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const {
JSONParse,
JSONStringify,
SafeMap,
Symbol,
} = primordials;
const {
ERR_INSPECTOR_ALREADY_ACTIVATED,
ERR_INSPECTOR_ALREADY_CONNECTED,
ERR_INSPECTOR_CLOSED,
ERR_INSPECTOR_COMMAND,
ERR_INSPECTOR_NOT_AVAILABLE,
ERR_INSPECTOR_NOT_CONNECTED,
ERR_INSPECTOR_NOT_ACTIVE,
ERR_INSPECTOR_NOT_WORKER,
} = require('internal/errors').codes;
const { hasInspector } = internalBinding('config');
if (!hasInspector)
throw new ERR_INSPECTOR_NOT_AVAILABLE();
const EventEmitter = require('events');
const { queueMicrotask } = require('internal/process/task_queues');
const {
validateFunction,
validateObject,
validateString,
} = require('internal/validators');
const { isMainThread } = require('worker_threads');
const {
Connection,
MainThreadConnection,
open,
url,
isEnabled,
waitForDebugger,
console,
} = internalBinding('inspector');
const connectionSymbol = Symbol('connectionProperty');
const messageCallbacksSymbol = Symbol('messageCallbacks');
const nextIdSymbol = Symbol('nextId');
const onMessageSymbol = Symbol('onMessage');
class Session extends EventEmitter {
constructor() {
super();
this[connectionSymbol] = null;
this[nextIdSymbol] = 1;
this[messageCallbacksSymbol] = new SafeMap();
}
/**
* Connects the session to the inspector back-end.
* @returns {void}
*/
connect() {
if (this[connectionSymbol])
throw new ERR_INSPECTOR_ALREADY_CONNECTED('The inspector session');
this[connectionSymbol] =
new Connection((message) => this[onMessageSymbol](message));
}
/**
* Connects the session to the main thread
* inspector back-end.
* @returns {void}
*/
connectToMainThread() {
if (isMainThread)
throw new ERR_INSPECTOR_NOT_WORKER();
if (this[connectionSymbol])
throw new ERR_INSPECTOR_ALREADY_CONNECTED('The inspector session');
this[connectionSymbol] =
new MainThreadConnection(
(message) => queueMicrotask(() => this[onMessageSymbol](message)));
}
[onMessageSymbol](message) {
const parsed = JSONParse(message);
try {
if (parsed.id) {
const callback = this[messageCallbacksSymbol].get(parsed.id);
this[messageCallbacksSymbol].delete(parsed.id);
if (callback) {
if (parsed.error) {
return callback(new ERR_INSPECTOR_COMMAND(parsed.error.code,
parsed.error.message));
}
callback(null, parsed.result);
}
} else {
this.emit(parsed.method, parsed);
this.emit('inspectorNotification', parsed);
}
} catch (error) {
process.emitWarning(error);
}
}
/**
* Posts a message to the inspector back-end.
* @param {string} method
* @param {Record<unknown, unknown>} [params]
* @param {Function} [callback]
* @returns {void}
*/
post(method, params, callback) {
validateString(method, 'method');
if (!callback && typeof params === 'function') {
callback = params;
params = null;
}
if (params) {
validateObject(params, 'params');
}
if (callback) {
validateFunction(callback, 'callback');
}
if (!this[connectionSymbol]) {
throw new ERR_INSPECTOR_NOT_CONNECTED();
}
const id = this[nextIdSymbol]++;
const message = { id, method };
if (params) {
message.params = params;
}
if (callback) {
this[messageCallbacksSymbol].set(id, callback);
}
this[connectionSymbol].dispatch(JSONStringify(message));
}
/**
* Immediately closes the session, all pending
* message callbacks will be called with an
* error.
* @returns {void}
*/
disconnect() {
if (!this[connectionSymbol])
return;
this[connectionSymbol].disconnect();
this[connectionSymbol] = null;
const remainingCallbacks = this[messageCallbacksSymbol].values();
for (const callback of remainingCallbacks) {
process.nextTick(callback, new ERR_INSPECTOR_CLOSED());
}
this[messageCallbacksSymbol].clear();
this[nextIdSymbol] = 1;
}
}
/**
* Activates inspector on host and port.
* @param {number} [port]
* @param {string} [host]
* @param {boolean} [wait]
* @returns {void}
*/
function inspectorOpen(port, host, wait) {
if (isEnabled()) {
throw new ERR_INSPECTOR_ALREADY_ACTIVATED();
}
open(port, host);
if (wait)
waitForDebugger();
}
/**
* Blocks until a client (existing or connected later)
* has sent the `Runtime.runIfWaitingForDebugger`
* command.
* @returns {void}
*/
function inspectorWaitForDebugger() {
if (!waitForDebugger())
throw new ERR_INSPECTOR_NOT_ACTIVE();
}
module.exports = {
open: inspectorOpen,
close: process._debugEnd,
url,
waitForDebugger: inspectorWaitForDebugger,
console,
Session
};
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