Question

我在节点上使用bluebird承诺和Sequelize（内部也使用蓝鸟）。

刚开始我这样做：

// only use one Promise library for the entire application
GLOBAL.Promise = Sequelize.Promise || require('bluebird');
// setup long stack traces
GLOBAL.Promise.longStackTraces();

大多数时候，我得到很好的堆栈跟踪。但有时当我从Sequelize的底层MySQL实现中得到一个错误时，stacktraces会出错，就像这样：

SequelizeUniqueConstraintError
    at module.exports.Query.formatError (D:\code\theapp\node_modules\sequelize\lib\dialects\mysql\query.js:109:16)
    at Query._callback (D:\code\theapp\node_modules\sequelize\lib\dialects\mysql\query.js:38:23)
    at Query.Sequence.end (D:\code\theapp\node_modules\mysql\lib\protocol\sequences\Sequence.js:96:24)
    at Query.ErrorPacket (D:\code\theapp\node_modules\mysql\lib\protocol\sequences\Query.js:93:8)
    at Protocol._parsePacket (D:\code\theapp\node_modules\mysql\lib\protocol\Protocol.js:271:23)
    at Parser.write (D:\code\theapp\node_modules\mysql\lib\protocol\Parser.js:77:12)
    at Protocol.write (D:\code\theapp\node_modules\mysql\lib\protocol\Protocol.js:39:16)
    at Socket.<anonymous    (D:\code\theapp\node_modules\mysql\lib\Connection.js:82:28)
    at Socket.emit (events.js:95:17)
    at Socket.<anonymous    (_stream_readable.js:764:14)
    at Socket.emit (events.js:92:17)
    at emitReadable_ (_stream_readable.js:426:10)
    at emitReadable (_stream_readable.js:422:5)
    at readableAddChunk (_stream_readable.js:165:9) 
From previous event:
From previous event:
From previous event:
From previous event:
From previous event:
From previous event:
From previous event:
From previous event:
From previous event:
From previous event:
From previous event:
From previous event:
From previous event: (D:/code/theapp/components/util/Log.js:116)

我在Windows 7上运行Node v0.10.33。

这是一个错误吗？如果是这样，我应该使用哪个库（或使用Node？）？

Answer 1

我做了一些挖掘，发现这个特殊的错误是一个自定义的Sequelize错误，在它的构造函数中，调用了更多自定义错误构造函数，一直到链Error.apply(this, arguments)。此错误还包装原始错误。如果不是包装器，我获取本机错误（不是通过Error.apply创建的），即使我只读过一次（如var smth = err.theWrappedError && err.theWrappedError.something;），也会出现正确的堆栈跟踪。所以我认为，这和以前的堆栈跟踪之谜一样，可能是V8错误。

作为参考，此代码导致上面的错误堆栈跟踪：

if (!message) {
    message = 'exception';
}
console.error(message = this.Tools.formatUserMessage((message && (message + ' - ') || '')));
console.error(err.stack);

此代码显示更多信息和正确的堆栈跟踪：

var parent = err.parent;    // access the underlying error here
var sql = (parent && parent.sql) || err.sql;
var sqlMessage = sql && 'SQL error `' + sql + ']';
if (!message) {
    if (sql) {
        message = sqlMessage;
    }
    else {
        message = 'exception';
    }
}
else {
    message += ' - ' + sqlMessage;
}
console.error(message = this.Tools.formatUserMessage((message && (message + ' - ') || '')));
console.error(err.stack);
parent && parent.stack && console.error(parent.stack);

两件事：

最后，你可能想让它完全递归并且只要有另一个parent就继续上升，即使我还没有看到超过两个的错误链。
即使err.stack显示正确的错误跟踪，也不会显示整个事情。

来自第二个代码段的示例堆栈跟踪：

[2015-01-30 17:09:13.235] [ERROR] default - [asd] SQL error (`INSERT INTO `theApp_user` (`uid`,`role`,`displayRole`,`name`,`locale`,`createdAt`,`updatedAt`) VALUES (DEFAULT,4,4,'asd','en','20109:13','2015-01-30 09:09:13');`) -  (D:/code/theApp/components/util/Log.js:126)

