open-webui/backend/open_webui/utils/middleware.py

import time
import logging
import sys
import os
import base64

import asyncio
from aiocache import cached
from typing import Any, Optional
import random
import json
import html
import inspect
import re
import ast

from uuid import uuid4
from concurrent.futures import ThreadPoolExecutor


from fastapi import Request
from fastapi import BackgroundTasks

from starlette.responses import Response, StreamingResponse


from open_webui.models.chats import Chats
from open_webui.models.users import Users
from open_webui.socket.main import (
    get_event_call,
    get_event_emitter,
    get_active_status_by_user_id,
)
from open_webui.routers.tasks import (
    generate_queries,
    generate_title,
    generate_image_prompt,
    generate_chat_tags,
)
from open_webui.routers.retrieval import process_web_search, SearchForm
from open_webui.routers.images import image_generations, GenerateImageForm


from open_webui.utils.webhook import post_webhook


from open_webui.models.users import UserModel
from open_webui.models.functions import Functions
from open_webui.models.models import Models

from open_webui.retrieval.utils import get_sources_from_files


from open_webui.utils.chat import generate_chat_completion
from open_webui.utils.task import (
    get_task_model_id,
    rag_template,
    tools_function_calling_generation_template,
)
from open_webui.utils.misc import (
    deep_update,
    get_message_list,
    add_or_update_system_message,
    add_or_update_user_message,
    get_last_user_message,
    get_last_assistant_message,
    prepend_to_first_user_message_content,
)
from open_webui.utils.tools import get_tools
from open_webui.utils.plugin import load_function_module_by_id
from open_webui.utils.filter import (
    get_sorted_filter_ids,
    process_filter_functions,
)


from open_webui.tasks import create_task

from open_webui.config import (
    CACHE_DIR,
    DEFAULT_TOOLS_FUNCTION_CALLING_PROMPT_TEMPLATE,
    DEFAULT_CODE_INTERPRETER_PROMPT,
)
from open_webui.env import (
    SRC_LOG_LEVELS,
    GLOBAL_LOG_LEVEL,
    BYPASS_MODEL_ACCESS_CONTROL,
    ENABLE_REALTIME_CHAT_SAVE,
)
from open_webui.constants import TASKS


logging.basicConfig(stream=sys.stdout, level=GLOBAL_LOG_LEVEL)
log = logging.getLogger(__name__)
log.setLevel(SRC_LOG_LEVELS["MAIN"])


async def chat_completion_tools_handler(
    request: Request, body: dict, user: UserModel, models, tools
) -> tuple[dict, dict]:
    async def get_content_from_response(response) -> Optional[str]:
        content = None
        if hasattr(response, "body_iterator"):
            async for chunk in response.body_iterator:
                data = json.loads(chunk.decode("utf-8"))
                content = data["choices"][0]["message"]["content"]

            # Cleanup any remaining background tasks if necessary
            if response.background is not None:
                await response.background()
        else:
            content = response["choices"][0]["message"]["content"]
        return content

    def get_tools_function_calling_payload(messages, task_model_id, content):
        user_message = get_last_user_message(messages)
        history = "\n".join(
            f"{message['role'].upper()}: \"\"\"{message['content']}\"\"\""
            for message in messages[::-1][:4]
        )

        prompt = f"History:\n{history}\nQuery: {user_message}"

        return {
            "model": task_model_id,
            "messages": [
                {"role": "system", "content": content},
                {"role": "user", "content": f"Query: {prompt}"},
            ],
            "stream": False,
            "metadata": {"task": str(TASKS.FUNCTION_CALLING)},
        }

    task_model_id = get_task_model_id(
        body["model"],
        request.app.state.config.TASK_MODEL,
        request.app.state.config.TASK_MODEL_EXTERNAL,
        models,
    )

    skip_files = False
    sources = []

    specs = [tool["spec"] for tool in tools.values()]
    tools_specs = json.dumps(specs)

    if request.app.state.config.TOOLS_FUNCTION_CALLING_PROMPT_TEMPLATE != "":
        template = request.app.state.config.TOOLS_FUNCTION_CALLING_PROMPT_TEMPLATE
    else:
        template = DEFAULT_TOOLS_FUNCTION_CALLING_PROMPT_TEMPLATE

    tools_function_calling_prompt = tools_function_calling_generation_template(
        template, tools_specs
    )
    log.info(f"{tools_function_calling_prompt=}")
    payload = get_tools_function_calling_payload(
        body["messages"], task_model_id, tools_function_calling_prompt
    )

    try:
        response = await generate_chat_completion(request, form_data=payload, user=user)
        log.debug(f"{response=}")
        content = await get_content_from_response(response)
        log.debug(f"{content=}")

        if not content:
            return body, {}

        try:
            content = content[content.find("{") : content.rfind("}") + 1]
            if not content:
                raise Exception("No JSON object found in the response")

            result = json.loads(content)

            async def tool_call_handler(tool_call):
                nonlocal skip_files

                log.debug(f"{tool_call=}")

                tool_function_name = tool_call.get("name", None)
                if tool_function_name not in tools:
                    return body, {}

                tool_function_params = tool_call.get("parameters", {})

                try:
                    required_params = (
                        tools[tool_function_name]
                        .get("spec", {})
                        .get("parameters", {})
                        .get("required", [])
                    )
                    tool_function = tools[tool_function_name]["callable"]
                    tool_function_params = {
                        k: v
                        for k, v in tool_function_params.items()
                        if k in required_params
                    }
                    tool_output = await tool_function(**tool_function_params)

                except Exception as e:
                    tool_output = str(e)

                if isinstance(tool_output, str):
                    if tools[tool_function_name]["citation"]:
                        sources.append(
                            {
                                "source": {
                                    "name": f"TOOL:{tools[tool_function_name]['toolkit_id']}/{tool_function_name}"
                                },
                                "document": [tool_output],
                                "metadata": [
                                    {
                                        "source": f"TOOL:{tools[tool_function_name]['toolkit_id']}/{tool_function_name}"
                                    }
                                ],
                            }
                        )
                    else:
                        sources.append(
                            {
                                "source": {},
                                "document": [tool_output],
                                "metadata": [
                                    {
                                        "source": f"TOOL:{tools[tool_function_name]['toolkit_id']}/{tool_function_name}"
                                    }
                                ],
                            }
                        )

                    if tools[tool_function_name]["file_handler"]:
                        skip_files = True

