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Add const and non-const overloads for message based http writes:

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fix #1113

This solves a problem where the message-oriented synchronous
HTTP write algorithms do not support messages whose body
writer requires a non-const reference to the message in
order to construct.

In addition, the message-oriented async_write algorithm is
modified to support messages passed by const reference when
possible, based on the body writer attributes.
This commit is contained in:
Vinnie Falco
2018-05-06 19:57:25 -07:00
parent 07aead170a
commit 24bbda7b0d
4 changed files with 373 additions and 8 deletions
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test/beast/http/write.cpp
+108 -4
View File
@@ -50,8 +50,9 @@ public:
boost::asio::const_buffer;
template<bool isRequest, class Fields>
explicit
writer(header<isRequest, Fields> const&, value_type const& b)
writer(
header<isRequest, Fields> const&,
value_type const& b)
: body_(b)
{
}
@@ -94,8 +95,9 @@ public:
boost::asio::const_buffer;
template<bool isRequest, class Fields>
explicit
writer(header<isRequest, Fields> const&, value_type const& b)
writer(
header<isRequest, Fields> const&,
value_type const& b)
: body_(b)
{
}
@@ -890,6 +892,107 @@ public:
}
}
struct const_body_writer
{
struct value_type{};
struct writer
{
using const_buffers_type =
boost::asio::const_buffer;
template<bool isRequest, class Fields>
writer(
header<isRequest, Fields> const&,
value_type const&)
{
}
void
init(error_code& ec)
{
ec.assign(0, ec.category());
}
boost::optional<std::pair<const_buffers_type, bool>>
get(error_code& ec)
{
ec.assign(0, ec.category());
return {{const_buffers_type{"", 0}, false}};
}
};
};
struct mutable_body_writer
{
struct value_type{};
struct writer
{
using const_buffers_type =
boost::asio::const_buffer;
template<bool isRequest, class Fields>
writer(
header<isRequest, Fields>&,
value_type&)
{
}
void
init(error_code& ec)
{
ec.assign(0, ec.category());
}
boost::optional<std::pair<const_buffers_type, bool>>
get(error_code& ec)
{
ec.assign(0, ec.category());
return {{const_buffers_type{"", 0}, false}};
}
};
};
void
testBodyWriters()
{
{
test::stream s{ioc_};
message<true, const_body_writer> m;
try
{
write(s, m);
}
catch(std::exception const&)
{
}
}
{
error_code ec;
test::stream s{ioc_};
message<true, const_body_writer> m;
write(s, m, ec);
}
{
test::stream s{ioc_};
message<true, mutable_body_writer> m;
try
{
write(s, m);
}
catch(std::exception const&)
{
}
}
{
error_code ec;
test::stream s{ioc_};
message<true, mutable_body_writer> m;
write(s, m, ec);
}
}
void
run() override
{
@@ -912,6 +1015,7 @@ public:
testWriteStream<test_body< true, true>>(yield);
});
testAsioHandlerInvoke();
testBodyWriters();
}
};