Added functionality to allow user to add a message to a topic partition manually

[nguyen-tri-nhan]

Resolve conflict for #230

[Bert-R]

@nguyen-tri-nhan Thanks for this contribution!

I've reviewed it and added a couple of small comments and a question

Besides these, our linter isn't happy, see the below log.

If you resolve these, I would be happy to merge this PR.

2024-12-05 19:29:28 [INFO]   Linting EDITORCONFIG items...
  Error: -05 19:29:29 [ERROR]   Found errors when linting EDITORCONFIG. Exit code: 1.
  2024-12-05 19:29:29 [INFO]   Command output for EDITORCONFIG:
  ------
  src/main/java/kafdrop/util/DefaultMessageSerializer.java:
  	Wrong line endings or no final newline
  	Not all lines have the correct end of line character
  	5: Wrong indent style found (tabs instead of spaces)
  	6: Wrong indent style found (tabs instead of spaces)
  	7: Wrong indent style found (tabs instead of spaces)
  	8: Wrong indent style found (tabs instead of spaces)
  src/main/java/kafdrop/controller/MessageController.java:
  	211: Wrong indent style found (tabs instead of spaces)
  	212: Wrong indent style found (tabs instead of spaces)
  	213: Wrong indent style found (tabs instead of spaces)
  	214: Wrong indent style found (tabs instead of spaces)
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  	216: Wrong indent style found (tabs instead of spaces)
  	217: Wrong indent style found (tabs instead of spaces)
  	218: Wrong indent style found (tabs instead of spaces)
  	219: Wrong indent style found (tabs instead of spaces)
  	[220](https://github.com/obsidiandynamics/kafdrop/actions/runs/12143699503/job/33995776344?pr=703#step:4:222): Wrong indent style found (tabs instead of spaces)
  	221: Wrong indent style found (tabs instead of spaces)
  	222: Wrong indent style found (tabs instead of spaces)
  	[223](https://github.com/obsidiandynamics/kafdrop/actions/runs/12143699503/job/33995776344?pr=703#step:4:225): Wrong indent style found (tabs instead of spaces)
  	224: Wrong indent style found (tabs instead of spaces)
  	[225](https://github.com/obsidiandynamics/kafdrop/actions/runs/12143699503/job/33995776344?pr=703#step:4:227): Wrong indent style found (tabs instead of spaces)
  	227: Wrong indent style found (tabs instead of spaces)
  	228: Wrong indent style found (tabs instead of spaces)
  	229: Wrong indent style found (tabs instead of spaces)
  	230: Wrong indent style found (tabs instead of spaces)
  	231: Wrong indent style found (tabs instead of spaces)
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  	238: Wrong indent style found (tabs instead of spaces)
  	240: Wrong indent style found (tabs instead of spaces)
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  	243: Wrong indent style found (tabs instead of spaces)
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  	256: Wrong indent style found (tabs instead of spaces)
  	440: Wrong indent style found (tabs instead of spaces)
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  	454: Wrong indent style found (tabs instead of spaces)
  	455: Wrong indent style found (tabs instead of spaces)
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  	458: Wrong indent style found (tabs instead of spaces)
  	459: Wrong indent style found (tabs instead of spaces)
  	460: Wrong indent style found (tabs instead of spaces)
  src/main/java/kafdrop/util/MessageSerializer.java:
  	Wrong line endings or no final newline
  	Not all lines have the correct end of line character
  	5: Wrong indent style found (tabs instead of spaces)
  src/main/java/kafdrop/util/MsgPackMessageSerializer.java:
  	Wrong line endings or no final newline
  	Not all lines have the correct end of line character
  	12: Wrong indent style found (tabs instead of spaces)
  	13: Wrong indent style found (tabs instead of spaces)
  	14: Wrong indent style found (tabs instead of spaces)
  	15: Wrong indent style found (tabs instead of spaces)
  	16: Wrong indent style found (tabs instead of spaces)
  	17: Wrong indent style found (tabs instead of spaces)
  	18: Wrong indent style found (tabs instead of spaces)
  	19: Wrong indent style found (tabs instead of spaces)
  	20: Wrong indent style found (tabs instead of spaces)
  	21: Wrong indent style found (tabs instead of spaces)
  	22: Wrong indent style found (tabs instead of spaces)
  	23: Wrong indent style found (tabs instead of spaces)
  	24: Wrong indent style found (tabs instead of spaces)
  	25: Wrong indent style found (tabs instead of spaces)
  src/main/java/kafdrop/model/CreateMessageVO.java:
