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metrics.go
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metrics.go
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// Copyright 2018 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 topics
import (
"fmt"
"net/http"
"strings"
"sync"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/prom2json"
"go.opencensus.io/stats/view"
"istio.io/pkg/ctrlz/fw"
"istio.io/pkg/ctrlz/topics/assets"
)
type metricsTopic struct{}
// MetricsTopic returns a ControlZ topic that allows visualization of process metrics.
func MetricsTopic() fw.Topic {
return metricsTopic{}
}
func (metricsTopic) Title() string {
return "Metrics"
}
func (metricsTopic) Prefix() string {
return "metric"
}
func (metricsTopic) Activate(context fw.TopicContext) {
tmpl := assets.ParseTemplate(context.Layout(), "templates/metrics.html")
_ = context.HTMLRouter().StrictSlash(true).NewRoute().Path("/").HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
fw.RenderHTML(w, tmpl, getMetricInfo())
})
_ = context.JSONRouter().StrictSlash(true).NewRoute().Path("/").HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
fw.RenderJSON(w, http.StatusOK, getMetricInfo())
})
}
func getMetricInfo() []*prom2json.Family {
families, err := prometheus.DefaultGatherer.Gather()
if err != nil {
return nil
}
result := make([]*prom2json.Family, 0, len(families))
for _, f := range families {
result = append(result, prom2json.NewFamily(f))
}
// process any OpenCensus metrics and cram 'em into promjson.* data structures
knownViewLock.Lock()
for name, v := range knownViews {
if rows, err := view.RetrieveData(name); err == nil {
family := prom2json.Family{
Name: name,
Help: v.Description,
Type: strings.ToUpper(v.Aggregation.Type.String()),
Metrics: make([]any, 0),
}
result = append(result, &family)
for _, row := range rows {
labels := make(map[string]string)
for _, tag := range row.Tags {
labels[tag.Key.Name()] = tag.Value
}
var metric any
switch d := row.Data.(type) {
case *view.LastValueData:
metric = &prom2json.Metric{
Labels: labels,
Value: fmt.Sprintf("%v", d.Value),
}
case *view.CountData:
metric = &prom2json.Metric{
Labels: labels,
Value: fmt.Sprintf("%v", d.Value),
}
case *view.SumData:
metric = &prom2json.Summary{
Labels: labels,
Sum: fmt.Sprintf("%v", d.Value),
}
}
if metric != nil {
family.Metrics = append(family.Metrics, metric)
}
}
}
}
knownViewLock.Unlock()
return result
}
type exporter struct{}
var (
knownViews = make(map[string]*view.View)
knownViewLock sync.Mutex
)
// use this to keep track of all known OpenCensus views
func (e *exporter) ExportView(vd *view.Data) {
knownViewLock.Lock()
knownViews[vd.View.Name] = vd.View
knownViewLock.Unlock()
}
func init() {
view.RegisterExporter(&exporter{})
}