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ratel.go
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ratel.go
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package ratel
import (
"context"
"fmt"
"os"
"os/signal"
"runtime/debug"
"sync"
"syscall"
"time"
"github.com/abulo/ratel/cycle"
"github.com/abulo/ratel/goroutine"
"github.com/abulo/ratel/logger"
"github.com/abulo/ratel/registry"
"github.com/abulo/ratel/server"
"github.com/abulo/ratel/stack"
"github.com/abulo/ratel/trace"
"github.com/abulo/ratel/worker"
"golang.org/x/sync/errgroup"
)
const (
//StageAfterStop after app stop
StageAfterStop uint32 = iota + 1
//StageBeforeStop before app stop
StageBeforeStop
)
// Ratel Create an instance of Application, by using &Ratel{}
type Ratel struct {
cycle *cycle.Cycle
smu *sync.RWMutex
initOnce sync.Once
startupOnce sync.Once
stopOnce sync.Once
servers []server.Server
workers []worker.Worker
registerer registry.Registry
hooks map[uint32]*stack.DeferStack
stopped chan struct{}
sig chan os.Signal
}
var App *Ratel
//New new a Application
func New(fns ...func() error) (*Ratel, error) {
App = &Ratel{}
if err := App.Startup(fns...); err != nil {
return nil, err
}
return App, nil
}
//Startup ..
func (app *Ratel) Startup(fns ...func() error) error {
app.initialize()
if err := app.startup(); err != nil {
return err
}
return goroutine.SerialUntilError(fns...)()
}
// initialize application
func (app *Ratel) initialize() {
app.initOnce.Do(func() {
//assign
app.cycle = cycle.NewCycle()
app.smu = &sync.RWMutex{}
app.servers = make([]server.Server, 0)
app.workers = make([]worker.Worker, 0)
app.stopped = make(chan struct{})
//private method
app.initHooks(StageBeforeStop, StageAfterStop)
app.Registry(registry.Nop{})
})
}
//init hooks
func (app *Ratel) initHooks(hookKeys ...uint32) {
app.hooks = make(map[uint32]*stack.DeferStack, len(hookKeys))
for _, k := range hookKeys {
app.hooks[k] = stack.NewStack()
}
}
//run hooks
func (app *Ratel) runHooks(k uint32) {
hooks, ok := app.hooks[k]
if ok {
hooks.Clean()
}
}
//RegisterHooks register a stage Hook
func (app *Ratel) RegisterHooks(k uint32, fns ...func() error) error {
hooks, ok := app.hooks[k]
if ok {
hooks.Push(fns...)
return nil
}
return fmt.Errorf("hook stage not found")
}
// start up application
// By default the startup composition is:
// - parse config, watch, version flags
// - load config
// - init default biz logger, jupiter frame logger
// - init procs
func (app *Ratel) startup() (err error) {
app.startupOnce.Do(func() {
err = goroutine.SerialUntilError()()
})
return
}
// Serve start server
func (app *Ratel) Serve(s ...server.Server) error {
app.smu.Lock()
defer app.smu.Unlock()
app.servers = append(app.servers, s...)
return nil
}
// Registry set customize registry
func (app *Ratel) Registry(reg registry.Registry) *Ratel {
app.registerer = reg
return app
}
// Worker ..
func (app *Ratel) Worker(w worker.Worker) *Ratel {
app.workers = append(app.workers, w)
return app
}
//Tracer ...
func (app *Ratel) Tracer(name, host string) *Ratel {
cfg := trace.InitConfig(host)
cfg.ServiceName = name
if err := trace.New(cfg).Setup(); err != nil {
logger.Logger.Panic(err)
}
return app
}
// Run run application
func (app *Ratel) Run(servers ...server.Server) error {
app.smu.Lock()
app.servers = append(app.servers, servers...)
