| // 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" |
| ) |
| |
| import ( |
| ocprom "contrib.go.opencensus.io/exporter/prometheus" |
| "github.com/prometheus/client_golang/prometheus" |
| "go.opencensus.io/stats/view" |
| "istio.io/pkg/log" |
| "istio.io/pkg/monitoring" |
| "istio.io/pkg/version" |
| ) |
| |
| type monitor struct { |
| monitoringServer *http.Server |
| } |
| |
| const ( |
| metricsPath = "/metrics" |
| versionPath = "/version" |
| ) |
| |
| var ( |
| serverStart = time.Now() |
| |
| uptime = monitoring.NewDerivedGauge( // nolint: deadcode, varcheck |
| "istiod_uptime_seconds", |
| "Current istiod server uptime in seconds", |
| ) |
| ) |
| |
| func init() { |
| uptime.ValueFrom(func() float64 { |
| return time.Since(serverStart).Seconds() |
| }) |
| } |
| |
| 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, 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(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 |
| } |