Notes/connection_manager.go

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2023-06-15 07:24:23 +02:00
package main
import (
// External
"github.com/google/uuid"
"github.com/gorilla/websocket"
// Standard
"log"
"net/http"
)
type WsConnection struct {
ConnectionManager *ConnectionManager
UUID string
Conn *websocket.Conn
Pruned bool
}
type ConnectionManager struct {
connections map[string]*WsConnection
broadcastQueue chan interface{}
sendQueue chan SendRequest
}
type SendRequest struct {
WsConn *WsConnection
Msg interface{}
}
func validateOrigin(r *http.Request) bool {// {{{
/*
host := r.Header.Get("X-Forwarded-Host")
if host == "" {
components := strings.Split(r.Host, ":")
host = components[0]
}
*/
return true
}// }}}
var (
upgrader = websocket.Upgrader{
ReadBufferSize: 1024,
WriteBufferSize: 1024,
// CheckOrigin is to match DOMAIN constant.
// Use X-Forwarded-Server if behind proxy.
CheckOrigin: validateOrigin,
}
)
func NewConnectionManager() (cm ConnectionManager) {// {{{
cm.connections = make(map[string]*WsConnection)
cm.sendQueue = make(chan SendRequest, 65536)
cm.broadcastQueue = make(chan interface{}, 65536)
return
}// }}}
// NewConnection creates a new connection, which is assigned a UUIDv4 for
// identification. This is then put into the connection collection.
func (cm *ConnectionManager) NewConnection(w http.ResponseWriter, r *http.Request) (*WsConnection, error) {// {{{
var err error
wsConn := WsConnection{
UUID: uuid.NewString(),
ConnectionManager: cm,
}
wsConn.Conn, err = upgrader.Upgrade(w, r, nil)
if err != nil {
return nil, err
}
// Keep track of all connections.
cm.connections[wsConn.UUID] = &wsConn
// Successfully upgraded to a websocket connection.
log.Printf("[%s] Connection from %s", wsConn.UUID, r.RemoteAddr)
go cm.ReadLoop(&wsConn)
return &wsConn, nil
}// }}}
// Prune closes an deletes connections. If this happened to be non-fatal, the
// user will just have to reconnect.
func (cm *ConnectionManager) Prune(wsConn *WsConnection, err error) {// {{{
if false {
log.Printf("[%s] pruning connection [%s]\n", wsConn.UUID, err)
}
wsConn.Conn.Close()
wsConn.Pruned = true
delete(cm.connections, wsConn.UUID)
}// }}}
func (cm *ConnectionManager) ReadLoop(wsConn *WsConnection) {// {{{
var data []byte
var ok bool
for {
if data, ok = cm.Read(wsConn); !ok {
break
}
log.Printf("%s\n", data)
//cm.Send(wsConn, response)
}
}// }}}
func (cm *ConnectionManager) Read(wsConn *WsConnection) ([]byte, bool) {// {{{
var err error
var requestData []byte
_, requestData, err = wsConn.Conn.ReadMessage()
if err != nil {
cm.Prune(wsConn, err)
return nil, false
}
return requestData, true
}// }}}
func (cm *ConnectionManager) Send(wsConn *WsConnection, msg interface{}) {// {{{
wsConn.Conn.WriteJSON(msg)
}// }}}
func (cm *ConnectionManager) Broadcast(msg interface{}) {// {{{
cm.broadcastQueue <- msg
}// }}}
func (cm *ConnectionManager) BroadcastLoop() {// {{{
for {
msg := <-cm.broadcastQueue
for _, wsConn := range cm.connections {
cm.Send(wsConn, msg)
}
}
}// }}}
// vim: foldmethod=marker