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HostFunctions is a process-wide singleton (one per gateway engine). Its `invCtx` field is shared across all WASM instances. For STATELESS execution the executor sets/clears it per-call but the lock is released before WASM runs — two concurrent invocations can race on the field and one's host call can read the other's identity. Window is microseconds. For PERSISTENT WS the bug was much worse: invCtx used to be bound ONCE at instantiation and reused for the connection's lifetime. Two simultaneous persistent WS connections from different namespaces / wallets overwrote each other's invCtx, and EVERY subsequent function_invoke / GetCallerJWTSubject / GetCallerWallet / GetSecret call from inside the WASM read whatever was bound LAST. Result: silent identity leak across tenants for as long as the connections overlapped. Fix: per-call invCtx propagation through Go's context.Context. wazero passes the ctx given to api.Function.Call through to host function callbacks, so every WASM-host hop carries its own invCtx. - pkg/serverless/invocation_context.go (new): WithInvocationContext + InvocationContextFromCtx helpers using an unexported invCtxKey. - pkg/serverless/hostfunctions/invocation_context.go (new): currentInvocationContext(ctx) — ctx-attached invCtx wins over the singleton field. - All host accessors (FunctionInvoke, GetEnv, GetSecret, GetRequestID, GetCallerWallet, GetWSClientID, GetCallerClaim, GetCallerJWTSubject) now route through currentInvocationContext(ctx). - pkg/serverless/persistent/instance.go: every export call's ctx is wrapped with the per-instance invCtx before being passed to wazero. - pkg/gateway/handlers/serverless/ws_persistent_handler.go: invCtx is built per-frame and attached to ctx, not stored on a shared field. - pkg/serverless/engine.go: removed the SetInvocationContext call at InstantiatePersistent (no longer needed; ctx carries it). Stateless still uses the singleton field — its race is latent since the host-functions split and migrating it is a separate scoped change. Tests: - hostfunctions/invocation_context_test.go covers ctx-wins-over-singleton. - gateway/handlers/serverless/ws_persistent_handler_test.go covers the per-frame ctx wiring. - cli/functions/build_test.go is new coverage for the build path touched in this change. VERSION bumped to 0.122.24.
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0.122.24
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