Rune Harlyk
296 lines
10 KiB
TypeScript
296 lines
10 KiB
TypeScript
import { writable } from 'svelte/store'
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import {
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Message,
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CorrelationRequest,
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CorrelationResponse,
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protoMetadata,
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type MessageFns
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} from '$lib/platform_shared/message'
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import * as Messages from '$lib/platform_shared/message'
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export const MESSAGE_TYPE_TO_KEY = new Map<MessageFns<unknown>, string>()
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export const MESSAGE_TYPE_TO_TAG = new Map<MessageFns<unknown>, number>()
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export const MESSAGE_KEY_TO_TAG = new Map<string, number>()
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export const MESSAGE_TAG_TO_KEY = new Map<number, string>()
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type CorrelationRequestData = Omit<CorrelationRequest, 'correlationId'>
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type PendingRequest = {
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resolve: (response: CorrelationResponse) => void
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reject: (error: Error) => void
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timeoutId: ReturnType<typeof setTimeout>
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}
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const MessageType = protoMetadata.fileDescriptor.messageType?.find(
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(msg: { name: string }) => msg.name === 'Message'
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)
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if (MessageType?.field) {
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for (const field of MessageType.field) {
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if (field.typeName) {
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const messageFns = protoMetadata.references[field.typeName]
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if (messageFns && field.jsonName && field.number) {
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MESSAGE_TYPE_TO_KEY.set(messageFns, field.jsonName)
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MESSAGE_TYPE_TO_TAG.set(messageFns, field.number)
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MESSAGE_KEY_TO_TAG.set(field.jsonName, field.number)
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MESSAGE_TAG_TO_KEY.set(field.number, field.jsonName)
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}
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}
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}
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}
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function getNameFromMessageType<T>(event_type: MessageFns<T>): string {
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const event = MESSAGE_TYPE_TO_KEY.get(event_type as MessageFns<unknown>)
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if (!event) {
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throw new Error(
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"Event type not found in 'Message'. The MessageFns you passed doesn't correspond to any Message field."
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)
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}
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return event
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}
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function getTagFromMessageType<T>(event_type: MessageFns<T>): number {
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const fieldNumber = MESSAGE_TYPE_TO_TAG.get(event_type as MessageFns<unknown>)
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if (fieldNumber === undefined) {
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throw new Error(
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"Tag not found in 'Message'. The MessageFns you passed doesn't correspond to any Message field."
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)
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}
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return fieldNumber
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}
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type SocketEvent = 'open' | 'close' | 'error' | 'message' | 'unresponsive'
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type TaggedMessage = { tag: number; msg: Message }
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export const decodeMessage = (data: ArrayBuffer): TaggedMessage => {
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const decoded = Message.decode(new Uint8Array(data))
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const values = Object.entries(decoded).filter(([, value]) => value !== undefined)
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if (values.length != 1) {
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throw new Error('Message included either 0 or more than 1 data point')
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}
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const fieldName = values[0][0]
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const tag = MESSAGE_KEY_TO_TAG.get(fieldName)
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if (tag === undefined) {
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throw new Error(`Tag not found for field: ${fieldName}`)
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}
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return { tag: tag, msg: decoded }
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}
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export const encodeMessage = (data: Message): Uint8Array<ArrayBuffer> => {
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const encoded = Message.encode(data).finish()
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return encoded
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}
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function createWebSocket() {
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const message_listeners = new Map<number, Set<(data?: unknown) => void>>()
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const event_listeners = new Map<string, Set<(data?: unknown) => void>>()
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const pending_requests = new Map<number, PendingRequest>()
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const queued_requests = new Map<
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string,
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{
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data: CorrelationRequestData
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resolve: (r: CorrelationResponse) => void
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reject: (e: Error) => void
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}
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>()
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const { subscribe, set } = writable(false)
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const reconnectTimeoutTime = 500000
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const requestTimeoutTime = 10000
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let correlationIdCounter = 0
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let unresponsiveTimeoutId: ReturnType<typeof setTimeout>
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let reconnectTimeoutId: ReturnType<typeof setTimeout>
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let ws: WebSocket
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let socketUrl: string | URL
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function getRequestKey(data: CorrelationRequestData): string {
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return (
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Object.keys(data).find(k => data[k as keyof CorrelationRequestData] !== undefined) ??
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'unknown'
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)
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}
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function init(url: string | URL) {
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socketUrl = url
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connect()
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}
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function disconnect(reason: SocketEvent, event?: Event) {
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ws.close()
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set(false)
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clearTimeout(unresponsiveTimeoutId)
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clearTimeout(reconnectTimeoutId)
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event_listeners.get(reason)?.forEach(listener => listener(event))
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reconnectTimeoutId = setTimeout(connect, reconnectTimeoutTime)
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}
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function connect() {
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ws = new WebSocket(socketUrl)
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ws.binaryType = 'arraybuffer'
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ws.onopen = ev => {
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ping()
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set(true)
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clearTimeout(reconnectTimeoutId)
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resubscribeAll()
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flushQueuedRequests()
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event_listeners.get('open')?.forEach(listener => listener(ev))
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}
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ws.onmessage = frame => {
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resetUnresponsiveCheck()
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const { tag, msg } = decodeMessage(frame.data)
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if (msg.correlationResponse) {
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const pending = pending_requests.get(msg.correlationResponse.correlationId)
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if (pending) {
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clearTimeout(pending.timeoutId)
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pending_requests.delete(msg.correlationResponse.correlationId)
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pending.resolve(msg.correlationResponse)
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}
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return
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}
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if (tag) {
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const key = MESSAGE_TAG_TO_KEY.get(tag)!