            # check if "tool_calls" in result
            if result.get("tool_calls"):
                for tool_call in result.get("tool_calls"):
                    await tool_call_handler(tool_call)
            else:
                await tool_call_handler(result)

        except Exception as e:
            log.exception(f"Error: {e}")
            content = None
    except Exception as e:
        log.exception(f"Error: {e}")
        content = None

    log.debug(f"tool_contexts: {sources}")

    if skip_files and "files" in body.get("metadata", {}):
        del body["metadata"]["files"]

    return body, {"sources": sources}


async def chat_web_search_handler(
    request: Request, form_data: dict, extra_params: dict, user
):
    event_emitter = extra_params["__event_emitter__"]
    await event_emitter(
        {
            "type": "status",
            "data": {
                "action": "web_search",
                "description": "Generating search query",
                "done": False,
            },
        }
    )

    messages = form_data["messages"]
    user_message = get_last_user_message(messages)

    queries = []
    try:
        res = await generate_queries(
            request,
            {
                "model": form_data["model"],
                "messages": messages,
                "prompt": user_message,
                "type": "web_search",
            },
            user,
        )

        response = res["choices"][0]["message"]["content"]

        try:
            bracket_start = response.find("{")
            bracket_end = response.rfind("}") + 1

            if bracket_start == -1 or bracket_end == -1:
                raise Exception("No JSON object found in the response")

            response = response[bracket_start:bracket_end]
            queries = json.loads(response)
            queries = queries.get("queries", [])
        except Exception as e:
            queries = [response]

    except Exception as e:
        log.exception(e)
        queries = [user_message]

    if len(queries) == 0:
        await event_emitter(
            {
                "type": "status",
                "data": {
                    "action": "web_search",
                    "description": "No search query generated",
                    "done": True,
                },
            }
        )
        return form_data

    searchQuery = queries[0]

    await event_emitter(
        {
            "type": "status",
            "data": {
                "action": "web_search",
                "description": 'Searching "{{searchQuery}}"',
                "query": searchQuery,
                "done": False,
            },
        }
    )

    try:

        results = await process_web_search(
            request,
            SearchForm(
                **{
                    "query": searchQuery,
                }
            ),
            user=user
        )

        if results:
            await event_emitter(
                {
                    "type": "status",
                    "data": {
                        "action": "web_search",
                        "description": "Searched {{count}} sites",
                        "query": searchQuery,
                        "urls": results["filenames"],
                        "done": True,
                    },
                }
            )

            files = form_data.get("files", [])
            files.append(
                {
                    "collection_name": results["collection_name"],
                    "name": searchQuery,
                    "type": "web_search_results",
                    "urls": results["filenames"],
                }
            )
            form_data["files"] = files
        else:
            await event_emitter(
                {
                    "type": "status",
                    "data": {
                        "action": "web_search",
                        "description": "No search results found",
                        "query": searchQuery,
                        "done": True,
                        "error": True,
                    },
                }
            )
    except Exception as e:
        log.exception(e)
        await event_emitter(
            {
                "type": "status",
                "data": {
                    "action": "web_search",
                    "description": 'Error searching "{{searchQuery}}"',
                    "query": searchQuery,
                    "done": True,
                    "error": True,
                },
            }
        )

    return form_data


async def chat_image_generation_handler(
    request: Request, form_data: dict, extra_params: dict, user
):
    __event_emitter__ = extra_params["__event_emitter__"]
    await __event_emitter__(
        {
            "type": "status",
            "data": {"description": "Generating an image", "done": False},
        }
    )

    messages = form_data["messages"]
    user_message = get_last_user_message(messages)

    prompt = user_message
    negative_prompt = ""

    if request.app.state.config.ENABLE_IMAGE_PROMPT_GENERATION:
        try:
            res = await generate_image_prompt(
                request,
                {
                    "model": form_data["model"],
                    "messages": messages,
                },
                user,
            )

            response = res["choices"][0]["message"]["content"]

            try:
                bracket_start = response.find("{")
                bracket_end = response.rfind("}") + 1

                if bracket_start == -1 or bracket_end == -1:
                    raise Exception("No JSON object found in the response")

                response = response[bracket_start:bracket_end]
                response = json.loads(response)
                prompt = response.get("prompt", [])
            except Exception as e:
                prompt = user_message

        except Exception as e:
            log.exception(e)
            prompt = user_message

    system_message_content = ""

    try:
        images = await image_generations(
            request=request,
            form_data=GenerateImageForm(**{"prompt": prompt}),
            user=user,
        )

        await __event_emitter__(
            {
                "type": "status",
                "data": {"description": "Generated an image", "done": True},
            }
        )

        for image in images:
            await __event_emitter__(
                {
                    "type": "message",
                    "data": {"content": f"![Generated Image]({image['url']})\n"},
                }
            )

        system_message_content = "<context>User is shown the generated image, tell the user that the image has been generated</context>"
    except Exception as e:
        log.exception(e)
        await __event_emitter__(
            {
                "type": "status",
                "data": {
                    "description": f"An error occurred while generating an image",
                    "done": True,
                },
            }
        )

        system_message_content = "<context>Unable to generate an image, tell the user that an error occurred</context>"

    if system_message_content:
        form_data["messages"] = add_or_update_system_message(
            system_message_content, form_data["messages"]
        )

