boost asio 异步实现tcp通讯
---恢复内容开始---
一、前言
boost asio可算是一个简单易用,功能又强大可跨平台的C++通讯库,效率也表现的不错,linux环境是epoll实现的,而windows环境是iocp实现的。而tcp通讯是项目当中经常用到通讯方式之一,实现的方法有各式各样,因此总结一套适用于自己项目的方法是很有必要,很可能下一个项目直接套上去就可以用了。
二、实现思路
1.通讯包数据结构
Tag:检查数据包是否合法,具体会在下面讲解;
Length:描述Body的长度;
Command:表示数据包的类型,0表示心跳包(长连接需要心跳来检测连接是否正常),1表示注册包(客户端连接上服务器之后要将相关信息注册给服务器),2表示业务消息包;
business_type:业务消息包类型,服务器会根据业务消息包类型将数据路由到对应的客户端(客户端是有业务类型分类的);
app_id:客户端唯一标识符;
Data:消息数据;
2.连接对象
客户端连接上服务器之后,双方都会产生一个socket连接对象,通过这个对象可以收发数据,因此我定义为socket_session。
//socket_session.h
- #pragma once
- #include <iostream>
- #include <list>
- #include <hash_map>
- #include <boost/bind.hpp>
- #include <boost/asio.hpp>
- #include <boost/shared_ptr.hpp>
- #include <boost/make_shared.hpp>
- #include <boost/thread.hpp>
- #include <boost/thread/mutex.hpp>
- #include <boost/enable_shared_from_this.hpp>
- #include <firebird/log/logger_log4.hpp>
- #include <firebird/detail/config.hpp>
- #include <firebird/socket_utils/message_archive.hpp>
- using boost::asio::ip::tcp;
- namespace firebird{
- enum command{ heartbeat = 0, regist, normal};
- const std::string tag = "KDS";
- class FIREBIRD_DECL socket_session;
- typedef boost::shared_ptr<socket_session> socket_session_ptr;
- class FIREBIRD_DECL socket_session:
- public boost::enable_shared_from_this<socket_session>,
- private boost::noncopyable
- {
- public:
- typedef boost::function<void(socket_session_ptr)> close_callback;
- typedef boost::function<void(
- const boost::system::error_code&,
- socket_session_ptr, message&)> read_data_callback;
- socket_session(boost::asio::io_service& io_service);
- ~socket_session(void);
- DWORD id() { return m_id; }
- WORD get_business_type(){ return m_business_type; }
- void set_business_type(WORD type) { m_business_type = type; }
- DWORD get_app_id(){ return m_app_id; }
- void set_app_id(DWORD app_id) { m_app_id = app_id; }
- std::string& get_remote_addr() { return m_name; }
- void set_remote_addr(std::string& name) { m_name = name; }
- tcp::socket& socket() { return m_socket; }
- void installCloseCallBack(close_callback cb){ close_cb = cb; }
- void installReadDataCallBack(read_data_callback cb) { read_data_cb = cb; }
- void start();
- void close();
- void async_write(const std::string& sMsg);
- void async_write(message& msg);
- bool is_timeout();
- void set_op_time(){std::time(&m_last_op_time);}
- private:
- static boost::detail::atomic_count m_last_id;
- DWORD m_id;
- WORD m_business_type;
- DWORD m_app_id;
- std::string m_name;
- boost::array<char, 7> sHeader;
- std::string sBody;
- tcp::socket m_socket;
- boost::asio::io_service& m_io_service;
- std::time_t m_last_op_time;
- close_callback close_cb;
- read_data_callback read_data_cb;
- //发送消息
- void handle_write(const boost::system::error_code& e,
- std::size_t bytes_transferred, std::string* pmsg);
- //读消息头
- void handle_read_header(const boost::system::error_code& error);
- //读消息体
- void handle_read_body(const boost::system::error_code& error);
- void handle_close();
- };
- }
这里注意的是,定义了一个tag="KDS",目的是为了检查收到的数据包是否有效,每一个数据包前3个字节不为“KDS”,那么就认为是非法的请求包,你也可以定义tag等于其它字符串,只要按协议发包就正常,当然这是比较简单的数据包检查方法了。比较严谨的方法是双方使用哈希算法来检查的,怎么做,这里先不做详解。
//socket_session.cpp
- #include "socket_session.h"
- namespace firebird{
- boost::detail::atomic_count socket_session::m_last_id(0);
- socket_session::socket_session(boost::asio::io_service& io_srv)
- :m_io_service(io_srv), m_socket(io_srv),
- m_business_type(0), m_app_id(0)
- {
- m_id = ++socket_session::m_last_id;
- }
- socket_session::~socket_session(void)
- {
- m_socket.close();
- }
- void socket_session::start()
- {
- m_socket.set_option(boost::asio::ip::tcp::acceptor::linger(true, 0));
- m_socket.set_option(boost::asio::socket_base::keep_alive(true));
- std::time(&m_last_op_time);
- const boost::system::error_code error;
- handle_read_header(error);
- }
- void socket_session::handle_close()
- {
- try{
- m_socket.close();
- close_cb(shared_from_this());
- }
- catch(std::exception& e)
- {
- LOG4CXX_ERROR(firebird_log, KDS_CODE_INFO << "连接远程地址:[" << get_remote_addr() << "],socket异常:[" << e.what() << "]");
- }
- catch(...)
