feat: string-unpack api

.env.dist

@@ -4,3 +4,4 @@ GOVERTER_VER=v1.4.0
 GOLANGCI_LINT_VER=v1.56.2
 POSTGRES_VER=16.2
 AIR_VER=1.52.0
+SQLC_VER=1.26.0

Dockerfile

@@ -4,7 +4,7 @@ ARG ALPINE_VER
 
 FROM postgres:${POSTGRES_VER} AS postgres
 
-COPY ./db/* /docker-entrypoint-initdb.d/
+COPY ./string-unpack/internal/db/* /docker-entrypoint-initdb.d/
 
 RUN set -ex \
     && chmod 1777 /tmp

Taskfile.yaml

@@ -38,6 +38,7 @@ tasks:
   generate:
     desc: all generators + cs.
     cmds:
+    - task: sqlc
     - task: goverter
     - task: go:generate
     - task: cs
@@ -124,6 +125,16 @@ tasks:
     sources:
     - ./**/*.go
 
+  sqlc:
+    desc: go run sqlc.
+    deps: [ dotenv ]
+    cmds:
+    - go run github.com/sqlc-dev/sqlc/cmd/sqlc@v{{.SQLC_VER}} generate
+    sources:
+    - sqlc.yaml
+    - ./**/sql/**/*
+    - ./**/db/**/*
+
   # =========
   # OPERATION
   # =========
@@ -147,7 +158,7 @@ tasks:
     cmds:
     - docker compose build postgres
     sources:
-    - db/**/*
+    - ./**/db/**/*
     - Dockerfile
     - docker-compose.yml
 

cmd/api/config.go

@@ -0,0 +1,24 @@
+package main
+
+import (
+	"flag"
+	"time"
+
+	"github.com/kelseyhightower/envconfig"
+)
+
+type Config struct {
+	DSN              string        `envconfig:"DSN" default:"postgresql://postgres:postgres@postgres:5432/postgres?sslmode=disable"`
+	ReconnectTimeout time.Duration `envconfig:"RECONNECT_TIMEOUT" default:"2s"`
+}
+
+func (c *Config) Parse() error {
+	flag.StringVar(&c.DSN, "DSN", "", "postgresql DSN")
+	flag.Parse()
+
+	if err := envconfig.Process("", c); err != nil {
+		return err
+	}
+
+	return nil
+}

cmd/api/main.go

@@ -0,0 +1,113 @@
+package main
+
+import (
+	"context"
+	"errors"
+	"net/http"
+	"os/signal"
+	"syscall"
+	"time"
+
+	"github.com/jackc/pgx/v5"
+
+	stringunpack "git.grachevko.ru/grachevko/h/string-unpack"
+
+	"github.com/gin-gonic/gin"
+	"github.com/prometheus/client_golang/prometheus"
+	collector "github.com/prometheus/client_golang/prometheus/collectors/version"
+	"github.com/prometheus/client_golang/prometheus/promhttp"
+	"go.uber.org/zap"
+	"golang.org/x/sync/errgroup"
+)
+
+func main() {
+	logger, _ := zap.NewProduction()
+	defer func(logger *zap.Logger) {
+		_ = logger.Sync()
+	}(logger) // flushes buffer, if any
+
+	cfg := Config{}
+	if err := cfg.Parse(); err != nil {
+		logger.Fatal("config parse", zap.Error(err))
+	}
+
+	ctx := context.Background()
+
+	ctx, stop := signal.NotifyContext(ctx, syscall.SIGINT, syscall.SIGTERM)
+	defer stop()
+
+	var metricServer *http.Server
+	{ // Metrics
+		prometheus.MustRegister(collector.NewCollector("unpack"))
+		mux := http.NewServeMux()
+		mux.Handle("/metrics", promhttp.Handler())
+		metricServer = &http.Server{
+			Handler: mux,
+			Addr:    ":8089",
+		}
+
+		go func() {
+			if err := metricServer.ListenAndServe(); err != nil {
+				logger.Error("metric server failed", zap.Error(err))
+			}
+		}()
+	} // Metrics
+
+pgconn:
+	conn, err := pgx.Connect(ctx, cfg.DSN)
+	if err != nil {
+		logger.Error("pgx", zap.Error(err))
+
+		logger.Info("Wait before reconnect", zap.Duration("after", cfg.ReconnectTimeout))
+		<-time.After(cfg.ReconnectTimeout)
+		logger.Info("Retrying connection")
+		goto pgconn
+	}
+	defer func(conn *pgx.Conn, ctx context.Context) {
+		if err = conn.Close(ctx); err != nil {
+			logger.Error("pgx close", zap.Error(err))
+		}
+	}(conn, ctx)
+
+	var httpServer *http.Server
+	{ // Http
+		r := gin.Default()
+
+		stringunpack.Setup(ctx, logger, r.Group("unpack"), conn)
+
+		httpServer = &http.Server{
+			Addr:    ":8080",
+			Handler: r,
+		}
+
+		go func() {
+			if err := httpServer.ListenAndServe(); err != nil && !errors.Is(err, http.ErrServerClosed) {
+				logger.Error("http server failed", zap.Error(err))
+			}
+		}()
+	} // Http
+
+	// Listen for the interrupt signal.
+	<-ctx.Done()
+
+	{ // Graceful shutdown
+		// Restore default behavior on the interrupt signal and notify user of shutdown.
+		stop()
+		logger.Info("shutting down gracefully, press Ctrl+C again to force")
+
+		// The context is used to inform the server it has 5 seconds to finish
+		// the request it is currently handling
+		ctx, cancel := context.WithTimeout(ctx, 5*time.Second)
+		defer cancel()
+
+		g, ctx := errgroup.WithContext(ctx)
+		g.Go(func() error { return metricServer.Shutdown(ctx) })
+		g.Go(func() error { return httpServer.Shutdown(ctx) })
+
+		if err := g.Wait(); err != nil {
+			logger.Error("graceful shutdown failed", zap.Error(err))
+		}
+	} // Graceful shutdown
+
+	logger.Info("Server exiting")
+}

