(
+        string $address,
+        string $topic,
+        string $channel,
+        callable $onMessage,
+        ?ClientConfig $clientConfig = null,
+        ?LoggerInterface $logger = null,
+    ): self {
+        return new self(
+            $address,
+            $topic,
+            $channel,
+            $onMessage,
+            $clientConfig ?? new ClientConfig(),
+            $logger ?? new NullLogger(),
+        );
+    }
+
+    public function connect(): Promise
     {
-        $this->command('SUB', [$topic, $channel])->response()->okOrFail();
+        if ($this->isConnected()) {
+            return call(static function (): void {
+            });
+        }
+
+        return call(function (): \Generator {
+            yield parent::connect();
+
+            $buffer = new Buffer();
+
+            asyncCall(function () use ($buffer): \Generator {
+                yield $this->write(Command::sub($this->topic, $this->channel));
+
+                if (null !== ($chunk = yield $this->read())) {
+                    $buffer->append($chunk);
+                }
+
+                /** @var Response $response */
+                $response = Parser::parse($buffer);
+
+                if (!$response->isOk()) {
+                    return new Failure(new ConsumerException('Fail subscription.'));
+                }
+
+                yield $this->rdy(1);
+
+                /** @phpstan-ignore-next-line */
+                asyncCall(function () use ($buffer): \Generator {
+                    while (null !== $chunk = yield $this->read()) {
+                        $buffer->append($chunk);
+
+                        while ($frame = Parser::parse($buffer)) {
+                            switch (true) {
+                                case $frame instanceof Frame\Response:
+                                    if ($frame->isHeartBeat()) {
+                                        yield $this->write(Command::nop());
+
+                                        break;
+                                    }
+
+                                    throw ConsumerException::response($frame);
+                                case $frame instanceof Frame\Error:
+                                    $this->handleError($frame);
+
+                                    break;
+                                case $frame instanceof Frame\Message:
+                                    asyncCall($this->onMessage, Message::compose($frame, $this));
+
+                                    break;
+                            }
+
+                            if ($this->rdy !== $this->clientConfig->rdyCount) {
+                                yield $this->rdy($this->clientConfig->rdyCount);
+                            }
+                        }
+                    }
+
+                    $this->close(false);
+                });
+            });
+        });
     }
 
     /**
      * Update RDY state (indicate you are ready to receive N messages).
+     *
+     * @psalm-return Promise<bool>
      */
-    public function rdy(int $count): void
+    public function rdy(int $count): Promise
     {
-        if ($this->rdy === $count) {
-            return;
+        if (!$this->isConnected()) {
+            return new Success(false);
         }
 
-        $this->command('RDY', (string) $count);
+        if ($this->rdy === $count) {
+            return new Success(true);
+        }
 
         $this->rdy = $count;
+
+        return call(function () use ($count): \Generator {
+            try {
+                yield $this->write(Command::rdy($count));
+
+                return true;
+            } catch (\Throwable) {
+                return false;
+            }
+        });
     }
 
     /**
      * Finish a message (indicate successful processing).
+     *
+     * @psalm-return Promise<bool>
+     *
+     * @internal
      */
-    public function fin(string $id): void
+    public function fin(string $id): Promise
     {
-        $this->command('FIN', $id);
+        if (!$this->isConnected()) {
+            return new Success(false);
+        }
 
-        --$this->rdy;
+        return call(function () use ($id): \Generator {
+            try {
+                yield $this->write(Command::fin($id));
+
+                return true;
+            } catch (\Throwable) {
+                return false;
+            }
+        });
     }
 
     /**
-     * Re-queue a message (indicate failure to process)
-     * The re-queued message is placed at the tail of the queue, equivalent to having just published it,
-     * but for various implementation specific reasons that behavior should not be explicitly relied upon and may change in the future.
-     * Similarly, a message that is in-flight and times out behaves identically to an explicit REQ.
+     * Re-queue a message (indicate failure to process) The re-queued message is placed at the tail of the queue,
+     * equivalent to having just published it, but for various implementation specific reasons that behavior should not
+     * be explicitly relied upon and may change in the future. Similarly, a message that is in-flight and times out
+     * behaves identically to an explicit REQ.
+     *
+     * @psalm-return Promise<bool>
+     *
+     * @internal
      */
-    public function req(string $id, int $timeout): void
+    public function req(string $id, int $timeout): Promise
     {
-        $this->command('REQ', [$id, $timeout]);
+        if (!$this->isConnected()) {
+            return new Success(false);
+        }
 
-        --$this->rdy;
+        return call(function () use ($id, $timeout): \Generator {
+            try {
+                yield $this->write(Command::req($id, $timeout));
+
+                return true;
+            } catch (\Throwable) {
+                return false;
+            }
+        });
     }
 
     /**
      * Reset the timeout for an in-flight message.
+     *
+     * @psalm-return Promise<bool>
+     *
+     * @internal
      */
-    public function touch(string $id): void
+    public function touch(string $id): Promise
     {
-        $this->command('TOUCH', $id);
+        if (!$this->isConnected()) {
+            return new Success(false);
+        }
+
+        return call(function () use ($id): \Generator {
+            try {
+                yield $this->write(Command::touch($id));
+
+                return true;
+            } catch (\Throwable) {
+                return false;
+            }
+        });
     }
 }

src/ErrorType.php

@@ -0,0 +1,99 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Nsq;
+
+/**
+ * @psalm-immutable
+ */
+final class ErrorType
+{
+    /**
+     * A generic error type without any more hints.
+     */
+    public const E_INVALID = true;
+    /**
+     * This error might be returned during multiple occasions. It can be returned for IDENTIFY, AUTH or MPUB messages.
+     * It is caused for payloads that do not meet certain requirements. For IDENTIFY and AUTH, this is usually a bug in
+     * the library and should be reported. For MPUB, this error can occur if the payload is larger than the maximum
+     * payload size specified in the nsqd config.
+     */
+    public const E_BAD_BODY = true;
+    /**
+     * This error indicates that the topic sent to nsqd is not valid.
+     */
+    public const E_BAD_TOPIC = true;
+    /**
+     * This error indicates that the channel sent to nsqd is not valid.
+     */
+    public const E_BAD_CHANNEL = true;
+    /**
+     * This error is returned by nsqd if the message in the payload of a publishing operation does not meet the
+     * requirements of the server. This might be caused by too big payloads being sent to nsqd. You should consider
+     * adding a limit to the payload size or increasing it in the nsqd config.
+     */
+    public const E_BAD_MESSAGE = true;
+    /**
+     * This error may happen if a error condition is met after validating the input on the nsqd side. This is usually a
+     * temporary error and can be caused by topics being added, deleted or cleared.
+     */
+    public const E_PUB_FAILED = true;
+    /**
+     * This error may happen if a error condition is met after validating the input on the nsqd side. This is usually a
+     * temporary error and can be caused by topics being added, deleted or cleared.
+     */
+    public const E_MPUB_FAILED = true;
+    /**
+     * This error may happen if a error condition is met after validating the input on the nsqd side. This is usually a
+     * temporary error and can be caused by topics being added, deleted or cleared.
+     */
+    public const E_DPUB_FAILED = true;
+    /**
+     * This error may happen if a error condition is met after validating the input on the nsqd side. This can
+     * happen in particular for messages that are no longer queued on the server side.
+     */
+    public const E_FIN_FAILED = false;
+    /**
+     * This error may happen if a error condition is met after validating the input on the nsqd side. This can
+     * happen in particular for messages that are no longer queued on the server side.
+     */
+    public const E_REQ_FAILED = false;
+    /**
+     * This error may happen if a error condition is met after validating the input on the nsqd side. This can
+     * happen in particular for messages that are no longer queued on the server side.
+     */
+    public const E_TOUCH_FAILED = false;
+    /**
+     * This error indicates that the authorization of the client failed on the server side. This might be related
+     * to connection issues to the authorization server. Depending on the authorization server implementation, this
+     * might also indicate that the given auth secret in the [ClientConfig] is not known on the server or the server
+     * denied authentication with the current connection properties (i.e. TLS status and IP).
+     */
+    public const E_AUTH_FAILED = true;
+    /**
+     * This error happens if something breaks on the nsqd side while performing the authorization. This might be
+     * caused by bugs in nsqd, the authorization server or network issues.
+     */
+    public const E_AUTH_ERROR = true;
+    /**
+     * This error is sent by nsqd if the client attempts an authentication, but the server does not support it. This
+     * should never happen using this library as authorization requests are only sent if the server supports it.
+     * It is safe to expect that this error is never thrown.
+     */
+    public const E_AUTH_DISABLED = true;
+    /**
+     * This error indicates that the client related to the authorization secret set in the [ClientConfig] is not
+     * allowed to do the operation it tried to do.
+     */
+    public const E_UNAUTHORIZED = true;
+
+    public static function terminable(Frame\Error $error): bool
+    {
+        $type = explode(' ', $error->data)[0];
+
+        $constant = 'self::'.$type;
+
+        return \defined($constant) ? \constant($constant) : self::E_INVALID;
+    }
+}

