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use std::convert::{From, Into};
use std::fmt;
use self::OpCode::*;
/// Operation codes as part of rfc6455.
#[derive(Debug, Eq, PartialEq, Clone, Copy)]
pub enum OpCode {
/// Indicates a continuation frame of a fragmented message.
Continue,
/// Indicates a text data frame.
Text,
/// Indicates a binary data frame.
Binary,
/// Indicates a close control frame.
Close,
/// Indicates a ping control frame.
Ping,
/// Indicates a pong control frame.
Pong,
/// Indicates an invalid opcode was received.
Bad,
}
impl OpCode {
/// Test whether the opcode indicates a control frame.
pub fn is_control(&self) -> bool {
match *self {
Text | Binary | Continue => false,
_ => true,
}
}
}
impl fmt::Display for OpCode {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match *self {
Continue => write!(f, "CONTINUE"),
Text => write!(f, "TEXT"),
Binary => write!(f, "BINARY"),
Close => write!(f, "CLOSE"),
Ping => write!(f, "PING"),
Pong => write!(f, "PONG"),
Bad => write!(f, "BAD"),
}
}
}
impl Into<u8> for OpCode {
fn into(self) -> u8 {
match self {
Continue => 0,
Text => 1,
Binary => 2,
Close => 8,
Ping => 9,
Pong => 10,
Bad => {
debug_assert!(
false,
"Attempted to convert invalid opcode to u8. This is a bug."
);
8 // if this somehow happens, a close frame will help us tear down quickly
}
}
}
}
impl From<u8> for OpCode {
fn from(byte: u8) -> OpCode {
match byte {
0 => Continue,
1 => Text,
2 => Binary,
8 => Close,
9 => Ping,
10 => Pong,
_ => Bad,
}
}
}
use self::CloseCode::*;
/// Status code used to indicate why an endpoint is closing the WebSocket connection.
#[derive(Debug, Eq, PartialEq, Clone, Copy)]
pub enum CloseCode {
/// Indicates a normal closure, meaning that the purpose for
/// which the connection was established has been fulfilled.
Normal,
/// Indicates that an endpoint is "going away", such as a server
/// going down or a browser having navigated away from a page.
Away,
/// Indicates that an endpoint is terminating the connection due
/// to a protocol error.
Protocol,
/// Indicates that an endpoint is terminating the connection
/// because it has received a type of data it cannot accept (e.g., an
/// endpoint that understands only text data MAY send this if it
/// receives a binary message).
Unsupported,
/// Indicates that no status code was included in a closing frame. This
/// close code makes it possible to use a single method, `on_close` to
/// handle even cases where no close code was provided.
Status,
/// Indicates an abnormal closure. If the abnormal closure was due to an
/// error, this close code will not be used. Instead, the `on_error` method
/// of the handler will be called with the error. However, if the connection
/// is simply dropped, without an error, this close code will be sent to the
/// handler.
Abnormal,
/// Indicates that an endpoint is terminating the connection
/// because it has received data within a message that was not
/// consistent with the type of the message (e.g., non-UTF-8 [RFC3629]
/// data within a text message).
Invalid,
/// Indicates that an endpoint is terminating the connection
/// because it has received a message that violates its policy. This
/// is a generic status code that can be returned when there is no
/// other more suitable status code (e.g., Unsupported or Size) or if there
/// is a need to hide specific details about the policy.
Policy,
/// Indicates that an endpoint is terminating the connection
/// because it has received a message that is too big for it to
/// process.
Size,
/// Indicates that an endpoint (client) is terminating the
/// connection because it has expected the server to negotiate one or
/// more extension, but the server didn't return them in the response
/// message of the WebSocket handshake. The list of extensions that
/// are needed should be given as the reason for closing.
/// Note that this status code is not used by the server, because it
/// can fail the WebSocket handshake instead.
Extension,
/// Indicates that a server is terminating the connection because
/// it encountered an unexpected condition that prevented it from
/// fulfilling the request.
Error,
/// Indicates that the server is restarting. A client may choose to reconnect,
/// and if it does, it should use a randomized delay of 5-30 seconds between attempts.
Restart,
/// Indicates that the server is overloaded and the client should either connect
/// to a different IP (when multiple targets exist), or reconnect to the same IP
/// when a user has performed an action.
Again,
#[doc(hidden)]
Tls,
#[doc(hidden)]
Empty,
#[doc(hidden)]
Other(u16),
}
impl Into<u16> for CloseCode {
fn into(self) -> u16 {
match self {
Normal => 1000,
Away => 1001,
Protocol => 1002,
Unsupported => 1003,
Status => 1005,
Abnormal => 1006,
Invalid => 1007,
Policy => 1008,
Size => 1009,
Extension => 1010,
Error => 1011,
Restart => 1012,
Again => 1013,
Tls => 1015,
Empty => 0,
Other(code) => code,
}
}
}
impl From<u16> for CloseCode {
fn from(code: u16) -> CloseCode {
match code {
1000 => Normal,
1001 => Away,
1002 => Protocol,
1003 => Unsupported,
1005 => Status,
1006 => Abnormal,
1007 => Invalid,
1008 => Policy,
1009 => Size,
1010 => Extension,
1011 => Error,
1012 => Restart,
1013 => Again,
1015 => Tls,
0 => Empty,
_ => Other(code),
}
}
}
mod test {
#![allow(unused_imports, unused_variables, dead_code)]
use super::*;
#[test]
fn opcode_from_u8() {
let byte = 2u8;
assert_eq!(OpCode::from(byte), OpCode::Binary);
}
#[test]
fn opcode_into_u8() {
let text = OpCode::Text;
let byte: u8 = text.into();
assert_eq!(byte, 1u8);
}
#[test]
fn closecode_from_u16() {
let byte = 1008u16;
assert_eq!(CloseCode::from(byte), CloseCode::Policy);
}
#[test]
fn closecode_into_u16() {
let text = CloseCode::Away;
let byte: u16 = text.into();
assert_eq!(byte, 1001u16);
}
}