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phoenix.js
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phoenix.js
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// Phoenix Channels JavaScript client
//
// ## Socket Connection
//
// A single connection is established to the server and
// channels are multiplexed over the connection.
// Connect to the server using the `Socket` class:
//
// let socket = new Socket("/ws", {params: {userToken: "123"}})
// socket.connect()
//
// The `Socket` constructor takes the mount point of the socket,
// the authentication params, as well as options that can be found in
// the Socket docs, such as configuring the `LongPoll` transport, and
// heartbeat.
//
// ## Channels
//
// Channels are isolated, concurrent processes on the server that
// subscribe to topics and broker events between the client and server.
// To join a channel, you must provide the topic, and channel params for
// authorization. Here's an example chat room example where `"new_msg"`
// events are listened for, messages are pushed to the server, and
// the channel is joined with ok/error/timeout matches:
//
// let channel = socket.channel("room:123", {token: roomToken})
// channel.on("new_msg", msg => console.log("Got message", msg) )
// $input.onEnter( e => {
// channel.push("new_msg", {body: e.target.val}, 10000)
// .receive("ok", (msg) => console.log("created message", msg) )
// .receive("error", (reasons) => console.log("create failed", reasons) )
// .receive("timeout", () => console.log("Networking issue...") )
// })
// channel.join()
// .receive("ok", ({messages}) => console.log("catching up", messages) )
// .receive("error", ({reason}) => console.log("failed join", reason) )
// .receive("timeout", () => console.log("Networking issue. Still waiting...") )
//
//
// ## Joining
//
// Creating a channel with `socket.channel(topic, params)`, binds the params to
// `channel.params`, which are sent up on `channel.join()`.
// Subsequent rejoins will send up the modified params for
// updating authorization params, or passing up last_message_id information.
// Successful joins receive an "ok" status, while unsuccessful joins
// receive "error".
//
// ## Duplicate Join Subscriptions
//
// While the client may join any number of topics on any number of channels,
// the client may only hold a single subscription for each unique topic at any
// given time. When attempting to create a duplicate subscription,
// the server will close the existing channel, log a warning, and
// spawn a new channel for the topic. The client will have their
// `channel.onClose` callbacks fired for the existing channel, and the new
// channel join will have its receive hooks processed as normal.
//
// ## Pushing Messages
//
// From the previous example, we can see that pushing messages to the server
// can be done with `channel.push(eventName, payload)` and we can optionally
// receive responses from the push. Additionally, we can use
// `receive("timeout", callback)` to abort waiting for our other `receive` hooks
// and take action after some period of waiting. The default timeout is 5000ms.
//
//
// ## Socket Hooks
//
// Lifecycle events of the multiplexed connection can be hooked into via
// `socket.onError()` and `socket.onClose()` events, ie:
//
// socket.onError( () => console.log("there was an error with the connection!") )
// socket.onClose( () => console.log("the connection dropped") )
//
//
// ## Channel Hooks
//
// For each joined channel, you can bind to `onError` and `onClose` events
// to monitor the channel lifecycle, ie:
//
// channel.onError( () => console.log("there was an error!") )
// channel.onClose( () => console.log("the channel has gone away gracefully") )
//
// ### onError hooks
//
// `onError` hooks are invoked if the socket connection drops, or the channel
// crashes on the server. In either case, a channel rejoin is attempted
// automatically in an exponential backoff manner.
//
// ### onClose hooks
//
// `onClose` hooks are invoked only in two cases. 1) the channel explicitly
// closed on the server, or 2). The client explicitly closed, by calling
// `channel.leave()`
//
//
// ## Presence
//
// The `Presence` object provides features for syncing presence information
// from the server with the client and handling presences joining and leaving.
//
// ### Syncing initial state from the server
//
// `Presence.syncState` is used to sync the list of presences on the server
// with the client's state. An optional `onJoin` and `onLeave` callback can
// be provided to react to changes in the client's local presences across
// disconnects and reconnects with the server.
