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bufferedClient.go
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bufferedClient.go
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// Copyright 2017 Istio 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 metric
import (
"context"
"fmt"
"io"
"sync"
"time"
monitoringpb "google.golang.org/genproto/googleapis/monitoring/v3"
"istio.io/istio/mixer/pkg/adapter"
)
// Abstracts over the specific impl for testing.
type bufferedClient interface {
io.Closer
Record([]*monitoringpb.TimeSeries)
}
// A wrapper around the stackdriver client SDK that handles batching data before sending.
// TODO: implement size based batching, today we only send batches on a time.Ticker's tick and we don't watch how much data we're storing.
type buffered struct {
project string
pushMetrics pushFunc
l adapter.Logger
closeMe io.Closer
// Guards buffer
m sync.Mutex
buffer []*monitoringpb.TimeSeries
}
func (b *buffered) start(env adapter.Env, ticker *time.Ticker) {
env.ScheduleDaemon(func() {
for range ticker.C {
b.Send()
}
})
}
func (b *buffered) Record(toSend []*monitoringpb.TimeSeries) {
b.m.Lock()
b.buffer = append(b.buffer, toSend...)
// TODO: gauge metric reporting how many bytes/timeseries we're holding right now
b.m.Unlock()
}
func (b *buffered) Send() {
b.m.Lock()
if len(b.buffer) == 0 {
b.m.Unlock()
b.l.Infof("No data to send to Stackdriver.")
return
}
toSend := b.buffer
b.buffer = make([]*monitoringpb.TimeSeries, 0, len(toSend))
b.m.Unlock()
merged := merge(toSend, b.l)
err := b.pushMetrics(context.Background(),
&monitoringpb.CreateTimeSeriesRequest{
Name: fmt.Sprintf("projects/%s", b.project),
TimeSeries: merged,
})
// TODO: this is executed in a daemon, so we can't get out info about errors other than logging.
// We need to build framework level support for these kinds of async tasks. Perhaps a generic batching adapter
// can handle some of this complexity?
if err != nil {
_ = b.l.Errorf("Stackdriver returned: %v\nGiven data: %v", err, merged)
} else {
b.l.Infof("Successfully sent data to Stackdriver.")
}
}
func (b *buffered) Close() error {
b.l.Infof("Sending last data before shutting down")
b.Send()
return b.closeMe.Close()
}