[claude] Implement graceful degradation test scenarios (#919) #1291

claude · 2026-03-24T01:49:39Z

claude commented

2026-03-24 01:49:39 +00:00

Fixes #919

What this does

Creates tests/infrastructure/test_graceful_degradation.py with 35 targeted test cases covering the service failure paths called out in the issue.

Test coverage added

Ollama health-check failures — connection refused, timeout (OSError), HTTP 503/500, generic exceptions → _check_provider_available returns False and provider is excluded from the cascade.

requests library unavailable — both Ollama and vllm-mlx optimistically assume availability when the requests module is None (matches the graceful-degradation pattern in cascade.py).

Cascade failover: Ollama → Anthropic — end-to-end scenario where Ollama raises a connection error and the cascade router falls back to the Anthropic cloud provider.

Circuit-breaker lifecycle — full CLOSED → OPEN (after N consecutive failures) → HALF_OPEN (after recovery timeout elapses) → CLOSED (after enough successful test calls) cycle, plus failure-in-HALF_OPEN reopens the circuit.

All providers fail — RuntimeError is raised with a combined message listing each provider's individual error.

ClaudeBackend graceful degradation — no API key returns unconfigured message; API error returns unavailable message; health_check() reports ok=False with error details in both cases.

GrokBackend graceful degradation — same patterns as ClaudeBackend.

Chat store (SQLite) resilience — directory auto-creation, concurrent-write safety (5 threads × 10 messages), ordering guarantees, recent() slice, pruning to MAX_MESSAGES.

Fixes #919 ## What this does Creates `tests/infrastructure/test_graceful_degradation.py` with 35 targeted test cases covering the service failure paths called out in the issue. ## Test coverage added **Ollama health-check failures** — connection refused, timeout (OSError), HTTP 503/500, generic exceptions → `_check_provider_available` returns False and provider is excluded from the cascade. **`requests` library unavailable** — both Ollama and vllm-mlx optimistically assume availability when the `requests` module is None (matches the graceful-degradation pattern in cascade.py). **Cascade failover: Ollama → Anthropic** — end-to-end scenario where Ollama raises a connection error and the cascade router falls back to the Anthropic cloud provider. **Circuit-breaker lifecycle** — full CLOSED → OPEN (after N consecutive failures) → HALF_OPEN (after recovery timeout elapses) → CLOSED (after enough successful test calls) cycle, plus failure-in-HALF_OPEN reopens the circuit. **All providers fail** — `RuntimeError` is raised with a combined message listing each provider's individual error. **ClaudeBackend graceful degradation** — no API key returns unconfigured message; API error returns unavailable message; `health_check()` reports `ok=False` with error details in both cases. **GrokBackend graceful degradation** — same patterns as ClaudeBackend. **Chat store (SQLite) resilience** — directory auto-creation, concurrent-write safety (5 threads × 10 messages), ordering guarantees, `recent()` slice, pruning to MAX_MESSAGES.

claude added 1 commit 2026-03-24 01:49:40 +00:00

test: add graceful degradation test scenarios (#919 )

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b10afc0676

Implements the missing test coverage called out in issue #919. Creates
tests/infrastructure/test_graceful_degradation.py covering:

* Ollama health-check failure modes (connection refused, timeout, HTTP 503/500, generic exception)
* requests library unavailable → optimistic availability for Ollama and vllm-mlx
* End-to-end cascade: Ollama fails → Anthropic/cloud fallback used
* Circuit-breaker lifecycle: CLOSED → OPEN (threshold failures) → HALF_OPEN (recovery timeout) → CLOSED (test successes)
* Disabled provider skipped without touching circuit state
* All providers fail → RuntimeError listing individual provider errors
* ClaudeBackend: no key / API error → graceful degraded messages; health_check
* GrokBackend: no key / API error → graceful degraded messages; health_check
* Chat store: SQLite directory auto-creation, concurrent-write safety, pruning, ordering

Fixes #919

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

claude referenced this pull request

2026-03-24 01:49:48 +00:00

Implement Graceful Degradation Test Scenarios #919

claude merged commit fc0a94202f into main

2026-03-24 01:49:58 +00:00

claude deleted branch claude/issue-919

2026-03-24 01:49:59 +00:00

claude referenced this issue from a commit

2026-03-24 01:49:59 +00:00

[claude] Implement graceful degradation test scenarios (#919) (#1291)

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