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Refactor HTTP async read composed operations

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fix #810
This commit is contained in:
Vinnie Falco
2017-11-18 15:04:17 -08:00
parent 5ae15432b8
commit 75fcea69ee
3 changed files with 122 additions and 128 deletions
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1
CHANGELOG.md
View File

@ -2,6 +2,7 @@ Version 145:
* Rename some detail functions
* Refactor basic_fields allocator internals
* Refactor HTTP async read composed operations
--------------------------------------------------------------------------------

190
include/boost/beast/http/impl/read.ipp
View File

@ -20,6 +20,7 @@
#include <boost/beast/core/type_traits.hpp>
#include <boost/asio/associated_allocator.hpp>
#include <boost/asio/associated_executor.hpp>
#include <boost/asio/coroutine.hpp>
#include <boost/asio/handler_continuation_hook.hpp>
#include <boost/asio/post.hpp>
#include <boost/assert.hpp>
@ -38,15 +39,14 @@ namespace detail {
template<class Stream, class DynamicBuffer,
bool isRequest, class Derived, class Handler>
class read_some_op
: public boost::asio::coroutine
{
int state_ = 0;
Stream& s_;
DynamicBuffer& b_;
basic_parser<isRequest, Derived>& p_;
boost::optional<typename
DynamicBuffer::mutable_buffers_type> mb_;
std::size_t bytes_transferred_ = 0;
Handler h_;
bool cont_ = false;
public:
read_some_op(read_some_op&&) = default;
@ -83,14 +83,15 @@ public:
void
operator()(
error_code ec = {},
std::size_t bytes_transferred = 0);
error_code ec,
std::size_t bytes_transferred = 0,
bool cont = true);
friend
bool asio_handler_is_continuation(read_some_op* op)
{
using boost::asio::asio_handler_is_continuation;
return op->state_ >= 2 ? true :
return op->cont_ ? true :
asio_handler_is_continuation(
std::addressof(op->h_));
}
@ -103,19 +104,40 @@ read_some_op<Stream, DynamicBuffer,
isRequest, Derived, Handler>::
operator()(
error_code ec,
std::size_t bytes_transferred)
std::size_t bytes_transferred,
bool cont)
{
switch(state_)
cont_ = cont;
boost::optional<typename
DynamicBuffer::mutable_buffers_type> mb;
BOOST_ASIO_CORO_REENTER(*this)
{
case 0:
state_ = 1;
if(b_.size() == 0)
goto do_read;
goto do_parse;
for(;;)
{
// parse
{
auto const used = p_.put(b_.data(), ec);
bytes_transferred_ += used;
b_.consume(used);
}
if(ec != http::error::need_more)
break;
case 1:
state_ = 2;
case 2:
do_read:
try
{
mb.emplace(b_.prepare(
read_size_or_throw(b_, 65536)));
}
catch(std::length_error const&)
{
ec = error::buffer_overflow;
break;
}
BOOST_ASIO_CORO_YIELD
s_.async_read_some(*mb, std::move(*this));
if(ec == boost::asio::error::eof)
{
BOOST_ASSERT(bytes_transferred == 0);
@ -130,48 +152,21 @@ operator()(
goto upcall;
}
ec = error::end_of_stream;
goto upcall;
}
if(ec)
goto upcall;
b_.commit(bytes_transferred);
do_parse:
{
auto const used = p_.put(b_.data(), ec);
bytes_transferred_ += used;
b_.consume(used);
if(! ec || ec != http::error::need_more)
goto do_upcall;
ec.assign(0, ec.category());
}
do_read:
try
{
mb_.emplace(b_.prepare(
read_size_or_throw(b_, 65536)));
}
catch(std::length_error const&)
{
ec = error::buffer_overflow;
goto do_upcall;
}
return s_.async_read_some(*mb_, std::move(*this));
do_upcall:
if(state_ >= 2)
goto upcall;
state_ = 3;
return boost::asio::post(
s_.get_executor(),
bind_handler(std::move(*this), ec, 0));
case 3:
break;
}
upcall:
if(ec)
break;
b_.commit(bytes_transferred);
}
upcall:
if(! cont_)
return boost::asio::post(
s_.get_executor(),
bind_handler(std::move(h_),
ec, bytes_transferred_));
h_(ec, bytes_transferred_);
}
}
//------------------------------------------------------------------------------
@ -202,13 +197,14 @@ template<class Stream, class DynamicBuffer,
bool isRequest, class Derived, class Condition,
class Handler>
class read_op
: public boost::asio::coroutine
{
int state_ = 0;
Stream& s_;
DynamicBuffer& b_;
basic_parser<isRequest, Derived>& p_;
std::size_t bytes_transferred_ = 0;
Handler h_;
bool cont_ = false;
public:
read_op(read_op&&) = default;
@ -246,14 +242,15 @@ public:
void
operator()(
error_code ec = {},
std::size_t bytes_transferred = 0);
error_code ec,
std::size_t bytes_transferred = 0,
bool cont = true);
friend
bool asio_handler_is_continuation(read_op* op)
{
using boost::asio::asio_handler_is_continuation;
