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Graph/client-host-rpc-semantic-mismatch

AntiPattern

Misrouted Network Semantics

client-host-rpc-semantic-mismatch

Network-facing components and RPCs fail when callers assume cross-context semantics (client vs host), so actions like broadcasts, save diffs, and replicated control state don’t persist or propagate, leaving gameplay behavior inconsistent across peers.

Node Details

Public graph metadata

Updated6/27/2026

Connections

30 linked nodes

MATCHESSolution

Handle server→client synchronization inside the socket event handler (or a centralized layer like middleware) to keep updates consistent and avoid lifecycle coupling. Use component-level listeners only for client→server events where it’s appropriate, ensuring callbacks are registered/unregistered correctly.

MATCHESSolution

Tension: every other upgrade falls through to Next's own upgrade listener. Outcome: No `noServer: true`, no manual `server.on('upgrade', …)`, no path routing.

MATCHESSolution

Move the server action call to a server-side boundary (e.g., a Server Component or route handler/API endpoint) and invoke it from the client via a form submit that triggers the server endpoint/action, or restructure so the action is defined/used in a Server Component while the client component only submits data.

MATCHESSolution

per-deployment provider EXCLUSIVITY as the operating rule — one provider per vector index population. Tension: mixing spaces silently corrupts similarity. Outcome: an embeddingVersion string stamped onto every node at write time so drift is detectable after the fact.

MATCHESSolution

Store only the primitive/client construction parameters (e.g., host/port/path/clientId) in Redux and recreate the Paho client when needed, or manage the live client instance outside Redux (e.g., module singleton/ref or React context) and invoke disconnect from there.

MATCHESSolution

could re-call just the endpoint. Tension: To get away from implementing this retry behavior all over the place.

MATCHESSolution

run a signaling server in the browser — For a mostly offline browser game. Tension: I don't think that you can run a signaling server in the browser. Outcome: run the signaling server in the LAN, and have the peers connect to it.

MATCHESSolution

depending on your latency budget. Outcome: Same idea, but the state lives outside the process boundary.

MATCHESSolution

Update the Context state from within the SignalR handler by invoking context methods (e.g., incorporating/using the patrols and update functions directly in the SignalR call path) so the global state is actually changed when messages arrive.

MATCHESSolution

case "CallbackRouteError": return { error: "Invalid credentials!" } — in my `login.ts` server action in the switch case clause. Tension: to return the correct errors. Outcome: bypass this error.

MATCHESSolution

the server is sending an incorrect response or the program connected to the wrong server — While trying to connect to the server. Tension: we don't have enough information of what is happening on your system. Outcome: I can only guess that the server is sending an incorrect response or the program connected to the wrong server.

MATCHESSolution

[Rpc.Host] — called on host only. Call from any client to run logic on host. — Three RPC attributes with distinct semantics. Tension: Never trust client input in [Rpc.Host] — always validate.

MATCHESSolution

Use Game.ChangeScene() to transition between scenes — In multiplayer: only host can change scene, it broadcasts to all clients. Tension: Developers also don't know how to pass data between scenes. Outcome: Pass data between scenes using static fields or FileSystem.Data.

MATCHESSolution

CollectSyncState() iterates all components, finds [Sync] properties without [Property], serializes them to JSON — in SaveSystem.cs. Tension: Use JSON serialization first, with a ByteStream/BytePack fallback for types that don't serialize cleanly to JSON. Outcome: RestoreSyncState() is called before RestoreNetworkOwnership() in the Load path.

MATCHESSolution

OnDisconnected destroys the PlayerData GameObject and removes the player from the UndoSystem. — GameManager implements INetworkListener. Tension: Clean up undo stacks. Outcome: OnDisconnected destroys the PlayerData GameObject and removes the player from the UndoSystem.

MATCHESSolution

Add a MorphState component that stores morphs as a serialized JSON string in a [Property] field, apply changes on the host, broadcast via [Rpc.Broadcast], and restore in OnStart().

