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Refactor all examples:

Browse Source 
fix #575, fix #604, fix #608, fix #634, fix #712

All examples are rewritten:

* Using Best Practices
* Mostly self-contained
* New examples to complete the feature matrix
* The server-framework example is removed
This commit is contained in:
Vinnie Falco
2017-08-07 20:53:11 -07:00
parent 20a8f7d75b
commit dd71b0f94d
187 changed files with 11759 additions and 7098 deletions
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example/http/server/fast/http_server_fast.cpp
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//
// Copyright (c) 2017 Christopher M. Kohlhoff (chris at kohlhoff dot com)
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
// Official repository: https://github.com/boostorg/beast
//
//------------------------------------------------------------------------------
//
// Example: HTTP server, fast
//
//------------------------------------------------------------------------------
#include "fields_alloc.hpp"
#include <boost/beast/core.hpp>
#include <boost/beast/http.hpp>
#include <boost/beast/version.hpp>
#include <boost/asio.hpp>
#include <boost/filesystem.hpp>
#include <chrono>
#include <cstdlib>
#include <cstring>
#include <iostream>
#include <list>
#include <memory>
#include <string>
namespace ip = boost::asio::ip; // from <boost/asio.hpp>
using tcp = boost::asio::ip::tcp; // from <boost/asio.hpp>
namespace http = boost::beast::http; // from <boost/beast/http.hpp>
// Return a reasonable mime type based on the extension of a file.
boost::beast::string_view
mime_type(boost::beast::string_view path)
{
using boost::beast::iequals;
auto const ext = [&path]
{
auto const pos = path.rfind(".");
if(pos == boost::beast::string_view::npos)
return boost::beast::string_view{};
return path.substr(pos);
}();
if(iequals(ext, ".htm")) return "text/html";
if(iequals(ext, ".html")) return "text/html";
if(iequals(ext, ".php")) return "text/html";
if(iequals(ext, ".css")) return "text/css";
if(iequals(ext, ".txt")) return "text/plain";
if(iequals(ext, ".js")) return "application/javascript";
if(iequals(ext, ".json")) return "application/json";
if(iequals(ext, ".xml")) return "application/xml";
if(iequals(ext, ".swf")) return "application/x-shockwave-flash";
if(iequals(ext, ".flv")) return "video/x-flv";
if(iequals(ext, ".png")) return "image/png";
if(iequals(ext, ".jpe")) return "image/jpeg";
if(iequals(ext, ".jpeg")) return "image/jpeg";
if(iequals(ext, ".jpg")) return "image/jpeg";
if(iequals(ext, ".gif")) return "image/gif";
if(iequals(ext, ".bmp")) return "image/bmp";
if(iequals(ext, ".ico")) return "image/vnd.microsoft.icon";
if(iequals(ext, ".tiff")) return "image/tiff";
if(iequals(ext, ".tif")) return "image/tiff";
if(iequals(ext, ".svg")) return "image/svg+xml";
if(iequals(ext, ".svgz")) return "image/svg+xml";
return "application/text";
}
class http_worker
{
public:
http_worker(http_worker const&) = delete;
http_worker& operator=(http_worker const&) = delete;
http_worker(tcp::acceptor& acceptor, const std::string& doc_root) :
acceptor_(acceptor),
doc_root_(doc_root)
{
}
void start()
{
accept();
check_deadline();
}
private:
using alloc_t = fields_alloc<char>;
using request_body_t = http::basic_dynamic_body<boost::beast::flat_static_buffer<1024 * 1024>>;
// The acceptor used to listen for incoming connections.
tcp::acceptor& acceptor_;
// The path to the root of the document directory.
std::string doc_root_;
// The socket for the currently connected client.
tcp::socket socket_{acceptor_.get_io_service()};
// The buffer for performing reads
boost::beast::flat_static_buffer<8192> buffer_;
// The allocator used for the fields in the request and reply.
alloc_t alloc_{8192};
// The parser for reading the requests
boost::optional<http::request_parser<request_body_t, alloc_t>> parser_;
// The timer putting a time limit on requests.
boost::asio::basic_waitable_timer<std::chrono::steady_clock> request_deadline_{
acceptor_.get_io_service(), (std::chrono::steady_clock::time_point::max)()};
// The string-based response message.
boost::optional<http::response<http::string_body, http::basic_fields<alloc_t>>> string_response_;
// The string-based response serializer.
boost::optional<http::response_serializer<http::string_body, http::basic_fields<alloc_t>>> string_serializer_;
// The file-based response message.
boost::optional<http::response<http::file_body, http::basic_fields<alloc_t>>> file_response_;
// The file-based response serializer.
boost::optional<http::response_serializer<http::file_body, http::basic_fields<alloc_t>>> file_serializer_;
void accept()
{
// Clean up any previous connection.
boost::beast::error_code ec;