- {
- LOG4CXX_ERROR(firebird_log, KDS_CODE_INFO << "连接远程地址:[" << get_remote_addr() << "],socket异常:[未知异常]");
- }
- }
- void socket_session::close()
- {
- //由于回调中有加锁的情况,必须提交到另外一个线程去做,不然会出现死锁
- m_io_service.post(boost::bind(&socket_session::handle_close, shared_from_this()));
- }
- static int connection_timeout = 60;
- bool socket_session::is_timeout()
- {
- std::time_t now;
- std::time(&now);
- return now - m_last_op_time > connection_timeout;
- }
- //读消息头
- void socket_session::handle_read_header(const boost::system::error_code& error)
- {
- LOG4CXX_DEBUG(firebird_log, KDS_CODE_INFO << "enter.");
- try{
- if(error)
- {
- LOG4CXX_ERROR(firebird_log, KDS_CODE_INFO << "连接远程地址:[" << get_remote_addr() << "],socket异常:[" << error.message().c_str() << "]");
- close();
- return;
- }
- std::string data;
- data.swap(sBody);
- boost::asio::async_read(m_socket,
- boost::asio::buffer(sHeader),
- boost::bind(&socket_session::handle_read_body, shared_from_this(),
- boost::asio::placeholders::error));
- if (data.length() > 0 && data != "")
- {//读到数据回调注册的READ_DATA函数
- message msg;
- message_iarchive(msg, data);
- read_data_cb(error, shared_from_this(), msg);
- }
- }
- catch(std::exception& e)
- {
- LOG4CXX_ERROR(firebird_log, KDS_CODE_INFO << "连接远程地址:[" << get_remote_addr() << "],socket异常:[" << e.what() << "]");
- close();
- }
- catch(...)
- {
- LOG4CXX_ERROR(firebird_log, KDS_CODE_INFO << "连接远程地址:[" << get_remote_addr() << "],socket异常:[未知异常]");
- close();
- }
- }
- //读消息体
- void socket_session::handle_read_body(const boost::system::error_code& error)
- {
- LOG4CXX_DEBUG(firebird_log, KDS_CODE_INFO << "enter.");
- try{
- if(error)
- {
- LOG4CXX_ERROR(firebird_log, KDS_CODE_INFO << "连接远程地址:[" << get_remote_addr() << "],socket异常:[" << error.message().c_str() << "]");
- close();
- return;
- }
- if (tag.compare(0, tag.length(), sHeader.data(), 0, tag.length()))
- {
- LOG4CXX_ERROR(firebird_log, KDS_CODE_INFO << "连接远程地址:[" << get_remote_addr() << "],socket异常:[这是个非法连接!]");
- close();
- return;
- }
- DWORD dwLength = 0;
- char* len = (char*)&dwLength;
- memcpy(len, &sHeader[tag.length()], sizeof(dwLength));
- sBody.resize(dwLength);
- char* pBody = &sBody[0];
- boost::asio::async_read(m_socket,
- boost::asio::buffer(pBody, dwLength),
- boost::bind(&socket_session::handle_read_header, shared_from_this(),
- boost::asio::placeholders::error));
- }
- catch(std::exception& e)
- {
- LOG4CXX_ERROR(firebird_log, KDS_CODE_INFO << "连接远程地址:[" << get_remote_addr() << "],socket异常:[" << e.what() << "]");
- close();
- }
- catch(...)
- {
- LOG4CXX_ERROR(firebird_log, KDS_CODE_INFO << "连接远程地址:[" << get_remote_addr() << "],socket异常:[未知异常]");
- close();
- }
- }
- void socket_session::handle_write(const boost::system::error_code& error,
- std::size_t bytes_transferred, std::string* pmsg)
- {
- //数据发送成功就销毁
- if (pmsg != NULL)
- {
- delete pmsg;
- }
- if(error)
- {
- LOG4CXX_ERROR(firebird_log, KDS_CODE_INFO << "连接远程地址:[" << get_remote_addr() << "],socket异常:[" << error.message().c_str() << "]");
- close();
- return;
- }
- }
- void socket_session::async_write(const std::string& sMsg)
- {
- LOG4CXX_DEBUG(firebird_log, KDS_CODE_INFO << "enter.")
- try
- {
- DWORD dwLength = sMsg.size();
- char* pLen = (char*)&dwLength;
- //由于是异步发送,要保证数据发送完整时,才把数据销毁
- std::string* msg = new std::string();
- msg->append(tag);
- msg->append(pLen, sizeof(dwLength));
- msg->append(sMsg);
- boost::asio::async_write(m_socket,boost::asio::buffer(*msg, msg->size()),
- boost::bind(&socket_session::handle_write, shared_from_this(),
- boost::asio::placeholders::error, boost::asio::placeholders::bytes_transferred,
- msg));
- }
- catch(std::exception& e)
- {
- LOG4CXX_ERROR(firebird_log, KDS_CODE_INFO << "连接远程地址:[" << get_remote_addr() << "],socket异常:[" << e.what() << "]");
- close();
- }
- catch(...)
