Motivation:
RedisDecoder can get into an infinite loop while decoding bulk strings if the final \r and \n to indicate the end of content are split on ByteBuf boundaries.
Modifications:
- We should break out of the decode loop if remainingBulkLength is 0 and we don't have enough data to read EOL
Result:
No more infinite loop in RedisDecoder#decodeBulkStringContent.
Motivation:
- `RedisBulkStringAggregator` raises errors for multiple null bulk strings.
- Null or empty bulk string has no content, but current `RedisDecoder` generates header and contents.
Modifications:
- Fix decoding null bulk string of `RedisDecoder` for `RedisBulkStringAggregator`.
Result:
- Fixes#5184.
