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use std::ffi::c_void;
use std::mem::ManuallyDrop;
use std::ptr;
use std::task::{Context, Poll};
use http::HeaderMap;
use libc::{c_int, size_t};
use super::task::{hyper_context, hyper_task, hyper_task_return_type, AsTaskType};
use super::{UserDataPointer, HYPER_ITER_CONTINUE};
use crate::body::{Body, Bytes, HttpBody as _};
/// A streaming HTTP body.
pub struct hyper_body(pub(super) Body);
/// A buffer of bytes that is sent or received on a `hyper_body`.
pub struct hyper_buf(pub(crate) Bytes);
pub(crate) struct UserBody {
data_func: hyper_body_data_callback,
userdata: *mut c_void,
}
// ===== Body =====
type hyper_body_foreach_callback = extern "C" fn(*mut c_void, *const hyper_buf) -> c_int;
type hyper_body_data_callback =
extern "C" fn(*mut c_void, *mut hyper_context<'_>, *mut *mut hyper_buf) -> c_int;
ffi_fn! {
/// Create a new "empty" body.
///
/// If not configured, this body acts as an empty payload.
fn hyper_body_new() -> *mut hyper_body {
Box::into_raw(Box::new(hyper_body(Body::empty())))
} ?= ptr::null_mut()
}
ffi_fn! {
/// Free a `hyper_body *`.
fn hyper_body_free(body: *mut hyper_body) {
drop(non_null!(Box::from_raw(body) ?= ()));
}
}
ffi_fn! {
/// Return a task that will poll the body for the next buffer of data.
///
/// The task value may have different types depending on the outcome:
///
/// - `HYPER_TASK_BUF`: Success, and more data was received.
/// - `HYPER_TASK_ERROR`: An error retrieving the data.
/// - `HYPER_TASK_EMPTY`: The body has finished streaming data.
///
/// This does not consume the `hyper_body *`, so it may be used to again.
/// However, it MUST NOT be used or freed until the related task completes.
fn hyper_body_data(body: *mut hyper_body) -> *mut hyper_task {
// This doesn't take ownership of the Body, so don't allow destructor
let mut body = ManuallyDrop::new(non_null!(Box::from_raw(body) ?= ptr::null_mut()));
Box::into_raw(hyper_task::boxed(async move {
body.0.data().await.map(|res| res.map(hyper_buf))
}))
} ?= ptr::null_mut()
}
ffi_fn! {
/// Return a task that will poll the body and execute the callback with each
/// body chunk that is received.
///
/// The `hyper_buf` pointer is only a borrowed reference, it cannot live outside
/// the execution of the callback. You must make a copy to retain it.
///
/// The callback should return `HYPER_ITER_CONTINUE` to continue iterating
/// chunks as they are received, or `HYPER_ITER_BREAK` to cancel.
///
/// This will consume the `hyper_body *`, you shouldn't use it anymore or free it.
fn hyper_body_foreach(body: *mut hyper_body, func: hyper_body_foreach_callback, userdata: *mut c_void) -> *mut hyper_task {
let mut body = non_null!(Box::from_raw(body) ?= ptr::null_mut());
let userdata = UserDataPointer(userdata);
Box::into_raw(hyper_task::boxed(async move {
while let Some(item) = body.0.data().await {
let chunk = item?;
if HYPER_ITER_CONTINUE != func(userdata.0, &hyper_buf(chunk)) {
return Err(crate::Error::new_user_aborted_by_callback());
}
}
Ok(())
}))
} ?= ptr::null_mut()
}
ffi_fn! {
/// Set userdata on this body, which will be passed to callback functions.
fn hyper_body_set_userdata(body: *mut hyper_body, userdata: *mut c_void) {
let b = non_null!(&mut *body ?= ());
b.0.as_ffi_mut().userdata = userdata;
}
}
ffi_fn! {
/// Set the data callback for this body.
///
/// The callback is called each time hyper needs to send more data for the
/// body. It is passed the value from `hyper_body_set_userdata`.
