mirror of
https://github.com/stefanprodan/podinfo.git
synced 2026-03-03 10:30:19 +00:00
134 lines
3.2 KiB
Go
134 lines
3.2 KiB
Go
package server
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import (
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"context"
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"net/http"
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"net/http/pprof"
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"os"
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"runtime"
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"sync/atomic"
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"time"
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"github.com/prometheus/client_golang/prometheus/promhttp"
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"github.com/rs/zerolog/log"
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"github.com/stefanprodan/k8s-podinfo/pkg/fscache"
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)
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var (
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healthy int32
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ready int32
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dataPath string
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watcher *fscache.Watcher
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)
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type Server struct {
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mux *http.ServeMux
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}
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func NewServer(options ...func(*Server)) *Server {
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s := &Server{mux: http.NewServeMux()}
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for _, f := range options {
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f(s)
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}
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s.mux.HandleFunc("/", s.index)
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s.mux.HandleFunc("/healthz", s.healthz)
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s.mux.HandleFunc("/readyz", s.readyz)
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s.mux.HandleFunc("/readyz/enable", s.enable)
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s.mux.HandleFunc("/readyz/disable", s.disable)
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s.mux.HandleFunc("/echo", s.echo)
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s.mux.HandleFunc("/echoheaders", s.echoHeaders)
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s.mux.HandleFunc("/backend", s.backend)
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s.mux.HandleFunc("/job", s.job)
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s.mux.HandleFunc("/read", s.read)
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s.mux.HandleFunc("/write", s.write)
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s.mux.HandleFunc("/error", s.error)
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s.mux.HandleFunc("/panic", s.panic)
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s.mux.HandleFunc("/configs", s.configs)
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s.mux.HandleFunc("/version", s.version)
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s.mux.Handle("/metrics", promhttp.Handler())
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// Register pprof handlers
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s.mux.HandleFunc("/debug/pprof/", pprof.Index)
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s.mux.HandleFunc("/debug/pprof/cmdline", pprof.Cmdline)
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s.mux.HandleFunc("/debug/pprof/profile", pprof.Profile)
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s.mux.HandleFunc("/debug/pprof/symbol", pprof.Symbol)
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s.mux.HandleFunc("/debug/pprof/trace", pprof.Trace)
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// API
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s.mux.HandleFunc("/api/info", s.apiInfo)
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s.mux.HandleFunc("/api/echo", s.apiEcho)
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return s
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}
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func (s *Server) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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w.Header().Set("Server", runtime.Version())
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s.mux.ServeHTTP(w, r)
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}
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func ListenAndServe(port string, timeout time.Duration, stopCh <-chan struct{}) {
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inst := NewInstrument()
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srv := &http.Server{
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Addr: ":" + port,
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Handler: inst.Wrap(NewServer()),
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ReadTimeout: 5 * time.Second,
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WriteTimeout: 1 * time.Minute,
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IdleTimeout: 15 * time.Second,
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}
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atomic.StoreInt32(&healthy, 1)
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atomic.StoreInt32(&ready, 1)
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// local storage path
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dataPath = os.Getenv("data")
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if len(dataPath) < 1 {
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dataPath = "/data"
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}
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// config path
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configPath := os.Getenv("configPath")
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if len(configPath) > 0 {
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var err error
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watcher, err = fscache.NewWatch(configPath)
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if err != nil {
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log.Error().Err(err).Msgf("%s watch error", configPath)
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} else {
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watcher.Watch()
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}
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}
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// run server in background
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go func() {
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if err := srv.ListenAndServe(); err != http.ErrServerClosed {
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log.Fatal().Err(err).Msg("HTTP server crashed")
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}
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}()
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// wait for SIGTERM or SIGINT
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<-stopCh
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ctx, cancel := context.WithTimeout(context.Background(), timeout)
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defer cancel()
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// all calls to /healthz and /readyz will fail from now on
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atomic.StoreInt32(&healthy, 0)
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atomic.StoreInt32(&ready, 0)
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log.Info().Msgf("Shutting down HTTP server with timeout: %v", timeout)
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// wait for Kubernetes readiness probe
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// to remove this instance from the load balancer
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// the readiness check interval must lower than the timeout
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time.Sleep(timeout)
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// attempt graceful shutdown
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if err := srv.Shutdown(ctx); err != nil {
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log.Error().Err(err).Msg("HTTP server graceful shutdown failed")
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} else {
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log.Info().Msg("HTTP server stopped")
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}
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}
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