1 files changed, 475 insertions, 0 deletions
diff --git a/node_modules/discord.js/src/sharding/Shard.js b/node_modules/discord.js/src/sharding/Shard.js
new file mode 100644
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--- /dev/null
+++ b/node_modules/discord.js/src/sharding/Shard.js
@@ -0,0 +1,475 @@
+'use strict';
+
+const EventEmitter = require('node:events');
+const path = require('node:path');
+const process = require('node:process');
+const { setTimeout, clearTimeout } = require('node:timers');
+const { setTimeout: sleep } = require('node:timers/promises');
+const { DiscordjsError, ErrorCodes } = require('../errors');
+const ShardEvents = require('../util/ShardEvents');
+const { makeError, makePlainError } = require('../util/Util');
+let childProcess = null;
+let Worker = null;
+
+/**
+ * A self-contained shard created by the {@link ShardingManager}. Each one has a {@link ChildProcess} that contains
+ * an instance of the bot and its {@link Client}. When its child process/worker exits for any reason, the shard will
+ * spawn a new one to replace it as necessary.
+ * @extends {EventEmitter}
+ */
+class Shard extends EventEmitter {
+  constructor(manager, id) {
+    super();
+
+    switch (manager.mode) {
+      case 'process':
+        childProcess = require('node:child_process');
+        break;
+      case 'worker':
+        Worker = require('node:worker_threads').Worker;
+        break;
+    }
+
+    /**
+     * Manager that created the shard
+     * @type {ShardingManager}
+     */
+    this.manager = manager;
+
+    /**
+     * The shard's id in the manager
+     * @type {number}
+     */
+    this.id = id;
+
+    /**
+     * Whether to pass silent flag to the shard's process (only when {@link ShardingManager#mode} is `process`)
+     * @type {boolean}
+     */
+    this.silent = manager.silent;
+
+    /**
+     * Arguments for the shard's process (only when {@link ShardingManager#mode} is `process`)
+     * @type {string[]}
+     */
+    this.args = manager.shardArgs ?? [];
+
+    /**
+     * Arguments for the shard's process executable (only when {@link ShardingManager#mode} is `process`)
+     * @type {string[]}
+     */
+    this.execArgv = manager.execArgv;
+
+    /**
+     * Environment variables for the shard's process, or workerData for the shard's worker
+     * @type {Object}
+     */
+    this.env = Object.assign({}, process.env, {
+      SHARDING_MANAGER: true,
+      SHARDS: this.id,
+      SHARD_COUNT: this.manager.totalShards,
+      DISCORD_TOKEN: this.manager.token,
+    });
+
+    /**
+     * Whether the shard's {@link Client} is ready
+     * @type {boolean}
+     */
+    this.ready = false;
+
+    /**
+     * Process of the shard (if {@link ShardingManager#mode} is `process`)
+     * @type {?ChildProcess}
+     */
+    this.process = null;
+
+    /**
+     * Worker of the shard (if {@link ShardingManager#mode} is `worker`)
+     * @type {?Worker}
+     */
+    this.worker = null;
+
+    /**
+     * Ongoing promises for calls to {@link Shard#eval}, mapped by the `script` they were called with
+     * @type {Map<string, Promise>}
+     * @private
+     */
+    this._evals = new Map();
+
+    /**
+     * Ongoing promises for calls to {@link Shard#fetchClientValue}, mapped by the `prop` they were called with
+     * @type {Map<string, Promise>}
+     * @private
+     */
+    this._fetches = new Map();
+
+    /**
+     * Listener function for the {@link ChildProcess}' `exit` event
+     * @type {Function}
+     * @private
+     */
+    this._exitListener = null;
+  }
+
+  /**
+   * Forks a child process or creates a worker thread for the shard.
