/
retry_test.go
127 lines (114 loc) · 3.11 KB
/
retry_test.go
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// Copyright 2021 Google LLC
//
// 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 metadata
import (
"io"
"testing"
"time"
)
type constantBackoff struct{}
func (b constantBackoff) Pause() time.Duration { return 100 }
type errTemp struct{}
func (e errTemp) Error() string { return "temporary error" }
func (e errTemp) Temporary() bool { return true }
type errWrapped struct {
e error
}
func (e errWrapped) Error() string { return "unwrap me to get more context" }
func (e errWrapped) Unwrap() error { return e.e }
func TestMetadataRetryer(t *testing.T) {
tests := []struct {
name string
code int
err error
wantDelay time.Duration
wantShouldRetry bool
}{
{
name: "retry on 500",
code: 500,
wantDelay: 100,
wantShouldRetry: true,
},
{
name: "don't retry on 400",
code: 400,
err: io.EOF,
wantDelay: 0,
wantShouldRetry: false,
},
{
name: "retry on io.ErrUnexpectedEOF",
code: 400,
err: io.ErrUnexpectedEOF,
wantDelay: 100,
wantShouldRetry: true,
},
{
name: "retry on temporary error",
code: 400,
err: errTemp{},
wantDelay: 100,
wantShouldRetry: true,
},
{
name: "retry on wrapped temporary error",
code: 400,
err: errWrapped{errTemp{}},
wantDelay: 100,
wantShouldRetry: true,
},
{
name: "don't retry on wrapped io.EOF",
code: 400,
err: errWrapped{io.EOF},
wantDelay: 0,
wantShouldRetry: false,
},
{
name: "don't retry 200",
code: 200,
err: nil,
wantDelay: 0,
wantShouldRetry: false,
},
}
for _, tc := range tests {
t.Run(tc.name, func(t *testing.T) {
retryer := metadataRetryer{bo: constantBackoff{}}
delay, shouldRetry := retryer.Retry(tc.code, tc.err)
if delay != tc.wantDelay {
t.Fatalf("retryer.Retry(%v, %v) = %v, want %v", tc.code, tc.err, delay, tc.wantDelay)
}
if shouldRetry != tc.wantShouldRetry {
t.Fatalf("retryer.Retry(%v, %v) = %v, want %v", tc.code, tc.err, shouldRetry, tc.wantShouldRetry)
}
})
}
}
func TestMetadataRetryerAttempts(t *testing.T) {
retryer := metadataRetryer{bo: constantBackoff{}}
for i := 1; i <= 6; i++ {
_, shouldRetry := retryer.Retry(500, nil)
if i == 6 {
if shouldRetry {
t.Fatal("an error should only be retried 5 times")
}
break
}
if !shouldRetry {
t.Fatalf("retryer.Retry(500, nil) = false, want true")
}
}
}