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"""
Custom exception classes for structured error handling.
"""
from typing import Optional
from fastapi import HTTPException, status
from src.schemas.error import ErrorCode
class AIProviderException(HTTPException):
"""Base exception for AI provider errors."""
def __init__(
self,
error_code: str,
detail: str,
status_code: int = status.HTTP_500_INTERNAL_SERVER_ERROR,
provider: Optional[str] = None
):
super().__init__(status_code=status_code, detail=detail)
self.error_code = error_code
self.source = "AI_PROVIDER"
self.provider = provider
class RateLimitExceededException(AIProviderException):
"""Exception raised when AI provider rate limit is exceeded."""
def __init__(self, provider: Optional[str] = None):
super().__init__(
error_code=ErrorCode.RATE_LIMIT_EXCEEDED,
detail="AI service rate limit exceeded. Please wait a moment and try again.",
status_code=status.HTTP_429_TOO_MANY_REQUESTS,
provider=provider
)
class APIKeyMissingException(AIProviderException):
"""Exception raised when API key is not configured."""
def __init__(self, provider: Optional[str] = None):
super().__init__(
error_code=ErrorCode.API_KEY_MISSING,
detail="AI service is not configured. Please add an API key.",
status_code=status.HTTP_503_SERVICE_UNAVAILABLE,
provider=provider
)
class APIKeyInvalidException(AIProviderException):
"""Exception raised when API key is invalid or expired."""
def __init__(self, provider: Optional[str] = None):
super().__init__(
error_code=ErrorCode.API_KEY_INVALID,
detail="Your API key is invalid or expired. Please check your configuration.",
status_code=status.HTTP_401_UNAUTHORIZED,
provider=provider
)
class ProviderUnavailableException(AIProviderException):
"""Exception raised when AI provider is temporarily unavailable."""
def __init__(self, provider: Optional[str] = None):
super().__init__(
error_code=ErrorCode.PROVIDER_UNAVAILABLE,
detail="AI service is temporarily unavailable. Please try again later.",
status_code=status.HTTP_503_SERVICE_UNAVAILABLE,
provider=provider
)
class ProviderErrorException(AIProviderException):
"""Exception raised for generic AI provider errors."""
def __init__(self, detail: str, provider: Optional[str] = None):
super().__init__(
error_code=ErrorCode.PROVIDER_ERROR,
detail=detail,
status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
provider=provider
)
def classify_ai_error(error: Exception, provider: Optional[str] = None) -> AIProviderException:
"""
Classify an AI provider error and return appropriate exception.
Args:
error: The original exception from the AI provider
provider: Name of the AI provider (gemini, openrouter, cohere)
Returns:
Appropriate AIProviderException subclass
"""
error_message = str(error).lower()
# Rate limit errors
if any(keyword in error_message for keyword in ["rate limit", "429", "quota exceeded", "too many requests"]):
return RateLimitExceededException(provider=provider)
# API key missing errors
if any(keyword in error_message for keyword in ["api key not found", "api key is required", "missing api key"]):
return APIKeyMissingException(provider=provider)
# API key invalid errors
if any(keyword in error_message for keyword in [
"invalid api key", "api key invalid", "unauthorized", "401",
"authentication failed", "invalid credentials", "api key expired"
]):
return APIKeyInvalidException(provider=provider)
# Provider unavailable errors
if any(keyword in error_message for keyword in [
"503", "service unavailable", "temporarily unavailable",
"connection refused", "connection timeout", "timeout"
]):
return ProviderUnavailableException(provider=provider)
# Generic provider error
return ProviderErrorException(
detail=f"AI service error: {str(error)}",
provider=provider
)
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