src/Exception/AuthenticationRequired.php

@@ -4,8 +4,10 @@ declare(strict_types=1);
 
 namespace Nsq\Exception;
 
-use RuntimeException;
-
-final class AuthenticationRequired extends RuntimeException implements NsqException
+final class AuthenticationRequired extends NsqException
 {
+    public function __construct()
+    {
+        parent::__construct('NSQ requires authorization, set ClientConfig::$authSecret before connecting');
+    }
 }

src/Exception/ConnectionFail.php

@@ -1,19 +0,0 @@
-<?php
-
-declare(strict_types=1);
-
-namespace Nsq\Exception;
-
-use RuntimeException;
-use Throwable;
-
-final class ConnectionFail extends RuntimeException implements NsqException
-{
-    /**
-     * @codeCoverageIgnore
-     */
-    public static function fromThrowable(Throwable $throwable): self
-    {
-        return new self($throwable->getMessage(), (int) $throwable->getCode(), $throwable);
-    }
-}

src/Exception/ConsumerException.php

@@ -0,0 +1,15 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Nsq\Exception;
+
+use Nsq\Frame\Response;
+
+final class ConsumerException extends NsqException
+{
+    public static function response(Response $response): self
+    {
+        return new self(sprintf('Consumer receive response "%s" from nsq, which not expected. ', $response->data));
+    }
+}

src/Exception/LookupException.php

@@ -0,0 +1,18 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Nsq\Exception;
+
+use Psr\Log\LogLevel;
+
+final class LookupException extends NsqException
+{
+    public function level(): string
+    {
+        return match ($this->getMessage()) {
+            'TOPIC_NOT_FOUND' => LogLevel::DEBUG,
+            default => LogLevel::WARNING,
+        };
+    }
+}

src/Exception/MessageAlreadyFinished.php

@@ -1,26 +0,0 @@
-<?php
-
-declare(strict_types=1);
-
-namespace Nsq\Exception;
-
-use Nsq\Message;
-use RuntimeException;
-
-final class MessageAlreadyFinished extends RuntimeException implements NsqException
-{
-    public static function finish(Message $message): self
-    {
-        return new self('Can\'t finish message as it already finished.');
-    }
-
-    public static function requeue(Message $message): self
-    {
-        return new self('Can\'t requeue message as it already finished.');
-    }
-
-    public static function touch(Message $message): self
-    {
-        return new self('Can\'t touch message as it already finished.');
-    }
-}

src/Exception/MessageException.php

@@ -0,0 +1,15 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Nsq\Exception;
+
+use Nsq\Message;
+
+final class MessageException extends NsqException
+{
+    public static function processed(Message $message): self
+    {
+        return new self(sprintf('Message "%s" already processed.', $message->id));
+    }
+}

src/Exception/NsqError.php

@@ -1,11 +0,0 @@
-<?php
-
-declare(strict_types=1);
-
-namespace Nsq\Exception;
-
-use RuntimeException;
-
-final class NsqError extends RuntimeException implements NsqException
-{
-}

src/Exception/NsqException.php

@@ -4,8 +4,6 @@ declare(strict_types=1);
 
 namespace Nsq\Exception;
 
-use Throwable;
-
-interface NsqException extends Throwable
+class NsqException extends \RuntimeException
 {
 }

src/Exception/ServerException.php

@@ -0,0 +1,9 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Nsq\Exception;
+
+final class ServerException extends NsqException
+{
+}

src/Exception/SnappyException.php

@@ -0,0 +1,18 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Nsq\Exception;
+
+final class SnappyException extends NsqException
+{
+    public static function notInstalled(): self
+    {
+        return new self('Snappy extension not installed.');
+    }
+
+    public static function invalidHeader(): self
+    {
+        return new self('Invalid snappy protocol header.');
+    }
+}

src/Exception/StreamException.php

@@ -0,0 +1,9 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Nsq\Exception;
+
+final class StreamException extends NsqException
+{
+}

src/Exception/UnexpectedResponse.php

@@ -1,18 +0,0 @@
-<?php
-
-declare(strict_types=1);
-
-namespace Nsq\Exception;
-
-use RuntimeException;
-
-final class UnexpectedResponse extends RuntimeException implements NsqException
-{
-    /**
-     * @codeCoverageIgnore
-     */
-    public static function null(): self
-    {
-        return new self('Response was expected, but null received.');
-    }
-}

src/Frame.php

@@ -0,0 +1,31 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Nsq;
+
+abstract class Frame
+{
+    public const TYPE_RESPONSE = 0;
+    public const TYPE_ERROR = 1;
+    public const TYPE_MESSAGE = 2;
+
+    public function __construct(public int $type)
+    {
+    }
+
+    public function response(): bool
+    {
+        return self::TYPE_RESPONSE === $this->type;
+    }
+
+    public function error(): bool
+    {
+        return self::TYPE_ERROR === $this->type;
+    }
+
+    public function message(): bool
+    {
+        return self::TYPE_MESSAGE === $this->type;
+    }
+}

src/Frame/Error.php

@@ -0,0 +1,24 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Nsq\Frame;
+
+use Nsq\Exception\ServerException;
+use Nsq\Frame;
+
+/**
+ * @psalm-immutable
+ */
+final class Error extends Frame
+{
+    public function __construct(public string $data)
+    {
+        parent::__construct(self::TYPE_ERROR);
+    }
+
+    public function toException(): ServerException
+    {
+        return new ServerException($this->data);
+    }
+}

src/Frame/Message.php

@@ -0,0 +1,19 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Nsq\Frame;
+
+use Nsq\Frame;
+
+final class Message extends Frame
+{
+    public function __construct(
+        public int $timestamp,
+        public int $attempts,
+        public string $id,
+        public string $body,
+    ) {
+        parent::__construct(self::TYPE_MESSAGE);
+    }
+}

src/Frame/Response.php

@@ -0,0 +1,39 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Nsq\Frame;
+
+use Nsq\Frame;
+
+/**
+ * @psalm-immutable
+ */
+final class Response extends Frame
+{
+    public const OK = 'OK';
+    public const HEARTBEAT = '_heartbeat_';
+
+    public function __construct(public string $data)
+    {
+        parent::__construct(self::TYPE_RESPONSE);
+    }
+
+    public function isOk(): bool
+    {
+        return self::OK === $this->data;
+    }
+
+    public function isHeartBeat(): bool
+    {
+        return self::HEARTBEAT === $this->data;
+    }
+
+    /**
+     * @psalm-return array<mixed, mixed>
+     */
+    public function toArray(): array
+    {
+        return json_decode($this->data, true, flags: JSON_THROW_ON_ERROR);
+    }
+}

