Closes §8.43's 'version-mismatch-specific client messaging' gap. Per
the user's explicit go-ahead to design new server behavior for this
(rather than only wiring up something that already existed, the
pattern every other fix this session followed): before this, there
was no server-side protocol rejection at all. queue_create accepted
any protocol_version >= 1 unconditionally, so an outdated client could
only ever discover a mismatch by waiting in the queue forever
unmatched -- the matcher's own compatibility check requires every
formed player to share an identical protocol_version -- with no error
and no explanation given to the player.
Server: Service.MinProtocolVersion (opt-in, zero by default so every
existing caller keeps accepting protocol_version 1 unconditionally)
rejects a below-floor queue_create with 426 Upgrade Required /
client_outdated before the request ever reaches the candidate
provider. Wired via cmd/control-plane's new --min-protocol-version
flag (validated non-negative at startup).
Client: ControlPlaneClient recognises HTTPClient.RESPONSE_UPGRADE_REQUIRED
on queue_create specifically and sets a distinct 'Your client is out
of date -- please update to continue searching' message instead of
the server's raw generic error string, and clears _last_queue_create
so can_retry_queue_create() never offers 'Retry Search' for a failure
that retrying with the same build can never fix.
Verified: go build/vet/test -race clean across every server package.
TestQueueCreateEnforcesMinProtocolVersion covers below-floor rejection
(candidate provider never reached), exactly-at-floor acceptance, and
the error body naming client_outdated; TestQueueCreateMinProtocolVersionZeroIsDisabled
proves the opt-in default doesn't change behavior for every existing
caller. Godot: test_outdated_client_receives_a_distinct_message_and_no_retry_offer
proves the distinct message and suppressed retry offer. Full Godot
suite (217/217, 0 failed, no crash), full make verify-multiplayer-local
gate, zero new crash reports.
A player who completed the entire queue -> proposal -> allocate ->
assign pipeline would reach ASSIGNED, see "Your match server is
ready", and then simply sit there forever. connect_to_assignment()
existed in control_plane_client.gd, fully validated (checks the
assignment is available and fresh, splits and validates the
endpoint, carries the join authorisation via MatchNet's hello payload
rather than the URL) with its own assignment_connection_started/
assignment_connection_failed signals, and multiplayer-next.md's own
§8.41 row already described it as wired -- but grepping the whole
client found zero callers. Nothing anywhere in matchmaking.gd or
control_plane_client.gd itself ever invoked it.
ControlPlaneClient._connect_when_assigned() now calls it automatically
the moment state.phase reaches ASSIGNED. Wired into the single call
site every queue-shaped HTTP response already shares (heartbeat,
recover, and resync-triggered recover alike, since the WebSocket
match-lifecycle path always funnels into a REST resync first), so
both the ordinary poll path and the WebSocket-push path are covered
without a second call site to keep in sync. Two orderings are handled:
if the assignment fetch triggered earlier by ASSIGNMENT_READY has
already completed, it connects immediately; if not, it defers via
_pending_connect_match_id and resolves once the assignment becomes
available. _connect_attempted_match_id guards against a duplicate or
replayed ASSIGNED event reattempting the connection.
Verified against the real Godot 4.7.1 binary now that headless
testing has resumed: two new test_control_plane_client.gd tests cover
both orderings and the duplicate-attempt guard directly (216/216
total, 0 failed, no crash, no engine-level error, stable across
repeated runs); full make verify-multiplayer-local and the complete
make verify-enet-integration suite (all five cases, including the
3-process match) both pass clean; zero new crash reports throughout.
multiplayer-next.md's §8.41 row is corrected to describe what was
actually true (connect_to_assignment existed but was never called)
rather than repeating the prior, inaccurate 'already wired' claim.
Closes most of §8.43's 'decline, regional outage retry UI, failed
reconnect, duplicate-action recovery beyond proposals' remaining
list -- turned out to be mostly stale doc, not missing code.
matchmaking.gd's decline button/handler already existed
(%DeclineButton, _on_decline_pressed, visibility toggled by
MatchmakingState.PROPOSED alongside accept). ControlPlaneClient's
can_retry_last_mutation()/retry_last_mutation() -- the generic
'duplicate-action recovery beyond proposals' and 'regional outage
retry' mechanism -- also already existed: any mutation (not just a
proposal response) becomes retryable on a transport failure or a
408/429/503 response, and matchmaking.gd's queue button already fell
back to it ('Retry Request'). Neither had any test coverage proving
the mechanism actually works for a non-proposal mutation --
is_retryable_mutation_response's pure classification was the only
thing tested.
Two new tests: test_generic_mutation_retry_recovers_after_a_transient_failure
proves can_retry_last_mutation() transitions from false (mutation
in flight) to true after a transport-level failure on an ordinary
queue_heartbeat, exactly the 'regional outage' case; test_generic_mutation_retry_is_not_offered_for_unsafe_failures
proves a 409 (revision conflict) is never offered as a blind retry
and that retry_last_mutation() fails closed with ERR_INVALID_DATA
rather than resending a stale mutation. retry_last_mutation's literal
network dispatch (HTTPRequest.request()) is not exercised -- it needs
a live SceneTree that test_runner.tscn's synchronous single-_ready()
execution model cannot provide mid-suite; the two tests cover the
can_retry_last_mutation() decision boundary and the fail-closed path
instead, which is what's actually new here.
Verified against the real Godot 4.7.1 binary now that headless
testing has resumed: test_runner.tscn 214/214 clean (no crash, no
engine-level error), full make verify-multiplayer-local re-run clean,
zero new crash reports.
Remaining in §8.43: version-mismatch-specific messaging (a protocol
rejection currently surfaces only as the server's generic error
string), failed-reconnect UX, and §8.16's arena selection/long-running
worker integration.
Josh Creek