| 17 | } |
| 18 | |
| 19 | export function client<T extends Definition>(target: { |
| 20 | postMessage: (data: string) => void | null |
| 21 | onmessage: ((this: Worker, ev: MessageEvent<any>) => any) | null |
| 22 | }) { |
| 23 | const pending = new Map<number, (result: any) => void>() |
| 24 | const listeners = new Map<string, Set<(data: any) => void>>() |
| 25 | let id = 0 |
| 26 | target.onmessage = async (evt) => { |
| 27 | const parsed = JSON.parse(evt.data) |
| 28 | if (parsed.type === "rpc.result") { |
| 29 | const resolve = pending.get(parsed.id) |
| 30 | if (resolve) { |
| 31 | resolve(parsed.result) |
| 32 | pending.delete(parsed.id) |
| 33 | } |
| 34 | } |
| 35 | if (parsed.type === "rpc.event") { |
| 36 | const handlers = listeners.get(parsed.event) |
| 37 | if (handlers) { |
| 38 | for (const handler of handlers) { |
| 39 | handler(parsed.data) |
| 40 | } |
| 41 | } |
| 42 | } |
| 43 | } |
| 44 | return { |
| 45 | call<Method extends keyof T>(method: Method, input: Parameters<T[Method]>[0]): Promise<ReturnType<T[Method]>> { |
| 46 | const requestId = id++ |
| 47 | return new Promise((resolve) => { |
| 48 | pending.set(requestId, resolve) |
| 49 | target.postMessage(JSON.stringify({ type: "rpc.request", method, input, id: requestId })) |
| 50 | }) |
| 51 | }, |
| 52 | on<Data>(event: string, handler: (data: Data) => void) { |
| 53 | let handlers = listeners.get(event) |
| 54 | if (!handlers) { |
| 55 | handlers = new Set() |
| 56 | listeners.set(event, handlers) |
| 57 | } |
| 58 | handlers.add(handler) |
| 59 | return () => { |
| 60 | handlers!.delete(handler) |
| 61 | } |
| 62 | }, |
| 63 | } |
| 64 | } |
| 65 | |
| 66 | export * as Rpc from "./rpc" |