cancel active query doesn't work with js bindings

Cancelling long running query, doesn’t work with js bindings, though with native bindings it works. Example:

pg = require('pg');

var client = new pg.Client(...);

client.on('notice', function(msg) {
  console.log("custom notice: " + msg);
});

client.connect(function(err){

    if (err){
        console.log(err);
    }

    var query_text = "select pg_sleep(20);";
    var query = client.query(query_text, function(err, result){
        if (err){
            console.log(err);
        }
    });

    console.log("wating for 5 seconds");
    setInterval(function(){
        console.log("canceling query");
        client.cancel(query);
    }, 5000);

});

After issuing cancel the query keeps running, while with native bindings it returns error as expected:

wating for 5 seconds
canceling query
{ [Error: ERROR:  canceling statement due to user request
]
  severity: 'ERROR',
  sqlState: '57014',
  messagePrimary: 'canceling statement due to user request',
  sourceFile: 'postgres.c',
  sourceLine: '3009',
  sourceFunction: 'ProcessInterrupts' }

[vitaly-t]

Does it still doesn’t work? 🎱

[mhkeller]

Looks like #1392 has stalled. Is this on the roadmap? I’m also not sure how you’d implement the above using await via the promises API since your code wouldn’t reach the setTimeout bit. Any thoughts @boromisp?