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fix(node): make large WireGuard edits and restarts reliable - #908
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WalkthroughNode updates compare connection signatures before stopping remote backends. Large WireGuard starts synchronize users in batches after the initial Start RPC. Modifications force a start only when ChangesNode lifecycle updates
Priority: ➖ Normal Estimated code review effort: 3 (Moderate) | ~20 minutes Change: Bug fix Sequence Diagram(s)sequenceDiagram
participant StartFlow as _start_or_attach_node
participant Node as PasarGuardNode
participant Manager as NodeManager
StartFlow->>Node: Start with empty users for large WireGuard node
StartFlow->>Manager: sync_users_batched(users, batch_size=100)
Manager->>Node: Apply user batches
Manager-->>StartFlow: Return node or None
Suggested reviewers: Merge Risk: ⚪ Minimal · up to No merge-blocking issue was established. Metadata-only edits preserve the running backend, while a raised batch error stops the partially started backend. Pre-merge checks |
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Check name Status Explanation Description Check Check skipped - CodeRabbit’s high-level summary is enabled. Title check The title clearly summarizes the main changes: reliable handling of large WireGuard updates and backend restarts. Linked Issues check Check skipped because no linked issues were found for this pull request. Out of Scope Changes check Check skipped because no linked issues were found for this pull request.
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Inline comments:
In `@app/operation/node.py`:
- Around line 298-335: The sync failure cleanup after sync_users_batched must be
serialized with the per-node sync lock and guarded by a node identity check.
Before calling pg_node.stop(), reacquire the lock, verify
node_manager.get_node(db_node.id) is pg_node, and stop only in that case;
preserve the existing NodeAPIError propagation.
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Inline comments:
In `@app/operation/node.py`:
- Around line 329-334: Update the exception handling around
node_manager.sync_users_batched to catch asyncio.CancelledError separately,
shield the identity-checked stop_node_if_current cleanup from cancellation, and
re-raise the original cancellation afterward; preserve the existing NodeAPIError
handling for ordinary exceptions and add coverage cancelling after the first
batch.
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Inline comments:
In `@app/operation/node.py`:
- Line 321: Wrap the awaited batched PasarGuardNode.start() call in cancellation
handling so cancellation triggers the same shielded, identity-checked cleanup
used by the existing batched-sync path, including stop_node_if_current, before
re-raising the cancellation. Add a regression test that cancels after Start
dispatch but before start() returns and verifies remote cleanup occurs.
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A WireGuard Start with at least WIREGUARD_BATCHED_START_THRESHOLD users sends an empty peer list and then applies the snapshot in batches of WIREGUARD_START_BATCH_SIZE through sync_users_chunked. Smaller WireGuard starts and Xray starts keep the full user list in Start. On a failed batch the node is stopped while it is still the manager's current object; if an edit replaced it between Start and the batches it is left alone. Cancelling the start mid-batch stops the current node.
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Brings in PasarGuard#903 (lifecycle preemption of user syncs) and the rest of dev. Conflict in app/node/__init__.py: - update_node: keep PasarGuard#903's structure (early unchanged-signature return before the lock, preemption only on a connection change, re-check under the lock) and this branch's existing_signature read under the reader lock, which feeds remote_stop=existing_signature != signature. - keep this branch's _sync_user_batches helper and PasarGuard#903's _sync_users_to_node (node may be None, lock taken per batch, tracked for preemption); the shared-store branch from this side is already inside PasarGuard#903's version.
sync_users_batched holds the per-node lock for every batch of a large WireGuard start, so an address change or a removal of the node had to wait for the whole peer set. Run it in a tracked task through the same helper as sync_full (_run_preemptible_sync): a connection change or a removal cancels only the batches, never the connect task that awaits them, and the caller gets UserSyncPreemptedError. _start_or_attach_node maps that to NodeAPIError(-4), which connect_node treats as a skip: the preempting operation already decides whether the old backend is stopped (remote_stop) and reconnects the node, so the preempted start neither stops it again nor writes an error status. A metadata-only edit still waits for the batched start to finish and then swaps the bridge object without a remote Stop.
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Summary
Editing an active node used to force a Stop/Start cycle even for metadata-only changes. On WireGuard nodes with thousands of peers, a real restart also embedded the complete peer list in the lifecycle request, which could exceed the startup timeout.
Testing
python -m pytest tests/test_node_manager.py tests/test_node_manager_sync.py tests/test_node_start_timeout.py tests/test_connect_concurrency.py -q— 23 passed.python -m ruff check app/operation/node.py app/node/__init__.py— passed.git diff --check— passed.Scope
Only
app/node/__init__.pyandapp/operation/node.pyare changed. No tests, documentation, migrations, dependencies, or generated files are included.Summary by CodeRabbit
Bug Fixes
Performance