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MetaGPT源码：Memory 类

这段代码定义了一个名为 Memory 的类，用于存储和管理消息(Message)对象。Memory 提供了多种操作消息的功能，包括添加单条或批量消息、按角色或内容筛选消息、删除最新消息、清空存储、按触发动作获取消息等。消息存储在 storage 列表中，同时使用 index 字典对消息的触发动作(cause_by)进行索引，以支持快速检索。通过这些方法，Memory 类能够高效地管理消息流，实现对消息的组织、查询和更新，适用于需要处理复杂消息交互的场景。

from collections import defaultdict
from typing import DefaultDict, Iterable, Setfrom pydantic import BaseModel, Field, SerializeAsAnyfrom metagpt.const import IGNORED_MESSAGE_ID
from metagpt.schema import Message
from metagpt.utils.common import any_to_str, any_to_str_setclass Memory(BaseModel):"""The most basic memory: super-memory"""storage: list[SerializeAsAny[Message]] = []index: DefaultDict[str, list[SerializeAsAny[Message]]] = Field(default_factory=lambda: defaultdict(list))ignore_id: bool = Falsedef add(self, message: Message):"""Add a new message to storage, while updating the index"""if self.ignore_id:message.id = IGNORED_MESSAGE_IDif message in self.storage:returnself.storage.append(message)if message.cause_by:self.index[message.cause_by].append(message)def add_batch(self, messages: Iterable[Message]):for message in messages:self.add(message)def get_by_role(self, role: str) -> list[Message]:"""Return all messages of a specified role"""return [message for message in self.storage if message.role == role]def get_by_content(self, content: str) -> list[Message]:"""Return all messages containing a specified content"""return [message for message in self.storage if content in message.content]def delete_newest(self) -> "Message":"""delete the newest message from the storage"""if len(self.storage) > 0:newest_msg = self.storage.pop()if newest_msg.cause_by and newest_msg in self.index[newest_msg.cause_by]:self.index[newest_msg.cause_by].remove(newest_msg)else:newest_msg = Nonereturn newest_msgdef delete(self, message: Message):"""Delete the specified message from storage, while updating the index"""if self.ignore_id:message.id = IGNORED_MESSAGE_IDself.storage.remove(message)if message.cause_by and message in self.index[message.cause_by]:self.index[message.cause_by].remove(message)def clear(self):"""Clear storage and index"""self.storage = []self.index = defaultdict(list)def count(self) -> int:"""Return the number of messages in storage"""return len(self.storage)def try_remember(self, keyword: str) -> list[Message]:"""Try to recall all messages containing a specified keyword"""return [message for message in self.storage if keyword in message.content]def get(self, k=0) -> list[Message]:"""Return the most recent k memories, return all when k=0"""return self.storage[-k:]def find_news(self, observed: list[Message], k=0) -> list[Message]:"""find news (previously unseen messages) from the most recent k memories, from all memories when k=0"""already_observed = self.get(k)news: list[Message] = []for i in observed:if i in already_observed:continuenews.append(i)return newsdef get_by_action(self, action) -> list[Message]:"""Return all messages triggered by a specified Action"""index = any_to_str(action)return self.index[index]def get_by_actions(self, actions: Set) -> list[Message]:"""Return all messages triggered by specified Actions"""rsp = []indices = any_to_str_set(actions)for action in indices:if action not in self.index:continuersp += self.index[action]return rsp

2024-12-11 22:38:16.092 | INFO | metagpt.const:get_metagpt_package_root:21 - Package root set to d:\llm\metagpt

例子

以下是一些例子，帮助你理解 Memory 类及其方法的使用：

1. 创建 Memory 对象并添加消息

from metagpt.schema import Message# 创建 Memory 实例
memory = Memory()# 创建一个 Message 实例
message1 = Message(role="user", content="Hello!", cause_by=None, id="1")
message2 = Message(role="assistant", content="Hi there!", cause_by="1", id="2")# 添加消息
memory.add(message1)
memory.add(message2)print("Storage:", memory.storage)

Storage: [user: Hello!, assistant: Hi there!]

2. 批量添加消息

messages = [Message(role="user", content="How are you?", cause_by=None, id="3"),Message(role="assistant", content="I'm fine, thank you!", cause_by="3", id="4"),
]memory.add_batch(messages)print("Storage after batch add:", memory.storage)

Storage after batch add: [user: Hello!, assistant: Hi there!, user: How are you?, assistant: I'm fine, thank you!]

3. 按角色获取消息

user_messages = memory.get_by_role("user")
print("Messages from user:", user_messages)

Messages from user: [user: Hello!, user: How are you?]

4. 按内容查找消息

matching_messages = memory.get_by_content("fine")
print("Messages containing 'fine':", matching_messages)

Messages containing 'fine': [assistant: I'm fine, thank you!]

5. 删除最新消息

newest_message = memory.delete_newest()
print("Deleted newest message:", newest_message)
print("Storage after deletion:", memory.storage)

Deleted newest message: assistant: I'm fine, thank you!
Storage after deletion: [user: Hello!, assistant: Hi there!, user: How are you?]

6. 清空存储

memory.clear()
print("Storage after clear:", memory.storage)

Storage after clear: []

7. 按触发动作查找消息

# 添加一些消息
memory.add(Message(role="assistant", content="Task completed!", cause_by="action_1", id="5"))
memory.add(Message(role="assistant", content="Another task completed!", cause_by="action_2", id="6"))# 根据动作获取消息
action_messages = memory.get_by_action("action_1")
print("Messages triggered by 'action_1':", action_messages)

Messages triggered by 'action_1': [assistant: Task completed!]

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