migrator

migrator/executor.go

@@ -0,0 +1,49 @@
+package main
+
+import (
+	"context"
+	"fmt"
+	"os"
+	"path"
+
+	"github.com/jmoiron/sqlx"
+	"github.com/pkg/errors"
+)
+
+func migrate(ctx context.Context, pathToMigrations string) error {
+	files, err := os.ReadDir(pathToMigrations)
+	if err != nil {
+		return errors.Wrapf(err, "read directory failed: %v", err)
+	}
+
+	if err = checkVersion(ctx, ""); err != nil {
+		return err
+	}
+
+	for _, file := range files {
+		if err = execute(ctx, path.Join(pathToMigrations, file.Name())); err != nil {
+			return errors.Wrapf(err, "migration for file %s failed: %v", file.Name(), err)
+		}
+	}
+
+	return nil
+}
+
+func execute(ctx context.Context, pathToFile string) error {
+	if pathToFile == "" {
+		return fmt.Errorf("empty path to sql file")
+	}
+
+	conn, err := sqlx.Connect("postgres", "")
+	if err != nil {
+		return errors.Wrapf(err, "connect to database was failed: %v", err)
+	}
+
+	defer conn.Close()
+
+	if _, err = conn.ExecContext(ctx, ""); err != nil {
+		return errors.Wrapf(err, "exec migration script was failed: %v", err)
+	}
+
+	return nil
+}

migrator/migrator.go

@@ -0,0 +1,16 @@
+package main
+
+import (
+	"log"
+
+	"golang.org/x/net/context"
+)
+
+func main() {
+	ctx, cancel := context.WithTimeout(context.Background(), 3000)
+	defer cancel()
+
+	if err := migrate(ctx, ""); err != nil {
+		log.Fatal(err)
+	}
+}

migrator/version.go

@@ -0,0 +1,67 @@
+package main
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/jmoiron/sqlx"
+	"github.com/pkg/errors"
+)
+
+const (
+	selectTableVersionIsExist = "SELECT 1 FROM information_schema.tables WHERE scheme = 'public' AND name = 'db_version'"
+	createTableVersion        = "CREATE TABLE public.db_version (id SERIAL, name TEXT, created_at TIMESTAMP, processing_at TIMESTAMP, status TEXT)"
+)
+
+func checkVersion(ctx context.Context, connectionString string) error {
+	conn, err := sqlx.Connect("postgres", connectionString)
+	if err != nil {
+		return errors.Wrapf(err, "connect to database failed: %v", err)
+	}
+	defer conn.Close()
+
+	rows, err := conn.QueryContext(ctx, selectTableVersionIsExist)
+	if err != nil {
+		return errors.Wrapf(err, "check table version is exist failed: %v", err)
+	}
+
+	if rows.Next() {
+		return nil
+	}
+
+	if _, err = conn.ExecContext(ctx, createTableVersion); err != nil {
+		return errors.Wrapf(err, "create table version failed: %v", err)
+	}
+
+	return nil
+}
+
+const createStatusQuery = ""
+
+func createStatus(ctx context.Context, conn *sqlx.DB, name, status string) error {
+	if conn == nil {
+		return fmt.Errorf("")
+	}
+
+	_, err := conn.ExecContext(ctx, createStatusQuery)
+	if err != nil {
+		return errors.Wrapf(err, "create status failed: %v", err)
+	}
+
+	return nil
+}
+
+const updateStatusQuery = ""
+
+func updateStatus(ctx context.Context, conn *sqlx.DB, status string) error {
+	if conn == nil {
+		return fmt.Errorf("")
+	}
+
+	_, err := conn.ExecContext(ctx, updateStatusQuery, status)
+	if err != nil {
+		return errors.Wrapf(err, "update status failed: %v", err)
+	}
+
+	return nil
+}