socket_.close(ec);
buffer_.consume(buffer_.size());
acceptor_.async_accept(
socket_,
[this](boost::beast::error_code ec)
{
if (ec)
{
accept();
}
else
{
// Request must be fully processed within 60 seconds.
request_deadline_.expires_from_now(
std::chrono::seconds(60));
read_request();
}
});
}
void read_request()
{
// On each read the parser needs to be destroyed and
// recreated. We store it in a boost::optional to
// achieve that.
//
// Arguments passed to the parser constructor are
// forwarded to the message object. A single argument
// is forwarded to the body constructor.
//
// We construct the dynamic body with a 1MB limit
// to prevent vulnerability to buffer attacks.
//
parser_.emplace(
std::piecewise_construct,
std::make_tuple(),
std::make_tuple(alloc_));
http::async_read(
socket_,
buffer_,
*parser_,
[this](boost::beast::error_code ec)
{
if (ec)
accept();
else
process_request(parser_->get());
});
}
void process_request(http::request<request_body_t, http::basic_fields<alloc_t>> const& req)
{
switch (req.method())
{
case http::verb::get:
send_file(req.target());
break;
default:
// We return responses indicating an error if
// we do not recognize the request method.
send_bad_response(
http::status::bad_request,
"Invalid request-method '" + req.method_string().to_string() + "'\r\n");
break;
}
}
void send_bad_response(
http::status status,
std::string const& error)
{
string_response_.emplace(
std::piecewise_construct,
std::make_tuple(),
std::make_tuple(alloc_));
string_response_->result(status);
string_response_->set(http::field::server, "Beast");
string_response_->set(http::field::connection, "close");
string_response_->set(http::field::content_type, "text/plain");
string_response_->body = error;
string_response_->prepare_payload();
string_serializer_.emplace(*string_response_);
http::async_write(
socket_,
*string_serializer_,
[this](boost::beast::error_code ec)
{
socket_.shutdown(tcp::socket::shutdown_send, ec);
string_serializer_.reset();
string_response_.reset();
accept();
});
}
void send_file(boost::beast::string_view target)
{
// Request path must be absolute and not contain "..".
if (target.empty() || target[0] != '/' || target.find("..") != std::string::npos)
{
send_bad_response(
http::status::not_found,
"File not found\r\n");
return;
}
std::string full_path = doc_root_;
full_path.append(
target.data(),
target.size());
http::file_body::value_type file;
boost::beast::error_code ec;
file.open(
full_path.c_str(),
boost::beast::file_mode::read,
ec);
if(ec)
{
send_bad_response(
http::status::not_found,
"File not found\r\n");
return;
}
file_response_.emplace(
std::piecewise_construct,
std::make_tuple(),
std::make_tuple(alloc_));
file_response_->result(http::status::ok);
file_response_->set(http::field::server, "Beast");
file_response_->set(http::field::connection, "close");
file_response_->set(http::field::content_type, mime_type(target.to_string()));
file_response_->body = std::move(file);
file_response_->prepare_payload();
file_serializer_.emplace(*file_response_);
http::async_write(
socket_,
*file_serializer_,
[this](boost::beast::error_code ec)
{
socket_.shutdown(tcp::socket::shutdown_send, ec);
file_serializer_.reset();
file_response_.reset();
accept();
});
}
void check_deadline()
{
// The deadline may have moved, so check it has really passed.
if (request_deadline_.expires_at() <= std::chrono::steady_clock::now())
{
// Close socket to cancel any outstanding operation.
boost::beast::error_code ec;
socket_.close();
// Sleep indefinitely until we're given a new deadline.
request_deadline_.expires_at(
std::chrono::steady_clock::time_point::max());
}
request_deadline_.async_wait(
[this](boost::beast::error_code)
{
check_deadline();
});
}
};
int main(int argc, char* argv[])
{
try
{
// Check command line arguments.
if (argc != 6)
{
std::cerr << "Usage: http_server_fast <address> <port> <doc_root> <num_workers> {spin|block}\n";
std::cerr << " For IPv4, try:\n";
std::cerr << " http_server_fast 0.0.0.0 80 . 100 block\n";
std::cerr << " For IPv6, try:\n";
std::cerr << " http_server_fast 0::0 80 . 100 block\n";
return EXIT_FAILURE;
}
auto address = ip::address::from_string(argv[1]);
unsigned short port = static_cast<unsigned short>(std::atoi(argv[2]));
std::string doc_root = argv[3];
int num_workers = std::atoi(argv[4]);
bool spin = (std::strcmp(argv[5], "spin") == 0);
boost::asio::io_service ios{1};
tcp::acceptor acceptor{ios, {address, port}};
std::list<http_worker> workers;
for (int i = 0; i < num_workers; ++i)
{
workers.emplace_back(acceptor, doc_root);
workers.back().start();
}
if (spin)
for (;;) ios.poll();
else
ios.run();
}
catch (const std::exception& e)
{
std::cerr << "Error: " << e.what() << std::endl;
return EXIT_FAILURE;
}
}