[Version-unspecific] bifrost(zcash): prefer Zebra raw mempool checks and fallback to getmempoolentry (zcashd)

ZlyDevMayarequested to merge
zoly/zcash-zebra-mempool into develop

Summary

Zebra does not support getmempoolentry in the same way as zcashd, and current behavior produces repeated error logs. This change aligns Bifrost with Zebra-first operation while preserving backward compatibility.

Changes

  • Prefer getrawmempool for tx presence checks (Zebra-compatible path)
  • Fall back to getmempoolentry only when raw mempool RPC is unsupported (Method not found)
  • Keep compatibility with zcashd
  • Reduce noisy fail to get tx(...) from mempool error="Method not found" logs

Summary by CodeRabbit

  • Bug Fixes

    • Enhanced Zcash chain client mempool status verification with improved fallback handling and robust error detection for unavailable RPC methods, ensuring more reliable transaction monitoring.

  • Tests

    • Added comprehensive test coverage for mempool status detection scenarios, including cases where the primary RPC method is unavailable and fallback mechanisms are activated.
Edited by Ghost User

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