[2015-01-30 17:09:13.237] [ERROR] default - SequelizeUniqueConstraintError
    at module.exports.Query.formatError (D:\code\theApp\node_modules\sequelize\lib\dialects\mysql\query.js:109:16)
    at Query._callback (D:\code\theApp\node_modules\sequelize\lib\dialects\mysql\query.js:38:23)
    at Query.Sequence.end (D:\code\theApp\node_modules\mysql\lib\protocol\sequences\Sequence.js:96:24)
    at Query.ErrorPacket (D:\code\theApp\node_modules\mysql\lib\protocol\sequences\Query.js:93:8)
    at Protocol._parsePacket (D:\code\theApp\node_modules\mysql\lib\protocol\Protocol.js:271:23)
    at Parser.write (D:\code\theApp\node_modules\mysql\lib\protocol\Parser.js:77:12)
    at Protocol.write (D:\code\theApp\node_modules\mysql\lib\protocol\Protocol.js:39:16)
    at Socket.<anonymous> (D:\code\theApp\node_modules\mysql\lib\Connection.js:82:28)
    at Socket.emit (events.js:95:17)
    at Socket.<anonymous> (_stream_readable.js:764:14)
    at Socket.emit (events.js:92:17)
    at emitReadable_ (_stream_readable.js:426:10)
    at emitReadable (_stream_readable.js:422:5)
    at readableAddChunk (_stream_readable.js:165:9)
From previous event:
    at new Promise (D:\code\theApp\node_modules\sequelize\node_modules\bluebird\js\main\promise.js:84:37)
    at new SequelizePromise (D:\code\theApp\node_modules\sequelize\lib\promise.js:28:17)
    at module.exports.Query.run (D:\code\theApp\node_modules\sequelize\lib\dialects\mysql\query.js:31:19)
    at D:\code\theApp\node_modules\sequelize\lib\sequelize.js:613:20
    at Promise._settlePromiseAt (D:\code\theApp\node_modules\sequelize\lib\promise.js:66:18)
    at process._tickDomainCallback (node.js:463:13)
From previous event:
    at new Promise (D:\code\theApp\node_modules\sequelize\node_modules\bluebird\js\main\promise.js:84:37)
    at new SequelizePromise (D:\code\theApp\node_modules\sequelize\lib\promise.js:28:17)
    at ConnectionManager.getConnection (D:\code\theApp\node_modules\sequelize\lib\dialects\abstract\connection-manager.js:186:10)
    at module.exports.Sequelize.query (D:\code\theApp\node_modules\sequelize\lib\sequelize.js:610:85)
    at module.exports.QueryInterface.insert (D:\code\theApp\node_modules\sequelize\lib\query-interface.js:451:27)
    at D:\code\theApp\node_modules\sequelize\lib\instance.js:601:43
From previous event:
    at D:\code\theApp\node_modules\sequelize\lib\instance.js:578:25
    at Promise._settlePromiseAt (D:\code\theApp\node_modules\sequelize\lib\promise.js:66:18)
    at process._tickDomainCallback (node.js:463:13)
From previous event:
    at module.exports.Instance.save (D:\code\theApp\node_modules\sequelize\lib\instance.js:500:23)
    at module.exports.Model.create (D:\code\theApp\node_modules\sequelize\lib\model.js:1051:8)
    at Object.Private.createAndLogin (D:\code\theApp\components\models\core\User.js:339:38)
    at Object.<anonymous> (D:\code\theApp\components\debug\CourseSimulator.js:440:55)
From previous event:
    at Object.<anonymous> (D:\code\theApp\components\debug\CourseSimulator.js:415:47)
    at Promise._settlePromiseAt (D:\code\theApp\node_modules\sequelize\lib\promise.js:66:18)
From previous event:
    at Promise$bind [as bind] (D:\code\theApp\node_modules\sequelize\node_modules\bluebird\js\main\promise.js:104:9)
    at Object.Public.reset (D:\code\theApp\components\debug\CourseSimulator.js:390:22)
    at D:\code\theApp\node_modules\nogap\lib\CommandProxy.js:129:74
    at tryCatcher (D:\code\theApp\node_modules\nogap\assets\bluebird.js:4408:31)
    at Promise._settlePromiseFromHandler (D:\code\theApp\node_modules\nogap\assets\bluebird.js:2342:31)
    at Promise._settlePromiseAt (D:\code\theApp\node_modules\nogap\assets\bluebird.js:2504:18)
    at Promise._settlePromiseAtPostResolution (D:\code\theApp\node_modules\nogap\assets\bluebird.js:2070:10)
