Can you set a unique id?

[TannerS]

We have a trace id coming from a third party service and would like to use that one, in that request for the logs in our service that calls it. is that possible? here is an example of what we are hoping for

const rTracer = require('cls-rtracer');

const fakeEndpoint = async (req, res) => {
  const traceIdFromThirdParty = req.traceId;

  rTracer.setId(traceIdFromThirdParty);
}

[puzpuzpuz]

Hi. requestIdFactory config param serves exactly this purpose:

const rTracer = require('cls-rtracer');

app.register(rTracer.fastifyPlugin, {
  // This function will be used to initialize the request id at the beginning of each request.
  requestIdFactory: (req) => req.traceId
});

const fakeEndpoint = async (req, res) => {
  console.log('here is my 3rd-party request id: ' + rTracer.id());
};

[TannerS]

hey @puzpuzpuz , dumb question, this is assuming app is the server and your adding it like a middleware? this may not work for us, the server lib we use doesnt allow custom middlewares, is there any other option?

[TannerS]

or do we need the fastify?

[puzpuzpuz]

If you don't have a web server or don't use one of the supported frameworks, you should use AsyncLocalStorage directly instead of cls-rtracer.

[TannerS]

@puzpuzpuz hello, thanks for the reply, and ya we do have a web server but its a custom company made one that doesnt allow injection of middlewares (really stupid i know crys), so inthis example, we would need to set the id on an method (now that i look at it, no request at all object just a normal function) then use that trace id rest of the code base that calls the id function, if that is able to so with AsyncLocalStorage, do you have any examples? thanks !

or is there any possible way to make this lib work?

[puzpuzpuz]

if that is able to so with AsyncLocalStorage, do you have any examples?

That's not cls-rtracer API, so you should refer to the standard library documentation: https://nodejs.org/api/async_context.html#class-asynclocalstorage

[TannerS]

ok ill look, thank you, ill close this but i may have question in future :) thanks!