    return form_data


async def chat_completion_files_handler(
    request: Request, body: dict, user: UserModel
) -> tuple[dict, dict[str, list]]:
    sources = []

    if files := body.get("metadata", {}).get("files", None):
        try:
            queries_response = await generate_queries(
                request,
                {
                    "model": body["model"],
                    "messages": body["messages"],
                    "type": "retrieval",
                },
                user,
            )
            queries_response = queries_response["choices"][0]["message"]["content"]

            try:
                bracket_start = queries_response.find("{")
                bracket_end = queries_response.rfind("}") + 1

                if bracket_start == -1 or bracket_end == -1:
                    raise Exception("No JSON object found in the response")

                queries_response = queries_response[bracket_start:bracket_end]
                queries_response = json.loads(queries_response)
            except Exception as e:
                queries_response = {"queries": [queries_response]}

            queries = queries_response.get("queries", [])
        except Exception as e:
            queries = []

        if len(queries) == 0:
            queries = [get_last_user_message(body["messages"])]

        try:
            # Offload get_sources_from_files to a separate thread
            loop = asyncio.get_running_loop()
            with ThreadPoolExecutor() as executor:
                sources = await loop.run_in_executor(
                    executor,
                    lambda: get_sources_from_files(
                        files=files,
                        queries=queries,
                        embedding_function=lambda query: request.app.state.EMBEDDING_FUNCTION(
                            query, user=user
                        ),
                        k=request.app.state.config.TOP_K,
                        reranking_function=request.app.state.rf,
                        r=request.app.state.config.RELEVANCE_THRESHOLD,
                        hybrid_search=request.app.state.config.ENABLE_RAG_HYBRID_SEARCH,
                    ),
                )

        except Exception as e:
            log.exception(e)

        log.debug(f"rag_contexts:sources: {sources}")

    return body, {"sources": sources}


def apply_params_to_form_data(form_data, model):
    params = form_data.pop("params", {})
    if model.get("ollama"):
        form_data["options"] = params

        if "format" in params:
            form_data["format"] = params["format"]

        if "keep_alive" in params:
            form_data["keep_alive"] = params["keep_alive"]
    else:
        if "seed" in params:
            form_data["seed"] = params["seed"]

        if "stop" in params:
            form_data["stop"] = params["stop"]

        if "temperature" in params:
            form_data["temperature"] = params["temperature"]

        if "max_tokens" in params:
            form_data["max_tokens"] = params["max_tokens"]

        if "top_p" in params:
            form_data["top_p"] = params["top_p"]

        if "frequency_penalty" in params:
            form_data["frequency_penalty"] = params["frequency_penalty"]

        if "reasoning_effort" in params:
            form_data["reasoning_effort"] = params["reasoning_effort"]

    return form_data


async def process_chat_payload(request, form_data, metadata, user, model):

    form_data = apply_params_to_form_data(form_data, model)
    log.debug(f"form_data: {form_data}")

    event_emitter = get_event_emitter(metadata)
    event_call = get_event_call(metadata)

    extra_params = {
        "__event_emitter__": event_emitter,
        "__event_call__": event_call,
        "__user__": {
            "id": user.id,
            "email": user.email,
            "name": user.name,
            "role": user.role,
        },
        "__metadata__": metadata,
        "__request__": request,
        "__model__": model,
    }

    # Initialize events to store additional event to be sent to the client
    # Initialize contexts and citation
    models = request.app.state.MODELS
    task_model_id = get_task_model_id(
        form_data["model"],
        request.app.state.config.TASK_MODEL,
        request.app.state.config.TASK_MODEL_EXTERNAL,
        models,
    )

    events = []
    sources = []

    user_message = get_last_user_message(form_data["messages"])
    model_knowledge = model.get("info", {}).get("meta", {}).get("knowledge", False)

    if model_knowledge:
        await event_emitter(
            {
                "type": "status",
                "data": {
                    "action": "knowledge_search",
                    "query": user_message,
                    "done": False,
                },
            }
        )

        knowledge_files = []
        for item in model_knowledge:
            if item.get("collection_name"):
                knowledge_files.append(
                    {
                        "id": item.get("collection_name"),
                        "name": item.get("name"),
                        "legacy": True,
                    }
                )
            elif item.get("collection_names"):
                knowledge_files.append(
                    {
                        "name": item.get("name"),
                        "type": "collection",
                        "collection_names": item.get("collection_names"),
                        "legacy": True,
                    }
                )
            else:
                knowledge_files.append(item)

        files = form_data.get("files", [])
        files.extend(knowledge_files)
        form_data["files"] = files

    variables = form_data.pop("variables", None)

    features = form_data.pop("features", None)
    if features:
        if "web_search" in features and features["web_search"]:
            form_data = await chat_web_search_handler(
                request, form_data, extra_params, user
            )

        if "image_generation" in features and features["image_generation"]:
            form_data = await chat_image_generation_handler(
                request, form_data, extra_params, user
            )

        if "code_interpreter" in features and features["code_interpreter"]:
            form_data["messages"] = add_or_update_user_message(
                DEFAULT_CODE_INTERPRETER_PROMPT, form_data["messages"]
            )

    try:
        form_data, flags = await process_filter_functions(
            request=request,
            filter_ids=get_sorted_filter_ids(model),
            filter_type="inlet",
            form_data=form_data,
            extra_params=extra_params,
        )
    except Exception as e:
        raise Exception(f"Error: {e}")

    tool_ids = form_data.pop("tool_ids", None)
    files = form_data.pop("files", None)
    # Remove files duplicates
    if files:
        files = list({json.dumps(f, sort_keys=True): f for f in files}.values())

    metadata = {
        **metadata,
        "tool_ids": tool_ids,
        "files": files,
    }
    form_data["metadata"] = metadata

    tool_ids = metadata.get("tool_ids", None)
    log.debug(f"{tool_ids=}")

