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monitoring.go
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monitoring.go
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// Copyright 2017 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 bootstrap
import (
"fmt"
"net"
"net/http"
"github.com/prometheus/client_golang/prometheus"
ocprom "go.opencensus.io/exporter/prometheus"
"go.opencensus.io/stats/view"
"istio.io/istio/pkg/log"
"istio.io/istio/pkg/version"
)
type monitor struct {
monitoringServer *http.Server
shutdown chan struct{}
}
const (
metricsPath = "/metrics"
versionPath = "/version"
)
func addMonitor(mux *http.ServeMux) error {
exporter, err := ocprom.NewExporter(ocprom.Options{Registry: prometheus.DefaultRegisterer.(*prometheus.Registry)})
if err != nil {
return fmt.Errorf("could not set up prometheus exporter: %v", err)
}
view.RegisterExporter(exporter)
mux.Handle(metricsPath, exporter)
mux.HandleFunc(versionPath, func(out http.ResponseWriter, req *http.Request) {
if _, err := out.Write([]byte(version.Info.String())); err != nil {
log.Errorf("Unable to write version string: %v", err)
}
})
return nil
}
// Deprecated: we shouldn't have 2 http ports. Will be removed after code using
// this port is removed.
func startMonitor(addr string, mux *http.ServeMux) (*monitor, net.Addr, error) {
m := &monitor{
shutdown: make(chan struct{}),
}
// get the network stuff setup
var listener net.Listener
var err error
if listener, err = net.Listen("tcp", addr); err != nil {
return nil, nil, fmt.Errorf("unable to listen on socket: %v", err)
}
// NOTE: this is a temporary solution to provide bare-bones debug functionality
// for pilot. a full design / implementation of self-monitoring and reporting
// is coming. that design will include proper coverage of statusz/healthz type
// functionality, in addition to how pilot reports its own metrics.
if err = addMonitor(mux); err != nil {
return nil, nil, fmt.Errorf("could not establish self-monitoring: %v", err)
}
m.monitoringServer = &http.Server{
Handler: mux,
}
version.Info.RecordComponentBuildTag("pilot")
go func() {
m.shutdown <- struct{}{}
_ = m.monitoringServer.Serve(listener)
m.shutdown <- struct{}{}
}()
// This is here to work around (mostly) a race condition in the Serve
// function. If the Close method is called before or during the execution of
// Serve, the call may be ignored and Serve never returns.
<-m.shutdown
return m, listener.Addr(), nil
}
func (m *monitor) Close() error {
err := m.monitoringServer.Close()
<-m.shutdown
return err
}