1 files changed, 134 insertions, 0 deletions
diff --git a/third_party/rust/h2/src/frame/reason.rs b/third_party/rust/h2/src/frame/reason.rs
new file mode 100644
index 0000000000..ff5e2012f8
--- /dev/null
+++ b/third_party/rust/h2/src/frame/reason.rs
@@ -0,0 +1,134 @@
+use std::fmt;
+
+/// HTTP/2 error codes.
+///
+/// Error codes are used in `RST_STREAM` and `GOAWAY` frames to convey the
+/// reasons for the stream or connection error. For example,
+/// [`SendStream::send_reset`] takes a `Reason` argument. Also, the `Error` type
+/// may contain a `Reason`.
+///
+/// Error codes share a common code space. Some error codes apply only to
+/// streams, others apply only to connections, and others may apply to either.
+/// See [RFC 7540] for more information.
+///
+/// See [Error Codes in the spec][spec].
+///
+/// [spec]: http://httpwg.org/specs/rfc7540.html#ErrorCodes
+/// [`SendStream::send_reset`]: struct.SendStream.html#method.send_reset
+#[derive(PartialEq, Eq, Clone, Copy)]
+pub struct Reason(u32);
+
+impl Reason {
+    /// The associated condition is not a result of an error.
+    ///
+    /// For example, a GOAWAY might include this code to indicate graceful
+    /// shutdown of a connection.
+    pub const NO_ERROR: Reason = Reason(0);
+    /// The endpoint detected an unspecific protocol error.
+    ///
+    /// This error is for use when a more specific error code is not available.
+    pub const PROTOCOL_ERROR: Reason = Reason(1);
+    /// The endpoint encountered an unexpected internal error.
+    pub const INTERNAL_ERROR: Reason = Reason(2);
+    /// The endpoint detected that its peer violated the flow-control protocol.
+    pub const FLOW_CONTROL_ERROR: Reason = Reason(3);
+    /// The endpoint sent a SETTINGS frame but did not receive a response in
+    /// a timely manner.
+    pub const SETTINGS_TIMEOUT: Reason = Reason(4);
+    /// The endpoint received a frame after a stream was half-closed.
+    pub const STREAM_CLOSED: Reason = Reason(5);
+    /// The endpoint received a frame with an invalid size.
+    pub const FRAME_SIZE_ERROR: Reason = Reason(6);
+    /// The endpoint refused the stream prior to performing any application
+    /// processing.
+    pub const REFUSED_STREAM: Reason = Reason(7);
+    /// Used by the endpoint to indicate that the stream is no longer needed.
+    pub const CANCEL: Reason = Reason(8);
+    /// The endpoint is unable to maintain the header compression context for
+    /// the connection.
+    pub const COMPRESSION_ERROR: Reason = Reason(9);
+    /// The connection established in response to a CONNECT request was reset
+    /// or abnormally closed.
+    pub const CONNECT_ERROR: Reason = Reason(10);
+    /// The endpoint detected that its peer is exhibiting a behavior that might
+    /// be generating excessive load.
+    pub const ENHANCE_YOUR_CALM: Reason = Reason(11);
+    /// The underlying transport has properties that do not meet minimum
+    /// security requirements.
+    pub const INADEQUATE_SECURITY: Reason = Reason(12);
+    /// The endpoint requires that HTTP/1.1 be used instead of HTTP/2.
+    pub const HTTP_1_1_REQUIRED: Reason = Reason(13);
+
+    /// Get a string description of the error code.
+    pub fn description(&self) -> &str {
+        match self.0 {
+            0 => "not a result of an error",
+            1 => "unspecific protocol error detected",
+            2 => "unexpected internal error encountered",
+            3 => "flow-control protocol violated",
+            4 => "settings ACK not received in timely manner",
+            5 => "received frame when stream half-closed",
+            6 => "frame with invalid size",
+            7 => "refused stream before processing any application logic",
+            8 => "stream no longer needed",
+            9 => "unable to maintain the header compression context",
+            10 => {
+                "connection established in response to a CONNECT request was reset or abnormally \
+                 closed"
+            }
+            11 => "detected excessive load generating behavior",
+            12 => "security properties do not meet minimum requirements",
+            13 => "endpoint requires HTTP/1.1",
+            _ => "unknown reason",
+        }
+    }
+}
+
+impl From<u32> for Reason {
+    fn from(src: u32) -> Reason {
+        Reason(src)
+    }
+}
+
+impl From<Reason> for u32 {
+    fn from(src: Reason) -> u32 {
+        src.0
+    }
+}
+
+impl fmt::Debug for Reason {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        let name = match self.0 {
+            0 => "NO_ERROR",
+            1 => "PROTOCOL_ERROR",
+            2 => "INTERNAL_ERROR",
+            3 => "FLOW_CONTROL_ERROR",
+            4 => "SETTINGS_TIMEOUT",
+            5 => "STREAM_CLOSED",
+            6 => "FRAME_SIZE_ERROR",
+            7 => "REFUSED_STREAM",
+            8 => "CANCEL",
+            9 => "COMPRESSION_ERROR",
+            10 => "CONNECT_ERROR",
+            11 => "ENHANCE_YOUR_CALM",
+            12 => "INADEQUATE_SECURITY",
+            13 => "HTTP_1_1_REQUIRED",
+            other => return f.debug_tuple("Reason").field(&Hex(other)).finish(),
+        };
+        f.write_str(name)
+    }
+}
+
+struct Hex(u32);
+
+impl fmt::Debug for Hex {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        fmt::LowerHex::fmt(&self.0, f)
+    }
+}
+
+impl fmt::Display for Reason {
+    fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
+        write!(fmt, "{}", self.description())
+    }
+}