- {
- LOG4CXX_ERROR(firebird_log, KDS_CODE_INFO << "连接远程地址:[" << get_remote_addr() << "],socket异常:[未知异常]");
- close();
- }
- }
- void socket_session::async_write(message& msg)
- {
- std::string data;
- message_oarchive(data, msg);
- async_write(data);
- }
- }
接受数据时,socket_session会先读取7个字节的head,比较前3个字节“KDS”,然后取得4个字节的Length,再读出Length长度的数据,最后将该数据传给read_data_cb回调函数处理,read_data_cb回调函数是在外部注册的。
3.连接管理器
对于服务器来说,它同时服务多个客户端,为了有效的管理,因此需要一个连接管理器,我定义为session_manager。session_manager主要是对socket_session的增删改查,和有效性检查。
//session_manager.h
- #pragma once
- #include "socket_session.h"
- #include "filter_container.h"
- #include <boost/date_time/posix_time/posix_time.hpp>
- #include <boost/multi_index_container.hpp>
- #include <boost/multi_index/member.hpp>
- #include <boost/multi_index/ordered_index.hpp>
- #include <boost/typeof/typeof.hpp>
- #include <boost/random.hpp>
- #include <boost/pool/detail/singleton.hpp>
- namespace firebird{
- template<typename T>
- class var_gen_wraper
- {
- public:
- var_gen_wraper(): gen(boost::mt19937((boost::int32_t)std::time(0)),
- boost::uniform_smallint<>(1, 100)) {}
- typename T::result_type operator() () { return gen(); }
- private:
- T gen;
- };
- struct session_stu
- {
- DWORD id;
- WORD business_type;
- std::string address;
- DWORD app_id;
- socket_session_ptr session;
- };
- struct sid{};
- struct sbusiness_type{};
- struct saddress{};
- struct sapp_id{};
- enum session_idx_member{ session_id = 0, session_business_type, session_address, app_id};
- #define CLIENT 0
- #define SERVER 1
- typedef boost::multi_index::multi_index_container<
- session_stu,
- boost::multi_index::indexed_by<
- boost::multi_index::ordered_unique<
- boost::multi_index::tag<sid>, BOOST_MULTI_INDEX_MEMBER(session_stu, DWORD, id)>,
- boost::multi_index::ordered_non_unique<
- boost::multi_index::tag<sbusiness_type>, BOOST_MULTI_INDEX_MEMBER(session_stu, WORD, business_type)>,
- boost::multi_index::ordered_non_unique<
- boost::multi_index::tag<saddress>, BOOST_MULTI_INDEX_MEMBER(session_stu, std::string, address)>,
- boost::multi_index::ordered_non_unique<
- boost::multi_index::tag<sapp_id>, BOOST_MULTI_INDEX_MEMBER(session_stu, DWORD, app_id)>
- >
- > session_set;
- #define MULTI_MEMBER_CON(Tag) boost::multi_index::index<session_set,Tag>::type&
- #define MULTI_MEMBER_ITR(Tag) boost::multi_index::index<session_set,Tag>::type::iterator
- struct is_business_type {
- is_business_type(WORD type)
- :m_type(type)
- {
- }
- bool operator()(const session_stu& s)
- {
- return (s.business_type == m_type);
- }
- WORD m_type;
- };
- class session_manager
- {
- public:
- typedef boost::shared_lock<boost::shared_mutex> readLock;
- typedef boost:: unique_lock<boost::shared_mutex> writeLock;
- session_manager(boost::asio::io_service& io_srv, int type, int expires_time);
- ~session_manager();
- void add_session(socket_session_ptr p);
- void update_session(socket_session_ptr p);
- template<typename Tag, typename Member>
- void del_session(Member m)
- {
- writeLock lock(m_mutex);
- if (m_sessions.empty())
- {
- return ;
- }
- MULTI_MEMBER_CON(Tag) idx = boost::multi_index::get<Tag>(m_sessions);
- //BOOST_AUTO(idx, boost::multi_index::get<Tag>(m_sessions));
- BOOST_AUTO(iter, idx.find(m));
- if (iter != idx.end())
- {
- idx.erase(iter);
- }
- }
- //获取容器中的第一个session
- template<typename Tag, typename Member>
- socket_session_ptr get_session(Member m)
- {
- readLock lock(m_mutex);
- if (m_sessions.empty())
- {
- return socket_session_ptr();
- }
- MULTI_MEMBER_CON(Tag) idx = boost::multi_index::get<Tag>(m_sessions);
- BOOST_AUTO(iter, idx.find(m));
- return iter != boost::end(idx) ? iter->session : socket_session_ptr();
- }
- //随机获取容器中的session
- template<typename Tag>
- socket_session_ptr get_session_by_business_type(WORD m)
- {
- typedef filter_container<is_business_type, MULTI_MEMBER_ITR(Tag)> FilterContainer;
- readLock lock(m_mutex);
- if (m_sessions.empty())
- {
- return socket_session_ptr();
- }
- MULTI_MEMBER_CON(Tag) idx = boost::multi_index::get<Tag>(m_sessions);
- //对容器的元素条件过滤
- is_business_type predicate(m);
- FilterContainer fc(predicate, idx.begin(), idx.end());
- FilterContainer::FilterIter iter = fc.begin();
- if (fc.begin() == fc.end())
- {
- return socket_session_ptr();
- }
- //typedef boost::variate_generator<boost::mt19937, boost::uniform_smallint<>> var_gen;
