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