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Remove unused class

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I managed to lose this deletion in a merge.
This commit is contained in:
Asher 2020-04-28 13:13:35 -05:00
parent a96606e589
commit 4cfd7c50ad
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1 changed files with 0 additions and 204 deletions
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src/browser/socket.ts
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@ -1,204 +0,0 @@
import { field, logger, Logger } from "@coder/logger"
import { Emitter } from "../common/emitter"
import { generateUuid } from "../common/util"
const decoder = new TextDecoder("utf8")
export const decode = (buffer: string | ArrayBuffer): string => {
return typeof buffer !== "string" ? decoder.decode(buffer) : buffer
}
/**
* A web socket that reconnects itself when it closes. Sending messages while
* disconnected will throw an error.
*/
export class ReconnectingSocket {
protected readonly _onMessage = new Emitter<string | ArrayBuffer>()
public readonly onMessage = this._onMessage.event
protected readonly _onDisconnect = new Emitter<number | undefined>()
public readonly onDisconnect = this._onDisconnect.event
protected readonly _onClose = new Emitter<number | undefined>()
public readonly onClose = this._onClose.event
protected readonly _onConnect = new Emitter<void>()
public readonly onConnect = this._onConnect.event
// This helps distinguish messages between sockets.
private readonly logger: Logger
private socket?: WebSocket
private connecting?: Promise<void>
private closed = false
private readonly openTimeout = 10000
// Every time the socket fails to connect, the retry will be increasingly
// delayed up to a maximum.
private readonly retryBaseDelay = 1000
private readonly retryMaxDelay = 10000
private retryDelay?: number
private readonly retryDelayFactor = 1.5
// The socket must be connected for this amount of time before resetting the
// retry delay. This prevents rapid retries when the socket does connect but
// is closed shortly after.
private resetRetryTimeout?: NodeJS.Timeout
private readonly resetRetryDelay = 10000
private _binaryType: typeof WebSocket.prototype.binaryType = "arraybuffer"
public constructor(private path: string, public readonly id: string = generateUuid(4)) {
// On Firefox the socket seems to somehow persist a page reload so the close
// event runs and we see "attempting to reconnect".
if (typeof window !== "undefined") {
window.addEventListener("beforeunload", () => this.close())
}
this.logger = logger.named(this.id)
}
public set binaryType(b: typeof WebSocket.prototype.binaryType) {
this._binaryType = b
if (this.socket) {
this.socket.binaryType = b
}
}
/**
* Permanently close the connection. Will not attempt to reconnect. Will
* remove event listeners.
*/
public close(code?: number): void {
if (this.closed) {
return
}
if (code) {
this.logger.info(`closing with code ${code}`)
}
if (this.resetRetryTimeout) {
clearTimeout(this.resetRetryTimeout)
}
this.closed = true
if (this.socket) {
this.socket.close()
} else {
this._onClose.emit(code)
}
}
public dispose(): void {
this._onMessage.dispose()
this._onDisconnect.dispose()
this._onClose.dispose()
this._onConnect.dispose()
this.logger.debug("disposed handlers")
}
/**
* Send a message on the socket. Logs an error if currently disconnected.
*/
public send(message: string | ArrayBuffer): void {
this.logger.trace(() => ["sending message", field("message", decode(message))])
if (!this.socket) {
return logger.error("tried to send message on closed socket")
}
this.socket.send(message)
}
/**
* Connect to the socket. Can also be called to wait until the connection is
* established in the case of disconnections. Multiple calls will be handled
* correctly.
*/
public async connect(): Promise<void> {
if (!this.connecting) {
this.connecting = new Promise((resolve, reject) => {
const tryConnect = (): void => {
if (this.closed) {
return reject(new Error("disconnected")) // Don't keep trying if we've closed permanently.
}
if (typeof this.retryDelay === "undefined") {
this.retryDelay = 0
} else {
this.retryDelay = this.retryDelay * this.retryDelayFactor || this.retryBaseDelay
if (this.retryDelay > this.retryMaxDelay) {
this.retryDelay = this.retryMaxDelay
}
}
this._connect()
.then((socket) => {
this.logger.info("connected")
this.socket = socket
this.socket.binaryType = this._binaryType
if (this.resetRetryTimeout) {
clearTimeout(this.resetRetryTimeout)
}
this.resetRetryTimeout = setTimeout(() => (this.retryDelay = undefined), this.resetRetryDelay)
this.connecting = undefined
this._onConnect.emit()
resolve()
})
.catch((error) => {
this.logger.error(`failed to connect: ${error.message}`)
tryConnect()
})
}
tryConnect()
})
}
return this.connecting
}
private async _connect(): Promise<WebSocket> {
const socket = await new Promise<WebSocket>((resolve, _reject) => {
if (this.retryDelay) {
this.logger.info(`retrying in ${this.retryDelay}ms...`)
}
setTimeout(() => {
this.logger.info("connecting...", field("path", this.path))
const socket = new WebSocket(this.path)
const reject = (): void => {
_reject(new Error("socket closed"))
}
const timeout = setTimeout(() => {
// eslint-disable-next-line @typescript-eslint/no-use-before-define
socket.removeEventListener("open", open)
socket.removeEventListener("close", reject)
_reject(new Error("timeout"))
}, this.openTimeout)
const open = (): void => {
clearTimeout(timeout)
socket.removeEventListener("close", reject)
resolve(socket)
}
socket.addEventListener("open", open)
socket.addEventListener("close", reject)
}, this.retryDelay)
})
socket.addEventListener("message", (event) => {
this.logger.trace(() => ["got message", field("message", decode(event.data))])
this._onMessage.emit(event.data)
})
socket.addEventListener("close", (event) => {
this.socket = undefined
if (!this.closed) {
this._onDisconnect.emit(event.code)
// It might be closed in the event handler.
if (!this.closed) {
this.logger.info("connection closed; attempting to reconnect")
this.connect()
}
} else {
this._onClose.emit(event.code)
this.logger.info("connection closed permanently")
}
})
return socket
}
}