//
// `Presence.syncDiff` is used to sync a diff of presence join and leave
// events from the server, as they happen. Like `syncState`, `syncDiff`
// accepts optional `onJoin` and `onLeave` callbacks to react to a user
// joining or leaving from a device.
//
// ### Listing Presences
//
// `Presence.list` is used to return a list of presence information
// based on the local state of metadata. By default, all presence
// metadata is returned, but a `listBy` function can be supplied to
// allow the client to select which metadata to use for a given presence.
// For example, you may have a user online from different devices with a
// a metadata status of "online", but they have set themselves to "away"
// on another device. In this case, they app may choose to use the "away"
// status for what appears on the UI. The example below defines a `listBy`
// function which prioritizes the first metadata which was registered for
// each user. This could be the first tab they opened, or the first device
// they came online from:
//
// let state = {}
// state = Presence.syncState(state, stateFromServer)
// let listBy = (id, {metas: [first, ...rest]}) => {
// first.count = rest.length + 1 // count of this user's presences
// first.id = id
// return first
// }
// let onlineUsers = Presence.list(state, listBy)
//
//
// ### Example Usage
//
// // detect if user has joined for the 1st time or from another tab/device
// let onJoin = (id, current, newPres) => {
// if(!current){
// console.log("user has entered for the first time", newPres)
// } else {
// console.log("user additional presence", newPres)
// }
// }
// // detect if user has left from all tabs/devices, or is still present
// let onLeave = (id, current, leftPres) => {
// if(current.metas.length === 0){
// console.log("user has left from all devices", leftPres)
// } else {
// console.log("user left from a device", leftPres)
// }
// }
// let presences = {} // client's initial empty presence state
// // receive initial presence data from server, sent after join
// myChannel.on("presence_state", state => {
// presences = Presence.syncState(presences, state, onJoin, onLeave)
// displayUsers(Presence.list(presences))
// })
// // receive "presence_diff" from server, containing join/leave events
// myChannel.on("presence_diff", diff => {
// presences = Presence.syncDiff(presences, diff, onJoin, onLeave)
// this.setState({users: Presence.list(room.presences, listBy)})
// })
//
const VSN = "1.0.0"
const SOCKET_STATES = {connecting: 0, open: 1, closing: 2, closed: 3}
const DEFAULT_TIMEOUT = 10000
const CHANNEL_STATES = {
closed: "closed",
errored: "errored",
joined: "joined",
joining: "joining",
leaving: "leaving",
}
const CHANNEL_EVENTS = {
close: "phx_close",
error: "phx_error",
join: "phx_join",
reply: "phx_reply",
leave: "phx_leave"
}
const TRANSPORTS = {
longpoll: "longpoll",
websocket: "websocket"
}
class Push {
// Initializes the Push
//
// channel - The Channel
// event - The event, for example `"phx_join"`
// payload - The payload, for example `{user_id: 123}`
// timeout - The push timeout in milliseconds
//
constructor(channel, event, payload, timeout){
this.channel = channel
this.event = event
this.payload = payload || {}
this.receivedResp = null
this.timeout = timeout
this.timeoutTimer = null
this.recHooks = []
this.sent = false
}
resend(timeout){
this.timeout = timeout
this.cancelRefEvent()
this.ref = null
this.refEvent = null
this.receivedResp = null
this.sent = false
this.send()
}
send(){ if(this.hasReceived("timeout")){ return }
this.startTimeout()
this.sent = true
this.channel.socket.push({
topic: this.channel.topic,
event: this.event,
payload: this.payload,
ref: this.ref
})
}
receive(status, callback){
if(this.hasReceived(status)){
callback(this.receivedResp.response)
}
this.recHooks.push({status, callback})
return this
}
// private
matchReceive({status, response, ref}){
this.recHooks.filter( h => h.status === status )
.forEach( h => h.callback(response) )
