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Code Issues Releases Wiki Activity

ircd::server: Eliminate buffer constructions which lose window size information.

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This commit is contained in:
Jason Volk 2019-12-31 14:14:28 -08:00
parent 1245101a5b
commit 31eab7d235
1 changed files with 36 additions and 44 deletions
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80
ircd/server.cc
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@ -2106,7 +2106,7 @@ ircd::server::link::process_write_next(const const_buffer &buffer)
assert(bytes <= size(buffer));
const const_buffer written
{
data(buffer), bytes
buffer, bytes
};
assert(peer);
@ -2283,7 +2283,7 @@ try
const mutable_buffer remaining
{
data(buffer) + copied, size(buffer) - copied
buffer + copied
};
const const_buffer view
@ -2322,7 +2322,7 @@ ircd::server::link::read(const mutable_buffer &buf)
assert(received <= size(buf));
return const_buffer
{
data(buf), received
buf, received
};
}
@ -2630,7 +2630,7 @@ noexcept
{
const const_buffer src
{
data(request.out.head) + tag.state.written, size(request.out.head) - tag.state.written
request.out.head + tag.state.written
};
const mutable_buffer dst
@ -2652,7 +2652,7 @@ noexcept
{
const const_buffer src
{
data(request.out.content) + content_written, size(request.out.content) - content_written
request.out.content + content_written
};
const mutable_buffer dst
@ -2669,12 +2669,12 @@ noexcept
{
const const_buffer src
{
data(request.in.head), tag.state.head_read
request.in.head, tag.state.head_read
};
const mutable_buffer dst
{
data(in_head), size(in_head)
in_head
};
copy(dst, src);
@ -2689,7 +2689,7 @@ noexcept
assert(tag.state.content_read >= tag.state.content_length);
const const_buffer src
{
data(request.in.content) + tag.state.content_length,
request.in.content + tag.state.content_length,
tag.state.content_read - tag.state.content_length
};
@ -2802,7 +2802,7 @@ ircd::server::tag::wrote_buffer(const const_buffer &buffer)
// Invoke the user's optional progress callback; this function
// should be marked noexcept and has no reason to throw yet.
if(req.out.progress)
req.out.progress(buffer, const_buffer{data(req.out.content), state.written});
req.out.progress(buffer, const_buffer{req.out.content, state.written});
}
else
{
@ -2834,14 +2834,9 @@ const
assert(request);
const auto &req{*request};
const size_t remain
{
size(req.out.head) - state.written
};
const const_buffer window
{
data(req.out.head) + state.written, remain
req.out.head + state.written
};
return window;
@ -2853,8 +2848,8 @@ const
{
assert(request);
const auto &req{*request};
assert(state.written >= size(req.out.head));
assert(state.written >= size(req.out.head));
const size_t content_offset
{
state.written - size(req.out.head)
@ -2867,7 +2862,7 @@ const
const const_buffer window
{
data(req.out.content) + content_offset, remain
req.out.content + content_offset, remain
};
return window;
@ -2974,7 +2969,7 @@ ircd::server::tag::read_head(const const_buffer &buffer,
// Window on any data in the buffer after the head.
const const_buffer beyond_head
{
data(req.in.head) + head_read, beyond_head_len
req.in.head + head_read, beyond_head_len
};
// Before changing the user's head buffer, we branch for a feature that
@ -2997,7 +2992,7 @@ ircd::server::tag::read_head(const const_buffer &buffer,
state.head_rem = size(req.in.head) - head_read;
req.in.head = mutable_buffer
{
data(req.in.head), head_read
req.in.head, head_read
};
// Setup the capstan and mark the end of the tape
@ -3045,7 +3040,7 @@ ircd::server::tag::read_head(const const_buffer &buffer,
const const_buffer chunk
{
!dynamic?
const_buffer{data(req.in.content), move(req.in.content, beyond_head)}:
const_buffer{req.in.content, move(req.in.content, beyond_head)}:
beyond_head
};
@ -3102,7 +3097,7 @@ ircd::server::tag::read_head(const const_buffer &buffer,
// Anything remaining is not our response and must be given back.
const const_buffer overrun
{
data(beyond_head) + size(partial_content), beyond_content_len
beyond_head + size(partial_content), beyond_content_len
};
// Reduce the user's content buffer to the content-length. This is sort of
@ -3111,7 +3106,7 @@ ircd::server::tag::read_head(const const_buffer &buffer,
// find the given content-length by parsing the header.
req.in.content = mutable_buffer
{
data(req.in.content), std::min(state.content_length, size(req.in.content))
req.in.content, state.content_length
};
// Any partial content was written to the head buffer by accident,
@ -3157,7 +3152,7 @@ ircd::server::tag::read_content(const const_buffer &buffer,
// Invoke the user's optional progress callback; this function
// should be marked noexcept for the time being.
