C++搭建集群聊天室（十五）：客户端

Posted 2021-09-09 看，未来

直接塞一个文件里面。

client.cpp

#include "json.hpp"
#include <iostream>
#include <thread>
#include <string>
#include <vector>
#include <chrono>
#include <ctime>
#include <unordered_map>
#include <functional>
using namespace std;
using json = nlohmann::json;

#include <unistd.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <semaphore.h>
#include <atomic>

#include "group.hpp"
#include "user.hpp"
#include "public.hpp"

// 记录当前系统登录的用户信息
User g_currentUser;
// 记录当前登录用户的好友列表信息
vector<User> g_currentUserFriendList;
// 记录当前登录用户的群组列表信息
vector<Group> g_currentUserGroupList;

// 控制主菜单页面程序
bool isMainMenuRunning = false;

// 用于读写线程之间的通信
sem_t rwsem;
// 记录登录状态
atomic_bool g_isLoginSuccess{false};


// 接收线程
void readTaskHandler(int clientfd);

// 获取系统时间（聊天信息需要添加时间信息）
string getCurrentTime();
// 主聊天页面程序
void mainMenu(int);
// 显示当前登录成功用户的基本信息
void showCurrentUserData();

// 聊天客户端程序实现，main线程用作发送线程，子线程用作接收线程
int main(int argc, char **argv)
{
    if (argc < 3)
    {
        cerr << "command invalid! example: ./ChatClient 127.0.0.1 6000" << endl;
        exit(-1);
    }

    // 解析通过命令行参数传递的ip和port
    char *ip = argv[1];
    uint16_t port = atoi(argv[2]);

    // 创建client端的socket
    int clientfd = socket(AF_INET, SOCK_STREAM, 0);
    if (-1 == clientfd)
    {
        cerr << "socket create error" << endl;
        exit(-1);
    }

    // 填写client需要连接的server信息ip+port
    sockaddr_in server;
    memset(&server, 0, sizeof(sockaddr_in));

    server.sin_family = AF_INET;
    server.sin_port = htons(port);
    server.sin_addr.s_addr = inet_addr(ip);

    // client和server进行连接
    if (-1 == connect(clientfd, (sockaddr *)&server, sizeof(sockaddr_in)))
    {
        cerr << "connect server error" << endl;
        close(clientfd);
        exit(-1);
    }

    // 初始化读写线程通信用的信号量
    sem_init(&rwsem, 0, 0);

    // 连接服务器成功，启动接收子线程
        // 这种操作方法以前倒是没有用过
    std::thread readTask(readTaskHandler, clientfd); // pthread_create
    readTask.detach();                               // pthread_detach

    // main线程用于接收用户输入，负责发送数据
    for (;;)
    {
        // 显示首页面菜单 登录、注册、退出
        cout << "========================" << endl;
        cout << "1. login" << endl;
        cout << "2. register" << endl;
        cout << "3. quit" << endl;
        cout << "========================" << endl;
        cout << "choice:";
        int choice = 0;
        cin >> choice;
        cin.get(); // 读掉缓冲区残留的回车

        switch (choice)
        {
        case 1: // login业务
        {
            int id = 0;
            char pwd[50] = {0};
            cout << "userid:";
            cin >> id;
            cin.get(); // 读掉缓冲区残留的回车
            cout << "userpassword:";
            cin.getline(pwd, 50);

            json js;
            js["msgid"] = LOGIN_TYPE;
            js["id"] = id;
            js["password"] = pwd;
            string request = js.dump();

            g_isLoginSuccess = false;

            int len = send(clientfd, request.c_str(), strlen(request.c_str()) + 1, 0);
            if (len == -1)
            {
                cerr << "send login msg error:" << request << endl;
            }

            sem_wait(&rwsem); // 等待信号量，由子线程处理完登录的响应消息后，通知这里
                
            if (g_isLoginSuccess) 
            {
                // 进入聊天主菜单页面
                isMainMenuRunning = true;
                mainMenu(clientfd);
            }
        }
        break;
        case 2: // register业务
        {
            char name[50] = {0};
            char pwd[50] = {0};
            cout << "username:";
            cin.getline(name, 50);
            cout << "userpassword:";
            cin.getline(pwd, 50);

            json js;
            js["msgid"] = REG_TYPE;
            js["name"] = name;
            js["password"] = pwd;
            string request = js.dump();

            int len = send(clientfd, request.c_str(), strlen(request.c_str()) + 1, 0);
            if (len == -1)
            {
                cerr << "send reg msg error:" << request << endl;
            }
            
            sem_wait(&rwsem); // 等待信号量，子线程处理完注册消息会通知
        }
        break;
        case 3: // quit业务
            close(clientfd);
            sem_destroy(&rwsem);
            exit(0);
        default:
            cerr << "invalid input!" << endl;
            break;
        }
    }

    return 0;
}

// 处理注册的响应逻辑
void doRegResponse(json &responsejs)
{
    if (0 != responsejs["errno"].get<int>()) // 注册失败
    {
        cerr << "name is already exist, register error!" << endl;
    }
    else // 注册成功
    {
        cout << "name register success, userid is " << responsejs["id"]
                << ", do not forget it!" << endl;
    }
}

