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"""
Custom exceptions for LLM client operations.
Provides a hierarchy of structured exceptions for better error handling
and debugging across different LLM providers.
"""
class LLMClientError(Exception):
"""Base exception for all LLM client errors."""
def __init__(
self,
message: str,
provider: str = "unknown",
status_code: int | None = None,
retry_after: float | None = None,
):
self.message = message
self.provider = provider
self.status_code = status_code
self.retry_after = retry_after
super().__init__(self.message)
def __str__(self) -> str:
parts = [f"[{self.provider}] {self.message}"]
if self.status_code:
parts.append(f"(status: {self.status_code})")
return " ".join(parts)
class LLMAuthenticationError(LLMClientError):
"""Authentication failed - invalid or missing API key."""
def __init__(self, provider: str, message: str = "Authentication failed"):
super().__init__(
message=message,
provider=provider,
status_code=401,
)
class LLMRateLimitError(LLMClientError):
"""Rate limit exceeded - too many requests."""
def __init__(
self,
provider: str,
retry_after: float | None = None,
message: str = "Rate limit exceeded",
):
super().__init__(
message=message,
provider=provider,
status_code=429,
retry_after=retry_after,
)
class LLMQuotaExceededError(LLMClientError):
"""Quota or credits exhausted."""
def __init__(self, provider: str, message: str = "Quota exceeded"):
super().__init__(
message=message,
provider=provider,
status_code=402,
)
class LLMModelNotFoundError(LLMClientError):
"""Requested model not available."""
def __init__(self, provider: str, model: str):
super().__init__(
message=f"Model '{model}' not found or not available",
provider=provider,
status_code=404,
)
class LLMContextLengthError(LLMClientError):
"""Input exceeds model's context window."""
def __init__(
self,
provider: str,
token_count: int | None = None,
max_tokens: int | None = None,
):
message = "Context length exceeded"
if token_count and max_tokens:
message = f"Context length exceeded: {token_count} tokens provided, max is {max_tokens}"
super().__init__(
message=message,
provider=provider,
status_code=400,
)
class LLMInvalidRequestError(LLMClientError):
"""Invalid request parameters."""
def __init__(self, provider: str, message: str = "Invalid request parameters"):
super().__init__(
message=message,
provider=provider,
status_code=400,
)
class LLMTimeoutError(LLMClientError):
"""Request timed out."""
def __init__(self, provider: str, timeout: float):
super().__init__(
message=f"Request timed out after {timeout}s",
provider=provider,
status_code=408,
)
class LLMConnectionError(LLMClientError):
"""Failed to connect to the API endpoint."""
def __init__(self, provider: str, url: str | None = None):
message = "Failed to connect to API"
if url:
message = f"Failed to connect to {url}"
super().__init__(
message=message,
provider=provider,
)
class LLMServerError(LLMClientError):
"""Server-side error from the LLM provider."""
def __init__(
self,
provider: str,
status_code: int = 500,
message: str = "Server error",
):
super().__init__(
message=message,
provider=provider,
status_code=status_code,
)
class LLMResponseParseError(LLMClientError):
"""Failed to parse response from LLM provider."""
def __init__(self, provider: str, raw_response: str | None = None):
message = "Failed to parse response"
if raw_response:
preview = raw_response[:200] + "..." if len(raw_response) > 200 else raw_response
message = f"Failed to parse response: {preview}"
super().__init__(
message=message,
provider=provider,
)
class LLMStreamError(LLMClientError):
"""Error during streaming response."""
def __init__(self, provider: str, message: str = "Stream interrupted"):
super().__init__(
message=message,
provider=provider,
)
class LLMContentFilterError(LLMClientError):
"""Content blocked by safety filters."""
def __init__(self, provider: str, reason: str | None = None):
message = "Content blocked by safety filters"
if reason:
message = f"Content blocked: {reason}"
super().__init__(
message=message,
provider=provider,
status_code=400,
)
class CircuitBreakerOpenError(LLMClientError):
"""Circuit breaker is open, requests are being blocked."""
def __init__(
self,
provider: str,
failure_count: int,
reset_time: float,
):
super().__init__(
message=f"Circuit breaker open after {failure_count} failures. Resets in {reset_time:.1f}s",
provider=provider,
)
self.failure_count = failure_count
self.reset_time = reset_time
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