  	Wrong line endings or no final newline
  	Not all lines have the correct end of line character
  	9: Wrong indent style found (tabs instead of spaces)
  	10: Wrong indent style found (tabs instead of spaces)
  	11: Wrong indent style found (tabs instead of spaces)
  	12: Wrong indent style found (tabs instead of spaces)
  	13: Wrong indent style found (tabs instead of spaces)
  	14: Wrong indent style found (tabs instead of spaces)
  	15: Wrong indent style found (tabs instead of spaces)
  	16: Wrong indent style found (tabs instead of spaces)
  src/main/java/kafdrop/util/ProtobufMessageSerializer.java:
  	Wrong line endings or no final newline
  	Not all lines have the correct end of line character
  	24: Wrong indent style found (tabs instead of spaces)
  	25: Wrong indent style found (tabs instead of spaces)
  	27: Wrong indent style found (tabs instead of spaces)
  	29: Wrong indent style found (tabs instead of spaces)
  	30: Wrong indent style found (tabs instead of spaces)
  	31: Wrong indent style found (tabs instead of spaces)
  	32: Wrong indent style found (tabs instead of spaces)
  	34: Wrong indent style found (tabs instead of spaces)
  	35: Wrong indent style found (tabs instead of spaces)
  	36: Wrong indent style found (tabs instead of spaces)
  	37: Wrong indent style found (tabs instead of spaces)
  	39: Wrong indent style found (tabs instead of spaces)
  	40: Wrong indent style found (tabs instead of spaces)
  	41: Wrong indent style found (tabs instead of spaces)
  	42: Wrong indent style found (tabs instead of spaces)
  	43: Wrong indent style found (tabs instead of spaces)
  	44: Wrong indent style found (tabs instead of spaces)
  	46: Wrong indent style found (tabs instead of spaces)
  	47: Wrong indent style found (tabs instead of spaces)
  	49: Wrong indent style found (tabs instead of spaces)
  	50: Wrong indent style found (tabs instead of spaces)
  	51: Wrong indent style found (tabs instead of spaces)
  	52: Wrong indent style found (tabs instead of spaces)
  	53: Wrong indent style found (tabs instead of spaces)
  	54: Wrong indent style found (tabs instead of spaces)
  	55: Wrong indent style found (tabs instead of spaces)
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  	66: Wrong indent style found (tabs instead of spaces)
  	67: Wrong indent style found (tabs instead of spaces)
  	68: Wrong indent style found (tabs instead of spaces)
  	69: Wrong indent style found (tabs instead of spaces)
  	70: Wrong indent style found (tabs instead of spaces)
  	71: Wrong indent style found (tabs instead of spaces)
  	72: Wrong indent style found (tabs instead of spaces)
  	73: Wrong indent style found (tabs instead of spaces)
  src/main/java/kafdrop/util/SerializationException.java:
  	Wrong line endings or no final newline
  	Not all lines have the correct end of line character
  	5: Wrong indent style found (tabs instead of spaces)
  	6: Wrong indent style found (tabs instead of spaces)
  	7: Wrong indent style found (tabs instead of spaces)
  	8: Wrong indent style found (tabs instead of spaces)
  	9: Wrong indent style found (tabs instead of spaces)
  	10: Wrong indent style found (tabs instead of spaces)
  	11: Wrong indent style found (tabs instead of spaces)
  	12: Wrong indent style found (tabs instead of spaces)
  src/main/java/kafdrop/service/KafkaHighLevelProducer.java:
  	Wrong line endings or no final newline
  	Not all lines have the correct end of line character
  	24: Wrong indent style found (tabs instead of spaces)
  	26: Wrong indent style found (tabs instead of spaces)
  	28: Wrong indent style found (tabs instead of spaces)
  	30: Wrong indent style found (tabs instead of spaces)
  	31: Wrong indent style found (tabs instead of spaces)
  	32: Wrong indent style found (tabs instead of spaces)
  	34: Wrong indent style found (tabs instead of spaces)
  	35: Wrong indent style found (tabs instead of spaces)
  	36: Wrong indent style found (tabs instead of spaces)
  	37: Wrong indent style found (tabs instead of spaces)
  	38: Wrong indent style found (tabs instead of spaces)
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  	40: Wrong indent style found (tabs instead of spaces)
  	41: Wrong indent style found (tabs instead of spaces)
  	42: Wrong indent style found (tabs instead of spaces)
  	43: Wrong indent style found (tabs instead of spaces)
  	44: Wrong indent style found (tabs instead of spaces)
  	45: Wrong indent style found (tabs instead of spaces)
