sixth version

internal/tinvest/retry.go

@@ -62,3 +62,27 @@ func retryValue[T any](ctx context.Context, attempts int, interval time.Duration
 	}
 	return out, nil
 }
+
+func requestWithTimeout[T any](ctx context.Context, timeout time.Duration, fn func() (T, error)) (T, error) {
+	if timeout <= 0 {
+		return fn()
+	}
+	callCtx, cancel := context.WithTimeout(ctx, timeout)
+	defer cancel()
+	type result struct {
+		value T
+		err   error
+	}
+	done := make(chan result, 1)
+	go func() {
+		value, err := fn()
+		done <- result{value: value, err: err}
+	}()
+	select {
+	case res := <-done:
+		return res.value, res.err
+	case <-callCtx.Done():
+		var zero T
+		return zero, callCtx.Err()
+	}
+}