feat(ffi): add hyper_request_on_informational

This defines an extension type used in requests for the client that is
used to setup a callback for receipt of informational (1xx) responses.
The type isn't currently public, and is only usable in the C API.

Author: seanmonstar

capi/examples/upload.c

@@ -148,6 +148,16 @@ static int print_each_header(void *userdata,
     return HYPER_ITER_CONTINUE;
 }
 
+static void print_informational(void *userdata, hyper_response *resp) {
+    uint16_t http_status = hyper_response_status(resp);
+
+    printf("\nInformational (1xx): %d\n", http_status);
+
+    hyper_headers *headers = hyper_response_headers(resp);
+    hyper_headers_foreach(headers, print_each_header, NULL);
+    printf("\n");
+}
+
 typedef enum {
     EXAMPLE_NOT_SET = 0, // tasks we don't know about won't have a userdata set
     EXAMPLE_HANDSHAKE,
@@ -172,7 +182,7 @@ int main(int argc, char *argv[]) {
     upload.fd = open(file, O_RDONLY);
 
     if (upload.fd < 0) {
-        printf("error opening file to upload: %d", errno);
+        printf("error opening file to upload: %s\n", strerror(errno));
         return 1;
     }
     printf("connecting to port %s on %s...\n", port, host);
@@ -262,7 +272,10 @@ int main(int argc, char *argv[]) {
                 }
 
                 hyper_headers *req_headers = hyper_request_headers(req);
-                hyper_headers_set(req_headers,  STR_ARG("host"), STR_ARG(host));
+                hyper_headers_set(req_headers, STR_ARG("host"), STR_ARG(host));
+                hyper_headers_set(req_headers, STR_ARG("expect"), STR_ARG("100-continue"));
+
+                hyper_request_on_informational(req, print_informational, NULL);
 
                 // Prepare the req body
                 hyper_body *body = hyper_body_new();

capi/include/hyper.h

@@ -207,6 +207,8 @@ typedef int (*hyper_body_foreach_callback)(void*, const struct hyper_buf*);
 
 typedef int (*hyper_body_data_callback)(void*, struct hyper_context*, struct hyper_buf**);
 
+typedef void (*hyper_request_on_informational_callback)(void*, const struct hyper_response*);
+
 typedef int (*hyper_headers_foreach_callback)(void*, const uint8_t*, size_t, const uint8_t*, size_t);
 
 typedef size_t (*hyper_io_read_callback)(void*, struct hyper_context*, uint8_t*, size_t);
@@ -454,6 +456,27 @@ struct hyper_headers *hyper_request_headers(struct hyper_request *req);
  */
 enum hyper_code hyper_request_set_body(struct hyper_request *req, struct hyper_body *body);
 
+/*
+ Set an informational (1xx) response callback.
+
+ The callback is called each time hyper receives an informational (1xx)
+ response for this request.
+
+ The third argument is an opaque user data pointer, which is passed to
+ the callback each time.
+
+ The callback is passed the `void *` data pointer, and a
+ `hyper_response *` which can be inspected as any other response. The
+ body of the response will always be empty.
+
+ NOTE: The `const hyper_response *` is just borrowed data, and will not
+ be valid after the callback finishes. You must copy any data you wish
+ to persist.
+ */
+enum hyper_code hyper_request_on_informational(struct hyper_request *req,
+                                               hyper_request_on_informational_callback callback,
+                                               void *data);
+
 /*
  Free an HTTP response after using it.
  */

src/ffi/http_types.rs

@@ -5,7 +5,7 @@ use std::ffi::c_void;
 use super::body::{hyper_body, hyper_buf};
 use super::error::hyper_code;
 use super::task::{hyper_task_return_type, AsTaskType};
-use super::HYPER_ITER_CONTINUE;
+use super::{UserDataPointer, HYPER_ITER_CONTINUE};
 use crate::ext::HeaderCaseMap;
 use crate::header::{HeaderName, HeaderValue};
 use crate::{Body, HeaderMap, Method, Request, Response, Uri};
@@ -29,6 +29,13 @@ pub(crate) struct ReasonPhrase(pub(crate) Bytes);
 
 pub(crate) struct RawHeaders(pub(crate) hyper_buf);
 
+pub(crate) struct OnInformational {
+    func: hyper_request_on_informational_callback,
+    data: UserDataPointer,
+}
+
+type hyper_request_on_informational_callback = extern "C" fn(*mut c_void, *const hyper_response);
+
 // ===== impl hyper_request =====
 
 ffi_fn! {
@@ -129,6 +136,32 @@ ffi_fn! {
     }
 }
 
+ffi_fn! {
+    /// Set an informational (1xx) response callback.
+    ///
+    /// The callback is called each time hyper receives an informational (1xx)
+    /// response for this request.
+    ///
+    /// The third argument is an opaque user data pointer, which is passed to
+    /// the callback each time.
+    ///
+    /// The callback is passed the `void *` data pointer, and a
+    /// `hyper_response *` which can be inspected as any other response. The
+    /// body of the response will always be empty.
+    ///
+    /// NOTE: The `const hyper_response *` is just borrowed data, and will not
+    /// be valid after the callback finishes. You must copy any data you wish
+    /// to persist.
+    fn hyper_request_on_informational(req: *mut hyper_request, callback: hyper_request_on_informational_callback, data: *mut c_void) -> hyper_code {
+        let ext = OnInformational {
+            func: callback,
+            data: UserDataPointer(data),
+        };
+        unsafe { &mut *req }.0.extensions_mut().insert(ext);
+        hyper_code::HYPERE_OK
+    }
+}
+
 impl hyper_request {
     pub(super) fn finalize_request(&mut self) {
         if let Some(headers) = self.0.extensions_mut().remove::<hyper_headers>() {
@@ -394,6 +427,15 @@ unsafe fn raw_name_value(
     Ok((name, value, orig_name))
 }
 