+   * <warn>You should not need to call this manually.</warn>
+   * @param {number} [timeout=30000] The amount in milliseconds to wait until the {@link Client} has become ready
+   * before resolving (`-1` or `Infinity` for no wait)
+   * @returns {Promise<ChildProcess>}
+   */
+  spawn(timeout = 30_000) {
+    if (this.process) throw new DiscordjsError(ErrorCodes.ShardingProcessExists, this.id);
+    if (this.worker) throw new DiscordjsError(ErrorCodes.ShardingWorkerExists, this.id);
+
+    this._exitListener = this._handleExit.bind(this, undefined, timeout);
+
+    switch (this.manager.mode) {
+      case 'process':
+        this.process = childProcess
+          .fork(path.resolve(this.manager.file), this.args, {
+            env: this.env,
+            execArgv: this.execArgv,
+            silent: this.silent,
+          })
+          .on('message', this._handleMessage.bind(this))
+          .on('exit', this._exitListener);
+        break;
+      case 'worker':
+        this.worker = new Worker(path.resolve(this.manager.file), { workerData: this.env })
+          .on('message', this._handleMessage.bind(this))
+          .on('exit', this._exitListener);
+        break;
+    }
+
+    this._evals.clear();
+    this._fetches.clear();
+
+    const child = this.process ?? this.worker;
+
+    /**
+     * Emitted upon the creation of the shard's child process/worker.
+     * @event Shard#spawn
+     * @param {ChildProcess|Worker} process Child process/worker that was created
+     */
+    this.emit(ShardEvents.Spawn, child);
+
+    if (timeout === -1 || timeout === Infinity) return Promise.resolve(child);
+    return new Promise((resolve, reject) => {
+      const cleanup = () => {
+        clearTimeout(spawnTimeoutTimer);
+        this.off('ready', onReady);
+        this.off('disconnect', onDisconnect);
+        this.off('death', onDeath);
+      };
+
+      const onReady = () => {
+        cleanup();
+        resolve(child);
+      };
+
+      const onDisconnect = () => {
+        cleanup();
+        reject(new DiscordjsError(ErrorCodes.ShardingReadyDisconnected, this.id));
+      };
+
+      const onDeath = () => {
+        cleanup();
+        reject(new DiscordjsError(ErrorCodes.ShardingReadyDied, this.id));
+      };
+
+      const onTimeout = () => {
+        cleanup();
+        reject(new DiscordjsError(ErrorCodes.ShardingReadyTimeout, this.id));
+      };
+
+      const spawnTimeoutTimer = setTimeout(onTimeout, timeout);
+      this.once('ready', onReady);
+      this.once('disconnect', onDisconnect);
+      this.once('death', onDeath);
+    });
+  }
+
+  /**
+   * Immediately kills the shard's process/worker and does not restart it.
+   */
+  kill() {
+    if (this.process) {
+      this.process.removeListener('exit', this._exitListener);
+      this.process.kill();
+    } else {
+      this.worker.removeListener('exit', this._exitListener);
+      this.worker.terminate();
+    }
+
+    this._handleExit(false);
+  }
+
+  /**
+   * Options used to respawn a shard.
+   * @typedef {Object} ShardRespawnOptions
+   * @property {number} [delay=500] How long to wait between killing the process/worker and
+   * restarting it (in milliseconds)
+   * @property {number} [timeout=30000] The amount in milliseconds to wait until the {@link Client}
+   * has become ready before resolving (`-1` or `Infinity` for no wait)
+   */
+
+  /**
+   * Kills and restarts the shard's process/worker.
+   * @param {ShardRespawnOptions} [options] Options for respawning the shard
+   * @returns {Promise<ChildProcess>}
+   */
+  async respawn({ delay = 500, timeout = 30_000 } = {}) {
+    this.kill();
+    if (delay > 0) await sleep(delay);
+    return this.spawn(timeout);
+  }
+
+  /**
+   * Sends a message to the shard's process/worker.
