forked from boostorg/beast
138 lines
3.2 KiB
C++
138 lines
3.2 KiB
C++
//
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// Copyright (c) 2013-2016 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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#ifndef BEAST_WEBSOCKET_IMPL_WRITE_OP_HPP
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#define BEAST_WEBSOCKET_IMPL_WRITE_OP_HPP
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#include <beast/core/consuming_buffers.hpp>
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#include <beast/core/prepare_buffers.hpp>
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#include <beast/core/handler_alloc.hpp>
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#include <beast/websocket/detail/frame.hpp>
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#include <algorithm>
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#include <cassert>
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#include <memory>
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namespace beast {
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namespace websocket {
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// write a message
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//
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template<class NextLayer>
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template<class Buffers, class Handler>
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class stream<NextLayer>::write_op
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{
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using alloc_type =
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handler_alloc<char, Handler>;
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struct data : op
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{
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stream<NextLayer>& ws;
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consuming_buffers<Buffers> cb;
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Handler h;
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std::size_t remain;
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bool cont;
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int state = 0;
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template<class DeducedHandler>
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data(DeducedHandler&& h_,
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stream<NextLayer>& ws_, Buffers const& bs)
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: ws(ws_)
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, cb(bs)
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, h(std::forward<DeducedHandler>(h_))
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, remain(boost::asio::buffer_size(cb))
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, cont(boost_asio_handler_cont_helpers::
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is_continuation(h))
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{
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}
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};
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std::shared_ptr<data> d_;
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public:
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write_op(write_op&&) = default;
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write_op(write_op const&) = default;
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template<class DeducedHandler, class... Args>
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explicit
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write_op(DeducedHandler&& h,
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stream<NextLayer>& ws, Args&&... args)
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: d_(std::allocate_shared<data>(alloc_type{h},
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std::forward<DeducedHandler>(h), ws,
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std::forward<Args>(args)...))
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{
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(*this)(error_code{}, false);
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}
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void operator()(error_code ec, bool again = true);
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friend
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void* asio_handler_allocate(
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std::size_t size, write_op* op)
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{
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return boost_asio_handler_alloc_helpers::
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allocate(size, op->d_->h);
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}
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friend
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void asio_handler_deallocate(
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void* p, std::size_t size, write_op* op)
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{
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return boost_asio_handler_alloc_helpers::
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deallocate(p, size, op->d_->h);
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}
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friend
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bool asio_handler_is_continuation(write_op* op)
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{
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return op->d_->cont;
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}
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template <class Function>
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friend
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void asio_handler_invoke(Function&& f, write_op* op)
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{
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return boost_asio_handler_invoke_helpers::
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invoke(f, op->d_->h);
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}
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};
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template<class NextLayer>
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template<class Buffers, class Handler>
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void
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stream<NextLayer>::
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write_op<Buffers, Handler>::
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operator()(error_code ec, bool again)
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{
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auto& d = *d_;
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d.cont = d.cont || again;
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while(! ec && d.state != 99)
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{
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switch(d.state)
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{
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case 0:
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{
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auto const n = std::min(
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d.remain, d.ws.wr_frag_size_);
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d.remain -= n;
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auto const fin = d.remain <= 0;
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if(fin)
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d.state = 99;
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auto const pb = prepare_buffers(n, d.cb);
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d.cb.consume(n);
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d.ws.async_write_frame(fin, pb, std::move(*this));
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return;
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}
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}
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}
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d.h(ec);
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}
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} // websocket
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} // beast
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#endif
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