Lukas
fecdb38a90
- Implemented ProviderHealthMonitor for real-time tracking - Monitors availability, response times, success rates - Automatic marking unavailable after failures - Background health check loop - Added ProviderFailover for automatic provider switching - Configurable retry attempts with exponential backoff - Integration with health monitoring - Smart provider selection - Created MonitoredProviderWrapper for performance tracking - Transparent monitoring for any provider - Automatic metric recording - No changes needed to existing providers - Implemented ProviderConfigManager for dynamic configuration - Runtime updates without restart - Per-provider settings (timeout, retries, bandwidth) - JSON-based persistence - Added Provider Management API (15+ endpoints) - Health monitoring endpoints - Configuration management - Failover control - Comprehensive testing (34 tests, 100% pass rate) - Health monitoring tests - Failover scenario tests - Configuration management tests - Documentation updates - Updated infrastructure.md - Updated instructions.md - Created PROVIDER_ENHANCEMENT_SUMMARY.md Total: ~2,593 lines of code, 34 passing tests
326 lines
10 KiB
Python
326 lines
10 KiB
Python
"""Provider failover system for automatic fallback on failures.
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This module implements automatic failover between multiple providers,
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ensuring high availability by switching to backup providers when the
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primary fails.
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"""
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import asyncio
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import logging
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from typing import Any, Callable, Dict, List, Optional, TypeVar
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from src.core.providers.health_monitor import get_health_monitor
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from src.core.providers.provider_config import DEFAULT_PROVIDERS
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logger = logging.getLogger(__name__)
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T = TypeVar("T")
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class ProviderFailover:
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"""Manages automatic failover between multiple providers."""
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def __init__(
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self,
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providers: Optional[List[str]] = None,
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max_retries: int = 3,
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retry_delay: float = 1.0,
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enable_health_monitoring: bool = True,
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):
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"""Initialize provider failover manager.
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Args:
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providers: List of provider names to use (default: all).
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max_retries: Maximum retry attempts per provider.
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retry_delay: Delay between retries in seconds.
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enable_health_monitoring: Whether to use health monitoring.
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"""
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self._providers = providers or DEFAULT_PROVIDERS.copy()
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self._max_retries = max_retries
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self._retry_delay = retry_delay
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self._enable_health_monitoring = enable_health_monitoring
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# Current provider index
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self._current_index = 0
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# Health monitor
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self._health_monitor = (
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get_health_monitor() if enable_health_monitoring else None
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)
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logger.info(
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f"Provider failover initialized with "
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f"{len(self._providers)} providers"
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)
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def get_current_provider(self) -> str:
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"""Get the current active provider.
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Returns:
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Name of current provider.
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"""
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if self._enable_health_monitoring and self._health_monitor:
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# Try to get best available provider
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best = self._health_monitor.get_best_provider()
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if best and best in self._providers:
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return best
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# Fall back to round-robin selection
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return self._providers[self._current_index % len(self._providers)]
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def get_next_provider(self) -> Optional[str]:
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"""Get the next provider in the failover chain.
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Returns:
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Name of next provider or None if none available.
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"""
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if self._enable_health_monitoring and self._health_monitor:
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# Get available providers
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available = [
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p
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for p in self._providers
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if p in self._health_monitor.get_available_providers()
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]
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if not available:
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logger.warning("No available providers for failover")
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return None
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# Find next available provider
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current = self.get_current_provider()
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try:
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current_idx = available.index(current)
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next_idx = (current_idx + 1) % len(available)
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return available[next_idx]
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except ValueError:
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# Current provider not in available list
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return available[0]
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# Fall back to simple rotation
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self._current_index = (self._current_index + 1) % len(
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self._providers
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)
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return self._providers[self._current_index]
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async def execute_with_failover(
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self,
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operation: Callable[[str], Any],
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operation_name: str = "operation",
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**kwargs,
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) -> Any:
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"""Execute an operation with automatic failover.
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Args:
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operation: Async callable that takes provider name.
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operation_name: Name for logging purposes.
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**kwargs: Additional arguments to pass to operation.
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Returns:
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Result from successful operation.
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Raises:
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Exception: If all providers fail.
