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boost_beast/beast/http/impl/read.ipp
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Vinnie Falco 8b62c23ab6 Beast.HTTP: 
New classes are introduced to represent HTTP messages and their
associated bodies. The parser interface is reworked to use CRTP,
error codes, and trait checks.

New classes:

* basic_headers

  Models field/value pairs in a HTTP message.

* message

  Models a HTTP message, body behavior defined by template argument.
  Parsed message carries metadata generated during parsing.

* parser

  Produces parsed messages.

* empty_body, string_body, basic_streambuf_body

  Classes used to represent content bodies in various ways.

New functions:

* read, async_read, write, async_write

  Read and write HTTP messages on a socket.

New concepts:

* Body: Represents the HTTP Content-Body.
* Field: A HTTP header field.
* FieldSequence: A forward sequence of fields.
* Reader: Parses a Body from a stream of bytes.
* Writer: Serializes a Body to buffers.

basic_parser changes:

* add write methods which throw exceptions instead
* error_code passed via parameter instead of return value
* fold private member calls into existing callbacks
* basic_parser uses CRTP instead of virtual members
* add documentation on Derived requirements for CRTP

impl/http-parser changes:

* joyent renamed to nodejs to reflect upstream changes
2016-04-20 12:01:15 -04:00

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//------------------------------------------------------------------------------
/*
This file is part of Beast: https://github.com/vinniefalco/Beast
Copyright 2013, Vinnie Falco <vinnie.falco@gmail.com>
Permission to use, copy, modify, and/or distribute this software for any
purpose with or without fee is hereby granted, provided that the above
copyright notice and this permission notice appear in all copies.
THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
ANY SPECIAL , DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
//==============================================================================
#ifndef BEAST_HTTP_READ_IPP_H_INCLUDED
#define BEAST_HTTP_READ_IPP_H_INCLUDED
#include <beast/http/type_check.h>
#include <beast/asio/async_completion.h>
#include <beast/asio/bind_handler.h>
#include <beast/asio/handler_alloc.h>
#include <cassert>
namespace beast {
namespace http {
namespace detail {
template<class Stream, class Streambuf,
bool isRequest, class Body, class Headers,
class Handler>
class read_op
{
using alloc_type =
handler_alloc<char, Handler>;
using parser_type =
parser<isRequest, Body, Headers>;
using message_type =
message<isRequest, Body, Headers>;
struct data
{
Stream& s;
Streambuf& sb;
message_type& m;
parser_type p;
Handler h;
bool cont;
int state = 0;
template<class DeducedHandler>
data(DeducedHandler&& h_, Stream& s_,
Streambuf& sb_, message_type& m_)
: s(s_)
, sb(sb_)
, m(m_)
, h(std::forward<DeducedHandler>(h_))
, cont(boost_asio_handler_cont_helpers::
is_continuation(h))
{
}
};
std::shared_ptr<data> d_;
public:
read_op(read_op&&) = default;
read_op(read_op const&) = default;
template<class DeducedHandler, class... Args>
read_op(DeducedHandler&& h, Stream&s, Args&&... args)
: d_(std::allocate_shared<data>(alloc_type{h},
std::forward<DeducedHandler>(h), s,
std::forward<Args>(args)...))
{
(*this)(error_code{}, 0, false);
}
void
operator()(error_code ec,
std::size_t bytes_transferred, bool again = true);
friend
auto asio_handler_allocate(
std::size_t size, read_op* op)
{
return boost_asio_handler_alloc_helpers::
allocate(size, op->d_->h);
}
friend
auto asio_handler_deallocate(