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message_listeners
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.get(tag)
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?.forEach(listener => listener(msg[key as keyof typeof msg]))
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}
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}
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ws.onerror = ev => disconnect('error', ev)
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ws.onclose = ev => disconnect('close', ev)
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}
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function unsubscribe<MT>(event_type: MessageFns<MT>, listener: (data: MT) => void) {
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const tag = getTagFromMessageType(event_type)
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const message_listeners_totag = message_listeners.get(tag)
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if (!message_listeners_totag) return
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message_listeners_totag?.delete(listener as (data?: unknown) => void)
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if (message_listeners_totag.size == 0) {
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unsubscribeToMessageFromServer(event_type)
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}
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}
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function unsubscribeEvent(event_type: SocketEvent, listener: (data: unknown) => void) {
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const message_listeners_totag = event_listeners.get(event_type)
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if (!message_listeners_totag) return
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message_listeners_totag?.delete(listener)
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}
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function resetUnresponsiveCheck() {
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clearTimeout(unresponsiveTimeoutId)
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unresponsiveTimeoutId = setTimeout(() => disconnect('unresponsive'), reconnectTimeoutTime)
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}
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function emit<T>(event: MessageFns<T>, data: T) {
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if (!ws || ws.readyState !== WebSocket.OPEN) return
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const type = getNameFromMessageType(event)
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const wsm = Message.create() as Record<string, unknown>
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wsm[type] = data
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send(wsm as Message)
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}
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function unsubscribeToMessageFromServer<T>(event_type: MessageFns<T>) {
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if (!ws || ws.readyState !== WebSocket.OPEN) return
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const unsub_msg = Messages.UnsubscribeNotification.create({
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tag: getTagFromMessageType(event_type)
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})
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send(Message.create({ unsubNotif: unsub_msg }))
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}
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function subscribeToEvent<T>(event_type: MessageFns<T>) {
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if (!ws || ws.readyState !== WebSocket.OPEN) return
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const sub_msg = Messages.SubscribeNotification.create({
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tag: getTagFromMessageType(event_type)
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})
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send(Message.create({ subNotif: sub_msg }))
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}
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function resubscribeAll() {
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for (const tag of message_listeners.keys()) {
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const sub_msg = Messages.SubscribeNotification.create({ tag })
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send(Message.create({ subNotif: sub_msg }))
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}
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}
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function send(data: Message) {
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if (!ws || ws.readyState !== WebSocket.OPEN) return
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const encoded = encodeMessage(data)
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ws.send(encoded)
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}
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function ping() {
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send(Message.create({ pingmsg: {} }))
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}
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function request(
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data: CorrelationRequestData,
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resolve: (r: CorrelationResponse) => void,
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reject: (e: Error) => void
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) {
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const correlationId = ++correlationIdCounter
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const timeoutId = setTimeout(() => {
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pending_requests.delete(correlationId)
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reject(new Error(`Request timeout (id: ${correlationId})`))
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}, requestTimeoutTime)
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pending_requests.set(correlationId, { resolve, reject, timeoutId })
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const request = CorrelationRequest.create({ correlationId, ...data })
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send(Message.create({ correlationRequest: request }))
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}
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function flushQueuedRequests() {
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for (const [, { data, resolve, reject }] of queued_requests) {
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request(data, resolve, reject)
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}
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queued_requests.clear()
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}
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return {
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subscribe,
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emit,
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init,
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on: <MT>(event_type: MessageFns<MT>, listener: (data: MT) => void): (() => void) => {
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const tag = getTagFromMessageType(event_type)
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let message_listeners_totag = message_listeners.get(tag)
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if (!message_listeners_totag) {
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message_listeners_totag = new Set()
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message_listeners.set(tag, message_listeners_totag)
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subscribeToEvent(event_type)
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}
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message_listeners_totag.add(listener as (data: unknown) => void)
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return () => {
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unsubscribe(event_type, listener)
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}
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},
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onEvent: (event_type: SocketEvent, listener: (data: unknown) => void): (() => void) => {
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let listeners = event_listeners.get(event_type)
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if (!listeners) {
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listeners = new Set()
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event_listeners.set(event_type, listeners)
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}
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listeners.add(listener)
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return () => {
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unsubscribeEvent(event_type, listener)
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}
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},
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request: (data: CorrelationRequestData): Promise<CorrelationResponse> => {
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return new Promise((resolve, reject) => {
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if (ws && ws.readyState === WebSocket.OPEN) {
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request(data, resolve, reject)
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} else {
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const key = getRequestKey(data)
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const existing = queued_requests.get(key)
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if (existing) {
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existing.reject(new Error('Request superseded by newer request'))
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}
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queued_requests.set(key, { data, resolve, reject })
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}
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})
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}
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}
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}
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export const socket = createWebSocket()
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