    at Async._drainQueue (D:\code\theApp\node_modules\nogap\assets\bluebird.js:152:12)
    at Async._drainQueues (D:\code\theApp\node_modules\nogap\assets\bluebird.js:157:10)
    at Async.drainQueues (D:\code\theApp\node_modules\nogap\assets\bluebird.js:82:14)
    at process._tickDomainCallback (node.js:463:13)
From previous event:
    at new Promise (D:\code\theApp\node_modules\sequelize\node_modules\bluebird\js\main\promise.js:84:37)
    at new SequelizePromise (D:\code\theApp\node_modules\sequelize\lib\promise.js:28:17)
    at ConnectionManager.releaseConnection (D:\code\theApp\node_modules\sequelize\lib\dialects\abstract\connection-manager.js:196:10)
    at D:\code\theApp\node_modules\sequelize\lib\sequelize.js:615:39
    at Object.finallyHandler (D:\code\theApp\node_modules\sequelize\node_modules\bluebird\js\main\finally.js:64:23)
From previous event:
    at new Promise (D:\code\theApp\node_modules\sequelize\node_modules\bluebird\js\main\promise.js:84:37)
    at new SequelizePromise (D:\code\theApp\node_modules\sequelize\lib\promise.js:28:17)
    at module.exports.Query.run (D:\code\theApp\node_modules\sequelize\lib\dialects\mysql\query.js:31:19)
    at D:\code\theApp\node_modules\sequelize\lib\sequelize.js:613:20
    at Promise._settlePromiseAt (D:\code\theApp\node_modules\sequelize\lib\promise.js:66:18)
    at process._tickDomainCallback (node.js:463:13)
From previous event:
    at new Promise (D:\code\theApp\node_modules\sequelize\node_modules\bluebird\js\main\promise.js:84:37)
    at new SequelizePromise (D:\code\theApp\node_modules\sequelize\lib\promise.js:28:17)
    at ConnectionManager.getConnection (D:\code\theApp\node_modules\sequelize\lib\dialects\abstract\connection-manager.js:186:10)
    at module.exports.Sequelize.query (D:\code\theApp\node_modules\sequelize\lib\sequelize.js:610:85)
    at module.exports.QueryInterface.insert (D:\code\theApp\node_modules\sequelize\lib\query-interface.js:451:27)
    at D:\code\theApp\node_modules\sequelize\lib\instance.js:601:43
From previous event:
    at D:\code\theApp\node_modules\sequelize\lib\instance.js:578:25
    at Promise._settlePromiseAt (D:\code\theApp\node_modules\sequelize\lib\promise.js:66:18)
    at process._tickDomainCallback (node.js:463:13)
From previous event:
    at module.exports.Instance.save (D:\code\theApp\node_modules\sequelize\lib\instance.js:500:23)
    at module.exports.Model.create (D:\code\theApp\node_modules\sequelize\lib\model.js:1051:8)
    at Object.Private.createAndLogin (D:\code\theApp\components\models\core\User.js:339:38)
    at Object.<anonymous> (D:\code\theApp\components\debug\CourseSimulator.js:440:55)
From previous event:
    at Object.<anonymous> (D:\code\theApp\components\debug\CourseSimulator.js:415:47)
    at Promise._settlePromiseAt (D:\code\theApp\node_modules\sequelize\lib\promise.js:66:18)
From previous event:
    at Promise$bind [as bind] (D:\code\theApp\node_modules\sequelize\node_modules\bluebird\js\main\promise.js:104:9)
    at Object.Public.reset (D:\code\theApp\components\debug\CourseSimulator.js:390:22)
    at D:\code\theApp\node_modules\nogap\lib\CommandProxy.js:129:74
    at tryCatcher (D:\code\theApp\node_modules\nogap\assets\bluebird.js:4408:31)
    at Promise._settlePromiseFromHandler (D:\code\theApp\node_modules\nogap\assets\bluebird.js:2342:31)
    at Promise._settlePromiseAt (D:\code\theApp\node_modules\nogap\assets\bluebird.js:2504:18)
    at Promise._settlePromiseAtPostResolution (D:\code\theApp\node_modules\nogap\assets\bluebird.js:2070:10)
    at Async._drainQueue (D:\code\theApp\node_modules\nogap\assets\bluebird.js:152:12)
    at Async._drainQueues (D:\code\theApp\node_modules\nogap\assets\bluebird.js:157:10)
    at Async.drainQueues (D:\code\theApp\node_modules\nogap\assets\bluebird.js:82:14)
    at process._tickDomainCallback (node.js:463:13) (D:/code/theApp/components/util/Log.js:127)

