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signals.go
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signals.go
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//go:build !windows
// +build !windows
/*
* Copyright (c) 2019-2021. Abstrium SAS <team (at) pydio.com>
* This file is part of Pydio Cells.
*
* Pydio Cells is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Pydio Cells is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with Pydio Cells. If not, see <http://www.gnu.org/licenses/>.
*
* The latest code can be found at <https://pydio.com>.
*/
package cmd
import (
"fmt"
"io"
"os"
"os/signal"
"path/filepath"
"runtime/pprof"
"strings"
"syscall"
"time"
"go.uber.org/zap"
"github.com/pydio/cells/v4/common/log"
"github.com/pydio/cells/v4/common/runtime"
)
var (
profiling bool
profile io.WriteCloser
)
func handleSignals(args []string) {
c := make(chan os.Signal, 1)
// SIGUSR1 does not compile on windows. Use direct value syscall.Signal instead
// signal.Notify(c, syscall.SIGINT, syscall.SIGHUP, syscall.SIGUSR1, syscall.SIGTERM, syscall.SIGSTOP)
signal.Ignore()
signal.Notify(c)
go func() {
for sig := range c {
switch sig {
case syscall.SIGTERM:
fallthrough
case syscall.SIGKILL:
fallthrough
case syscall.SIGINT:
// Stopping the main context will trigger the stop of all services
log.Info("Cancelling main context")
cancel()
case syscall.SIGUSR1, syscall.SIGUSR2:
if !profiling {
startTags := "main-process"
if len(args) > 0 {
startTags = strings.Join(args, "-")
}
targetDir := filepath.Join(runtime.ApplicationWorkingDir(runtime.ApplicationDirLogs), "profiles", startTags)
os.MkdirAll(targetDir, 0755)
tStamp := time.Now().Format("2006-01-02T15:04:05")
if sig == syscall.SIGUSR1 { // SIGUSR2 will NOT write to Stdout
fmt.Printf("[Received SIGUSR1] Starting profiling session for process %d\n", os.Getpid())
pprof.Lookup("goroutine").WriteTo(os.Stdout, 1)
}
if routinesFile, err := os.OpenFile(filepath.Join(targetDir, tStamp+"-goroutines"), os.O_WRONLY|os.O_CREATE, 0755); err == nil {
pprof.Lookup("goroutine").WriteTo(routinesFile, 1)
routinesFile.Close()
}
if fheap, err := os.OpenFile(filepath.Join(targetDir, tStamp+"-heap-profile"), os.O_WRONLY|os.O_CREATE, 0755); err == nil {
pprof.WriteHeapProfile(fheap)
fheap.Close()
}
if fcpu, err := os.OpenFile(filepath.Join(targetDir, tStamp+"-cpu-profile"), os.O_WRONLY|os.O_CREATE, 0755); err == nil {
pprof.StartCPUProfile(fcpu)
profile = fcpu
profiling = true
}
// Close profiling session after 30s if user forgot to send a second call
go func(print bool) {
<-time.After(20 * time.Second)
if profiling {
if print {
fmt.Printf("Profiling session dumped to %s for process %d\n", targetDir, os.Getpid())
}
pprof.StopCPUProfile()
if err := profile.Close(); err != nil {
log.Fatal("Cannot close cpu profile", zap.Error(err))
}
profiling = false
}
}(sig == syscall.SIGUSR1)
} else {
pprof.StopCPUProfile()
if err := profile.Close(); err != nil {
log.Fatal("Cannot close cpu profile", zap.Error(err))
}
profiling = false
}
case syscall.SIGHUP:
// Stop all services
//for _, service := range allServices {
// if service.RequiresFork() && !IsFork {
// // Stopping here would kill the command and prevent proper de-registering of service
// // Signal will be passed along and the fork will stop by itself.
// continue
// }
//
// service.Stop()
//
// service.Start(ctx)
//}
}
}
}()
}