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环境搭建

Vmware虚拟机

Ubuntu20.04

执行官方提供的shell脚本下载环境依赖

vscode remote

先看主函数

#include "socket.hh"#include "util.hh"#include 
   
    #include 
    
     using namespace std;void get_URL(const string &host, const string &path) {    // Your code here.    // You will need to connect to the "http" service on    // the computer whose name is in the "host" string,    // then request the URL path given in the "path" string.    // Then you'll need to print out everything the server sends back,    // (not just one call to read() -- everything) until you reach    // the "eof" (end of file).    cerr << "Function called: get_URL(" << host << ", " << path << ").\n";    cerr << "Warning: get_URL() has not been implemented yet.\n";}int main(int argc, char *argv[]) {    try {        if (argc <= 0) {            abort();  // For sticklers: don't try to access argv[0] if argc <= 0.        }        // The program takes two command-line arguments: the hostname and "path" part of the URL.        // Print the usage message unless there are these two arguments (plus the program name        // itself, so arg count = 3 in total).        if (argc != 3) {            cerr << "Usage: " << argv[0] << " HOST PATH\n";            cerr << "\tExample: " << argv[0] << " stanford.edu /class/cs144\n";            return EXIT_FAILURE;        }        // Get the command-line arguments.        const string host = argv[1];        const string path = argv[2];        // Call the student-written function.        get_URL(host, path);    } catch (const exception &e) {        cerr << e.what() << "\n";        return EXIT_FAILURE;    }    return EXIT_SUCCESS;}
    
   

 这个内容是用C++实现一个获取http服务器数据的简单客户端程序。回顾一下用原始API写一个客户端的过程，以及简单的HTTP协议头的写法。

这里已经封装好了相关的类，在TcpSocket中，阅读源码调用即可。

void get_URL(const string &host, const string &path) {    // Your code here.    // You will need to connect to the "http" service on    // the computer whose name is in the "host" string,    // then request the URL path given in the "path" string.    // Then you'll need to print out everything the server sends back,    // (not just one call to read() -- everything) until you reach    // the "eof" (end of file).    // Address address(host);    TCPSocket tcpSocker;    tcpSocker.connect(Address(host,"http"));    tcpSocker.write("GET " + path + " HTTP/1.1\r\n");    tcpSocker.write("Host: " + host + "\r\n");    tcpSocker.write("Connection: close \r\n");    tcpSocker.write("\r\n");    while(!tcpSocker.eof()){        auto buffer = tcpSocker.read();        cout<

第二个任务是实现一个字节流, 有读端和写端，写的数据可能没有完全读出去，所以是一个双端队列,结合提议，很容易想到以下实现

成员函数如下, 在现代C++中，可以直接声明初始化(编译很严格，必须初始化)

class ByteStream {  private:    // Your code here -- add private members as necessary.    // Hint: This doesn't need to be a sophisticated data structure at    // all, but if any of your tests are taking longer than a second,    // that's a sign that you probably want to keep exploring    // different approaches.    size_t capacity;    size_t read_count = 0;    size_t write_count = 0;    bool is_end = false;    bool _error{};  //!< Flag indicating that the stream suffered an error.    std::deque
   
     buffer = {};}
   

 以下是函数实现

ByteStream::ByteStream(const size_t capacity_):capacity(capacity_){}size_t ByteStream::write(const string &data) {    auto data_size = data.size();    if(data_size>capacity-buffer.size()){        data_size = capacity-buffer.size();    }    write_count += data_size;    for(size_t i=0;i
   
    buffer.size()){        peek_size = buffer.size();     }    return string().assign(buffer.begin(),buffer.begin()+peek_size);}//! \param[in] len bytes will be removed from the output side of the buffervoid ByteStream::pop_output(const size_t len) {    auto pop_size = len;    if(pop_size>buffer.size()){        pop_size = buffer.size();    }    read_count++;    for(size_t i=0;i
    
     buffer.size()){        read_size = buffer.size();    }    read_count += read_size;    string str = string().assign(buffer.begin(),buffer.begin()+read_size);    for(size_t i=0;i
    
   

接下来要做的事，利用GDB调试程序，直到完成所以测试。

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