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[loop-generated] [reliability] Implement Circuit Breaker Pattern for External Dependencies #1439

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opened 2026-03-24 14:53:40 +00:00 by Timmy · 1 comment
Timmy commented 2026-03-24 14:53:40 +00:00
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Problem:
The system lacks circuit breaker patterns for external dependencies, leading to cascading failures when external services (Gitea, LLM APIs, databases) become unavailable.

Current Risks:

  • Agent loops hang indefinitely on external service failures
  • No automatic degradation when dependencies are unavailable
  • Retry storms can overwhelm recovering services
  • No visibility into dependency health status

Proposed Solution:
Implement circuit breaker pattern with three states: CLOSED (normal), OPEN (failing), HALF_OPEN (testing recovery).

Implementation Areas:

  1. Gitea API Client: Circuit breaker for repository operations
  2. LLM Provider Routing: Graceful fallback when providers fail
  3. Database Operations: Circuit breaker for database queries
  4. Dashboard Services: Resilient service-to-service communication

Technical Implementation:

class CircuitBreaker:
    def __init__(self, failure_threshold=5, recovery_timeout=60):
        self.failure_threshold = failure_threshold
        self.recovery_timeout = recovery_timeout
        self.failure_count = 0
        self.state = CircuitState.CLOSED
        self.last_failure_time = None
    
    async def call(self, func, *args, **kwargs):
        if self.state == CircuitState.OPEN:
            if self._should_attempt_reset():
                self.state = CircuitState.HALF_OPEN
            else:
                raise CircuitBreakerOpenException()
        
        try:
            result = await func(*args, **kwargs)
            self._on_success()
            return result
        except Exception as e:
            self._on_failure(e)
            raise

Benefits:

  • Prevent cascading failures across agent loops
  • Faster recovery detection and automatic retry
  • Better observability of system health
  • Graceful degradation instead of hard failures

Files to Modify:

  • src/infrastructure/resilience/ (new package)
  • src/infrastructure/api/gitea_client.py
  • src/infrastructure/router/cascade.py
  • src/dashboard/services/
  • All agent loop scripts

Success Metrics:

  • Agent loops continue operating during transient failures
  • 90%+ reduction in timeout-based failures
  • Automatic recovery within 60s of service restoration
  • Zero retry storms during service outages

Priority: HIGH - System reliability and resilience

Acceptance Criteria:

  • Circuit breakers implemented for all external dependencies
  • Configurable failure thresholds and recovery timeouts
  • Dashboard showing circuit breaker status
  • Graceful degradation modes for each service
  • Comprehensive logging of circuit breaker events
  • Load testing validates resilience improvements
**Problem:** The system lacks circuit breaker patterns for external dependencies, leading to cascading failures when external services (Gitea, LLM APIs, databases) become unavailable. **Current Risks:** - Agent loops hang indefinitely on external service failures - No automatic degradation when dependencies are unavailable - Retry storms can overwhelm recovering services - No visibility into dependency health status **Proposed Solution:** Implement circuit breaker pattern with three states: CLOSED (normal), OPEN (failing), HALF_OPEN (testing recovery). **Implementation Areas:** 1. **Gitea API Client**: Circuit breaker for repository operations 2. **LLM Provider Routing**: Graceful fallback when providers fail 3. **Database Operations**: Circuit breaker for database queries 4. **Dashboard Services**: Resilient service-to-service communication **Technical Implementation:** ```python class CircuitBreaker: def __init__(self, failure_threshold=5, recovery_timeout=60): self.failure_threshold = failure_threshold self.recovery_timeout = recovery_timeout self.failure_count = 0 self.state = CircuitState.CLOSED self.last_failure_time = None async def call(self, func, *args, **kwargs): if self.state == CircuitState.OPEN: if self._should_attempt_reset(): self.state = CircuitState.HALF_OPEN else: raise CircuitBreakerOpenException() try: result = await func(*args, **kwargs) self._on_success() return result except Exception as e: self._on_failure(e) raise ``` **Benefits:** - Prevent cascading failures across agent loops - Faster recovery detection and automatic retry - Better observability of system health - Graceful degradation instead of hard failures **Files to Modify:** - `src/infrastructure/resilience/` (new package) - `src/infrastructure/api/gitea_client.py` - `src/infrastructure/router/cascade.py` - `src/dashboard/services/` - All agent loop scripts **Success Metrics:** - Agent loops continue operating during transient failures - 90%+ reduction in timeout-based failures - Automatic recovery within 60s of service restoration - Zero retry storms during service outages **Priority:** HIGH - System reliability and resilience **Acceptance Criteria:** - [ ] Circuit breakers implemented for all external dependencies - [ ] Configurable failure thresholds and recovery timeouts - [ ] Dashboard showing circuit breaker status - [ ] Graceful degradation modes for each service - [ ] Comprehensive logging of circuit breaker events - [ ] Load testing validates resilience improvements
Timmy commented 2026-03-24 15:06:10 +00:00
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KIMI IMPLEMENTATION INSTRUCTIONS:

