90 lines
2.4 KiB
Go
90 lines
2.4 KiB
Go
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// Copyright 2016 Google Inc. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package internal
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import (
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"errors"
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"fmt"
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"testing"
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"time"
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gax "github.com/googleapis/gax-go"
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"golang.org/x/net/context"
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"google.golang.org/grpc/codes"
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"google.golang.org/grpc/status"
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)
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func TestRetry(t *testing.T) {
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ctx := context.Background()
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// Without a context deadline, retry will run until the function
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// says not to retry any more.
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n := 0
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endRetry := errors.New("end retry")
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err := retry(ctx, gax.Backoff{},
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func() (bool, error) {
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n++
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if n < 10 {
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return false, nil
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}
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return true, endRetry
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},
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func(context.Context, time.Duration) error { return nil })
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if got, want := err, endRetry; got != want {
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t.Errorf("got %v, want %v", err, endRetry)
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}
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if n != 10 {
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t.Errorf("n: got %d, want %d", n, 10)
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}
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// If the context has a deadline, sleep will return an error
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// and end the function.
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n = 0
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err = retry(ctx, gax.Backoff{},
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func() (bool, error) { return false, nil },
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func(context.Context, time.Duration) error {
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n++
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if n < 10 {
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return nil
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}
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return context.DeadlineExceeded
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})
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if err == nil {
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t.Error("got nil, want error")
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}
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}
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func TestRetryPreserveError(t *testing.T) {
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// Retry tries to preserve the type and other information from
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// the last error returned by the function.
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err := retry(context.Background(), gax.Backoff{},
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func() (bool, error) {
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return false, status.Error(codes.NotFound, "not found")
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},
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func(context.Context, time.Duration) error {
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return context.DeadlineExceeded
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})
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got, ok := status.FromError(err)
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if !ok {
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t.Fatalf("got %T, wanted a status", got)
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}
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if g, w := got.Code(), codes.NotFound; g != w {
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t.Errorf("got code %v, want %v", g, w)
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}
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wantMessage := fmt.Sprintf("retry failed with %v; last error: not found", context.DeadlineExceeded)
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if g, w := got.Message(), wantMessage; g != w {
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t.Errorf("got message %q, want %q", g, w)
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}
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}
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