f91c55d6cd
* Fix reloading in plugin/pprof.
Reloading the server without changing the listen address results in an
error because Startup is called for newly set up plugins before Shutdown
is called for the old ones.
Signed-off-by: Gonzalo Paniagua Javier <gonzalo.mono@gmail.com>
* Use pkg/reuseport when listening.
Use coredns' newly added reuseport.
Signed-off-by: Gonzalo Paniagua Javier <gonzalo.mono@gmail.com>
* Revert go.{mod,sum} changes.
Signed-off-by: Gonzalo Paniagua Javier <gonzalo.mono@gmail.com>
57 lines
1.2 KiB
Go
57 lines
1.2 KiB
Go
// Package pprof implements a debug endpoint for getting profiles using the
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// go pprof tooling.
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package pprof
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import (
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"net"
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"net/http"
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pp "net/http/pprof"
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"runtime"
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"github.com/coredns/coredns/plugin/pkg/reuseport"
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)
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type handler struct {
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addr string
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rateBloc int
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ln net.Listener
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mux *http.ServeMux
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}
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func (h *handler) Startup() error {
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// Reloading the plugin without changing the listening address results
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// in an error unless we reuse the port because Startup is called for
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// new handlers before Shutdown is called for the old ones.
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ln, err := reuseport.Listen("tcp", h.addr)
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if err != nil {
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log.Errorf("Failed to start pprof handler: %s", err)
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return err
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}
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h.ln = ln
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h.mux = http.NewServeMux()
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h.mux.HandleFunc(path+"/", pp.Index)
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h.mux.HandleFunc(path+"/cmdline", pp.Cmdline)
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h.mux.HandleFunc(path+"/profile", pp.Profile)
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h.mux.HandleFunc(path+"/symbol", pp.Symbol)
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h.mux.HandleFunc(path+"/trace", pp.Trace)
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runtime.SetBlockProfileRate(h.rateBloc)
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go func() {
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http.Serve(h.ln, h.mux)
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}()
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return nil
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}
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func (h *handler) Shutdown() error {
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if h.ln != nil {
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return h.ln.Close()
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}
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return nil
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}
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const (
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path = "/debug/pprof"
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)
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