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client: support backoff mechanism for memberLoop (#6978)
ref #6556 Signed-off-by: husharp <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,86 @@ | ||
| // Copyright 2023 TiKV Project Authors. | ||
| // | ||
| // 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 retry | ||
|
|
||
| import ( | ||
| "context" | ||
| "time" | ||
|
|
||
| "github.com/pingcap/failpoint" | ||
| ) | ||
|
|
||
| // BackOffer is a backoff policy for retrying operations. | ||
| type BackOffer struct { | ||
| max time.Duration | ||
| next time.Duration | ||
| base time.Duration | ||
| } | ||
|
|
||
| // Exec is a helper function to exec backoff. | ||
| func (bo *BackOffer) Exec( | ||
| ctx context.Context, | ||
| fn func() error, | ||
| ) error { | ||
| if err := fn(); err != nil { | ||
| select { | ||
| case <-ctx.Done(): | ||
| case <-time.After(bo.nextInterval()): | ||
| failpoint.Inject("backOffExecute", func() { | ||
| testBackOffExecuteFlag = true | ||
| }) | ||
| } | ||
| return err | ||
| } | ||
| // reset backoff when fn() succeed. | ||
| bo.resetBackoff() | ||
| return nil | ||
| } | ||
|
|
||
| // InitialBackOffer make the initial state for retrying. | ||
| func InitialBackOffer(base, max time.Duration) BackOffer { | ||
| return BackOffer{ | ||
| max: max, | ||
| base: base, | ||
| next: base, | ||
| } | ||
| } | ||
|
|
||
| // nextInterval for now use the `exponentialInterval`. | ||
| func (bo *BackOffer) nextInterval() time.Duration { | ||
| return bo.exponentialInterval() | ||
| } | ||
|
|
||
| // exponentialInterval returns the exponential backoff duration. | ||
| func (bo *BackOffer) exponentialInterval() time.Duration { | ||
| backoffInterval := bo.next | ||
| bo.next *= 2 | ||
| if bo.next > bo.max { | ||
| bo.next = bo.max | ||
| } | ||
| return backoffInterval | ||
| } | ||
|
|
||
| // resetBackoff resets the backoff to initial state. | ||
| func (bo *BackOffer) resetBackoff() { | ||
| bo.next = bo.base | ||
| } | ||
|
|
||
| // Only used for test. | ||
| var testBackOffExecuteFlag = false | ||
|
|
||
| // TestBackOffExecute Only used for test. | ||
| func TestBackOffExecute() bool { | ||
| return testBackOffExecuteFlag | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,47 @@ | ||
| // Copyright 2023 TiKV Project Authors. | ||
| // | ||
| // 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 retry | ||
|
|
||
| import ( | ||
| "context" | ||
| "testing" | ||
| "time" | ||
|
|
||
| "github.com/pingcap/errors" | ||
| "github.com/stretchr/testify/require" | ||
| ) | ||
|
|
||
| func TestExponentialBackoff(t *testing.T) { | ||
| re := require.New(t) | ||
|
|
||
| baseBackoff := 100 * time.Millisecond | ||
| maxBackoff := 1 * time.Second | ||
|
|
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| backoff := InitialBackOffer(baseBackoff, maxBackoff) | ||
| re.Equal(backoff.nextInterval(), baseBackoff) | ||
| re.Equal(backoff.nextInterval(), 2*baseBackoff) | ||
|
|
||
| for i := 0; i < 10; i++ { | ||
| re.LessOrEqual(backoff.nextInterval(), maxBackoff) | ||
| } | ||
| re.Equal(backoff.nextInterval(), maxBackoff) | ||
|
|
||
| // Reset backoff | ||
| backoff.resetBackoff() | ||
| err := backoff.Exec(context.Background(), func() error { | ||
| return errors.New("test") | ||
| }) | ||
| re.Error(err) | ||
| } |
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