apns is an apple apns libary for http2

feature:

• support connection pool

• support ping frame using check connection alive

============

install

	go get golang.org/x/net/http2

	go get github.com/blackbeans/apns

quick start

create apns client

   
   certificate, _ := FromP12File("./push.p12", "xxxx")

   pool, err := NewConnPool(10, 10, 10, 20*time.Second,
   	func(ctx context.Context) (*ApnsConn, error) {
   		conn, err := NewApnsConn(ctx, certificate, URL_PRODUCTION, 10*time.Second)
   		if nil != err {
   			log.Printf("Create Apns Conn Fail %v\n",err)
   		}
   		return conn, err
   })

   //build notification 

   notify := &Notification{
   		DeviceToken: "your device token",
   		Topic:       "bundleid ",
   		ApnsID:      "uuid",
   		Payload: PayLoad{
   			Aps: Aps{Alert: fmt.Sprintf("hello%d", i)}}}
   
   //send push

   c,err:= pool.Get()
   if nil!=err{
   	//
   }

   //note : release connection
   defer pool.Release(c)

   err =c.SendMessage(notify)
   
   if nil!=err{
   	//encounter error
   }else{
   	if notify.Response.Status != 200{
   		//may send error
   		log.Printf("Response Err %s",notify.Response.Reason)

   		//maybe u need resent
   	}
   }