void* p, std::size_t size, read_op* op)
{
return boost_asio_handler_alloc_helpers::
deallocate(p, size, op->d_->h);
}
friend
auto asio_handler_is_continuation(read_op* op)
{
return op->d_->cont;
}
template <class Function>
friend
auto asio_handler_invoke(Function&& f, read_op* op)
{
return boost_asio_handler_invoke_helpers::
invoke(f, op->d_->h);
}
};
template<class Stream, class Streambuf,
bool isRequest, class Body, class Headers,
class Handler>
void
read_op<Stream, Streambuf, isRequest, Body, Headers, Handler>::
operator()(error_code ec, std::size_t bytes_transferred, bool again)
{
auto& d = *d_;
d.cont = d.cont || again;
while(d.state != 99)
{
switch(d.state)
{
case 0:
{
auto const used =
d.p.write(d.sb.data(), ec);
if(ec)
{
// call handler
d.state = 99;
d.s.get_io_service().post(
bind_handler(std::move(*this), ec, 0));
return;
}
d.sb.consume(used);
if(d.p.complete())
{
// call handler
d.state = 99;
d.m = d.p.release();
d.s.get_io_service().post(
bind_handler(std::move(*this), ec, 0));
return;
}
d.state = 1;
break;
}
case 1:
// read
d.state = 2;
d.s.async_read_some(d.sb.prepare(
read_size_helper(d.sb, 65536)),
std::move(*this));
return;
// got data
case 2:
{
if(ec == boost::asio::error::eof)
{
if(! d.p.started())
{
// call handler
d.state = 99;
break;
}
// Caller will see eof on next read.
ec = {};
d.p.write_eof(ec);
if(! ec)
{
assert(d.p.complete());
d.m = d.p.release();
}
// call handler
d.state = 99;
break;
}
if(ec)
{
// call handler
d.state = 99;
break;
}
d.sb.commit(bytes_transferred);
d.sb.consume(d.p.write(d.sb.data(), ec));
if(ec)
{
// call handler
d.state = 99;
break;
}
if(d.p.complete())
{
// call handler
d.state = 99;
d.m = d.p.release();
break;
}
d.state = 1;
break;
}
}
}
d.h(ec);
}
} // detail
//------------------------------------------------------------------------------
template<class SyncReadStream, class Streambuf,
bool isRequest, class Body, class Headers>
void
read(SyncReadStream& stream, Streambuf& streambuf,
message<isRequest, Body, Headers>& m,
error_code& ec)
{
static_assert(is_SyncReadStream<SyncReadStream>::value,
"SyncReadStream requirements not met");
static_assert(is_Streambuf<Streambuf>::value,
"Streambuf requirements not met");
static_assert(is_ReadableBody<Body>::value,
"ReadableBody requirements not met");
parser<isRequest, Body, Headers> p;
for(;;)
{
auto used =
p.write(streambuf.data(), ec);
if(ec)
return;
streambuf.consume(used);
if(p.complete())
{
m = p.release();
break;
}
streambuf.commit(stream.read_some(
streambuf.prepare(read_size_helper(
streambuf, 65536)), ec));
if(ec && ec != boost::asio::error::eof)
return;
if(ec == boost::asio::error::eof)
{
if(! p.started())
return;
// Caller will see eof on next read.
ec = {};
p.write_eof(ec);
if(ec)
return;
assert(p.complete());
m = p.release();
break;
}
}
}
template<class AsyncReadStream, class Streambuf,
bool isRequest, class Body, class Headers,
class CompletionToken>
auto
async_read(AsyncReadStream& stream, Streambuf& streambuf,
message<isRequest, Body, Headers>& m,
CompletionToken&& token)
{
static_assert(is_AsyncReadStream<AsyncReadStream>::value,
"AsyncReadStream requirements not met");
static_assert(is_Streambuf<Streambuf>::value,
"Streambuf requirements not met");
static_assert(is_ReadableBody<Body>::value,
"ReadableBody requirements not met");
beast::async_completion<CompletionToken,
void(error_code)> completion(token);
detail::read_op<AsyncReadStream, Streambuf,
isRequest, Body, Headers, decltype(
completion.handler)>{completion.handler,
stream, streambuf, m};
return completion.result.get();
}
} // http
} // beast
#endif
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