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import os
import time
import re
from typing import List, Optional, Dict, Any, Union, Tuple
from concurrent.futures import ThreadPoolExecutor, as_completed
from tqdm import tqdm
from dataflow.core import LLMServingABC
from dataflow.logger import get_logger
class LiteLLMServing(LLMServingABC):
"""
LiteLLM-based serving class that provides unified interface for multiple LLM providers.
Supports OpenAI, Anthropic, Cohere, Azure, AWS Bedrock, Google and many more providers.
This implementation avoids global state pollution by passing configuration parameters
directly to each litellm.completion() call, ensuring thread safety and proper isolation
between different instances. Configuration parameters are immutable after initialization.
Doc: https://docs.litellm.ai/docs/providers
"""
def __init__(self,
model: str = "gpt-4o",
key_name_of_api_key: str = "OPENAI_API_KEY",
api_base: Optional[str] = None,
api_version: Optional[str] = None,
temperature: float = 0.7,
max_tokens: int = 1024,
top_p: float = 1.0,
max_workers: int = 10,
timeout: int = 60,
**kwargs: Any):
"""
Initialize LiteLLM serving instance.
Args:
model: Model name (e.g., "gpt-4o", "claude-3-sonnet", "command-r-plus")
key_name_of_api_key: Environment variable name for API key (default: "OPENAI_API_KEY")
api_base: Custom API base URL
api_version: API version for providers that support it
temperature: Sampling temperature
max_tokens: Maximum tokens to generate
top_p: Top-p sampling parameter
max_workers: Number of concurrent workers for batch processing
timeout: Request timeout in seconds
**kwargs: Additional parameters passed to litellm.completion()
Note:
All configuration parameters are immutable after initialization.
If you need different settings, create a new instance.
"""
# Import litellm at initialization time to support lazy importing
try:
import litellm
self._litellm = litellm
except ImportError:
raise ImportError(
"litellm is not installed. Please install it with: "
"pip install open-dataflow[litellm] or pip install litellm"
)
self.model = model
self.api_base = api_base
self.api_version = api_version
self.temperature = temperature
self.max_tokens = max_tokens
self.top_p = top_p
self.max_workers = max_workers
self.timeout = timeout
self.kwargs = kwargs
self.logger = get_logger()
# Get API key from environment variable
self.api_key = os.environ.get(key_name_of_api_key)
if self.api_key is None:
error_msg = f"Lack of `{key_name_of_api_key}` in environment variables. Please set `{key_name_of_api_key}` as your api-key before using LiteLLMServing."
self.logger.error(error_msg)
raise ValueError(error_msg)
self.key_name_of_api_key = key_name_of_api_key
# Validate model by making a test call
self._validate_setup()
self.logger.info(f"LiteLLMServing initialized with model: {model}")
def switch_model(self,
model: str,
key_name_of_api_key: Optional[str] = None,
api_base: Optional[str] = None,
api_version: Optional[str] = None,
**kwargs: Any):
"""
Switch to a different model with potentially different API configuration.
Args:
model: Model name to switch to
key_name_of_api_key: New environment variable name for API key (optional)
api_base: New API base URL (optional)
api_version: New API version (optional)
**kwargs: Additional parameters for the new model
"""
# Update model
self.model = model
# Update API key if new environment variable provided
if key_name_of_api_key is not None:
self.api_key = os.environ.get(key_name_of_api_key)
if self.api_key is None:
error_msg = f"Lack of `{key_name_of_api_key}` in environment variables. Please set `{key_name_of_api_key}` as your api-key before switching model."
self.logger.error(error_msg)
raise ValueError(error_msg)
self.key_name_of_api_key = key_name_of_api_key
# Update other API configuration if provided
if api_base is not None:
self.api_base = api_base
if api_version is not None:
self.api_version = api_version
# Update other parameters from kwargs
for key, value in kwargs.items():
if hasattr(self, key):
setattr(self, key, value)
else:
self.kwargs[key] = value
# Validate the new configuration
self._validate_setup()
self.logger.success(f"Switched to model: {model}")
def format_response(self, response: Dict[str, Any]) -> str:
"""
Format LiteLLM response to include reasoning content in a structured format.