    if tool_ids:
        # If tool_ids field is present, then get the tools
        tools = get_tools(
            request,
            tool_ids,
            user,
            {
                **extra_params,
                "__model__": models[task_model_id],
                "__messages__": form_data["messages"],
                "__files__": metadata.get("files", []),
            },
        )
        log.info(f"{tools=}")

        if metadata.get("function_calling") == "native":
            # If the function calling is native, then call the tools function calling handler
            metadata["tools"] = tools
            form_data["tools"] = [
                {"type": "function", "function": tool.get("spec", {})}
                for tool in tools.values()
            ]
        else:
            # If the function calling is not native, then call the tools function calling handler
            try:
                form_data, flags = await chat_completion_tools_handler(
                    request, form_data, user, models, tools
                )
                sources.extend(flags.get("sources", []))

            except Exception as e:
                log.exception(e)

    try:
        form_data, flags = await chat_completion_files_handler(request, form_data, user)
        sources.extend(flags.get("sources", []))
    except Exception as e:
        log.exception(e)

    # If context is not empty, insert it into the messages
    if len(sources) > 0:
        context_string = ""
        for source_idx, source in enumerate(sources):
            source_id = source.get("source", {}).get("name", "")

            if "document" in source:
                for doc_idx, doc_context in enumerate(source["document"]):
                    doc_metadata = source.get("metadata")
                    doc_source_id = None

                    if doc_metadata:
                        doc_source_id = doc_metadata[doc_idx].get("source", source_id)

                    if source_id:
                        context_string += f"<source><source_id>{doc_source_id if doc_source_id is not None else source_id}</source_id><source_context>{doc_context}</source_context></source>\n"
                    else:
                        # If there is no source_id, then do not include the source_id tag
                        context_string += f"<source><source_context>{doc_context}</source_context></source>\n"

        context_string = context_string.strip()
        prompt = get_last_user_message(form_data["messages"])

        if prompt is None:
            raise Exception("No user message found")
        if (
            request.app.state.config.RELEVANCE_THRESHOLD == 0
            and context_string.strip() == ""
        ):
            log.debug(
                f"With a 0 relevancy threshold for RAG, the context cannot be empty"
            )

        # Workaround for Ollama 2.0+ system prompt issue
        # TODO: replace with add_or_update_system_message
        if model["owned_by"] == "ollama":
            form_data["messages"] = prepend_to_first_user_message_content(
                rag_template(
                    request.app.state.config.RAG_TEMPLATE, context_string, prompt
                ),
                form_data["messages"],
            )
        else:
            form_data["messages"] = add_or_update_system_message(
                rag_template(
                    request.app.state.config.RAG_TEMPLATE, context_string, prompt
                ),
                form_data["messages"],
            )

    # If there are citations, add them to the data_items
    sources = [source for source in sources if source.get("source", {}).get("name", "")]

    if len(sources) > 0:
        events.append({"sources": sources})

    if model_knowledge:
        await event_emitter(
            {
                "type": "status",
                "data": {
                    "action": "knowledge_search",
                    "query": user_message,
                    "done": True,
                    "hidden": True,
                },
            }
        )

    return form_data, metadata, events


async def process_chat_response(
    request, response, form_data, user, events, metadata, tasks
):
    async def background_tasks_handler():
        message_map = Chats.get_messages_by_chat_id(metadata["chat_id"])
        message = message_map.get(metadata["message_id"]) if message_map else None

        if message:
            messages = get_message_list(message_map, message.get("id"))

            if tasks and messages:
                if TASKS.TITLE_GENERATION in tasks:
                    if tasks[TASKS.TITLE_GENERATION]:
                        res = await generate_title(
                            request,
                            {
                                "model": message["model"],
                                "messages": messages,
                                "chat_id": metadata["chat_id"],
                            },
                            user,
                        )

                        if res and isinstance(res, dict):
                            if len(res.get("choices", [])) == 1:
                                title_string = (
                                    res.get("choices", [])[0]
                                    .get("message", {})
                                    .get("content", message.get("content", "New Chat"))
                                )
                            else:
                                title_string = ""

                            title_string = title_string[
                                title_string.find("{") : title_string.rfind("}") + 1
                            ]

                            try:
                                title = json.loads(title_string).get(
                                    "title", "New Chat"
                                )
                            except Exception as e:
                                title = ""

                            if not title:
                                title = messages[0].get("content", "New Chat")

                            Chats.update_chat_title_by_id(metadata["chat_id"], title)

                            await event_emitter(
                                {
                                    "type": "chat:title",
                                    "data": title,
                                }
                            )
                    elif len(messages) == 2:
                        title = messages[0].get("content", "New Chat")

                        Chats.update_chat_title_by_id(metadata["chat_id"], title)

                        await event_emitter(
                            {
                                "type": "chat:title",
                                "data": message.get("content", "New Chat"),
                            }
                        )

                if TASKS.TAGS_GENERATION in tasks and tasks[TASKS.TAGS_GENERATION]:
                    res = await generate_chat_tags(
                        request,
                        {
                            "model": message["model"],
                            "messages": messages,
                            "chat_id": metadata["chat_id"],
                        },
                        user,
                    )

                    if res and isinstance(res, dict):
                        if len(res.get("choices", [])) == 1:
                            tags_string = (
                                res.get("choices", [])[0]
                                .get("message", {})
                                .get("content", "")
                            )
                        else:
                            tags_string = ""

                        tags_string = tags_string[
                            tags_string.find("{") : tags_string.rfind("}") + 1
                        ]

                        try:
                            tags = json.loads(tags_string).get("tags", [])
                            Chats.update_chat_tags_by_id(
                                metadata["chat_id"], tags, user
                            )

