1 files changed, 88 insertions, 0 deletions
diff --git a/third_party/rust/futures-0.1.31/src/sink/send_all.rs b/third_party/rust/futures-0.1.31/src/sink/send_all.rs
new file mode 100644
index 0000000000..a230903d1c
--- /dev/null
+++ b/third_party/rust/futures-0.1.31/src/sink/send_all.rs
@@ -0,0 +1,88 @@
+use {Poll, Async, Future, AsyncSink};
+use stream::{Stream, Fuse};
+use sink::Sink;
+
+/// Future for the `Sink::send_all` combinator, which sends a stream of values
+/// to a sink and then waits until the sink has fully flushed those values.
+#[derive(Debug)]
+#[must_use = "futures do nothing unless polled"]
+pub struct SendAll<T, U: Stream> {
+    sink: Option<T>,
+    stream: Option<Fuse<U>>,
+    buffered: Option<U::Item>,
+}
+
+pub fn new<T, U>(sink: T, stream: U) -> SendAll<T, U>
+    where T: Sink,
+          U: Stream<Item = T::SinkItem>,
+          T::SinkError: From<U::Error>,
+{
+    SendAll {
+        sink: Some(sink),
+        stream: Some(stream.fuse()),
+        buffered: None,
+    }
+}
+
+impl<T, U> SendAll<T, U>
+    where T: Sink,
+          U: Stream<Item = T::SinkItem>,
+          T::SinkError: From<U::Error>,
+{
+    fn sink_mut(&mut self) -> &mut T {
+        self.sink.as_mut().take().expect("Attempted to poll SendAll after completion")
+    }
+
+    fn stream_mut(&mut self) -> &mut Fuse<U> {
+        self.stream.as_mut().take()
+            .expect("Attempted to poll SendAll after completion")
+    }
+
+    fn take_result(&mut self) -> (T, U) {
+        let sink = self.sink.take()
+            .expect("Attempted to poll Forward after completion");
+        let fuse = self.stream.take()
+            .expect("Attempted to poll Forward after completion");
+        (sink, fuse.into_inner())
+    }
+
+    fn try_start_send(&mut self, item: U::Item) -> Poll<(), T::SinkError> {
+        debug_assert!(self.buffered.is_none());
+        if let AsyncSink::NotReady(item) = self.sink_mut().start_send(item)? {
+            self.buffered = Some(item);
+            return Ok(Async::NotReady)
+        }
+        Ok(Async::Ready(()))
+    }
+}
+
+impl<T, U> Future for SendAll<T, U>
+    where T: Sink,
+          U: Stream<Item = T::SinkItem>,
+          T::SinkError: From<U::Error>,
+{
+    type Item = (T, U);
+    type Error = T::SinkError;
+
+    fn poll(&mut self) -> Poll<(T, U), T::SinkError> {
+        // If we've got an item buffered already, we need to write it to the
+        // sink before we can do anything else
+        if let Some(item) = self.buffered.take() {
+            try_ready!(self.try_start_send(item))
+        }
+
+        loop {
+            match self.stream_mut().poll()? {
+                Async::Ready(Some(item)) => try_ready!(self.try_start_send(item)),
+                Async::Ready(None) => {
+                    try_ready!(self.sink_mut().close());
+                    return Ok(Async::Ready(self.take_result()))
+                }
+                Async::NotReady => {
+                    try_ready!(self.sink_mut().poll_complete());
+                    return Ok(Async::NotReady)
+                }
+            }
+        }
+    }
+}