Initial commit

internal/storage/postgres/helpers.go

@@ -0,0 +1,87 @@
+package postgres
+
+import (
+	"context"
+	"database/sql"
+	"encoding/json"
+	"errors"
+	"time"
+
+	"gardomatic.kleiax.de/internal/storage"
+	"github.com/lib/pq"
+)
+
+const queryTimeout = 3 * time.Second
+
+type scanner interface {
+	Scan(dest ...any) error
+}
+
+func contextWithTimeout() (context.Context, context.CancelFunc) {
+	return context.WithTimeout(context.Background(), queryTimeout)
+}
+
+func jsonValue(value json.RawMessage) json.RawMessage {
+	if len(value) == 0 {
+		return json.RawMessage(`{}`)
+	}
+	return value
+}
+
+func deleteByID(db *sql.DB, query string, args ...any) error {
+	ctx, cancel := contextWithTimeout()
+	defer cancel()
+
+	result, err := db.ExecContext(ctx, query, args...)
+	if err != nil {
+		return err
+	}
+
+	rowsAffected, err := result.RowsAffected()
+	if err != nil {
+		return err
+	}
+	if rowsAffected == 0 {
+		return storage.ErrRecordNotFound
+	}
+	return nil
+}
+
+func deleteByGardenID(db *sql.DB, query string, gardenID, id int) error {
+	ctx, cancel := contextWithTimeout()
+	defer cancel()
+
+	result, err := db.ExecContext(ctx, query, gardenID, id)
+	if err != nil {
+		return err
+	}
+	rowsAffected, err := result.RowsAffected()
+	if err != nil {
+		return err
+	}
+	if rowsAffected == 0 {
+		return storage.ErrRecordNotFound
+	}
+	return nil
+}
+
+func recordError(err error) error {
+	if errors.Is(err, sql.ErrNoRows) {
+		return storage.ErrRecordNotFound
+	}
+	var pqError *pq.Error
+	if errors.As(err, &pqError) && pqError.Code == "23505" {
+		return storage.ErrConflict
+	}
+	if errors.As(err, &pqError) && pqError.Code == "23503" {
+		return storage.ErrConflict
+	}
+	return err
+}
+
+func nullableUserID(id int) any {
+	if id < 1 {
+		return nil
+	}
+	return id
+}