- //typedef boost::details::pool::singleton_default<var_gen_wraper<var_gen>> s_var_gen;
- ////根据随机数产生session
- //s_var_gen::object_type &gen = s_var_gen::instance();
- //int step = gen() % fc.szie();
- int step = m_next_session % fc.szie();
- ++m_next_session;
- for (int i = 0; i < step; ++i)
- {
- iter++;
- }
- return iter != fc.end() ? iter->session : socket_session_ptr();
- }
- //根据类型和地址取session
- template<typename Tag>
- socket_session_ptr get_session_by_type_ip(WORD m, std::string& ip)
- {
- typedef filter_container<is_business_type, MULTI_MEMBER_ITR(Tag)> FilterContainer;
- readLock lock(m_mutex);
- if (m_sessions.empty())
- {
- return socket_session_ptr();
- }
- MULTI_MEMBER_CON(Tag) idx = boost::multi_index::get<Tag>(m_sessions);
- //对容器的元素条件过滤
- is_business_type predicate(m);
- FilterContainer fc(predicate, idx.begin(), idx.end());
- FilterContainer::FilterIter iter = fc.begin();
- if (fc.begin() == fc.end())
- {
- return socket_session_ptr();
- }
- while (iter != fc.end())
- {
- if (iter->session->get_remote_addr().find(ip) != std::string::npos)
- {
- break;
- }
- iter++;
- }
- return iter != fc.end() ? iter->session : socket_session_ptr();
- }
- //根据类型和app_id取session
- template<typename Tag>
- socket_session_ptr get_session_by_type_appid(WORD m, DWORD app_id)
- {
- typedef filter_container<is_business_type, MULTI_MEMBER_ITR(Tag)> FilterContainer;
- readLock lock(m_mutex);
- if (m_sessions.empty())
- {
- return socket_session_ptr();
- }
- MULTI_MEMBER_CON(Tag) idx = boost::multi_index::get<Tag>(m_sessions);
- //对容器的元素条件过滤
- is_business_type predicate(m);
- FilterContainer fc(predicate, idx.begin(), idx.end());
- FilterContainer::FilterIter iter = fc.begin();
- if (fc.begin() == fc.end())
- {
- return socket_session_ptr();
- }
- while (iter != fc.end())
- {
- if (iter->session->get_app_id() == app_id)
- {
- break;
- }
- iter++;
- }
- return iter != fc.end() ? iter->session : socket_session_ptr();
- }
- private:
- int m_type;
- int m_expires_time;
- boost::asio::io_service& m_io_srv;
- boost::asio::deadline_timer m_check_tick;
- boost::shared_mutex m_mutex;
- unsigned short m_next_session;
- session_set m_sessions;
- void check_connection();
- };
- }
这里主要用到了boost的multi_index容器,这是一个非常有用方便的容器,可实现容器的多列索引,具体的使用方法,在这里不多做详解。
//session_manager.cpp
- #include "session_manager.h"
- namespace firebird{
- session_manager::session_manager(boost::asio::io_service& io_srv, int type, int expires_time)
- :m_io_srv(io_srv), m_check_tick(io_srv), m_type(type), m_expires_time(expires_time),m_next_session(0)
- {
- check_connection();
- }
- session_manager::~session_manager()
- {
- }
- //检查服务器所有session的连接状态
- void session_manager::check_connection()
- {
- try{
- writeLock lock(m_mutex);
- session_set::iterator iter = m_sessions.begin();
- while (iter != m_sessions.end())
- {
- LOG4CXX_DEBUG(firebird_log, "循环");
- if (CLIENT == m_type)//客户端的方式
- {
- if (!iter->session->socket().is_open())//已断开,删除已断开的连接
- {
- LOG4CXX_INFO(firebird_log, "重新连接[" << iter->address << "]");
- iter->session->close(); //通过关闭触发客户端重连
- }
- else{//连接中,发送心跳
- message msg;
- msg.command = heartbeat;
- msg.business_type = iter->session->get_business_type();
- msg.app_id = iter->session->get_app_id();
- msg.data() = "H";
- iter->session->async_write(msg);
- iter->session->set_op_time();
- }
- }
- else if (SERVER == m_type)//服务器的方式
- {
- if (!iter->session->socket().is_open())//已断开,删除已断开的连接
- {
- LOG4CXX_INFO(firebird_log, KDS_CODE_INFO << "删除已关闭的session:[" << iter->session->get_remote_addr() << "]");
- iter = m_sessions.erase(iter);
- continue;
- }
- else{//连接中,设定每30秒检查一次
- if (iter->session->is_timeout()) //如果session已长时间没操作,则关闭
- {
- LOG4CXX_INFO(firebird_log, KDS_CODE_INFO << "删除已超时的session:[" << iter->session->get_remote_addr() << "]");
- iter->session->close();//通过关闭触发删除session
- }
- }
- iter->session->set_op_time();
- }
- else{
- LOG4CXX_ERROR(firebird_log, KDS_CODE_INFO << "unknown manager_type");
- }
- ++iter;
- }
- LOG4CXX_DEBUG(firebird_log, "定时检查");
- m_check_tick.expires_from_now(boost::posix_time::seconds(m_expires_time));
- m_check_tick.async_wait(boost::bind(&session_manager::check_connection, this));
- }
- catch(std::exception& e)
- {
- LOG4CXX_ERROR(firebird_log, KDS_CODE_INFO << "[" << e.what() << "]");
- }
- catch(...)
