无法读取URL主体(JSON)
Boost asio: Unable to read URL Body (JSON)
我已经测试了以下Boost::Asio最小HTTP服务器示例:(基于Boost:Asio的最小HTTP服务器)
我能够成功地收集Header信息，如Content-Length，但当我试图读取Body信息时，示例挂起。下面是尝试读取Body信息的函数:
static void read_body(std::shared_ptr<session> pThis) {
info("read_body");
int nbuffer = pThis->headers.content_length();
std::shared_ptr<std::vector<char>> bufptr = std::make_shared<std::vector<char>>(nbuffer);
asio::async_read(pThis->socket, boost::asio::buffer(*bufptr, nbuffer),
[pThis](const error_code& e, std::size_t s)
{
info("read body complete");
});
}
我利用libmicrohttpd的解决方案成功地读取了相同的Body信息。
是否有一个更正确的方法来读取主体(JSON)信息与Boost:ASIO?
问题的本质是双重的:
-
首先，存在未定义行为，因为您无法在完成处理程序中捕获
bufptr，这意味着在系统调用写入矢量时，矢量已经被释放了… -
其次，你是在"垃圾"正文的第一部分，因为你已经在阅读标题时收到它。您应该添加代码来保存
read_next_line中已经收到的部分
真正的"误导"可能在
的使用中asio::async_read_until(pThis->socket, pThis->buff, 'r', ...
就好像它只接收到一行。套接字不是这样工作的。你会收到一个包裹。TCP栈决定包的构成。Asio just 承诺读取"直到"数据包>contains<分隔符>。它没有说它不会接收更多，它只是没有安排另一个接收操作。
所以，要真正解决这个问题，你可以简单地一次读取所有的头:
asio::async_read_until(pThis->socket, pThis->buff, "rnrn",
[pThis](const error_code &e, std::size_t s) {
if (e) { std::cerr << "Error:" << __LINE__ << " " << e.message() << "n"; return; }
std::cout << __FILE__ << ":" << __LINE__ << " received:" << s << "n";
std::istream is(&pThis->buff);
std::string line, ignore;
if (getline(is, line, 'r') && is.ignore(1, 'n'))
pThis->headers.on_read_request_line(line);
while (getline(is, line, 'r') && is.ignore(1, 'n') && !line.empty())
pThis->headers.on_read_header(line);
注意同样，重要的是不要假设报头结束与数据包边界一致。因此，启动read_body()，耗尽已经接收到的可用输入:
std::shared_ptr<std::vector<char> > bufptr = std::make_shared<std::vector<char> >(nbuffer);
auto partial = std::copy(
std::istreambuf_iterator<char>(&pThis->buff), {},
bufptr->begin());
std::size_t already_received = std::distance(bufptr->begin(), partial);
assert(nbuffer >= already_received);
nbuffer -= already_received;
修复DEMO
Live On Coliru
#include <boost/asio.hpp>
#include <boost/algorithm/string/trim.hpp>
#include <string>
#include <memory>
#include <iostream>
#include <fstream>
using namespace boost;
using namespace boost::system;
using namespace boost::asio;
unsigned char *get_icon(int *pOutSize);
class session;
class http_headers {
std::string method;
std::string url;
std::string version;
std::map<std::string, std::string> headers;
public:
std::string get_response() {
std::stringstream ssOut;
if (url == "/favicon.ico") {
int nSize = 0;
unsigned char *data = get_icon(&nSize);
ssOut << "HTTP/1.1 200 OK" << std::endl;
ssOut << "content-type: image/vnd.microsoft.icon" << std::endl;
ssOut << "Content-Length: " << nSize << std::endl;
ssOut << std::endl;
ssOut.write((char *)data, nSize);
} else if (url == "/") {
std::string sHTML = "<html><body><h1>Hello World</h1><p>This is a test web server in c++</p></body></html>";
ssOut << "HTTP/1.1 200 OK" << std::endl;
ssOut << "Content-Type: text/html" << std::endl;
ssOut << "Content-Length: " << sHTML.length() << std::endl;
ssOut << std::endl;
ssOut << sHTML;
} else {
std::string sHTML = "<html><body><h1>404 Not Found</h1><p>There's nothing here.</p></body></html>";
ssOut << "HTTP/1.1 404 Not Found" << std::endl;
ssOut << "Content-Type: text/html" << std::endl;
ssOut << "Content-Length: " << sHTML.length() << std::endl;
ssOut << std::endl;
ssOut << sHTML;
}
return ssOut.str();
}
size_t content_length() {
auto request = headers.find("Content-Length");