if(req.in.progress)
req.in.progress(buffer, const_buffer{data(content), state.content_read});
req.in.progress(buffer, const_buffer{content, state.content_read});
// Not finished with content
if(likely(state.content_read != size(content) + content_overflow()))
@ -3239,7 +3234,7 @@ ircd::server::tag::read_chunk_head(const const_buffer &buffer,
// Window on any data in the buffer after the head.
const const_buffer beyond_head
{
data(content) + state.content_length + head_length, beyond_head_length
content + state.content_length + head_length, beyond_head_length
};
// Setup the capstan and mark the end of the tape
@ -3247,7 +3242,7 @@ ircd::server::tag::read_chunk_head(const const_buffer &buffer,
{
mutable_buffer
{
data(content) + state.content_length, head_length
content + state.content_length, head_length
}
};
parse::capstan pc{pb};
@ -3274,7 +3269,7 @@ ircd::server::tag::read_chunk_head(const const_buffer &buffer,
// after it.
const mutable_buffer target
{
data(content) + state.content_length, beyond_head_length
content + state.content_length, beyond_head_length
};
assert(!empty(target));
@ -3288,12 +3283,12 @@ ircd::server::tag::read_chunk_head(const const_buffer &buffer,
const const_buffer partial_chunk
{
data(target), chunk_read
target, chunk_read
};
const const_buffer overrun
{
data(target) + chunk_read, beyond_chunk_length
target + chunk_read, beyond_chunk_length
};
assert(state.chunk_length >= 2);
@ -3340,7 +3335,7 @@ ircd::server::tag::read_chunk_content(const const_buffer &buffer,
// Invoke the user's optional progress callback; this function
// should be marked noexcept for the time being.
if(req.in.progress && !done)
req.in.progress(buffer, const_buffer{data(content), state.content_read});
req.in.progress(buffer, const_buffer{content, state.content_read});
// This branch is taken at the completion of a chunk. The size
// all the buffers is rolled back to hide the terminator so it's
@ -3391,7 +3386,7 @@ ircd::server::chunk_content_completed(tag &tag,
assert(state.chunk_read == 0);
assert(!done);
done = true;
req.in.content = mutable_buffer{data(req.in.content), state.content_length};
req.in.content = mutable_buffer{req.in.content, state.content_length};
tag.set_value(state.status);
}
@ -3457,7 +3452,7 @@ ircd::server::tag::read_chunk_dynamic_head(const const_buffer &buffer,
// Window on any data in the buffer after the head.
const const_buffer beyond_head
{
data(buffer) + addl_head_bytes, beyond_head_length
buffer + addl_head_bytes, beyond_head_length
};
// Setup the capstan and mark the end of the tape
@ -3465,7 +3460,7 @@ ircd::server::tag::read_chunk_dynamic_head(const const_buffer &buffer,
{
mutable_buffer
{
data(req.in.head) + state.head_read, head_length
req.in.head + state.head_read, head_length
}
};
parse::capstan pc{pb};
@ -3502,7 +3497,7 @@ ircd::server::tag::read_chunk_dynamic_head(const const_buffer &buffer,
const const_buffer partial_chunk
{
data(beyond_head), chunk_read
beyond_head, chunk_read
};
const size_t copied
@ -3512,7 +3507,7 @@ ircd::server::tag::read_chunk_dynamic_head(const const_buffer &buffer,
const const_buffer overrun
{
data(beyond_head) + chunk_read, beyond_chunk_length
beyond_head + chunk_read, beyond_chunk_length
};
assert(state.chunk_length >= 2);
@ -3569,7 +3564,7 @@ ircd::server::tag::read_chunk_dynamic_content(const const_buffer &buffer,
// Invoke the user's optional progress callback; this function
// should be marked noexcept for the time being.
if(req.in.progress && !done)
req.in.progress(buffer, const_buffer{data(chunk), state.chunk_read});
req.in.progress(buffer, const_buffer{chunk, state.chunk_read});
if(state.chunk_read == state.chunk_length)
chunk_dynamic_content_completed(*this, done);
@ -3734,7 +3729,7 @@ const
const mutable_buffer buffer
{
data(head) + state.head_read, remaining
head + state.head_read, remaining
};
assert(size(buffer) <= size(head));
@ -3758,16 +3753,13 @@ const
};
// The amount of bytes we still have to read to for the response
const size_t remaining
const mutable_buffer buffer
{
size(content) - state.content_read
content + state.content_read
};
assert(remaining > 0);
return
{
data(content) + state.content_read, remaining
};
assert(!empty(buffer));
return buffer;
}
/// The chunk head buffer starts after the last chunk ended and has a size of
@ -3848,7 +3840,7 @@ const
const mutable_buffer buffer
{
data(content) + state.content_read, buffer_size
content + state.content_read, buffer_size
};
assert(!empty(buffer));