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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
#ifndef CEPH_LIBRBD_MIGRATION_HTTP_CLIENT_H
#define CEPH_LIBRBD_MIGRATION_HTTP_CLIENT_H
#include "include/common_fwd.h"
#include "include/int_types.h"
#include "librbd/io/Types.h"
#include "librbd/migration/HttpProcessorInterface.h"
#include "librbd/migration/Types.h"
#include <boost/asio/io_context.hpp>
#include <boost/asio/strand.hpp>
#include <boost/asio/ip/tcp.hpp>
#include <boost/asio/ssl/context.hpp>
#include <boost/beast/version.hpp>
#include <boost/beast/core/tcp_stream.hpp>
#include <boost/beast/http/empty_body.hpp>
#include <boost/beast/http/message.hpp>
#include <boost/beast/http/string_body.hpp>
#include <boost/beast/http/write.hpp>
#include <boost/beast/ssl/ssl_stream.hpp>
#include <functional>
#include <memory>
#include <string>
#include <utility>
struct Context;
namespace librbd {
struct AsioEngine;
struct ImageCtx;
namespace migration {
template <typename ImageCtxT>
class HttpClient {
public:
using EmptyBody = boost::beast::http::empty_body;
using StringBody = boost::beast::http::string_body;
using Request = boost::beast::http::request<EmptyBody>;
using Response = boost::beast::http::response<StringBody>;
using RequestPreprocessor = std::function<void(Request&)>;
static HttpClient* create(ImageCtxT* image_ctx, const std::string& url) {
return new HttpClient(image_ctx, url);
}
HttpClient(ImageCtxT* image_ctx, const std::string& url);
HttpClient(const HttpClient&) = delete;
HttpClient& operator=(const HttpClient&) = delete;
void open(Context* on_finish);
void close(Context* on_finish);
void get_size(uint64_t* size, Context* on_finish);
void read(io::Extents&& byte_extents, bufferlist* data,
Context* on_finish);
void set_ignore_self_signed_cert(bool ignore) {
m_ignore_self_signed_cert = ignore;
}
void set_http_processor(HttpProcessorInterface* http_processor) {
m_http_processor = http_processor;
}
template <class Body, typename Completion>
void issue(boost::beast::http::request<Body>&& request,
Completion&& completion) {
struct WorkImpl : Work {
HttpClient* http_client;
boost::beast::http::request<Body> request;
Completion completion;
WorkImpl(HttpClient* http_client,
boost::beast::http::request<Body>&& request,
Completion&& completion)
: http_client(http_client), request(std::move(request)),
completion(std::move(completion)) {
}
WorkImpl(const WorkImpl&) = delete;
WorkImpl& operator=(const WorkImpl&) = delete;
bool need_eof() const override {
return request.need_eof();
}
bool header_only() const override {
return (request.method() == boost::beast::http::verb::head);
}
void complete(int r, Response&& response) override {
completion(r, std::move(response));
}
void operator()(boost::beast::tcp_stream& stream) override {
preprocess_request();
boost::beast::http::async_write(
stream, request,
[http_session=http_client->m_http_session.get(),
work=this->shared_from_this()]
(boost::beast::error_code ec, std::size_t) mutable {
http_session->handle_issue(ec, std::move(work));
});
}
void operator()(
boost::beast::ssl_stream<boost::beast::tcp_stream>& stream) override {
preprocess_request();
boost::beast::http::async_write(
stream, request,
[http_session=http_client->m_http_session.get(),
work=this->shared_from_this()]
(boost::beast::error_code ec, std::size_t) mutable {
http_session->handle_issue(ec, std::move(work));
});
}
void preprocess_request() {
if (http_client->m_http_processor) {
http_client->m_http_processor->process_request(request);
}
}
};
initialize_default_fields(request);
issue(std::make_shared<WorkImpl>(this, std::move(request),
std::move(completion)));
}
private:
struct Work;
struct HttpSessionInterface {
virtual ~HttpSessionInterface() {}
virtual void init(Context* on_finish) = 0;
virtual void shut_down(Context* on_finish) = 0;
virtual void issue(std::shared_ptr<Work>&& work) = 0;
virtual void handle_issue(boost::system::error_code ec,
std::shared_ptr<Work>&& work) = 0;
};
struct Work : public std::enable_shared_from_this<Work> {
virtual ~Work() {}
virtual bool need_eof() const = 0;
virtual bool header_only() const = 0;
virtual void complete(int r, Response&&) = 0;
virtual void operator()(boost::beast::tcp_stream& stream) = 0;
virtual void operator()(
boost::beast::ssl_stream<boost::beast::tcp_stream>& stream) = 0;
};
template <typename D> struct HttpSession;
struct PlainHttpSession;
struct SslHttpSession;
CephContext* m_cct;
ImageCtxT* m_image_ctx;
std::shared_ptr<AsioEngine> m_asio_engine;
std::string m_url;
UrlSpec m_url_spec;
bool m_ignore_self_signed_cert = false;
HttpProcessorInterface* m_http_processor = nullptr;
boost::asio::strand<boost::asio::io_context::executor_type> m_strand;
boost::asio::ssl::context m_ssl_context;
std::unique_ptr<HttpSessionInterface> m_http_session;
template <typename Fields>
void initialize_default_fields(Fields& fields) const {
fields.target(m_url_spec.path);
fields.set(boost::beast::http::field::host, m_url_spec.host);
fields.set(boost::beast::http::field::user_agent,
BOOST_BEAST_VERSION_STRING);
}
void handle_get_size(int r, Response&& response, uint64_t* size,
Context* on_finish);
void handle_read(int r, Response&& response, uint64_t byte_offset,
uint64_t byte_length, bufferlist* data, Context* on_finish);
void issue(std::shared_ptr<Work>&& work);
void create_http_session(Context* on_finish);
void shut_down_http_session(Context* on_finish);
};
} // namespace migration
} // namespace librbd
extern template class librbd::migration::HttpClient<librbd::ImageCtx>;
#endif // CEPH_LIBRBD_MIGRATION_HTTP_CLIENT_H
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