478 lines
16 KiB
Swift
478 lines
16 KiB
Swift
//
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// SocketIOClient.swift
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// Socket.IO-Swift
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//
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// Created by Erik Little on 11/23/14.
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//
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import Foundation
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private class EventHandler: NSObject {
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let event:String!
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let callback:((data:AnyObject?) -> Void)!
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init(event:String, callback:((data:AnyObject?) -> Void)?) {
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self.event = event
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self.callback = callback
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}
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func executeCallback(args:AnyObject?) {
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if (args != nil) {
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callback(data: args!)
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} else {
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callback(data: nil)
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}
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}
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}
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private struct Event {
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var event:String!
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var args:AnyObject!
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var placeholders:Int!
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var currentPlace = 0
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init(event:String, args:AnyObject?, placeholders:Int = 0) {
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self.event = event
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self.args = args?
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self.placeholders = placeholders
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}
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func createMessage() -> String {
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var array = "42["
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array += "\"" + event + "\""
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if (args? != nil) {
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if (args is NSDictionary) {
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array += ","
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var jsonSendError:NSError?
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var jsonSend = NSJSONSerialization.dataWithJSONObject(args as NSDictionary,
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options: NSJSONWritingOptions(0), error: &jsonSendError)
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var jsonString = NSString(data: jsonSend!, encoding: NSUTF8StringEncoding)
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return array + jsonString! + "]"
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} else {
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array += ",\"\(args!)\""
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return array + "]"
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}
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} else {
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return array + "]"
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}
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}
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func createBinaryMessage() -> String {
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var array = "45\(self.placeholders)-["
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array += "\"" + event + "\""
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if (args? != nil) {
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if (args is NSDictionary) {
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array += ","
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var jsonSendError:NSError?
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var jsonSend = NSJSONSerialization.dataWithJSONObject(args as NSDictionary,
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options: NSJSONWritingOptions(0), error: &jsonSendError)
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var jsonString = NSString(data: jsonSend!, encoding: NSUTF8StringEncoding)
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return array + jsonString! + "]"
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} else {
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array += ",\"\(args!)\""
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return array + "]"
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}
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} else {
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return array + "]"
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}
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}
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mutating func fillInPlaceHolder(data:NSData) -> Bool {
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func checkDoEvent() -> Bool {
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if (self.placeholders == self.currentPlace) {
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return true
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} else {
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return false
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}
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}
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if (checkDoEvent()) {
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return true
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}
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if let stringArgs = args as? String {
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let mutStringArgs = RegexMutable(stringArgs)
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let base64 = data.base64EncodedStringWithOptions(NSDataBase64EncodingOptions.allZeros)
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let placeHolder = "~~" + String(self.currentPlace)
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self.args = mutStringArgs[placeHolder] ~= "\"" + base64 + "\""
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self.currentPlace++
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return checkDoEvent()
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}
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return false
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}
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}
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class SocketIOClient: NSObject, SRWebSocketDelegate {
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let socketURL:String!
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let secure:Bool!
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private var handlers = [EventHandler]()
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private var lastSocketMessage:Event?
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var connected = false
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var connecting = false
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var io:SRWebSocket?
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var pingTimer:NSTimer!
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var reconnnects = true
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var reconnecting = false
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var reconnectAttempts = 10
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var reconnectWait = 10
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init(socketURL:String, opts:[String: AnyObject]? = nil) {
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super.init()
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var mutURL = RegexMutable(socketURL)
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if (mutURL["https://"].matches().count != 0) {
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self.secure = true
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} else {
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self.secure = false
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}
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mutURL = mutURL["http://"] ~= ""
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mutURL = mutURL["https://"] ~= ""
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self.socketURL = mutURL
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// Set options
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if (opts != nil) {
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if let reconnects = opts!["reconnects"] as? Bool {
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self.reconnnects = reconnects
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}
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if let reconnectAttempts = opts!["reconnectAttempts"] as? Int {
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self.reconnectAttempts = abs(reconnectAttempts)
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}
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if let reconnectWait = opts!["reconnectWait"] as? Int {
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self.reconnectWait = abs(reconnectWait)
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}
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}
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}
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// Closes the socket
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func close() {
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self.pingTimer?.invalidate()
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self.connecting = false
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self.connected = false
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self.reconnnects = false
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self.io?.close()
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}
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// Connects to the server
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func connect() {
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self.connecting = true
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var endpoint:String!