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"""
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providers_tried = []
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last_error = None
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# Try each provider
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for attempt in range(len(self._providers)):
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provider = self.get_current_provider()
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# Skip if already tried
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if provider in providers_tried:
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self.get_next_provider()
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continue
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providers_tried.append(provider)
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# Try operation with retries
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for retry in range(self._max_retries):
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try:
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logger.info(
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f"Executing {operation_name} with provider "
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f"{provider} (attempt {retry + 1}/{self._max_retries})" # noqa: E501
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)
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# Execute operation
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import time
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start_time = time.time()
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result = await operation(provider, **kwargs)
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elapsed_ms = (time.time() - start_time) * 1000
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# Record success
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if self._health_monitor:
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self._health_monitor.record_request(
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provider_name=provider,
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success=True,
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response_time_ms=elapsed_ms,
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)
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logger.info(
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f"{operation_name} succeeded with provider "
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f"{provider} in {elapsed_ms:.2f}ms"
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)
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return result
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except Exception as e:
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last_error = e
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logger.warning(
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f"{operation_name} failed with provider "
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f"{provider} (attempt {retry + 1}): {e}"
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)
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# Record failure
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if self._health_monitor:
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import time
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elapsed_ms = (time.time() - start_time) * 1000
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self._health_monitor.record_request(
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provider_name=provider,
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success=False,
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response_time_ms=elapsed_ms,
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error_message=str(e),
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)
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# Retry with delay
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if retry < self._max_retries - 1:
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await asyncio.sleep(self._retry_delay)
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# Try next provider
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next_provider = self.get_next_provider()
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if next_provider is None:
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break
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# All providers failed
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error_msg = (
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f"{operation_name} failed with all providers. "
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f"Tried: {', '.join(providers_tried)}"
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)
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logger.error(error_msg)
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raise Exception(error_msg) from last_error
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def add_provider(self, provider_name: str) -> None:
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"""Add a provider to the failover chain.
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Args:
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provider_name: Name of provider to add.
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"""
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if provider_name not in self._providers:
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self._providers.append(provider_name)
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logger.info(f"Added provider to failover chain: {provider_name}")
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def remove_provider(self, provider_name: str) -> bool:
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"""Remove a provider from the failover chain.
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Args:
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provider_name: Name of provider to remove.
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Returns:
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True if removed, False if not found.
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"""
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if provider_name in self._providers:
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self._providers.remove(provider_name)
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logger.info(
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f"Removed provider from failover chain: {provider_name}"
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)
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return True
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return False
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def get_providers(self) -> List[str]:
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"""Get list of all providers in failover chain.
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Returns:
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List of provider names.
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"""
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return self._providers.copy()
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def set_provider_priority(
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self, provider_name: str, priority_index: int
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) -> bool:
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"""Set priority of a provider by moving it in the chain.
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Args:
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provider_name: Name of provider to prioritize.
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priority_index: New index position (0 = highest priority).
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Returns:
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True if updated, False if provider not found.
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"""
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if provider_name not in self._providers:
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return False
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self._providers.remove(provider_name)
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self._providers.insert(
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min(priority_index, len(self._providers)), provider_name
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)
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logger.info(
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f"Set provider {provider_name} priority to index {priority_index}"
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)
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return True
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def get_failover_stats(self) -> Dict[str, Any]:
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"""Get failover statistics and configuration.
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Returns:
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Dictionary with failover stats.
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"""
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stats = {
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"total_providers": len(self._providers),
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"providers": self._providers.copy(),
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"current_provider": self.get_current_provider(),
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"max_retries": self._max_retries,
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"retry_delay": self._retry_delay,
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"health_monitoring_enabled": self._enable_health_monitoring,
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}
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if self._health_monitor:
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available = self._health_monitor.get_available_providers()
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stats["available_providers"] = [
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p for p in self._providers if p in available
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]
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stats["unavailable_providers"] = [
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p for p in self._providers if p not in available
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]
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return stats
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# Global failover instance
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_failover: Optional[ProviderFailover] = None
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def get_failover() -> ProviderFailover:
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"""Get or create global provider failover instance.
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Returns:
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Global ProviderFailover instance.
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"""
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global _failover
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if _failover is None:
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_failover = ProviderFailover()
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return _failover
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def configure_failover(
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providers: Optional[List[str]] = None,
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max_retries: int = 3,
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retry_delay: float = 1.0,
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) -> ProviderFailover:
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"""Configure global provider failover instance.
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Args:
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providers: List of provider names to use.
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max_retries: Maximum retry attempts per provider.
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retry_delay: Delay between retries in seconds.
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Returns:
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Configured ProviderFailover instance.
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"""
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global _failover
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_failover = ProviderFailover(
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providers=providers,
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max_retries=max_retries,
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retry_delay=retry_delay,
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)
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return _failover
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