本文共 4025 字，大约阅读时间需要 13 分钟。
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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