src/Lookup.php

@@ -0,0 +1,274 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Nsq;
+
+use Amp\Deferred;
+use Amp\Dns\DnsException;
+use Amp\Http\Client\DelegateHttpClient;
+use Amp\Http\Client\HttpClientBuilder;
+use Amp\Http\Client\Request;
+use Amp\Http\Client\Response;
+use Amp\NullCancellationToken;
+use Amp\Promise;
+use Nsq\Config\ClientConfig;
+use Nsq\Config\LookupConfig;
+use Nsq\Exception\LookupException;
+use Psr\Log\LoggerInterface;
+use Psr\Log\NullLogger;
+
+use function Amp\asyncCall;
+use function Amp\call;
+use function Amp\delay;
+
+final class Lookup
+{
+    /**
+     * @psalm-var array<string, array<string, Lookup\Producer>>
+     */
+    private array $producers = [];
+
+    private array $consumers = [];
+
+    private array $running = [];
+
+    private array $topicWatchers = [];
+
+    public function __construct(
+        private array $addresses,
+        private LookupConfig $config,
+        private LoggerInterface $logger,
+        private DelegateHttpClient $httpClient,
+    ) {
+    }
+
+    public static function create(
+        string | array $address,
+        LookupConfig $config = null,
+        LoggerInterface $logger = null,
+        DelegateHttpClient $httpClient = null,
+    ): self {
+        return new self(
+            (array) $address,
+            $config ?? new LookupConfig(),
+            $logger ?? new NullLogger(),
+            $httpClient ?? HttpClientBuilder::buildDefault(),
+        );
+    }
+
+    /**
+     * @psalm-return Promise<Lookup\Producer[]>
+     */
+    public function nodes(): Promise
+    {
+        return call(function (): \Generator {
+            $requestHandler = function (string $uri): \Generator {
+                /** @var Response $response */
+                $response = yield $this->httpClient->request(new Request($uri.'/nodes'), new NullCancellationToken());
+
+                try {
+                    return Lookup\Response::fromJson(yield $response->getBody()->buffer());
+                } catch (LookupException $e) {
+                    $this->logger->log($e->level(), $uri.' '.$e->getMessage());
+
+                    return null;
+                }
+            };
+
+            $promises = [];
+            foreach ($this->addresses as $address) {
+                $promises[$address] = call($requestHandler, $address);
+            }
+
+            $nodes = [];
+            /** @var Lookup\Response $response */
+            foreach (yield $promises as $response) {
+                foreach ($response->producers as $producer) {
+                    $nodes[$producer->toTcpUri()] = $producer;
+                }
+            }
+
+            return array_values($nodes);
+        });
+    }
+
+    public function stop(): void
+    {
+        $this->producers = [];
+        $this->consumers = [];
+        $this->running = [];
+        $this->topicWatchers = [];
+
+        $this->logger->info('Lookup stopped.');
+    }
+
+    /**
+     * @psalm-suppress InvalidPropertyAssignmentValue
+     */
+    public function subscribe(string $topic, string $channel, callable $onMessage, ClientConfig $config = null): void
+    {
+        if (null !== ($this->running[$topic][$channel] ?? null)) {
+            throw new \InvalidArgumentException('Subscription already exists.');
+        }
+
+        $this->running[$topic][$channel] = true;
+
+        asyncCall(function () use ($topic, $channel, $onMessage, $config): \Generator {
+            while (true) {
+                if (null === ($this->running[$topic][$channel] ?? null)) {
+                    return;
+                }
+
+                /** @phpstan-ignore-next-line */
+                $producers = $this->producers[$topic] ??= new Deferred();
+
+                if ($producers instanceof Deferred) {
+                    /** @var array<string, Lookup\Producer> $producers */
+                    $producers = yield $producers->promise();
+                }
+
+                foreach (array_diff_key($this->consumers, $producers) as $address => $producer) {
+                    unset($this->consumers[$address]);
+                }
+
+                foreach ($producers as $address => $producer) {
+                    if (null !== ($this->consumers[$address][$topic][$channel] ?? null)) {
+                        continue;
+                    }
+
+                    $this->keepConnection(
+                        Consumer::create(
+                            $address,
+                            $topic,
+                            $channel,
+                            $onMessage,
+                            $config,
+                            $this->logger,
+                        ),
+                    );
+                }
+
+                yield delay($this->config->pollingInterval);
+            }
+        });
+
+        $this->watch($topic);
+
+        $this->logger->info('Subscribed.', compact('topic', 'channel'));
+    }
+
+    public function unsubscribe(string $topic, string $channel): void
+    {
+        if (null === ($this->running[$topic][$channel] ?? null)) {
+            $this->logger->debug('Not subscribed.', compact('topic', 'channel'));
+
+            return;
+        }
+
+        unset($this->running[$topic][$channel]);
+
+        if ([] === $this->running[$topic]) {
+            unset($this->running[$topic]);
+        }
+
+        $this->logger->info('Unsubscribed.', compact('topic', 'channel'));
+    }
+
+    private function keepConnection(Consumer $consumer): void
+    {
+        $this->consumers[$consumer->address][$consumer->topic][$consumer->channel] = $consumer;
+
+        asyncCall(function () use ($consumer): \Generator {
+            while (null !== ($this->consumers[$consumer->address][$consumer->topic][$consumer->channel] ?? null)) {
+                try {
+                    yield $consumer->connect();
+                } catch (DnsException $e) {
+                    $this->logger->error($e->getMessage(), ['exception' => $e]);
+
+                    unset(
+                        $this->consumers[$consumer->address],
+                        $this->producers[$consumer->topic][$consumer->address],
+                    );
+
+                    return;
+                } catch (\Throwable $e) {
+                    $this->logger->error($e->getMessage(), ['exception' => $e]);
+
+                    yield delay($this->config->pollingInterval);
+
+                    continue;
+                }
+
+                while (true) {
+                    /** @phpstan-ignore-next-line */
+                    if (null === ($this->consumers[$consumer->address][$consumer->topic][$consumer->channel] ?? null)) {
+                        $consumer->close();
+
+                        return;
+                    }
+
+                    if (!$consumer->isConnected()) {
+                        break;
+                    }
+
+                    yield delay(500);
+                }
+            }
+        });
+    }
+
+    private function watch(string $topic): void
+    {
+        if (\array_key_exists($topic, $this->topicWatchers)) {
+            return;
+        }
+
+        $this->topicWatchers[$topic] = true;
+
+        asyncCall(function () use ($topic): \Generator {
+            $cancellationToken = new NullCancellationToken();
+            $requestHandler = function (string $uri) use ($topic, $cancellationToken): \Generator {
+                $this->logger->debug('Lookup', compact('topic'));
+
+                /** @var Response $response */
+                $response = yield $this->httpClient->request(new Request($uri.'/lookup?topic='.$topic), $cancellationToken);
+
+                try {
+                    return Lookup\Response::fromJson(yield $response->getBody()->buffer());
+                } catch (LookupException $e) {
+                    $this->logger->log($e->level(), $uri.' '.$e->getMessage());
+
+                    return null;
+                }
+            };
+
+            while (\array_key_exists($topic, $this->running)) {
+                $promises = [];
+                foreach ($this->addresses as $address) {
+                    $promises[$address] = call($requestHandler, $address);
+                }
+
+                /** @var Lookup\Response[] $responses */
+                $responses = yield $promises;
+
+                $producers = [];
+                foreach ($responses as $response) {
+                    foreach ($response->producers as $producer) {
+                        $producers[$producer->toTcpUri()] = $producer;
+                    }
+                }
+
+                /** @phpstan-ignore-next-line */
+                if (($deferred = ($this->producers[$topic] ?? null)) instanceof Deferred) {
+                    $deferred->resolve($producers);
+                }
+                $this->producers[$topic] = $producers;
+
+                yield delay($this->config->pollingInterval);
+            }
+
+            unset($this->topicWatchers[$topic]);
+        });
+    }
+}

