DB-GPT/dbgpt/component.py
Fangyin Cheng 9502251c08
feat(core): AWEL flow 2.0 backend code (#1879)
Co-authored-by: yhjun1026 <460342015@qq.com>
2024-08-23 14:57:54 +08:00

330 lines
11 KiB
Python

"""Component module for dbgpt.
Manages the lifecycle and registration of components.
"""
from __future__ import annotations
import asyncio
import atexit
import logging
import sys
import threading
from abc import ABC, abstractmethod
from enum import Enum
from typing import TYPE_CHECKING, Dict, Optional, Type, TypeVar, Union
from dbgpt.util import AppConfig
from dbgpt.util.annotations import PublicAPI
# Checking for type hints during runtime
if TYPE_CHECKING:
from fastapi import FastAPI
logger = logging.getLogger(__name__)
class LifeCycle:
"""This class defines hooks for lifecycle events of a component.
Execution order of lifecycle hooks:
1. on_init
2. before_start(async_before_start)
3. after_start(async_after_start)
4. before_stop(async_before_stop)
"""
def on_init(self):
"""Called when the component is being initialized."""
pass
async def async_on_init(self):
"""Asynchronous version of on_init."""
pass
def before_start(self):
"""Called before the component starts.
This method is called after the component has been initialized and before it is started.
"""
pass
async def async_before_start(self):
"""Asynchronous version of before_start."""
pass
def after_start(self):
"""Called after the component has started."""
pass
async def async_after_start(self):
"""Asynchronous version of after_start."""
pass
def before_stop(self):
"""Called before the component stops."""
pass
async def async_before_stop(self):
"""Asynchronous version of before_stop."""
pass
class ComponentType(str, Enum):
WORKER_MANAGER = "dbgpt_worker_manager"
WORKER_MANAGER_FACTORY = "dbgpt_worker_manager_factory"
MODEL_CONTROLLER = "dbgpt_model_controller"
MODEL_REGISTRY = "dbgpt_model_registry"
MODEL_API_SERVER = "dbgpt_model_api_server"
MODEL_CACHE_MANAGER = "dbgpt_model_cache_manager"
PLUGIN_HUB = "dbgpt_plugin_hub"
MULTI_AGENTS = "dbgpt_multi_agents"
EXECUTOR_DEFAULT = "dbgpt_thread_pool_default"
TRACER = "dbgpt_tracer"
TRACER_SPAN_STORAGE = "dbgpt_tracer_span_storage"
RAG_GRAPH_DEFAULT = "dbgpt_rag_engine_default"
AWEL_TRIGGER_MANAGER = "dbgpt_awel_trigger_manager"
AWEL_DAG_MANAGER = "dbgpt_awel_dag_manager"
UNIFIED_METADATA_DB_MANAGER_FACTORY = "dbgpt_unified_metadata_db_manager_factory"
CONNECTOR_MANAGER = "dbgpt_connector_manager"
AGENT_MANAGER = "dbgpt_agent_manager"
RESOURCE_MANAGER = "dbgpt_resource_manager"
VARIABLES_PROVIDER = "dbgpt_variables_provider"
FILE_STORAGE_CLIENT = "dbgpt_file_storage_client"
_EMPTY_DEFAULT_COMPONENT = "_EMPTY_DEFAULT_COMPONENT"
@PublicAPI(stability="beta")
class BaseComponent(LifeCycle, ABC):
"""Abstract Base Component class. All custom components should extend this."""
name = "base_dbgpt_component"
def __init__(self, system_app: Optional[SystemApp] = None):
if system_app is not None:
self.init_app(system_app)
@abstractmethod
def init_app(self, system_app: SystemApp):
"""Initialize the component with the main application.
This method needs to be implemented by every component to define how it integrates
with the main system app.
"""
@classmethod
def get_instance(
cls: Type[T],
system_app: SystemApp,
default_component=_EMPTY_DEFAULT_COMPONENT,
or_register_component: Optional[Type[T]] = None,
*args,
**kwargs,
) -> T:
"""Get the current component instance.
