feat: Choose a consensus strategy #286
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Co-authored-by: Thomas Locher <[email protected]>
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Follow-up on #286 to implement the threshold strategy to aggregate responses from multiple providers: - Introduce a top-level `MultiCallResults::reduce` method which takes as parameter a `ConsensusStrategy` to aggregate the various responses. All existing methods, including `eth_fee_history`, were refactor to use the new `reduce` method. - In case of `ConsensusStrategy::Threshold`, the reduction strategy simply consists of returning the most frequent (non-error) response if it appeared at least the specified threshold number of times. - Refactor `MultiCallResults` to stored ok results and errors separately.
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Introduce a new parameter in
RpcConfigto let the caller choose between different consensus strategies to aggregate answers from multiple providers. Two strategies are defined, with the possibility of adding more in the future:Equality: this is the default and matches the current behaviour, where all responses are expected to be non-error cases and all responses are expected to be equal.Threshold: new strategy introduced by this PR, allowing to relax the aforementioned equality strategy to only a subset of the responses. Choosing this strategy may influence the chosen providers to match the specified threshold parameters. The implementation of responses aggregation in this case is done in a separate PR (feat: implement threshold strategy #287).