                            await event_emitter(
                                {
                                    "type": "chat:tags",
                                    "data": tags,
                                }
                            )
                        except Exception as e:
                            pass

    event_emitter = None
    event_caller = None
    if (
        "session_id" in metadata
        and metadata["session_id"]
        and "chat_id" in metadata
        and metadata["chat_id"]
        and "message_id" in metadata
        and metadata["message_id"]
    ):
        event_emitter = get_event_emitter(metadata)
        event_caller = get_event_call(metadata)

    # Non-streaming response
    if not isinstance(response, StreamingResponse):
        if event_emitter:
            if "selected_model_id" in response:
                Chats.upsert_message_to_chat_by_id_and_message_id(
                    metadata["chat_id"],
                    metadata["message_id"],
                    {
                        "selectedModelId": response["selected_model_id"],
                    },
                )

            if response.get("choices", [])[0].get("message", {}).get("content"):
                content = response["choices"][0]["message"]["content"]

                if content:

                    await event_emitter(
                        {
                            "type": "chat:completion",
                            "data": response,
                        }
                    )

                    title = Chats.get_chat_title_by_id(metadata["chat_id"])

                    await event_emitter(
                        {
                            "type": "chat:completion",
                            "data": {
                                "done": True,
                                "content": content,
                                "title": title,
                            },
                        }
                    )

                    # Save message in the database
                    Chats.upsert_message_to_chat_by_id_and_message_id(
                        metadata["chat_id"],
                        metadata["message_id"],
                        {
                            "content": content,
                        },
                    )

                    # Send a webhook notification if the user is not active
                    if get_active_status_by_user_id(user.id) is None:
                        webhook_url = Users.get_user_webhook_url_by_id(user.id)
                        if webhook_url:
                            post_webhook(
                                webhook_url,
                                f"{title} - {request.app.state.config.WEBUI_URL}/c/{metadata['chat_id']}\n\n{content}",
                                {
                                    "action": "chat",
                                    "message": content,
                                    "title": title,
                                    "url": f"{request.app.state.config.WEBUI_URL}/c/{metadata['chat_id']}",
                                },
                            )

                    await background_tasks_handler()

            return response
        else:
            return response

    # Non standard response
    if not any(
        content_type in response.headers["Content-Type"]
        for content_type in ["text/event-stream", "application/x-ndjson"]
    ):
        return response

    # Streaming response
    if event_emitter and event_caller:
        task_id = str(uuid4())  # Create a unique task ID.
        model_id = form_data.get("model", "")

        Chats.upsert_message_to_chat_by_id_and_message_id(
            metadata["chat_id"],
            metadata["message_id"],
            {
                "model": model_id,
            },
        )

        def split_content_and_whitespace(content):
            content_stripped = content.rstrip()
            original_whitespace = (
                content[len(content_stripped) :]
                if len(content) > len(content_stripped)
                else ""
            )
            return content_stripped, original_whitespace

        def is_opening_code_block(content):
            backtick_segments = content.split("```")
            # Even number of segments means the last backticks are opening a new block
            return len(backtick_segments) > 1 and len(backtick_segments) % 2 == 0

        # Handle as a background task
        async def post_response_handler(response, events):
            def serialize_content_blocks(content_blocks, raw=False):
                content = ""

                for block in content_blocks:
                    if block["type"] == "text":
                        content = f"{content}{block['content'].strip()}\n"
                    elif block["type"] == "tool_calls":
                        attributes = block.get("attributes", {})

                        block_content = block.get("content", [])
                        results = block.get("results", [])

                        if results:

                            result_display_content = ""

                            for result in results:
                                tool_call_id = result.get("tool_call_id", "")
                                tool_name = ""

                                for tool_call in block_content:
                                    if tool_call.get("id", "") == tool_call_id:
                                        tool_name = tool_call.get("function", {}).get(
                                            "name", ""
                                        )
                                        break

                                result_display_content = f"{result_display_content}\n> {tool_name}: {result.get('content', '')}"

                            if not raw:
                                content = f'{content}\n<details type="tool_calls" done="true" content="{html.escape(json.dumps(block_content))}" results="{html.escape(json.dumps(results))}">\n<summary>Tool Executed</summary>\n{result_display_content}\n</details>\n'
                        else:
                            tool_calls_display_content = ""

                            for tool_call in block_content:
                                tool_calls_display_content = f"{tool_calls_display_content}\n> Executing {tool_call.get('function', {}).get('name', '')}"

                            if not raw:
                                content = f'{content}\n<details type="tool_calls" done="false" content="{html.escape(json.dumps(block_content))}">\n<summary>Tool Executing...</summary>\n{tool_calls_display_content}\n</details>\n'

                    elif block["type"] == "reasoning":
                        reasoning_display_content = "\n".join(
                            (f"> {line}" if not line.startswith(">") else line)
                            for line in block["content"].splitlines()
                        )

                        reasoning_duration = block.get("duration", None)

                        if reasoning_duration is not None:
                            if raw:
                                content = f'{content}\n<{block["tag"]}>{block["content"]}</{block["tag"]}>\n'
                            else:
                                content = f'{content}\n<details type="reasoning" done="true" duration="{reasoning_duration}">\n<summary>Thought for {reasoning_duration} seconds</summary>\n{reasoning_display_content}\n</details>\n'
                        else:
                            if raw:
                                content = f'{content}\n<{block["tag"]}>{block["content"]}</{block["tag"]}>\n'
                            else:
                                content = f'{content}\n<details type="reasoning" done="false">\n<summary>Thinking…</summary>\n{reasoning_display_content}\n</details>\n'

                    elif block["type"] == "code_interpreter":
                        attributes = block.get("attributes", {})
                        output = block.get("output", None)
                        lang = attributes.get("lang", "")

                        content_stripped, original_whitespace = (
                            split_content_and_whitespace(content)
                        )
                        if is_opening_code_block(content_stripped):
                            # Remove trailing backticks that would open a new block
                            content = (
                                content_stripped.rstrip("`").rstrip()
                                + original_whitespace
                            )
                        else:
                            # Keep content as is - either closing backticks or no backticks
                            content = content_stripped + original_whitespace