src/Lookup/Producer.php

@@ -0,0 +1,39 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Nsq\Lookup;
+
+final class Producer
+{
+    public function __construct(
+        public string $broadcastAddress,
+        public string $hostname,
+        public string $remoteAddress,
+        public int $tcpPort,
+        public int $httpPort,
+        public string $version,
+        public array $tombstones,
+        public array $topics,
+    ) {
+    }
+
+    public static function fromArray(array $array): self
+    {
+        return new self(
+            $array['broadcast_address'],
+            $array['hostname'],
+            $array['remote_address'],
+            $array['tcp_port'],
+            $array['http_port'],
+            $array['version'],
+            $array['tombstones'] ?? [],
+            $array['topics'] ?? [],
+        );
+    }
+
+    public function toTcpUri(): string
+    {
+        return sprintf('%s:%s', $this->broadcastAddress, $this->tcpPort);
+    }
+}

src/Lookup/Response.php

@@ -0,0 +1,34 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Nsq\Lookup;
+
+use Nsq\Exception\LookupException;
+
+final class Response
+{
+    /**
+     * @param string[]   $channels
+     * @param Producer[] $producers
+     */
+    public function __construct(
+        public array $channels,
+        public array $producers,
+    ) {
+    }
+
+    public static function fromJson(string $json): self
+    {
+        $array = json_decode($json, true, flags: JSON_THROW_ON_ERROR);
+
+        if (\array_key_exists('message', $array)) {
+            throw new LookupException($array['message']);
+        }
+
+        return new self(
+            $array['channels'] ?? [],
+            array_map([Producer::class, 'fromArray'], $array['producers']),
+        );
+    }
+}

src/Message.php

@@ -4,75 +4,78 @@ declare(strict_types=1);
 
 namespace Nsq;
 
-use Nsq\Exception\MessageAlreadyFinished;
+use Amp\Promise;
+use Nsq\Exception\MessageException;
 
 final class Message
 {
-    /**
-     * @psalm-readonly
-     */
-    public int $timestamp;
+    private bool $processed = false;
 
-    /**
-     * @psalm-readonly
-     */
-    public int $attempts;
-
-    /**
-     * @psalm-readonly
-     */
-    public string $id;
-
-    /**
-     * @psalm-readonly
-     */
-    public string $body;
-
-    private bool $finished = false;
-
-    private Consumer $consumer;
-
-    public function __construct(int $timestamp, int $attempts, string $id, string $body, Consumer $consumer)
-    {
-        $this->timestamp = $timestamp;
-        $this->attempts = $attempts;
-        $this->id = $id;
-        $this->body = $body;
-
-        $this->consumer = $consumer;
+    public function __construct(
+        public string $id,
+        public string $body,
+        public int $timestamp,
+        public int $attempts,
+        private Consumer $consumer,
+    ) {
     }
 
-    public function isFinished(): bool
+    public static function compose(Frame\Message $message, Consumer $consumer): self
     {
-        return $this->finished;
+        return new self(
+            $message->id,
+            $message->body,
+            $message->timestamp,
+            $message->attempts,
+            $consumer,
+        );
     }
 
-    public function finish(): void
+    public function isProcessed(): bool
     {
-        if ($this->finished) {
-            throw MessageAlreadyFinished::finish($this);
+        return $this->processed;
+    }
+
+    /**
+     * @psalm-return Promise<bool>
+     */
+    public function finish(): Promise
+    {
+        $this->markAsProcessedOrFail();
+
+        return $this->consumer->fin($this->id);
+    }
+
+    /**
+     * @psalm-param positive-int|0 $timeout
+     *
+     * @psalm-return Promise<bool>
+     */
+    public function requeue(int $timeout): Promise
+    {
+        $this->markAsProcessedOrFail();
+
+        return $this->consumer->req($this->id, $timeout);
+    }
+
+    /**
+     * @psalm-return Promise<bool>
+     */
+    public function touch(): Promise
+    {
+        if ($this->processed) {
+            throw MessageException::processed($this);
         }
 
-        $this->consumer->fin($this->id);
-        $this->finished = true;
+        return $this->consumer->touch($this->id);
     }
 
-    public function requeue(int $timeout): void
+    private function markAsProcessedOrFail(): void
     {
-        if ($this->finished) {
-            throw MessageAlreadyFinished::requeue($this);
+        if ($this->processed) {
+            throw MessageException::processed($this);
         }
 
-        $this->consumer->req($this->id, $timeout);
-        $this->finished = true;
-    }
-
-    public function touch(): void
-    {
-        if ($this->finished) {
-            throw MessageAlreadyFinished::touch($this);
-        }
-
-        $this->consumer->touch($this->id);
+        $this->processed = true;
     }
 }

src/Parser.php

@@ -0,0 +1,47 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Nsq;
+
+use Nsq\Exception\NsqException;
+
+class Parser
+{
+    private const SIZE = 4;
+    private const TYPE = 4;
+    private const MESSAGE_HEADER_SIZE =
+        8 +  // timestamp
+        2 +  // attempts
+        16 + // ID
+        4;   // Frame type
+
+    public static function parse(Buffer $buffer): ?Frame
+    {
+        if ($buffer->size() < self::SIZE) {
+            return null;
+        }
+
+        $size = $buffer->readInt32();
+
+        if ($buffer->size() < $size + self::SIZE) {
+            return null;
+        }
+
+        $buffer->discard(self::SIZE);
+
+        $type = $buffer->consumeInt32();
+
+        return match ($type) {
+            Frame::TYPE_RESPONSE => new Frame\Response($buffer->consume($size - self::TYPE)),
+            Frame::TYPE_ERROR => new Frame\Error($buffer->consume($size - self::TYPE)),
+            Frame::TYPE_MESSAGE => new Frame\Message(
+                timestamp: $buffer->consumeTimestamp(),
+                attempts: $buffer->consumeAttempts(),
+                id: $buffer->consumeMessageID(),
+                body: $buffer->consume($size - self::MESSAGE_HEADER_SIZE),
+            ),
+            default => throw new NsqException(sprintf('Unexpected frame type: "%s"', $type)),
+        };
+    }
+}

src/Producer.php

@@ -4,41 +4,127 @@ declare(strict_types=1);
 
 namespace Nsq;
 
-use function array_map;
-use function implode;
-use function pack;
+use Amp\Promise;
+use Amp\Success;
+use Nsq\Config\ClientConfig;
+use Nsq\Exception\NsqException;
+use Psr\Log\LoggerInterface;
+use Psr\Log\NullLogger;
+
+use function Amp\asyncCall;
+use function Amp\call;
 
 final class Producer extends Connection
 {
-    /**
-     * @psalm-suppress PossiblyFalseOperand
-     */
-    public function pub(string $topic, string $body): void
+    public function __construct(
+        string $address,
+        ClientConfig $clientConfig,
+        LoggerInterface $logger,
+    ) {
+        parent::__construct(
+            $address,
+            $clientConfig,
+            $logger,
+        );
+
+        $context = compact('address');
+        $this->onConnect(function () use ($context): void {
+            $this->logger->debug('Producer connected.', $context);
+        });
+        $this->onClose(function () use ($context): void {
+            $this->logger->debug('Producer disconnected.', $context);
+        });
+        $this->logger->debug('Producer created.', $context);
+    }
+
+    public static function create(
+        string $address,
+        ClientConfig $clientConfig = null,
+        LoggerInterface $logger = null,
+    ): self {
+        return new self(
+            $address,
+            $clientConfig ?? new ClientConfig(),
+            $logger ?? new NullLogger(),
+        );
+    }
+
+    public function connect(): Promise
     {
-        $this->command('PUB', $topic, $body)->response()->okOrFail();
+        if ($this->isConnected()) {
+            return call(static function (): void {
+            });
+        }
+
+        return call(function (): \Generator {
+            yield parent::connect();
+
+            $buffer = new Buffer();
+
+            asyncCall(function () use ($buffer): \Generator {
+                while (null !== $chunk = yield $this->read()) {
+                    $buffer->append($chunk);
+
+                    while ($frame = Parser::parse($buffer)) {
+                        switch (true) {
+                            case $frame instanceof Frame\Response:
+                                if ($frame->isHeartBeat()) {
+                                    yield $this->write(Command::nop());
+                                }
+
+                                // Ok received
+                                break;
+                            case $frame instanceof Frame\Error:
+                                $this->handleError($frame);
+
+                                break;
+                            default:
+                                throw new NsqException('Unreachable statement.');
+                        }
+                    }
+                }
+
+                $this->close(false);
+            });
+        });
     }
 