}
cancelRefEvent(){ if(!this.refEvent){ return }
this.channel.off(this.refEvent)
}
cancelTimeout(){
clearTimeout(this.timeoutTimer)
this.timeoutTimer = null
}
startTimeout(){ if(this.timeoutTimer){ return }
this.ref = this.channel.socket.makeRef()
this.refEvent = this.channel.replyEventName(this.ref)
this.channel.on(this.refEvent, payload => {
this.cancelRefEvent()
this.cancelTimeout()
this.receivedResp = payload
this.matchReceive(payload)
})
this.timeoutTimer = setTimeout(() => {
this.trigger("timeout", {})
}, this.timeout)
}
hasReceived(status){
return this.receivedResp && this.receivedResp.status === status
}
trigger(status, response){
this.channel.trigger(this.refEvent, {status, response})
}
}
export class Channel {
constructor(topic, params, socket) {
this.state = CHANNEL_STATES.closed
this.topic = topic
this.params = params || {}
this.socket = socket
this.bindings = []
this.timeout = this.socket.timeout
this.joinedOnce = false
this.joinPush = new Push(this, CHANNEL_EVENTS.join, this.params, this.timeout)
this.pushBuffer = []
this.rejoinTimer = new Timer(
() => this.rejoinUntilConnected(),
this.socket.reconnectAfterMs
)
this.joinPush.receive("ok", () => {
this.state = CHANNEL_STATES.joined
this.rejoinTimer.reset()
this.pushBuffer.forEach( pushEvent => pushEvent.send() )
this.pushBuffer = []
})
this.onClose( () => {
this.rejoinTimer.reset()
this.socket.log("channel", `close ${this.topic} ${this.joinRef()}`)
this.state = CHANNEL_STATES.closed
this.socket.remove(this)
})
this.onError( reason => { if(this.isLeaving() || this.isClosed()){ return }
this.socket.log("channel", `error ${this.topic}`, reason)
this.state = CHANNEL_STATES.errored
this.rejoinTimer.scheduleTimeout()
})
this.joinPush.receive("timeout", () => { if(!this.isJoining()){ return }
this.socket.log("channel", `timeout ${this.topic}`, this.joinPush.timeout)
this.state = CHANNEL_STATES.errored
this.rejoinTimer.scheduleTimeout()
})
this.on(CHANNEL_EVENTS.reply, (payload, ref) => {
this.trigger(this.replyEventName(ref), payload)
})
}
rejoinUntilConnected(){
this.rejoinTimer.scheduleTimeout()
if(this.socket.isConnected()){
this.rejoin()
}
}
join(timeout = this.timeout){
if(this.joinedOnce){
throw(`tried to join multiple times. 'join' can only be called a single time per channel instance`)
} else {
this.joinedOnce = true
this.rejoin(timeout)
return this.joinPush
}
}
onClose(callback){ this.on(CHANNEL_EVENTS.close, callback) }
onError(callback){
this.on(CHANNEL_EVENTS.error, reason => callback(reason) )
}
on(event, callback){ this.bindings.push({event, callback}) }
off(event){ this.bindings = this.bindings.filter( bind => bind.event !== event ) }
canPush(){ return this.socket.isConnected() && this.isJoined() }
push(event, payload, timeout = this.timeout){
if(!this.joinedOnce){
throw(`tried to push '${event}' to '${this.topic}' before joining. Use channel.join() before pushing events`)
}
let pushEvent = new Push(this, event, payload, timeout)
if(this.canPush()){
pushEvent.send()
} else {
pushEvent.startTimeout()
this.pushBuffer.push(pushEvent)
}
return pushEvent
}
// Leaves the channel
//
// Unsubscribes from server events, and
// instructs channel to terminate on server
//
// Triggers onClose() hooks
//
// To receive leave acknowledgements, use the a `receive`
// hook to bind to the server ack, ie:
//
// channel.leave().receive("ok", () => alert("left!") )
//
leave(timeout = this.timeout){
this.state = CHANNEL_STATES.leaving
let onClose = () => {
this.socket.log("channel", `leave ${this.topic}`)
this.trigger(CHANNEL_EVENTS.close, "leave", this.joinRef())
}
let leavePush = new Push(this, CHANNEL_EVENTS.leave, {}, timeout)
leavePush.receive("ok", () => onClose() )
.receive("timeout", () => onClose() )
leavePush.send()
if(!this.canPush()){ leavePush.trigger("ok", {}) }
return leavePush
}
// Overridable message hook
//
// Receives all events for specialized message handling
// before dispatching to the channel callbacks.
