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package endpoints
import (
"fmt"
"net"
"net/http"
_ "net/http/pprof" // pprof magic
"time"
"github.com/lxc/incus/v6/internal/ports"
internalUtil "github.com/lxc/incus/v6/internal/util"
"github.com/lxc/incus/v6/shared/logger"
)
func pprofCreateServer() *http.Server {
// Undo the magic that importing pprof does
pprofMux := http.DefaultServeMux
http.DefaultServeMux = http.NewServeMux()
// Setup an http server
srv := &http.Server{
Handler: pprofMux,
}
return srv
}
func pprofCreateListener(address string) (net.Listener, error) {
return net.Listen("tcp", address)
}
// PprofAddress returns the network address of the pprof endpoint, or an empty string if there's no pprof endpoint.
func (e *Endpoints) PprofAddress() string {
e.mu.RLock()
defer e.mu.RUnlock()
listener := e.listeners[pprof]
if listener == nil {
return ""
}
return listener.Addr().String()
}
// PprofUpdateAddress updates the address for the pprof endpoint, shutting it down and restarting it.
func (e *Endpoints) PprofUpdateAddress(address string) error {
if address != "" {
address = internalUtil.CanonicalNetworkAddress(address, ports.HTTPDebugDefaultPort)
}
oldAddress := e.NetworkAddress()
if address == oldAddress {
return nil
}
logger.Infof("Update pprof address")
e.mu.Lock()
defer e.mu.Unlock()
// Close the previous socket
_ = e.closeListener(pprof)
// If turning off listening, we're done
if address == "" {
return nil
}
// Attempt to setup the new listening socket
getListener := func(address string) (*net.Listener, error) {
var err error
var listener net.Listener
for range 10 { // Ten retries over a second seems reasonable.
listener, err = net.Listen("tcp", address)
if err == nil {
break
}
time.Sleep(100 * time.Millisecond)
}
if err != nil {
return nil, fmt.Errorf("Cannot listen on http socket: %w", err)
}
return &listener, nil
}
// If setting a new address, setup the listener
if address != "" {
listener, err := getListener(address)
if err != nil {
// Attempt to revert to the previous address
listener, err1 := getListener(oldAddress)
if err1 == nil {
e.listeners[pprof] = *listener
e.serve(pprof)
}
return err
}
e.listeners[pprof] = *listener
e.serve(pprof)
}
return nil
}
|
