Logging - unique request ID to each log line wherever the line is logged

[tiblu]

Overview

To ease debugging an unique ID should be added to each line logged in the request context no matter how deep in the stack.

The problem is that Node.JS being async, it is quite a difficult to carry on the id between context switches. It does not make sense to pass req object or the id to each function call either.

Possible solutions

• https://nodejs.org/api/async_hooks.html

Outdated:

• https://datahero.com/blog/2014/05/22/node-js-preserving-data-across-async-callbacks/
• http://nodejs.org/docs/v0.11.11/api/process.html#process_async_listeners

TODO

• Each log line to contain unique request ID
• Same unique request ID should be visible in the HTTP response headers

[ilmartyrk]

Needs further investigation, but I see the problem

[anettlinno]

Triage 37. Still relevant issue, but not with high priority. Needs investigation though, to check if it´s not outdated. Approx. investigation + dev. time 1 day. sending to To do.