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"""Error recovery and fallback mechanisms."""
import logging
import time
from typing import Dict, List, Optional, Any, Callable, TypeVar, Union
from dataclasses import dataclass
from enum import Enum
from functools import wraps
from .structured_logger import StructuredLogger, LogContext, get_structured_logger
from ...domain.exceptions import (
DomainException,
SpeechRecognitionException,
TranslationFailedException,
SpeechSynthesisException,
AudioProcessingException
)
logger = get_structured_logger(__name__)
T = TypeVar('T')
class RecoveryStrategy(Enum):
"""Recovery strategy types."""
RETRY = "retry"
FALLBACK = "fallback"
CIRCUIT_BREAKER = "circuit_breaker"
GRACEFUL_DEGRADATION = "graceful_degradation"
class CircuitBreakerState(Enum):
"""Circuit breaker states."""
CLOSED = "closed"
OPEN = "open"
HALF_OPEN = "half_open"
@dataclass
class RetryConfig:
"""Retry configuration."""
max_attempts: int = 3
base_delay: float = 1.0
max_delay: float = 60.0
exponential_backoff: bool = True
jitter: bool = True
retryable_exceptions: Optional[List[type]] = None
@dataclass
class CircuitBreakerConfig:
"""Circuit breaker configuration."""
failure_threshold: int = 5
recovery_timeout: float = 60.0
success_threshold: int = 2
timeout: float = 30.0
@dataclass
class FallbackConfig:
"""Fallback configuration."""
fallback_providers: List[str]
fallback_function: Optional[Callable] = None
enable_graceful_degradation: bool = True
class CircuitBreaker:
"""Circuit breaker implementation."""
def __init__(self, config: CircuitBreakerConfig, name: str = "default"):
"""
Initialize circuit breaker.
Args:
config: Circuit breaker configuration
name: Circuit breaker name
"""
self.config = config
self.name = name
self.state = CircuitBreakerState.CLOSED
self.failure_count = 0
self.success_count = 0
self.last_failure_time = 0.0
self.logger = get_structured_logger(f"{__name__}.CircuitBreaker.{name}")
def call(self, func: Callable[..., T], *args, **kwargs) -> T:
"""
Call function through circuit breaker.
Args:
func: Function to call
*args: Function arguments
**kwargs: Function keyword arguments
Returns:
T: Function result
Raises:
Exception: If circuit is open or function fails
"""
context = LogContext(
correlation_id=kwargs.get('correlation_id', 'unknown'),
component=f"circuit_breaker_{self.name}",
operation=func.__name__
)
if self.state == CircuitBreakerState.OPEN:
if time.time() - self.last_failure_time < self.config.recovery_timeout:
self.logger.warning(
f"Circuit breaker {self.name} is OPEN, rejecting call",
context=context
)
raise AudioProcessingException(f"Circuit breaker {self.name} is open")
else:
self.state = CircuitBreakerState.HALF_OPEN
self.success_count = 0
self.logger.info(
f"Circuit breaker {self.name} transitioning to HALF_OPEN",
context=context
)
try:
result = func(*args, **kwargs)
self._on_success(context)
return result
except Exception as e:
self._on_failure(e, context)
raise
def _on_success(self, context: LogContext) -> None:
"""Handle successful call."""
if self.state == CircuitBreakerState.HALF_OPEN:
self.success_count += 1
if self.success_count >= self.config.success_threshold:
self.state = CircuitBreakerState.CLOSED
self.failure_count = 0
self.logger.info(
f"Circuit breaker {self.name} transitioning to CLOSED",
context=context
)
elif self.state == CircuitBreakerState.CLOSED:
self.failure_count = 0
def _on_failure(self, exception: Exception, context: LogContext) -> None:
"""Handle failed call."""
self.failure_count += 1
self.last_failure_time = time.time()
if self.state == CircuitBreakerState.HALF_OPEN:
self.state = CircuitBreakerState.OPEN
self.logger.warning(
f"Circuit breaker {self.name} transitioning to OPEN after failure in HALF_OPEN",
context=context
)
elif (self.state == CircuitBreakerState.CLOSED and
self.failure_count >= self.config.failure_threshold):
self.state = CircuitBreakerState.OPEN
self.logger.warning(
f"Circuit breaker {self.name} transitioning to OPEN after {self.failure_count} failures",
context=context
)
class RecoveryManager:
"""Manages error recovery and fallback mechanisms."""
