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//! Various codes defined in RFC 6455.
use std::{
convert::{From, Into},
fmt,
};
/// WebSocket message opcode as in RFC 6455.
#[derive(Debug, PartialEq, Eq, Clone, Copy)]
pub enum OpCode {
/// Data (text or binary).
Data(Data),
/// Control message (close, ping, pong).
Control(Control),
}
/// Data opcodes as in RFC 6455
#[derive(Debug, PartialEq, Eq, Clone, Copy)]
pub enum Data {
/// 0x0 denotes a continuation frame
Continue,
/// 0x1 denotes a text frame
Text,
/// 0x2 denotes a binary frame
Binary,
/// 0x3-7 are reserved for further non-control frames
Reserved(u8),
}
/// Control opcodes as in RFC 6455
#[derive(Debug, PartialEq, Eq, Clone, Copy)]
pub enum Control {
/// 0x8 denotes a connection close
Close,
/// 0x9 denotes a ping
Ping,
/// 0xa denotes a pong
Pong,
/// 0xb-f are reserved for further control frames
Reserved(u8),
}
impl fmt::Display for Data {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match *self {
Data::Continue => write!(f, "CONTINUE"),
Data::Text => write!(f, "TEXT"),
Data::Binary => write!(f, "BINARY"),
Data::Reserved(x) => write!(f, "RESERVED_DATA_{}", x),
}
}
}
impl fmt::Display for Control {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match *self {
Control::Close => write!(f, "CLOSE"),
Control::Ping => write!(f, "PING"),
Control::Pong => write!(f, "PONG"),
Control::Reserved(x) => write!(f, "RESERVED_CONTROL_{}", x),
}
}
}
impl fmt::Display for OpCode {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match *self {
OpCode::Data(d) => d.fmt(f),
OpCode::Control(c) => c.fmt(f),
}
}
}
impl From<OpCode> for u8 {
fn from(code: OpCode) -> Self {
use self::{
Control::{Close, Ping, Pong},
Data::{Binary, Continue, Text},
OpCode::*,
};
match code {
Data(Continue) => 0,
Data(Text) => 1,
Data(Binary) => 2,
Data(self::Data::Reserved(i)) => i,
Control(Close) => 8,
Control(Ping) => 9,
Control(Pong) => 10,
Control(self::Control::Reserved(i)) => i,
}
}
}
impl From<u8> for OpCode {
fn from(byte: u8) -> OpCode {
use self::{
Control::{Close, Ping, Pong},
Data::{Binary, Continue, Text},
OpCode::*,
};
match byte {
0 => Data(Continue),
1 => Data(Text),
2 => Data(Binary),
i @ 3..=7 => Data(self::Data::Reserved(i)),
8 => Control(Close),
9 => Control(Ping),
10 => Control(Pong),
i @ 11..=15 => Control(self::Control::Reserved(i)),
_ => panic!("Bug: OpCode out of range"),
}
}
}
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)]
Reserved(u16),
#[doc(hidden)]
Iana(u16),
#[doc(hidden)]
Library(u16),
#[doc(hidden)]
Bad(u16),
}
impl CloseCode {
/// Check if this CloseCode is allowed.
pub fn is_allowed(self) -> bool {
!matches!(self, Bad(_) | Reserved(_) | Status | Abnormal | Tls)
}
}
impl fmt::Display for CloseCode {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
let code: u16 = self.into();
write!(f, "{}", code)
}
}
impl From<CloseCode> for u16 {
fn from(code: CloseCode) -> u16 {
match code {
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,
Reserved(code) => code,
Iana(code) => code,
Library(code) => code,
Bad(code) => code,
}
}
}
impl<'t> From<&'t CloseCode> for u16 {
fn from(code: &'t CloseCode) -> u16 {
(*code).into()
}
}
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,
1..=999 => Bad(code),
1016..=2999 => Reserved(code),
3000..=3999 => Iana(code),
4000..=4999 => Library(code),
_ => Bad(code),
}
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn opcode_from_u8() {
let byte = 2u8;
assert_eq!(OpCode::from(byte), OpCode::Data(Data::Binary));
}
#[test]
fn opcode_into_u8() {
let text = OpCode::Data(Data::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);
assert_eq!(u16::from(text), 1001u16);
}
}