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|
use std::collections::BTreeMap;
use crate::{
clock::DateTime,
repo::{
channel::{self, Channel},
login::Login,
message,
},
};
#[derive(
Debug,
Eq,
Ord,
PartialEq,
PartialOrd,
Clone,
Copy,
serde::Serialize,
serde::Deserialize,
sqlx::Type,
)]
#[serde(transparent)]
#[sqlx(transparent)]
pub struct Sequence(i64);
impl Sequence {
pub fn next(self) -> Self {
let Self(current) = self;
Self(current + 1)
}
}
// For the purposes of event replay, an "event ID" is a vector of per-channel
// sequence numbers. Replay will start with messages whose sequence number in
// its channel is higher than the sequence in the event ID, or if the channel
// is not listed in the event ID, then at the beginning.
//
// Using a sorted map ensures that there is a canonical representation for
// each event ID.
#[derive(Clone, Debug, Default, PartialEq, PartialOrd, serde::Deserialize, serde::Serialize)]
#[serde(transparent)]
pub struct ResumePoint(BTreeMap<channel::Id, Sequence>);
impl ResumePoint {
pub fn singleton(channel: &channel::Id, sequence: Sequence) -> Self {
let mut vector = Self::default();
vector.advance(channel, sequence);
vector
}
pub fn advance(&mut self, channel: &channel::Id, sequence: Sequence) {
let Self(elements) = self;
elements.insert(channel.clone(), sequence);
}
pub fn get(&self, channel: &channel::Id) -> Option<Sequence> {
let Self(elements) = self;
elements.get(channel).copied()
}
}
#[derive(Clone, Debug)]
pub struct ResumableEvent(pub ResumePoint, pub ChannelEvent);
#[derive(Clone, Debug, Eq, PartialEq, serde::Serialize)]
pub struct ChannelEvent {
#[serde(skip)]
pub sequence: Sequence,
pub at: DateTime,
pub channel: Channel,
#[serde(flatten)]
pub data: ChannelEventData,
}
impl ChannelEvent {
pub fn sequence(&self) -> ResumePoint {
ResumePoint::singleton(&self.channel.id, self.sequence)
}
}
#[derive(Clone, Debug, Eq, PartialEq, serde::Serialize)]
#[serde(tag = "type", rename_all = "snake_case")]
pub enum ChannelEventData {
Message(MessageEvent),
}
#[derive(Clone, Debug, Eq, PartialEq, serde::Serialize)]
pub struct MessageEvent {
pub id: message::Id,
pub sender: Login,
pub body: String,
}
impl From<MessageEvent> for ChannelEventData {
fn from(message: MessageEvent) -> Self {
Self::Message(message)
}
}
|
