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//
// Copyright (c) 2016-2019 Vinnie Falco (vinnie dot falco at gmail 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
//
#ifndef BOOST_BEAST_IMPL_BUFFERED_READ_STREAM_HPP
#define BOOST_BEAST_IMPL_BUFFERED_READ_STREAM_HPP
#include <boost/beast/core/async_base.hpp>
#include <boost/beast/core/bind_handler.hpp>
#include <boost/beast/core/error.hpp>
#include <boost/beast/core/read_size.hpp>
#include <boost/beast/core/stream_traits.hpp>
#include <boost/beast/core/detail/type_traits.hpp>
#include <boost/asio/post.hpp>
#include <boost/throw_exception.hpp>
namespace boost {
namespace beast {
template<class Stream, class DynamicBuffer>
struct buffered_read_stream<Stream, DynamicBuffer>::ops
{
template<class MutableBufferSequence, class Handler>
class read_op
: public async_base<Handler,
beast::executor_type<buffered_read_stream>>
{
buffered_read_stream& s_;
MutableBufferSequence b_;
int step_ = 0;
public:
read_op(read_op&&) = default;
read_op(read_op const&) = delete;
template<class Handler_>
read_op(
Handler_&& h,
buffered_read_stream& s,
MutableBufferSequence const& b)
: async_base<
Handler, beast::executor_type<buffered_read_stream>>(
std::forward<Handler_>(h), s.get_executor())
, s_(s)
, b_(b)
{
(*this)({}, 0);
}
void
operator()(
error_code ec,
std::size_t bytes_transferred)
{
// VFALCO TODO Rewrite this using reenter/yield
switch(step_)
{
case 0:
if(s_.buffer_.size() == 0)
{
if(s_.capacity_ == 0)
{
// read (unbuffered)
step_ = 1;
return s_.next_layer_.async_read_some(
b_, std::move(*this));
}
// read
step_ = 2;
return s_.next_layer_.async_read_some(
s_.buffer_.prepare(read_size(
s_.buffer_, s_.capacity_)),
std::move(*this));
}
step_ = 3;
return net::post(
s_.get_executor(),
beast::bind_front_handler(
std::move(*this), ec, 0));
case 1:
// upcall
break;
case 2:
s_.buffer_.commit(bytes_transferred);
BOOST_FALLTHROUGH;
case 3:
bytes_transferred =
net::buffer_copy(b_, s_.buffer_.data());
s_.buffer_.consume(bytes_transferred);
break;
}
this->complete_now(ec, bytes_transferred);
}
};
struct run_read_op
{
template<class ReadHandler, class Buffers>
void
operator()(
ReadHandler&& h,
buffered_read_stream* s,
Buffers const& b)
{
// If you get an error on the following line it means
// that your handler does not meet the documented type
// requirements for the handler.
static_assert(
beast::detail::is_invocable<ReadHandler,
void(error_code, std::size_t)>::value,
"ReadHandler type requirements not met");
read_op<
Buffers,
typename std::decay<ReadHandler>::type>(
std::forward<ReadHandler>(h), *s, b);
}
};
};
//------------------------------------------------------------------------------
template<class Stream, class DynamicBuffer>
template<class... Args>
buffered_read_stream<Stream, DynamicBuffer>::
buffered_read_stream(Args&&... args)
: next_layer_(std::forward<Args>(args)...)
{
}
template<class Stream, class DynamicBuffer>
template<class ConstBufferSequence, class WriteHandler>
BOOST_BEAST_ASYNC_RESULT2(WriteHandler)
buffered_read_stream<Stream, DynamicBuffer>::
async_write_some(
ConstBufferSequence const& buffers,
WriteHandler&& handler)
{
static_assert(is_async_write_stream<next_layer_type>::value,
"AsyncWriteStream type requirements not met");
static_assert(net::is_const_buffer_sequence<
ConstBufferSequence>::value,
"ConstBufferSequence type requirements not met");
static_assert(detail::is_invocable<WriteHandler,
void(error_code, std::size_t)>::value,
"WriteHandler type requirements not met");
return next_layer_.async_write_some(buffers,
std::forward<WriteHandler>(handler));
}
template<class Stream, class DynamicBuffer>
template<class MutableBufferSequence>
std::size_t
buffered_read_stream<Stream, DynamicBuffer>::
read_some(
MutableBufferSequence const& buffers)
{
static_assert(is_sync_read_stream<next_layer_type>::value,
"SyncReadStream type requirements not met");
static_assert(net::is_mutable_buffer_sequence<
MutableBufferSequence>::value,
"MutableBufferSequence type requirements not met");
error_code ec;
auto n = read_some(buffers, ec);
if(ec)
BOOST_THROW_EXCEPTION(system_error{ec});
return n;
}
template<class Stream, class DynamicBuffer>
template<class MutableBufferSequence>
std::size_t
buffered_read_stream<Stream, DynamicBuffer>::
read_some(MutableBufferSequence const& buffers,
error_code& ec)
{
static_assert(is_sync_read_stream<next_layer_type>::value,
"SyncReadStream type requirements not met");
static_assert(net::is_mutable_buffer_sequence<
MutableBufferSequence>::value,
"MutableBufferSequence type requirements not met");
if(buffer_.size() == 0)
{
if(capacity_ == 0)
return next_layer_.read_some(buffers, ec);
buffer_.commit(next_layer_.read_some(
buffer_.prepare(read_size(buffer_,
capacity_)), ec));
if(ec)
return 0;
}
else
{
ec = {};
}
auto bytes_transferred =
net::buffer_copy(buffers, buffer_.data());
buffer_.consume(bytes_transferred);
return bytes_transferred;
}
template<class Stream, class DynamicBuffer>
template<class MutableBufferSequence, class ReadHandler>
BOOST_BEAST_ASYNC_RESULT2(ReadHandler)
buffered_read_stream<Stream, DynamicBuffer>::
async_read_some(
MutableBufferSequence const& buffers,
ReadHandler&& handler)
{
static_assert(is_async_read_stream<next_layer_type>::value,
"AsyncReadStream type requirements not met");
static_assert(net::is_mutable_buffer_sequence<
MutableBufferSequence>::value,
"MutableBufferSequence type requirements not met");
if(buffer_.size() == 0 && capacity_ == 0)
return next_layer_.async_read_some(buffers,
std::forward<ReadHandler>(handler));
return net::async_initiate<
ReadHandler,
void(error_code, std::size_t)>(
typename ops::run_read_op{},
handler,
this,
buffers);
}
} // beast
} // boost
#endif
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