- {
- LOG4CXX_ERROR(firebird_log, KDS_CODE_INFO << "unknown exception.");
- }
- }
- void session_manager::add_session(socket_session_ptr p)
- {
- writeLock lock(m_mutex);
- session_stu stuSession;
- stuSession.id = p->id();
- stuSession.business_type = 0;
- stuSession.address = p->get_remote_addr();
- stuSession.app_id = p->get_app_id();
- stuSession.session = p;
- m_sessions.insert(stuSession);
- }
- void session_manager::update_session(socket_session_ptr p)
- {
- writeLock lock(m_mutex);
- if (m_sessions.empty())
- {
- return ;
- }
- MULTI_MEMBER_CON(sid) idx = boost::multi_index::get<sid>(m_sessions);
- BOOST_AUTO(iter, idx.find(p->id()));
- if (iter != idx.end())
- {
- const_cast<session_stu&>(*iter).business_type = p->get_business_type();
- const_cast<session_stu&>(*iter).app_id = p->get_app_id();
- }
- }
- }
这个时候,我就可以使用id、business_type、address、app_id当做key来索引socket_session了,单使用map容器是做不到的。
还有索引时,需要的一个条件过滤器
//filter_container.h
- #pragma once
- #include <boost/iterator/filter_iterator.hpp>
- namespace firebird{
- template <class Predicate, class Iterator>
- class filter_container
- {
- public:
- typedef boost::filter_iterator<Predicate, Iterator> FilterIter;
- filter_container(Predicate p, Iterator begin, Iterator end)
- :m_begin(p, begin, end),
- m_end(p, end, end)
- {
- }
- ~filter_container() {}
- FilterIter begin() { return m_begin; }
- FilterIter end() { return m_end; }
- int szie() {
- int i = 0;
- FilterIter fi = m_begin;
- while(fi != m_end)
- {
- ++i;
- ++fi;
- }
- return i;
- }
- private:
- FilterIter m_begin;
- FilterIter m_end;
- };
- }
4.服务器端的实现
服务器我定义为server_socket_utils,拥有一个session_manager,每当accept成功得到一个socket_session时,都会将其增加到session_manager去管理,注册相关回调函数。
read_data_callback 接收到数据的回调函数
收到数据之后,也就是数据包的body部分,反序列化出command、business_type、app_id和data(我使用到了thrift),如果command==normal正常的业务包,会调用handle_read_data传入data。
close_callback 关闭socket_session触发的回调函数
根据id将该连接从session_manager中删除掉
//server_socket_utils.h
- #pragma once
- #include "socket_session.h"
- #include "session_manager.h"
- #include <boost/format.hpp>
- #include <firebird/message/message.hpp>
- namespace firebird{
- using boost::asio::ip::tcp;
- class FIREBIRD_DECL server_socket_utils
- {
- private:
- boost::asio::io_service m_io_srv;
- boost::asio::io_service::work m_work;
- tcp::acceptor m_acceptor;
- void handle_accept(socket_session_ptr session, const boost::system::error_code& error);
- void close_callback(socket_session_ptr session);
- void read_data_callback(const boost::system::error_code& e,
- socket_session_ptr session, message& msg);
- protected:
- virtual void handle_read_data(message& msg, socket_session_ptr pSession) = 0;
- public:
- server_socket_utils(int port);
- ~server_socket_utils(void);
- void start();
- boost::asio::io_service& get_io_service() { return m_io_srv; }
- session_manager m_manager;
- };
- }
//server_socket_utils.cpp
- #include "server_socket_utils.h"
- namespace firebird{
- server_socket_utils::server_socket_utils(int port)
- :m_work(m_io_srv),
- m_acceptor(m_io_srv, tcp::endpoint(tcp::v4(), port)),
- m_manager(m_io_srv, SERVER, 3)
- {
- //m_acceptor.set_option(boost::asio::ip::tcp::acceptor::reuse_address(true));
- //// 关闭连接前留0秒给客户接收数据
- //m_acceptor.set_option(boost::asio::ip::tcp::acceptor::linger(true, 0));
- //m_acceptor.set_option(boost::asio::ip::tcp::no_delay(true));
- //m_acceptor.set_option(boost::asio::socket_base::keep_alive(true));
- //m_acceptor.set_option(boost::asio::socket_base::receive_buffer_size(16384));
- }
- server_socket_utils::~server_socket_utils(void)
- {
- }
- void server_socket_utils::start()
- {
- try{
- socket_session_ptr new_session(new socket_session(m_io_srv));
- m_acceptor.async_accept(new_session->socket(),
- boost::bind(&server_socket_utils::handle_accept, this, new_session,
- boost::asio::placeholders::error));
- }
- catch(std::exception& e)
- {
- LOG4CXX_ERROR(firebird_log, KDS_CODE_INFO << "socket异常:[" << e.what() << "]");
- }
- catch(...)
