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Custom Exceptions and Error Handling
Issues #13, #14: Specific exception types, proper error logging
"""
import logging
from typing import Optional, Dict, Any
from fastapi import HTTPException
from datetime import datetime
import uuid
logger = logging.getLogger("tb_guard_errors")
class TBGuardException(Exception):
"""Base exception for TB-Guard-XAI"""
def __init__(
self,
message: str,
code: str,
status_code: int = 500,
details: Optional[Dict[str, Any]] = None
):
self.message = message
self.code = code
self.status_code = status_code
self.details = details or {}
self.error_id = str(uuid.uuid4())[:8]
self.timestamp = datetime.utcnow().isoformat()
super().__init__(message)
def to_http_exception(self) -> HTTPException:
"""Convert to FastAPI HTTPException"""
return HTTPException(
status_code=self.status_code,
detail={
"error": self.message,
"code": self.code,
"error_id": self.error_id,
"timestamp": self.timestamp
}
)
def log(self, exc_info=False):
"""Log the exception"""
logger.error(
f"[{self.code}] {self.message}",
extra={"error_id": self.error_id, "details": self.details},
exc_info=exc_info
)
# ============ Input Validation Errors ============
class InvalidImageError(TBGuardException):
"""Image validation failed"""
def __init__(self, reason: str, details: Optional[Dict] = None):
super().__init__(
message=f"Invalid image: {reason}",
code="INVALID_IMAGE",
status_code=400,
details=details
)
class InvalidFileError(TBGuardException):
"""File upload validation failed"""
def __init__(self, reason: str):
super().__init__(
message=f"Invalid file: {reason}",
code="INVALID_FILE",
status_code=400
)
class FileTooLargeError(TBGuardException):
"""File exceeds size limit"""
def __init__(self, file_size_mb: float, max_size_mb: int):
super().__init__(
message=f"File size {file_size_mb:.1f} MB exceeds limit of {max_size_mb} MB",
code="FILE_TOO_LARGE",
status_code=400,
details={"file_size_mb": file_size_mb, "max_size_mb": max_size_mb}
)
class InvalidInputError(TBGuardException):
"""Input validation failed (symptoms, query, etc.)"""
def __init__(self, field: str, reason: str):
super().__init__(
message=f"Invalid {field}: {reason}",
code="INVALID_INPUT",
status_code=400,
details={"field": field}
)
# ============ Model/Inference Errors ============
class ModelError(TBGuardException):
"""Model loading or inference error"""
def __init__(self, reason: str):
super().__init__(
message=f"Model error: {reason}",
code="MODEL_ERROR",
status_code=500
)
class ModelNotLoadedError(TBGuardException):
"""Model hasn't been loaded"""
def __init__(self):
super().__init__(
message="Model is not loaded. Server startup incomplete.",
code="MODEL_NOT_LOADED",
status_code=503 # Service Unavailable
)
class InferenceError(TBGuardException):
"""Inference (prediction) failed"""
def __init__(self, reason: str):
super().__init__(
message=f"Inference failed: {reason}",
code="INFERENCE_ERROR",
status_code=500
)
class OutOfDistributionError(TBGuardException):
"""Image is out-of-distribution (anomalous)"""
def __init__(self, reason: str):
super().__init__(
message=f"Image appears to be out-of-distribution: {reason}",
code="OUT_OF_DISTRIBUTION",
status_code=400
)
# ============ External Service Errors ============
class LLMError(TBGuardException):
"""LLM (Mistral) API error"""
def __init__(self, llm_name: str, reason: str):
super().__init__(
message=f"{llm_name} API error: {reason}",
code=f"{llm_name.upper()}_ERROR",
status_code=502 # Bad Gateway
)
class AudioTranscriptionError(TBGuardException):
"""Audio transcription failed"""
def __init__(self, reason: str):
super().__init__(
message=f"Audio transcription failed: {reason}",
code="TRANSCRIPTION_ERROR",
status_code=500
)
class RAGError(TBGuardException):
"""Vector database (Qdrant) error"""
def __init__(self, reason: str):
super().__init__(
message=f"Evidence retrieval failed: {reason}",
code="RAG_ERROR",
status_code=503
)
class InternetConnectivityError(TBGuardException):
"""No internet connection (for cloud APIs)"""
def __init__(self):
super().__init__(
message="No internet connection. Online mode unavailable.",
code="NO_INTERNET",
status_code=503
)
# ============ Authorization/Security Errors ============
class InvalidAPIKeyError(TBGuardException):
"""API key validation failed"""
def __init__(self, reason: str = "Invalid or expired API key"):
super().__init__(
message=reason,
code="INVALID_API_KEY",
status_code=401
)
class QuotaExceededError(TBGuardException):
"""API quota exceeded"""
def __init__(self, quota_type: str = "requests"):
super().__init__(
message=f"Daily {quota_type} quota exceeded",
code="QUOTA_EXCEEDED",
status_code=429 # Too Many Requests
)
class RateLimitError(TBGuardException):
"""Rate limit exceeded"""
def __init__(self, reset_seconds: int):
super().__init__(
message=f"Rate limit exceeded. Try again in {reset_seconds} seconds.",
code="RATE_LIMITED",
status_code=429,
details={"retry_after_seconds": reset_seconds}
)
# ============ Data/Preprocessing Errors ============
class PreprocessingError(TBGuardException):
"""Image preprocessing failed"""
def __init__(self, reason: str):
super().__init__(
message=f"Preprocessing failed: {reason}",
code="PREPROCESSING_ERROR",
status_code=400
)
class CorruptedImageError(TBGuardException):
"""Image appears corrupted"""
def __init__(self, reason: str):
super().__init__(
message=f"Image appears corrupted: {reason}",
code="CORRUPTED_IMAGE",
status_code=400
)
# ============ Configuration Errors ============
class ConfigurationError(TBGuardException):
"""Configuration validation failed (startup)"""
def __init__(self, reason: str):
super().__init__(
message=f"Configuration error: {reason}",
code="CONFIG_ERROR",
status_code=500
)
class MissingEnvironmentVariableError(ConfigurationError):
"""Required environment variable not set"""
def __init__(self, var_name: str):
super().__init__(f"Missing required environment variable: {var_name}")
# ============ Monitoring/Drift Errors ============
class PerformanceDegradationError(TBGuardException):
"""Model performance degraded (drift detected)"""
def __init__(self, accuracy_drop: float):
super().__init__(
message=f"Model performance degraded by {accuracy_drop:.1%}. Manual review required.",
code="PERFORMANCE_DEGRADATION",
status_code=503
)
# ============ Error Handler Utility ============
def handle_exception(exc: Exception) -> HTTPException:
"""
Convert any exception to appropriate HTTP response
"""
if isinstance(exc, TBGuardException):
exc.log(exc_info=True)
return exc.to_http_exception()
# Unexpected exception
error_id = str(uuid.uuid4())[:8]
logger.exception(f"Unexpected error [{error_id}]", extra={"error_id": error_id})
return HTTPException(
status_code=500,
detail={
"error": "Internal server error",
"code": "INTERNAL_ERROR",
"error_id": error_id,
"message": "An unexpected error occurred. Please contact support with the error ID."
}
)
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