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if (self.secure!) {
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endpoint = "wss://\(self.socketURL)/socket.io/?EIO=2&transport=websocket"
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} else {
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endpoint = "ws://\(self.socketURL)/socket.io/?EIO=2&transport=websocket"
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}
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self.io = SRWebSocket(URL: NSURL(string: endpoint))
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self.io?.delegate = self
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self.io?.open()
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}
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// Creates a binary message, ready for sending
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private func createBinaryDataForSend(data:NSData) -> NSData {
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var byteArray = [UInt8](count: 1, repeatedValue: 0x0)
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byteArray[0] = 4
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var mutData = NSMutableData(bytes: &byteArray, length: 1)
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mutData.appendData(data)
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return mutData
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}
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// Sends a message
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func emit(event:String, args:AnyObject? = nil) {
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if (!self.connected) {
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return
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}
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var frame:Event!
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var str:String!
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if let dict = args as? NSDictionary {
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// Check for binary data
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let (newDict, hadBinary, binaryDatas) = self.parseNSDictionary(dict: dict)
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if (hadBinary) {
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frame = Event(event: event, args: newDict, placeholders: binaryDatas!.count)
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str = frame.createBinaryMessage()
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self.io?.send(str)
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for data in binaryDatas! {
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let sendData = self.createBinaryDataForSend(data)
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self.io?.send(sendData)
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}
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return
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}
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} else if let binaryData = args as? NSData {
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// args is just binary
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frame = Event(event: event, args: ["_placeholder": true, "num": 0], placeholders: 1)
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str = frame.createBinaryMessage()
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self.io?.send(str)
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let sendData = self.createBinaryDataForSend(binaryData)
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self.io?.send(sendData)
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return
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}
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frame = Event(event: event, args: args)
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str = frame.createMessage()
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// println("Sending: \(str)")
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self.io?.send(str)
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}
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// Handles events
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func handleEvent(#event:String, var data:AnyObject?) {
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// println("Should do event: \(event) with data: \(data)")
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// data = parseData(data as? String)
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for handler in self.handlers {
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if (handler.event == event) {
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if (data == nil) {
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handler.executeCallback(nil)
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continue
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}
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handler.executeCallback(data)
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}
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}
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}
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// Adds handlers to the socket
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func on(name:String, callback:((data:AnyObject?) -> Void)?) {
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let handler = EventHandler(event: name, callback: callback)
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self.handlers.append(handler)
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}
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// Opens the connection to the socket
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func open() {
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self.connect()
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}
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// Parses data for events
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private func parseData(data:String?) -> AnyObject? {
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if (data == nil) {
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return nil
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}
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var err:NSError?
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let stringData = data!.dataUsingEncoding(NSUTF8StringEncoding, allowLossyConversion: false)
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let parsed:AnyObject? = NSJSONSerialization.JSONObjectWithData(stringData!,
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options: NSJSONReadingOptions.AllowFragments, error: &err)
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if (err != nil) {
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// println(err)
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return nil
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}
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return parsed
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}
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// Parses a NSDictionary, looking for NSData objects
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private func parseNSDictionary(#dict:NSDictionary) -> (NSDictionary, Bool, [NSData]?) {
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var returnDict = NSMutableDictionary()
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var placeholder = 0
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var containedData = false
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var returnDatas = [NSData]()
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for (key, value) in dict {
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if let binaryData = value as? NSData {
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containedData = true
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returnDatas.append(binaryData)
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returnDict[key as String] = ["_placeholder": true, "num": placeholder]
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placeholder++
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} else {
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returnDict[key as String] = value
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}
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}
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if (containedData) {
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return (returnDict, true, returnDatas)
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} else {
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return (returnDict, false, nil)
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}
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}
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// Parses messages recieved
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private func parseSocketMessage(#message:AnyObject?) {
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if (message == nil) {
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return
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}
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// println(message!)
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if let stringMessage = message as? String {
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/**
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Begin check for socket info frame
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**/
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var mutMessage = RegexMutable(stringMessage)
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var setup:String!
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let messageData = mutMessage["(\\d*)(\\{.*\\})?"].groups()
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if (messageData != nil && messageData[1] == "0") {
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setup = messageData[2]
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let data = setup.dataUsingEncoding(NSUTF8StringEncoding)!
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var jsonError:NSError?
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if let json:AnyObject? = NSJSONSerialization.JSONObjectWithData(data,
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options: nil, error: &jsonError) {
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self.startPingTimer(interval: (json!["pingInterval"] as Int) / 1000)
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return
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}
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}
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/**
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End check for socket info frame
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**/
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/**
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Begin check for message
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**/
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let messageGroups = mutMessage["(\\d*)(\\[.*\\])?"].groups()
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if (messageGroups.count == 3 && messageGroups[1] == "42") {
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let messagePart = messageGroups[2]
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let messageInternals = RegexMutable(messagePart)["\\[\"(.*?)\",(.*?)?\\]$"].groups()
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if (messageInternals != nil && messageInternals.count > 2) {
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let event = messageInternals[1]
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var data:String?
