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stats_reporter.go
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/
stats_reporter.go
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/*
* Copyright 2020 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 filter
import (
"context"
"log"
"strconv"
"time"
"go.opencensus.io/stats"
"go.opencensus.io/stats/view"
"go.opencensus.io/tag"
"knative.dev/eventing/pkg/broker"
"knative.dev/pkg/metrics"
"knative.dev/pkg/metrics/metricskey"
)
const (
// anyValue is the default value if the trigger filter attributes are empty.
anyValue = "any"
)
var (
// eventCountM is a counter which records the number of events received
// by a Trigger.
eventCountM = stats.Int64(
"event_count",
"Number of events received by a Trigger",
stats.UnitDimensionless,
)
// dispatchTimeInMsecM records the time spent dispatching an event to
// a Trigger subscriber, in milliseconds.
dispatchTimeInMsecM = stats.Float64(
"event_dispatch_latencies",
"The time spent dispatching an event to a Trigger subscriber",
stats.UnitMilliseconds,
)
// processingTimeInMsecM records the time spent between arrival at the Broker
// and the delivery to the Trigger subscriber.
processingTimeInMsecM = stats.Float64(
"event_processing_latencies",
"The time spent processing an event before it is dispatched to a Trigger subscriber",
stats.UnitMilliseconds,
)
// Create the tag keys that will be used to add tags to our measurements.
// Tag keys must conform to the restrictions described in
// go.opencensus.io/tag/validate.go. Currently those restrictions are:
// - length between 1 and 255 inclusive
// - characters are printable US-ASCII
namespaceKey = tag.MustNewKey(metricskey.LabelNamespaceName)
triggerKey = tag.MustNewKey(metricskey.LabelTriggerName)
brokerKey = tag.MustNewKey(metricskey.LabelBrokerName)
triggerFilterTypeKey = tag.MustNewKey(metricskey.LabelFilterType)
responseCodeKey = tag.MustNewKey(metricskey.LabelResponseCode)
responseCodeClassKey = tag.MustNewKey(metricskey.LabelResponseCodeClass)
)
type ReportArgs struct {
ns string
trigger string
broker string
filterType string
}
func init() {
register()
}
// StatsReporter defines the interface for sending filter metrics.
type StatsReporter interface {
ReportEventCount(args *ReportArgs, responseCode int) error
ReportEventDispatchTime(args *ReportArgs, responseCode int, d time.Duration) error
ReportEventProcessingTime(args *ReportArgs, d time.Duration) error
}
var _ StatsReporter = (*reporter)(nil)
var emptyContext = context.Background()
// reporter holds cached metric objects to report filter metrics.
type reporter struct {
container string
uniqueName string
}
// NewStatsReporter creates a reporter that collects and reports filter metrics.
func NewStatsReporter(container, uniqueName string) StatsReporter {
return &reporter{
container: container,
uniqueName: uniqueName,
}
}
func register() {
// Create view to see our measurements.
err := view.Register(
&view.View{
Description: eventCountM.Description(),
Measure: eventCountM,
Aggregation: view.Count(),
TagKeys: []tag.Key{namespaceKey, triggerKey, brokerKey, triggerFilterTypeKey, responseCodeKey, responseCodeClassKey, broker.UniqueTagKey, broker.ContainerTagKey},
},
&view.View{
Description: dispatchTimeInMsecM.Description(),
Measure: dispatchTimeInMsecM,
Aggregation: view.Distribution(metrics.Buckets125(1, 10000)...), // 1, 2, 5, 10, 20, 50, 100, 1000, 5000, 10000
TagKeys: []tag.Key{namespaceKey, triggerKey, brokerKey, triggerFilterTypeKey, responseCodeKey, responseCodeClassKey, broker.UniqueTagKey, broker.ContainerTagKey},
},
&view.View{
Description: processingTimeInMsecM.Description(),
Measure: processingTimeInMsecM,
Aggregation: view.Distribution(metrics.Buckets125(1, 10000)...), // 1, 2, 5, 10, 20, 50, 100, 1000, 5000, 10000
TagKeys: []tag.Key{namespaceKey, triggerKey, brokerKey, triggerFilterTypeKey, broker.UniqueTagKey, broker.ContainerTagKey},
},
)
if err != nil {
log.Printf("failed to register opencensus views, %s", err)
}
}
// ReportEventCount captures the event count.
func (r *reporter) ReportEventCount(args *ReportArgs, responseCode int) error {
ctx, err := r.generateTag(args,
tag.Insert(responseCodeKey, strconv.Itoa(responseCode)),
tag.Insert(responseCodeClassKey, metrics.ResponseCodeClass(responseCode)))
if err != nil {
return err
}
metrics.Record(ctx, eventCountM.M(1))
return nil
}
// ReportEventDispatchTime captures dispatch times.
func (r *reporter) ReportEventDispatchTime(args *ReportArgs, responseCode int, d time.Duration) error {
ctx, err := r.generateTag(args,
tag.Insert(responseCodeKey, strconv.Itoa(responseCode)),
tag.Insert(responseCodeClassKey, metrics.ResponseCodeClass(responseCode)))
if err != nil {
return err
}
// convert time.Duration in nanoseconds to milliseconds.
metrics.Record(ctx, dispatchTimeInMsecM.M(float64(d/time.Millisecond)))
return nil
}
// ReportEventProcessingTime captures event processing times.
func (r *reporter) ReportEventProcessingTime(args *ReportArgs, d time.Duration) error {
ctx, err := r.generateTag(args)
if err != nil {
return err
}
// convert time.Duration in nanoseconds to milliseconds.
metrics.Record(ctx, processingTimeInMsecM.M(float64(d/time.Millisecond)))
return nil
}
func (r *reporter) generateTag(args *ReportArgs, tags ...tag.Mutator) (context.Context, error) {
// Note that filterType and filterSource can be empty strings, so they need a special treatment.
ctx, err := tag.New(
emptyContext,
tag.Insert(broker.ContainerTagKey, r.container),
tag.Insert(broker.UniqueTagKey, r.uniqueName),
tag.Insert(namespaceKey, args.ns),
tag.Insert(triggerKey, args.trigger),
tag.Insert(brokerKey, args.broker),
tag.Insert(triggerFilterTypeKey, valueOrAny(args.filterType)))
if err != nil {
return nil, err
}
for _, t := range tags {
ctx, err = tag.New(ctx, t)
if err != nil {
return nil, err
}
}
return ctx, err
}
func valueOrAny(v string) string {
if v != "" {
return v
}
return anyValue
}