node.js - 如何在 node.js 和 mongoDB native 驱动程序上启用调试？

Question

我使用带有连接池的 node.js 和 node-mongodb-native 驱动程序。有什么方法可以启用调试以查看发生了什么、有多少连接处于事件状态以及连接何时打开或关闭？

我想看到这样的东西:

* connection xxx opened on host:port* connection yyy opened on host:port* connection xxx closed

Answer 1

1. 要查看发送到 MongoDB 的命令，请设置 driver logger's级别为调试。
2. 对connection pool events使用react，只需订阅它们并自己登录即可。
3. 您可能需要 topology monitoring对拓扑的变化使用react，例如连接到辅助 Node 或与副本集断开连接。

const client = new MongoClient('mongodb://127.0.0.1:27017/', {
  useUnifiedTopology: true,
  loggerLevel: 'debug',
  // logger: (message, context) => console.dir(context),
})

// connection pool monitoring
client.on('connectionPoolCreated', event => console.dir(event))
client.on('connectionPoolClosed', event => console.dir(event))
client.on('connectionCreated', event => console.dir(event))
client.on('connectionReady', event => console.dir(event))
client.on('connectionClosed', event => console.dir(event))
client.on('connectionCheckOutStarted', event => console.dir(event))
client.on('connectionCheckOutFailed', event => console.dir(event))
client.on('connectionCheckedOut', event => console.dir(event))
client.on('connectionCheckedIn', event => console.dir(event))
client.on('connectionPoolCleared', event => console.dir(event))

// topology monitoring
client.on('serverDescriptionChanged', event => console.dir(event))
client.on('serverHeartbeatStarted', event => console.dir(event))
client.on('serverHeartbeatSucceeded', event => console.dir(event))
client.on('serverHeartbeatFailed', event => console.dir(event))
client.on('serverOpening', event => console.dir(event))
client.on('serverClosed', event => console.dir(event))
client.on('topologyOpening', event => console.dir(event))
client.on('topologyClosed', event => console.dir(event))
client.on('topologyDescriptionChanged', event => console.dir(event))