+   * @param {*} message Message to send to the shard
+   * @returns {Promise<Shard>}
+   */
+  send(message) {
+    return new Promise((resolve, reject) => {
+      if (this.process) {
+        this.process.send(message, err => {
+          if (err) reject(err);
+          else resolve(this);
+        });
+      } else {
+        this.worker.postMessage(message);
+        resolve(this);
+      }
+    });
+  }
+
+  /**
+   * Fetches a client property value of the shard.
+   * @param {string} prop Name of the client property to get, using periods for nesting
+   * @returns {Promise<*>}
+   * @example
+   * shard.fetchClientValue('guilds.cache.size')
+   *   .then(count => console.log(`${count} guilds in shard ${shard.id}`))
+   *   .catch(console.error);
+   */
+  fetchClientValue(prop) {
+    // Shard is dead (maybe respawning), don't cache anything and error immediately
+    if (!this.process && !this.worker) {
+      return Promise.reject(new DiscordjsError(ErrorCodes.ShardingNoChildExists, this.id));
+    }
+
+    // Cached promise from previous call
+    if (this._fetches.has(prop)) return this._fetches.get(prop);
+
+    const promise = new Promise((resolve, reject) => {
+      const child = this.process ?? this.worker;
+
+      const listener = message => {
+        if (message?._fetchProp !== prop) return;
+        child.removeListener('message', listener);
+        this.decrementMaxListeners(child);
+        this._fetches.delete(prop);
+        if (!message._error) resolve(message._result);
+        else reject(makeError(message._error));
+      };
+
+      this.incrementMaxListeners(child);
+      child.on('message', listener);
+
+      this.send({ _fetchProp: prop }).catch(err => {
+        child.removeListener('message', listener);
+        this.decrementMaxListeners(child);
+        this._fetches.delete(prop);
+        reject(err);
+      });
+    });
+
+    this._fetches.set(prop, promise);
+    return promise;
+  }
+
+  /**
+   * Evaluates a script or function on the shard, in the context of the {@link Client}.
+   * @param {string|Function} script JavaScript to run on the shard
+   * @param {*} [context] The context for the eval
+   * @returns {Promise<*>} Result of the script execution
+   */
+  eval(script, context) {
+    // Stringify the script if it's a Function
+    const _eval = typeof script === 'function' ? `(${script})(this, ${JSON.stringify(context)})` : script;
+
+    // Shard is dead (maybe respawning), don't cache anything and error immediately
+    if (!this.process && !this.worker) {
+      return Promise.reject(new DiscordjsError(ErrorCodes.ShardingNoChildExists, this.id));
+    }
+
+    // Cached promise from previous call
+    if (this._evals.has(_eval)) return this._evals.get(_eval);
+
+    const promise = new Promise((resolve, reject) => {
+      const child = this.process ?? this.worker;
+
+      const listener = message => {
+        if (message?._eval !== _eval) return;
+        child.removeListener('message', listener);
+        this.decrementMaxListeners(child);
+        this._evals.delete(_eval);
+        if (!message._error) resolve(message._result);
+        else reject(makeError(message._error));
+      };
+
+      this.incrementMaxListeners(child);
+      child.on('message', listener);
+
+      this.send({ _eval }).catch(err => {
+        child.removeListener('message', listener);
+        this.decrementMaxListeners(child);
+        this._evals.delete(_eval);
+        reject(err);
+      });
+    });
+
+    this._evals.set(_eval, promise);
+    return promise;
+  }
+
+  /**
+   * Handles a message received from the child process/worker.
+   * @param {*} message Message received
+   * @private
+   */
+  _handleMessage(message) {
+    if (message) {
+      // Shard is ready
+      if (message._ready) {
+        this.ready = true;
+        /**
+         * Emitted upon the shard's {@link Client#event:shardReady} event.
+         * @event Shard#ready
+         */
+        this.emit(ShardEvents.Ready);
+        return;
+      }
+
+      // Shard has disconnected
+      if (message._disconnect) {
+        this.ready = false;
+        /**
+         * Emitted upon the shard's {@link Client#event:shardDisconnect} event.