This method handles the standardized LiteLLM response format and extracts
both the main content and any reasoning_content if available.
Args:
response: The response dictionary from LiteLLM
Returns:
Formatted string with think/answer tags if reasoning is present,
otherwise just the content
"""
try:
# Extract the main content
content = response['choices'][0]['message']['content']
# Check if content already has think/answer format
if re.search(r'<think>.*</think>.*<answer>.*</answer>', content, re.DOTALL):
return content
# Try to extract reasoning_content from LiteLLM standardized format
reasoning_content = ""
try:
# LiteLLM provides reasoning_content in the message object
message = response['choices'][0]['message']
if hasattr(message, 'reasoning_content') and message.reasoning_content:
reasoning_content = message.reasoning_content
elif isinstance(message, dict) and 'reasoning_content' in message:
reasoning_content = message['reasoning_content']
except (KeyError, AttributeError):
pass
# Format the response based on whether reasoning content exists
if reasoning_content:
return f"<think>{reasoning_content}</think>\n<answer>{content}</answer>"
else:
return content
except (KeyError, IndexError) as e:
self.logger.error(f"Error formatting response: {e}")
# Return original response as string if formatting fails
return str(response)
def _validate_setup(self):
"""Validate the model and API configuration."""
try:
# Prepare completion parameters
completion_params = {
"model": self.model,
"messages": [{"role": "user", "content": "Hi"}],
"max_tokens": 1,
"timeout": self.timeout
}
# Add optional parameters if provided
if self.api_key:
completion_params["api_key"] = self.api_key
if self.api_base:
completion_params["api_base"] = self.api_base
if self.api_version:
completion_params["api_version"] = self.api_version
# Make a minimal test call to validate setup
response = self._litellm.completion(**completion_params)
self.logger.success("LiteLLM setup validation successful")
except Exception as e:
self.logger.error(f"LiteLLM setup validation failed: {e}")
raise ValueError(f"Failed to validate LiteLLM setup: {e}")
def _generate_single(self, user_input: str, system_prompt: str, retry_times: int = 3) -> str:
"""Generate response for a single input with retry logic.
Args:
user_input: User input text
system_prompt: System prompt
retry_times: Number of retry attempts for transient errors
Returns:
Generated response string
Raises:
Exception: If generation fails after all retries
"""
messages = [
{"role": "system", "content": system_prompt},
{"role": "user", "content": user_input}
]
# Prepare completion parameters
completion_params = {
"model": self.model,
"messages": messages,
"temperature": self.temperature,
"max_tokens": self.max_tokens,
"top_p": self.top_p,
"timeout": self.timeout,
**self.kwargs
}
# Add optional parameters if provided
if self.api_key:
completion_params["api_key"] = self.api_key
if self.api_base:
completion_params["api_base"] = self.api_base
if self.api_version:
completion_params["api_version"] = self.api_version
last_error = None
for attempt in range(retry_times):
try:
response = self._litellm.completion(**completion_params)
# Convert response to dict format for format_response
response_dict = response.model_dump() if hasattr(response, 'model_dump') else response.dict()
return self.format_response(response_dict)
except Exception as e:
last_error = e
if attempt < retry_times - 1:
# Check if error is retryable
error_str = str(e).lower()
if any(retryable in error_str for retryable in
["rate limit", "timeout", "connection", "503", "502", "429"]):
wait_time = min(2 ** attempt, 10) # Exponential backoff with max 10s
self.logger.warning(f"Retryable error, waiting {wait_time}s: {e}")
time.sleep(wait_time)
continue
# Non-retryable error or last attempt
self.logger.error(f"Error generating response (attempt {attempt + 1}/{retry_times}): {e}")
break
# Raise the last error instead of returning error string
raise last_error
def generate_from_input(self,
user_inputs: List[str],
system_prompt: str = "You are a helpful assistant") -> List[str]:
"""
Generate responses for a list of inputs using concurrent processing.