- {
- LOG4CXX_ERROR(firebird_log, KDS_CODE_INFO << "socket异常:[未知异常]");
- }
- }
- void server_socket_utils::handle_accept(socket_session_ptr session, const boost::system::error_code& error)
- {
- if (!error)
- {
- try{
- socket_session_ptr new_session(new socket_session(m_io_srv));
- m_acceptor.async_accept(new_session->socket(),
- boost::bind(&server_socket_utils::handle_accept, this, new_session,
- boost::asio::placeholders::error));
- if (session != NULL)
- {
- //注册关闭回调函数
- session->installCloseCallBack(boost::bind(&server_socket_utils::close_callback, this, _1));
- //注册读到数据回调函数
- session->installReadDataCallBack(boost::bind(&server_socket_utils::read_data_callback, this, _1, _2, _3));
- boost::format fmt("%1%:%2%");
- fmt % session->socket().remote_endpoint().address().to_string();
- fmt % session->socket().remote_endpoint().port();
- session->set_remote_addr(fmt.str());
- session->start();
- m_manager.add_session(session);
- }
- }
- catch(std::exception& e)
- {
- LOG4CXX_ERROR(firebird_log, KDS_CODE_INFO << "socket异常:[" << e.what() << "]");
- }
- catch(...)
- {
- LOG4CXX_ERROR(firebird_log, KDS_CODE_INFO << "socket异常:[未知异常]");
- }
- }
- }
- void server_socket_utils::close_callback(socket_session_ptr session)
- {
- LOG4CXX_DEBUG(firebird_log, "close_callback");
- try{
- m_manager.del_session<sid>(session->id());
- }
- catch(std::exception& e)
- {
- LOG4CXX_ERROR(firebird_log, KDS_CODE_INFO << "socket异常:[" << e.what() << "]");
- }
- catch(...)
- {
- LOG4CXX_ERROR(firebird_log, KDS_CODE_INFO << "socket异常:[未知异常]");
- }
- }
- void server_socket_utils::read_data_callback(const boost::system::error_code& e,
- socket_session_ptr session, message& msg)
- {
- try{
- LOG4CXX_DEBUG(firebird_log, "command =[" << msg.command << "],["
- << msg.business_type << "],[" << msg.data() << "]");
- if (msg.command == heartbeat)
- {//心跳
- session->async_write(msg);
- }
- else if (msg.command == regist)
- {//注册
- session->set_business_type(msg.business_type);
- session->set_app_id(msg.app_id);
- m_manager.update_session(session);
- session->async_write(msg);
- LOG4CXX_FATAL(firebird_log, "远程地址:[" << session->get_remote_addr() << "],服务器类型:[" <<
- session->get_business_type() << "],服务器ID:[" << session->get_app_id() << "]注册成功!");
- }
- else if (msg.command == normal)
- {//业务数据
- handle_read_data(msg, session);
- }
- else
- {
- LOG4CXX_ERROR(firebird_log, KDS_CODE_INFO << "收到非法消息包!");
- }
- }
- catch(std::exception& e)
- {
- LOG4CXX_ERROR(firebird_log, KDS_CODE_INFO << "socket异常:[" << e.what() << "]");
- }
- catch(...)
- {
- LOG4CXX_ERROR(firebird_log, KDS_CODE_INFO << "socket异常:[未知异常]");
- }
- }
- }
5.客户端
客户端与服务器的逻辑也差不多,区别就是在于客户端通过connect得到socket_session,而服务器是通过accept得到socket_session。
//client_socket_utils.h
- #pragma once
- #include "socket_session.h"
- #include "session_manager.h"
- #include <boost/algorithm/string.hpp>
- #include <firebird/message/message.hpp>
- namespace firebird{
- class FIREBIRD_DECL client_socket_utils
- {
- public:
- client_socket_utils();
- ~client_socket_utils();
- void session_connect(std::vector<socket_session_ptr>& vSession);
- void session_connect(socket_session_ptr pSession);
- //socket_session_ptr get_session(std::string& addr);
- boost::asio::io_service& get_io_service() { return m_io_srv; }
- protected:
- virtual void handle_read_data(message& msg, socket_session_ptr pSession) = 0;
- private:
- boost::asio::io_service m_io_srv;
- boost::asio::io_service::work m_work;
- session_manager m_manager;
- void handle_connect(const boost::system::error_code& error,
- tcp::resolver::iterator endpoint_iterator, socket_session_ptr pSession);
- void close_callback(socket_session_ptr session);
- void read_data_callback(const boost::system::error_code& e,
- socket_session_ptr session, message& msg);
- };
- }
//client_socket_utils.cpp
- #include "client_socket_utils.h"
- namespace firebird{
- client_socket_utils::client_socket_utils()
- :m_work(m_io_srv), m_manager(m_io_srv, CLIENT, 3)
- {
- }
- client_socket_utils::~client_socket_utils()
- {
- }
- void client_socket_utils::session_connect(std::vector<socket_session_ptr>& vSession)
- {
- for (int i = 0; i < vSession.size(); ++i)
- {
- session_connect(vSession[i]);
- }
- }
- void client_socket_utils::session_connect(socket_session_ptr pSession)
- {
- std::string& addr = pSession->get_remote_addr();
- try{
- //注册关闭回调函数
- pSession->installCloseCallBack(boost::bind(&client_socket_utils::close_callback, this, _1));