     /**
-     * @psalm-param array<mixed, mixed> $bodies
+     * @param array<int, string>|string $body
      *
-     * @psalm-suppress PossiblyFalseOperand
+     * @psalm-param positive-int|0      $delay
+     *
+     * @psalm-return Promise<bool>
      */
-    public function mpub(string $topic, array $bodies): void
+    public function publish(string $topic, string | array $body, int $delay = null): Promise
     {
-        $num = pack('N', \count($bodies));
+        if (!$this->isConnected()) {
+            return new Success(false);
+        }
 
-        $mb = implode('', array_map(static function ($body): string {
-            return pack('N', \strlen($body)).$body;
-        }, $bodies));
+        return call(
+            function (iterable $commands): \Generator {
+                try {
+                    foreach ($commands as $command) {
+                        yield $this->write($command);
+                    }
 
-        $this->command('MPUB', $topic, $num.$mb)->response()->okOrFail();
-    }
-
-    /**
-     * @psalm-suppress PossiblyFalseOperand
-     */
-    public function dpub(string $topic, string $body, int $delay): void
-    {
-        $this->command('DPUB', [$topic, $delay], $body)->response()->okOrFail();
+                    return true;
+                } catch (\Throwable) {
+                    return false;
+                }
+            },
+            (static function () use ($topic, $body, $delay): \Generator {
+                if (\is_array($body) && null === $delay) {
+                    yield Command::mpub($topic, $body);
+                } elseif (null !== $delay) {
+                    foreach ((array) $body as $content) {
+                        yield Command::dpub($topic, $content, $delay);
+                    }
+                } else {
+                    yield Command::pub($topic, $body);
+                }
+            })(),
+        );
     }
 }

src/Reconnect/ExponentialStrategy.php

@@ -1,63 +0,0 @@
-<?php
-
-declare(strict_types=1);
-
-namespace Nsq\Reconnect;
-
-use Nsq\Exception\ConnectionFail;
-use Psr\Log\LoggerAwareTrait;
-use Psr\Log\LoggerInterface;
-use Psr\Log\NullLogger;
-use Throwable;
-
-final class ExponentialStrategy implements ReconnectStrategy
-{
-    use LoggerAwareTrait;
-
-    private int $delay;
-
-    private int $nextTryAfter;
-
-    private int $attempt = 0;
-
-    private TimeProvider $timeProvider;
-
-    public function __construct(
-        private int $minDelay = 8,
-        private int $maxDelay = 32,
-        TimeProvider $timeProvider = null,
-        LoggerInterface $logger = null,
-    ) {
-        $this->delay = 0;
-        $this->timeProvider = $timeProvider ?? new RealTimeProvider();
-        $this->nextTryAfter = $this->timeProvider->time();
-        $this->logger = $logger ?? new NullLogger();
-    }
-
-    /**
-     * {@inheritDoc}
-     */
-    public function connect(callable $callable): void
-    {
-        $currentTime = $this->timeProvider->time();
-
-        if ($currentTime < $this->nextTryAfter) {
-            throw new ConnectionFail('Time to reconnect has not yet come');
-        }
-
-        try {
-            $callable();
-        } catch (Throwable $e) {
-            $nextDelay = 0 === $this->delay ? $this->minDelay : $this->delay * 2;
-            $this->delay = $nextDelay > $this->maxDelay ? $this->maxDelay : $nextDelay;
-            $this->nextTryAfter = $currentTime + $this->delay;
-
-            $this->logger->warning('Reconnect #{attempt} after {delay}s', ['attempt' => ++$this->attempt, 'delay' => $this->delay]);
-
-            throw $e;
-        }
-
-        $this->delay = 0;
-        $this->attempt = 0;
-    }
-}

src/Reconnect/RealTimeProvider.php

@@ -1,13 +0,0 @@
-<?php
-
-declare(strict_types=1);
-
-namespace Nsq\Reconnect;
-
-final class RealTimeProvider implements TimeProvider
-{
-    public function time(): int
-    {
-        return time();
-    }
-}

src/Reconnect/ReconnectStrategy.php

@@ -1,15 +0,0 @@
-<?php
-
-declare(strict_types=1);
-
-namespace Nsq\Reconnect;
-
-use Nsq\Exception\ConnectionFail;
-
-interface ReconnectStrategy
-{
-    /**
-     * @throws ConnectionFail
-     */
-    public function connect(callable $callable): void;
-}

src/Reconnect/TimeProvider.php

@@ -1,10 +0,0 @@
-<?php
-
-declare(strict_types=1);
-
-namespace Nsq\Reconnect;
-
-interface TimeProvider
-{
-    public function time(): int;
-}

src/Response.php

@@ -1,87 +0,0 @@
-<?php
-
-declare(strict_types=1);
-
-namespace Nsq;
-
-use Nsq\Exception\NsqError;
-use Nsq\Exception\UnexpectedResponse;
-use PHPinnacle\Buffer\ByteBuffer;
-use function json_decode;
-use function sprintf;
-use const JSON_THROW_ON_ERROR;
-
-final class Response
-{
-    private const OK = 'OK';
-    private const HEARTBEAT = '_heartbeat_';
-    private const TYPE_RESPONSE = 0;
-    private const TYPE_ERROR = 1;
-    private const TYPE_MESSAGE = 2;
-
-    private int $type;
-
-    private ByteBuffer $buffer;
-
-    public function __construct(ByteBuffer $buffer)
-    {
-        $this->type = $buffer->consumeUint32();
-        $this->buffer = $buffer;
-    }
-
-    public function okOrFail(): void
-    {
-        if (self::TYPE_ERROR === $this->type) {
-            throw new NsqError($this->buffer->bytes());
-        }
-
-        if (self::TYPE_RESPONSE !== $this->type) {
-            // @codeCoverageIgnoreStart
-            throw new UnexpectedResponse(sprintf('"%s" type expected, but "%s" received.', self::TYPE_RESPONSE, $this->type));
-            // @codeCoverageIgnoreEnd
-        }
-
-        if (self::OK !== $this->buffer->bytes()) {
-            // @codeCoverageIgnoreStart
-            throw new UnexpectedResponse(sprintf('OK response expected, but "%s" received.', $this->buffer->bytes()));
-            // @codeCoverageIgnoreEnd
-        }
-    }
-
-    public function isHeartBeat(): bool
-    {
-        return self::TYPE_RESPONSE === $this->type && self::HEARTBEAT === $this->buffer->bytes();
-    }
-
-    /**
-     * @phpstan-ignore-next-line
-     */
-    public function toArray(): array
-    {
-        if (self::TYPE_RESPONSE !== $this->type) {
-            // @codeCoverageIgnoreStart
-            throw new UnexpectedResponse(sprintf('"%s" type expected, but "%s" received.', self::TYPE_RESPONSE, $this->type));
-            // @codeCoverageIgnoreEnd
-        }
-
-        return json_decode($this->buffer->bytes(), true, flags: JSON_THROW_ON_ERROR);
-    }
-
-    public function toMessage(Consumer $reader): Message
-    {
-        if (self::TYPE_MESSAGE !== $this->type) {
-            // @codeCoverageIgnoreStart
-            throw new UnexpectedResponse(sprintf('Expecting "%s" type, but NSQ return: "%s"', self::TYPE_MESSAGE, $this->type));
-            // @codeCoverageIgnoreEnd
-        }
-
-        $buffer = new ByteBuffer($this->buffer->bytes());
-
-        $timestamp = $buffer->consumeInt64();
-        $attempts = $buffer->consumeUint16();
-        $id = $buffer->consume(Bytes::BYTES_ID);
-        $body = $buffer->flush();
-
-        return new Message($timestamp, $attempts, $id, $body, $reader);
-    }
-}

