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Extract warp sync strategy from
ChainSync
(paritytech#2467)
Extract `WarpSync` (and `StateSync` as part of warp sync) from `ChainSync` as independent syncing strategy called by `SyncingEngine`. Introduce `SyncingStrategy` enum as a proxy between `SyncingEngine` and specific syncing strategies. ## Limitations Gap sync is kept in `ChainSync` for now because it shares the same set of peers as block syncing implementation in `ChainSync`. Extraction of a common context responsible for peer management in syncing strategies able to run in parallel is planned for a follow-up PR. ## Further improvements A possibility of conversion of `SyncingStartegy` into a trait should be evaluated. The main stopper for this is that different strategies need to communicate different actions to `SyncingEngine` and respond to different events / provide different APIs (e.g., requesting justifications is only possible via `ChainSync` and not through `WarpSync`; `SendWarpProofRequest` action is only relevant to `WarpSync`, etc.) --------- Co-authored-by: Aaro Altonen <48052676+altonen@users.noreply.github.com>
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