feat(raft): add Raft consensus layer with openraft#98
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Implement the Raft consensus layer based on openraft 0.9, including: - TypeConfig with RaftRequest/RaftResponse enums for Put/Delete/Txn - AetherStateMachine: applies committed log entries to in-memory store (BTreeMap placeholder, will be replaced with RocksDB in next PR) - AetherLogStore: persists Raft logs and vote state in RocksDB column families (raft_log, raft_state) with sync writes - AetherNetwork: stub RaftNetwork implementation for inter-node RPC (will be wired with tonic gRPC in API layer PR) - SnapshotManager: disk-based snapshot file management Dependencies added: openraft, tonic, prost, rkyv, futures, serde_json
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Summary
Raft consensus layer based on openraft 0.9. State machine uses in-memory BTreeMap as placeholder — will be replaced with RocksDB in the next PR.
Changes
src/raft/mod.rs — TypeConfig definition, RaftRequest/RaftResponse enums, and data types (KeyValue, Compare, etc.) shared across all Raft modules.
src/raft/state_machine.rs — RaftStateMachine implementation. Applies committed log entries: Put/Delete modify state, Txn supports compare-and-swap, Get/Range are read-only and don't go through Raft log.
src/raft/log_store.rs — RaftLogStorage implementation backed by RocksDB column families (raft_log, raft_state). All writes use sync for durability.
src/raft/network.rs — RaftNetworkFactory/RaftNetwork stub. Will be wired with tonic gRPC in the API layer PR.
src/raft/snapshot.rs — SnapshotManager for disk-based snapshot file I/O.
Cargo.toml — Added openraft, tonic, prost, rkyv, futures, serde_json dependencies.