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import cohere
import asyncio
# Global client variable for lazy initialization
_client = None
def get_client(api_key):
"""Get or create Cohere client instance"""
global _client
if _client is None:
_client = cohere.ClientV2(api_key)
return _client
def send_message_stream(system_message, user_message, conversation_history, api_key, model_name="command-a-03-2025"):
"""Stream response from Cohere API"""
# Get or create the Cohere client
co = get_client(api_key)
# Prepare all messages including history
messages = [{"role": "system", "content": system_message}]
messages.extend(conversation_history)
messages.append({"role": "user", "content": user_message})
# Send streaming request to Cohere
stream = co.chat_stream(
model=model_name,
messages=messages
)
# Collect full response for history
full_response = ""
# Yield chunks as they come
for chunk in stream:
if chunk.type == "content-delta":
text_chunk = chunk.delta.message.content.text
full_response += text_chunk
yield text_chunk
async def send_message_stream_async(system_message, user_message, conversation_history, api_key, model_name="command-a-03-2025"):
"""Async wrapper for streaming response from Cohere API"""
def _sync_stream():
return send_message_stream(system_message, user_message, conversation_history, api_key, model_name)
# Run the synchronous generator in a thread
loop = asyncio.get_event_loop()
# Use a queue to handle the streaming data
queue = asyncio.Queue()
def _stream_worker():
try:
for chunk in _sync_stream():
loop.call_soon_threadsafe(queue.put_nowait, chunk)
except Exception as e:
loop.call_soon_threadsafe(queue.put_nowait, StopIteration(e))
else:
loop.call_soon_threadsafe(queue.put_nowait, StopIteration())
# Start the worker thread
import threading
thread = threading.Thread(target=_stream_worker)
thread.start()
# Yield chunks asynchronously
while True:
chunk = await queue.get()
if isinstance(chunk, StopIteration):
if chunk.args:
raise chunk.args[0]
break
yield chunk
def send_message(system_message, user_message, conversation_history, api_key, model_name="command-a-03-2025"):
"""Non-streaming version for backward compatibility"""
# Get or create the Cohere client
co = get_client(api_key)
# Prepare all messages including history
messages = [{"role": "system", "content": system_message}]
messages.extend(conversation_history)
messages.append({"role": "user", "content": user_message})
# Send request to Cohere synchronously
response = co.chat(
model=model_name,
messages=messages
)
# Get the response
response_content = response.message.content[0].text
return response_content
async def send_message_async(system_message, user_message, conversation_history, api_key, model_name="command-a-03-2025"):
"""Async version using asyncio.to_thread"""
return await asyncio.to_thread(
send_message,
system_message,
user_message,
conversation_history,
api_key,
model_name
) |