Args:
user_inputs: List of user input strings
system_prompt: System prompt to use for all generations
Returns:
List of generated responses
"""
if not user_inputs:
return []
# Single input case
if len(user_inputs) == 1:
try:
return [self._generate_single(user_inputs[0], system_prompt)]
except Exception as e:
# For consistency with batch processing, return error message in list
error_msg = f"Error: {str(e)}"
self.logger.error(f"Failed to generate response: {e}")
return [error_msg]
# Batch processing with threading
responses = [None] * len(user_inputs)
def generate_with_index(idx: int, user_input: str) -> Tuple[int, str]:
try:
response = self._generate_single(user_input, system_prompt)
return idx, response
except Exception as e:
# For batch processing, return error message to maintain list structure
error_msg = f"Error: {str(e)}"
self.logger.error(f"Failed to generate response for input {idx}: {e}")
return idx, error_msg
with ThreadPoolExecutor(max_workers=self.max_workers) as executor:
futures = [
executor.submit(generate_with_index, idx, user_input)
for idx, user_input in enumerate(user_inputs)
]
for future in tqdm(as_completed(futures), total=len(futures), desc="Generating"):
idx, response = future.result()
responses[idx] = response
return responses
def generate_embedding_from_input(self, texts: List[str]) -> List[List[float]]:
"""
Generate embeddings for a list of texts.
Args:
texts: List of text strings to embed
Returns:
List of embedding vectors
"""
if not texts:
return []
embeddings = []
# Prepare embedding parameters
embedding_params = {
"model": self.model,
"timeout": self.timeout
}
# Add optional parameters if provided
if self.api_key:
embedding_params["api_key"] = self.api_key
if self.api_base:
embedding_params["api_base"] = self.api_base
if self.api_version:
embedding_params["api_version"] = self.api_version
# Process embeddings with retry logic
def embed_with_retry(text: str, retry_times: int = 3):
last_error = None
for attempt in range(retry_times):
try:
response = self._litellm.embedding(
input=[text],
**embedding_params
)
return response['data'][0]['embedding']
except Exception as e:
last_error = e
if attempt < retry_times - 1:
error_str = str(e).lower()
if any(retryable in error_str for retryable in
["rate limit", "timeout", "connection", "503", "502", "429"]):
wait_time = min(2 ** attempt, 10)
self.logger.warning(f"Retryable error in embedding, waiting {wait_time}s: {e}")
time.sleep(wait_time)
continue
self.logger.error(f"Error generating embedding (attempt {attempt + 1}/{retry_times}): {e}")
break
raise last_error
# Process in batches for better performance
with ThreadPoolExecutor(max_workers=self.max_workers) as executor:
futures = [executor.submit(embed_with_retry, text) for text in texts]
for future in tqdm(as_completed(futures), total=len(futures), desc="Generating embeddings"):
try:
embedding = future.result()
embeddings.append(embedding)
except Exception as e:
self.logger.error(f"Failed to generate embedding: {e}")
# Return empty embedding for failed cases to maintain list structure
embeddings.append([])
return embeddings
def get_supported_models(self) -> List[str]:
"""Get list of supported models for the current provider."""
try:
return self._litellm.model_list
except Exception as e:
self.logger.warning(f"Could not retrieve model list: {e}")
return []
def cleanup(self) -> None:
"""Cleanup resources."""
self.logger.info("Cleaning up LiteLLMServing resources")
# LiteLLM doesn't require explicit cleanup since we don't use global state
# Instance variables will be garbage collected when the instance is destroyed
# Clear any references to ensure proper cleanup
self.api_key = None
self.kwargs = None
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