+         * @event Shard#disconnect
+         */
+        this.emit(ShardEvents.Disconnect);
+        return;
+      }
+
+      // Shard is attempting to reconnect
+      if (message._reconnecting) {
+        this.ready = false;
+        /**
+         * Emitted upon the shard's {@link Client#event:shardReconnecting} event.
+         * @event Shard#reconnecting
+         */
+        this.emit(ShardEvents.Reconnecting);
+        return;
+      }
+
+      // Shard has resumed
+      if (message._resume) {
+        this.ready = true;
+        /**
+         * Emitted upon the shard's {@link Client#event:shardResume} event.
+         * @event Shard#resume
+         */
+        this.emit(ShardEvents.Resume);
+        return;
+      }
+
+      // Shard is requesting a property fetch
+      if (message._sFetchProp) {
+        const resp = { _sFetchProp: message._sFetchProp, _sFetchPropShard: message._sFetchPropShard };
+        this.manager.fetchClientValues(message._sFetchProp, message._sFetchPropShard).then(
+          results => this.send({ ...resp, _result: results }),
+          err => this.send({ ...resp, _error: makePlainError(err) }),
+        );
+        return;
+      }
+
+      // Shard is requesting an eval broadcast
+      if (message._sEval) {
+        const resp = { _sEval: message._sEval, _sEvalShard: message._sEvalShard };
+        this.manager._performOnShards('eval', [message._sEval], message._sEvalShard).then(
+          results => this.send({ ...resp, _result: results }),
+          err => this.send({ ...resp, _error: makePlainError(err) }),
+        );
+        return;
+      }
+
+      // Shard is requesting a respawn of all shards
+      if (message._sRespawnAll) {
+        const { shardDelay, respawnDelay, timeout } = message._sRespawnAll;
+        this.manager.respawnAll({ shardDelay, respawnDelay, timeout }).catch(() => {
+          // Do nothing
+        });
+        return;
+      }
+    }
+
+    /**
+     * Emitted upon receiving a message from the child process/worker.
+     * @event Shard#message
+     * @param {*} message Message that was received
+     */
+    this.emit(ShardEvents.Message, message);
+  }
+
+  /**
+   * Handles the shard's process/worker exiting.
+   * @param {boolean} [respawn=this.manager.respawn] Whether to spawn the shard again
+   * @param {number} [timeout] The amount in milliseconds to wait until the {@link Client}
+   * has become ready (`-1` or `Infinity` for no wait)
+   * @private
+   */
+  _handleExit(respawn = this.manager.respawn, timeout) {
+    /**
+     * Emitted upon the shard's child process/worker exiting.
+     * @event Shard#death
+     * @param {ChildProcess|Worker} process Child process/worker that exited
+     */
+    this.emit(ShardEvents.Death, this.process ?? this.worker);
+
+    this.ready = false;
+    this.process = null;
+    this.worker = null;
+    this._evals.clear();
+    this._fetches.clear();
+
+    if (respawn) this.spawn(timeout).catch(err => this.emit(ShardEvents.Error, err));
+  }
+
+  /**
+   * Increments max listeners by one for a given emitter, if they are not zero.
+   * @param {EventEmitter|process} emitter The emitter that emits the events.
+   * @private
+   */
+  incrementMaxListeners(emitter) {
+    const maxListeners = emitter.getMaxListeners();
+    if (maxListeners !== 0) {
+      emitter.setMaxListeners(maxListeners + 1);
+    }
+  }
+
+  /**
+   * Decrements max listeners by one for a given emitter, if they are not zero.
+   * @param {EventEmitter|process} emitter The emitter that emits the events.
+   * @private
+   */
+  decrementMaxListeners(emitter) {
+    const maxListeners = emitter.getMaxListeners();
+    if (maxListeners !== 0) {
+      emitter.setMaxListeners(maxListeners - 1);
+    }
+  }
+}
+
+module.exports = Shard;