                        if output:
                            output = html.escape(json.dumps(output))

                            if raw:
                                content = f'{content}\n<code_interpreter type="code" lang="{lang}">\n{block["content"]}\n</code_interpreter>\n```output\n{output}\n```\n'
                            else:
                                content = f'{content}\n<details type="code_interpreter" done="true" output="{output}">\n<summary>Analyzed</summary>\n```{lang}\n{block["content"]}\n```\n</details>\n'
                        else:
                            if raw:
                                content = f'{content}\n<code_interpreter type="code" lang="{lang}">\n{block["content"]}\n</code_interpreter>\n'
                            else:
                                content = f'{content}\n<details type="code_interpreter" done="false">\n<summary>Analyzing...</summary>\n```{lang}\n{block["content"]}\n```\n</details>\n'

                    else:
                        block_content = str(block["content"]).strip()
                        content = f"{content}{block['type']}: {block_content}\n"

                return content.strip()

            def tag_content_handler(content_type, tags, content, content_blocks):
                end_flag = False

                def extract_attributes(tag_content):
                    """Extract attributes from a tag if they exist."""
                    attributes = {}
                    if not tag_content:  # Ensure tag_content is not None
                        return attributes
                    # Match attributes in the format: key="value" (ignores single quotes for simplicity)
                    matches = re.findall(r'(\w+)\s*=\s*"([^"]+)"', tag_content)
                    for key, value in matches:
                        attributes[key] = value
                    return attributes

                if content_blocks[-1]["type"] == "text":
                    for tag in tags:
                        # Match start tag e.g., <tag> or <tag attr="value">
                        start_tag_pattern = rf"<{tag}(\s.*?)?>"
                        match = re.search(start_tag_pattern, content)
                        if match:
                            attr_content = (
                                match.group(1) if match.group(1) else ""
                            )  # Ensure it's not None
                            attributes = extract_attributes(
                                attr_content
                            )  # Extract attributes safely

                            # Capture everything before and after the matched tag
                            before_tag = content[
                                : match.start()
                            ]  # Content before opening tag
                            after_tag = content[
                                match.end() :
                            ]  # Content after opening tag

                            # Remove the start tag and after from the currently handling text block
                            content_blocks[-1]["content"] = content_blocks[-1][
                                "content"
                            ].replace(match.group(0) + after_tag, "")

                            if before_tag:
                                content_blocks[-1]["content"] = before_tag

                            if not content_blocks[-1]["content"]:
                                content_blocks.pop()

                            # Append the new block
                            content_blocks.append(
                                {
                                    "type": content_type,
                                    "tag": tag,
                                    "attributes": attributes,
                                    "content": "",
                                    "started_at": time.time(),
                                }
                            )

                            if after_tag:
                                content_blocks[-1]["content"] = after_tag

                            break
                elif content_blocks[-1]["type"] == content_type:
                    tag = content_blocks[-1]["tag"]
                    # Match end tag e.g., </tag>
                    end_tag_pattern = rf"</{tag}>"

                    # Check if the content has the end tag
                    if re.search(end_tag_pattern, content):
                        end_flag = True

                        block_content = content_blocks[-1]["content"]
                        # Strip start and end tags from the content
                        start_tag_pattern = rf"<{tag}(.*?)>"
                        block_content = re.sub(
                            start_tag_pattern, "", block_content
                        ).strip()

                        end_tag_regex = re.compile(end_tag_pattern, re.DOTALL)
                        split_content = end_tag_regex.split(block_content, maxsplit=1)

                        # Content inside the tag
                        block_content = (
                            split_content[0].strip() if split_content else ""
                        )

                        # Leftover content (everything after `</tag>`)
                        leftover_content = (
                            split_content[1].strip() if len(split_content) > 1 else ""
                        )

                        if block_content:
                            content_blocks[-1]["content"] = block_content
                            content_blocks[-1]["ended_at"] = time.time()
                            content_blocks[-1]["duration"] = int(
                                content_blocks[-1]["ended_at"]
                                - content_blocks[-1]["started_at"]
                            )

                            # Reset the content_blocks by appending a new text block
                            if content_type != "code_interpreter":
                                if leftover_content:

                                    content_blocks.append(
                                        {
                                            "type": "text",
                                            "content": leftover_content,
                                        }
                                    )
                                else:
                                    content_blocks.append(
                                        {
                                            "type": "text",
                                            "content": "",
                                        }
                                    )

                        else:
                            # Remove the block if content is empty
                            content_blocks.pop()

                            if leftover_content:
                                content_blocks.append(
                                    {
                                        "type": "text",
                                        "content": leftover_content,
                                    }
                                )
                            else:
                                content_blocks.append(
                                    {
                                        "type": "text",
                                        "content": "",
                                    }
                                )

                        # Clean processed content
                        content = re.sub(
                            rf"<{tag}(.*?)>(.|\n)*?</{tag}>",
                            "",
                            content,
                            flags=re.DOTALL,
                        )

                return content, content_blocks, end_flag

            message = Chats.get_message_by_id_and_message_id(
                metadata["chat_id"], metadata["message_id"]
            )

            tool_calls = []
            content = message.get("content", "") if message else ""
            content_blocks = [
                {
                    "type": "text",
                    "content": content,
                }
            ]

            # We might want to disable this by default
            DETECT_REASONING = True
            DETECT_CODE_INTERPRETER = metadata.get("features", {}).get(
                "code_interpreter", False
            )

            reasoning_tags = [
                "think",
                "thinking",
                "reason",
                "reasoning",
                "thought",
                "Thought",
            ]
            code_interpreter_tags = ["code_interpreter"]

            try:
                for event in events:
                    await event_emitter(
                        {
                            "type": "chat:completion",
                            "data": event,
                        }
                    )

