/
monitoring.go
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/
monitoring.go
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// Copyright 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"
"time"
"istio.io/istio/pkg/log"
"istio.io/istio/pkg/monitoring"
"istio.io/istio/pkg/version"
)
type monitor struct {
monitoringServer *http.Server
}
const (
metricsPath = "/metrics"
versionPath = "/version"
)
var (
serverStart = time.Now()
_ = monitoring.NewDerivedGauge(
"istiod_uptime_seconds",
"Current istiod server uptime in seconds",
).ValueFrom(func() float64 {
return time.Since(serverStart).Seconds()
})
versionTag = monitoring.CreateLabel("version")
pilotVersion = monitoring.NewGauge(
"pilot_info",
"Pilot version and build information.",
)
)
func init() {
pilotVersion.With(versionTag.Value(version.Info.String())).Record(1)
}
func addMonitor(mux *http.ServeMux) error {
exporter, err := monitoring.RegisterPrometheusExporter(nil, nil)
if err != nil {
return fmt.Errorf("could not set up prometheus exporter: %v", err)
}
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, error) {
m := &monitor{}
// get the network stuff setup
var listener net.Listener
if addr != "" {
var err error
if listener, err = net.Listen("tcp", addr); err != nil {
return 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, fmt.Errorf("could not establish self-monitoring: %v", err)
}
if addr != "" {
m.monitoringServer = &http.Server{
Addr: listener.Addr().String(),
Handler: mux,
IdleTimeout: 90 * time.Second, // matches http.DefaultTransport keep-alive timeout
ReadTimeout: 30 * time.Second,
}
}
version.Info.RecordComponentBuildTag("pilot")
if addr != "" {
go func() {
_ = m.monitoringServer.Serve(listener)
}()
}
return m, nil
}
func (m *monitor) Close() error {
if m.monitoringServer != nil {
return m.monitoringServer.Close()
}
return nil
}
// initMonitor initializes the configuration for the pilot monitoring server.
func (s *Server) initMonitor(addr string) error { // nolint: unparam
s.addStartFunc("monitoring", func(stop <-chan struct{}) error {
monitor, err := startMonitor(addr, s.monitoringMux)
if err != nil {
return err
}
go func() {
<-stop
err := monitor.Close()
log.Debugf("Monitoring server terminated: %v", err)
}()
return nil
})
return nil
}