Iyeoluwa Akinrinola
280 lines
8.7 KiB
Python
280 lines
8.7 KiB
Python
"""
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FastAPI application for the AI service.
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This service acts as a backend for OpenWebUI, providing OpenWebUI-compatible API endpoints.
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"""
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from fastapi import FastAPI, HTTPException
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from fastapi.middleware.cors import CORSMiddleware
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from pydantic import BaseModel, Field
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from typing import List, Optional
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from ai_service.models.model_service import model_service
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from ai_service.models.chat_service import chat_service
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from ai_service.openwebui_api import router as openwebui_router
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# Create FastAPI app
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app = FastAPI(
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title="AI Service API",
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description="Backend API for OpenWebUI",
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version="1.0.0"
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)
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# Add CORS middleware
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app.add_middleware(
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CORSMiddleware,
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allow_origins=["*"], # Allow all origins
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allow_credentials=True,
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allow_methods=["*"], # Allow all methods
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allow_headers=["*"], # Allow all headers
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)
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# Include OpenWebUI-compatible API routes
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app.include_router(openwebui_router, prefix="/api")
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# Include Ollama proxy routes
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app.include_router(openwebui_router, prefix="/ollama")
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# Define API models for health check
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class HealthResponse(BaseModel):
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"""Response model for health check."""
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status: str = Field(..., description="Health status")
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class ModelInfo(BaseModel):
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"""Model for model information."""
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id: str = Field(..., description="Model ID")
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name: str = Field(..., description="Model name")
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description: str = Field(..., description="Model description")
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provider: str = Field(..., description="Model provider")
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max_tokens: int = Field(..., description="Maximum tokens")
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is_default: bool = Field(..., description="Whether this is the default model")
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class ChatRequest(BaseModel):
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"""Request model for creating a chat."""
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user_id: str = Field(..., description="User ID")
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title: Optional[str] = Field(None, description="Chat title")
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model_id: Optional[str] = Field(None, description="Model ID")
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is_team_chat: bool = Field(False, description="Whether this is a team chat")
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class MessageRequest(BaseModel):
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"""Request model for sending a message."""
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message: str = Field(..., description="Message content")
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user_id: str = Field(..., description="User ID")
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use_rag: bool = Field(False, description="Whether to use RAG")
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# Model parameters
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temperature: Optional[float] = Field(None, description="Controls randomness: higher values mean more random completions")
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max_tokens: Optional[int] = Field(None, description="Maximum number of tokens to generate")
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top_p: Optional[float] = Field(None, description="Nucleus sampling parameter")
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frequency_penalty: Optional[float] = Field(None, description="Penalizes repeated tokens")
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presence_penalty: Optional[float] = Field(None, description="Penalizes repeated topics")
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stop_sequences: Optional[List[str]] = Field(None, description="Sequences where the API will stop generating")
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system_prompt: Optional[str] = Field(None, description="System prompt to guide the model's behavior")
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# Additional advanced parameters
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min_p: Optional[float] = Field(None, description="Minimum probability threshold for token selection")
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top_k: Optional[int] = Field(None, description="Only sample from the top k tokens")
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repeat_penalty: Optional[float] = Field(None, description="Penalty for repeating tokens")
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function_calling: Optional[bool] = Field(None, description="Whether to enable function calling")
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class Message(BaseModel):
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"""Model for a message."""
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id: str = Field(..., description="Message ID")
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content: str = Field(..., description="Message content")
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user_id: Optional[str] = Field(None, description="User ID")
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is_user_message: bool = Field(..., description="Whether this is a user message")
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timestamp: str = Field(..., description="Message timestamp")
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class Chat(BaseModel):
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"""Model for a chat."""
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id: str = Field(..., description="Chat ID")
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title: str = Field(..., description="Chat title")
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user_id: str = Field(..., description="User ID")
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model_id: str = Field(..., description="Model ID")
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is_team_chat: bool = Field(..., description="Whether this is a team chat")
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created_at: str = Field(..., description="Creation timestamp")
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updated_at: str = Field(..., description="Update timestamp")
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messages: List[Message] = Field(..., description="Chat messages")
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team_members: List[str] = Field(..., description="Team members")
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# Define API endpoints
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@app.get("/health", response_model=HealthResponse)
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async def health_check():
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"""
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Health check endpoint.
