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Router Request Cancellation Propagation

Module

Router

Status

IMPLEMENTED

Description

CANCEL frame type for explicit request cancellation, inflight request tracking, client disconnect detection with automatic cancellation propagation to microservices, and CancellationToken integration in endpoint handlers.

Implementation Details

  • Modules: src/Router/__Libraries/StellaOps.Router.Common/, src/Router/__Libraries/StellaOps.Microservice/
  • Key Classes:
    • RequestDispatcher (src/Router/__Libraries/StellaOps.Microservice/RequestDispatcher.cs) - tracks inflight requests and propagates cancellation tokens
    • PathMatcher (src/Router/__Libraries/StellaOps.Router.Common/PathMatcher.cs) - used in dispatch pipeline with cancellation support
  • Frame Types: CANCEL frame for explicit request cancellation
  • Source: batch_52/file_00.md

E2E Test Plan

  • Send a CANCEL frame for an inflight request and verify the endpoint handler's CancellationToken is triggered
  • Disconnect a client during a long-running request and verify automatic cancellation propagation
  • Verify inflight request tracking: confirm the dispatcher tracks active requests and cleans up after cancellation
  • Verify endpoint handlers receive CancellationToken and can respond to cancellation gracefully
  • Verify cancellation of a non-existent request ID is handled without errors