//
// Must return the payload, modified or unmodified
onMessage(event, payload, ref){ return payload }
// private
isMember(topic){ return this.topic === topic }
joinRef(){ return this.joinPush.ref }
sendJoin(timeout){
this.state = CHANNEL_STATES.joining
this.joinPush.resend(timeout)
}
rejoin(timeout = this.timeout){ if(this.isLeaving()){ return }
this.sendJoin(timeout)
}
trigger(event, payload, ref){
let {close, error, leave, join} = CHANNEL_EVENTS
if(ref && [close, error, leave, join].indexOf(event) >= 0 && ref !== this.joinRef()){
return
}
let handledPayload = this.onMessage(event, payload, ref)
if(payload && !handledPayload){ throw("channel onMessage callbacks must return the payload, modified or unmodified") }
this.bindings.filter( bind => bind.event === event)
.map( bind => bind.callback(handledPayload, ref))
}
replyEventName(ref){ return `chan_reply_${ref}` }
isClosed() { return this.state === CHANNEL_STATES.closed }
isErrored(){ return this.state === CHANNEL_STATES.errored }
isJoined() { return this.state === CHANNEL_STATES.joined }
isJoining(){ return this.state === CHANNEL_STATES.joining }
isLeaving(){ return this.state === CHANNEL_STATES.leaving }
}
export class Socket {
// Initializes the Socket
//
// endPoint - The string WebSocket endpoint, ie, "ws://example.com/ws",
// "wss://example.com"
// "/ws" (inherited host & protocol)
// opts - Optional configuration
// transport - The Websocket Transport, for example WebSocket or Phoenix.LongPoll.
// Defaults to WebSocket with automatic LongPoll fallback.
// timeout - The default timeout in milliseconds to trigger push timeouts.
// Defaults `DEFAULT_TIMEOUT`
// heartbeatIntervalMs - The millisec interval to send a heartbeat message
// reconnectAfterMs - The optional function that returns the millsec
// reconnect interval. Defaults to stepped backoff of:
//
// function(tries){
// return [1000, 5000, 10000][tries - 1] || 10000
// }
//
// logger - The optional function for specialized logging, ie:
// `logger: (kind, msg, data) => { console.log(`${kind}: ${msg}`, data) }
//
// longpollerTimeout - The maximum timeout of a long poll AJAX request.
// Defaults to 20s (double the server long poll timer).
//
// params - The optional params to pass when connecting
//
// For IE8 support use an ES5-shim (https://github.com/es-shims/es5-shim)
//
constructor(endPoint, opts = {}){
this.stateChangeCallbacks = {open: [], close: [], error: [], message: []}
this.channels = []
this.sendBuffer = []
this.ref = 0
this.timeout = opts.timeout || DEFAULT_TIMEOUT
this.transport = opts.transport || window.WebSocket || LongPoll
this.heartbeatIntervalMs = opts.heartbeatIntervalMs || 30000
this.reconnectAfterMs = opts.reconnectAfterMs || function(tries){
return [1000, 2000, 5000, 10000][tries - 1] || 10000
}
this.logger = opts.logger || function(){} // noop
this.longpollerTimeout = opts.longpollerTimeout || 20000
this.params = opts.params || {}
this.endPoint = `${endPoint}/${TRANSPORTS.websocket}`
this.reconnectTimer = new Timer(() => {
this.disconnect(() => this.connect())
}, this.reconnectAfterMs)
}
protocol(){ return location.protocol.match(/^https/) ? "wss" : "ws" }
endPointURL(){
let uri = Ajax.appendParams(
Ajax.appendParams(this.endPoint, this.params), {vsn: VSN})
if(uri.charAt(0) !== "/"){ return uri }
if(uri.charAt(1) === "/"){ return `${this.protocol()}:${uri}` }
return `${this.protocol()}://${location.host}${uri}`
}
disconnect(callback, code, reason){
