fix(dash-spv): stop a client that is still starting - #1101
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`run()` blocked until the client stopped, so every caller spawned it in a task of its own. A `stop()` that came in before that task finished starting found the client not running yet, returned without doing anything, and `run()` then started and kept syncing. Through the FFI, `dash_spv_ffi_client_stop` right after `dash_spv_ffi_client_run` aborted the run task after a 5 second timeout and left the managers, the network and the storage running. `run()` now starts the client and returns: it starts the sync managers, the network and the storage, spawns the sync loop and keeps its handle. `stop()` cancels the loop, waits for it and stops the rest. Both hold a lock for the whole call, so a `stop()` during a start waits for it and then stops the client. The loop handle replaces the `running` watch: `is_running()` checks whether there is one and is now async. A second `run()` on a running client returns `Ok`, as `stop()` already does on a stopped one. When the sync loop fails, it reports the error through `on_error` and stops the client. The storage worker now starts last, so a failed start leaves nothing running. Callers no longer spawn `run()`: the FFI drops its run task and returns the startup error from `dash_spv_ffi_client_run`, and the binary, the examples and the bench wait for Ctrl-C or their own condition before calling `stop()`. The restart tests now stop and run the same client several times in a row, and clear its storage between runs. `wallet_integration_test.rs` is removed: it only checked that a client can be created, that an empty wallet manager is empty, and that the running flag flips without peers. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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📝 WalkthroughWalkthroughThe client lifecycle now separates startup from the background sync loop: ChangesClient lifecycle
Priority: ➖ Normal Estimated code review effort: 3 (Moderate) | ~20 minutes Change: Bug fix Sequence Diagram(s)sequenceDiagram
participant Caller
participant DashSpvClient
participant SyncCoordinator
participant Network
participant Storage
participant SyncLoop
Caller->>DashSpvClient: run()
DashSpvClient->>SyncCoordinator: start coordinator
DashSpvClient->>Network: start networking
DashSpvClient->>Storage: start storage
DashSpvClient->>SyncLoop: spawn background loop
DashSpvClient-->>Caller: return after startup
Caller->>DashSpvClient: stop()
DashSpvClient->>SyncLoop: cancel and await loop
DashSpvClient->>SyncCoordinator: shut down coordinator
DashSpvClient->>Network: shut down network
DashSpvClient->>Storage: shut down storage
Suggested reviewers: Merge Risk: 🟡 Moderate · up to After a sync failure, restarting the client can appear to succeed but leave it stopped. Make failure cleanup safe across restarts before merging. Security Architecture ReviewSecurity architecture risk: 🟡 Moderate · up to The change fixes startup/shutdown ordering, but delayed failure cleanup can stop a newly restarted client. This threatens recovery and continued synchronization for that client. No new privilege or cross-client access was demonstrated. Retained concerns
Security review detailsSecurity Blast Radius
Security Findings and Attack Paths
Trust Boundaries and Controls
Resilience and Maintainability Implications
Hardening Proposals
🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 75.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 32 functions across 18 files. (1 skipped: 1 unsupported.) ✨ Finishing Touches 💡 1📝 Generate docstrings 💡
🧪 Generate unit tests (beta)
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Codecov Report❌ Patch coverage is
Additional details and impacted files@@ Coverage Diff @@
## dev #1101 +/- ##
==========================================
+ Coverage 77.42% 77.57% +0.14%
==========================================
Files 320 320
Lines 81338 81328 -10
==========================================
+ Hits 62976 63088 +112
+ Misses 18362 18240 -122
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Inline comments:
Review comments at @dash-spv/src/client/sync_coordinator.rs:
- Around line 160-169: Make failure cleanup specific to the failed sync-loop
generation: keep its identity check and teardown serialized under the sync_loop
lock so deferred cleanup cannot stop a replacement loop. Update run() to clean
up a finished loop under that same lock before deciding whether to return
success or start a replacement.
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📒 Files selected for processing (20)
dash-spv-bench/src/main.rsdash-spv-ffi/FFI_API.mddash-spv-ffi/src/bin/ffi_cli.rsdash-spv-ffi/src/client.rsdash-spv-ffi/tests/unit/test_client_lifecycle.rsdash-spv/examples/filter_sync.rsdash-spv/examples/simple_sync.rsdash-spv/examples/spv_with_wallet.rsdash-spv/src/client/core.rsdash-spv/src/client/lifecycle.rsdash-spv/src/client/mod.rsdash-spv/src/client/sync_coordinator.rsdash-spv/src/lib.rsdash-spv/src/main.rsdash-spv/tests/dashd_masternode/setup.rsdash-spv/tests/dashd_masternode/tests_sync.rsdash-spv/tests/dashd_sync/setup.rsdash-spv/tests/dashd_sync/tests_restart.rsdash-spv/tests/peer_test.rsdash-spv/tests/wallet_integration_test.rs
💤 Files with no reviewable changes (1)
- dash-spv/tests/wallet_integration_test.rs
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When the sync loop failed, it spawned a `stop()` that waited for the lock. Until that stop got it, a `run()` found the failed loop stored, returned `Ok` and the client was stopped right after. And if a caller stopped the failed loop and started a new one first, the deferred stop stopped the new, healthy loop. A failed loop has its `shutdown` token cancelled while it is still stored, which a stopped loop never is. The deferred stop is now `stop_failed()`, which stops only such a loop, `run()` tears one down before starting again, and `is_running()` no longer counts it. All three go through `stop_locked()`, the teardown `stop()` does under the lock. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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run()blocked until the client stopped, so every caller spawned it in a task of its own. Astop()that came in before that task finished starting found the client not running yet, returned without doing anything, andrun()then started and kept syncing. Through the FFI,dash_spv_ffi_client_stopright afterdash_spv_ffi_client_runaborted the run task after a 5 second timeout and left the managers, the network and the storage running.run()now starts the client and returns: it starts the sync managers, the network and the storage, spawns the sync loop and keeps its handle.stop()cancels the loop, waits for it and stops the rest. Both hold a lock for the whole call, so astop()during a start waits for it and then stops the client. The loop handle replaces therunningwatch:is_running()checks whether there is one and is now async. A secondrun()on a running client returnsOk, asstop()already does on a stopped one. When the sync loop fails, it reports the error throughon_errorand stops the client.The storage worker now starts last, so a failed start leaves nothing running.
Callers no longer spawn
run(): the FFI drops its run task and returns the startup error fromdash_spv_ffi_client_run, and the binary, the examples and the bench wait for Ctrl-C or their own condition before callingstop().The restart tests now stop and run the same client several times in a row, and clear its storage between runs.
wallet_integration_test.rsis removed: it only checked that a client can be created, that an empty wallet manager is empty, and that the running flag flips without peers.PR Hygiene ·
4cef656/self-revieweddash-spv-bench/src/main.rs,dash-spv-ffi/FFI_API.md,dash-spv-ffi/src/bin/ffi_cli.rsand 2 more) — QuantumExplorer or xdustinfacedash-spv(dash-spv/examples/filter_sync.rs,dash-spv/examples/simple_sync.rs,dash-spv/examples/spv_with_wallet.rsand 12 more) — QuantumExplorer or xdustinfaceWhen every box is checked the
PR Hygienecheck passes and this can merge.Summary by CodeRabbit