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fix(Shard): eval promise never resolves (#6649)

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D Trombett
2021-09-23 13:48:22 +02:00
committed by GitHub
parent ecd637f7d6
commit 5070d23914
1 changed files with 8 additions and 6 deletions
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14
src/sharding/Shard.js
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@@ -270,33 +270,35 @@ class Shard extends EventEmitter {
* @returns {Promise<*>} Result of the script execution
*/
eval(script) {
// Stringify the script if it's a Function
const _eval = typeof script === 'function' ? `(${script})(this)` : script;
// Shard is dead (maybe respawning), don't cache anything and error immediately
if (!this.process && !this.worker) return Promise.reject(new Error('SHARDING_NO_CHILD_EXISTS', this.id));
// Cached promise from previous call
if (this._evals.has(script)) return this._evals.get(script);
if (this._evals.has(_eval)) return this._evals.get(_eval);
const promise = new Promise((resolve, reject) => {
const child = this.process ?? this.worker;
const listener = message => {
if (message?._eval !== script) return;
if (message?._eval !== _eval) return;
child.removeListener('message', listener);
this._evals.delete(script);
this._evals.delete(_eval);
if (!message._error) resolve(message._result);
else reject(Util.makeError(message._error));
};
child.on('message', listener);
const _eval = typeof script === 'function' ? `(${script})(this)` : script;
this.send({ _eval }).catch(err => {
child.removeListener('message', listener);
this._evals.delete(script);
this._evals.delete(_eval);
reject(err);
});
});
this._evals.set(script, promise);
this._evals.set(_eval, promise);
return promise;
}