How to handle exception with domain module in restify framework?

[ioubo]

How to get the uncatched exception in restify framework? I try to use server.on('uncaughtException', but it cannot work.

[epappas]

Hi ioubo,

Can you share us a code snippet please?
It works for me, I had run into troubles before thought, as I's causing an exception inside the Handler, so the handler was failing silently.

Cheers.

[ioubo]

The following is my code snippet:

var server = restify.createServer( {
name: 'AppService'
})
server.listen( config.port, config.service_ip, function () {
console.log( '%s listening at %s ', server.name, server.url );
})

var errorhandler = domain.create();
errorhandler.on('error', function (e) {
console.log(e);
});

errorhandler.run(function () {
var appservice = require('./routes/appservice');

server.get({ path: config.prefix_route + '/getClientSetting' }, appservice.getClientSetting);
server.get({ path: config.prefix_route + '/getBatchFutures' }, appservice.getBatchFutures);
server.get({ path: config.prefix_route + '/getFutureTrend' }, appservice.getFutureTrend);
server.get({ path: config.prefix_route + '/getFutureDetail' }, appservice.getFutureDetail);
server.get({ path: config.prefix_route + '/getCandleStick' }, appservice.getCandleStick);

});

[epappas]

If you want to create your own domain, I would suggest wrapping your domain as a middleware, and crete one for each request, just make sure to use it hight enough. But doing that you replicate what restify does already for you.

This is my example of rectify server, handling exceptions:

var server = restify.createServer({
    name: '....',
    log: logger
});

Using the middlewares of your preference:

server.use( ... middleware ... );
server.use( ... middleware ... );
server.use( ... middleware ... );

example of routing

server.get(ROUTE_HERE, controller.getContent);

As an error handler:

server.on('uncaughtException', function (req, res, route, err) {
    // logging here, maybe?
    res.send(err.code || 500, {
        code: err.code || 500,
        error_description: err.status || err.message || err.description || 'Internal Server Error',
        req_body: req.params
    });
});

Finally:

server.on('after', function (req, res, route, err) { ... last logger here, if logger was no set during server creation ... });

[ioubo]

Thanks for your reply. As your way, how to get the stack trace of the error?

[epappas]

If the err is an instance of Error, you can easily log the err.stack.
Otherwise, I don't think you can even print the stack in your custom domains.

console.log(err.stack);

[micahr]

Looks like this issue was answered by epappas. If server.on('uncaughtException') is still not working for you, please open a new ticket with some code examples and the errors that aren't being emitted.