src/Stream.php

@@ -0,0 +1,26 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Nsq;
+
+use Amp\ByteStream\ClosedException;
+use Amp\Promise;
+
+interface Stream
+{
+    /**
+     * @psalm-return Promise<null|string>
+     */
+    public function read(): Promise;
+
+    /**
+     * @psalm-return Promise<void>
+     */
+    public function write(string $data): Promise;
+
+    /**
+     * @throws ClosedException
+     */
+    public function close(): void;
+}

src/Stream/GzipStream.php

@@ -0,0 +1,104 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Nsq\Stream;
+
+use Amp\Promise;
+use Nsq\Buffer;
+use Nsq\Exception\StreamException;
+use Nsq\Stream;
+
+use function Amp\call;
+
+class GzipStream implements Stream
+{
+    private ?\InflateContext $inflate = null;
+
+    private ?\DeflateContext $deflate = null;
+
+    private Buffer $buffer;
+
+    public function __construct(private Stream $stream, private int $level, string $bytes = '')
+    {
+        /** @var false|\InflateContext $inflate */
+        $inflate = @inflate_init(ZLIB_ENCODING_RAW, ['level' => $this->level]);
+        /** @var \DeflateContext|false $deflate */
+        $deflate = @deflate_init(ZLIB_ENCODING_RAW, ['level' => $this->level]);
+
+        if (false === $inflate) {
+            throw new StreamException('Failed initializing inflate context');
+        }
+
+        if (false === $deflate) {
+            throw new StreamException('Failed initializing deflate context');
+        }
+
+        $this->inflate = $inflate;
+        $this->deflate = $deflate;
+        $this->buffer = new Buffer($bytes);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function read(): Promise
+    {
+        return call(function (): \Generator {
+            if (null === $this->inflate) {
+                return null;
+            }
+
+            if ($this->buffer->empty()) {
+                $chunk = yield $this->stream->read();
+
+                if (null !== $chunk) {
+                    $this->buffer->append($chunk);
+                }
+            }
+
+            $data = $this->buffer->flush();
+
+            if ('' === $data) {
+                return null;
+            }
+            /** @psalm-suppress UndefinedFunction,InvalidArgument */
+            $decompressed = inflate_add($this->inflate, $data, ZLIB_SYNC_FLUSH);
+
+            if (false === $decompressed) {
+                throw new StreamException('Failed adding data to deflate context');
+            }
+
+            return $decompressed;
+        });
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function write(string $data): Promise
+    {
+        if (null === $this->deflate) {
+            throw new StreamException('The stream has already been closed');
+        }
+
+        /** @psalm-suppress UndefinedFunction,InvalidArgument */
+        $compressed = deflate_add($this->deflate, $data, ZLIB_SYNC_FLUSH);
+
+        if (false === $compressed) {
+            throw new StreamException('Failed adding data to deflate context');
+        }
+
+        return $this->stream->write($compressed);
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function close(): void
+    {
+        $this->stream->close();
+        $this->inflate = null;
+        $this->deflate = null;
+    }
+}

src/Stream/NullStream.php

@@ -0,0 +1,37 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Nsq\Stream;
+
+use Amp\Failure;
+use Amp\Promise;
+use Amp\Success;
+use Nsq\Exception\NsqException;
+use Nsq\Stream;
+
+final class NullStream implements Stream
+{
+    /**
+     * {@inheritdoc}
+     */
+    public function read(): Promise
+    {
+        return new Success(null);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function write(string $data): Promise
+    {
+        return new Failure(new NsqException('Connection closed.'));
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function close(): void
+    {
+    }
+}

src/Stream/SnappyStream.php

@@ -0,0 +1,122 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Nsq\Stream;
+
+use Amp\Promise;
+use Nsq\Buffer;
+use Nsq\Exception\SnappyException;
+use Nsq\Stream;
+
+use function Amp\call;
+
+class SnappyStream implements Stream
+{
+    private const IDENTIFIER = [0xFF, 0x06, 0x00, 0x00, 0x73, 0x4E, 0x61, 0x50, 0x70, 0x59];
+    private const SIZE_HEADER = 4;
+    private const SIZE_CHECKSUM = 4;
+    private const SIZE_CHUNK = 65536;
+    private const TYPE_IDENTIFIER = 0xFF;
+    private const TYPE_COMPRESSED = 0x00;
+    private const TYPE_UNCOMPRESSED = 0x01;
+    private const TYPE_PADDING = 0xFE;
+
+    private Buffer $buffer;
+
+    public function __construct(private Stream $stream, string $bytes = '')
+    {
+        if (!\function_exists('snappy_uncompress') || !\function_exists('snappy_compress')) {
+            throw SnappyException::notInstalled();
+        }
+
+        $this->buffer = new Buffer($bytes);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function read(): Promise
+    {
+        return call(function (): \Generator {
+            if ($this->buffer->size() < self::SIZE_HEADER && null !== ($chunk = yield $this->stream->read())) {
+                $this->buffer->append($chunk);
+            }
+
+            $type = $this->buffer->readUInt32LE();
+
+            $size = $type >> 8;
+            $type &= 0xFF;
+
+            while ($this->buffer->size() < $size && null !== ($chunk = yield $this->stream->read())) {
+                $this->buffer->append($chunk);
+            }
+
+            switch ($type) {
+                case self::TYPE_IDENTIFIER:
+                    $this->buffer->discard($size);
+
+                    return $this->read();
+                case self::TYPE_COMPRESSED:
+                    $this->buffer->discard(self::SIZE_CHECKSUM);
+
+                    /** @psalm-suppress UndefinedFunction */
+                    return snappy_uncompress($this->buffer->consume($size - self::SIZE_HEADER));
+                case self::TYPE_UNCOMPRESSED:
+                    $this->buffer->discard(self::SIZE_CHECKSUM);
+
+                    return $this->buffer->consume($size - self::SIZE_HEADER);
+                case self::TYPE_PADDING:
+                    return $this->read();
+                default:
+                    throw SnappyException::invalidHeader();
+            }
+        });
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function write(string $data): Promise
+    {
+        return call(function () use ($data): Promise {
+            /** @var string $result */
+            $result = pack('CCCCCCCCCC', ...self::IDENTIFIER);
+
+            foreach (str_split($data, self::SIZE_CHUNK) as $chunk) {
+                $result .= $this->compress($chunk);
+            }
+
+            return $this->stream->write($result);
+        });
+    }
+
+    public function close(): void
+    {
+        $this->stream->close();
+    }
+
+    private function compress(string $uncompressed): string
+    {
+        /** @psalm-suppress UndefinedFunction */
+        $compressed = snappy_compress($uncompressed);
+
+        \assert(\is_string($compressed));
+
+        [$type, $data] = \strlen($compressed) <= 0.875 * \strlen($uncompressed)
+            ? [self::TYPE_COMPRESSED, $compressed]
+            : [self::TYPE_UNCOMPRESSED, $uncompressed];
+
+        /** @psalm-suppress PossiblyFalseArgument */
+        $unpacked = unpack('N', hash('crc32c', $uncompressed, true));
+        \assert(\is_array($unpacked));
+
+        $checksum = $unpacked[1];
+        $checksum = (($checksum >> 15) | ($checksum << 17)) + 0xA282EAD8 & 0xFFFFFFFF;
+
+        $size = (\strlen($data) + 4) << 8;
+
+        /** @psalm-suppress PossiblyFalseOperand */
+        return pack('VV', $type + $size, $checksum).$data;
+    }
+}

