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websocketconnection.go
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/
websocketconnection.go
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package main
import (
"encoding/json"
"fmt"
"net/http"
"sync"
"github.com/HackerLoop/rotonde/shared"
log "github.com/Sirupsen/logrus"
"github.com/gorilla/websocket"
"github.com/mitchellh/mapstructure"
)
// Start the websocket server, each peer connecting to this websocket will be added as a connection to the dispatcher
func Start(d *Dispatcher, port int) {
var upgrader = websocket.Upgrader{
ReadBufferSize: 2048,
WriteBufferSize: 2048,
CheckOrigin: func(r *http.Request) bool {
return true
},
}
http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
log.Debug("Connection received")
conn, err := upgrader.Upgrade(w, r, nil)
if err != nil {
log.Fatal(err)
}
defer conn.Close()
startConnection(conn, d)
})
go http.ListenAndServe(fmt.Sprintf(":%d", port), nil)
log.Println(fmt.Sprintf("Websocket server started on port %d", port))
select {}
}
func startConnection(conn *websocket.Conn, d *Dispatcher) {
c := NewConnection()
d.AddConnection(c)
defer c.Close()
errChan := make(chan error)
var wg sync.WaitGroup
wg.Add(1)
go func() {
defer wg.Done()
var jsonPacket []byte
var err error
var packet rotonde.Packet
for {
select {
case dispatcherPacket := <-c.InChan:
switch data := dispatcherPacket.(type) {
case rotonde.Event:
packet = rotonde.Packet{Type: "event", Payload: data}
case rotonde.Action:
packet = rotonde.Packet{Type: "action", Payload: data}
case rotonde.Definition:
packet = rotonde.Packet{Type: "def", Payload: data}
case rotonde.UnDefinition:
packet = rotonde.Packet{Type: "undef", Payload: data}
default:
log.Info("Oops unknown packet: ", dispatcherPacket)
}
jsonPacket, err = json.Marshal(packet)
if err != nil {
log.Warning(err)
}
if err := conn.WriteMessage(websocket.TextMessage, jsonPacket); err != nil {
log.Warning(err)
return
}
case <-errChan:
return
}
}
}()
wg.Add(1)
go func() {
defer wg.Done()
var dispatcherPacket interface{}
for {
messageType, reader, err := conn.NextReader()
if err != nil {
log.Println(err)
errChan <- err
return
}
if messageType == websocket.TextMessage {
packet := rotonde.Packet{}
decoder := json.NewDecoder(reader)
if err := decoder.Decode(&packet); err != nil {
log.Warning(err)
continue
}
switch packet.Type {
case "event":
event := rotonde.Event{}
mapstructure.Decode(packet.Payload, &event)
dispatcherPacket = event
case "action":
action := rotonde.Action{}
mapstructure.Decode(packet.Payload, &action)
dispatcherPacket = action
case "sub":
subscription := rotonde.Subscription{}
mapstructure.Decode(packet.Payload, &subscription)
dispatcherPacket = subscription
case "unsub":
unsubscription := rotonde.Unsubscription{}
mapstructure.Decode(packet.Payload, &unsubscription)
dispatcherPacket = unsubscription
case "def":
definition := rotonde.Definition{}
mapstructure.Decode(packet.Payload, &definition)
dispatcherPacket = definition
case "undef":
unDefinition := rotonde.UnDefinition{}
mapstructure.Decode(packet.Payload, &unDefinition)
dispatcherPacket = unDefinition
}
c.OutChan <- dispatcherPacket
}
}
}()
log.Println("Treating messages")
wg.Wait()
}