// 处理登录的响应逻辑
void doLoginResponse(json &responsejs)
{
    if (0 != responsejs["errno"].get<int>()) // 登录失败
    {
        cerr << responsejs["errmsg"] << endl;
        g_isLoginSuccess = false;
    }
    else // 登录成功
    {
        // 记录当前用户的id和name
        g_currentUser.setID(responsejs["id"].get<int>());
        g_currentUser.setname(responsejs["name"]);

        // 记录当前用户的好友列表信息
        if (responsejs.contains("friends")) //如果有，贸然解析有崩溃的风险，JSON模块可脆弱
        {
            // 初始化
            g_currentUserFriendList.clear();

            vector<string> vec = responsejs["friends"];
            for (string &str : vec)
            {
                json js = json::parse(str);
                User user;
                user.setID(js["id"].get<int>());
                user.setname(js["name"]);
                user.setstate(js["state"]);
                g_currentUserFriendList.push_back(user);
            }
        }

        // 记录当前用户的群组列表信息
        if (responsejs.contains("groups"))
        {
            // 初始化
            g_currentUserGroupList.clear();

            vector<string> vec1 = responsejs["groups"];
            for (string &groupstr : vec1)
            {
                json grpjs = json::parse(groupstr);
                Group group;
                group.setId(grpjs["id"].get<int>());
                group.setName(grpjs["groupname"]);
                group.setDesc(grpjs["groupdesc"]);

                vector<string> vec2 = grpjs["users"];
                for (string &userstr : vec2)
                {
                    GroupUser user;
                    json js = json::parse(userstr);
                    user.setID(js["id"].get<int>());
                    user.setname(js["name"]);
                    user.setstate(js["state"]);
                    user.setRole(js["role"]);
                    group.getUsers().push_back(user);
                }

                g_currentUserGroupList.push_back(group);
            }
        }

        // 显示登录用户的基本信息
        showCurrentUserData();

        // 显示当前用户的离线消息  个人聊天信息或者群组消息
        if (responsejs.contains("offlinemsg"))
        {
            vector<string> vec = responsejs["offlinemsg"];
            for (string &str : vec)
            {
                json js = json::parse(str);
                // time + [id] + name + " said: " + xxx
                if (ONE_CHAT_MSG == js["msgid"].get<int>())
                {
                    cout << js["time"].get<string>() << " [" << js["id"] << "]" << js["name"].get<string>()
                            << " said: " << js["msg"].get<string>() << endl;
                }
                else
                {
                    cout << "群消息[" << js["groupid"] << "]:" << js["time"].get<string>() << " [" << js["id"] << "]" << js["name"].get<string>()
                            << " said: " << js["msg"].get<string>() << endl;
                }
            }
        }

        g_isLoginSuccess = true;
    }
}

// 子线程 - 接收线程
void readTaskHandler(int clientfd)
{
    for (;;)
    {
        char buffer[1024] = {0};
        int len = recv(clientfd, buffer, 1024, 0);  // 阻塞了
        if (-1 == len || 0 == len)
        {
            close(clientfd);
            exit(-1);
        }

        // 接收ChatServer转发的数据，反序列化生成json数据对象
        json js = json::parse(buffer);
        int msgtype = js["msgid"].get<int>();
        if (ONE_CHAT_MSG == msgtype)
        {
            cout << js["time"].get<string>() << " [" << js["id"] << "]" << js["name"].get<string>()
                 << " said: " << js["msg"].get<string>() << endl;
            continue;
        }

        if (GROUP_CHAT_MSG == msgtype)
        {
            cout << "群消息[" << js["groupid"] << "]:" << js["time"].get<string>() << " [" << js["id"] << "]" << js["name"].get<string>()
                 << " said: " << js["msg"].get<string>() << endl;
            continue;
        }

        if (LOGIN_MSG_ACK == msgtype)
        {
            doLoginResponse(js); // 处理登录响应的业务逻辑
            sem_post(&rwsem);    // 通知主线程，登录结果处理完成
            continue;
        }

        if (REG_MSG_ACK == msgtype)
        {
            doRegResponse(js);
            sem_post(&rwsem);    // 通知主线程，注册结果处理完成
            continue;
        }
    }
}

// 显示当前登录成功用户的基本信息
void showCurrentUserData()
{
    cout << "======================login user======================" << endl;
    cout << "current login user => id:" << g_currentUser.getID() << " name:" << g_currentUser.getname() << endl;
    cout << "----------------------friend list---------------------" << endl;
    if (!g_currentUserFriendList.empty())
    {
        for (User &user : g_currentUserFriendList)
        {
            cout << user.getID() << " " << user.getname() << " " << user.getstate() << endl;
        }
    }
    cout << "----------------------group list----------------------" << endl;
    if (!g_currentUserGroupList.empty())
    {
        for (Group &group : g_currentUserGroupList)
        {
            cout << group.getId() << " " << group.getName() C++搭建集群聊天室（十六）：代码测试文档

 C++搭建集群聊天室（十六）：代码测试文档
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