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# Copyright 2025 Google LLC
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import logging
import requests
import config
logger = logging.getLogger(__name__)
_api_key = None
_endpoint_url = None
_initialized = False
def init_llm_client():
"""Initializes LLM client configuration by loading from config."""
global _api_key, _endpoint_url, _initialized
if config.HF_TOKEN and config.MEDGEMMA_ENDPOINT_URL:
_api_key = config.HF_TOKEN
_endpoint_url = config.MEDGEMMA_ENDPOINT_URL
_initialized = True
logger.info("LLM client configured successfully.")
else:
_api_key = None
_endpoint_url = None
logger.error("LLM client could not be configured due to missing API key or endpoint URL.")
def is_initialized():
return _initialized
def make_chat_completion_request(
model: str,
messages: list,
temperature: float,
max_tokens: int,
stream: bool,
top_p: float | None = None,
seed: int | None = None,
stop: list[str] | str | None = None,
frequency_penalty: float | None = None,
presence_penalty: float | None = None
):
"""
Makes a chat completion request to the configured LLM API.
"""
if not _initialized:
logger.error("LLM client not initialized.")
raise RuntimeError("LLM client not initialized.")
headers = {
"Authorization": f"Bearer {_api_key}",
"Content-Type": "application/json",
}
payload = {
"model": model,
"messages": messages,
"temperature": temperature,
"max_tokens": max_tokens,
"stream": stream,
}
if top_p is not None: payload["top_p"] = top_p
if seed is not None: payload["seed"] = seed
if stop is not None: payload["stop"] = stop
if frequency_penalty is not None: payload["frequency_penalty"] = frequency_penalty
if presence_penalty is not None: payload["presence_penalty"] = presence_penalty
temp_url = _endpoint_url.rstrip('/')
if temp_url.endswith("/v1/chat/completions"):
full_url = temp_url
elif temp_url.endswith("/v1"):
full_url = temp_url + "/chat/completions"
else:
full_url = temp_url + "/v1/chat/completions"
response = requests.post(full_url, headers=headers, json=payload, stream=stream, timeout=60)
response.raise_for_status()
return response |