[2015-01-30 17:09:13.240] [ERROR] default - Error: ER_DUP_ENTRY: Duplicate entry 'asd' for key 'theApp_user_name'
    at Query.Sequence._packetToError (D:\code\theApp\node_modules\mysql\lib\protocol\sequences\Sequence.js:48:14)
    at Query.ErrorPacket (D:\code\theApp\node_modules\mysql\lib\protocol\sequences\Query.js:82:18)
    at Protocol._parsePacket (D:\code\theApp\node_modules\mysql\lib\protocol\Protocol.js:271:23)
    at Parser.write (D:\code\theApp\node_modules\mysql\lib\protocol\Parser.js:77:12)
    at Protocol.write (D:\code\theApp\node_modules\mysql\lib\protocol\Protocol.js:39:16)
    at Socket.<anonymous> (D:\code\theApp\node_modules\mysql\lib\Connection.js:82:28)
    at Socket.emit (events.js:95:17)
    at Socket.<anonymous> (_stream_readable.js:764:14)
    at Socket.emit (events.js:92:17)
    at emitReadable_ (_stream_readable.js:426:10)
    at emitReadable (_stream_readable.js:422:5)
    at readableAddChunk (_stream_readable.js:165:9)
    at Socket.Readable.push (_stream_readable.js:127:10)
    at TCP.onread (net.js:528:21)
    --------------------
    at Protocol._enqueue (D:\code\theApp\node_modules\mysql\lib\protocol\Protocol.js:135:48)
    at Connection.query (D:\code\theApp\node_modules\mysql\lib\Connection.js:185:25)
    at D:\code\theApp\node_modules\sequelize\lib\dialects\mysql\query.js:32:23
    at sequelizeResolver (D:\code\theApp\node_modules\sequelize\lib\promise.js:32:12)
    at tryCatch2 (D:\code\theApp\node_modules\sequelize\node_modules\bluebird\js\main\util.js:53:21)
    at Promise$_resolveFromResolver [as _resolveFromResolver] (D:\code\theApp\node_modules\sequelize\node_modules\bluebird\js\main\promise.js:618:13)
    at new Promise (D:\code\theApp\node_modules\sequelize\node_modules\bluebird\js\main\promise.js:84:37)
    at new SequelizePromise (D:\code\theApp\node_modules\sequelize\lib\promise.js:28:17)
    at module.exports.Query.run (D:\code\theApp\node_modules\sequelize\lib\dialects\mysql\query.js:31:19)
    at D:\code\theApp\node_modules\sequelize\lib\sequelize.js:613:20
    at tryCatch1 (D:\code\theApp\node_modules\sequelize\node_modules\bluebird\js\main\util.js:45:21)
    at Promise$_callHandler [as _callHandler] (D:\code\theApp\node_modules\sequelize\node_modules\bluebird\js\main\promise.js:660:13)
    at Promise$_settlePromiseFromHandler [as _settlePromiseFromHandler] (D:\code\theApp\node_modules\sequelize\node_modules\bluebird\js\main\promise.js:675:18)
    at Promise$_settlePromiseAt (D:\code\theApp\node_modules\sequelize\node_modules\bluebird\js\main\promise.js:845:14)
    at Promise._settlePromiseAt (D:\code\theApp\node_modules\sequelize\lib\promise.js:66:18) (D:/code/theApp/components/util/Log.js:128)

<强>更新

实际上我发现这项工作有时候，有时它没有，有时它部分工作（显示部分堆栈跟踪）......可能是V8堆栈或堆管理器中的竞争条件......

当使用Sequelize / MySQL时，Bluebird显示损坏的堆栈跟踪

1 个答案: