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use serde_repr::{Deserialize_repr, Serialize_repr};
/// Gateway event's payload type.
#[derive(Clone, Copy, Debug, Deserialize_repr, Eq, Hash, PartialEq, Serialize_repr)]
#[non_exhaustive]
#[repr(u8)]
pub enum OpCode {
/// [`DispatchEvent`] and sequence number.
///
/// Will only be received when connected to the gateway with an active
/// session.
///
/// [`DispatchEvent`]: super::event::DispatchEvent
Dispatch = 0,
/// Periodically sent to maintain the gateway connection and may be received
/// to immediately request one.
Heartbeat = 1,
/// Start a new session.
Identify = 2,
/// Request to update the client's presence.
PresenceUpdate = 3,
/// Request to join, leave or move between voice channels.
VoiceStateUpdate = 4,
/// Resume a previously disconnected session, skipping over [`Identify`].
///
/// [`Identify`]: Self::Identify
Resume = 6,
/// Indicates that a reconnect is required.
Reconnect = 7,
/// Request a list of members for a guild.
RequestGuildMembers = 8,
/// Received when the session is invalidated.
InvalidSession = 9,
/// Received after connecting, contains the heartbeat interval.
Hello = 10,
/// Received in response to sending a [`Heartbeat`].
///
/// [`Heartbeat`]: Self::Heartbeat
HeartbeatAck = 11,
}
impl OpCode {
/// Try to match an integer value to an opcode, returning [`None`] if no
/// match is found.
pub const fn from(code: u8) -> Option<Self> {
Some(match code {
0 => Self::Dispatch,
1 => Self::Heartbeat,
2 => Self::Identify,
3 => Self::PresenceUpdate,
4 => Self::VoiceStateUpdate,
6 => Self::Resume,
7 => Self::Reconnect,
8 => Self::RequestGuildMembers,
9 => Self::InvalidSession,
10 => Self::Hello,
11 => Self::HeartbeatAck,
_ => return None,
})
}
/// Whether the opcode is received by the client.
///
/// This includes the following opcodes:
///
/// - [`Dispatch`]
/// - [`Heartbeat`]
/// - [`HeartbeatAck`]
/// - [`Hello`]
/// - [`InvalidSession`]
/// - [`Reconnect`]
///
/// [`Dispatch`]: Self::Dispatch
/// [`Heartbeat`]: Self::Heartbeat
/// [`HeartbeatAck`]: Self::HeartbeatAck
/// [`Hello`]: Self::Hello
/// [`InvalidSession`]: Self::InvalidSession
/// [`Reconnect`]: Self::Reconnect
pub const fn is_received(self) -> bool {
matches!(
self,
Self::Dispatch
| Self::Heartbeat
| Self::HeartbeatAck
| Self::Hello
| Self::InvalidSession
| Self::Reconnect
)
}
/// Whether the opcode is sent by the client.
///
/// This includes the following opcodes:
///
/// - [`Heartbeat`]
/// - [`Identify`]
/// - [`PresenceUpdate`]
/// - [`Resume`]
/// - [`RequestGuildMembers`]
/// - [`VoiceStateUpdate`]
///
/// [`Heartbeat`]: Self::Heartbeat
/// [`Identify`]: Self::Identify
/// [`PresenceUpdate`]: Self::PresenceUpdate
/// [`Resume`]: Self::Resume
/// [`RequestGuildMembers`]: Self::RequestGuildMembers
/// [`VoiceStateUpdate`]: Self::VoiceStateUpdate
pub const fn is_sent(self) -> bool {
matches!(
self,
Self::Heartbeat
| Self::Identify
| Self::PresenceUpdate
| Self::Resume
| Self::RequestGuildMembers
| Self::VoiceStateUpdate
)
}
}
#[cfg(test)]
mod tests {
use super::OpCode;
use serde::{Deserialize, Serialize};
use serde_test::Token;
use static_assertions::assert_impl_all;
use std::fmt::Debug;
assert_impl_all!(
OpCode: Clone,
Copy,
Debug,
Deserialize<'static>,
Eq,
PartialEq,
Send,
Serialize,
Sync,
);
const MAP: &[(OpCode, u8, bool, bool)] = &[
(OpCode::Dispatch, 0, true, false),
(OpCode::Heartbeat, 1, true, true),
(OpCode::Identify, 2, false, true),
(OpCode::PresenceUpdate, 3, false, true),
(OpCode::VoiceStateUpdate, 4, false, true),
(OpCode::Resume, 6, false, true),
(OpCode::Reconnect, 7, true, false),
(OpCode::RequestGuildMembers, 8, false, true),
(OpCode::InvalidSession, 9, true, false),
(OpCode::Hello, 10, true, false),
(OpCode::HeartbeatAck, 11, true, false),
];
#[test]
fn variants() {
for (value, integer, received, sent) in MAP {
serde_test::assert_tokens(value, &[Token::U8(*integer)]);
assert_eq!(value.is_received(), *received);
assert_eq!(value.is_sent(), *sent);
}
}
}