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httpstartstop_sink.go
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httpstartstop_sink.go
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/*
* Copyright 2017 Google Inc.
*
* 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 nozzle
import (
"fmt"
"code.cloudfoundry.org/lager"
"github.com/cloudfoundry-community/stackdriver-tools/src/stackdriver-nozzle/telemetry"
"github.com/cloudfoundry/sonde-go/events"
)
const httpPrefix telemetry.MetricPrefix = "app-http"
var (
requestCount *telemetry.CounterMap
responseCode *telemetry.CounterMap
defaultLabels = []string{"job", "index", "applicationPath", "instanceIndex"}
)
func init() {
requestCount = telemetry.NewCounterMap(httpPrefix, "request_count",
defaultLabels...)
responseCode = telemetry.NewCounterMap(httpPrefix, "response_code",
append(defaultLabels, "code")...)
}
type httpSink struct {
logger lager.Logger
labelMaker LabelMaker
}
// NewHTTPSink returns a Sink that can receive sonde HttpStartStop events
// and generate per-application HTTP metrics from them.
func NewHTTPSink(logger lager.Logger, labelMaker LabelMaker) Sink {
return &httpSink{
logger: logger,
labelMaker: labelMaker,
}
}
func (sink *httpSink) Receive(envelope *events.Envelope) {
if envelope.GetEventType() != events.Envelope_HttpStartStop {
return
}
labels := sink.labelMaker.MetricLabels(envelope, false)
if labels["applicationPath"] == "" {
// We're only interested in HTTP traffic passing through the gorouters
// to known applications.
return
}
labelValues := defaultLabelValues(labels)
if rcc, err := requestCount.Counter(labelValues...); err == nil {
rcc.Increment()
} else {
sink.logger.Error("httpSink.Receive", fmt.Errorf("incrementing requestCount: %v", err))
}
code := fmt.Sprintf("%d", envelope.GetHttpStartStop().GetStatusCode())
if rcc, err := responseCode.Counter(append(labelValues, code)...); err == nil {
rcc.Increment()
} else {
sink.logger.Error("httpSink.Receive", fmt.Errorf("incrementing responseCode: %v", err))
}
}
func defaultLabelValues(labels map[string]string) []string {
labelValues := make([]string, len(defaultLabels))
for i, key := range defaultLabels {
labelValues[i] = labels[key]
}
return labelValues
}