                    # Save message in the database
                    Chats.upsert_message_to_chat_by_id_and_message_id(
                        metadata["chat_id"],
                        metadata["message_id"],
                        {
                            **event,
                        },
                    )

                async def stream_body_handler(response):
                    nonlocal content
                    nonlocal content_blocks

                    response_tool_calls = []

                    async for line in response.body_iterator:
                        line = line.decode("utf-8") if isinstance(line, bytes) else line
                        data = line

                        # Skip empty lines
                        if not data.strip():
                            continue

                        # "data:" is the prefix for each event
                        if not data.startswith("data:"):
                            continue

                        # Remove the prefix
                        data = data[len("data:") :].strip()

                        try:
                            data = json.loads(data)

                            if "selected_model_id" in data:
                                model_id = data["selected_model_id"]
                                Chats.upsert_message_to_chat_by_id_and_message_id(
                                    metadata["chat_id"],
                                    metadata["message_id"],
                                    {
                                        "selectedModelId": model_id,
                                    },
                                )
                            else:
                                choices = data.get("choices", [])
                                if not choices:
                                    continue

                                delta = choices[0].get("delta", {})
                                delta_tool_calls = delta.get("tool_calls", None)

                                if delta_tool_calls:
                                    for delta_tool_call in delta_tool_calls:
                                        tool_call_index = delta_tool_call.get("index")

                                        if tool_call_index is not None:
                                            if (
                                                len(response_tool_calls)
                                                <= tool_call_index
                                            ):
                                                response_tool_calls.append(
                                                    delta_tool_call
                                                )
                                            else:
                                                delta_name = delta_tool_call.get(
                                                    "function", {}
                                                ).get("name")
                                                delta_arguments = delta_tool_call.get(
                                                    "function", {}
                                                ).get("arguments")

                                                if delta_name:
                                                    response_tool_calls[
                                                        tool_call_index
                                                    ]["function"]["name"] += delta_name

                                                if delta_arguments:
                                                    response_tool_calls[
                                                        tool_call_index
                                                    ]["function"][
                                                        "arguments"
                                                    ] += delta_arguments

                                value = delta.get("content")

                                if value:
                                    content = f"{content}{value}"

                                    if not content_blocks:
                                        content_blocks.append(
                                            {
                                                "type": "text",
                                                "content": "",
                                            }
                                        )

                                    content_blocks[-1]["content"] = (
                                        content_blocks[-1]["content"] + value
                                    )

                                    if DETECT_REASONING:
                                        content, content_blocks, _ = (
                                            tag_content_handler(
                                                "reasoning",
                                                reasoning_tags,
                                                content,
                                                content_blocks,
                                            )
                                        )

                                    if DETECT_CODE_INTERPRETER:
                                        content, content_blocks, end = (
                                            tag_content_handler(
                                                "code_interpreter",
                                                code_interpreter_tags,
                                                content,
                                                content_blocks,
                                            )
                                        )

                                        if end:
                                            break

                                    if ENABLE_REALTIME_CHAT_SAVE:
                                        # Save message in the database
                                        Chats.upsert_message_to_chat_by_id_and_message_id(
                                            metadata["chat_id"],
                                            metadata["message_id"],
                                            {
                                                "content": serialize_content_blocks(
                                                    content_blocks
                                                ),
                                            },
                                        )
                                    else:
                                        data = {
                                            "content": serialize_content_blocks(
                                                content_blocks
                                            ),
                                        }

                            await event_emitter(
                                {
                                    "type": "chat:completion",
                                    "data": data,
                                }
                            )
                        except Exception as e:
                            done = "data: [DONE]" in line
                            if done:
                                pass
                            else:
                                log.debug("Error: ", e)
                                continue

                    if content_blocks:
                        # Clean up the last text block
                        if content_blocks[-1]["type"] == "text":
                            content_blocks[-1]["content"] = content_blocks[-1][
                                "content"
                            ].strip()

                            if not content_blocks[-1]["content"]:
                                content_blocks.pop()

                                if not content_blocks:
                                    content_blocks.append(
                                        {
                                            "type": "text",
                                            "content": "",
                                        }
                                    )

                    if response_tool_calls:
                        tool_calls.append(response_tool_calls)

                    if response.background:
                        await response.background()

                await stream_body_handler(response)

                MAX_TOOL_CALL_RETRIES = 5
                tool_call_retries = 0

                while len(tool_calls) > 0 and tool_call_retries < MAX_TOOL_CALL_RETRIES:
                    tool_call_retries += 1

                    response_tool_calls = tool_calls.pop(0)

                    content_blocks.append(
                        {
                            "type": "tool_calls",
                            "content": response_tool_calls,
                        }
                    )

                    await event_emitter(
                        {
                            "type": "chat:completion",
                            "data": {
                                "content": serialize_content_blocks(content_blocks),
                            },
                        }
                    )

                    tools = metadata.get("tools", {})

                    results = []
                    for tool_call in response_tool_calls:
                        print("\n\n" + str(tool_call) + "\n\n")
                        tool_call_id = tool_call.get("id", "")
                        tool_name = tool_call.get("function", {}).get("name", "")

                        tool_function_params = {}
                        try:
                            # json.loads cannot be used because some models do not produce valid JSON
                            tool_function_params = ast.literal_eval(
                                tool_call.get("function", {}).get("arguments", "{}")
                            )
                        except Exception as e:
                            log.debug(e)

                        tool_result = None

                        if tool_name in tools:
                            tool = tools[tool_name]
                            spec = tool.get("spec", {})

                            try:
                                required_params = spec.get("parameters", {}).get(
                                    "required", []
                                )
                                tool_function = tool["callable"]
                                tool_function_params = {
                                    k: v
                                    for k, v in tool_function_params.items()
                                    if k in required_params
                                }
                                tool_result = await tool_function(
                                    **tool_function_params
                                )
                            except Exception as e:
                                tool_result = str(e)

