jackc/pgx · error · ConnectError

AfterConnect error: %w

Error message

AfterConnect error: %w

What it means

Error "AfterConnect error: %w" thrown in jackc/pgx.

Source

Thrown at pgconn/pgconn.go:171

	if len(errs) > 0 {
		allErrors = append(allErrors, errs...)
	}

	if len(connectConfigs) == 0 {
		return nil, &ConnectError{Config: config, err: fmt.Errorf("hostname resolving error: %w", errors.Join(allErrors...))}
	}

	pgConn, errs := connectPreferred(ctx, config, connectConfigs)
	if len(errs) > 0 {
		allErrors = append(allErrors, errs...)
		return nil, &ConnectError{Config: config, err: errors.Join(allErrors...)}
	}

	if config.AfterConnect != nil {
		err := config.AfterConnect(ctx, pgConn)
		if err != nil {
			pgConn.conn.Close()
			return nil, &ConnectError{Config: config, err: fmt.Errorf("AfterConnect error: %w", err)}
		}
	}

	return pgConn, nil
}

// buildConnectOneConfigs resolves hostnames and builds a list of connectOneConfigs to try connecting to. It returns a
// slice of successfully resolved connectOneConfigs and a slice of errors. It is possible for both slices to contain
// values if some hosts were successfully resolved and others were not.
func buildConnectOneConfigs(ctx context.Context, config *Config) ([]*connectOneConfig, []error) {
	// Simplify usage by treating primary config and fallbacks the same.
	fallbackConfigs := []*FallbackConfig{
		{
			Host:      config.Host,
			Port:      config.Port,
			TLSConfig: config.TLSConfig,
		},
	}

View on GitHub (pinned to ec1a0befd2)

When it happens

Trigger: Thrown at pgconn/pgconn.go:171 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of jackc/pgx@ec1a0befd2 (2026-08-04). Data as JSON: /data/errors/32e1630a34b27109.json. Report an issue: GitHub.