Function Call

internal/api_classic.go:91–146

(ctx context.Context, service, method string, in, out proto.Message)

}

func Call(ctx context.Context, service, method string, in, out proto.Message) error {
	if ns := NamespaceFromContext(ctx); ns != "" {
		if fn, ok := NamespaceMods[service]; ok {
			fn(in, ns)
		}
	}

	if f, ctx, ok := callOverrideFromContext(ctx); ok {
		return f(ctx, service, method, in, out)
	}

	// Handle already-done contexts quickly.
	select {
	case <-ctx.Done():
		return ctx.Err()
	default:
	}

	c := fromContext(ctx)
	if c == nil {
		// Give a good error message rather than a panic lower down.
		return errNotAppEngineContext
	}

	// Apply transaction modifications if we're in a transaction.
	if t := transactionFromContext(ctx); t != nil {
		if t.finished {
			return errors.New("transaction context has expired")
		}
		applyTransaction(in, &t.transaction)
	}

	var opts *appengine_internal.CallOptions
	if d, ok := ctx.Deadline(); ok {
		opts = &appengine_internal.CallOptions{
			Timeout: d.Sub(time.Now()),
		}
	}

	err := c.Call(service, method, in, out, opts)
	switch v := err.(type) {
	case *appengine_internal.APIError:
		return &APIError{
			Service: v.Service,
			Detail:  v.Detail,
			Code:    v.Code,
		}
	case *appengine_internal.CallError:
		return &CallError{
			Detail:  v.Detail,
			Code:    v.Code,
			Timeout: v.Timeout,
		}
	}
	return err
}

func Middleware(next http.Handler) http.Handler {