if(this.conn){
this.conn.onclose = function(){} // noop
if(code){ this.conn.close(code, reason || "") } else { this.conn.close() }
this.conn = null
}
callback && callback()
}
// params - The params to send when connecting, for example `{user_id: userToken}`
connect(params){
if(params){
console && console.log("passing params to connect is deprecated. Instead pass :params to the Socket constructor")
this.params = params
}
if(this.conn){ return }
this.conn = new this.transport(this.endPointURL())
this.conn.timeout = this.longpollerTimeout
this.conn.onopen = () => this.onConnOpen()
this.conn.onerror = error => this.onConnError(error)
this.conn.onmessage = event => this.onConnMessage(event)
this.conn.onclose = event => this.onConnClose(event)
}
// Logs the message. Override `this.logger` for specialized logging. noops by default
log(kind, msg, data){ this.logger(kind, msg, data) }
// Registers callbacks for connection state change events
//
// Examples
//
// socket.onError(function(error){ alert("An error occurred") })
//
onOpen (callback){ this.stateChangeCallbacks.open.push(callback) }
onClose (callback){ this.stateChangeCallbacks.close.push(callback) }
onError (callback){ this.stateChangeCallbacks.error.push(callback) }
onMessage (callback){ this.stateChangeCallbacks.message.push(callback) }
onConnOpen(){
this.log("transport", `connected to ${this.endPointURL()}`)
this.flushSendBuffer()
this.reconnectTimer.reset()
if(!this.conn.skipHeartbeat){
clearInterval(this.heartbeatTimer)
this.heartbeatTimer = setInterval(() => this.sendHeartbeat(), this.heartbeatIntervalMs)
}
this.stateChangeCallbacks.open.forEach( callback => callback() )
}
onConnClose(event){
this.log("transport", "close", event)
this.triggerChanError()
clearInterval(this.heartbeatTimer)
this.reconnectTimer.scheduleTimeout()
this.stateChangeCallbacks.close.forEach( callback => callback(event) )
}
onConnError(error){
this.log("transport", error)
this.triggerChanError()
this.stateChangeCallbacks.error.forEach( callback => callback(error) )
}
triggerChanError(){
this.channels.forEach( channel => channel.trigger(CHANNEL_EVENTS.error) )
}
connectionState(){
switch(this.conn && this.conn.readyState){
case SOCKET_STATES.connecting: return "connecting"
case SOCKET_STATES.open: return "open"
case SOCKET_STATES.closing: return "closing"
default: return "closed"
}
}
isConnected(){ return this.connectionState() === "open" }
remove(channel){
this.channels = this.channels.filter(c => c.joinRef() !== channel.joinRef())
}
channel(topic, chanParams = {}){
let chan = new Channel(topic, chanParams, this)
this.channels.push(chan)
return chan
}
push(data){
let {topic, event, payload, ref} = data
let callback = () => this.conn.send(JSON.stringify(data))
this.log("push", `${topic} ${event} (${ref})`, payload)
if(this.isConnected()){
callback()
}
else {
this.sendBuffer.push(callback)
}
}
// Return the next message ref, accounting for overflows
makeRef(){
let newRef = this.ref + 1
if(newRef === this.ref){ this.ref = 0 } else { this.ref = newRef }
return this.ref.toString()
}
sendHeartbeat(){ if(!this.isConnected()){ return }
this.push({topic: "phoenix", event: "heartbeat", payload: {}, ref: this.makeRef()})
}
flushSendBuffer(){
if(this.isConnected() && this.sendBuffer.length > 0){
this.sendBuffer.forEach( callback => callback() )
this.sendBuffer = []
}
}
onConnMessage(rawMessage){
let msg = JSON.parse(rawMessage.data)
let {topic, event, payload, ref} = msg
