Feature/craig/map auction variant

[CDRussell]

Task/Issue URL:

• https://app.asana.com/0/1134083878772872/1160666959362066
• https://app.asana.com/0/inbox/608920331025313/1161150028836612/1160844869366003

Tech Design URL:
CC:

Description:
Captures the eu auction referrer data and maps to a static variant ml if found

Steps to test this PR:

Need to use Play Store ad-hoc app sharing for this. You can either upload your own APK and build your custom URLs to test, or here's some I made earlier! 😃

Device setup

1. configure logcat to display regex refer|var
2. Charles interception will be required too.

Scenarios

For each of the scenarios below:

1. uninstall the app first.
2. click on the link using your device which launch the ad-hoc Play Store installation screen
3. install and launch the app
4. verify if correct referrer identified

No referrer data at all

• https://play.google.com/apps/test/RQl8L2Oq05Y/ahAAvZMmgU1UTzrqZSY6imvdf6Lt0YRNKYXlHLncb943FFynluPOtfshW9hb7RyIj5Kjy5XMxe9wJCozok-mzan7VZ
• verify neither campaign referrer nor EU auction referrer identified
• verify variant allocation happens normally
• verify /exti call has correct variant
• perform a search; verify t=ddg_android is added to URL (as normal)

Campaign referrer

• https://play.google.com/apps/test/RQl8L2Oq05Y/ahAAvZMmgU1UTzrqZSY6imvdf6Lt0YRNKYXlHLncb943FFynluPOtfshW9hb7RyIj5Kjy5XMxe9wJCozok-mzan7VZ?&referrer=utm_source%3Dgoogle%26utm_medium%3Dcpc%26anid%3Dadmob%26utm_campaign%3DDDGRAXX
• verify campaign referrer XX found (logcat: Updating variant for app referer: XX)
• verify /exti call uses XX
• perform a search; verify t=ddg_android is added to URL (as normal)

EU auction referrer

• https://play.google.com/apps/test/RQl8L2Oq05Y/ahAAvZMmgU1UTzrqZSY6imvdf6Lt0YRNKYXlHLncb943FFynluPOtfshW9hb7RyIj5Kjy5XMxe9wJCozok-mzan7VZ?&referrer=utm_source%3Deea-search-choice%26utm_medium%3Dcpc%26anid%3Dadmob%26utm_campaign%3DFOO
• verify eu auction referrer found (logcat: Updating variant for app referer: ml)
• verify /exti call uses ml
• perform a search; verify t=ddg_androideu is added to URL (instead of normal t=ddg_android)

Both EU auction referrer and Campaign referrer (shouldn't happen, but if it does, EU auction takes precedence)

• https://play.google.com/apps/test/RQl8L2Oq05Y/ahAAvZMmgU1UTzrqZSY6imvdf6Lt0YRNKYXlHLncb943FFynluPOtfshW9hb7RyIj5Kjy5XMxe9wJCozok-mzan7VZ?&referrer=utm_source%3Deea-search-choice%26utm_medium%3Dcpc%26anid%3Dadmob%26utm_campaign%3DDDGRAXX
• verify eu auction referrer found (logcat: Updating variant for app referer: ml)
• verify /exti call uses ml
• perform a search; verify t=ddg_androideu is added to URL (instead of normal t=ddg_android)

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Internal references:

Software Engineering Expectations
Technical Design Template

[subsymbolic]

Great work and thanks for providing test builds, made life so much easier. I added one last comment around test names but feel free to merge when you're ready (no rereview needed).

[malmstein]

is it worth adding an else to deal with unexpected referrers?

[CDRussell]

I did wonder about that, too, but decided not to since the else can mean a few different things (no referrer found, there was a problem parsing the referrer etc...) and I can't think of any single thing we'd want to do for each of them