mirror of
https://github.com/Luzifer/nginx-sso.git
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107 lines
3.3 KiB
Go
107 lines
3.3 KiB
Go
// Copyright 2016 Google LLC
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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 pubsub
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import (
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"fmt"
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"math"
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"strings"
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"time"
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gax "github.com/googleapis/gax-go/v2"
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pb "google.golang.org/genproto/googleapis/pubsub/v1"
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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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// maxPayload is the maximum number of bytes to devote to actual ids in
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// acknowledgement or modifyAckDeadline requests. A serialized
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// AcknowledgeRequest proto has a small constant overhead, plus the size of the
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// subscription name, plus 3 bytes per ID (a tag byte and two size bytes). A
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// ModifyAckDeadlineRequest has an additional few bytes for the deadline. We
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// don't know the subscription name here, so we just assume the size exclusive
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// of ids is 100 bytes.
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//
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// With gRPC there is no way for the client to know the server's max message size (it is
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// configurable on the server). We know from experience that it
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// it 512K.
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const (
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maxPayload = 512 * 1024
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reqFixedOverhead = 100
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overheadPerID = 3
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maxSendRecvBytes = 20 * 1024 * 1024 // 20M
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)
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func convertMessages(rms []*pb.ReceivedMessage) ([]*Message, error) {
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msgs := make([]*Message, 0, len(rms))
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for i, m := range rms {
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msg, err := toMessage(m)
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if err != nil {
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return nil, fmt.Errorf("pubsub: cannot decode the retrieved message at index: %d, message: %+v", i, m)
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}
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msgs = append(msgs, msg)
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}
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return msgs, nil
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}
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func trunc32(i int64) int32 {
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if i > math.MaxInt32 {
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i = math.MaxInt32
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}
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return int32(i)
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}
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type defaultRetryer struct {
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bo gax.Backoff
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}
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// Logic originally from
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// https://github.com/GoogleCloudPlatform/google-cloud-java/blob/master/google-cloud-clients/google-cloud-pubsub/src/main/java/com/google/cloud/pubsub/v1/StatusUtil.java
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func (r *defaultRetryer) Retry(err error) (pause time.Duration, shouldRetry bool) {
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s, ok := status.FromError(err)
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if !ok { // includes io.EOF, normal stream close, which causes us to reopen
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return r.bo.Pause(), true
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}
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switch s.Code() {
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case codes.DeadlineExceeded, codes.Internal, codes.ResourceExhausted, codes.Aborted:
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return r.bo.Pause(), true
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case codes.Unavailable:
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c := strings.Contains(s.Message(), "Server shutdownNow invoked")
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if !c {
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return r.bo.Pause(), true
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}
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return 0, false
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default:
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return 0, false
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}
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}
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type streamingPullRetryer struct {
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defaultRetryer gax.Retryer
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}
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// Does not retry ResourceExhausted. See: https://github.com/GoogleCloudPlatform/google-cloud-go/issues/1166#issuecomment-443744705
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func (r *streamingPullRetryer) Retry(err error) (pause time.Duration, shouldRetry bool) {
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s, ok := status.FromError(err)
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if !ok { // call defaultRetryer so that its backoff can be used
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return r.defaultRetryer.Retry(err)
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}
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switch s.Code() {
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case codes.ResourceExhausted:
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return 0, false
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default:
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return r.defaultRetryer.Retry(err)
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}
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}
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