this.log("receive", `${payload.status || ""} ${topic} ${event} ${ref && "(" + ref + ")" || ""}`, payload)
this.channels.filter( channel => channel.isMember(topic) )
.forEach( channel => channel.trigger(event, payload, ref) )
this.stateChangeCallbacks.message.forEach( callback => callback(msg) )
}
}
export class LongPoll {
constructor(endPoint){
this.endPoint = null
this.token = null
this.skipHeartbeat = true
this.onopen = function(){} // noop
this.onerror = function(){} // noop
this.onmessage = function(){} // noop
this.onclose = function(){} // noop
this.pollEndpoint = this.normalizeEndpoint(endPoint)
this.readyState = SOCKET_STATES.connecting
this.poll()
}
normalizeEndpoint(endPoint){
return(endPoint
.replace("ws://", "http://")
.replace("wss://", "https://")
.replace(new RegExp("(.*)\/" + TRANSPORTS.websocket), "$1/" + TRANSPORTS.longpoll))
}
endpointURL(){
return Ajax.appendParams(this.pollEndpoint, {token: this.token})
}
closeAndRetry(){
this.close()
this.readyState = SOCKET_STATES.connecting
}
ontimeout(){
this.onerror("timeout")
this.closeAndRetry()
}
poll(){
if(!(this.readyState === SOCKET_STATES.open || this.readyState === SOCKET_STATES.connecting)){ return }
Ajax.request("GET", this.endpointURL(), "application/json", null, this.timeout, this.ontimeout.bind(this), (resp) => {
if(resp){
var {status, token, messages} = resp
this.token = token
} else{
var status = 0
}
switch(status){
case 200:
messages.forEach( msg => this.onmessage({data: JSON.stringify(msg)}) )
this.poll()
break
case 204:
this.poll()
break
case 410:
this.readyState = SOCKET_STATES.open
this.onopen()
this.poll()
break
case 0:
case 500:
this.onerror()
this.closeAndRetry()
break
default: throw(`unhandled poll status ${status}`)
}
})
}
send(body){
Ajax.request("POST", this.endpointURL(), "application/json", body, this.timeout, this.onerror.bind(this, "timeout"), (resp) => {
if(!resp || resp.status !== 200){
this.onerror(resp && resp.status)
this.closeAndRetry()
}
})
}
close(code, reason){
this.readyState = SOCKET_STATES.closed
this.onclose()
}
}
export class Ajax {
static request(method, endPoint, accept, body, timeout, ontimeout, callback){
if(window.XDomainRequest){
let req = new XDomainRequest() // IE8, IE9
this.xdomainRequest(req, method, endPoint, body, timeout, ontimeout, callback)
} else {
let req = window.XMLHttpRequest ?
new XMLHttpRequest() : // IE7+, Firefox, Chrome, Opera, Safari
new ActiveXObject("Microsoft.XMLHTTP") // IE6, IE5
this.xhrRequest(req, method, endPoint, accept, body, timeout, ontimeout, callback)
}
}
static xdomainRequest(req, method, endPoint, body, timeout, ontimeout, callback){
req.timeout = timeout
req.open(method, endPoint)
req.onload = () => {
let response = this.parseJSON(req.responseText)
callback && callback(response)
}
if(ontimeout){ req.ontimeout = ontimeout }
// Work around bug in IE9 that requires an attached onprogress handler
req.onprogress = () => {}
req.send(body)
}
static xhrRequest(req, method, endPoint, accept, body, timeout, ontimeout, callback){
req.timeout = timeout
req.open(method, endPoint, true)
req.setRequestHeader("Content-Type", accept)
req.onerror = () => { callback && callback(null) }
req.onreadystatechange = () => {
if(req.readyState === this.states.complete && callback){
let response = this.parseJSON(req.responseText)
callback(response)
}
}
if(ontimeout){ req.ontimeout = ontimeout }
req.send(body)
}
static parseJSON(resp){
return (resp && resp !== "") ?
