Replace snowball/snowflake interface with single shared snow interface #2717
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aaronbuchwald
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Signed-off-by: aaronbuchwald <aaron.buchwald56@gmail.com>
Signed-off-by: aaronbuchwald <aaron.buchwald56@gmail.com>
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Signed-off-by: Stephen Buttolph <stephen@avalabs.org>
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Why this should be merged
This PR replaces the separate snowball/snowflake interfaces for the Unary, Binary, and Nnary consensus types with a single shared snow interface.
The only difference that we change is previously
UnarySnowballhad aRecordPollPreferencefunction whereasUnarySnowflakedid not. The reason for this is that in the unary case, there is only one possible preference and we have not received enough votes to increment our confidence towards finalizing.Therefore, in the snowball case where we maintain a confidence counter for preference, this has the impact of increasing our confidence in our current preference even though we don't get closer to finalizing.
In snowflake, there is no notion of incrementing confidence in our preference, so
RecordPollPreferencesimply resets the confidence counter on a unary instance.This also removes the slush interfaces since there is only a single implementation.
How this works
This code change is intended solely as a refactor to reduce instances where we have an interface where there is only a single implementation.
How this was tested
This was tested with the existing unit tests and uses the same snowball/snowflake consensus factory as the unit tests previously used since the current tests are specific to the snowball/snowflake implementation behaviors.