ds_zagres_ai/ai_service/openwebui_api.py

"""
OpenWebUI-compatible API endpoints for the AI service.
"""

from fastapi import APIRouter, Depends, HTTPException, Header, Request
from fastapi.responses import StreamingResponse
from typing import List, Dict, Any, Optional, Union
import json
import time
import uuid

from ai_service.models.model_service import model_service
from ai_service.models.chat_service import chat_service
from ai_service.models.model_parameters import ModelParameters

# Create router
router = APIRouter()

# Models endpoint
@router.get("/models", response_model=List[Dict[str, Any]])
async def get_models():
    """
    Get available models in OpenWebUI-compatible format.
    """
    models = model_service.get_available_models()
    
    # Convert to OpenWebUI format
    openwebui_models = []
    for model in models:
        openwebui_models.append({
            "id": model["id"],
            "object": "model",
            "created": int(time.time()),
            "owned_by": "user",
            "permission": [],
            "root": model["id"],
            "parent": None
        })
    
    return openwebui_models

# Chat completions endpoint (OpenAI-compatible)
@router.post("/chat/completions")
async def chat_completions(request: Request):
    """
    OpenAI-compatible chat completions endpoint.
    """
    # Parse request body
    body = await request.json()
    
    # Extract parameters
    model_id = body.get("model", "llama3.1")
    messages = body.get("messages", [])
    stream = body.get("stream", False)
    temperature = body.get("temperature")
    max_tokens = body.get("max_tokens")
    top_p = body.get("top_p")
    frequency_penalty = body.get("frequency_penalty")
    presence_penalty = body.get("presence_penalty")
    stop = body.get("stop")
    
    # Create a unique chat ID
    chat_id = str(uuid.uuid4())
    
    # Create a user ID (in a real implementation, this would come from authentication)
    user_id = "openwebui-user"
    
    # Create a new chat
    chat_service.create_chat(user_id=user_id, title="API Chat", model_id=model_id)
    
    # Extract the user's message (last user message in the array)
    user_message = None
    for msg in reversed(messages):
        if msg.get("role") == "user":
            user_message = msg.get("content")
            break
    
    if not user_message:
        raise HTTPException(status_code=400, detail="No user message found")
    
    # Get chat response
    response = chat_service.get_chat_response(
        chat_id=chat_id,
        message=user_message,
        user_id=user_id,
        temperature=temperature,
        max_tokens=max_tokens,
        top_p=top_p,
        frequency_penalty=frequency_penalty,
        presence_penalty=presence_penalty,
        stop_sequences=stop if isinstance(stop, list) else [stop] if stop else None
    )
    
    # Format response in OpenAI-compatible format
    completion_id = f"chatcmpl-{str(uuid.uuid4())[:8]}"
    
    openai_response = {
        "id": completion_id,
        "object": "chat.completion",
        "created": int(time.time()),
        "model": model_id,
        "choices": [
            {
                "index": 0,
                "message": {
                    "role": "assistant",
                    "content": response.get("content", "")
                },
                "finish_reason": "stop"
            }
        ],
        "usage": {
            "prompt_tokens": -1,  # We don't track tokens
            "completion_tokens": -1,
            "total_tokens": -1
        }
    }
    
    # Handle streaming if requested
    if stream:
        async def generate_stream():
            # Yield the response in the SSE format
            yield f"data: {json.dumps(openai_response)}\n\n"
            yield "data: [DONE]\n\n"
        
        return StreamingResponse(generate_stream(), media_type="text/event-stream")
    
    return openai_response

# Health check endpoint
@router.get("/health")
async def health_check():
    """
    Health check endpoint.
    """
    return {"status": "healthy"}

# Ollama API proxy endpoints
@router.post("/ollama/api/generate")
async def ollama_generate(request: Request):
    """
    Proxy to Ollama's generate endpoint.
    """
    # Parse request body
    body = await request.json()
    
    # Extract parameters
    model_id = body.get("model", "llama3.1")
    prompt = body.get("prompt", "")
    
    # Create a unique chat ID
    chat_id = str(uuid.uuid4())
    
    # Create a user ID (in a real implementation, this would come from authentication)
    user_id = "openwebui-user"
    
    # Create a new chat
    chat_service.create_chat(user_id=user_id, title="API Chat", model_id=model_id)
    
    # Get chat response
    response = chat_service.get_chat_response(
        chat_id=chat_id,
        message=prompt,
        user_id=user_id
    )
    
    # Format response in Ollama-compatible format
    ollama_response = {
        "model": model_id,
        "created_at": time.strftime("%Y-%m-%dT%H:%M:%S.%fZ", time.gmtime()),
        "response": response.get("content", ""),
        "done": True
    }
    
    return ollama_response