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restic/vendor/cloud.google.com/go/pubsub/go18.go

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// Copyright 2018 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.
// +build go1.8
package pubsub
import (
"log"
"sync"
"go.opencensus.io/plugin/ocgrpc"
"go.opencensus.io/stats"
"go.opencensus.io/stats/view"
"go.opencensus.io/tag"
"golang.org/x/net/context"
"google.golang.org/api/option"
"google.golang.org/grpc"
)
func openCensusOptions() []option.ClientOption {
return []option.ClientOption{
option.WithGRPCDialOption(grpc.WithStatsHandler(&ocgrpc.ClientHandler{})),
}
}
var subscriptionKey tag.Key
func init() {
var err error
if subscriptionKey, err = tag.NewKey("subscription"); err != nil {
log.Fatal("cannot create 'subscription' key")
}
}
var (
// PullCount is a measure of the number of messages pulled.
// It is EXPERIMENTAL and subject to change or removal without notice.
PullCount *stats.Int64Measure
// AckCount is a measure of the number of messages acked.
// It is EXPERIMENTAL and subject to change or removal without notice.
AckCount *stats.Int64Measure
// NackCount is a measure of the number of messages nacked.
// It is EXPERIMENTAL and subject to change or removal without notice.
NackCount *stats.Int64Measure
// ModAckCount is a measure of the number of messages whose ack-deadline was modified.
// It is EXPERIMENTAL and subject to change or removal without notice.
ModAckCount *stats.Int64Measure
// StreamOpenCount is a measure of the number of times a streaming-pull stream was opened.
// It is EXPERIMENTAL and subject to change or removal without notice.
StreamOpenCount *stats.Int64Measure
// StreamRetryCount is a measure of the number of times a streaming-pull operation was retried.
// It is EXPERIMENTAL and subject to change or removal without notice.
StreamRetryCount *stats.Int64Measure
// StreamRequestCount is a measure of the number of requests sent on a streaming-pull stream.
// It is EXPERIMENTAL and subject to change or removal without notice.
StreamRequestCount *stats.Int64Measure
// StreamRequestCount is a measure of the number of responses received on a streaming-pull stream.
// It is EXPERIMENTAL and subject to change or removal without notice.
StreamResponseCount *stats.Int64Measure
// PullCountView is a cumulative sum of PullCount.
// It is EXPERIMENTAL and subject to change or removal without notice.
PullCountView *view.View
// AckCountView is a cumulative sum of AckCount.
// It is EXPERIMENTAL and subject to change or removal without notice.
AckCountView *view.View
// NackCountView is a cumulative sum of NackCount.
// It is EXPERIMENTAL and subject to change or removal without notice.
NackCountView *view.View
// ModAckCountView is a cumulative sum of ModAckCount.
// It is EXPERIMENTAL and subject to change or removal without notice.
ModAckCountView *view.View
// StreamOpenCountView is a cumulative sum of StreamOpenCount.
// It is EXPERIMENTAL and subject to change or removal without notice.
StreamOpenCountView *view.View
// StreamRetryCountView is a cumulative sum of StreamRetryCount.
// It is EXPERIMENTAL and subject to change or removal without notice.
StreamRetryCountView *view.View
// StreamRequestCountView is a cumulative sum of StreamRequestCount.
// It is EXPERIMENTAL and subject to change or removal without notice.
StreamRequestCountView *view.View
// StreamResponseCountView is a cumulative sum of StreamResponseCount.
// It is EXPERIMENTAL and subject to change or removal without notice.
StreamResponseCountView *view.View
)
const statsPrefix = "cloud.google.com/go/pubsub/"
func init() {
PullCount = mustNewMeasure("pull_count", "Number of PubSub messages pulled")
AckCount = mustNewMeasure("ack_count", "Number of PubSub messages acked")
NackCount = mustNewMeasure("nack_count", "Number of PubSub messages nacked")
ModAckCount = mustNewMeasure("mod_ack_count", "Number of ack-deadlines modified")
StreamOpenCount = mustNewMeasure("stream_open_count", "Number of calls opening a new streaming pull")
StreamRetryCount = mustNewMeasure("stream_retry_count", "Number of retries of a stream send or receive")
StreamRequestCount = mustNewMeasure("stream_request_count", "Number gRPC StreamingPull request messages sent")
StreamResponseCount = mustNewMeasure("stream_response_count", "Number of gRPC StreamingPull response messages received")
PullCountView = mustNewView(PullCount)
AckCountView = mustNewView(AckCount)
NackCountView = mustNewView(NackCount)
ModAckCountView = mustNewView(ModAckCount)
StreamOpenCountView = mustNewView(StreamOpenCount)
StreamRetryCountView = mustNewView(StreamRetryCount)
StreamRequestCountView = mustNewView(StreamRequestCount)
StreamResponseCountView = mustNewView(StreamResponseCount)
}
func mustNewMeasure(name, desc string) *stats.Int64Measure {
const unitCount = "1"
name = statsPrefix + name
m, err := stats.Int64(name, desc, unitCount)
if err != nil {
log.Fatalf("creating %q: %v", name, err)
}
return m
}
func mustNewView(m *stats.Int64Measure) *view.View {
v, err := view.New(m.Name(), "cumulative "+m.Description(),
[]tag.Key{subscriptionKey}, m, view.Sum())
if err != nil {
log.Fatalf("creating view for %q: %v", m.Name(), err)
}
return v
}
var logOnce sync.Once
func withSubscriptionKey(ctx context.Context, subName string) context.Context {
ctx, err := tag.New(ctx, tag.Upsert(subscriptionKey, subName))
if err != nil {
logOnce.Do(func() {
log.Printf("pubsub: error creating tag map: %v", err)
})
}
return ctx
}
func recordStat(ctx context.Context, m *stats.Int64Measure, n int64) {
stats.Record(ctx, m.M(n))
}