fix(ffi): Change hyper_headers_foreach to iterate in recieved order #2798

liamwarfield · 2022-03-30T00:52:50Z

Libcurl expects that headers are iterated in the same order that they
are recieved. Previously this caused curl tests 580 and 581 to fail.

SUMMARY OF CHANGES: Add a new data structure to HeaderCaseMap that
represents the order in which headers originally appear in a HTTP
message. This datastructure is Vec<(Headername, multimap-index)>.
This vector is ordered by the order which headers were recieved.
This new datastucture is used in hyper_headers_foreach to iterate
through headers in the correct order.

CLOSES ISSUE: #2780
BEAKING CHANGE: HeaderCaseMap::append now requires that names passed
into it impl Into + Clone. Currently all types that impl
IntoHeaderName (in hyper and http) also impl these traits already.

liamwarfield · 2022-03-30T00:54:04Z

There a few things that still need to be done here (like testing), but this is here so that I can get some comments.

seanmonstar · 2022-03-30T02:27:29Z

Thanks for working on this! A couple of thoughts:

Since the HeaderCaseMap is used by things that don't need this specific functionality, I think it's best to create a separate type.
It's probably even a good idea to make this not the default in the C API, but make it a connection option.

I can explain more about either point if you want.

liamwarfield · 2022-03-30T14:39:53Z

I think you're right about breaking things out into another type. As for how to separate this out in the c api, how does this sound:

add HeaderOrder type to hyper_headers

pub struct hyper_headers {
    pub(super) headers: HeaderMap,
    orig_casing: HeaderCaseMap,
    orig_order: OriginalHeaderOrder,
}

Add a new function called hyper_headers_foreach_ordered, and revert hyper_headers_foreach to its original implementation.

Could you elaborate on how connection options work?
Are there any performance tests in hyper?

liamwarfield · 2022-03-30T16:15:51Z

I did some digging into the other places that HeaderCaseMap is used. Its mostly used in the h1 to represent the original headers received.

From a memory overhead prospective, HeaderCaseMap is only tacked on to a request's Extensions if preserve_header_case == true, so adding more data HeaderCaseMap should not impact most users.
From a CPU time perspective, HeaderCaseMap is only really used when parsing and encoding h1 requests. Both of those code paths are marked as cold.

hyper/src/proto/h1/role.rs

Line 512 in 53f15e5

fn encode_headers_with_original_case(

hyper/src/proto/h1/role.rs

Line 1405 in 53f15e5

fn write_headers_original_case(

Does this change anything about you opinion here?

As far as making a new connection option goes, how does does something along the lines of preserve_header_order?

liamwarfield · 2022-03-31T03:22:52Z

Just pushed up a commit for adding a new connection option. My plan is to squash all my commits once I have something that we want to merge.

seanmonstar · 2022-03-31T19:43:49Z

Awesome, I'll review this afternoon. The other uses so far are proxies that enable the option, and then pass the extension on to an inner service. For instance, @nox did some work to make that possible for a proxy he supports. There is an issue filed here about exposing the extension publicly to make it more available.

seanmonstar

Hey, this is really good work. Really! ❤️

I left some thoughts inline.

src/ext.rs

src/client/conn.rs

src/ffi/client.rs

src/ext.rs

Libcurl expects that headers are iterated in the same order that they are recieved. Previously this caused curl tests 580 and 581 to fail. This necessitated exposing a way to preserve the original ordering of http headers. SUMMARY OF CHANGES: Add a new data structure called OriginalHeaderOrder that represents the order in which headers originally appear in a HTTP message. This datastructure is `Vec<(Headername, multimap-index)>`. This vector is ordered by the order which headers were recieved. Add the following ffi functions: - ffi::client::hyper_clientconn_options_set_preserve_header_order : An ffi interface to configure a connection to preserve header order. - ffi::client::hyper_clientconn_options_set_preserve_header_case : An ffi interface to configure a connection to preserve header case. - ffi::http_types::hyper_headers_foreach_ordered : Iterates the headers in the order the were recieved, passing each name and value pair to the callback. Add a new option to ParseContext, and Conn::State called `preserve_header_order`. This option, and all the code paths it creates are behind the `ffi` feature flag. This should not change performance of response parsing for non-ffi users. CLOSES ISSUE: hyperium#2780

liamwarfield

Did a quick review while squashing.