                        results.append(
                            {
                                "tool_call_id": tool_call_id,
                                "content": tool_result,
                            }
                        )

                    content_blocks[-1]["results"] = results

                    content_blocks.append(
                        {
                            "type": "text",
                            "content": "",
                        }
                    )

                    await event_emitter(
                        {
                            "type": "chat:completion",
                            "data": {
                                "content": serialize_content_blocks(content_blocks),
                            },
                        }
                    )

                    try:
                        res = await generate_chat_completion(
                            request,
                            {
                                "model": model_id,
                                "stream": True,
                                "messages": [
                                    *form_data["messages"],
                                    {
                                        "role": "assistant",
                                        "content": serialize_content_blocks(
                                            content_blocks, raw=True
                                        ),
                                        "tool_calls": response_tool_calls,
                                    },
                                    *[
                                        {
                                            "role": "tool",
                                            "tool_call_id": result["tool_call_id"],
                                            "content": result["content"],
                                        }
                                        for result in results
                                    ],
                                ],
                            },
                            user,
                        )

                        if isinstance(res, StreamingResponse):
                            await stream_body_handler(res)
                        else:
                            break
                    except Exception as e:
                        log.debug(e)
                        break

                if DETECT_CODE_INTERPRETER:
                    MAX_RETRIES = 5
                    retries = 0

                    while (
                        content_blocks[-1]["type"] == "code_interpreter"
                        and retries < MAX_RETRIES
                    ):
                        retries += 1
                        log.debug(f"Attempt count: {retries}")

                        output = ""
                        try:
                            if content_blocks[-1]["attributes"].get("type") == "code":
                                output = await event_caller(
                                    {
                                        "type": "execute:python",
                                        "data": {
                                            "id": str(uuid4()),
                                            "code": content_blocks[-1]["content"],
                                        },
                                    }
                                )

                                if isinstance(output, dict):
                                    stdout = output.get("stdout", "")

                                    if stdout:
                                        stdoutLines = stdout.split("\n")
                                        for idx, line in enumerate(stdoutLines):
                                            if "data:image/png;base64" in line:
                                                id = str(uuid4())

                                                # ensure the path exists
                                                os.makedirs(
                                                    os.path.join(CACHE_DIR, "images"),
                                                    exist_ok=True,
                                                )

                                                image_path = os.path.join(
                                                    CACHE_DIR,
                                                    f"images/{id}.png",
                                                )

                                                with open(image_path, "wb") as f:
                                                    f.write(
                                                        base64.b64decode(
                                                            line.split(",")[1]
                                                        )
                                                    )

                                                stdoutLines[idx] = (
                                                    f"![Output Image {idx}](/cache/images/{id}.png)"
                                                )

                                        output["stdout"] = "\n".join(stdoutLines)
                        except Exception as e:
                            output = str(e)

                        content_blocks[-1]["output"] = output

                        content_blocks.append(
                            {
                                "type": "text",
                                "content": "",
                            }
                        )

                        await event_emitter(
                            {
                                "type": "chat:completion",
                                "data": {
                                    "content": serialize_content_blocks(content_blocks),
                                },
                            }
                        )

                        try:
                            res = await generate_chat_completion(
                                request,
                                {
                                    "model": model_id,
                                    "stream": True,
                                    "messages": [
                                        *form_data["messages"],
                                        {
                                            "role": "assistant",
                                            "content": serialize_content_blocks(
                                                content_blocks, raw=True
                                            ),
                                        },
                                    ],
                                },
                                user,
                            )

                            if isinstance(res, StreamingResponse):
                                await stream_body_handler(res)
                            else:
                                break
                        except Exception as e:
                            log.debug(e)
                            break

                title = Chats.get_chat_title_by_id(metadata["chat_id"])
                data = {
                    "done": True,
                    "content": serialize_content_blocks(content_blocks),
                    "title": title,
                }

                if not ENABLE_REALTIME_CHAT_SAVE:
                    # Save message in the database
                    Chats.upsert_message_to_chat_by_id_and_message_id(
                        metadata["chat_id"],
                        metadata["message_id"],
                        {
                            "content": serialize_content_blocks(content_blocks),
                        },
                    )

                # Send a webhook notification if the user is not active
                if get_active_status_by_user_id(user.id) is None:
                    webhook_url = Users.get_user_webhook_url_by_id(user.id)
                    if webhook_url:
                        post_webhook(
                            webhook_url,
                            f"{title} - {request.app.state.config.WEBUI_URL}/c/{metadata['chat_id']}\n\n{content}",
                            {
                                "action": "chat",
                                "message": content,
                                "title": title,
                                "url": f"{request.app.state.config.WEBUI_URL}/c/{metadata['chat_id']}",
                            },
                        )

                await event_emitter(
                    {
                        "type": "chat:completion",
                        "data": data,
                    }
                )

                await background_tasks_handler()
            except asyncio.CancelledError:
                print("Task was cancelled!")
                await event_emitter({"type": "task-cancelled"})

                if not ENABLE_REALTIME_CHAT_SAVE:
                    # Save message in the database
                    Chats.upsert_message_to_chat_by_id_and_message_id(
                        metadata["chat_id"],
                        metadata["message_id"],
                        {
                            "content": serialize_content_blocks(content_blocks),
                        },
                    )

            if response.background is not None:
                await response.background()

        # background_tasks.add_task(post_response_handler, response, events)
        task_id, _ = create_task(post_response_handler(response, events))
        return {"status": True, "task_id": task_id}

    else:

        # Fallback to the original response
        async def stream_wrapper(original_generator, events):
            def wrap_item(item):
                return f"data: {item}\n\n"

            for event in events:
                yield wrap_item(json.dumps(event))

            async for data in original_generator:
                yield data

        return StreamingResponse(
            stream_wrapper(response.body_iterator, events),
            headers=dict(response.headers),
            background=response.background,
        )