go.mod

@@ -1,14 +1,53 @@
 module git.grachevko.ru/grachevko/h
 
-go 1.22.2
+go 1.22.3
 
 require (
+	github.com/gin-gonic/gin v1.10.0
+	github.com/jackc/pgx/v5 v5.5.5
+	github.com/kelseyhightower/envconfig v1.4.0
+	github.com/prometheus/client_golang v1.19.0
 	github.com/stretchr/testify v1.9.0
+	go.uber.org/zap v1.27.0
 	golang.org/x/exp v0.0.0-20240506185415-9bf2ced13842
+	golang.org/x/sync v0.7.0
 )
 
 require (
+	github.com/beorn7/perks v1.0.1 // indirect
+	github.com/bytedance/sonic v1.11.6 // indirect
+	github.com/bytedance/sonic/loader v0.1.1 // indirect
+	github.com/cespare/xxhash/v2 v2.2.0 // indirect
+	github.com/cloudwego/base64x v0.1.4 // indirect
+	github.com/cloudwego/iasm v0.2.0 // indirect
 	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/gabriel-vasile/mimetype v1.4.3 // indirect
+	github.com/gin-contrib/sse v0.1.0 // indirect
+	github.com/go-playground/locales v0.14.1 // indirect
+	github.com/go-playground/universal-translator v0.18.1 // indirect
+	github.com/go-playground/validator/v10 v10.20.0 // indirect
+	github.com/goccy/go-json v0.10.2 // indirect
+	github.com/jackc/pgpassfile v1.0.0 // indirect
+	github.com/jackc/pgservicefile v0.0.0-20221227161230-091c0ba34f0a // indirect
+	github.com/json-iterator/go v1.1.12 // indirect
+	github.com/klauspost/cpuid/v2 v2.2.7 // indirect
+	github.com/leodido/go-urn v1.4.0 // indirect
+	github.com/mattn/go-isatty v0.0.20 // indirect
+	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
+	github.com/modern-go/reflect2 v1.0.2 // indirect
+	github.com/pelletier/go-toml/v2 v2.2.2 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
+	github.com/prometheus/client_model v0.6.0 // indirect
+	github.com/prometheus/common v0.53.0 // indirect
+	github.com/prometheus/procfs v0.12.0 // indirect
+	github.com/twitchyliquid64/golang-asm v0.15.1 // indirect
+	github.com/ugorji/go/codec v1.2.12 // indirect
+	go.uber.org/multierr v1.10.0 // indirect
+	golang.org/x/arch v0.8.0 // indirect
+	golang.org/x/crypto v0.23.0 // indirect
+	golang.org/x/net v0.25.0 // indirect
+	golang.org/x/sys v0.20.0 // indirect
+	golang.org/x/text v0.15.0 // indirect
+	google.golang.org/protobuf v1.34.1 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 )

