forked from coredns/coredns
/
pprof.go
60 lines (50 loc) · 1.29 KB
/
pprof.go
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// Package pprof implements a debug endpoint for getting profiles using the
// go pprof tooling.
package pprof
import (
"net"
"net/http"
pp "net/http/pprof"
"runtime"
"github.com/coredns/coredns/plugin/pkg/reuseport"
)
type handler struct {
addr string
rateBloc int
ln net.Listener
mux *http.ServeMux
}
func (h *handler) Startup() error {
// Reloading the plugin without changing the listening address results
// in an error unless we reuse the port because Startup is called for
// new handlers before Shutdown is called for the old ones.
ln, err := reuseport.Listen("tcp", h.addr)
if err != nil {
log.Errorf("Failed to start pprof handler: %s", err)
return err
}
h.ln = ln
h.mux = http.NewServeMux()
h.mux.HandleFunc(path, func(rw http.ResponseWriter, req *http.Request) {
http.Redirect(rw, req, path+"/", http.StatusFound)
})
h.mux.HandleFunc(path+"/", pp.Index)
h.mux.HandleFunc(path+"/cmdline", pp.Cmdline)
h.mux.HandleFunc(path+"/profile", pp.Profile)
h.mux.HandleFunc(path+"/symbol", pp.Symbol)
h.mux.HandleFunc(path+"/trace", pp.Trace)
runtime.SetBlockProfileRate(h.rateBloc)
go func() {
http.Serve(h.ln, h.mux)
}()
return nil
}
func (h *handler) Shutdown() error {
if h.ln != nil {
return h.ln.Close()
}
return nil
}
const (
path = "/debug/pprof"
)