forked from boostorg/beast
Add async-ssl-system-executor http client example
This example HTTP client application uses the `system_executor` to show how to use it with the I/O objects in ASIO and Beast. Signed-off-by: Damian Jarek <damian.jarek93@gmail.com>
This commit is contained in:
Damian Jarek
committed by
Vinnie Falco
Vinnie Falco
parent
1261e7773f
commit
9170a0daaa
31
example/http/client/async-ssl-system-executor/CMakeLists.txt
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31
example/http/client/async-ssl-system-executor/CMakeLists.txt
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#
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# Copyright (c) 2016-2017 Vinnie Falco (vinnie dot falco at gmail dot com)
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#
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# Distributed under the Boost Software License, Version 1.0. (See accompanying
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# file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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#
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# Official repository: https://github.com/boostorg/beast
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#
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if (OPENSSL_FOUND)
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GroupSources(include/boost/beast beast)
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GroupSources(example/common common)
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GroupSources(example/http/client/async-ssl-system-executor "/")
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add_executable (http-client-async-ssl-system-executor
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${BOOST_BEAST_FILES}
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${PROJECT_SOURCE_DIR}/example/common/root_certificates.hpp
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Jamfile
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http_client_async_ssl_system_executor.cpp
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)
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set_property(TARGET http-client-async-ssl-system-executor PROPERTY FOLDER "example-http-client")
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target_link_libraries (http-client-async-ssl-system-executor
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OpenSSL::SSL OpenSSL::Crypto
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lib-asio
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lib-asio-ssl
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lib-beast
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)
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endif()
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example/http/client/async-ssl-system-executor/Jamfile
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example/http/client/async-ssl-system-executor/Jamfile
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#
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# Copyright (c) 2016-2017 Vinnie Falco (vinnie dot falco at gmail dot com)
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#
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# Distributed under the Boost Software License, Version 1.0. (See accompanying
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# file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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#
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# Official repository: https://github.com/boostorg/beast
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#
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import ac ;
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project
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: requirements
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[ ac.check-library /boost/beast//lib-asio-ssl : <library>/boost/beast//lib-asio-ssl/<link>static : <build>no ]
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;
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exe http-client-async-ssl-system-executor :
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http_client_async_ssl_system_executor.cpp
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:
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<variant>coverage:<build>no
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<variant>ubasan:<build>no
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;
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//
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// Copyright (c) 2016-2019 Vinnie Falco (vinnie dot falco at gmail dot com)
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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// Official repository: https://github.com/boostorg/beast
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//
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//------------------------------------------------------------------------------
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//
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// Example: HTTP SSL client, asynchronous, using system_executor
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//
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//------------------------------------------------------------------------------
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#include "example/common/root_certificates.hpp"
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#include <boost/beast/core.hpp>
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#include <boost/beast/http.hpp>
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#include <boost/beast/ssl.hpp>
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#include <boost/beast/version.hpp>
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#include <boost/asio/strand.hpp>
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#include <cstdlib>
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#include <functional>
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#include <iostream>
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#include <memory>
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#include <string>
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namespace beast = boost::beast; // from <boost/beast.hpp>
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namespace http = beast::http; // from <boost/beast/http.hpp>
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namespace net = boost::asio; // from <boost/asio.hpp>
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namespace ssl = boost::asio::ssl; // from <boost/asio/ssl.hpp>
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using tcp = boost::asio::ip::tcp; // from <boost/asio/ip/tcp.hpp>
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//------------------------------------------------------------------------------
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// Report a failure
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void
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fail(beast::error_code ec, char const* what)
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{
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std::cerr << what << ": " << ec.message() << "\n";
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}
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// Performs an HTTP GET and prints the response
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class session : public std::enable_shared_from_this<session>
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{
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tcp::resolver resolver_;
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beast::ssl_stream<beast::tcp_stream> stream_;
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beast::flat_buffer buffer_; // (Must persist between reads)
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http::request<http::empty_body> req_;
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http::response<http::string_body> res_;
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// Objects are constructed with a strand to
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// ensure that handlers do not execute concurrently.
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session(net::strand<net::system_executor> strand, ssl::context& ctx)
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: resolver_(strand)
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, stream_(strand, ctx)
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{
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}
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public:
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// Delegate construction to a prive constructor to be able to use
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// the same strand for both I/O object.