go.sum

@@ -1,12 +1,126 @@
+github.com/beorn7/perks v1.0.1 h1:VlbKKnNfV8bJzeqoa4cOKqO6bYr3WgKZxO8Z16+hsOM=
+github.com/beorn7/perks v1.0.1/go.mod h1:G2ZrVWU2WbWT9wwq4/hrbKbnv/1ERSJQ0ibhJ6rlkpw=
+github.com/bytedance/sonic v1.11.6 h1:oUp34TzMlL+OY1OUWxHqsdkgC/Zfc85zGqw9siXjrc0=
+github.com/bytedance/sonic v1.11.6/go.mod h1:LysEHSvpvDySVdC2f87zGWf6CIKJcAvqab1ZaiQtds4=
+github.com/bytedance/sonic/loader v0.1.1 h1:c+e5Pt1k/cy5wMveRDyk2X4B9hF4g7an8N3zCYjJFNM=
+github.com/bytedance/sonic/loader v0.1.1/go.mod h1:ncP89zfokxS5LZrJxl5z0UJcsk4M4yY2JpfqGeCtNLU=
+github.com/cespare/xxhash/v2 v2.2.0 h1:DC2CZ1Ep5Y4k3ZQ899DldepgrayRUGE6BBZ/cd9Cj44=
+github.com/cespare/xxhash/v2 v2.2.0/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
+github.com/cloudwego/base64x v0.1.4 h1:jwCgWpFanWmN8xoIUHa2rtzmkd5J2plF/dnLS6Xd/0Y=
+github.com/cloudwego/base64x v0.1.4/go.mod h1:0zlkT4Wn5C6NdauXdJRhSKRlJvmclQ1hhJgA0rcu/8w=
+github.com/cloudwego/iasm v0.2.0 h1:1KNIy1I1H9hNNFEEH3DVnI4UujN+1zjpuk6gwHLTssg=
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+github.com/gabriel-vasile/mimetype v1.4.3 h1:in2uUcidCuFcDKtdcBxlR0rJ1+fsokWf+uqxgUFjbI0=
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sqlc.yaml

@@ -0,0 +1,14 @@
+version: "2"
+sql:
+- engine: "postgresql"
+  queries: "string-unpack/internal/sql/"
+  schema: "string-unpack/internal/db/schema.sql"
+  gen:
+    go:
+      out: "string-unpack/internal/sql"
+      sql_package: "pgx/v5"
+      emit_db_tags: true
+      emit_interface: true
+      emit_json_tags: true
+      emit_methods_with_db_argument: false
+      query_parameter_limit: 0

string-unpack/internal/db/schema.sql

@@ -0,0 +1,10 @@
+CREATE EXTENSION IF NOT EXISTS pgcrypto;
+
+CREATE TABLE unpack_history
+(
+    id         uuid        default gen_random_uuid() primary key,
+    input      text NOT NULL,
+    result     text NOT NULL,
+    created_at timestamptz DEFAULT NOW()
+)
+;

string-unpack/internal/sql/db.go

@@ -0,0 +1,32 @@
+// Code generated by sqlc. DO NOT EDIT.
+// versions:
+//   sqlc v1.26.0
+
+package sql
+
+import (
+	"context"
+
+	"github.com/jackc/pgx/v5"
+	"github.com/jackc/pgx/v5/pgconn"
+)
+
+type DBTX interface {
+	Exec(context.Context, string, ...interface{}) (pgconn.CommandTag, error)
+	Query(context.Context, string, ...interface{}) (pgx.Rows, error)
+	QueryRow(context.Context, string, ...interface{}) pgx.Row
+}
+
+func New(db DBTX) *Queries {
+	return &Queries{db: db}
+}
+
+type Queries struct {
+	db DBTX
+}
+
+func (q *Queries) WithTx(tx pgx.Tx) *Queries {
+	return &Queries{
+		db: tx,
+	}
+}

string-unpack/internal/sql/insert.sql

@@ -0,0 +1,9 @@
+-- name: Insert :one
+INSERT INTO unpack_history (input, result)
+VALUES (@input, @result)
+RETURNING
+    id,
+    input,
+    result,
+    created_at
+;

string-unpack/internal/sql/insert.sql.go

@@ -0,0 +1,37 @@
+// Code generated by sqlc. DO NOT EDIT.
+// versions:
+//   sqlc v1.26.0
+// source: insert.sql
+
+package sql
+
+import (
+	"context"
+)
+
+const insert = `-- name: Insert :one
+INSERT INTO unpack_history (input, result)
+VALUES ($1, $2)
+RETURNING
+    id,
+    input,
+    result,
+    created_at
+`
+
+type InsertParams struct {
+	Input  string `db:"input" json:"input"`
+	Result string `db:"result" json:"result"`
+}
+
+func (q *Queries) Insert(ctx context.Context, arg InsertParams) (UnpackHistory, error) {
+	row := q.db.QueryRow(ctx, insert, arg.Input, arg.Result)
+	var i UnpackHistory
+	err := row.Scan(
+		&i.ID,
+		&i.Input,
+		&i.Result,
+		&i.CreatedAt,
+	)
+	return i, err
+}

