[fix:filebeat/input/redis/slowlog] Correctly parse Redis role values in connection receive

[jdheyburn]

• Bug

Redis replication role was added in below PR:

• [filebeat/input/redis/slowlog] Add field for the Redis replication role #40486

However it did not correctly deserialize the response, this PR fixes that.

Proposed commit message

Correctly parse Redis role values in connection receive

Checklist

• My code follows the style guidelines of this project
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have made corresponding change to the default configuration files
• I have added tests that prove my fix is effective or that my feature works
• I have added an entry in CHANGELOG.next.asciidoc or CHANGELOG-developer.next.asciidoc.

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[mergify]

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If this is a bug or security fix, could you label this PR @jdheyburn? 🙏.
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[mergify]

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[belimawr]

@jdheyburn could you add a test to show that this fix works? There is already an integration test on this package (filebeat/input/redis/redis_integration_test.go) that can be a good starting point.

[jdheyburn]

Thanks @belimawr, I am unsure if the integration test is doing much besides seeing if it can establish a connection to Redis. Would it make more sense to enhance the below instead to verify that it is a string being returned?

• beats/filebeat/tests/system/test_redis.py

  Line 50 in 4244fa2

  assert "redis.slowlog.role" in output

[belimawr]

Thanks @belimawr, I am unsure if the integration test is doing much besides seeing if it can establish a connection to Redis. Would it make more sense to enhance the below instead to verify that it is a string being returned?

• beats/filebeat/tests/system/test_redis.py

  Line 50 in 4244fa2

  assert "redis.slowlog.role" in output

That does make sense, however, we are trying to move away from those python tests and migrate them to Go. Currently we're doing our bests not to write new python tests (or add functionalities to them).

If you could add this validation to the Go test filebeat/input/redis/redis_integration_test.go it would be much better.

[jdheyburn]

@belimawr I appreciate the path going forward is to use the Go integration tests, but I believe this increases the scope of the PR which is a bug fix. For this iteration could we continue to use the Python test and any net new functionality gets added as a Go integration test?