Exemple #1
0
func (g *RpcHandler) handleRpcRequest(cmd string, seq int, args []interface{}) (reply []interface{}) {
	glog.Infoln("rpc", cmd, args)
	if cmd == "echo" {
		return []interface{}{seq, "", args}
	}

	defer func() {
		errMsg := ""
		switch v := recover().(type) {
		case nil:
			// no error
		case string:
			errMsg = v
		case error:
			errMsg = v.Error()
		default:
			errMsg = fmt.Sprintf("%T: %v", v, v)
		}
		if errMsg != "" {
			glog.Warningln("rpc-error", cmd, args, errMsg)
			reply = []interface{}{seq, errMsg}
		}
	}()

	// FIXME: hack alert, this is special-cased to deal with the database
	switch cmd {
	case "db-get":
		result := database.Get(args[0].(string))
		return []interface{}{seq, "", result}
	case "db-keys":
		result := database.Keys(args[0].(string))
		return []interface{}{seq, "", result}
	case "db-put":
		var value interface{}
		if len(args) > 1 {
			value = args[1]
		}
		database.Put(args[0].(string), value)
		return nil
	}

	// if there's registered circuit for cmd, set it up and return as a stream
	if _, ok := flow.Registry[cmd]; ok && len(args) == 1 {
		c := flow.NewCircuit()
		c.Add("x", cmd)
		c.AddCircuitry("y", &streamRpcResults{seqNum: seq, replies: g})
		c.Connect("x.Out", "y.In", 0)
		for k, v := range args[0].(map[string]interface{}) {
			c.Feed("x."+k, tryToConvertToTag(v))
		}
		go func() {
			defer flow.DontPanic()
			c.Run()
			g.Out.Send([]interface{}{seq, false}) // end streaming
		}()
		return []interface{}{seq, true} // start streaming
	}

	panic(cmd + "?")
}
Exemple #2
0
//wsHandler now used ws.Config as protocol handshake now supported
func wsHandler(ws *websocket.Conn) {
	defer flow.DontPanic()
	defer ws.Close()

	hdr := ws.Request().Header

	// keep track of connected clients for reload broadcasting
	id := hdr.Get("Sec-Websocket-Key")
	wsClients[id] = ws
	defer delete(wsClients, id)

	// the protocol name is used as tag to locate the proper circuit
	//lightbulb: We use the protocol provided by ws, rather than header, as that contains server accepted value
	tag := ws.Config().Protocol[0]

	fmt.Println("WS Protocol Selected:", tag)

	if tag == "" { //no specific protocol, lets opt for 'default' which just echoes (or return with no circuit!)
		tag = "default"
	}

	g := flow.NewCircuit()
	g.AddCircuitry("head", &wsHead{ws: ws})
	g.Add("ws", "WebSocket-"+tag) //the client has negotiated this support
	g.AddCircuitry("tail", &wsTail{ws: ws})
	g.Connect("head.Out", "ws.In", 0)
	g.Connect("ws.Out", "tail.In", 0)
	g.Run()
}
Exemple #3
0
// Set up the handlers, then start the server and start processing requests.
func (w *HTTPServer) Run() {
	mux := http.NewServeMux() // don't use default to allow multiple instances

	port := getInputOrConfig(w.Port, "HTTP_PORT") //TODO:This is dependant upon mqtt func, needs moving - lightbulb

	pem := ""
	key := ""

	for param := range w.Param {

		switch param.(type) {

		case flow.Tag:
			switch param.(flow.Tag).Tag {
			case "certfile":
				f := param.(flow.Tag).Msg.(string)
				if _, err := os.Stat(f); err == nil {
					glog.Infoln("Using Certfile:", f)
					pem = f
				}
			case "certkey":
				f := param.(flow.Tag).Msg.(string)
				if _, err := os.Stat(f); err == nil {
					glog.Infoln("Using Keyfile:", f)
					key = f
				}
			}
		}
	}

	info, _ := NewHttpEndpointInfo(port, pem, key)

	for m := range w.Handlers {
		tag := m.(flow.Tag)
		switch v := tag.Msg.(type) {
		case string:
			h := createHandler(tag.Tag, v, info)
			mux.Handle(tag.Tag, &flowHandler{h, w})
		case http.Handler:
			mux.Handle(tag.Tag, &flowHandler{v, w})
		}
	}

	go func() {
		// will stay running until an error is returned or the app ends
		defer flow.DontPanic()
		var err error
		if info.uri.Scheme == "https" {
			err = http.ListenAndServeTLS(info.uri.Host, info.pem, info.key, mux)
		} else {
			err = http.ListenAndServe(info.uri.Host, mux)
		}
		glog.Fatal(err)
		glog.Infoln("http started on", info.uri.Host)
	}()
	// TODO: this is a hack to make sure the server is ready
	// better would be to interlock the goroutine with the listener being ready
	time.Sleep(50 * time.Millisecond)
}
Exemple #4
0
func main() {
	flag.Parse() // required, to set up the proper glog configuration
	flow.LoadConfig(defaults, *config)
	flow.DontPanic()

	// register more definitions from a JSON-formatted setup file, if specified
	if s := flow.Config["SETUP_FILE"]; s != "" {
		if err := flow.AddToRegistry(s); err != nil {
			panic(err)
		}
	}

	// if a registered circuit name is given on the command line, run it
	if flag.NArg() > 0 {
		if factory, ok := flow.Registry[flag.Arg(0)]; ok {
			factory().Run()
			return
		}
		fmt.Fprintln(os.Stderr, "Unknown command:", flag.Arg(0))
		os.Exit(1)
	}

	fmt.Printf("Starting webserver for http://%s/\n", flow.Config["HTTP_PORT"])

