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class Cable.Connection
MAX_CONNECTION_INTERVAL: 5 * 1000
PING_STALE_INTERVAL: 8
constructor: (@cable) ->
@resetPingTime()
@resetConnectionAttemptsCount()
@connect()
send: (data) ->
if @isConnected()
@websocket.send(JSON.stringify(data))
true
else
false
connect: ->
@websocket = @createWebSocket()
createWebSocket: ->
ws = new WebSocket(@cable.url)
ws.onmessage = @onMessage
ws.onopen = @onConnect
ws.onclose = @onClose
ws.onerror = @onError
ws
onMessage: (message) =>
data = JSON.parse message.data
if data.identifier is '_ping'
@pingReceived(data.message)
else
@cable.subscribers.notify(data.identifier, "onMessage", data.message)
onConnect: =>
@startWaitingForPing()
@resetConnectionAttemptsCount()
@cable.subscribers.reload()
onClose: =>
@reconnect()
onError: =>
@reconnect()
isConnected: ->
@websocket?.readyState is 1
disconnect: ->
@removeExistingConnection()
@resetPingTime()
@cable.subscribers.notifyAll("onDisconnect")
reconnect: ->
@disconnect()
setTimeout =>
@incrementConnectionAttemptsCount()
@connect()
, @generateReconnectInterval()
removeExistingConnection: ->
if @websocket?
@clearPingWaitTimeout()
@websocket.onclose = -> # no-op
@websocket.onerror = -> # no-op
@websocket.close()
@websocket = null
resetConnectionAttemptsCount: ->
@connectionAttempts = 1
incrementConnectionAttemptsCount: ->
@connectionAttempts += 1
generateReconnectInterval: () ->
interval = (Math.pow(2, @connectionAttempts) - 1) * 1000
if interval > @MAX_CONNECTION_INTERVAL then @MAX_CONNECTION_INTERVAL else interval
startWaitingForPing: ->
@clearPingWaitTimeout()
@waitForPingTimeout = setTimeout =>
console.log "Ping took too long to arrive. Reconnecting.."
@reconnect()
, @PING_STALE_INTERVAL * 1000
clearPingWaitTimeout: ->
clearTimeout(@waitForPingTimeout)
resetPingTime: ->
@lastPingTime = null
pingReceived: (timestamp) ->
if @lastPingTime? and (timestamp - @lastPingTime) > @PING_STALE_INTERVAL
console.log "Websocket connection is stale. Reconnecting.."
@reconnect()
else
@startWaitingForPing()
@lastPingTime = timestamp
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