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7.9 kB · 184 lines
TypeScript
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185import { Effect, Fiber, FiberSet, Queue, Stream } from "effect"import { SimulationProtocol } from "./protocol"
export interface Server { readonly url: string}
interface Request { readonly id?: string | number | null}
export interface SocketData { readonly drive?: true attachment?: Fiber.Fiber<void> closed?: true}
export interface Socket { readonly data: SocketData readonly send: (message: string) => Effect.Effect<void>}
const maxOutboundBytes = 64 * 1024 * 1024
export function start<RequestType extends Request, Error, Services>(options: { readonly endpoint: string readonly label: string readonly data: () => SocketData readonly decode: (input: string) => Effect.Effect<RequestType, Error> readonly handle: (socket: Socket, request: RequestType) => Effect.Effect<unknown, unknown, Services> readonly close?: (socket: Socket) => Effect.Effect<void, never, Services>}) { return Effect.gen(function* () { const messages = yield* Queue.bounded<{ readonly socket: Socket; readonly input: string }>(256) yield* Stream.fromQueue(messages).pipe( Stream.runForEach((message) => options.decode(message.input).pipe( Effect.flatMap((request) => options.handle(message.socket, request).pipe( Effect.matchEffect({ onFailure: (error) => send(message.socket, SimulationProtocol.JsonRpc.failure(request.id, error)), onSuccess: (result) => send(message.socket, SimulationProtocol.JsonRpc.success(request.id, result)), }), ), ), Effect.catch((error) => send(message.socket, SimulationProtocol.JsonRpc.failure(undefined, error))), Effect.catchCause((cause) => Effect.logWarning(`${options.label}: request failed`, cause)), ), ), Effect.forkScoped, ) const url = yield* Effect.try({ try: () => new URL(options.endpoint), catch: (cause) => cause }) const websocket = yield* Effect.promise(() => import("ws")) const runPromise = yield* FiberSet.makeRuntimePromise<Services, void, never>() yield* Effect.acquireRelease( Effect.tryPromise( () => new Promise<{ readonly close: () => Promise<void> }>((resolve, reject) => { const server = new websocket.WebSocketServer({ host: url.hostname, port: Number(url.port) }) const sockets = new Map< InstanceType<typeof websocket.WebSocket>, { socket: Socket; cleanup: () => Promise<void> } >() const report = (scope: string, cause: unknown) => void runPromise(Effect.logWarning(`${options.label}: ${scope} error`, cause)) const onServerError = (cause: Error) => report("server", cause) const onStartupError = (cause: Error) => { server.off("listening", onListening) server.on("error", onServerError) reject(cause) } const onListening = () => { server.off("error", onStartupError) server.on("error", onServerError) resolve({ close: async () => { const accepted = Array.from(sockets.entries()) accepted.forEach(([connection, record]) => { record.socket.data.closed = true connection.terminate() }) await Promise.all([ new Promise<void>((resolveClose, rejectClose) => { server.close((cause) => (cause ? rejectClose(cause) : resolveClose())) // Bun releases the listener but does not invoke ws' close callback after an upgraded socket. queueMicrotask(() => { if (server.address() === null) resolveClose() }) }), Promise.all(accepted.map(([, record]) => record.cleanup())), ]) server.off("error", onServerError) }, }) } server.once("listening", onListening) server.once("error", onStartupError) server.on("connection", (connection) => { let pendingBytes = 0 let outbound = Promise.resolve() let cleanup: Promise<void> | undefined const socket: Socket = { data: options.data(), send: (message) => Effect.tryPromise({ try: () => { const bytes = Buffer.byteLength(message) if (bytes > maxOutboundBytes || pendingBytes + bytes > maxOutboundBytes) return Promise.reject(new Error(`Simulation outbound queue exceeds ${maxOutboundBytes} bytes`)) pendingBytes += bytes const current = outbound.then( () => new Promise<void>((resolveSend, rejectSend) => { if (connection.readyState !== websocket.WebSocket.OPEN) { rejectSend(new Error("Simulation control socket is not open")) return } connection.send(message, (cause) => (cause ? rejectSend(cause) : resolveSend())) }), ) outbound = current.catch(() => undefined) return current.finally(() => { pendingBytes -= bytes }) }, catch: (cause) => (cause instanceof Error ? cause : new Error(String(cause))), }).pipe( Effect.tapError(() => Effect.sync(() => { connection.terminate() }), ), Effect.orDie, ), } const close = () => { socket.data.closed = true cleanup ??= runPromise(options.close?.(socket) ?? Effect.void).finally(() => sockets.delete(connection)) return cleanup } sockets.set(connection, { socket, cleanup: close }) connection.on("close", () => void close()) connection.on("error", (cause) => { report("socket", cause) connection.terminate() }) connection.on("message", (message) => { const input = Array.isArray(message) ? Buffer.concat(message).toString() : message instanceof ArrayBuffer ? Buffer.from(message).toString() : message.toString() if (Queue.offerUnsafe(messages, { socket, input })) return void runPromise( socket .send( JSON.stringify( SimulationProtocol.JsonRpc.failure(undefined, new Error("Simulation control queue is full")), ), ) .pipe( Effect.catchCause((cause) => Effect.logWarning(`${options.label}: queue rejection failed`, cause), ), ), ) }) }) }), ), ({ close }) => Effect.promise(close), ) return { url: options.endpoint } satisfies Server })}
function send(socket: Socket, response: SimulationProtocol.JsonRpc.Response | undefined) { if (!response) return Effect.void return socket.send(JSON.stringify(response))}
export * as SimulationControlServer from "./control-server"