package websocket import ( "io" "golang.org/x/net/websocket" "github.com/FreifunkBremen/freifunkmanager/lib/log" ) const channelBufSize = 100 type Client struct { ip string ws *websocket.Conn ch chan *Message writeQuit chan bool readQuit chan bool } func NewClient(ip string, ws *websocket.Conn) *Client { if ws == nil { log.Log.Panic("ws cannot be nil") } return &Client{ ws: ws, ch: make(chan *Message, channelBufSize), writeQuit: make(chan bool), readQuit: make(chan bool), ip: ip, } } func (c *Client) Write(msg *Message) { select { case c.ch <- msg: default: clientsMutex.Lock() delete(clients, c.ip) clientsMutex.Unlock() log.HTTP(c.ws.Request()).Error("client disconnected") } } func (c *Client) Close() { c.writeQuit <- true c.readQuit <- true log.HTTP(c.ws.Request()).Info("client disconnecting...") } // Listen Write and Read request via chanel func (c *Client) Listen() { go c.listenWrite() c.Write(&Message{Type: MessageTypeStats, Body: stats}) c.allNodes() c.listenRead() } func (c *Client) allNodes() { for _, node := range nodes.List { c.Write(&Message{Type: MessageTypeCurrentNode, Node: node}) } for _, node := range nodes.ToUpdate { c.Write(&Message{Type: MessageTypeUpdateNode, Node: node}) } } func (c *Client) handleMessage(msg *Message) { switch msg.Type { case MessageTypeUpdateNode: nodes.UpdateNode(msg.Node) } } // Listen write request via chanel func (c *Client) listenWrite() { for { select { case msg := <-c.ch: websocket.JSON.Send(c.ws, msg) case <-c.writeQuit: close(c.ch) close(c.writeQuit) clientsMutex.Lock() delete(clients, c.ip) clientsMutex.Unlock() return } } } // Listen read request via chanel func (c *Client) listenRead() { for { select { case <-c.readQuit: close(c.readQuit) clientsMutex.Lock() delete(clients, c.ip) clientsMutex.Unlock() return default: var msg Message err := websocket.JSON.Receive(c.ws, &msg) if err == io.EOF { close(c.readQuit) c.writeQuit <- true return } else if err != nil { log.HTTP(c.ws.Request()).Error(err) } else { c.handleMessage(&msg) } } } }