obecny/knex-test

Installation

You need the docker and rest should be automatic.

1. Prepare docker containers

npm run docker:start

2. Install all dependencies and make necessary migrations to newly created docker with postgresql

npm i

3. Run the application

npm start

4. Generate some data by opening and refreshing page couple times.
   Open browser at http://localhost:3000/generate
5. Now get some data from db opening browser at http://localhost:3000
6. Open zipkin using browser at http://localhost:9411/ and click on "Run Query"

You will see "KNEX-TEST http get" and "KNEX-TEST pg.query:select" this is wrong - it means that the traces are not connected

You can click on column "START TIME" to sort traces via date and to see the latest as first

You have 2 options to fix it

Option A

1. Edit file tracing.js
2. Uncomment the line 13 so that you can use AsyncLocalStorageContextManager, save
3. Rerurn npm start
4. Open browser at http://localhost:3000
5. Open zipkin using browser at http://localhost:9411/ and click on "Run Query"
6. You will see "KNEX-TEST http get" which has all traces tied together

Option B

1. Undo changes in tracing.js
2. Edit file server.js
3. Comment lines 19-24
4. Uncomment lines 27-33
5. Rerurn npm start
6. Open browser at http://localhost:3000
7. Open zipkin using browser at http://localhost:9411/ and click on "Run Query"
8. You will see "KNEX-TEST http get" which has all traces tied together even though the AsyncLocalStorageContextManager is not used

Expected solution and fix for knex

Fix the knex to correctly handle the context when using async / await, you should probably use
https://nodejs.org/docs/latest-v14.x/api/async_hooks.html#async_hooks_resource