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app.go
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app.go
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// Copyright (c) nano Author. 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 (
"fmt"
"net"
"net/http"
"os"
"os/signal"
"syscall"
"github.com/gorilla/websocket"
"strings"
"time"
"sync/atomic"
)
var running int32
func listen(addr string, isWs bool, opts ...Option) {
// mark application running
if atomic.AddInt32(&running, 1) != 1 {
logger.Println("Nano has running")
return
}
for _, opt := range opts {
opt(handler.options)
}
// cache heartbeat data
hbdEncode()
// initial all components
startupComponents()
// create global ticker instance, timer precision could be customized
// by SetTimerPrecision
globalTicker = time.NewTicker(timerPrecision)
// startup logic dispatcher
go handler.dispatch()
go func() {
if isWs {
listenAndServeWS(addr)
} else {
listenAndServe(addr)
}
}()
logger.Println(fmt.Sprintf("starting application %s, listen at %s", app.name, addr))
sg := make(chan os.Signal)
signal.Notify(sg, syscall.SIGINT, syscall.SIGQUIT, syscall.SIGKILL, syscall.SIGTERM)
// stop server
select {
case <-env.die:
logger.Println("The app will shutdown in a few seconds")
case s := <-sg:
logger.Println("got signal", s)
}
logger.Println("server is stopping...")
// shutdown all components registered by application, that
// call by reverse order against register
shutdownComponents()
atomic.StoreInt32(&running, 0)
}
// Enable current server accept connection
func listenAndServe(addr string) {
listener, err := net.Listen("tcp", addr)
if err != nil {
logger.Fatal(err.Error())
}
defer listener.Close()
for {
conn, err := listener.Accept()
if err != nil {
logger.Println(err.Error())
continue
}
go handler.handle(conn)
}
}
func listenAndServeWS(addr string) {
var upgrader = websocket.Upgrader{
ReadBufferSize: 1024,
WriteBufferSize: 1024,
CheckOrigin: env.checkOrigin,
}
http.HandleFunc("/"+strings.TrimPrefix(env.wsPath, "/"), func(w http.ResponseWriter, r *http.Request) {
conn, err := upgrader.Upgrade(w, r, nil)
if err != nil {
logger.Println(fmt.Sprintf("Upgrade failure, URI=%s, Error=%s", r.RequestURI, err.Error()))
return
}
handler.handleWS(conn)
})
if err := http.ListenAndServe(addr, nil); err != nil {
logger.Fatal(err.Error())
}
}