  	46: Wrong indent style found (tabs instead of spaces)
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  	49: Wrong indent style found (tabs instead of spaces)
  	50: Wrong indent style found (tabs instead of spaces)
  	51: Wrong indent style found (tabs instead of spaces)
  	52: Wrong indent style found (tabs instead of spaces)
  	53: Wrong indent style found (tabs instead of spaces)
  	54: Wrong indent style found (tabs instead of spaces)
  	55: Wrong indent style found (tabs instead of spaces)
  	56: Wrong indent style found (tabs instead of spaces)
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  	65: Wrong indent style found (tabs instead of spaces)
  	66: Wrong indent style found (tabs instead of spaces)
  	67: Wrong indent style found (tabs instead of spaces)
  src/main/java/kafdrop/util/Serializers.java:
  	Wrong line endings or no final newline
  	Not all lines have the correct end of line character
  	5: Wrong indent style found (tabs instead of spaces)
  	6: Wrong indent style found (tabs instead of spaces)
  	7: Wrong indent style found (tabs instead of spaces)
  	8: Wrong indent style found (tabs instead of spaces)
  	9: Wrong indent style found (tabs instead of spaces)
  	10: Wrong indent style found (tabs instead of spaces)
  	11: Wrong indent style found (tabs instead of spaces)
  	13: Wrong indent style found (tabs instead of spaces)
  	14: Wrong indent style found (tabs instead of spaces)
  	15: Wrong indent style found (tabs instead of spaces)
  	17: Wrong indent style found (tabs instead of spaces)
  	18: Wrong indent style found (tabs instead of spaces)
  	19: Wrong indent style found (tabs instead of spaces)
  	20: Wrong indent style found (tabs instead of spaces)
  src/main/java/kafdrop/service/KafkaMonitorImpl.java:
  	49: Line too long (159 instead of 120)
  	406: Wrong indent style found (tabs instead of spaces)
  	407: Wrong indent style found (tabs instead of spaces)
  	408: Wrong indent style found (tabs instead of spaces)
  	409: Wrong indent style found (tabs instead of spaces)
  src/main/java/kafdrop/service/KafkaProducerException.java:
  	Wrong line endings or no final newline
  	Not all lines have the correct end of line character
  	8: Wrong indent style found (tabs instead of spaces)
  	9: Wrong indent style found (tabs instead of spaces)
  	10: Wrong indent style found (tabs instead of spaces)
  	11: Wrong indent style found (tabs instead of spaces)
  	12: Wrong indent style found (tabs instead of spaces)
  	13: Wrong indent style found (tabs instead of spaces)
  	14: Wrong indent style found (tabs instead of spaces)
  	15: Wrong indent style found (tabs instead of spaces)
  src/main/java/kafdrop/util/AvroMessageSerializer.java:
  	Wrong line endings or no final newline
  	Not all lines have the correct end of line character
  	10: Wrong indent style found (tabs instead of spaces)
  	11: Wrong indent style found (tabs instead of spaces)
  	13: Wrong indent style found (tabs instead of spaces)
  	14: Wrong indent style found (tabs instead of spaces)
  	15: Wrong indent style found (tabs instead of spaces)
  	16: Wrong indent style found (tabs instead of spaces)
  	18: Wrong indent style found (tabs instead of spaces)
  	19: Wrong indent style found (tabs instead of spaces)
  	20: Wrong indent style found (tabs instead of spaces)
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  	24: Wrong indent style found (tabs instead of spaces)
  	25: Wrong indent style found (tabs instead of spaces)
  	26: Wrong indent style found (tabs instead of spaces)
  	27: Wrong indent style found (tabs instead of spaces)
  	28: Wrong indent style found (tabs instead of spaces)
  	29: Wrong indent style found (tabs instead of spaces)
  	30: Wrong indent style found (tabs instead of spaces)
  	31: Wrong indent style found (tabs instead of spaces)
  	32: Wrong indent style found (tabs instead of spaces)
  	33: Wrong indent style found (tabs instead of spaces)
  	34: Wrong indent style found (tabs instead of spaces)
  
243 errors found

[nguyen-tri-nhan]

Thank you for your review @Bert-R, I've resolved your request change and linter fail as well. Hope the linter feels happy

[nguyen-tri-nhan]

I am changing the IDE line separator for each file to LF, hope it run well with linter

[Bert-R]

@nguyen-tri-nhan Looks good. Thanks!

[ydan002]

@nguyen-tri-nhan very useful feature!, however, is there any way to have this as a feature flag so it can be disabled in production environment?

[Bert-R]

@ydan002 Feel free to create a PR to propose such a feature flag