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import { SocketOptions, Socket, TlsOptions } from 'cloudflare:sockets'
import { EventEmitter } from 'events'
/**
* Wrapper around the Cloudflare built-in socket that can be used by the `Connection`.
*/
export class CloudflareSocket extends EventEmitter {
writable = false
destroyed = false
private _upgrading = false
private _upgraded = false
private _cfSocket: Socket | null = null
private _cfWriter: WritableStreamDefaultWriter | null = null
private _cfReader: ReadableStreamDefaultReader | null = null
constructor(readonly ssl: boolean) {
super()
}
setNoDelay() {
return this
}
setKeepAlive() {
return this
}
ref() {
return this
}
unref() {
return this
}
async connect(port: number, host: string, connectListener?: (...args: unknown[]) => void) {
try {
log('connecting')
if (connectListener) this.once('connect', connectListener)
const options: SocketOptions = this.ssl ? { secureTransport: 'starttls' } : {}
const mod = await import('cloudflare:sockets')
const connect = mod.connect
this._cfSocket = connect(`${host}:${port}`, options)
this._cfWriter = this._cfSocket.writable.getWriter()
this._addClosedHandler()
this._cfReader = this._cfSocket.readable.getReader()
if (this.ssl) {
this._listenOnce().catch((e) => this.emit('error', e))
} else {
this._listen().catch((e) => this.emit('error', e))
}
await this._cfWriter!.ready
log('socket ready')
this.writable = true
this.emit('connect')
return this
} catch (e) {
this.emit('error', e)
}
}
async _listen() {
// eslint-disable-next-line no-constant-condition
while (true) {
log('awaiting receive from CF socket')
const { done, value } = await this._cfReader!.read()
log('CF socket received:', done, value)
if (done) {
log('done')
break
}
this.emit('data', Buffer.from(value))
}
}
async _listenOnce() {
log('awaiting first receive from CF socket')
const { done, value } = await this._cfReader!.read()
log('First CF socket received:', done, value)
this.emit('data', Buffer.from(value))
}
write(
data: Uint8Array | string,
encoding: BufferEncoding = 'utf8',
callback: (...args: unknown[]) => void = () => {}
) {
if (data.length === 0) return callback()
if (typeof data === 'string') data = Buffer.from(data, encoding)
log('sending data direct:', data)
this._cfWriter!.write(data).then(
() => {
log('data sent')
callback()
},
(err) => {
log('send error', err)
callback(err)
}
)
return true
}
end(data = Buffer.alloc(0), encoding: BufferEncoding = 'utf8', callback: (...args: unknown[]) => void = () => {}) {
log('ending CF socket')
this.write(data, encoding, (err) => {
this._cfSocket!.close()
if (callback) callback(err)
})
return this
}
destroy(reason: string) {
log('destroying CF socket', reason)
this.destroyed = true
return this.end()
}
startTls(options: TlsOptions) {
if (this._upgraded) {
// Don't try to upgrade again.
this.emit('error', 'Cannot call `startTls()` more than once on a socket')
return
}
this._cfWriter!.releaseLock()
this._cfReader!.releaseLock()
this._upgrading = true
this._cfSocket = this._cfSocket!.startTls(options)
this._cfWriter = this._cfSocket.writable.getWriter()
this._cfReader = this._cfSocket.readable.getReader()
this._addClosedHandler()
this._listen().catch((e) => this.emit('error', e))
}
_addClosedHandler() {
this._cfSocket!.closed.then(() => {
if (!this._upgrading) {
log('CF socket closed')
this._cfSocket = null
this.emit('close')
} else {
this._upgrading = false
this._upgraded = true
}
}).catch((e) => this.emit('error', e))
}
}
const debug = false
function dump(data: unknown) {
if (data instanceof Uint8Array || data instanceof ArrayBuffer) {
const hex = Buffer.from(data).toString('hex')
const str = new TextDecoder().decode(data)
return `\n>>> STR: "${str.replace(/\n/g, '\\n')}"\n>>> HEX: ${hex}\n`
} else {
return data
}
}
function log(...args: unknown[]) {
debug && console.log(...args.map(dump))
}