///
/// If there is data available, the `hyper_buf **` argument should be set
/// to a `hyper_buf *` containing the data, and `HYPER_POLL_READY` should
/// be returned.
///
/// Returning `HYPER_POLL_READY` while the `hyper_buf **` argument points
/// to `NULL` will indicate the body has completed all data.
///
/// If there is more data to send, but it isn't yet available, a
/// `hyper_waker` should be saved from the `hyper_context *` argument, and
/// `HYPER_POLL_PENDING` should be returned. You must wake the saved waker
/// to signal the task when data is available.
///
/// If some error has occurred, you can return `HYPER_POLL_ERROR` to abort
/// the body.
fn hyper_body_set_data_func(body: *mut hyper_body, func: hyper_body_data_callback) {
let b = non_null!{ &mut *body ?= () };
b.0.as_ffi_mut().data_func = func;
}
}
// ===== impl UserBody =====
impl UserBody {
pub(crate) fn new() -> UserBody {
UserBody {
data_func: data_noop,
userdata: std::ptr::null_mut(),
}
}
pub(crate) fn poll_data(&mut self, cx: &mut Context<'_>) -> Poll<Option<crate::Result<Bytes>>> {
let mut out = std::ptr::null_mut();
match (self.data_func)(self.userdata, hyper_context::wrap(cx), &mut out) {
super::task::HYPER_POLL_READY => {
if out.is_null() {
Poll::Ready(None)
} else {
let buf = unsafe { Box::from_raw(out) };
Poll::Ready(Some(Ok(buf.0)))
}
}
super::task::HYPER_POLL_PENDING => Poll::Pending,
super::task::HYPER_POLL_ERROR => {
Poll::Ready(Some(Err(crate::Error::new_body_write_aborted())))
}
unexpected => Poll::Ready(Some(Err(crate::Error::new_body_write(format!(
"unexpected hyper_body_data_func return code {}",
unexpected
))))),
}
}
pub(crate) fn poll_trailers(
&mut self,
_cx: &mut Context<'_>,
) -> Poll<crate::Result<Option<HeaderMap>>> {
Poll::Ready(Ok(None))
}
}
/// cbindgen:ignore
extern "C" fn data_noop(
_userdata: *mut c_void,
_: *mut hyper_context<'_>,
_: *mut *mut hyper_buf,
) -> c_int {
super::task::HYPER_POLL_READY
}
unsafe impl Send for UserBody {}
unsafe impl Sync for UserBody {}
// ===== Bytes =====
ffi_fn! {
/// Create a new `hyper_buf *` by copying the provided bytes.
///
/// This makes an owned copy of the bytes, so the `buf` argument can be
/// freed or changed afterwards.
///
/// This returns `NULL` if allocating a new buffer fails.
fn hyper_buf_copy(buf: *const u8, len: size_t) -> *mut hyper_buf {
let slice = unsafe {
std::slice::from_raw_parts(buf, len)
};
Box::into_raw(Box::new(hyper_buf(Bytes::copy_from_slice(slice))))
} ?= ptr::null_mut()
}
ffi_fn! {
/// Get a pointer to the bytes in this buffer.
///
/// This should be used in conjunction with `hyper_buf_len` to get the length
/// of the bytes data.
///
/// This pointer is borrowed data, and not valid once the `hyper_buf` is
/// consumed/freed.
fn hyper_buf_bytes(buf: *const hyper_buf) -> *const u8 {
unsafe { (*buf).0.as_ptr() }
} ?= ptr::null()
}
ffi_fn! {
/// Get the length of the bytes this buffer contains.
fn hyper_buf_len(buf: *const hyper_buf) -> size_t {
unsafe { (*buf).0.len() }
}
}
ffi_fn! {
/// Free this buffer.
fn hyper_buf_free(buf: *mut hyper_buf) {
drop(unsafe { Box::from_raw(buf) });
}
}
unsafe impl AsTaskType for hyper_buf {
fn as_task_type(&self) -> hyper_task_return_type {
hyper_task_return_type::HYPER_TASK_BUF
}
}