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explicit
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session(ssl::context& ctx)
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: session(net::make_strand(net::system_executor()), ctx)
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{
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}
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// Start the asynchronous operation
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void
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run(
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char const* host,
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char const* port,
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char const* target,
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int version)
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{
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// Set SNI Hostname (many hosts need this to handshake successfully)
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if(! SSL_set_tlsext_host_name(stream_.native_handle(), host))
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{
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beast::error_code ec{static_cast<int>(::ERR_get_error()), net::error::get_ssl_category()};
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std::cerr << ec.message() << "\n";
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return;
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}
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// Set up an HTTP GET request message
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req_.version(version);
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req_.method(http::verb::get);
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req_.target(target);
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req_.set(http::field::host, host);
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req_.set(http::field::user_agent, BOOST_BEAST_VERSION_STRING);
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// Look up the domain name
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resolver_.async_resolve(
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host,
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port,
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beast::bind_front_handler(
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&session::on_resolve,
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shared_from_this()));
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}
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void
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on_resolve(
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beast::error_code ec,
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tcp::resolver::results_type results)
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{
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if(ec)
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return fail(ec, "resolve");
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// Set a timeout on the operation
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beast::get_lowest_layer(stream_).expires_after(std::chrono::seconds(30));
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// Make the connection on the IP address we get from a lookup
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beast::get_lowest_layer(stream_).async_connect(
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results,
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beast::bind_front_handler(
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&session::on_connect,
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shared_from_this()));
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}
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void
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on_connect(beast::error_code ec, tcp::resolver::results_type::endpoint_type)
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{
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if(ec)
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return fail(ec, "connect");
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// Perform the SSL handshake
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stream_.async_handshake(
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ssl::stream_base::client,
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beast::bind_front_handler(
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&session::on_handshake,
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shared_from_this()));
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}
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void
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on_handshake(beast::error_code ec)
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{
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if(ec)
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return fail(ec, "handshake");
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// Set a timeout on the operation
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beast::get_lowest_layer(stream_).expires_after(std::chrono::seconds(30));
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// Send the HTTP request to the remote host
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http::async_write(stream_, req_,
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beast::bind_front_handler(
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&session::on_write,
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shared_from_this()));
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}
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void
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on_write(
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beast::error_code ec,
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std::size_t bytes_transferred)
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{
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boost::ignore_unused(bytes_transferred);
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if(ec)
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return fail(ec, "write");
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// Receive the HTTP response
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http::async_read(stream_, buffer_, res_,
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beast::bind_front_handler(
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&session::on_read,
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shared_from_this()));
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}
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void
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on_read(
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beast::error_code ec,
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std::size_t bytes_transferred)
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{
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boost::ignore_unused(bytes_transferred);
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if(ec)
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return fail(ec, "read");
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// Write the message to standard out
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std::cout << res_ << std::endl;
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// Set a timeout on the operation
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beast::get_lowest_layer(stream_).expires_after(std::chrono::seconds(30));
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// Gracefully close the stream
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stream_.async_shutdown(
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beast::bind_front_handler(
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&session::on_shutdown,
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shared_from_this()));
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}
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void
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on_shutdown(beast::error_code ec)
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{
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if(ec == net::error::eof)
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{
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// Rationale:
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// http://stackoverflow.com/questions/25587403/boost-asio-ssl-async-shutdown-always-finishes-with-an-error
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ec = {};
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}
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if(ec)
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return fail(ec, "shutdown");
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// If we get here then the connection is closed gracefully
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}
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};
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//------------------------------------------------------------------------------
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int main(int argc, char** argv)
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{
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// Check command line arguments.
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if(argc != 4 && argc != 5)
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{
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std::cerr <<
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"Usage: http-client-async-ssl-system-executor <host> <port> <target> [<HTTP version: 1.0 or 1.1(default)>]\n" <<
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"Example:\n" <<
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" http-client-async-ssl-system-executor www.example.com 443 /\n" <<
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" http-client-async-ssl-system-executor www.example.com 443 / 1.0\n";
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return EXIT_FAILURE;
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}
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auto const host = argv[1];
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auto const port = argv[2];
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auto const target = argv[3];
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int version = argc == 5 && !std::strcmp("1.0", argv[4]) ? 10 : 11;
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// The SSL context is required, and holds certificates
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ssl::context ctx{ssl::context::tlsv12_client};
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// This holds the root certificate used for verification
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load_root_certificates(ctx);
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// Verify the remote server's certificate
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ctx.set_verify_mode(ssl::verify_peer);
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// Launch the asynchronous operation
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std::make_shared<session>(ctx)->run(host, port, target, version);
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// The async operations will run on the system_executor.
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// Because the main thread has nothing to do in this example, we just wait
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// for the system_executor to run out of work.
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net::system_executor().context().join();
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return EXIT_SUCCESS;
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}
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