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Returns:
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Health status.
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"""
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return {"status": "healthy"}
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# Model endpoints
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@app.get("/models", response_model=List[ModelInfo])
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async def get_available_models():
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"""
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Get available models.
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Returns:
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List of model information.
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"""
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return model_service.get_available_models()
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@app.get("/models/{model_id}", response_model=ModelInfo)
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async def get_model_info(model_id: str):
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"""
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Get information about a model.
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Args:
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model_id: Model ID.
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Returns:
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Model information.
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"""
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model_info = model_service.get_model_info(model_id)
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if not model_info:
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raise HTTPException(status_code=404, detail="Model not found")
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return model_info
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# Chat endpoints
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@app.post("/chats", response_model=Chat)
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async def create_chat(request: ChatRequest):
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"""
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Create a new chat.
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Args:
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request: Chat creation request.
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Returns:
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Created chat.
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"""
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chat_id = chat_service.create_chat(
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user_id=request.user_id,
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title=request.title,
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model_id=request.model_id,
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is_team_chat=request.is_team_chat
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)
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return chat_service.get_chat(chat_id)
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@app.get("/chats/user/{user_id}", response_model=List[Chat])
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async def get_user_chats(user_id: str):
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"""
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Get all chats for a user.
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Args:
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user_id: User ID.
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Returns:
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List of chats.
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"""
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return chat_service.get_user_chats(user_id)
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@app.get("/chats/{chat_id}", response_model=Chat)
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async def get_chat(chat_id: str):
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"""
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Get a chat by ID.
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Args:
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chat_id: Chat ID.
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Returns:
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Chat information.
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"""
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chat = chat_service.get_chat(chat_id)
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if not chat:
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raise HTTPException(status_code=404, detail="Chat not found")
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return chat
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@app.post("/chats/{chat_id}/messages", response_model=Message)
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async def send_message(chat_id: str, request: MessageRequest):
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"""
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Send a message to a chat.
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Args:
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chat_id: Chat ID.
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request: Message request with optional model parameters.
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Returns:
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Bot response message.
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"""
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try:
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# Extract model parameters from the request
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response = chat_service.get_chat_response(
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chat_id=chat_id,
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message=request.message,
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user_id=request.user_id,
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use_rag=request.use_rag,
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temperature=request.temperature,
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max_tokens=request.max_tokens,
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top_p=request.top_p,
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frequency_penalty=request.frequency_penalty,
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presence_penalty=request.presence_penalty,
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stop_sequences=request.stop_sequences,
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system_prompt=request.system_prompt,
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min_p=request.min_p,
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top_k=request.top_k,
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repeat_penalty=request.repeat_penalty,
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function_calling=request.function_calling
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)
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return response
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except ValueError as e:
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raise HTTPException(status_code=404, detail=str(e))
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@app.post("/chats/{chat_id}/members/{user_id}")
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async def add_team_member(chat_id: str, user_id: str):
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"""
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Add a user to a team chat.
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Args:
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chat_id: Chat ID.
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user_id: User ID.
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Returns:
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Addition status.
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"""
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success = chat_service.add_team_member(chat_id, user_id)
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if not success:
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raise HTTPException(status_code=400, detail="Failed to add team member")
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return {"status": "success", "message": "Team member added"}
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@app.delete("/chats/{chat_id}/members/{user_id}")
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async def remove_team_member(chat_id: str, user_id: str):
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"""
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Remove a user from a team chat.
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Args:
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chat_id: Chat ID.
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user_id: User ID.
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Returns:
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Removal status.
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"""
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success = chat_service.remove_team_member(chat_id, user_id)
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if not success:
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raise HTTPException(status_code=400, detail="Failed to remove team member")
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return {"status": "success", "message": "Team member removed"}
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@app.delete("/chats/{chat_id}")
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async def delete_chat(chat_id: str):
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"""
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Delete a chat.
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Args:
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chat_id: Chat ID.
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Returns:
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Deletion status.
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"""
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success = chat_service.delete_chat(chat_id)
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if not success:
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raise HTTPException(status_code=404, detail="Chat not found")
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return {"status": "success", "message": "Chat deleted"}
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