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 + "?")
}
//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()
}
// 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)
}
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()
}
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 + "?")
}
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()
}
