api/utils.py

# api/utils.py

from datetime import datetime
import json
from typing import Any, Dict, Optional

import httpx
from api.config import (
    MODEL_MAPPING,
    headers,
    AGENT_MODE,
    TRENDING_AGENT_MODE,
    BASE_URL,
    MODEL_PREFIXES,
    MODEL_REFERERS
)
from fastapi import HTTPException
from api.models import ChatRequest

from api.logger import setup_logger

import uuid  # Added import for uuid

logger = setup_logger(__name__)

def create_chat_completion_data(
    content: str, model: str, timestamp: int, finish_reason: Optional[str] = None
) -> Dict[str, Any]:
    return {
        "id": f"chatcmpl-{uuid.uuid4()}",
        "object": "chat.completion.chunk",
        "created": timestamp,
        "model": model,
        "choices": [
            {
                "index": 0,
                "delta": {"content": content, "role": "assistant"},
                "finish_reason": finish_reason,
            }
        ],
        "usage": None,
    }

def message_to_dict(message, model_prefix: Optional[str] = None):
    if isinstance(message.content, str):
        content = message.content
        if model_prefix:
            content = f"{model_prefix} {content}"
        return {"role": message.role, "content": content}
    elif isinstance(message.content, list) and len(message.content) == 2:
        content = message.content[0]["text"]
        if model_prefix:
            content = f"{model_prefix} {content}"
        return {
            "role": message.role,
            "content": content,
            "data": {
                "imageBase64": message.content[1]["image_url"]["url"],
                "fileText": "",
                "title": "snapshot",
            },
        }
    else:
        return {"role": message.role, "content": message.content}

def strip_model_prefix(content: str, model_prefix: str) -> str:
    """Remove the model prefix and language specifier from the response content if present."""
    # Remove the model prefix
    if content.startswith(model_prefix):
        content = content[len(model_prefix):].strip()
    
    # Remove language specifier from code blocks (e.g., ```html -> ```)
    if content.startswith("```"):
        first_newline = content.find("\n")
        if first_newline != -1:
            # Retain the triple backticks and the content after the language specifier
            content = "```\n" + content[first_newline + 1:]
    
    return content

async def process_streaming_response(request: ChatRequest):
    agent_mode = AGENT_MODE.get(request.model, {})
    trending_agent_mode = TRENDING_AGENT_MODE.get(request.model, {})
    model_prefix = MODEL_PREFIXES.get(request.model, "")
    referer_path = MODEL_REFERERS.get(request.model, f"/?model={request.model}")
    referer_url = f"{BASE_URL}{referer_path}"

    # Update headers with dynamic Referer
    dynamic_headers = headers.copy()
    dynamic_headers['Referer'] = referer_url

    json_data = {
        "messages": [message_to_dict(msg, model_prefix=model_prefix) for msg in request.messages],
        "previewToken": None,
        "userId": None,
        "codeModelMode": True,
        "agentMode": agent_mode,
        "trendingAgentMode": trending_agent_mode,
        "isMicMode": False,
        "userSystemPrompt": None,
        "maxTokens": request.max_tokens,
        "playgroundTopP": request.top_p,
        "playgroundTemperature": request.temperature,
        "isChromeExt": False,
        "githubToken": None,
        "clickedAnswer2": False,
        "clickedAnswer3": False,
        "clickedForceWebSearch": False,
        "visitFromDelta": False,
        "mobileClient": False,
        "userSelectedModel": MODEL_MAPPING.get(request.model, request.model),
    }

    async with httpx.AsyncClient() as client:
        try:
            async with client.stream(
                "POST",
                f"{BASE_URL}/api/chat",
                headers=dynamic_headers,
                json=json_data,
                timeout=100,
            ) as response:
                response.raise_for_status()
                async for line in response.aiter_lines():
                    timestamp = int(datetime.now().timestamp())
                    if line:
                        content = line
                        if content.startswith("$@$v=undefined-rv1$@$"):
                            content = content[21:]
                        # Strip the model prefix and handle code blocks
                        cleaned_content = strip_model_prefix(content, model_prefix)
                        yield f"data: {json.dumps(create_chat_completion_data(cleaned_content, request.model, timestamp))}\n\n"

                yield f"data: {json.dumps(create_chat_completion_data('', request.model, timestamp, 'stop'))}\n\n"
                yield "data: [DONE]\n\n"
        except httpx.HTTPStatusError as e:
            logger.error(f"HTTP error occurred: {e}")
            raise HTTPException(status_code=e.response.status_code, detail=str(e))
        except httpx.RequestError as e:
            logger.error(f"Error occurred during request: {e}")
            raise HTTPException(status_code=500, detail=str(e))

async def process_non_streaming_response(request: ChatRequest):
    agent_mode = AGENT_MODE.get(request.model, {})
    trending_agent_mode = TRENDING_AGENT_MODE.get(request.model, {})
    model_prefix = MODEL_PREFIXES.get(request.model, "")
    referer_path = MODEL_REFERERS.get(request.model, f"/?model={request.model}")
    referer_url = f"{BASE_URL}{referer_path}"

    # Update headers with dynamic Referer
    dynamic_headers = headers.copy()
    dynamic_headers['Referer'] = referer_url

    json_data = {
        "messages": [message_to_dict(msg, model_prefix=model_prefix) for msg in request.messages],
        "previewToken": None,
        "userId": None,
        "codeModelMode": True,
        "agentMode": agent_mode,
        "trendingAgentMode": trending_agent_mode,
        "isMicMode": False,
        "userSystemPrompt": None,
        "maxTokens": request.max_tokens,
        "playgroundTopP": request.top_p,
        "playgroundTemperature": request.temperature,
        "isChromeExt": False,
        "githubToken": None,
        "clickedAnswer2": False,
        "clickedAnswer3": False,
        "clickedForceWebSearch": False,
        "visitFromDelta": False,
        "mobileClient": False,
        "userSelectedModel": MODEL_MAPPING.get(request.model, request.model),
    }
    full_response = ""
    async with httpx.AsyncClient() as client:
        try:
            async with client.stream(
                method="POST", url=f"{BASE_URL}/api/chat", headers=dynamic_headers, json=json_data
            ) as response:
                response.raise_for_status()
                async for chunk in response.aiter_text():
                    full_response += chunk
        except httpx.HTTPStatusError as e:
            logger.error(f"HTTP error occurred: {e}")
            raise HTTPException(status_code=e.response.status_code, detail=str(e))
        except httpx.RequestError as e:
            logger.error(f"Error occurred during request: {e}")
            raise HTTPException(status_code=500, detail=str(e))
    if full_response.startswith("$@$v=undefined-rv1$@$"):
        full_response = full_response[21:]

    # Strip the model prefix and handle code blocks
    cleaned_full_response = strip_model_prefix(full_response, model_prefix)

    return {
        "id": f"chatcmpl-{uuid.uuid4()}",
        "object": "chat.completion",
        "created": int(datetime.now().timestamp()),
        "model": request.model,
        "choices": [
            {
                "index": 0,
                "message": {"role": "assistant", "content": cleaned_full_response},
                "finish_reason": "stop",
            }
        ],
        "usage": None,
    }