/
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 server
import (
"context"
"fmt"
"net"
"net/http"
"net/http/pprof"
"time"
"github.com/prometheus/client_golang/prometheus"
ocprom "go.opencensus.io/exporter/prometheus"
"go.opencensus.io/stats/view"
"google.golang.org/grpc/stats"
"istio.io/istio/pkg/log"
"istio.io/istio/pkg/version"
)
type monitor struct {
monitoringServer *http.Server
// This channel is closed after the server stops serving requests.
closed chan struct{}
}
const (
metricsPath = "/metrics"
versionPath = "/version"
)
func startMonitor(port uint16, enableProfiling bool, lf listenFunc) (*monitor, error) {
m := &monitor{
closed: make(chan struct{}),
}
// get the network stuff setup
var listener net.Listener
var err error
if listener, err = lf("tcp", fmt.Sprintf(":%d", port)); 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 mixer. 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 mixer reports its own metrics.
mux := http.NewServeMux()
registry := prometheus.NewRegistry()
registry.MustRegister(prometheus.NewProcessCollector(prometheus.ProcessCollectorOpts{}))
registry.MustRegister(prometheus.NewGoCollector())
exporter, err := ocprom.NewExporter(ocprom.Options{Registry: registry})
if err != nil {
return nil, 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)
}
})
version.Info.RecordComponentBuildTag("mixer")
if enableProfiling {
mux.HandleFunc("/debug/pprof/", pprof.Index)
mux.HandleFunc("/debug/pprof/cmdline", pprof.Cmdline)
mux.HandleFunc("/debug/pprof/profile", pprof.Profile)
mux.HandleFunc("/debug/pprof/symbol", pprof.Symbol)
mux.HandleFunc("/debug/pprof/trace", pprof.Trace)
}
m.monitoringServer = &http.Server{
Handler: mux,
}
go func() {
_ = m.monitoringServer.Serve(listener)
close(m.closed)
}()
return m, nil
}
func (m *monitor) Close() error {
var err error
// This works around a race condition between Serve() and Close() functions.
// If Close() is called before Serve(), Serve() never returns.
// m.closed channel is used by Serve() to indicate that is has processed the Close signal
// and exited the function. Until Serve() exists, Close() periodically issues monitoringServer.Close().
L:
for {
err = m.monitoringServer.Close()
select {
case <-m.closed:
break L
default:
time.Sleep(20 * time.Millisecond)
}
}
return err
}
type multiStatsHandler struct {
handlers []stats.Handler
}
// HandleRPC processes the RPC stats.
func (m *multiStatsHandler) HandleRPC(ctx context.Context, rs stats.RPCStats) {
for _, h := range m.handlers {
h.HandleRPC(ctx, rs)
}
}
// TagRPC can attach some information to the given context.
func (m *multiStatsHandler) TagRPC(ctx context.Context, rti *stats.RPCTagInfo) context.Context {
c := ctx
for _, h := range m.handlers {
c = h.TagRPC(c, rti)
}
return c
}
// TagConn can attach some information to the given context.
func (m *multiStatsHandler) TagConn(ctx context.Context, cti *stats.ConnTagInfo) context.Context {
c := ctx
for _, h := range m.handlers {
c = h.TagConn(c, cti)
}
return c
}
// HandleConn processes the Conn stats.
func (m *multiStatsHandler) HandleConn(ctx context.Context, cs stats.ConnStats) {
for _, h := range m.handlers {
h.HandleConn(ctx, cs)
}
}
func newMultiStatsHandler(handlers ...stats.Handler) stats.Handler {
return &multiStatsHandler{handlers: handlers}
}