+// ===== impl OnInformational =====
+
+impl OnInformational {
+    pub(crate) fn call(&mut self, resp: Response<Body>) {
+        let mut resp = hyper_response(resp);
+        (self.func)(self.data.0, &mut resp);
+    }
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;

src/ffi/mod.rs

@@ -81,6 +81,7 @@ struct UserDataPointer(*mut std::ffi::c_void);
 // We don't actually know anything about this pointer, it's up to the user
 // to do the right thing.
 unsafe impl Send for UserDataPointer {}
+unsafe impl Sync for UserDataPointer {}
 
 /// cbindgen:ignore
 static VERSION_CSTR: &str = concat!(env!("CARGO_PKG_VERSION"), "\0");

src/proto/h1/conn.rs

@@ -50,6 +50,8 @@ where
                 title_case_headers: false,
                 h09_responses: false,
                 #[cfg(feature = "ffi")]
+                on_informational: None,
+                #[cfg(feature = "ffi")]
                 raw_headers: false,
                 notify_read: false,
                 reading: Reading::Init,
@@ -170,6 +172,8 @@ where
                 preserve_header_case: self.state.preserve_header_case,
                 h09_responses: self.state.h09_responses,
                 #[cfg(feature = "ffi")]
+                on_informational: &mut self.state.on_informational,
+                #[cfg(feature = "ffi")]
                 raw_headers: self.state.raw_headers,
             }
         )) {
@@ -185,6 +189,12 @@ where
         // Prevent accepting HTTP/0.9 responses after the initial one, if any.
         self.state.h09_responses = false;
 
+        // Drop any OnInformational callbacks, we're done there!
+        #[cfg(feature = "ffi")]
+        {
+            self.state.on_informational = None;
+        }
+
         self.state.busy();
         self.state.keep_alive &= msg.keep_alive;
         self.state.version = msg.head.version;
@@ -525,6 +535,14 @@ where
                 debug_assert!(self.state.cached_headers.is_none());
                 debug_assert!(head.headers.is_empty());
                 self.state.cached_headers = Some(head.headers);
+
+                #[cfg(feature = "ffi")]
+                {
+                    self.state.on_informational = head
+                        .extensions
+                        .remove::<crate::ffi::OnInformational>();
+                }
+
                 Some(encoder)
             }
             Err(err) => {
@@ -775,6 +793,11 @@ struct State {
     preserve_header_case: bool,
     title_case_headers: bool,
     h09_responses: bool,
+    /// If set, called with each 1xx informational response received for
+    /// the current request. MUST be unset after a non-1xx response is
+    /// received.
+    #[cfg(feature = "ffi")]
+    on_informational: Option<crate::ffi::OnInformational>,
     #[cfg(feature = "ffi")]
     raw_headers: bool,
     /// Set to true when the Dispatcher should poll read operations

src/proto/h1/dispatch.rs

@@ -598,11 +598,7 @@ cfg_client! {
             match msg {
                 Ok((msg, body)) => {
                     if let Some(cb) = self.callback.take() {
-                        let mut res = http::Response::new(body);
-                        *res.status_mut() = msg.subject;
-                        *res.headers_mut() = msg.headers;
-                        *res.version_mut() = msg.version;
-                        *res.extensions_mut() = msg.extensions;
+                        let res = msg.into_response(body);
                         cb.send(Ok(res));
                         Ok(())
                     } else {

src/proto/h1/io.rs

@@ -168,6 +168,8 @@ where
                     preserve_header_case: parse_ctx.preserve_header_case,
                     h09_responses: parse_ctx.h09_responses,
                     #[cfg(feature = "ffi")]
+                    on_informational: parse_ctx.on_informational,
+                    #[cfg(feature = "ffi")]
                     raw_headers: parse_ctx.raw_headers,
                 },
             )? {
@@ -678,6 +680,8 @@ mod tests {
                 preserve_header_case: false,
                 h09_responses: false,
                 #[cfg(feature = "ffi")]
+                on_informational: &mut None,
+                #[cfg(feature = "ffi")]
                 raw_headers: false,
             };
             assert!(buffered

src/proto/h1/mod.rs

@@ -75,6 +75,8 @@ pub(crate) struct ParseContext<'a> {
     preserve_header_case: bool,
     h09_responses: bool,
     #[cfg(feature = "ffi")]
+    on_informational: &'a mut Option<crate::ffi::OnInformational>,
+    #[cfg(feature = "ffi")]
     raw_headers: bool,
 }