mirror of https://github.com/knative/pkg.git
107 lines
2.6 KiB
Go
107 lines
2.6 KiB
Go
/*
|
|
Copyright 2018 The Knative 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 metrics
|
|
|
|
import (
|
|
"fmt"
|
|
"sync"
|
|
|
|
"go.opencensus.io/stats/view"
|
|
"go.uber.org/zap"
|
|
)
|
|
|
|
var (
|
|
curMetricsExporter view.Exporter
|
|
curMetricsConfig *metricsConfig
|
|
metricsMux sync.Mutex
|
|
)
|
|
|
|
type flushable interface {
|
|
// Flush waits for metrics to be uploaded.
|
|
Flush()
|
|
}
|
|
|
|
// newMetricsExporter gets a metrics exporter based on the config.
|
|
func newMetricsExporter(config *metricsConfig, logger *zap.SugaredLogger) (view.Exporter, error) {
|
|
// If there is a Prometheus Exporter server running, stop it.
|
|
resetCurPromSrv()
|
|
ce := getCurMetricsExporter()
|
|
if ce != nil {
|
|
// UnregisterExporter is idempotent and it can be called multiple times for the same exporter
|
|
// without side effects.
|
|
view.UnregisterExporter(ce)
|
|
}
|
|
var err error
|
|
var e view.Exporter
|
|
switch config.backendDestination {
|
|
case Stackdriver:
|
|
e, err = newStackdriverExporter(config, logger)
|
|
case Prometheus:
|
|
e, err = newPrometheusExporter(config, logger)
|
|
default:
|
|
err = fmt.Errorf("unsupported metrics backend %v", config.backendDestination)
|
|
}
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return e, nil
|
|
}
|
|
|
|
func getCurMetricsExporter() view.Exporter {
|
|
metricsMux.Lock()
|
|
defer metricsMux.Unlock()
|
|
return curMetricsExporter
|
|
}
|
|
|
|
func setCurMetricsExporter(e view.Exporter) {
|
|
metricsMux.Lock()
|
|
defer metricsMux.Unlock()
|
|
view.RegisterExporter(e)
|
|
curMetricsExporter = e
|
|
}
|
|
|
|
func getCurMetricsConfig() *metricsConfig {
|
|
metricsMux.Lock()
|
|
defer metricsMux.Unlock()
|
|
return curMetricsConfig
|
|
}
|
|
|
|
func setCurMetricsConfig(c *metricsConfig) {
|
|
metricsMux.Lock()
|
|
defer metricsMux.Unlock()
|
|
if c != nil {
|
|
view.SetReportingPeriod(c.reportingPeriod)
|
|
} else {
|
|
// Setting to 0 enables the default behavior.
|
|
view.SetReportingPeriod(0)
|
|
}
|
|
curMetricsConfig = c
|
|
}
|
|
|
|
// FlushExporter waits for exported data to be uploaded.
|
|
// This should be called before the process shuts down or exporter is replaced.
|
|
// Return value indicates whether the exporter is flushable or not.
|
|
func FlushExporter() bool {
|
|
e := getCurMetricsExporter()
|
|
if e == nil {
|
|
return false
|
|
}
|
|
|
|
if f, ok := e.(flushable); ok {
|
|
f.Flush()
|
|
return true
|
|
}
|
|
return false
|
|
}
|