mirror of https://github.com/knative/caching.git
132 lines
3.6 KiB
Go
132 lines
3.6 KiB
Go
/*
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* Copyright 2019 The Knative Authors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package source
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import (
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"context"
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"strconv"
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"go.opencensus.io/stats/view"
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"knative.dev/pkg/metrics"
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"go.opencensus.io/stats"
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"go.opencensus.io/tag"
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"knative.dev/pkg/metrics/metricskey"
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)
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var (
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// eventCountM is a counter which records the number of events sent by the source.
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eventCountM = stats.Int64(
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"event_count",
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"Number of events sent",
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stats.UnitDimensionless,
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)
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// Create the tag keys that will be used to add tags to our measurements.
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// Tag keys must conform to the restrictions described in
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// go.opencensus.io/tag/validate.go. Currently those restrictions are:
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// - length between 1 and 255 inclusive
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// - characters are printable US-ASCII
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namespaceKey = tag.MustNewKey(metricskey.LabelNamespaceName)
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eventSourceKey = tag.MustNewKey(metricskey.LabelEventSource)
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eventTypeKey = tag.MustNewKey(metricskey.LabelEventType)
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sourceNameKey = tag.MustNewKey(metricskey.LabelSourceName)
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sourceResourceGroupKey = tag.MustNewKey(metricskey.LabelSourceResourceGroup)
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responseCodeKey = tag.MustNewKey(metricskey.LabelResponseCode)
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responseCodeClassKey = tag.MustNewKey(metricskey.LabelResponseCodeClass)
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)
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type ReportArgs struct {
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Namespace string
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EventType string
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EventSource string
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Name string
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ResourceGroup string
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}
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func init() {
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register()
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}
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// StatsReporter defines the interface for sending source metrics.
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type StatsReporter interface {
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// ReportEventCount captures the event count. It records one per call.
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ReportEventCount(args *ReportArgs, responseCode int) error
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}
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var _ StatsReporter = (*reporter)(nil)
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// reporter holds cached metric objects to report source metrics.
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type reporter struct {
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ctx context.Context
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}
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// NewStatsReporter creates a reporter that collects and reports source metrics.
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func NewStatsReporter() (StatsReporter, error) {
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ctx, err := tag.New(
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context.Background(),
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)
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if err != nil {
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return nil, err
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}
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return &reporter{ctx: ctx}, nil
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}
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func (r *reporter) ReportEventCount(args *ReportArgs, responseCode int) error {
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ctx, err := r.generateTag(args, responseCode)
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if err != nil {
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return err
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}
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metrics.Record(ctx, eventCountM.M(1))
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return nil
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}
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func (r *reporter) generateTag(args *ReportArgs, responseCode int) (context.Context, error) {
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return tag.New(
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r.ctx,
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tag.Insert(namespaceKey, args.Namespace),
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tag.Insert(eventSourceKey, args.EventSource),
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tag.Insert(eventTypeKey, args.EventType),
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tag.Insert(sourceNameKey, args.Name),
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tag.Insert(sourceResourceGroupKey, args.ResourceGroup),
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tag.Insert(responseCodeKey, strconv.Itoa(responseCode)),
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tag.Insert(responseCodeClassKey, metrics.ResponseCodeClass(responseCode)))
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}
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func register() {
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tagKeys := []tag.Key{
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namespaceKey,
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eventSourceKey,
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eventTypeKey,
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sourceNameKey,
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sourceResourceGroupKey,
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responseCodeKey,
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responseCodeClassKey}
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// Create view to see our measurements.
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if err := view.Register(
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&view.View{
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Description: eventCountM.Description(),
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Measure: eventCountM,
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Aggregation: view.Count(),
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TagKeys: tagKeys,
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},
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); err != nil {
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panic(err)
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}
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}
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