Client error: Connection terminated unexpectedly when server stops in the middle of running queries

Hello,

I’m using a connection pool. My program gets a client from the pool and releases it after the query.

   const client = await this.getClient();
   await client.query(statement);
   client.release();

I’m listening to all pool and client events. When my server stops the clients start to emit the following error event:

    Connection terminated unexpectedly
       at Connection.<anonymous> (/project/node_modules/pg/lib/client.js:272:71)
       at Object.onceWrapper (events.js:420:28)
       at Connection.emit (events.js:314:20)
       at Socket.<anonymous> (/project/node_modules/pg/lib/connection.js:102:10)
       at Socket.emit (events.js:326:22)
       at endReadableNT (_stream_readable.js:1226:12)
       at processTicksAndRejections (internal/process/task_queues.js:80:21)

The problem is, eventually I get an Unhandled ‘error’ event from clients. I already tried to use client.release(true) to destroy all the clients that emit an error event, tried to use pool.end() after a client sends an error event but nothing seems to work.

The only thing that works for me is calling client.release(true) after client.query(statement) every time even when there is no error, but there is no point in using a pool if I’m always destroying connections.

I’m using node-postgres 8.2.1.

Thanks in advance

[charmander]

You still need the listener on the pool as well. Wherever you’re creating the pool,

pool.on('error', error => {
    console.error('idle client error:', error);
});

Also, off needs to be used with the original function passed to on, not just one with the same effect.

[rols2015]

please check: https://github.com/brianc/node-postgres/issues/2439#issuecomment-757691278