24 lines
1.3 KiB
Markdown
24 lines
1.3 KiB
Markdown
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# 0027. Server probe tool and opt-in live-server test
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- **Status:** Accepted
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- **Area:** Testing
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- **Recorded:** 2026-11-03 (retroactive: reconstructed from code, comments and changelog)
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## Context
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Servers differ (Fulcrum, ElectrumX, electrs), can be on the wrong chain, lag behind or serve invalid proofs. The fake server cannot reveal how a real deployment behaves.
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## Decision
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`tests/PalladiumWallet.ServerProbe` is a read-only CLI that runs black-box checks against real servers through the wallet's own `ElectrumClient`: handshake and TLS fingerprint, `server.features` (genesis and `sha256`), tip freshness, genesis header, header linkage, a Merkle proof of a recent coinbase against the header root, fees, peers, error handling, latency and a pipelined burst, plus a cross-server tip comparison. `LiveServerTests` runs it from `dotnet test` only when `PALLADIUM_TEST_SERVERS` is set, so the default run stays offline.
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## Consequences
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- Operators and developers can qualify a server before using it.
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- The live test depends on third-party availability and is therefore opt-in.
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- The probe reuses production client code, so a pass means the wallet can use the server.
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## References
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- `tests/PalladiumWallet.ServerProbe/Program.cs`
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- `tests/PalladiumWallet.Tests/Net/LiveServerTests.cs`
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