Emil Maskovsky e0f58d1e81 raft: fix send_snapshot abort_source lifetime ...

Fix a lifetime bug where `send_snapshot()` captured `abort_source` by
reference and the referenced object could be destroyed before the
continuation ran.

Use a gate-tracked background coroutine for each snapshot transfer:
- keep abort_source on the coroutine frame (stable lifetime)
- store a raw abort_source* in _snapshot_transfers for synchronous abort
- erase transfer slots immediately on abort to allow same-batch reuse
- close _snapshot_gate during abort() to wait for all in-flight transfers

This removes the need for extra aborted-transfer bookkeeping and makes
snapshot transfer shutdown and ownership semantics explicit.

Fixes: SCYLLADB-1234

2026-05-18 21:49:37 +00:00

87 KiB

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