if (request != headers.end()) {
std::stringstream ssLength(request->second);
size_t content_length;
ssLength >> content_length;
return content_length;
}
return 0;
}
void on_read_header(std::string line) {
std::cout << "header: '" << line << "'n";
std::stringstream ssHeader(line);
std::string headerName;
std::getline(ssHeader, headerName, ':');
std::string value;
std::getline(ssHeader, value);
headers[headerName] = value;
}
void on_read_request_line(std::string line) {
std::stringstream ssRequestLine(line);
ssRequestLine >> method;
ssRequestLine >> url;
ssRequestLine >> version;
std::cout << "request for resource: " << url << std::endl;
}
};
namespace {
static void info(std::string s) { std::cout << "INFO:" << s << "n"; }
}
class session {
asio::streambuf buff;
http_headers headers;
static void read_body(std::shared_ptr<session> pThis) {
info("read_body");
size_t nbuffer = pThis->headers.content_length();
std::cout << __FILE__ << ":" << __LINE__ << " nbuffer:" << nbuffer << "n";
std::shared_ptr<std::vector<char> > bufptr = std::make_shared<std::vector<char> >(nbuffer);
auto partial = std::copy(
std::istreambuf_iterator<char>(&pThis->buff), {},
bufptr->begin());
std::size_t already_received = std::distance(bufptr->begin(), partial);
assert(nbuffer >= already_received);
nbuffer -= already_received;
asio::async_read(pThis->socket, boost::asio::buffer(&*bufptr->begin() + already_received, nbuffer),
[=](const error_code &e, std::size_t s) {
info("read body complete");
// EOF is to be expected on client disconnect
if (e && e != boost::asio::error::eof) {
std::cerr << "Error:" << __LINE__ << " " << e.message() << "n"; return;
}
std::cout << __FILE__ << ":" << __LINE__ << " received:" << s << "/" << nbuffer << "n";
std::string body(&*bufptr->begin(), already_received + s);
std::string::size_type p = 0;
for (int i = 0; i<2; ++i)
p = body.find_last_of("rn", p-1);
std::cout << "Tail: '" << body.substr(p+1) << "'n";
{
std::ofstream ofs("debug.txt", std::ios::binary);
ofs << body;
ofs << "n" << __FILE__ << ":" << __LINE__ << " received:" << s << "/" << nbuffer << "n";
}
});
}
static void read_headers(std::shared_ptr<session> pThis) {
asio::async_read_until(pThis->socket, pThis->buff, "rnrn",
[pThis](const error_code &e, std::size_t s) {
if (e) { std::cerr << "Error:" << __LINE__ << " " << e.message() << "n"; return; }
std::cout << __FILE__ << ":" << __LINE__ << " received:" << s << "n";
std::istream is(&pThis->buff);
std::string line, ignore;
if (getline(is, line, 'r') && is.ignore(1, 'n'))
pThis->headers.on_read_request_line(line);
while (getline(is, line, 'r') && is.ignore(1, 'n') && !line.empty())
pThis->headers.on_read_header(line);
if (pThis->headers.content_length()) {
pThis->read_body(pThis);
auto str = std::make_shared<std::string>("HTTP/1.1 200 OKrnContent-Length: 0rnrn");
asio::async_write(
pThis->socket, boost::asio::buffer(*str),
[pThis, str](const error_code &e, std::size_t s) {
std::cout << "done" << std::endl;
});
} else {
std::shared_ptr<std::string> str = std::make_shared<std::string>(pThis->headers.get_response());
asio::async_write(
pThis->socket, boost::asio::buffer(*str),
[pThis, str](const error_code &e, std::size_t s) {
std::cout << "done" << std::endl;
});
}
});
}
public:
ip::tcp::socket socket;
session(io_service &io_service) : socket(io_service) {}
static void interact(std::shared_ptr<session> pThis) { read_headers(pThis); }
