feat: add circuit breaker protection for Horizon SDK calls - #583
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Abdulazeem-code merged 1 commit intoAug 27, 2026
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Wrap all Stellar Horizon SDK interactions with opossum circuit breakers to prevent cascading timeouts and crashes when Horizon goes down. - Create src/services/stellarService.js as centralized Horizon wrapper with configurable circuit breakers (threshold, timeout, reset) - Add health-check breaker in horizonListener.js that gates stream sync when Horizon is unreachable - Improve stream resilience: dead streams are removed from active map and auto-reconnect on next poll cycle - Wrap loadAccount, fetchTransaction, fetchPaymentsForTransaction, fetchPaymentsForAccount, and paginated export with breakers - Export paginated results with circuit-breaker-protected next() calls - Detect EOPENBREAKER errors in route handlers and return 503 SERVICE_UNAVAILABLE with graceful error messages - All existing tests pass (370/370) - Add 18 new tests for circuit breaker behavior Closes Abdulazeem-code#499
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Summary
This PR wraps all Stellar Horizon SDK interactions with opossum circuit breakers to prevent cascading timeouts and crashes when Horizon goes down.
What changed
New:
src/services/stellarService.jsA centralized Horizon SDK wrapper that provides circuit-breaker-protected versions of all Stellar operations:
loadAccountfetchTransactionfetchPaymentsForTransactionfetchPaymentsForAccountpaginated exportstream health checkUpdated:
horizonListener.jsUpdated: Route handlers (
exportRoutes.js,historyRoutes.js,receiptRoutes.js)EOPENBREAKERerrors from circuit breakers503 SERVICE_UNAVAILABLEwith graceful error messages instead of crashingUpdated:
multisigner-verifier.jsstellarServicewrapperNew:
tests/stellarService.test.jsWhy
When Stellar Horizon experiences downtime or high latency, the SDK calls would hang indefinitely or throw unhandled errors, causing cascading failures across the entire application. Circuit breakers provide:
Testing
Closes #499