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import {P2PErrorHandler, P2PHandler, P2PProvider} from './provider'
import {NetMessage, TimeMessage} from './types'
type SetTimeout = (handler: any, timeout: number, ...args: any[]) => number
type TimeoutID = ReturnType<SetTimeout>
export interface P2PClientOptions {
/** P2P provider to use */
provider: P2PProvider
/** heartbeat timout in milliseconds, or undefined if no heartbeat is desired */
heartbeatTimoutMs?: number
/** alternative implementation for setTimeout (mostly for testing) */
setTimeoutImpl?: SetTimeout
}
/**
* @argument message a decoded message from the lower transport layer
*/
export type P2PMessageHandler = (message: NetMessage) => void
type P2PClientEventMap = {
message: P2PMessageHandler
error: P2PErrorHandler
close: P2PHandler
}
export class P2PClient {
static __className = 'P2PClient'
readonly provider: P2PProvider
private setTimeoutImpl: SetTimeout
private heartbeatTimoutMs?: number
private heartbeatTimoutId?: TimeoutID
private eventListeners: {
[T in keyof P2PClientEventMap]?: Array<{
once: boolean
handler: P2PClientEventMap[T]
}>
}
constructor(options: P2PClientOptions) {
Eif (options.provider) {
this.provider = options.provider
} else {
throw new Error('Missing provider')
}
if (options.setTimeoutImpl !== undefined) {
this.setTimeoutImpl = options.setTimeoutImpl
} else {
this.setTimeoutImpl = setTimeout
}
if (options.heartbeatTimoutMs !== undefined) {
this.heartbeatTimoutMs = options.heartbeatTimoutMs
this.resetHeartbeat()
}
this.provider.on('data', (data: Uint8Array) => {
this.handleData(data)
})
this.provider.on('error', (e: any) => {
this.emit('error', [e])
})
this.provider.on('close', () => {
this.emit('close', [])
})
this.eventListeners = {}
}
send(message: NetMessage['value'], done?: P2PHandler): void {
const wrappedMessage = NetMessage.from(message)
const messageBuffer = Serializer.encode({object: wrappedMessage})
this.provider.write(messageBuffer.array, done)
}
end(cb?: P2PHandler): void {
this.endHeartbeat()
this.provider.end(cb)
}
destroy(err?: Error): void {
this.endHeartbeat()
this.provider.destroy(err)
}
private handleData(data: Uint8Array): void {
try {
const message = Serializer.decode({type: NetMessage, data})
this.emit('message', [message])
} catch (e: any) {
this.emit('error', [e])
}
}
private endHeartbeat() {
Iif (this.heartbeatTimoutId !== undefined) {
clearTimeout(this.heartbeatTimoutId)
this.heartbeatTimoutId = undefined
}
}
private resetHeartbeat() {
this.endHeartbeat()
Eif (this.heartbeatTimoutMs !== undefined) {
this.setTimeoutImpl(() => {
this.handleHeartbeat()
}, this.heartbeatTimoutMs)
}
}
private handleHeartbeat() {
const now = Date.now()
const timeMessage = TimeMessage.from({
org: now,
rec: 0,
xmt: 0,
dst: 0,
})
this.send(timeMessage, () => {
this.resetHeartbeat()
})
}
on<T extends keyof P2PClientEventMap>(event: T, handler: P2PClientEventMap[T]): this {
return this.addListenerInternal(event, handler, false, false)
}
once<T extends keyof P2PClientEventMap>(event: T, handler: P2PClientEventMap[T]): this {
return this.addListenerInternal(event, handler, true, false)
}
addListener<T extends keyof P2PClientEventMap>(event: T, handler: P2PClientEventMap[T]): this {
return this.addListenerInternal(event, handler, false, false)
}
prependListener<T extends keyof P2PClientEventMap>(
event: T,
handler: P2PClientEventMap[T]
): this {
return this.addListenerInternal(event, handler, false, true)
}
removeListener<T extends keyof P2PClientEventMap>(
event: T,
handler: P2PClientEventMap[T]
): this {
if (this.eventListeners[event] !== undefined) {
this.eventListeners[event] = this.eventListeners[event]!.filter((e) => {
return e.handler !== handler
}) as (typeof this.eventListeners)[T]
}
return this
}
private addListenerInternal<T extends keyof P2PClientEventMap>(
event: T,
handler: P2PClientEventMap[T],
once: boolean,
prepend: boolean
): this {
Eif (this.eventListeners[event] === undefined) {
this.eventListeners[event] = []
}
Eif (!prepend) {
this.eventListeners[event]!.push({once, handler})
} else {
this.eventListeners[event]!.unshift({once, handler})
}
return this
}
private emit<T extends keyof P2PClientEventMap>(
event: T,
args: Parameters<P2PClientEventMap[T]>
) {
Iif (this.eventListeners[event] === undefined) {
return
}
for (const {handler} of this.eventListeners[event]!) {
// typescript is loosing the specificity provided by T in the assignment above
const erasedHandler = handler as any
erasedHandler(...args)
}
this.eventListeners[event] = this.eventListeners[event]!.filter((e) => {
return e.once !== true
}) as (typeof this.eventListeners)[T]
}
}
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