return op->state_ >= 3 ? true :
return op->cont_ ? true :
asio_handler_is_continuation(
std::addressof(op->h_));
}
@ -267,39 +264,33 @@ read_op<Stream, DynamicBuffer,
isRequest, Derived, Condition, Handler>::
operator()(
error_code ec,
std::size_t bytes_transferred)
std::size_t bytes_transferred,
bool cont)
{
switch(state_)
cont_ = cont;
BOOST_ASIO_CORO_REENTER(*this)
{
case 0:
if(Condition{}(p_))
{
state_ = 1;
return boost::asio::post(
s_.get_executor(),
BOOST_ASIO_CORO_YIELD
boost::asio::post(s_.get_executor(),
bind_handler(std::move(*this), ec));
}
state_ = 2;
do_read:
return async_read_some(
s_, b_, p_, std::move(*this));
case 1:
goto upcall;
case 2:
case 3:
}
for(;;)
{
BOOST_ASIO_CORO_YIELD
async_read_some(
s_, b_, p_, std::move(*this));
if(ec)
goto upcall;
bytes_transferred_ += bytes_transferred;
if(Condition{}(p_))
goto upcall;
state_ = 3;
goto do_read;
}
upcall:
upcall:
h_(ec, bytes_transferred_);
}
}
//------------------------------------------------------------------------------
@ -308,6 +299,7 @@ template<class Stream, class DynamicBuffer,
bool isRequest, class Body, class Allocator,
class Handler>
class read_msg_op
: public boost::asio::coroutine
{
using parser_type =
parser<isRequest, Body, Allocator>;
@ -317,12 +309,12 @@ class read_msg_op
struct data
{
int state = 0;
Stream& s;
DynamicBuffer& b;
message_type& m;
parser_type p;
std::size_t bytes_transferred = 0;
bool cont = false;
data(Handler&, Stream& s_,
DynamicBuffer& b_, message_type& m_)
@ -369,14 +361,15 @@ public:
void
operator()(
error_code ec = {},
std::size_t bytes_transferred = 0);
error_code ec,
std::size_t bytes_transferred = 0,
bool cont = true);
friend
bool asio_handler_is_continuation(read_msg_op* op)
{
using boost::asio::asio_handler_is_continuation;
return op->d_->state >= 2 ? true :
return op->d_->cont ? true :
asio_handler_is_continuation(
std::addressof(op->d_.handler()));
}
@ -390,20 +383,18 @@ read_msg_op<Stream, DynamicBuffer,
isRequest, Body, Allocator, Handler>::
operator()(
error_code ec,
std::size_t bytes_transferred)
std::size_t bytes_transferred,
bool cont)
{
auto& d = *d_;
switch(d.state)
d.cont = cont;
BOOST_ASIO_CORO_REENTER(*this)
{
case 0:
d.state = 1;
do_read:
return async_read_some(
for(;;)
{
BOOST_ASIO_CORO_YIELD
async_read_some(
d.s, d.b, d.p, std::move(*this));
case 1:
case 2:
if(ec)
goto upcall;
d.bytes_transferred +=
@ -413,12 +404,11 @@ operator()(
d.m = d.p.release();
goto upcall;
}
d.state = 2;
goto do_read;
}
upcall:
upcall:
bytes_transferred = d.bytes_transferred;
d_.invoke(ec, bytes_transferred);
}
}
} // detail
@ -541,7 +531,8 @@ async_read_some(
detail::read_some_op<AsyncReadStream,
DynamicBuffer, isRequest, Derived, BOOST_ASIO_HANDLER_TYPE(
ReadHandler, void(error_code, std::size_t))>{
init.completion_handler, stream, buffer, parser}();
init.completion_handler, stream, buffer, parser}(
{}, 0, false);
return init.result.get();
}
@ -628,7 +619,8 @@ async_read_header(
detail::read_op<AsyncReadStream, DynamicBuffer,
isRequest, Derived, detail::parser_is_header_done,
BOOST_ASIO_HANDLER_TYPE(ReadHandler, void(error_code, std::size_t))>{
init.completion_handler, stream, buffer, parser}();
init.completion_handler, stream, buffer, parser}(
{}, 0, false);
return init.result.get();
}
@ -716,7 +708,8 @@ async_read(
detail::read_op<AsyncReadStream, DynamicBuffer,
isRequest, Derived, detail::parser_is_done,
BOOST_ASIO_HANDLER_TYPE(ReadHandler, void(error_code, std::size_t))>{
init.completion_handler, stream, buffer, parser}();
init.completion_handler, stream, buffer, parser}(
{}, 0, false);
return init.result.get();
}
@ -810,7 +803,8 @@ async_read(
isRequest, Body, Allocator,
BOOST_ASIO_HANDLER_TYPE(
ReadHandler, void(error_code, std::size_t))>{
init.completion_handler, stream, buffer, msg}();
init.completion_handler, stream, buffer, msg}(
{}, 0, false);
return init.result.get();
}

1
include/boost/beast/websocket/impl/write.ipp
View File

@ -14,7 +14,6 @@
#include <boost/beast/core/buffers_cat.hpp>
#include <boost/beast/core/buffers_prefix.hpp>
#include <boost/beast/core/buffers_suffix.hpp>
#include <boost/beast/core/handler_ptr.hpp>
#include <boost/beast/core/flat_static_buffer.hpp>
#include <boost/beast/core/type_traits.hpp>
#include <boost/beast/core/detail/clamp.hpp>