src/Stream/SocketStream.php

@@ -0,0 +1,82 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Nsq\Stream;
+
+use Amp\Promise;
+use Amp\Socket\ClientTlsContext;
+use Amp\Socket\ConnectContext;
+use Amp\Socket\EncryptableSocket;
+use Nsq\Stream;
+
+use function Amp\call;
+use function Amp\Socket\connect;
+
+class SocketStream implements Stream
+{
+    public function __construct(private EncryptableSocket $socket)
+    {
+    }
+
+    /**
+     * @psalm-return Promise<self>
+     */
+    public static function connect(string $uri, int $timeout = 0, int $attempts = 0, bool $noDelay = false): Promise
+    {
+        return call(function () use ($uri, $timeout, $attempts, $noDelay): \Generator {
+            $context = new ConnectContext();
+
+            if ($timeout > 0) {
+                $context = $context->withConnectTimeout($timeout);
+            }
+
+            if ($attempts > 0) {
+                $context = $context->withMaxAttempts($attempts);
+            }
+
+            if ($noDelay) {
+                $context = $context->withTcpNoDelay();
+            }
+
+            $context = $context->withTlsContext(
+                (new ClientTlsContext(''))
+                    ->withoutPeerVerification(),
+            );
+
+            return new self(yield connect($uri, $context));
+        });
+    }
+
+    /**
+     * @psalm-return Promise<null|string>
+     */
+    public function read(): Promise
+    {
+        return $this->socket->read();
+    }
+
+    /**
+     * @psalm-return Promise<void>
+     */
+    public function write(string $data): Promise
+    {
+        return $this->socket->write($data);
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function close(): void
+    {
+        $this->socket->close();
+    }
+
+    /**
+     * @psalm-return Promise<void>
+     */
+    public function setupTls(): Promise
+    {
+        return $this->socket->setupTls();
+    }
+}

src/Subscriber.php

@@ -1,39 +0,0 @@
-<?php
-
-declare(strict_types=1);
-
-namespace Nsq;
-
-use Generator;
-
-final class Subscriber
-{
-    public const STOP = 0;
-
-    private Consumer $reader;
-
-    public function __construct(Consumer $reader)
-    {
-        $this->reader = $reader;
-    }
-
-    /**
-     * @psalm-return Generator<int, Message|float|null, int|float|null, void>
-     */
-    public function subscribe(string $topic, string $channel): Generator
-    {
-        $this->reader->sub($topic, $channel);
-
-        while (true) {
-            $this->reader->rdy(1);
-
-            $command = yield $this->reader->receive()?->toMessage($this->reader);
-
-            if (self::STOP === $command) {
-                break;
-            }
-        }
-
-        $this->reader->disconnect();
-    }
-}

tests/ClientConfigTest.php

@@ -7,6 +7,11 @@ use PHPUnit\Framework\TestCase;
 
 final class ClientConfigTest extends TestCase
 {
+    public function testNegotiationPayload(): void
+    {
+        self::assertJson((new ClientConfig())->asNegotiationPayload());
+    }
+
     public function testInvalidCompression(): void
     {
         $this->expectException(InvalidArgumentException::class);
@@ -14,4 +19,42 @@ final class ClientConfigTest extends TestCase
 
         new ClientConfig(deflate: true, snappy: true);
     }
+
+    /**
+     * @dataProvider array
+     */
+    public function testFromArray(array $data, array $expected): void
+    {
+        self::assertSame($expected, get_object_vars(ClientConfig::fromArray($data)));
+    }
+
+    public function array(): Generator
+    {
+        $default = get_object_vars(new ClientConfig());
+
+        yield 'Empty array' => [[], $default];
+
+        yield 'With wrong keys' => [['bla' => 'bla'], $default];
+
+        $custom = [
+            'authSecret' => 'SomeSecret',
+            'connectTimeout' => 100,
+            'maxAttempts' => 10,
+            'tcpNoDelay' => true,
+            'rdyCount' => 1,
+            'featureNegotiation' => true,
+            'clientId' => 'SomeGorgeousClientId',
+            'deflate' => true,
+            'deflateLevel' => 1,
+            'heartbeatInterval' => 31111,
+            'hostname' => gethostname(),
+            'msgTimeout' => 59999,
+            'sampleRate' => 25,
+            'tls' => true,
+            'snappy' => false,
+            'userAgent' => 'nsqphp/test',
+        ];
+
+        yield 'Full filled' => [$custom, $custom];
+    }
 }

tests/ErrorTypeTest.php

@@ -0,0 +1,28 @@
+<?php
+
+declare(strict_types=1);
+
+use Nsq\ErrorType;
+use Nsq\Frame\Error;
+use PHPUnit\Framework\TestCase;
+
+final class ErrorTypeTest extends TestCase
+{
+    /**
+     * @dataProvider data
+     */
+    public function testConstructor(Error $frame, bool $isConnectionTerminated): void
+    {
+        self::assertSame($isConnectionTerminated, ErrorType::terminable($frame));
+    }
+
+    /**
+     * @return \Generator<int, array{0: Error, 1: bool}>
+     */
+    public function data(): Generator
+    {
+        yield [new Error('E_BAD_BODY'), true];
+        yield [new Error('bla_bla'), true];
+        yield [new Error('E_REQ_FAILED'), false];
+    }
+}

tests/ExponentialStrategyTest.php

@@ -1,90 +0,0 @@
-<?php
-
-declare(strict_types=1);
-
-use Nsq\Exception\ConnectionFail;
-use Nsq\Reconnect\ExponentialStrategy;
-use Nsq\Reconnect\TimeProvider;
-use PHPUnit\Framework\TestCase;
-
-final class ExponentialStrategyTest extends TestCase
-{
-    public function testTimeNotYetCome(): void
-    {
-        $timeProvider = new FakeTimeProvider();
-        $strategy = new ExponentialStrategy(
-            minDelay: 8,
-            maxDelay: 32,
-            timeProvider: $timeProvider,
-        );
-
-        $successConnect = static function (int $time = null) use ($strategy, $timeProvider): void {
-            $timeProvider($time);
-
-            $strategy->connect(static function (): void {
-            });
-        };
-        $failConnect = static function (int $time = null) use ($strategy, $timeProvider): void {
-            $timeProvider($time);
-
-            try {
-                $strategy->connect(function (): void {
-                    throw new ConnectionFail('Time come but failed');
-                });
-            } catch (ConnectionFail $e) {
-                self::assertSame('Time come but failed', $e->getMessage());
-
-                return;
-            }
-
-            self::fail('Expecting exception with message "Time come but failed"');
-        };
-        $timeNotCome = static function (int $time = null) use ($strategy, $timeProvider): void {
-            $timeProvider($time);
-
-            try {
-                $strategy->connect(function (): void {
-                    throw new ConnectionFail('');
-                });
-            } catch (ConnectionFail $e) {
-                self::assertSame('Time to reconnect has not yet come', $e->getMessage());
-
-                return;
-            }
-
-            self::fail('Was expecting exception with message "Time to reconnect has not yet come"');
-        };
-
-        $failConnect(0);
-        $timeNotCome(7);
-        $failConnect(8);
-        $timeNotCome(22);
-        $timeNotCome(13);
-        $failConnect(24);
-        $successConnect(56);
-        $failConnect();
-        $timeNotCome();
-        $timeNotCome(63);
-        $failConnect(64);
-
-        $this->expectException(ConnectionFail::class);
-        $this->expectExceptionMessage('Time to reconnect has not yet come');
-
-        $successConnect();
-    }
-}
-
-class FakeTimeProvider implements TimeProvider
-{
-    public int $time = 0;
-
-    public function time(): int
-    {
-        return $this->time;
-    }
-
-    public function __invoke(int $time = null): void
-    {
-        $this->time = $time ?? $this->time;
-    }
-}

tests/MessageTest.php

@@ -2,8 +2,10 @@
 
 declare(strict_types=1);
 