	// normal startup: save config info in database and start the webserver
	c := flow.NewCircuit()

	// database setup, save current config settings, register init gadget
	c.Add("db", "LevelDB")
	c.Feed("db.In", flow.Tag{"<clear>", "/config/"})
	c.Feed("db.In", flow.Tag{"/config/appName", "JeeBus"})
	c.Feed("db.In", flow.Tag{"/config/configFile", *config})
	for k, v := range flow.Config {
		c.Feed("db.In", flow.Tag{"/config/" + k, v})
	}
	c.Feed("db.In", flow.Tag{"<register>", "/gadget/init"})

	// wait for db to finish, then dispatch to the "init" gadget, if found
	c.Add("wait", "Waiter")
	c.Add("disp", "Dispatcher")
	c.Connect("db.Out", "wait.Gate", 0)
	c.Connect("wait.Out", "disp.In", 0)
	c.Feed("wait.In", flow.Tag{"<dispatch>", "init"})

	// webserver setup
	c.Add("http", "HTTPServer")
	c.Feed("http.Handlers", flow.Tag{"/", flow.Config["APP_DIR"]})
	c.Feed("http.Handlers", flow.Tag{"/base/", flow.Config["BASE_DIR"]})
	c.Feed("http.Handlers", flow.Tag{"/ws", "<websocket>"})

	// start the ball rolling, keep running forever
	c.Add("forever", "Forever")
	c.Run()
}
Exemple #5
0
func (g *RpcHandler) handleRpcRequest(cmd string, seq int, args []interface{}) (reply []interface{}) {
	if cmd == "echo" {
		return []interface{}{seq, "", args}
	}

	defer func() {
		errMsg := ""
		switch v := recover().(type) {
		case nil:
			// no error
		case string:
			errMsg = v
		case error:
			errMsg = v.Error()
		default:
			errMsg = fmt.Sprintf("%T: %v", v, v)
		}
		if errMsg != "" {
			glog.Warningln("rpc-error", cmd, args, errMsg)
			reply = []interface{}{seq, errMsg}
		}
	}()

	// if there's registered circuit for cmd, set it up and return as a stream
	fmt.Println("RPC:", cmd, args)
	if _, ok := flow.Registry[cmd]; ok && len(args) == 1 {
		c := flow.NewCircuit()
		c.Add("x", cmd)
		c.AddCircuitry("y", &streamRpcResults{seqNum: seq, replies: g})
		c.Connect("x.Out", "y.In", 0)
		for k, v := range args[0].(map[string]interface{}) {
			c.Feed("x."+k, tryToConvertToTag(v))
		}
		go func() {
			defer flow.DontPanic()
			c.Run()
			g.Out.Send([]interface{}{seq, false}) // end streaming
		}()
		return []interface{}{seq, true} // start streaming
	}

	panic(cmd + "?")
}
Exemple #6
0
func main() {
	flag.Parse() // required, to set up the proper glog configuration
	flow.LoadConfig(defaults, *config)

	// register more definitions from a JSON-formatted setup file, if specified
	if s := flow.Config["SETUP_FILE"]; s != "" {
		if err := flow.AddToRegistry(s); err != nil {
			panic(err)
		}
	}

	// if a registered circuit name is given on the command line, run it
	if flag.NArg() > 0 {
		if factory, ok := flow.Registry[flag.Arg(0)]; ok {
			factory().Run()
			return
		}
		fmt.Fprintln(os.Stderr, "Unknown command:", flag.Arg(0))
		os.Exit(1)
	}

	glog.Infof("Starting webserver for http://%s/\n", flow.Config["HTTP_PORT"])

	// show intro page via a static webserver if the main app dir is absent
	fd, err := os.Open(flow.Config["APP_DIR"])
	if err != nil {
		http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
			w.Write([]byte(introPage))
		})
		panic(http.ListenAndServe(flow.Config["HTTP_PORT"], nil))
	}
	fd.Close()

	// normal startup: save config info in database and start the webserver
	c := flow.NewCircuit()
	flow.DontPanic(c)

	// database setup, save current config settings, register init gadget
	c.Add("db", "LevelDB")
	c.Feed("db.In", flow.Tag{"<clear>", "/config/"})
	c.Feed("db.In", flow.Tag{"/config/appName", "HouseMon"})
	c.Feed("db.In", flow.Tag{"/config/version", VERSION})
	c.Feed("db.In", flow.Tag{"/config/buildDate", BUILD_DATE})
	c.Feed("db.In", flow.Tag{"/config/configFile", *config})
	for k, v := range flow.Config {
		c.Feed("db.In", flow.Tag{"/config/" + k, v})
	}
	c.Feed("db.In", flow.Tag{"<register>", "/gadget/init"})

	// wait for db to finish, then dispatch to the "init" gadget, if found
	c.Add("wait", "Waiter")
	c.Add("disp", "Dispatcher")
	c.Connect("db.Out", "wait.Gate", 0)
	c.Connect("wait.Out", "disp.In", 0)
	c.Feed("wait.In", flow.Tag{"<dispatch>", "init"})

	// webserver setup
	c.Add("http", "HTTPServer")
	c.Add("asink", "Sink")
	c.Connect("http.Out", "asink.In", 0)
	c.Feed("http.Handlers", flow.Tag{"DefaultMux", true})
	c.Feed("http.Handlers", flow.Tag{"/", flow.Config["APP_DIR"]})
	c.Feed("http.Handlers", flow.Tag{"/base/", flow.Config["BASE_DIR"]})
	c.Feed("http.Handlers", flow.Tag{"/ws", "<websocket>"})

	// start the ball rolling, keep running forever
	c.Add("forever", "Forever")
	c.Run()
}