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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 (
"html/template"
"net/http"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/prom2json"
"istio.io/istio/pkg/ctrlz/fw"
)
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 := template.Must(context.Layout().Parse(string(MustAsset("assets/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))
}
return result
}