def __init__(self):
"""Initialize recovery manager."""
self.circuit_breakers: Dict[str, CircuitBreaker] = {}
self.logger = get_structured_logger(__name__)
# Default retry configurations for different exception types
self.default_retry_configs = {
SpeechRecognitionException: RetryConfig(
max_attempts=2,
base_delay=2.0,
retryable_exceptions=[SpeechRecognitionException]
),
TranslationFailedException: RetryConfig(
max_attempts=3,
base_delay=1.0,
retryable_exceptions=[TranslationFailedException]
),
SpeechSynthesisException: RetryConfig(
max_attempts=2,
base_delay=1.5,
retryable_exceptions=[SpeechSynthesisException]
),
ConnectionError: RetryConfig(
max_attempts=3,
base_delay=2.0,
exponential_backoff=True,
retryable_exceptions=[ConnectionError, TimeoutError]
)
}
def get_circuit_breaker(self, name: str, config: Optional[CircuitBreakerConfig] = None) -> CircuitBreaker:
"""
Get or create circuit breaker.
Args:
name: Circuit breaker name
config: Optional configuration
Returns:
CircuitBreaker: Circuit breaker instance
"""
if name not in self.circuit_breakers:
if config is None:
config = CircuitBreakerConfig()
self.circuit_breakers[name] = CircuitBreaker(config, name)
return self.circuit_breakers[name]
def retry_with_backoff(self, func: Callable[..., T],
config: Optional[RetryConfig] = None,
correlation_id: Optional[str] = None,
*args, **kwargs) -> T:
"""
Execute function with retry and exponential backoff.
Args:
func: Function to execute
config: Retry configuration
correlation_id: Correlation ID for logging
*args: Function arguments
**kwargs: Function keyword arguments
Returns:
T: Function result
Raises:
Exception: If all retry attempts fail
"""
if config is None:
config = RetryConfig()
context = LogContext(
correlation_id=correlation_id or 'unknown',
component='retry_manager',
operation=func.__name__
)
last_exception = None
for attempt in range(config.max_attempts):
try:
if attempt > 0:
delay = self._calculate_delay(attempt, config)
self.logger.info(
f"Retrying {func.__name__} (attempt {attempt + 1}/{config.max_attempts}) after {delay:.2f}s delay",
context=context
)
time.sleep(delay)
result = func(*args, **kwargs)
if attempt > 0:
self.logger.info(
f"Retry successful for {func.__name__} on attempt {attempt + 1}",
context=context
)
return result
except Exception as e:
last_exception = e
# Check if exception is retryable
if not self._is_retryable_exception(e, config):
self.logger.error(
f"Non-retryable exception in {func.__name__}: {type(e).__name__}",
context=context,
exception=e
)
raise
self.logger.warning(
f"Attempt {attempt + 1}/{config.max_attempts} failed for {func.__name__}: {e}",
context=context
)
# All attempts failed
self.logger.error(
f"All {config.max_attempts} retry attempts failed for {func.__name__}",
context=context,
exception=last_exception
)
raise last_exception
def execute_with_fallback(self, primary_func: Callable[..., T],
fallback_funcs: List[Callable[..., T]],
correlation_id: Optional[str] = None,
*args, **kwargs) -> T:
"""
Execute function with fallback options.