- //注册读到数据回调函数
- pSession->installReadDataCallBack(boost::bind(&client_socket_utils::read_data_callback, this, _1, _2, _3));
- std::vector<std::string> ip_port;
- boost::split(ip_port, addr, boost::is_any_of(":"));
- if (ip_port.size() < 2)
- {
- //throw std::runtime_error("ip 格式不正确!");
- LOG4CXX_ERROR(firebird_log, "[" << addr << "] ip 格式不正确!");
- return;
- }
- tcp::resolver resolver(pSession->socket().get_io_service());
- tcp::resolver::query query(ip_port[0], ip_port[1]);
- tcp::resolver::iterator endpoint_iterator = resolver.resolve(query);
- //pSession->set_begin_endpoint(endpoint_iterator);//设置起始地址,以便重连
- //由于客户端是不断重连的,即使还未连接也要保存该session
- m_manager.add_session(pSession);
- tcp::endpoint endpoint = *endpoint_iterator;
- pSession->socket().async_connect(endpoint,
- boost::bind(&client_socket_utils::handle_connect, this,
- boost::asio::placeholders::error, ++endpoint_iterator, pSession));
- }
- catch(std::exception& e)
- {
- LOG4CXX_ERROR(firebird_log, KDS_CODE_INFO << "连接远程地址:[" << addr << "],socket异常:[" << e.what() << "]");
- }
- catch(...)
- {
- LOG4CXX_ERROR(firebird_log, KDS_CODE_INFO << "连接远程地址:[" << addr << "],socket异常:[未知异常]");
- }
- }
- void client_socket_utils::handle_connect(const boost::system::error_code& error,
- tcp::resolver::iterator endpoint_iterator, socket_session_ptr pSession)
- {
- LOG4CXX_DEBUG(firebird_log, KDS_CODE_INFO << " enter.");
- std::string sLog;
- try{
- if (!error)
- {
- LOG4CXX_FATAL(firebird_log, "服务器:[" << pSession->get_business_type() <<"],连接远程地址:[" << pSession->get_remote_addr().c_str() << "]成功!");
- pSession->start();
- //向服务器注册服务类型
- message msg;
- msg.command = regist;
- msg.business_type = pSession->get_business_type();
- msg.app_id = pSession->get_app_id();
- msg.data() = "R";
- pSession->async_write(msg);
- }
- else if (endpoint_iterator != tcp::resolver::iterator())
- {
- LOG4CXX_ERROR(firebird_log, "连接远程地址:[" << pSession->get_remote_addr().c_str() << "]失败,试图重连下一个地址。");
- pSession->socket().close();//此处用socket的close,不应用session的close触发连接,不然会导致一直重连
- tcp::endpoint endpoint = *endpoint_iterator;
- pSession->socket().async_connect(endpoint,
- boost::bind(&client_socket_utils::handle_connect, this,
- boost::asio::placeholders::error, ++endpoint_iterator, pSession));
- }
- else
- {
- LOG4CXX_ERROR(firebird_log, KDS_CODE_INFO << "连接远程地址:[" << pSession->get_remote_addr().c_str() << "]失败!");
- pSession->socket().close();//此处用socket的close,不应用session的close触发连接,不然会导致一直重连
- }
- }
- catch(std::exception& e)
- {
- LOG4CXX_ERROR(firebird_log, KDS_CODE_INFO << "连接远程地址:[" << pSession->get_remote_addr().c_str() <<"],socket异常:[" << e.what() << "]");
- }
- catch(...)
- {
- LOG4CXX_ERROR(firebird_log, KDS_CODE_INFO << "连接远程地址:[" << pSession->get_remote_addr().c_str() <<"],socket异常:[未知异常]");
- }
- }
- void client_socket_utils::read_data_callback(const boost::system::error_code& e,
- socket_session_ptr session, message& msg)
- {
- LOG4CXX_DEBUG(firebird_log, "command =[" << msg.command << "],["
- << msg.business_type << "],[" << msg.data() << "]");
- if (msg.command == heartbeat)
- {//心跳
- }
- else if (msg.command == regist)
- {//注册
- LOG4CXX_FATAL(firebird_log, "服务器:[" << session->get_business_type() <<"]注册成功。");
- }
- else if (msg.command == normal)
- {//业务数据
- handle_read_data(msg, session);
- }
- else
- {
- LOG4CXX_ERROR(firebird_log, KDS_CODE_INFO << "收到非法消息包!");
- }
- }
- //关闭session就会重连
- void client_socket_utils::close_callback(socket_session_ptr session)
- {
- LOG4CXX_DEBUG(firebird_log, KDS_CODE_INFO << "enter.");
- try{
- //tcp::resolver::iterator endpoint_iterator = context.session->get_begin_endpoint();
- std::string& addr = session->get_remote_addr();
- std::vector<std::string> ip_port;
- boost::split(ip_port, addr, boost::is_any_of(":"));
- if (ip_port.size() < 2)
- {
- LOG4CXX_ERROR(firebird_log, "[" << addr << "] ip 格式不正确!");
- return;
- }
- tcp::resolver resolver(session->socket().get_io_service());
- tcp::resolver::query query(ip_port[0], ip_port[1]);
- tcp::resolver::iterator endpoint_iterator = resolver.resolve(query);
- tcp::endpoint endpoint = *endpoint_iterator;
- session->socket().async_connect(endpoint,
- boost::bind(&client_socket_utils::handle_connect, this,
- boost::asio::placeholders::error, ++endpoint_iterator, session));
- }
- catch(std::exception& e)
- {
- LOG4CXX_ERROR(firebird_log, KDS_CODE_INFO << "连接远程地址:[" << session->get_remote_addr().c_str() <<"],socket异常:[" << e.what() << "]");
- }
- catch(...)