This is a critical reliability improvement. Implement circuit breaker pattern to prevent cascading failures.

FILES TO CREATE:

src/infrastructure/resilience/__init__.py
src/infrastructure/resilience/circuit_breaker.py
src/infrastructure/resilience/exceptions.py
src/infrastructure/resilience/metrics.py

STEP-BY-STEP IMPLEMENTATION:

  1. Create Circuit Breaker Core (src/infrastructure/resilience/circuit_breaker.py):

    • Implement CircuitBreaker class with CLOSED/OPEN/HALF_OPEN states
    • Add configurable failure_threshold (default: 5) and recovery_timeout (default: 60s)
    • Include async call() method with proper exception handling
    • Add _should_attempt_reset() and state transition logic

  2. Create Custom Exceptions (src/infrastructure/resilience/exceptions.py):

    • CircuitBreakerOpenException
    • CircuitBreakerHalfOpenException
    • ServiceUnavailableException

  3. Integrate with Gitea Client (src/infrastructure/api/gitea_client.py):

    • Wrap all API calls with circuit breaker
    • Add graceful degradation for non-critical operations
    • Preserve existing error handling

  4. Test Integration (tests/infrastructure/test_circuit_breaker.py):

    • Test all three states and transitions
    • Test failure threshold and recovery timeout
    • Test integration with existing services

VERIFICATION:

  • Run tox -e unit - all tests must pass
  • Circuit breaker should handle 5 consecutive failures then open
  • After 60s, should attempt half-open state
  • Services should degrade gracefully, not crash

CRITICAL: This affects system reliability. Preserve all existing functionality while adding resilience.

PROCEED WITH IMPLEMENTATION.

**KIMI IMPLEMENTATION INSTRUCTIONS:** This is a critical reliability improvement. Implement circuit breaker pattern to prevent cascading failures. **FILES TO CREATE:** ``` src/infrastructure/resilience/__init__.py src/infrastructure/resilience/circuit_breaker.py src/infrastructure/resilience/exceptions.py src/infrastructure/resilience/metrics.py ``` **STEP-BY-STEP IMPLEMENTATION:** 1. **Create Circuit Breaker Core** (`src/infrastructure/resilience/circuit_breaker.py`): - Implement CircuitBreaker class with CLOSED/OPEN/HALF_OPEN states - Add configurable failure_threshold (default: 5) and recovery_timeout (default: 60s) - Include async call() method with proper exception handling - Add _should_attempt_reset() and state transition logic 2. **Create Custom Exceptions** (`src/infrastructure/resilience/exceptions.py`): - CircuitBreakerOpenException - CircuitBreakerHalfOpenException - ServiceUnavailableException 3. **Integrate with Gitea Client** (`src/infrastructure/api/gitea_client.py`): - Wrap all API calls with circuit breaker - Add graceful degradation for non-critical operations - Preserve existing error handling 4. **Test Integration** (`tests/infrastructure/test_circuit_breaker.py`): - Test all three states and transitions - Test failure threshold and recovery timeout - Test integration with existing services **VERIFICATION:** - Run `tox -e unit` - all tests must pass - Circuit breaker should handle 5 consecutive failures then open - After 60s, should attempt half-open state - Services should degrade gracefully, not crash **CRITICAL:** This affects system reliability. Preserve all existing functionality while adding resilience. PROCEED WITH IMPLEMENTATION.
kimi was assigned by Timmy 2026-03-24 15:06:16 +00:00
kimi was unassigned by Timmy 2026-03-24 19:32:09 +00:00
Timmy closed this issue 2026-03-24 21:54:02 +00:00
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Reference: Rockachopa/Timmy-time-dashboard#1439
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