[英]How to fix 'UnhandledPromiseRejectionWarning' in console
我有一个不和谐机器人,我最近实施了一个货币系统,但是,每次有人说出消息时,我都会在控制台中收到“ UnhandledPromiseRejectionWarning
”警告。
我尝试过使用catch,但这似乎不起作用。
这是完整的错误:
(node:4633) UnhandledPromiseRejectionWarning: SequelizeUniqueConstraintError: Validation error
at Query.formatError (/Users/**censored**/node_modules/sequelize/lib/dialects/sqlite/query.js:413:16)
at Query._handleQueryResponse (/Users/**censored**/node_modules/sequelize/lib/dialects/sqlite/query.js:73:18)
at Statement.afterExecute (/Users/**censored**/node_modules/sequelize/lib/dialects/sqlite/query.js:247:31)
at Statement.replacement (/Users/**censored**/node_modules/sqlite3/lib/trace.js:19:31)
(node:4633) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). (rejection id: 29)
JavaScript代码:
client.once('ready', async() => {
const target = message.mentions.users.first() || message.author;
return message.channel.send(`${target.tag} has ${currency.getBalance(target.id)}💰`);
});
client.on('message', async message => {
if (message.author.bot) return;
currency.add(message.author.id, 1);
if (!message.content.startsWith(PREFIX)) return;
const input = message.content.slice(PREFIX.length).trim();
if (!input.length) return;
const [, command, commandArgs] = input.match(/(\w+)\s*([\s\S]*)/);
if (command === 'balance') {
const target = message.mentions.users.first() || message.author;
return message.channel.send(`${target.tag} has ${currency.getBalance(target.id)}💰`);
} else if (command === 'inventory') {
const target = message.mentions.users.first() || message.author;
const user = await Users.findByPrimary(target.id);
const items = await user.getItems();
if (!items.length) return message.channel.send(`${target.tag} has nothing!`);
return message.channel.send(`${target.tag} currently has ${items.map(i => `${i.amount} ${i.item.name}`).join(', ')}`);
} else if (command === 'transfer') {
const currentAmount = currency.getBalance(message.author.id);
const transferAmount = commandArgs.split(/ +/g).find(arg => !/<@!?\d+>/g.test(arg));
const transferTarget = message.mentions.users.first();
if (!transferAmount || isNaN(transferAmount)) return message.channel.send(`Sorry ${message.author}, that's an invalid amount.`);
if (transferAmount > currentAmount) return message.channel.send(`Sorry ${message.author}, you only have ${currentAmount}.`);
if (transferAmount <= 0) return message.channel.send(`Please enter an amount greater than zero, ${message.author}.`);
currency.add(message.author.id, -transferAmount);
currency.add(transferTarget.id, transferAmount);
return message.channel.send(`Successfully transferred ${transferAmount}💰 to ${transferTarget.tag}. Your current balance is ${currency.getBalance(message.author.id)}💰`);
} else if (command === 'buy') {
const item = await CurrencyShop.findOne({
where: {
name: {
[Op.like]: commandArgs
}
}
});
if (!item) return message.channel.send(`That item doesn't exist.`);
if (item.cost > currency.getBalance(message.author.id)) {
return message.channel.send(`You currently have ${currency.getBalance(message.author.id)}, but the ${item.name} costs ${item.cost}!`);
}
const user = await Users.findByPrimary(message.author.id);
currency.add(message.author.id, -item.cost);
await user.addItem(item);
message.channel.send(`You've bought: ${item.name}.`);
} else if (command === 'shop') {
const items = await CurrencyShop.findAll();
return message.channel.send(items.map(item => `${item.name}: ${item.cost}💰`).join('\n'), {
code: true
});
} else if (command === 'leaderboard') {
return message.channel.send(
currency.sort((a, b) => b.balance - a.balance)
.filter(user => client.users.has(user.user_id))
.first(10)
.map((user, position) => `(${position + 1}) ${(client.users.get(user.user_id).tag)}: ${user.balance}💰`)
.join('\n'), {
code: true
}
);
}
});
我可以看到许多调用send
返回承诺,但不是相关的句柄。
此外,您不能假设client
正确捕获您从处理程序返回的承诺的错误。 client.on
肯定不会期待任何回报。
我建议你将处理程序包装在一个函数中,该函数将执行相应的try catch并且不返回任何内容。
当使用返回promises的方法时,你不能总是假设一切都能完美地运行。 有时,某些事情可能会失败,结果将是一个被拒绝的承诺。 如果未处理,则会发出未处理的unhandledPromiseRejectionWarning
,就像您遇到的那样。
从错误sequelize
查询中的sequelize
内容出错了,特别是验证。
始终确保您正确处理任何拒绝的可能性。 使用try...catch
语句或catch()
方法。
例子:
try {
const items = await CurrencyShop.findAll();
message.channel.send(...);
} catch(err) { // Even if only one promise is rejected,
console.error(err); // the code inside the 'catch' is still
} // executed.
message.channel.send('hi there')
.catch(err => console.error(err));
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