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This PR introduces back pressure to the Redis Stream in Block Streamer, ensuring that the stream does not exceed a specified maximum length. This is achieved by blocking the
redis.publish_block()
call, intermittently polling the Stream length, and publishing once it falls below the configured limit.To aid testing, the current
RedisClient
struct has been split in to two:RedisCommands
- thin wrapper around redis commands to make mocking possible.RedisClient
- provides higher-level redis functionality, e.g. "publishing blocks", utilising the above.In most cases,
RedisClient
will be used. The split just allows us to testRedisWrapper
itself.