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if (messageInternals[2] == "") {
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data = nil
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} else {
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data = messageInternals[2]
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}
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if let json:AnyObject = self.parseData(data) {
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self.handleEvent(event: event, data: json)
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return
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}
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self.handleEvent(event: event, data: data)
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return
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}
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}
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/**
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End Check for message
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**/
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// Check for message with binary placeholders
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self.parseBinaryMessage(message: message!)
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}
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// Message is binary
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if let binary = message as? NSData {
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self.parseBinaryData(binary)
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}
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}
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// Tries to parse a message that contains binary
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func parseBinaryMessage(#message:AnyObject) {
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if let stringMessage = message as? String {
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var mutMessage = RegexMutable(stringMessage)
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/**
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Begin check for binary placeholder
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**/
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let binaryGroup = mutMessage["(\\d*)-\\[\"(.*)\",(\\{.*\\})\\]$"].groups()
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// println(binaryGroup)
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if (binaryGroup != nil) {
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let messageType = RegexMutable(binaryGroup[1])
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let numberOfPlaceholders = messageType["45"] ~= ""
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let event = binaryGroup[2]
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let mutMessageObject = RegexMutable(binaryGroup[3])
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let placeholdersRemoved = mutMessageObject["(\\{\"_placeholder\":true,\"num\":(\\d*)\\})"] ~= "~~$2"
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let mes = Event(event: event, args: placeholdersRemoved,
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placeholders: numberOfPlaceholders.integerValue)
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self.lastSocketMessage = mes
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return
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}
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/**
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End check for binary placeholder
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**/
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}
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}
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// Handles binary data
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func parseBinaryData(data:NSData) {
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if (self.lastSocketMessage == nil) {
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return
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}
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let shouldExecute = self.lastSocketMessage?.fillInPlaceHolder(data)
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var event = self.lastSocketMessage!.event
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var args:AnyObject? = self.parseData(self.lastSocketMessage!.args as? String)
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if (shouldExecute != nil && shouldExecute!) {
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self.handleEvent(event: event, data: args)
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}
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}
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// Sends ping
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func sendPing() {
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if (!self.connected) {
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return
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}
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self.io?.send("2")
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}
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// Starts the ping timer
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private func startPingTimer(#interval:Int) {
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self.pingTimer = NSTimer.scheduledTimerWithTimeInterval(NSTimeInterval(interval), target: self,
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selector: Selector("sendPing"), userInfo: nil, repeats: true)
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}
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// We lost connection and should attempt to reestablish
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private func tryReconnect(#triesLeft:Int) {
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if (triesLeft <= 0) {
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self.connecting = false
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self.reconnnects = false
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self.reconnecting = false
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self.handleEvent(event: "disconnect", data: "Failed to reconnect")
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return
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} else if (self.connected) {
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self.connecting = false
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self.reconnecting = false
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return
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}
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// println("Trying to reconnect #\(reconnectAttempts - triesLeft)")
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let waitTime = UInt64(self.reconnectWait) * NSEC_PER_SEC
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let time = dispatch_time(DISPATCH_TIME_NOW, Int64(waitTime))
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// Wait reconnectWait seconds and then check if connected. Repeat if not
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dispatch_after(time, dispatch_get_main_queue()) {[weak self] in
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if (self == nil || self!.connected) {
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return
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}
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self!.tryReconnect(triesLeft: triesLeft - 1)
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}
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self.reconnecting = true
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self.connect()
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}
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// Called when a message is recieved
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func webSocket(webSocket:SRWebSocket!, didReceiveMessage message:AnyObject?) {
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// println(message)
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self.parseSocketMessage(message: message)
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}
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// Called when the socket is opened
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func webSocketDidOpen(webSocket:SRWebSocket!) {
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self.connecting = false
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self.reconnecting = false
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self.connected = true
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self.handleEvent(event: "connect", data: nil)
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}
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// Called when the socket is closed
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func webSocket(webSocket:SRWebSocket!, didCloseWithCode code:Int, reason:String!, wasClean:Bool) {
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self.pingTimer?.invalidate()
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self.connected = false
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self.connecting = false
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if (!self.reconnnects) {
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self.handleEvent(event: "disconnect", data: reason)
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} else {
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self.handleEvent(event: "reconnect", data: reason)
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self.tryReconnect(triesLeft: self.reconnectAttempts)
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}
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}
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func webSocket(webSocket:SRWebSocket!, didFailWithError error:NSError!) {
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self.pingTimer?.invalidate()
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self.connected = false
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self.connecting = false
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if (!self.reconnnects) {
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self.handleEvent(event: "disconnect", data: error.localizedDescription)
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} else if (!self.reconnecting) {
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self.handleEvent(event: "reconnect", data: error.localizedDescription)
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self.tryReconnect(triesLeft: self.reconnectAttempts)
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}
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}
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} |