Dynamic env vars in yaml file

1

trying to build connection between apps ( totaling one full application ).
Wanting to get a variable from another but with protocol… or trailing slug

- key: MAIN_TEST_HOST_PORT
  fromService:
    type: web
    name: Test 1 - Main API
    property: hostport
- key: MAIN_TEST_PUBLIC_URL
  value: 'http://' + MAIN_TEST_HOST_PORT

or

- key: MAIN_TEST_HOST_PORT
  fromService:
    type: web
    name: Test 1 - Main API 
    property: hostport
- key: MAIN_TEST_PUBLIC_URL
  value: 'http://' + MAIN_TEST_HOST_PORT + '/slughere'

but not able to get the concat to work at all… any help here would be greatly appreciated!

2

Hi there.

Unfortunately our blueprints do not support variable interpolation. One workaround you could try is to do this as part of the startCommand, for example:

startCommand: MAIN_TEST_PUBLIC_URL="http://$MAIN_TEST_HOST_PORT/slughere" node server.js

It might be cleaner to write a Bash script for this, and call it in startCommand.

3

Thank you for your response Hieu:
so, startCommand fires before buildCommand then, correct?
( I ask because there is a difference in the UI - build is first in order on the screen )

4

buildCommand is run first in order to build your service. If you need the interpolation to happen at build time, you can put the snippet MAIN_TEST_PUBLIC_URL="http://$MAIN_TEST_HOST_PORT/slughere" in your buildCommand instead.

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5

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