forked from googleapis/google-cloud-go
/
retry.go
104 lines (94 loc) · 3.01 KB
/
retry.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
//
// https://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 managedwriter
import (
"context"
"errors"
"io"
"strings"
"time"
"github.com/googleapis/gax-go/v2"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/status"
)
var (
defaultAppendRetries = 3
)
func newDefaultRetryer() *defaultRetryer {
return &defaultRetryer{
bigBo: gax.Backoff{
Initial: 2 * time.Second,
Multiplier: 5,
Max: 5 * time.Minute,
},
}
}
type defaultRetryer struct {
bo gax.Backoff
bigBo gax.Backoff // For more aggressive backoff, such as throughput quota
}
func (r *defaultRetryer) Retry(err error) (pause time.Duration, shouldRetry bool) {
// This predicate evaluates errors for both enqueuing and reconnection.
// See RetryAppend for retry that bounds attempts to a fixed number.
s, ok := status.FromError(err)
if !ok {
// Treat context errors as non-retriable.
if errors.Is(err, context.Canceled) || errors.Is(err, context.DeadlineExceeded) {
return r.bo.Pause(), false
}
// EOF can happen in the case of connection close.
if errors.Is(err, io.EOF) {
return r.bo.Pause(), true
}
// Any other non-status based errors treated as retryable.
return r.bo.Pause(), true
}
switch s.Code() {
case codes.Aborted,
codes.Canceled,
codes.DeadlineExceeded,
codes.Internal,
codes.Unavailable:
return r.bo.Pause(), true
case codes.ResourceExhausted:
if strings.HasPrefix(s.Message(), "Exceeds 'AppendRows throughput' quota") {
// Note: internal b/246031522 opened to give this a structured error
// and avoid string parsing. Should be a QuotaFailure or similar.
return r.bigBo.Pause(), true // more aggressive backoff
}
}
return 0, false
}
// RetryAppend is a variation of the retry predicate that also bounds retries to a finite number of attempts.
func (r *defaultRetryer) RetryAppend(err error, attemptCount int) (pause time.Duration, shouldRetry bool) {
if attemptCount > defaultAppendRetries {
return 0, false // exceeded maximum retries.
}
return r.Retry(err)
}
// shouldReconnect is akin to a retry predicate, in that it evaluates whether we should force
// our bidi stream to close/reopen based on the responses error. Errors here signal that no
// further appends will succeed.
func shouldReconnect(err error) bool {
var knownErrors = []error{
io.EOF,
status.Error(codes.Unavailable, "the connection is draining"), // errStreamDrain in gRPC transport
}
for _, ke := range knownErrors {
if errors.Is(err, ke) {
return true
}
}
return false
}