这个问题似乎与许多其他问题重复,但我无法在任何地方找到错误。
问题是async.each抛出" Callback已被调用"。这是代码段(我将其命名为异步回调done
,因此它不会与我的代码中的其他回调混淆):
async.each(this.requirements, (requirement, done) => {
// That thing here passes the result as a callback
requirement.callback((result) => {
if (!result) {
// requirement not passed -> return error
done(true); // LINE 42
} else {
done(); // LINE 44
}
}, data, params, bot);
}, (err) => { // 'done' callback
log.info('handler',
`Handler '${this.label}' ${err ? 'failed' : 'succeeded'}`);
// if any requirement did not pass, do not execute handler callback
if (!err) this.callback(data, params, bot);
});
这里是它的堆栈跟踪:
C:\Users\samuel\Code\node\sk22tgjs\node_modules\async\dist\async.js:837
if (fn === null) throw new Error("Callback was already called.");
^
Error: Callback was already called.
at C:\Users\samuel\Code\node\sk22tgjs\node_modules\async\dist\async.js:837:34
at requirement.callback (C:\Users\samuel\Code\node\sk22tgjs\node_modules\telegramjs\core\handler.js:44:11)
at Requirement.exports.command.Requirement.callback (C:\Users\samuel\Code\node\sk22tgjs\node_modules\telegramjs\telegram\requires.js:21:5)
at async.each (C:\Users\samuel\Code\node\sk22tgjs\node_modules\telegramjs\core\handler.js:39:19)
at C:\Users\samuel\Code\node\sk22tgjs\node_modules\async\dist\async.js:2953:18
at replenish (C:\Users\samuel\Code\node\sk22tgjs\node_modules\async\dist\async.js:872:19)
at C:\Users\samuel\Code\node\sk22tgjs\node_modules\async\dist\async.js:878:27
at C:\Users\samuel\Code\node\sk22tgjs\node_modules\async\dist\async.js:840:18
at requirement.callback (C:\Users\samuel\Code\node\sk22tgjs\node_modules\telegramjs\core\handler.js:44:11)
at Requirement.callback (C:\Users\samuel\Code\node\sk22tgjs\node_modules\telegramjs\core\requires.js:19:5)
有趣的是,只有在done(true)
被调用时才会出现问题。然而,错误发生在第44行,而不是42.
您还可以在GitHub上看到损坏的代码,尤其是testing
分支:https://github.com/22sk/telegramjs
提前致谢。
答案 0 :(得分:1)
如果找不到命令,则会调用成功和失败,而不仅仅是失败。
exports.command = new Requirement({
label: 'command',
requires: requires.has('message', 'text'),
callback: (result, data, params, bot) => {
const command = new Command(data.message.text);
if (!command.valid || command.bot && bot.me.username !== command.bot) {
// command is not valid or not meant to be handled by this bot
result(false); // <--- ### Missing return ### --->
}
// command is valid and should be handled by this bot
// write command into data
params.command = command;
result(true);
}
});