Args:
primary_func: Primary function to execute
fallback_funcs: List of fallback functions
correlation_id: Correlation ID for logging
*args: Function arguments
**kwargs: Function keyword arguments
Returns:
T: Function result
Raises:
Exception: If all functions fail
"""
context = LogContext(
correlation_id=correlation_id or 'unknown',
component='fallback_manager',
operation=primary_func.__name__
)
# Try primary function first
try:
result = primary_func(*args, **kwargs)
return result
except Exception as e:
self.logger.warning(
f"Primary function {primary_func.__name__} failed, trying fallbacks",
context=context
)
last_exception = e
# Try fallback functions
for i, fallback_func in enumerate(fallback_funcs):
try:
self.logger.info(
f"Trying fallback {i + 1}/{len(fallback_funcs)}: {fallback_func.__name__}",
context=context
)
result = fallback_func(*args, **kwargs)
self.logger.info(
f"Fallback {fallback_func.__name__} succeeded",
context=context
)
return result
except Exception as fallback_e:
last_exception = fallback_e
self.logger.warning(
f"Fallback {fallback_func.__name__} failed: {fallback_e}",
context=context
)
# All functions failed
self.logger.error(
f"All functions failed (primary + {len(fallback_funcs)} fallbacks)",
context=context,
exception=last_exception
)
raise last_exception
def execute_with_circuit_breaker(self, func: Callable[..., T],
circuit_breaker_name: str,
config: Optional[CircuitBreakerConfig] = None,
correlation_id: Optional[str] = None,
*args, **kwargs) -> T:
"""
Execute function with circuit breaker protection.
Args:
func: Function to execute
circuit_breaker_name: Circuit breaker name
config: Optional circuit breaker configuration
correlation_id: Correlation ID for logging
*args: Function arguments
**kwargs: Function keyword arguments
Returns:
T: Function result
Raises:
Exception: If circuit is open or function fails
"""
circuit_breaker = self.get_circuit_breaker(circuit_breaker_name, config)
# Add correlation ID to kwargs for circuit breaker logging
if correlation_id:
kwargs['correlation_id'] = correlation_id
return circuit_breaker.call(func, *args, **kwargs)
def _calculate_delay(self, attempt: int, config: RetryConfig) -> float:
"""
Calculate retry delay with exponential backoff and jitter.
Args:
attempt: Attempt number (0-based)
config: Retry configuration
Returns:
float: Delay in seconds
"""
if config.exponential_backoff:
delay = config.base_delay * (2 ** attempt)
else:
delay = config.base_delay
# Apply maximum delay limit
delay = min(delay, config.max_delay)
# Add jitter to prevent thundering herd
if config.jitter:
import random
delay *= (0.5 + random.random() * 0.5)
return delay
def _is_retryable_exception(self, exception: Exception, config: RetryConfig) -> bool:
"""
Check if exception is retryable.
Args:
exception: Exception to check
config: Retry configuration
Returns:
bool: True if exception is retryable
"""
if config.retryable_exceptions is None:
# Default retryable exceptions
retryable_types = (
ConnectionError,
TimeoutError,
SpeechRecognitionException,
TranslationFailedException,
SpeechSynthesisException
)
return isinstance(exception, retryable_types)
return any(isinstance(exception, exc_type) for exc_type in config.retryable_exceptions)
def get_retry_config_for_exception(self, exception: Exception) -> RetryConfig:
"""
Get appropriate retry configuration for exception type.
Args:
exception: Exception to get config for
Returns:
RetryConfig: Retry configuration
"""
for exc_type, config in self.default_retry_configs.items():
if isinstance(exception, exc_type):
return config
# Return default config
return RetryConfig()
def with_retry(config: Optional[RetryConfig] = None):
"""
Decorator for automatic retry with backoff.
Args:
config: Optional retry configuration
Returns:
Decorated function
"""
def decorator(func: Callable[..., T]) -> Callable[..., T]:
@wraps(func)
def wrapper(*args, **kwargs) -> T:
recovery_manager = RecoveryManager()
correlation_id = kwargs.get('correlation_id')
return recovery_manager.retry_with_backoff(
func, config, correlation_id, *args, **kwargs
)
return wrapper
return decorator
def with_circuit_breaker(name: str, config: Optional[CircuitBreakerConfig] = None):
"""
Decorator for circuit breaker protection.
Args:
name: Circuit breaker name
config: Optional circuit breaker configuration
Returns:
Decorated function
"""
def decorator(func: Callable[..., T]) -> Callable[..., T]:
@wraps(func)
def wrapper(*args, **kwargs) -> T:
recovery_manager = RecoveryManager()
correlation_id = kwargs.get('correlation_id')
return recovery_manager.execute_with_circuit_breaker(
func, name, config, correlation_id, *args, **kwargs
)
return wrapper
return decorator |