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signal_debug.go
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/
signal_debug.go
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// +build !windows
package debug
import (
"context"
"os"
"os/signal"
"syscall"
"github.com/go-kit/kit/log"
"github.com/go-kit/kit/log/level"
)
const debugSignal = syscall.SIGUSR1
// AttachDebugHandler attaches a signal handler that toggles the debug server
// state when SIGUSR1 is sent to the process.
func AttachDebugHandler(addrPath string, logger log.Logger) {
sig := make(chan os.Signal, 1)
signal.Notify(sig, debugSignal)
go func() {
for {
// Start server on first signal
<-sig
serv, err := startDebugServer(addrPath, logger)
if err != nil {
level.Info(logger).Log(
"msg", "starting debug server",
"err", err,
)
continue
}
// Stop server on next signal
<-sig
if err := serv.Shutdown(context.Background()); err != nil {
level.Info(logger).Log(
"msg", "error shutting down debug server",
"err", err,
)
continue
}
level.Info(logger).Log(
"msg", "shutdown debug server",
)
}
}()
}