feat: add WebSocket subscription service with connection manager and polling fallback#8
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…ling fallback
Implement real-time subscription infrastructure per en-p0ha architecture directive:
- WebSocketConnectionManager: connection pool (one WS per chain), lazy
establishment, reconnection with exponential backoff (1s-30s, 10 retries),
heartbeat (30s ping, 5s pong timeout), subscription registry
- NewHeadsSubscription: eth_subscribe('newHeads') per chain, batch-fetches
balances for all tracked addresses on each new block
- TransferLogsSubscription: ERC-20 Transfer event logs filtered to tracked
addresses using keccak256('Transfer(address,address,uint256)') topic
- PollManager: 30s HTTP polling fallback when WS fails, continuous WS recovery
attempts every 60s, emits same events as WS path (transport-agnostic)
- SubscriptionService: unified API — subscribeBalances, subscribeTokenTransfers,
subscribeNewBlocks, subscribePendingTransactions, subscribeContractEvents,
unsubscribe, getSubscriptionStatus
- EventBus: domain event emitter for 11 event types (WEBSOCKET_CONNECTED,
DISCONNECTED, RECONNECTING, FAILED, SUBSCRIPTION_CREATED/REMOVED,
TRANSPORT_FALLBACK/RESTORED, LIVE_BALANCE/TRANSFER/BLOCK)
- All 8 EVM chains: Ethereum, Polygon, Arbitrum, Optimism, Base, BNB,
Avalanche, Fantom with default WS + HTTP endpoints
- 101 new tests across 6 test files, 985 total tests passing
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Summary
src/subscriptions/moduleSubscriptionServiceorchestrates subscriptions with WebSocket-first, polling fallback strategyWebSocketConnectionManagerhandles connection lifecycle, reconnection, and health monitoringNewHeadsSubscriptionandTransferLogsSubscriptionfor block and ERC20 transfer eventsPollManagerprovides reliable polling fallback when WebSocket unavailableEventBusfor decoupled event distribution across componentsTest plan
MQ: ev-essv | Branch: polecat/obsidian/ev-keps@mlrpglwp