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import adapters from "./adapters"
import ConnectionMonitor from "./connection_monitor"
import INTERNAL from "./internal"
import logger from "./logger"
// Encapsulate the cable connection held by the consumer. This is an internal class not intended for direct user manipulation.
const {message_types, protocols} = INTERNAL
const supportedProtocols = protocols.slice(0, protocols.length - 1)
const indexOf = [].indexOf
class Connection {
constructor(consumer) {
this.open = this.open.bind(this)
this.consumer = consumer
this.subscriptions = this.consumer.subscriptions
this.monitor = new ConnectionMonitor(this)
this.disconnected = true
}
send(data) {
if (this.isOpen()) {
this.webSocket.send(JSON.stringify(data))
return true
} else {
return false
}
}
open() {
if (this.isActive()) {
logger.log(`Attempted to open WebSocket, but existing socket is ${this.getState()}`)
return false
} else {
logger.log(`Opening WebSocket, current state is ${this.getState()}, subprotocols: ${protocols}`)
if (this.webSocket) { this.uninstallEventHandlers() }
this.webSocket = new adapters.WebSocket(this.consumer.url, protocols)
this.installEventHandlers()
this.monitor.start()
return true
}
}
close({allowReconnect} = {allowReconnect: true}) {
if (!allowReconnect) { this.monitor.stop() }
if (this.isActive()) { return (this.webSocket ? this.webSocket.close() : undefined) }
}
reopen() {
logger.log(`Reopening WebSocket, current state is ${this.getState()}`)
if (this.isActive()) {
try {
return this.close()
} catch (error) {
logger.log("Failed to reopen WebSocket", error)
}
finally {
logger.log(`Reopening WebSocket in ${this.constructor.reopenDelay}ms`)
setTimeout(this.open, this.constructor.reopenDelay)
}
} else {
return this.open()
}
}
getProtocol() {
return (this.webSocket ? this.webSocket.protocol : undefined)
}
isOpen() {
return this.isState("open")
}
isActive() {
return this.isState("open", "connecting")
}
// Private
isProtocolSupported() {
return indexOf.call(supportedProtocols, this.getProtocol()) >= 0
}
isState(...states) {
return indexOf.call(states, this.getState()) >= 0
}
getState() {
if (this.webSocket) {
for (let state in WebSocket) {
if (WebSocket[state] === this.webSocket.readyState) {
return state.toLowerCase()
}
}
}
return null
}
installEventHandlers() {
for (let eventName in this.events) {
const handler = this.events[eventName].bind(this)
this.webSocket[`on${eventName}`] = handler
}
}
uninstallEventHandlers() {
for (let eventName in this.events) {
this.webSocket[`on${eventName}`] = function() {}
}
}
}
Connection.reopenDelay = 500
Connection.prototype.events = {
message(event) {
if (!this.isProtocolSupported()) { return }
const {identifier, message, type} = JSON.parse(event.data)
switch (type) {
case message_types.welcome:
this.monitor.recordConnect()
return this.subscriptions.reload()
case message_types.ping:
return this.monitor.recordPing()
case message_types.confirmation:
return this.subscriptions.notify(identifier, "connected")
case message_types.rejection:
return this.subscriptions.reject(identifier)
default:
return this.subscriptions.notify(identifier, "received", message)
}
},
open() {
logger.log(`WebSocket onopen event, using '${this.getProtocol()}' subprotocol`)
this.disconnected = false
if (!this.isProtocolSupported()) {
logger.log("Protocol is unsupported. Stopping monitor and disconnecting.")
return this.close({allowReconnect: false})
}
},
close(event) {
logger.log("WebSocket onclose event")
if (this.disconnected) { return }
this.disconnected = true
this.monitor.recordDisconnect()
return this.subscriptions.notifyAll("disconnected", {willAttemptReconnect: this.monitor.isRunning()})
},
error() {
logger.log("WebSocket onerror event")
}
}
export default Connection
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