app.smu.Unlock()
app.waitSignals() //start signal listen task in goroutine
// start servers and govern server
app.cycle.Run(app.startServers)
// start workers
app.cycle.Run(app.startWorkers)
//blocking and wait quit
if err := <-app.cycle.Wait(); err != nil {
logger.Logger.Error("shutdown with error", err)
return err
}
logger.Logger.Info("shutdown, bye!")
return nil
}
// waitSignals wait signal
// waitSignals wait signal
func (app *Ratel) waitSignals() {
logger.Logger.Info("init listen signal, pid:", syscall.Getpid())
signals := []os.Signal{syscall.SIGHUP, syscall.SIGINT, syscall.SIGTERM, syscall.SIGTSTP, syscall.SIGUSR1, syscall.SIGQUIT, os.Interrupt}
app.sig = make(chan os.Signal)
signal.Notify(app.sig, signals...)
go app.exitHandler()
}
func (app *Ratel) exitHandler() {
debug.FreeOSMemory()
sig := <-app.sig
logger.Logger.Info(fmt.Sprintf("Received SIG. [PID:%d, SIG:%v]", syscall.Getpid(), sig))
switch sig {
case syscall.SIGHUP:
if err := app.Run(); err != nil {
logger.Logger.Error(fmt.Sprintf("Received SIG. [PID:%d, SIG:%v]", syscall.Getpid(), sig))
}
app.GracefulStop(context.Background())
case syscall.SIGINT, syscall.SIGTERM, syscall.SIGTSTP, syscall.SIGUSR1, syscall.SIGQUIT, os.Interrupt:
logger.Logger.Info("close server")
os.Exit(128 + int(sig.(syscall.Signal)))
}
}
// GracefulStop application after necessary cleanup
func (app *Ratel) GracefulStop(ctx context.Context) (err error) {
app.stopOnce.Do(func() {
app.stopped <- struct{}{}
app.runHooks(StageBeforeStop)
if app.registerer != nil {
err = app.registerer.Close()
if err != nil {
logger.Logger.Error("stop register close err", err)
}
}
//stop servers
app.smu.RLock()
for _, s := range app.servers {
func(s server.Server) {
app.cycle.Run(func() error {
return s.GracefulStop(ctx)
})
}(s)
}
app.smu.RUnlock()
//stop workers
for _, w := range app.workers {
func(w worker.Worker) {
app.cycle.Run(w.WorkerStop)
}(w)
}
<-app.cycle.Done()
app.runHooks(StageAfterStop)
app.cycle.Close()
})
return nil
}
// Stop application immediately after necessary cleanup
func (app *Ratel) Stop() (err error) {
app.stopOnce.Do(func() {
app.stopped <- struct{}{}
app.runHooks(StageBeforeStop)
if app.registerer != nil {
err = app.registerer.Close()
if err != nil {
logger.Logger.Error("stop register close err", err)
}
}
//stop servers
app.smu.RLock()
for _, s := range app.servers {
func(s server.Server) {
app.cycle.Run(s.Stop)
}(s)
}
app.smu.RUnlock()
//stop workers
for _, w := range app.workers {
func(w worker.Worker) {
app.cycle.Run(w.WorkerStop)
}(w)
}
<-app.cycle.Done()
app.runHooks(StageAfterStop)
app.cycle.Close()
})
return nil
}
func (app *Ratel) startServers() error {
var eg errgroup.Group
var ctx, cancel = context.WithTimeout(context.Background(), time.Second*10)
go func() {
<-app.stopped
cancel()
}()
// start multi servers
for _, s := range app.servers {
s := s
eg.Go(func() (err error) {
_ = app.registerer.RegisterService(ctx, s.Info())
defer app.registerer.UnregisterService(ctx, s.Info())
logger.Logger.Info("start server:", s.Info().Name, ":", s.Info().Label(), ":", s.Info().Scheme)
err = s.Serve()
return
})
}
return eg.Wait()
}
func (app *Ratel) startWorkers() error {
var eg errgroup.Group
// start multi workers
for _, w := range app.workers {
w := w
eg.Go(func() error {
return w.WorkerStart()
})
}
return eg.Wait()
}