+use Amp\Loop;
+use Amp\Success;
 use Nsq\Consumer;
-use Nsq\Exception\MessageAlreadyFinished;
+use Nsq\Exception\MessageException;
 use Nsq\Message;
 use PHPUnit\Framework\TestCase;
 
@@ -14,16 +16,12 @@ final class MessageTest extends TestCase
      */
     public function testDoubleFinish(Message $message): void
     {
-        self::assertFalse($message->isFinished());
+        $this->expectException(MessageException::class);
 
-        $message->finish();
-
-        self::assertTrue($message->isFinished());
-
-        $this->expectException(MessageAlreadyFinished::class);
-        $this->expectExceptionMessage('Can\'t finish message as it already finished.');
-
-        $message->finish();
+        Loop::run(function () use ($message): Generator {
+            yield $message->finish();
+            yield $message->finish();
+        });
     }
 
     /**
@@ -31,16 +29,12 @@ final class MessageTest extends TestCase
      */
     public function testDoubleRequeue(Message $message): void
     {
-        self::assertFalse($message->isFinished());
+        $this->expectException(MessageException::class);
 
-        $message->requeue(1);
-
-        self::assertTrue($message->isFinished());
-
-        $this->expectException(MessageAlreadyFinished::class);
-        $this->expectExceptionMessage('Can\'t requeue message as it already finished.');
-
-        $message->requeue(5);
+        Loop::run(function () use ($message): Generator {
+            yield $message->requeue(1);
+            yield $message->requeue(5);
+        });
     }
 
     /**
@@ -48,14 +42,12 @@ final class MessageTest extends TestCase
      */
     public function testTouchAfterFinish(Message $message): void
     {
-        self::assertFalse($message->isFinished());
+        $this->expectException(MessageException::class);
 
-        $message->finish();
-
-        $this->expectException(MessageAlreadyFinished::class);
-        $this->expectExceptionMessage('Can\'t touch message as it already finished.');
-
-        $message->touch();
+        Loop::run(function () use ($message): Generator {
+            yield $message->finish();
+            yield $message->touch();
+        });
     }
 
     /**
@@ -63,6 +55,12 @@ final class MessageTest extends TestCase
      */
     public function messages(): Generator
     {
-        yield [new Message(0, 0, 'id', 'body', $this->createStub(Consumer::class))];
+        /** @phpstan-ignore-next-line */
+        $consumer = $this->createMock(Consumer::class);
+        $consumer->method('fin')->willReturn(new Success());
+        $consumer->method('touch')->willReturn(new Success());
+        $consumer->method('req')->willReturn(new Success());
+
+        yield [new Message('id', 'body', 0, 0, $consumer)];
     }
 }

tests/NsqTest.php

@@ -3,90 +3,35 @@
 declare(strict_types=1);
 
 use Nsq\Config\ClientConfig;
-use Nsq\Consumer;
-use Nsq\Message;
-use Nsq\Producer;
-use Nsq\Subscriber;
-use Nyholm\NSA;
 use PHPUnit\Framework\TestCase;
 
 final class NsqTest extends TestCase
 {
-    public function test(): void
+    /**
+     * @dataProvider configs
+     */
+    public function test(ClientConfig $clientConfig): void
     {
-        $producer = new Producer('tcp://localhost:4150');
-        $producer->pub(__FUNCTION__, __FUNCTION__);
+        self::markTestSkipped('');
+    }
 
-        $consumer = new Consumer(
-            address: 'tcp://localhost:4150',
-            clientConfig: new ClientConfig(
-                heartbeatInterval: 1000,
-                readTimeout: 1,
+    /**
+     * @return Generator<string, array<int, ClientConfig>>
+     */
+    public function configs(): Generator
+    {
+        yield 'default' => [
+            new ClientConfig(
+                heartbeatInterval: 3000,
+                snappy: false,
             ),
-        );
-        $subscriber = new Subscriber($consumer);
-        $generator = $subscriber->subscribe(__FUNCTION__, __FUNCTION__);
+        ];
 
-        /** @var null|Message $message */
-        $message = $generator->current();
-
-        self::assertInstanceOf(Message::class, $message);
-        self::assertSame(__FUNCTION__, $message->body);
-        $message->finish();
-
-        $generator->next();
-        self::assertNull($generator->current());
-
-        $producer->mpub(__FUNCTION__, [
-            'First mpub message.',
-            'Second mpub message.',
-        ]);
-
-        $generator->next();
-        /** @var null|Message $message */
-        $message = $generator->current();
-        self::assertInstanceOf(Message::class, $message);
-        self::assertSame('First mpub message.', $message->body);
-        $message->finish();
-
-        $generator->next();
-        /** @var null|Message $message */
-        $message = $generator->current();
-        self::assertInstanceOf(Message::class, $message);
-        self::assertSame('Second mpub message.', $message->body);
-        $message->requeue(0);
-
-        $generator->next();
-        /** @var null|Message $message */
-        $message = $generator->current();
-        self::assertInstanceOf(Message::class, $message);
-        self::assertSame('Second mpub message.', $message->body);
-        $message->finish();
-
-        $producer->dpub(__FUNCTION__, 'Deferred message.', 2000);
-
-        $generator->next();
-        /** @var null|Message $message */
-        $message = $generator->current();
-        self::assertNull($message);
-
-        NSA::setProperty(
-            NSA::getProperty($consumer, 'clientConfig'),
-            'readTimeout',
-            10,
-        );
-
-        $generator->next();
-
-        /** @var null|Message $message */
-        $message = $generator->current();
-        self::assertInstanceOf(Message::class, $message);
-        self::assertSame('Deferred message.', $message->body);
-        $message->touch();
-        $message->finish();
-
-        self::assertTrue($consumer->isReady());
-        $generator->send(Subscriber::STOP);
-        self::assertFalse($consumer->isReady());
+        yield 'snappy' => [
+            new ClientConfig(
+                heartbeatInterval: 3000,
+                snappy: true,
+            ),
+        ];
     }
 }

tests/ProducerTest.php

@@ -2,7 +2,8 @@
 
 declare(strict_types=1);
 
-use Nsq\Exception\NsqError;
+use Amp\Loop;
+use Nsq\Exception\ServerException;
 use Nsq\Producer;
 use PHPUnit\Framework\TestCase;
 
@@ -13,16 +14,18 @@ final class ProducerTest extends TestCase
      */
     public function testPubFail(string $topic, string $body, string $exceptionMessage): void
     {
-        $this->expectException(NsqError::class);
+        $this->expectException(ServerException::class);
         $this->expectExceptionMessage($exceptionMessage);
 
-        $producer = new Producer('tcp://localhost:4150');
-        $producer->pub($topic, $body);
+        $producer = Producer::create('tcp://localhost:4150');
+
+        Loop::run(static function () use ($producer, $topic, $body): Generator {
+            yield $producer->connect();
+
+            yield $producer->publish($topic, $body);
+        });
     }
 
-    /**
-     * @return Generator<string, array>
-     */
     public function pubFails(): Generator
     {
         yield 'Empty body' => ['test', '', 'E_BAD_MESSAGE PUB invalid message body size 0'];