/
app.go
184 lines (143 loc) · 3.68 KB
/
app.go
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package main
import (
"log"
"github.com/gorilla/websocket"
"time"
"sync/atomic"
)
var msgcnt int32 = 0
type App struct {
Name string
Url string
UseChannel bool
AllowEmptyPOSTData bool
ConnectionSvcURL string
RunningInstancePath string
IsRunning bool
RemotesHub *Hub
ReceiversHub *Hub
Channel chan *AppMessage
LastActive time.Time
}
type AppMessage struct {
Data []byte
Mtype int
Id int
To *Hub
}
func (app *App) StartChannel(){
appname := app.Name
log.Printf("%s: Starting event channel", appname)
defer log.Printf("%s: Event channel is closed.", appname)
for {
select {
case msg, ok := <- app.Channel:
if !ok {
return
}
hub := msg.To
from := hub.FromLabel
to := hub.ToLabel
for app.IsRunning && ( len(app.ReceiversHub.Members) == 0 || len(app.RemotesHub.Members) == 0 ){
log.Printf("%s: Waiting for members to join.", appname)
time.Sleep(2000*time.Millisecond)
}
app.KeepAlive()
for ws := range hub.Members {
log.Printf("%s: SEND [%d] %s -> %s (of %d) [%s]", appname, msg.Id, from, to, len(hub.Members), string(msg.Data))
err := ws.WriteMessage(msg.Mtype, msg.Data)
if err != nil{
log.Printf("%s: Error pumping message to %s: %s", app, to, err)
}
}
}
}
}
func (app *App) KeepAlive(){
app.LastActive = time.Now()
}
func (app *App) StopChannel(){
if app.Channel == nil {
return
}
close(app.Channel)
app.ReceiversHub.Close()
app.RemotesHub.Close()
}
func (app *App) RequestStop(){
}
func (app *App) RequestInfo(){
//for now just a liveness signal
app.KeepAlive()
}
func (app *App) Start(){
app.KeepAlive()
if app.IsRunning {
return
}
log.Printf("%s: Starting.", app.Name)
app.IsRunning = true
app.Channel = make(chan *AppMessage, 1000)
app.RemotesHub = &Hub{ FromLabel: "receiver", ToLabel: "remote", Members: map[*websocket.Conn]bool{} }
app.ReceiversHub = &Hub{ FromLabel: "remote", ToLabel: "receiver", Members: map[*websocket.Conn]bool{}}
go app.StartChannel()
}
func (app *App) Stop(){
if app.IsRunning == false {
return
}
log.Printf("%s: Closing.", app.Name)
app.IsRunning = false
app.StopChannel()
}
func (app *App) removeSocket(ws *websocket.Conn, socketmap map[*websocket.Conn]bool){
delete(socketmap, ws)
ws.Close()
}
func (app *App) registerSocket(ws *websocket.Conn, hub *Hub, toHub *Hub){
defer hub.RemoveMember(ws)
hub.AddMember(ws)
app.KeepAlive()
from := toHub.FromLabel
to := toHub.ToLabel
appname := app.Name
for {
mtype, p, err := ws.ReadMessage()
if err !=nil {
log.Printf("%s: Connection (%s): %s", app.Name, from, err)
break
}
msg := &AppMessage{ Data: p,
Mtype: mtype,
Id: int(atomic.AddInt32(&msgcnt, 1)),
To: toHub }
log.Printf("%s: QUEUE [%d] %s -> %s (of %d) [%s]", appname, msg.Id, from, to, len(hub.Members), string(msg.Data))
app.Channel <- msg
}
}
func (app *App) RegisterRemote(ws *websocket.Conn){
// remotes -> rec
app.registerSocket(ws, app.RemotesHub, app.ReceiversHub)
}
func (app *App) RegisterReceiver(ws *websocket.Conn){
// rec -> remotes
app.registerSocket(ws, app.ReceiversHub, app.RemotesHub)
}
type Hub struct {
Members map[*websocket.Conn]bool
FromLabel string
ToLabel string
App *App
}
func (hub *Hub) Close(){
for ws := range hub.Members {
hub.RemoveMember(ws)
}
}
func (hub *Hub) RemoveMember(ws *websocket.Conn){
delete(hub.Members, ws)
ws.Close()
}
func (hub *Hub) AddMember(ws *websocket.Conn){
hub.Members[ws] = true
}