JSON.parse(resp) :
null
}
static serialize(obj, parentKey){
let queryStr = [];
for(var key in obj){ if(!obj.hasOwnProperty(key)){ continue }
let paramKey = parentKey ? `${parentKey}[${key}]` : key
let paramVal = obj[key]
if(typeof paramVal === "object"){
queryStr.push(this.serialize(paramVal, paramKey))
} else {
queryStr.push(encodeURIComponent(paramKey) + "=" + encodeURIComponent(paramVal))
}
}
return queryStr.join("&")
}
static appendParams(url, params){
if(Object.keys(params).length === 0){ return url }
let prefix = url.match(/\?/) ? "&" : "?"
return `${url}${prefix}${this.serialize(params)}`
}
}
Ajax.states = {complete: 4}
export var Presence = {
syncState(currentState, newState, onJoin, onLeave){
let state = this.clone(currentState)
let joins = {}
let leaves = {}
this.map(state, (key, presence) => {
if(!newState[key]){
leaves[key] = presence
}
})
this.map(newState, (key, newPresence) => {
let currentPresence = state[key]
if(currentPresence){
let newRefs = newPresence.metas.map(m => m.phx_ref)
let curRefs = currentPresence.metas.map(m => m.phx_ref)
let joinedMetas = newPresence.metas.filter(m => curRefs.indexOf(m.phx_ref) < 0)
let leftMetas = currentPresence.metas.filter(m => newRefs.indexOf(m.phx_ref) < 0)
if(joinedMetas.length > 0){
joins[key] = newPresence
joins[key].metas = joinedMetas
}
if(leftMetas.length > 0){
leaves[key] = this.clone(currentPresence)
leaves[key].metas = leftMetas
}
} else {
joins[key] = newPresence
}
})
return this.syncDiff(state, {joins: joins, leaves: leaves}, onJoin, onLeave)
},
syncDiff(currentState, {joins, leaves}, onJoin, onLeave){
let state = this.clone(currentState)
if(!onJoin){ onJoin = function(){} }
if(!onLeave){ onLeave = function(){} }
this.map(joins, (key, newPresence) => {
let currentPresence = state[key]
state[key] = newPresence
if(currentPresence){
state[key].metas.unshift(...currentPresence.metas)
}
onJoin(key, currentPresence, newPresence)
})
this.map(leaves, (key, leftPresence) => {
let currentPresence = state[key]
if(!currentPresence){ return }
let refsToRemove = leftPresence.metas.map(m => m.phx_ref)
currentPresence.metas = currentPresence.metas.filter(p => {
return refsToRemove.indexOf(p.phx_ref) < 0
})
onLeave(key, currentPresence, leftPresence)
if(currentPresence.metas.length === 0){
delete state[key]
}
})
return state
},
list(presences, chooser){
if(!chooser){ chooser = function(key, pres){ return pres } }
return this.map(presences, (key, presence) => {
return chooser(key, presence)
})
},
// private
map(obj, func){
return Object.getOwnPropertyNames(obj).map(key => func(key, obj[key]))
},
clone(obj){ return JSON.parse(JSON.stringify(obj)) }
}
// Creates a timer that accepts a `timerCalc` function to perform
// calculated timeout retries, such as exponential backoff.
//
// ## Examples
//
// let reconnectTimer = new Timer(() => this.connect(), function(tries){
// return [1000, 5000, 10000][tries - 1] || 10000
// })
// reconnectTimer.scheduleTimeout() // fires after 1000
// reconnectTimer.scheduleTimeout() // fires after 5000
// reconnectTimer.reset()
// reconnectTimer.scheduleTimeout() // fires after 1000
//
class Timer {
constructor(callback, timerCalc){
this.callback = callback
this.timerCalc = timerCalc
this.timer = null
this.tries = 0
}
reset(){
this.tries = 0
clearTimeout(this.timer)
}
// Cancels any previous scheduleTimeout and schedules callback
scheduleTimeout(){
clearTimeout(this.timer)
this.timer = setTimeout(() => {
this.tries = this.tries + 1
this.callback()
}, this.timerCalc(this.tries + 1))
}
}