A hard gateway exit (crash, SIGKILL, supervisor restart) left the
detached Node sidecar running with a token the next gateway run doesn't
know, so it could never be told to /shutdown. Every replacement spawn
then died on EADDRINUSE, failing each 30→300s reconnect attempt while
the orphan kept consuming the inbound gRPC stream.
Two layers:
- Lifetime binding: the adapter now holds the sidecar's stdin as a
pipe, and the sidecar (PHOTON_SIDECAR_WATCH_STDIN=1) shuts down on
stdin EOF — fired by the OS on any parent death, including SIGKILL.
- Startup reaping: before spawning, the adapter probes the port and
terminates a stale listener, but only after verifying its command
line is a Photon sidecar; a foreign listener raises a clear error
instead of being signalled.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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