src/ffi/client.rs

src/ffi/http_types.rs

…ders_foreach_ordered hyper_headers_foreach_ordered was merged into hyper_headers_foreach. OriginalHeaderOrder docs were given examples OriginalHeaderOrder has named members for better clarity. BREAKING CHANGE: ffi::client::hyper_clientconn_options_new no longer sets the http1_preserve_header_case connection option by default. Users should now call ffi::client::hyper_clientconn_options_set_preserve_header_order if they desire that functionality

Hyper will have be able to preserve header order once this PR merges: hyperium/hyper#2798 This commit adds a few lines setting the connection options for this feature. Related to issue curl#8617

liamwarfield · 2022-04-14T04:48:25Z

Just pushed up a patch, addressing the last round of comments.

seanmonstar

Awesome work, this looks really good. Thank you!

Just needs a tiny change to fix the unnused mut warning, and I think we can merge.

seanmonstar · 2022-04-21T19:26:29Z

src/ffi/client.rs

@@ -94,7 +94,6 @@ ffi_fn! {
    /// Creates a new set of HTTP clientconn options to be used in a handshake.
    fn hyper_clientconn_options_new() -> *mut hyper_clientconn_options {
        let mut builder = conn::Builder::new();
-        builder.http1_preserve_header_case(true);


Looks like this removal makes a lint trigger about no longer needing to be let mut builder.

seanmonstar · 2022-04-21T19:29:53Z

This isn't a requirement, but something that I'm slightly curious about: when this cfg is enabled (but without setting the builder option), does it make a performance difference? Such as running cargo bench --bench end_to_end, or --bench pipeline? 🤷

liamwarfield · 2022-04-21T20:57:18Z

I'll look into the performance stuff when I get some time later.

seanmonstar · 2022-04-21T21:19:19Z

I'm also happy to just merge with the simple lint fix. Whatever you like :)

This cased the CI to fail

seanmonstar · 2022-04-23T16:06:07Z

Superb work, thank you thank you! ❤️

liamwarfield · 2022-04-25T17:18:16Z

The Curl Commit to enable and fix tests 580 and 581 has been merged!

curl/curl#8707

liamwarfield mentioned this pull request Apr 7, 2022

Propose the 1.0 Roadmap #2806

Merged

seanmonstar requested changes Apr 8, 2022

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liamwarfield commented Apr 11, 2022

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liamwarfield force-pushed the lwarfield/header-reordering-issue branch from 0ff3b20 to f4fec5c Compare April 11, 2022 18:23

Merge branch 'master' into lwarfield/header-reordering-issue

3154fbb

liamwarfield requested a review from seanmonstar April 11, 2022 18:33

liamwarfield mentioned this pull request Apr 14, 2022

hyper: Fixxed tests 580 and 581 for the hyper backend curl/curl#8707

Closed

seanmonstar approved these changes Apr 21, 2022

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missed a few #[cfg(feature = "ffi")]

fcc9851

This cased the CI to fail

liamwarfield force-pushed the lwarfield/header-reordering-issue branch from 9d71608 to fcc9851 Compare April 22, 2022 22:31

seanmonstar merged commit 78de891 into hyperium:master Apr 23, 2022

This was linked to issues Apr 28, 2022

Header order gets rearranged for duplicated header names #2572

Closed

Hyper Curl test 580 and 580 Root cause #2780

Closed

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fix(ffi): Change hyper_headers_foreach to iterate in recieved order #2798

fix(ffi): Change hyper_headers_foreach to iterate in recieved order #2798

liamwarfield commented Mar 30, 2022

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fix(ffi): Change hyper_headers_foreach to iterate in recieved order #2798

fix(ffi): Change hyper_headers_foreach to iterate in recieved order #2798

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