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* Add a function to deterministically decide which Serai blocks should be co-signed Has a 5 minute latency between co-signs, also used as the maximal latency before a co-sign is started. * Get all active tributaries we're in at a specific block * Add and route CosignSubstrateBlock, a new provided TX * Split queued cosigns per network * Rename BatchSignId to SubstrateSignId * Add SubstrateSignableId, a meta-type for either Batch or Block, and modularize around it * Handle the CosignSubstrateBlock provided TX * Revert substrate_signer.rs to develop (and patch to still work) Due to SubstrateSigner moving when the prior multisig closes, yet cosigning occurring with the most recent key, a single SubstrateSigner can be reused. We could manage multiple SubstrateSigners, yet considering the much lower specifications for cosigning, I'd rather treat it distinctly. * Route cosigning through the processor * Add note to rename SubstrateSigner post-PR I don't want to do so now in order to preserve the diff's clarity. * Implement cosign evaluation into the coordinator * Get tests to compile * Bug fixes, mark blocks without cosigners available as cosigned * Correct the ID Batch preprocesses are saved under, add log statements * Create a dedicated function to handle cosigns * Correct the flow around Batch verification/queueing Verifying `Batch`s could stall when a `Batch` was signed before its predecessors/before the block it's contained in was cosigned (the latter being inevitable as we can't sign a block containing a signed batch before signing the batch). Now, Batch verification happens on a distinct async task in order to not block the handling of processor messages. This task is the sole caller of verify in order to ensure last_verified_batch isn't unexpectedly mutated. When the processor message handler needs to access it, or needs to queue a Batch, it associates the DB TXN with a lock preventing the other task from doing so. This lock, as currently implemented, is a poor and inefficient design. It should be modified to the pattern used for cosign management. Additionally, a new primitive of a DB-backed channel may be immensely valuable. Fixes a standing potential deadlock and a deadlock introduced with the cosigning protocol. * Working full-stack tests After the last commit, this only required extending a timeout. * Replace "co-sign" with "cosign" to make finding text easier * Update the coordinator tests to support cosigning * Inline prior_batch calculation to prevent panic on rotation Noticed when doing a final review of the branch.
Coordinator
The Serai coordinator communicates with other coordinators to prepare batches for Serai and sign transactions.
In order to achieve consensus over gossip, and order certain events, a micro-blockchain is instantiated.