# Gateway Connection Lifecycle Management

## Module
Gateway

## Status
VERIFIED

## Description
HELLO frame processing for microservice registration, connection lifecycle management with cleanup on disconnect, and `ConnectionManager` hosted service for monitoring active connections.

## Implementation Details
- **Gateway hosted service**: `src/Gateway/StellaOps.Gateway.WebService/Services/GatewayHostedService.cs` -- connection lifecycle management background service (533 lines)
- **Health monitoring**: `src/Gateway/StellaOps.Gateway.WebService/Services/GatewayHealthMonitorService.cs` -- monitors active connections, detects stale instances (107 lines)
- **Metrics**: `src/Gateway/StellaOps.Gateway.WebService/Services/GatewayMetrics.cs` -- connection metrics tracking (40 lines)
- **Configuration**: `src/Gateway/StellaOps.Gateway.WebService/Configuration/GatewayOptions.cs`, `GatewayOptionsValidator.cs`
- **Source**: batch_51/file_22.md

## E2E Test Plan
- [x] Verify HELLO frame processing registers new microservice connections
- [x] Test connection cleanup on client disconnect
- [x] Verify GatewayHealthMonitorService detects stale connections
- [x] Verify edge cases and error handling

## Verification
- **Run ID**: run-002
- **Date**: 2026-02-09
- **Method**: Tier 1 code review + Tier 2d integration tests
- **Build**: PASS (0 errors, 0 warnings)
- **Tests**: PASS (202/202 gateway tests pass)
- **Code Review**:
  - GatewayHostedService: Non-trivial (533 lines). HandleHelloAsync() parses/validates HELLO payloads, builds connection state, registers in routing state. HandleDisconnect() removes connections, invalidates caches, cleans claims.
  - GatewayHealthMonitorService: Real BackgroundService checking stale/degraded connections based on configurable thresholds.
  - Tests: Config/integration tests exist (GatewayOptionsValidatorTests, GatewayIntegrationTests). Caveat: no dedicated unit tests for HELLO frame validation or heartbeat handling logic paths.
- **Verdict**: PASS

## Tier 2 Recheck (2026-02-10)
- **Run ID**: run-003
- **Result**: PASS
- **What was rechecked**: Added deterministic lifecycle regression coverage for `GatewayHostedService` HELLO/heartbeat/disconnect behavior and reran full Gateway suite.
- **Evidence**: `docs/qa/feature-checks/runs/gateway/gateway-connection-lifecycle-management/run-003/tier2-integration-check.json`

## Recheck (run-005)
- **Date**: 2026-02-10
- **Result**: PASS
- **Verification**: Connection lifecycle regression coverage and hosted-service state transitions remain stable.
- **Tests**: Gateway.WebService.Tests 259/259, Router Gateway WebService.Tests 160/160, Router.Gateway.Tests 13/13 (432 total).
- **Evidence**: `docs/qa/feature-checks/runs/gateway/gateway-connection-lifecycle-management/run-005/tier2-integration-check.json`


## Recheck (Run-006)
- **Verified**: 2026-02-10
- **Method**: Tier 2 replay + full Gateway/Router matrix.
- **Tests**: PASS (`src/Gateway/__Tests/StellaOps.Gateway.WebService.Tests`: 259/259; `src/Router/__Tests/StellaOps.Gateway.WebService.Tests`: 160/160; `src/Router/__Tests/StellaOps.Router.Gateway.Tests`: 13/13).
- **Tier 2 Evidence**: `docs/qa/feature-checks/runs/gateway/gateway-connection-lifecycle-management/run-006/tier2-integration-check.json`
- **Outcome**: Checked Gateway feature behavior remains stable in follow-up replay.

## Recheck (Run-007)
- **Verified**: 2026-02-10
- **Method**: Tier 2 integration replay.
- **Tests**: PASS (src/Gateway/__Tests/StellaOps.Gateway.WebService.Tests: 259/259; src/Router/__Tests/StellaOps.Gateway.WebService.Tests: 160/160; src/Router/__Tests/StellaOps.Router.Gateway.Tests: 13/13).
- **Tier 2 Evidence**: `docs/qa/feature-checks/runs/gateway/gateway-connection-lifecycle-management/run-007/tier2-integration-check.json`
- **Outcome**: Gateway/Router behavior for this checked feature remains healthy.
## Recheck (Run-008)
- **Verified**: 2026-02-10
- **Method**: Tier 2 replay with deterministic Gateway+Router suite verification.
- **Tests**: PASS (src/Gateway/__Tests/StellaOps.Gateway.WebService.Tests: 259/259; src/Router/__Tests/StellaOps.Gateway.WebService.Tests: 160/160; src/Router/__Tests/StellaOps.Router.Gateway.Tests: 13/13).
- **Tier 2 Evidence**: docs/qa/feature-checks/runs/gateway/gateway-connection-lifecycle-management/run-008/tier2-integration-check.json
- **Outcome**: Checked gateway behavior remains healthy in continued replay.

## Recheck (Run-009)
- **Verified**: 2026-02-10
- **Method**: Tier 2 replay with deterministic Gateway+Router suite verification.
- **Tests**: PASS (src/Gateway/__Tests/StellaOps.Gateway.WebService.Tests: 259/259; src/Router/__Tests/StellaOps.Gateway.WebService.Tests: 160/160; src/Router/__Tests/StellaOps.Router.Gateway.Tests: 13/13).
- **Tier 2 Evidence**: docs/qa/feature-checks/runs/gateway/gateway-connection-lifecycle-management/run-009/tier2-integration-check.json
- **Outcome**: Checked gateway behavior remains healthy in continued replay.

## Recheck (Run-010)
- **Verified**: 2026-02-10
- **Method**: Tier 2d deterministic integration replay.
- **Tests**: PASS (Gateway.WebService.Tests 259/259, Router.Gateway.WebService.Tests 160/160, Router.Gateway.Tests 13/13).
- **Tier 2 Evidence**: docs/qa/feature-checks/runs/gateway/gateway-connection-lifecycle-management/run-010/tier2-integration-check.json
- **Outcome**: Checked Gateway behavior remains healthy in continued replay.


## Recheck (Run-011)
- **Verified**: 2026-02-10
- **Method**: Tier 2d deterministic integration replay.
- **Tests**: PASS (Gateway.WebService 259/259, Router.Gateway.WebService 160/160, Router.Gateway 13/13; total 432/432).
- **Tier 2 Evidence**: docs/qa/feature-checks/runs/gateway/gateway-connection-lifecycle-management/run-011/tier2-integration-check.json
- **Outcome**: Checked gateway behavior remains healthy in continued replay.
## Recheck (Run-012)
- **Verified**: 2026-02-10
- **Method**: Tier 2d deterministic integration replay.
- **Tests**: PASS (Gateway.WebService 259/259, Router.Gateway.WebService 160/160, Router.Gateway 13/13; total 432/432).
- **Tier 2 Evidence**: docs/qa/feature-checks/runs/gateway/gateway-connection-lifecycle-management/run-012/tier2-integration-check.json
- **Outcome**: Checked gateway behavior remains healthy in continued replay.