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grace.go
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grace.go
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package grace
import (
"context"
"fmt"
"io/ioutil"
"os"
"os/signal"
"path/filepath"
"strconv"
"sync"
"syscall"
"time"
_ "go.uber.org/automaxprocs"
)
var (
defaultStopSignal = []os.Signal{
syscall.SIGINT,
syscall.SIGQUIT,
syscall.SIGTERM,
}
defaultLogger = func(format string, a ...interface{}) { fmt.Printf(format, a...) }
defaultPidDir *string = nil
)
// Signal declare stop signals
// Default is syscall.SIGINT, syscall.SIGQUIT or syscall.SIGTERM
func Signal(stopSignals ...os.Signal) {
if len(stopSignals) == 0 {
panic("GRACE PANIC nil stopSignals")
}
if isRunning {
panic("GRACE PANIC set stop signals after running.")
}
defaultStopSignal = stopSignals
}
// Log declare logger method
// Default is os.Stdout
func Log(logger func(format string, a ...interface{})) {
if isRunning {
panic("GRACE PANIC set log after running.")
}
defaultLogger = logger
}
// PID configure process file folder
// Default is unable
func PID(path string) {
if isRunning {
panic("GRACE PANIC set pid dir after running.")
}
defaultPidDir = &path
}
var (
sysGoroutines []Goroutine
isRunning bool
cancel func()
wg sync.WaitGroup
)
var (
CTX context.Context
)
// Goroutine function
type Goroutine func(ctx context.Context)
// Go start a goroutine
func Go(g Goroutine, opts ...Option) {
wrapG := g
for i := len(opts) - 1; i >= 0; i-- {
option := opts[i]
wrapG = option.wrap(wrapG)
}
if !isRunning {
sysGoroutines = append(sysGoroutines, wrapG)
return
}
wg.Add(1)
go func() {
defer wg.Done()
wrapG(CTX)
}()
}
//type Serve interface{
// ListenAndServe() error
// Shutdown(ctx context.Context)
//}
//
//// GoServe start a server
//func GoServe(s Serve, opts ...Option) {}
// Run start node
func Run(exitExpire time.Duration) {
if exitExpire <= 0 {
exitExpire = time.Minute
}
if isRunning {
panic("GRACE PANIC run twice.")
}
defaultLogger("%s GRACE is running...\n",
time.Now())
defaultLogger("%s GRACE stop signal %s \n",
time.Now(), defaultStopSignal)
isRunning = true
CTX, cancel = context.WithCancel(context.Background())
for _, g := range sysGoroutines {
wg.Add(1)
go func(goroutine Goroutine) {
defer wg.Done()
goroutine(CTX)
}(g)
}
signalChan := make(chan os.Signal, 1)
signal.Notify(signalChan, defaultStopSignal...)
allStopped := make(chan struct{})
go func() {
wg.Wait()
allStopped <- struct{}{}
close(allStopped)
}()
defer cancel()
if defaultPidDir != nil && len(*defaultPidDir) != 0 {
pidDir := *defaultPidDir
pid := os.Getpid()
pidFile := filepath.Join(pidDir, fmt.Sprintf("%d.pid", pid))
if !filepath.IsAbs(pidDir) {
dir, err := os.Getwd()
if err != nil {
panic(fmt.Errorf("GRACE pid os.Getwd %v", err))
}
pidFile = filepath.Join(dir, pidDir, fmt.Sprintf("%d.pid", pid))
}
os.MkdirAll(filepath.Dir(pidFile), 0777)
err := ioutil.WriteFile(pidFile, []byte(strconv.Itoa(pid)), 0777)
if err != nil {
panic(fmt.Errorf("GRACE pid monitor %s %v", pidFile, err))
}
defer func() {
err := os.Remove(pidFile)
if err != nil {
panic(fmt.Errorf("GRACE pid exit %s %v", pidFile, err))
}
}()
}
select {
case s := <-signalChan:
defaultLogger("%s GRACE receive stop signal %s \n",
time.Now(), s)
cancel()
defaultLogger("%s GRACE waitting all goroutines exit...\n",
time.Now())
select {
case <-time.After(exitExpire):
defaultLogger("%s GRACE stopped (expired).\n",
time.Now())
case <-allStopped:
defaultLogger("%s GRACE stopped (all goroutines exit).\n",
time.Now())
}
case <-allStopped:
defaultLogger("%s GRACE stopped (all goroutines exit).\n",
time.Now())
}
}