string-unpack/internal/sql/latest.sql

@@ -0,0 +1,9 @@
+-- name: Latest :many
+SELECT id,
+       input,
+       result,
+       created_at
+FROM unpack_history
+ORDER BY created_at DESC
+LIMIT 15
+;

string-unpack/internal/sql/latest.sql.go

@@ -0,0 +1,45 @@
+// Code generated by sqlc. DO NOT EDIT.
+// versions:
+//   sqlc v1.26.0
+// source: latest.sql
+
+package sql
+
+import (
+	"context"
+)
+
+const latest = `-- name: Latest :many
+SELECT id,
+       input,
+       result,
+       created_at
+FROM unpack_history
+ORDER BY created_at DESC
+LIMIT 15
+`
+
+func (q *Queries) Latest(ctx context.Context) ([]UnpackHistory, error) {
+	rows, err := q.db.Query(ctx, latest)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+	var items []UnpackHistory
+	for rows.Next() {
+		var i UnpackHistory
+		if err := rows.Scan(
+			&i.ID,
+			&i.Input,
+			&i.Result,
+			&i.CreatedAt,
+		); err != nil {
+			return nil, err
+		}
+		items = append(items, i)
+	}
+	if err := rows.Err(); err != nil {
+		return nil, err
+	}
+	return items, nil
+}

string-unpack/internal/sql/models.go

@@ -0,0 +1,16 @@
+// Code generated by sqlc. DO NOT EDIT.
+// versions:
+//   sqlc v1.26.0
+
+package sql
+
+import (
+	"github.com/jackc/pgx/v5/pgtype"
+)
+
+type UnpackHistory struct {
+	ID        pgtype.UUID        `db:"id" json:"id"`
+	Input     string             `db:"input" json:"input"`
+	Result    string             `db:"result" json:"result"`
+	CreatedAt pgtype.Timestamptz `db:"created_at" json:"created_at"`
+}

string-unpack/internal/sql/querier.go

@@ -0,0 +1,16 @@
+// Code generated by sqlc. DO NOT EDIT.
+// versions:
+//   sqlc v1.26.0
+
+package sql
+
+import (
+	"context"
+)
+
+type Querier interface {
+	Insert(ctx context.Context, arg InsertParams) (UnpackHistory, error)
+	Latest(ctx context.Context) ([]UnpackHistory, error)
+}
+
+var _ Querier = (*Queries)(nil)

string-unpack/server.go

@@ -0,0 +1,78 @@
+package stringunpack
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"net/http"
+
+	"git.grachevko.ru/grachevko/h/string-unpack/internal/sql"
+	"github.com/gin-gonic/gin"
+	"github.com/jackc/pgx/v5"
+	"go.uber.org/zap"
+)
+
+var queries sql.Querier
+
+func Setup(ctx context.Context, logger *zap.Logger, r *gin.RouterGroup, conn *pgx.Conn) {
+	if queries != nil {
+		panic("Setup must call only once")
+	}
+
+	queries = sql.New(conn)
+
+	unpack := func(input string) (r string, err error) {
+		r, err = Unpack(input)
+
+		{ // history
+			result := r
+			if err != nil {
+				result = fmt.Sprintf("err: %s", err.Error())
+			}
+			_, err := queries.Insert(ctx, sql.InsertParams{
+				Input:  input,
+				Result: result,
+			})
+			if err != nil {
+				logger.Error("pg insert", zap.Error(err))
+			}
+		} // history
+
+		return
+	}
+
+	r.GET("history", func(c *gin.Context) {
+		latest, err := queries.Latest(ctx)
+		if err != nil {
+			c.AbortWithStatusJSON(http.StatusInternalServerError, gin.H{
+				"err": err.Error(),
+			})
+
+			return
+		}
+
+		c.JSON(http.StatusOK, latest)
+	})
+
+	r.GET(":s", func(c *gin.Context) {
+		s := c.Param("s")
+
+		result, err := unpack(s)
+		if errors.Is(err, ErrIncorrectString) {
+			c.AbortWithStatusJSON(http.StatusBadRequest, gin.H{
+				"err": err.Error(),
+			})
+
+			return
+		}
+		if err != nil {
+			logger.Error("unpack", zap.Error(err))
+
+			c.AbortWithStatus(http.StatusInternalServerError)
+		}
+
+		c.JSON(http.StatusOK, gin.H{
+			"result": result,
+		})
+	})
+}