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import type { Inspector, InspectorEventMap } from ".";
import type { JSC } from "../protocol";
import { EventEmitter } from "node:events";
import { WebSocket } from "ws";
/**
* An inspector that communicates with a debugger over a WebSocket.
*/
export class WebSocketInspector extends EventEmitter<InspectorEventMap> implements Inspector {
#url?: string;
#webSocket?: WebSocket;
#ready: Promise<boolean> | undefined;
#requestId: number;
#pendingRequests: JSC.Request[];
#pendingResponses: Map<number, (result: unknown) => void>;
constructor(url?: string | URL) {
super();
this.#url = url ? String(url) : undefined;
this.#requestId = 1;
this.#pendingRequests = [];
this.#pendingResponses = new Map();
}
get url(): string {
return this.#url!;
}
async start(url?: string | URL): Promise<boolean> {
if (url) {
this.#url = String(url);
}
if (!this.#url) {
this.emit("Inspector.error", new Error("Inspector needs a URL, but none was provided"));
return false;
}
return this.#connect(this.#url);
}
async #connect(url: string): Promise<boolean> {
if (this.#ready) {
return this.#ready;
}
this.close(1001, "Restarting...");
this.emit("Inspector.connecting", url);
let webSocket: WebSocket;
try {
// @ts-expect-error: Support both Bun and Node.js version of `headers`.
webSocket = new WebSocket(url, {
headers: {
"Ref-Event-Loop": "1",
},
finishRequest: (request: import("http").ClientRequest) => {
request.setHeader("Ref-Event-Loop", "1");
request.end();
},
});
} catch (cause) {
this.#close(unknownToError(cause));
return false;
}
webSocket.addEventListener("open", () => {
this.emit("Inspector.connected");
for (const request of this.#pendingRequests) {
if (this.#send(request)) {
this.emit("Inspector.request", request);
}
}
this.#pendingRequests.length = 0;
});
webSocket.addEventListener("message", ({ data }) => {
if (typeof data === "string") {
this.#accept(data);
}
});
webSocket.addEventListener("error", event => {
this.#close(unknownToError(event));
});
webSocket.addEventListener("unexpected-response", () => {
this.#close(new Error("WebSocket upgrade failed"));
});
webSocket.addEventListener("close", ({ code, reason }) => {
if (code === 1001 || code === 1006) {
this.#close();
return;
}
this.#close(new Error(`WebSocket closed: ${code} ${reason}`.trimEnd()));
});
this.#webSocket = webSocket;
const ready = new Promise<boolean>(resolve => {
webSocket.addEventListener("open", () => resolve(true));
webSocket.addEventListener("close", () => resolve(false));
webSocket.addEventListener("error", () => resolve(false));
}).finally(() => {
this.#ready = undefined;
});
this.#ready = ready;
return ready;
}
send<M extends keyof JSC.RequestMap & keyof JSC.ResponseMap>(
method: M,
params?: JSC.RequestMap[M] | undefined,
): Promise<JSC.ResponseMap[M]> {
const id = this.#requestId++;
const request = {
id,
method,
params: params ?? {},
};
return new Promise((resolve, reject) => {
const done = (result: any) => {
this.#pendingResponses.delete(id);
if (result instanceof Error) {
reject(result);
} else {
resolve(result);
}
};
this.#pendingResponses.set(id, done);
if (this.#send(request)) {
this.emit("Inspector.request", request);
} else {
this.emit("Inspector.pendingRequest", request);
}
});
}
#send(request: JSC.Request): boolean {
if (this.#webSocket) {
const { readyState } = this.#webSocket!;
if (readyState === WebSocket.OPEN) {
this.#webSocket.send(JSON.stringify(request));
return true;
}
}
if (!this.#pendingRequests.includes(request)) {
this.#pendingRequests.push(request);
}
return false;
}
#accept(message: string): void {
let data: JSC.Event | JSC.Response;
try {
data = JSON.parse(message);
} catch (cause) {
this.emit("Inspector.error", new Error(`Failed to parse message: ${message}`, { cause }));
return;
}
if (!("id" in data)) {
this.emit("Inspector.event", data);
const { method, params } = data;
this.emit(method, params);
return;
}
this.emit("Inspector.response", data);
const { id } = data;
const resolve = this.#pendingResponses.get(id);
if (!resolve) {
this.emit("Inspector.error", new Error(`Failed to find matching request for ID: ${id}`));
return;
}
this.#pendingResponses.delete(id);
if ("error" in data) {
const { error } = data;
const { message } = error;
resolve(new Error(message));
} else {
const { result } = data;
resolve(result);
}
}
get closed(): boolean {
if (!this.#webSocket) {
return true;
}
const { readyState } = this.#webSocket;
switch (readyState) {
case WebSocket.CLOSED:
case WebSocket.CLOSING:
return true;
}
return false;
}
close(code?: number, reason?: string): void {
this.#webSocket?.close(code ?? 1001, reason);
}
#close(error?: Error): void {
for (const resolve of this.#pendingResponses.values()) {
resolve(error ?? new Error("WebSocket closed"));
}
this.#pendingResponses.clear();
if (error) {
this.emit("Inspector.error", error);
}
this.emit("Inspector.disconnected", error);
}
}
function unknownToError(input: unknown): Error {
if (input instanceof Error) {
return input;
}
if (typeof input === "object" && input !== null && "message" in input) {
const { message } = input;
return new Error(`${message}`);
}
return new Error(`${input}`);
}
|