MATCHESSolution

Use `NetDictionary<string, int>` keyed by `AmmoResource.ResourcePath` — with `[Sync(SyncFlags.FromHost)]`. Outcome: Client-side mutations are optimistic (return immediately) and route to `[Rpc.Host]` for authoritative validation.

MATCHESSolution

Avoid relying on the pure SSE push write path for server-initiated notifications; use a different delivery mechanism per client (e.g., webhook/polling/channel-specific adapter) with capability negotiation and graceful degradation. Alternatively, patch/upgrade the Hono dependency or change the transport implementation so SSE writes never attempt res.writeHead() after headers are sent, and ensure failures propagate to the notifier.

MATCHESSolution

Don't build per-client adapters. — client capabilities change with updates. Tension: They become a maintenance nightmare — every new feature needs N implementations. Outcome: one delivery function that degrades.

MATCHESSolution

capability detection → graceful fallback → DB queue for stateless clients — support all of these. Tension: There's no single mechanism that works everywhere. Outcome: capability negotiation is the only viable pattern.

MATCHESSolution

Removed lazy registration from the shared MCP call path — shared MCP call path. Outcome: restored direct gating using the original agent id.

MATCHESSolution

ShootEffects is [Rpc.Broadcast] — muzzle flash/impact effects. Tension: for muzzle flash/impact effects. Outcome: [Rpc.Broadcast].

MATCHESSolution

Replaced verbose node/edge/done NDJSON frames with a compact tuple-based protocol and a format header — while keeping the client parser backward-compatible with the previous object protocol. Outcome: keeping the client parser backward-compatible with the previous object protocol.

MATCHESSolution

Build the graph from edge candidates first — the web proxy was forwarding the old backend stream. Tension: a retry needed to be robust even when the backend deployment lagged. Outcome: over-fetches graph candidates from the backend, drops disallowed instance/evidence nodes, maps canonical edge endpoints to concrete type:id renderer ids, assigns connected-component communities, prunes isolated nodes, and trims back to the requested render budget.

MATCHESSolution

The Facepunch Sandbox demonstrates the canonical s&box GameManager pattern — public sealed partial class GameManager : GameObjectSystem<GameManager>, Component.INetworkListener, ISceneStartup, IScenePhysicsEvents, ICleanupEvents, Global.ISaveEvents. Tension: Properly implementing INetworkListener for host/client coordination.

MATCHESSolution

Use for persistent state that all clients need. — [Sync] Attribute - State Replication. Outcome: Use for actions, events, and host-authoritative operations.

MATCHESSolution

Facepunch Sandbox implements a GameObjectSystem-based ban system with INetworkListener. — Load from LocalData on startup. Tension: INetworkListener - blocks at connection time. Outcome: Reject con.

MATCHESSolution

Kept the protocol mismatch as a classified close cause — Added [REDACTED] and scoped device-auth invalidation for auth-state migrations, but did not clear unrelated browser storage. Tension: The real remediation for the observed loop is closing or hard-refreshing the stale tab so it loads the current SPA bundle. Outcome: Browser harness evidence classified the failure as protocol mismatch with high confidence, while fresh navigation connected normally.

MATCHESSolution

Gate activity-page RPCs on the host app's post-handshake connected state instead of the raw WebSocket-open flag, while still checking `ws.readyState === 1` — activity-page RPCs. Tension: The page checked the gateway browser client for an open WebSocket and then immediately sent RPCs such as session subscribe/list/history. Outcome: Gate activity-page RPCs on the host app's post-handshake connected state instead of the raw WebSocket-open flag, while still checking `ws.readyState === 1`.

MATCHESSolution

Hardened migration/model-ref resolution — the deprecated provider id is treated only as a legacy alias for the CLI runtime. Tension: stale refs are canonicalized to Anthropic model refs, old allowlist keys are removed, and external CLI OAuth sync recognizes the legacy alias. Outcome: external CLI OAuth sync recognizes the legacy alias.

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