fix: websocket not receiving messages after some time

[vitorhugods]

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PR Submission Checklist for internal contributors

• The PR Title

  • conforms to the style of semantic commits messages¹ supported in Wire's Github Workflow²
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What's new in this PR?

Issues

After some time, the websocket dies. It completely stops receiving messages without any sings of errors, exceptions, or anything else being called.

Causes

As we do not send messages to the backend, it seems that the backend expects at least some pings every so often to keep the connection alive.
After some time without receiving anything, the backend just leaves the connection in a limbo and doesn't send any more messages through it.

Solutions

Add a ping every so many seconds.
It seems that @makingthematrix also went through this problem back in 2019 for the Scala app (see this commit), and 30s has been the magic number that carried the Scala app until now.

Unfortunately OkHttp doesn't handle dynamic pinging, so it must be configured directly into the HttpEngine, and it seems that the configuration in WebSockets is just ignored if you're using OkHttp.

So, even though adding it to OkHttp fixes it for Android and JVM, I've added it to Ktor as well so it also works for other platforms.

Note: During my investigation I also added a lower-level logging to the WebSocket and I guess there's no harm keeping it.

Testing

Manually tested as we can't yet mock WebSockets using Ktor.

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PR Post Merge Checklist for internal contributors

• If any soft of configuration variable was introduced by this PR, it has been added to the relevant documents and the CI jobs have been updated.

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References

1. https://sparkbox.com/foundry/semantic_commit_messages
2. https://github.com/wireapp/.github#usage
3. E.g. feat(conversation-list): Sort conversations by most emojis in the title #SQPIT-764.

[github-actions]

Unit Test Results

   175 files   -   17     175 suites   - 17   24s ⏱️ +3s
   788 tests  - 134     780 ✔️  - 135  8 💤 +1  0 ❌ ±0 
1 478 runs  +556  1 469 ✔️ +554  9 💤 +2  0 ❌ ±0 

Results for commit 0401355. ± Comparison against base commit 212198a.

♻️ This comment has been updated with latest results.

[codecov-commenter]

Codecov Report

Merging #791 (0401355) into develop (212198a) will decrease coverage by 0.14%.
The diff coverage is 6.06%.

@@              Coverage Diff              @@
##             develop     #791      +/-   ##
=============================================
- Coverage      58.44%   58.29%   -0.15%     
  Complexity       666      666              
=============================================
  Files            431      432       +1     
  Lines          11138    11170      +32     
  Branches        1122     1122              
=============================================
+ Hits            6510     6512       +2     
- Misses          4150     4180      +30     
  Partials         478      478              

[vitorhugods]

Labeler is currently broken: srvaroa/labeler#43.

Seems to be caused by: niemeyer/gopkg#63

[ohassine]

Bravo! Nice catch 👌

[MohamadJaara]

LGTM 🚀