refactor:Replacement network library

[lqxhub]

去掉libevent依赖, 重写网络库, 目前检查format还有问题, 等明天有时间再看

还有两个地方可能是有风险的

1. 直接使用 fd 作为了 client的唯一ID
2. 在初始化 client的时候,使用了模板构造函数, 这样可能导致通用性不好, 比如 PClient 如果修改了, 可能导致 初始化失败. https://github.com/OpenAtomFoundation/pikiwidb/pull/349/files#diff-2fe737c7212297d7ce5a3812df52450f0af5dacb22954ff20bd3acd673fc5954R31-R47

Summary by CodeRabbit

• 新功能

  • 引入了 KqueueEvent 类，提供基于 Kqueue 的事件处理系统，提升网络连接的异步I/O操作效率。
  • 新增 BaseEvent 和 EpollEvent 类，增强事件和套接字管理功能。
  • 扩展了 ClientSocket 类，添加了 Connect 方法以建立非阻塞TCP连接。
  • UnboundedBuffer 类新增了 ToString() 方法，方便获取和清空缓冲区内容。
  • 引入了 ListenSocket 类，用于处理传入连接。

• 文档

  • 更新了 CMakeLists.txt，设置了C++标准为20，调整项目配置。

• 重构

  • 在 src/config_parser.cc 和 src/config_parser.h 中引入了 pikiwidb 命名空间，组织代码结构。
  • 修改了 CmdThreadPoolTask 类的构造函数，使其为 explicit。

• 样式

  • 评论掉了不再使用或已实现的代码段。

• 杂项

  • 在 config.h 文件中引入了平台特定的宏定义。

[coderabbitai[bot]]

Walkthrough

这次更改涉及多个文件，主要集中在PClient类的重构、CMake配置的更新、以及事件处理和套接字管理的增强。许多不再使用的功能被注释掉，同时引入了新的库和头文件。类的构造函数和成员函数进行了调整，并新增了命名空间以优化代码组织。整体结构更加清晰，异步处理能力得到了提升。

Changes

文件路径	更改摘要
CMakeLists.txt	添加-Wno-restrict标志，移除libevent.cmake，添加llhttp.cmake
src/client.cc, .h	修改和注释掉PClient类中与数据包处理和连接管理相关的代码
src/cmd_raft.cc	注释掉对"net/event_loop.h"的包含
src/cmd_thread_pool.h	将CmdThreadPoolTask的构造函数改为显式
src/common.h	包含"unbounded_buffer.h"，注释掉UnboundedBuffer类的声明
src/config.h	修改包含文件路径
src/config_parser.cc, .h	将ConfigParser类包裹在pikiwidb命名空间中
src/io_thread_pool.cc, .h	注释掉IOThreadPool和WorkIOThreadPool类及其成员方法
src/net/CMakeLists.txt	更新CMake配置，设置C++标准为20，调整库链接
src/net/base_event.h	添加BaseEvent类及其构造函数、虚函数和成员函数
src/net/base_socket.cc, .h	增强BaseSocket类，增加多种套接字操作方法
src/net/callback_function.h	引入与网络事件处理相关的概念和函数
src/net/client_socket.cc, .h	扩展ClientSocket类，添加连接方法和失败回调函数
src/net/config.h	引入条件编译指令，定义平台特定宏
src/net/epoll_event.cc, .h	添加EpollEvent类，处理epoll事件，包括初始化、添加、删除和轮询
src/net/kqueue_event.cc	引入KqueueEvent类，实现Kqueue事件处理系统

Poem

代码如歌，蜕变如舞，
连接处理，更加稳固。
事件流转，轻松自如，
编译配置，焕然一新。
代码的兔子，欢快跳跃，
迎接变化，无畏无惧。
🐇✨

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[panlei-coder]

@Tangruilin

[Issues-translate-bot]

Bot detected the issue body's language is not English, translate it automatically.

---

@Tangruilin

[panlei-coder]

我在本地跑了一下，好像建立客户端连接后输出的信息没有处理好

[happy-v587]

问题

client 退出会引起 Segmentation fault: 11

原因是使用了空指针

修复

先 close 后 erase

不再报错

[Issues-translate-bot]

Bot detected the issue body's language is not English, translate it automatically.

---

Client exit will cause Segmentation fault: 11

The reason is the use of a null pointer

[lqxhub]

问题

client 退出会引起 Segmentation fault: 11

原因是使用了空指针

修复

先 close 后 erase

不再报错 多谢, 万万没想到是这里的问题😅

[Issues-translate-bot]

Bot detected the issue body's language is not English, translate it automatically.

---

问题

client 退出会引起 Segmentation fault: 11 

原因是使用了空指针 

修复

先 close 后 erase 

不再报错  多谢, 万万没想到是这里的问题😅

[happy-v587]

还没处理完，go test时还有问题，我继续看下

[Issues-translate-bot]

Bot detected the issue body's language is not English, translate it automatically.

---

It's not finished yet. There are still problems during go test. I'll continue to look at it.