Args:
system_app (SystemApp): The system app
default_component : The default component instance if not retrieve by name
or_register_component (Type[T]): The new component to register if not retrieve by name
Returns:
T: The component instance
"""
# Check for keyword argument conflicts
if "default_component" in kwargs:
raise ValueError(
"default_component argument given in both fixed and **kwargs"
)
if "or_register_component" in kwargs:
raise ValueError(
"or_register_component argument given in both fixed and **kwargs"
)
kwargs["default_component"] = default_component
kwargs["or_register_component"] = or_register_component
return system_app.get_component(
cls.name,
cls,
*args,
**kwargs,
)
T = TypeVar("T", bound=BaseComponent)
@PublicAPI(stability="beta")
class SystemApp(LifeCycle):
"""Main System Application class that manages the lifecycle and registration of components."""
def __init__(
self,
asgi_app: Optional["FastAPI"] = None,
app_config: Optional[AppConfig] = None,
) -> None:
self.components: Dict[
str, BaseComponent
] = {} # Dictionary to store registered components.
self._asgi_app = asgi_app
self._app_config = app_config or AppConfig()
self._stop_event = threading.Event()
self._stop_event.clear()
self._build()
@property
def app(self) -> Optional["FastAPI"]:
"""Returns the internal ASGI app."""
return self._asgi_app
@property
def config(self) -> AppConfig:
"""Returns the internal AppConfig."""
return self._app_config
def register(self, component: Type[T], *args, **kwargs) -> T:
"""Register a new component by its type.
Args:
component (Type[T]): The component class to register
Returns:
T: The instance of registered component
"""
instance = component(self, *args, **kwargs)
self.register_instance(instance)
return instance
def register_instance(self, instance: T) -> T:
"""Register an already initialized component.
Args:
instance (T): The component instance to register
Returns:
T: The instance of registered component
"""
name = instance.name
if isinstance(name, ComponentType):
name = name.value
if name in self.components:
raise RuntimeError(
f"Componse name {name} already exists: {self.components[name]}"
)
logger.info(f"Register component with name {name} and instance: {instance}")
self.components[name] = instance
instance.init_app(self)
return instance
def get_component(
self,
name: Union[str, ComponentType],
component_type: Type,
default_component=_EMPTY_DEFAULT_COMPONENT,
or_register_component: Optional[Type[T]] = None,
*args,
**kwargs,
) -> T:
"""Retrieve a registered component by its name and type.
Args:
name (Union[str, ComponentType]): Component name
component_type (Type[T]): The type of current retrieve component
default_component : The default component instance if not retrieve by name
or_register_component (Type[T]): The new component to register if not retrieve by name
Returns:
T: The instance retrieved by component name
"""
if isinstance(name, ComponentType):
name = name.value
component = self.components.get(name)
if not component:
if or_register_component:
return self.register(or_register_component, *args, **kwargs)
if default_component != _EMPTY_DEFAULT_COMPONENT:
return default_component
raise ValueError(f"No component found with name {name}")
if not isinstance(component, component_type):
raise TypeError(f"Component {name} is not of type {component_type}")
return component
def on_init(self):
"""Invoke the on_init hooks for all registered components."""
for _, v in self.components.items():
v.on_init()
async def async_on_init(self):
"""Asynchronously invoke the on_init hooks for all registered components."""
tasks = [v.async_on_init() for _, v in self.components.items()]
await asyncio.gather(*tasks)
def before_start(self):
"""Invoke the before_start hooks for all registered components."""
for _, v in self.components.items():
v.before_start()
async def async_before_start(self):
"""Asynchronously invoke the before_start hooks for all registered components."""
tasks = [v.async_before_start() for _, v in self.components.items()]
await asyncio.gather(*tasks)
def after_start(self):
"""Invoke the after_start hooks for all registered components."""
for _, v in self.components.items():
v.after_start()
async def async_after_start(self):
"""Asynchronously invoke the after_start hooks for all registered components."""
tasks = [v.async_after_start() for _, v in self.components.items()]
await asyncio.gather(*tasks)
def before_stop(self):
"""Invoke the before_stop hooks for all registered components."""
if self._stop_event.is_set():
return
for _, v in self.components.items():
try:
v.before_stop()
except Exception as e:
pass
self._stop_event.set()
async def async_before_stop(self):
"""Asynchronously invoke the before_stop hooks for all registered components."""
tasks = [v.async_before_stop() for _, v in self.components.items()]
await asyncio.gather(*tasks)
def _build(self):
"""Integrate lifecycle events with the internal ASGI app if available."""
if not self.app:
self._register_exit_handler()
return
from dbgpt.util.fastapi import register_event_handler
async def startup_event():
"""ASGI app startup event handler."""
async def _startup_func():
try:
await self.async_after_start()
except Exception as e:
logger.error(f"Error starting system app: {e}")
sys.exit(1)
asyncio.create_task(_startup_func())
self.after_start()
async def shutdown_event():
"""ASGI app shutdown event handler."""
await self.async_before_stop()
self.before_stop()
register_event_handler(self.app, "startup", startup_event)
register_event_handler(self.app, "shutdown", shutdown_event)
def _register_exit_handler(self):
"""Register an exit handler to stop the system app."""
atexit.register(self.before_stop)