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interface.go
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interface.go
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// Copyright (c) nano Authors. All Rights Reserved.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
package nano
import (
"os"
"os/signal"
"path/filepath"
"strings"
"sync/atomic"
"syscall"
"time"
"github.com/aura-studio/nano/cluster"
"github.com/aura-studio/nano/codec/plaincodec"
"github.com/aura-studio/nano/component"
"github.com/aura-studio/nano/env"
"github.com/aura-studio/nano/log"
"github.com/aura-studio/nano/scheduler"
)
const (
Cluster = "cluster"
Singleton = "singleton"
Frontend = "frontend"
Backend = "backend"
)
var chReady = make(chan struct{}, 1)
var (
// app represents the current server process
app = &struct {
running int32
name string // current application name
startAt time.Time // startup time
mode string // cluster mode
typ string // frontend or backend
stopping int32
}{}
)
// Serve listens on the TCP network address addr
// and then calls Serve with handler to handle requests
// on incoming connections.
func Serve(opts ...Option) {
if atomic.AddInt32(&app.running, 1) != 1 {
log.Infoln("Nano server is running")
return
}
// application initialize
app.name = strings.TrimLeft(filepath.Base(os.Args[0]), "/")
app.startAt = time.Now()
// environment initialize
if wd, err := os.Getwd(); err != nil {
panic(err)
} else {
env.Wd, _ = filepath.Abs(wd)
}
opt := cluster.Options{
Components: &component.Components{},
}
for _, option := range opts {
option(&opt)
}
log.SetLogger(opt.Logger)
log.Infoln("Nano server is starting...")
// Use listen address as client address in non-cluster mode
if opt.IsMaster || opt.AdvertiseAddr != "" {
app.mode = Cluster
} else {
app.mode = Singleton
}
// Set the retry interval to 3 secondes if doesn't set by user
if opt.RetryInterval == 0 {
opt.RetryInterval = time.Second * 3
}
// Set default codec
if opt.Codec == nil {
opt.Codec = plaincodec.NewCodec()
}
node := &cluster.Node{
Options: opt,
}
err := node.Startup()
if err != nil {
log.Fatalf("Nano server startup failed: %v", err)
}
if node.TCPAddr != "" {
app.typ = Frontend
} else {
app.typ = Backend
}
log.Infof("Startup %v as %v server in %v mode", app.name, app.typ, app.mode)
if node.MemberAddr != "" {
log.Infof("Member address: %s", node.MemberAddr)
}
if node.TCPAddr != "" {
log.Infof("TCP address: %s", node.TCPAddr)
}
if node.HttpAddr != "" {
log.Infof("HTTP address: %s", node.HttpAddr)
}
if node.DebugAddr != "" {
log.Infof("Debug address: %s", node.DebugAddr)
}
log.Infof("Nano server is serving...")
go scheduler.Digest()
sg := make(chan os.Signal, 1)
signal.Notify(sg, syscall.SIGINT, syscall.SIGQUIT, syscall.SIGTERM)
chReady <- struct{}{}
select {
case <-env.Die:
log.Infoln("The app will shutdown in a few seconds")
case s := <-sg:
log.Infoln("Nano server got signal", s)
}
atomic.StoreInt32(&app.stopping, 1)
log.Infoln("Nano server is stopping...")
node.Shutdown()
scheduler.Close()
atomic.StoreInt32(&app.running, 0)
log.Infoln("Nano server stopped")
}
// Shutdown send a signal to let 'nano' shutdown itself.
func Shutdown() {
close(env.Die)
}
func Ready() <-chan struct{} {
return chReady
}
func Stopping() bool {
return atomic.LoadInt32(&app.stopping) > 0
}