};
void accept_and_run(ip::tcp::acceptor &acceptor, io_service &io_service) {
std::shared_ptr<session> sesh = std::make_shared<session>(io_service);
acceptor.async_accept(sesh->socket, [sesh, &acceptor, &io_service](const error_code &accept_error) {
accept_and_run(acceptor, io_service);
if (accept_error) {
std::cerr << "Accept error: " << accept_error.message() << "n";
} else {
session::interact(sesh);
}
});
}
int main() {
io_service io_service;
ip::tcp::endpoint endpoint{ ip::tcp::v4(), 8181 };
ip::tcp::acceptor acceptor{ io_service, endpoint };
acceptor.listen();
accept_and_run(acceptor, io_service);
io_service.run();
}
unsigned char icon_data[] = {
// reserved
0x00, 0x00,
// icon type (1 = icon)
0x01, 0x00,
// number of images (1)
0x01, 0x00,
// width, height (16x16)
0x10, 0x10,
// size of colour palette
0x00,
// reserved
0x00,
// colour planes (1)
0x01, 0x00,
// bits per pixel (32)
0x20, 0x00,
// size of data in bytes
0x28, 0x04, 0x00, 0x00,
// offset of bitmap data
0x16, 0x00, 0x00, 0x00,
// BEGIN BITMAPINFOHEADER
// bcsize
0x28, 0x00, 0x00, 0x00, // biSize
0x10, 0x00, 0x00, 0x00, // biWidth
0x20, 0x00, 0x00, 0x00, // biHeight (with both AND and XOR mask? wtf?)
0x01, 0x00, // biPlanes
0x20, 0x00, // biBitCount (32)
0x00, 0x00, 0x00, 0x00, // biCompression
0x00, 0x00, 0x00, 0x00, // biSizeImage
0x00, 0x00, 0x00, 0x00, // biXPelsPerMeter
0x00, 0x00, 0x00, 0x00, // biYPelsPerMeter
0x00, 0x00, 0x00, 0x00, // biClrUsed
0x00, 0x00, 0x00, 0x00, // biClrImportant
// END BITMAPINFOHEADER
// BITMAP DATA (4 bytes per pixel)
0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
0x00, 0xFF, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0xFF, 0x00, 0x00, 0xFF, 0xFF, 0x00, 0x00, 0xFF, 0xFF,
0x00, 0x00, 0xFF, 0xFF, 0x00, 0x00, 0xFF, 0xFF, 0x00, 0x00, 0xFF, 0xFF, 0x00, 0x00, 0xFF, 0xFF,
0x00, 0x00, 0xFF, 0xFF, 0x00, 0x00, 0xFF, 0xFF, 0x00, 0x00, 0xFF, 0xFF, 0x00, 0x00, 0xFF, 0xFF,
0x00, 0x00, 0xFF, 0xFF, 0x00, 0x00, 0xFF, 0xFF, 0x00, 0x00, 0xFF, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
0x00, 0xFF, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
0x00, 0xFF, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
0x00, 0xFF, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
0x00, 0xFF, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
0x00, 0xFF, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
0x00, 0xFF, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
0x00, 0xFF, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
0x00, 0xFF, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
0x00, 0xFF, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
0x00, 0xFF, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
0x00, 0xFF, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
0x00, 0xFF, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
0x00, 0xFF, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0xFF, 0x00, 0x00, 0xFF, 0xFF, 0x00, 0x00, 0xFF, 0xFF,
0x00, 0x00, 0xFF, 0xFF, 0x00, 0x00, 0xFF, 0xFF, 0x00, 0x00, 0xFF, 0xFF, 0x00, 0x00, 0xFF, 0xFF,
0x00, 0x00, 0xFF, 0xFF, 0x00, 0x00, 0xFF, 0xFF, 0x00, 0x00, 0xFF, 0xFF, 0x00, 0x00, 0xFF, 0xFF,
0x00, 0x00, 0xFF, 0xFF, 0x00, 0x00, 0xFF, 0xFF, 0x00, 0x00, 0xFF, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF
};
unsigned char *get_icon(int *pOut) {
*pOut = sizeof(icon_data);
return icon_data;
}
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