(Feat): Initial Commit

cmd/db/migrate.go

@@ -0,0 +1,97 @@
+package db
+
+import (
+	"context"
+	"database/sql"
+	"fmt"
+
+	"allaboutapps.dev/aw/go-starter/internal/api"
+	"allaboutapps.dev/aw/go-starter/internal/config"
+	"allaboutapps.dev/aw/go-starter/internal/util"
+	"allaboutapps.dev/aw/go-starter/internal/util/command"
+	"github.com/rs/zerolog/log"
+	migrate "github.com/rubenv/sql-migrate"
+	"github.com/spf13/cobra"
+)
+
+func newMigrate() *cobra.Command {
+	return &cobra.Command{
+		Use:   "migrate",
+		Short: "Executes all migrations which are not yet applied.",
+		Run: func(_ *cobra.Command, _ []string) {
+			migrateCmdFunc()
+		},
+	}
+}
+
+func migrateCmdFunc() {
+	err := command.WithServer(context.Background(), config.DefaultServiceConfigFromEnv(), func(ctx context.Context, s *api.Server) error {
+		log := util.LogFromContext(ctx)
+
+		n, err := ApplyMigrations(ctx, s.Config)
+		if err != nil {
+			log.Err(err).Msg("Error while applying migrations")
+			return err
+		}
+
+		log.Info().Int("appliedMigrationsCount", n).Msg("Successfully applied migrations")
+
+		return nil
+	})
+	if err != nil {
+		log.Fatal().Err(err).Msg("Failed to apply migrations")
+	}
+}
+
+func ApplyMigrations(ctx context.Context, serviceConfig config.Server) (int, error) {
+	log := util.LogFromContext(ctx)
+
+	// pin migrate to use the globally defined `migrations` table identifier
+	migrate.SetTable(config.DatabaseMigrationTable)
+
+	db, err := sql.Open("postgres", serviceConfig.Database.ConnectionString())
+	if err != nil {
+		return 0, fmt.Errorf("failed to open the database: %w", err)
+	}
+	defer db.Close()
+
+	if err := db.PingContext(ctx); err != nil {
+		return 0, fmt.Errorf("failed to ping the database: %w", err)
+	}
+
+	// In case an old default sql-migrate migration table (named "gorp_migrations") still exists we rename it to the new name equivalent
+	// in sync with the settings in dbconfig.yml and config.DatabaseMigrationTable.
+	if _, err := db.ExecContext(ctx, fmt.Sprintf("ALTER TABLE IF EXISTS gorp_migrations RENAME TO %s;", config.DatabaseMigrationTable)); err != nil {
+		return 0, fmt.Errorf("failed to rename migrations table: %w", err)
+	}
+
+	migrations := &migrate.FileMigrationSource{
+		Dir: config.DatabaseMigrationFolder,
+	}
+
+	missingMigrations, _, err := migrate.PlanMigration(db, "postgres", migrations, migrate.Up, 0)
+	if err != nil {
+		log.Err(err).Msg("Error while planning migrations")
+		return 0, fmt.Errorf("failed to plan migrations: %w", err)
+	}
+
+	var appliedMigrationsCount int
+	for i := 0; i < len(missingMigrations); i++ {
+		log.Info().Str("migrationId", missingMigrations[i].Id).Msg("Applying migration")
+
+		n, err := migrate.ExecMax(db, "postgres", migrations, migrate.Up, 1)
+		if err != nil {
+			log.Err(err).Msg("Error while applying migration")
+			return 0, fmt.Errorf("failed to apply migration: %w", err)
+		}
+
+		log.Info().Int("appliedMigrationsCount", n).Msg("Applied migration")
+
+		appliedMigrationsCount += n
+		if n == 0 {
+			break
+		}
+	}
+
+	return appliedMigrationsCount, nil
+}