- {
- LOG4CXX_ERROR(firebird_log, KDS_CODE_INFO << "连接远程地址:[" << session->get_remote_addr().c_str() <<"],socket异常:[未知异常]");
- }
- }
- }
5.对象串行化
socket_session发送和接收数据包的时候使用到了对象串行化,我这里是通过thrift实现的,其实boost的serialization库也提供了这样的功能,使用起来更为方便,但我在测试过程中,thrift相比之下性能会高很多,因此就坚持使用thrift了,感兴趣的话可以看我之前写的《使用thrift串行化对象》和《轻量级序列化库boost serialization》。
5.1字符串与thrift对象的相互转换
- #pragma once
- #include <boost/shared_ptr.hpp>
- #include <transport/TBufferTransports.h>
- #include <protocol/TProtocol.h>
- #include <protocol/TBinaryProtocol.h>
- namespace firebird{
- using namespace apache::thrift;
- using namespace apache::thrift::transport;
- using namespace apache::thrift::protocol;
- template<typename T>
- void thrift_iserialize(T& stu, std::string& s)
- {
- boost::shared_ptr<TMemoryBuffer> trans(new TMemoryBuffer((uint8_t*)&s[0], s.size()));
- boost::shared_ptr<TProtocol> proto(new TBinaryProtocol(trans));
- stu.read(proto.get());
- }
- template<typename T>
- void thrift_oserialize(T& stu, std::string& s)
- {
- boost::shared_ptr<TMemoryBuffer> trans(new TMemoryBuffer());
- boost::shared_ptr<TProtocol> proto(new TBinaryProtocol(trans));
- stu.write(proto.get());
- s = trans->getBufferAsString();
- }
- }
5.2通过thrift对象,普通的对象与字符串的相互转换
- #pragma once
- #include "message_archive.hpp"
- #include <firebird/archive/thrift_archive.hpp>
- #include <firebird/message/TMessage_types.h>
- namespace firebird
- {
- /*** message to ThriftMessage ***/
- void msg_to_tmsg(TMessage& tmsg, message& msg)
- {
- //设置
- tmsg.command = msg.command;
- tmsg.business_type = msg.business_type;
- tmsg.app_id = msg.app_id;
- //设置context
- tmsg.context.cmdVersion = msg.context().cmdVersion;
- tmsg.context.cpid.swap(msg.context().cpid);
- tmsg.context.remote_ip.swap(msg.context().remote_ip);
- tmsg.context.wSerialNumber = msg.context().wSerialNumber;
- tmsg.context.session_id = msg.context().session_id;
- //设置source
- for (int i = 0; i < msg.source().size(); ++i)
- {
- tmsg.source.push_back(msg.source()[i]);
- }
- //设置destination
- for (int i = 0; i < msg.destination().size(); ++i)
- {
- tmsg.destination.push_back(msg.destination()[i]);
- }
- //设置data
- tmsg.data = msg.data();
- }
- /*** ThriftMessage to message ***/
- void tmsg_to_msg(message& msg, TMessage& tmsg)
- {
- //设置
- msg.command = tmsg.command;
- msg.business_type = tmsg.business_type;
- msg.app_id = tmsg.app_id;
- //设置context
- msg.context().cmdVersion = tmsg.context.cmdVersion;
- msg.context().cpid = tmsg.context.cpid;
- msg.context().remote_ip = tmsg.context.remote_ip;
- msg.context().wSerialNumber = tmsg.context.wSerialNumber;
- msg.context().session_id = tmsg.context.session_id;
- //设置source
- for (int i = 0; i < tmsg.source.size(); ++i)
- {
- msg.source() << tmsg.source[i];
- }
- //设置destination
- for (int i = 0; i < tmsg.destination.size(); ++i)
- {
- msg.destination() << tmsg.destination[i];
- }
- //设置data
- msg.data() = tmsg.data;
- }
- void message_iarchive(message& msg, std::string& s)
- {
- TMessage tmsg;
- thrift_iserialize(tmsg, s);
- tmsg_to_msg(msg, tmsg);
- }
- void message_oarchive(std::string& s, message& msg)
- {
- TMessage tmsg;
- msg_to_tmsg(tmsg, msg);
- thrift_oserialize(tmsg, s);
- }
- }
---恢复内容结束---
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