163 lines
2.8 KiB
Go
163 lines
2.8 KiB
Go
package websocket
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import (
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"fmt"
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"net"
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"git.xdrm.io/go/ws/internal/uri"
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)
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// All channels that a server features
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type serverChannelSet struct {
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register chan *client
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unregister chan *client
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broadcast chan Message
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}
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// Server is a websocket server
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type Server struct {
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sock net.Listener // listen socket
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addr []byte // server listening ip/host
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port uint16 // server listening port
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clients map[net.Conn]*client
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ctl ControllerSet // controllers
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ch serverChannelSet
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}
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// CreateServer for a specific HOST and PORT
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func CreateServer(host string, port uint16) *Server {
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return &Server{
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addr: []byte(host),
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port: port,
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clients: make(map[net.Conn]*client, 0),
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ctl: ControllerSet{
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Def: nil,
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URI: make([]*Controller, 0),
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},
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ch: serverChannelSet{
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register: make(chan *client, 1),
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unregister: make(chan *client, 1),
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broadcast: make(chan Message, 1),
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},
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}
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}
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// BindDefault binds a default controller
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// it will be called if the URI does not
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// match another controller
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func (s *Server) BindDefault(f ControllerFunc) {
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s.ctl.Def = &Controller{
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URI: nil,
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Fun: f,
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}
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}
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// Bind a controller to an URI scheme
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func (s *Server) Bind(uriStr string, f ControllerFunc) error {
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// 1. Build URI parser
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uriScheme, err := uri.FromString(uriStr)
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if err != nil {
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return fmt.Errorf("cannot build URI: %w", err)
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}
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// 2. Create controller
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s.ctl.URI = append(s.ctl.URI, &Controller{
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URI: uriScheme,
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Fun: f,
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})
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return nil
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}
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// Launch the websocket server
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func (s *Server) Launch() error {
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var err error
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/* (1) Listen socket
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---------------------------------------------------------*/
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// 1. Build full url
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url := fmt.Sprintf("%s:%d", s.addr, s.port)
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// 2. Bind socket to listen
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s.sock, err = net.Listen("tcp", url)
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if err != nil {
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return fmt.Errorf("listen: %w", err)
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}
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defer s.sock.Close()
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fmt.Printf("+ listening on %s\n", url)
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// 3. Launch scheduler
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go s.scheduler()
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/* (2) For each incoming connection (client)
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---------------------------------------------------------*/
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for {
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// 1. Wait for client
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sock, err := s.sock.Accept()
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if err != nil {
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break
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}
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go func() {
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// 2. Try to create client
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cli, err := buildClient(sock, s.ctl, s.ch)
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if err != nil {
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fmt.Printf(" - %s\n", err)
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return
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}
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// 3. Register client
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s.ch.register <- cli
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}()
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}
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return nil
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}
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// Scheduler schedules clients registration and broadcast
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func (s *Server) scheduler() {
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for {
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select {
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// 1. Create client
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case client := <-s.ch.register:
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s.clients[client.io.sock] = client
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// 2. Remove client
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case client := <-s.ch.unregister:
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delete(s.clients, client.io.sock)
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// 3. Broadcast
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case msg := <-s.ch.broadcast:
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for _, c := range s.clients {
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c.ch.send <- msg
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}
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}
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}
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}
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