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use async_trait::async_trait;
use protocol::bridge_engine::{self, GameState, Player};
use serde_json::json;
use sqlx::{query, PgPool};
use uuid::Uuid;
use crate::error::BridgeError;
#[async_trait]
pub trait Journal {
// Next sequence number to use.
fn next(&self) -> i64;
// Append payload to the journal at sequence number `seq`.
async fn append(&mut self, seq: i64, payload: serde_json::Value) -> Result<(), BridgeError>;
// Fetch all journal entries with sequence number greater or equal to `seq`.
async fn replay(&mut self, seq: i64) -> Result<Vec<serde_json::Value>, BridgeError>;
}
pub struct DbJournal {
db: PgPool,
id: Uuid,
seq: i64
}
impl DbJournal {
pub fn new(db: PgPool, id: Uuid) -> Self {
Self { db, id, seq: -1 }
}
}
#[async_trait]
impl Journal for DbJournal {
async fn append(&mut self, seq: i64, payload: serde_json::Value) -> Result<(), BridgeError> {
query!(
r#"
insert into object_journal (id, seq, payload)
values ($1, $2, $3)
"#,
self.id,
seq,
payload,
)
.execute(&self.db)
.await?;
Ok(())
}
async fn replay(&mut self, seq: i64) -> Result<Vec<serde_json::Value>, BridgeError> {
let results = query!(
r#"
select payload from object_journal
where id = $1 and seq >= $2
order by seq
"#,
self.id,
seq
)
.fetch_all(&self.db)
.await?;
Ok(results.into_iter().map(|v| v.payload).collect())
}
fn next(&self) -> i64 {
self.seq + 1
}
}
pub struct Table<J>
where
J: Journal,
{
journal: J,
game: GameState,
}
impl<J: Journal> Table<J> {
pub fn game(&self) -> &GameState { &self.game }
}
impl<J: Journal> Table<J> {
pub async fn new(mut journal: J) -> Result<Self, BridgeError> {
let game = GameState::Bidding {
dealer: Player::East,
deal: bridge_engine::deal(),
};
journal.append(0, json!(game)).await?;
Ok(Table { journal, game })
}
pub async fn replay(mut journal: J) -> Result<Self, BridgeError> {
let games = journal.replay(0).await?;
if games.is_empty() {
return Err(BridgeError::NotFound("table journal missing".to_string()));
}
let game = serde_json::from_value(games[games.len() - 1].clone())?;
Ok(Table { journal, game } )
}
pub async fn new_or_replay(mut journal: J) -> Result<Self, BridgeError> {
let games = journal.replay(0).await?;
if games.is_empty() {
return Self::new(journal).await;
}
let game = serde_json::from_value(games[games.len() - 1].clone())?;
Ok(Table { journal, game } )
}
}
#[cfg(test)]
mod test {
use super::*;
#[derive(Default)]
pub struct TestJournal {
log: Vec<Option<serde_json::Value>>,
}
#[async_trait]
impl Journal for TestJournal {
async fn append(
&mut self,
seq: i64,
payload: serde_json::Value,
) -> Result<(), BridgeError> {
if seq != self.log.len() as i64 {
return Err(BridgeError::UpdateConflict(self.log.len() as i64, seq));
}
self.log.push(Some(payload));
Ok(())
}
async fn replay(&mut self, seq: i64) -> Result<Vec<serde_json::Value>, BridgeError> {
Ok(self.log[seq as usize..]
.into_iter()
.filter_map(|e| e.clone())
.collect())
}
fn next(&self) -> i64 {
self.log.len() as i64
}
}
#[tokio::test]
async fn test_journal() {
let mut jnl: TestJournal = Default::default();
let seq = jnl.next();
assert_eq!(jnl.next(), 0);
assert_eq!(jnl.append(seq, json!(10)).await.unwrap(), ());
assert_eq!(jnl.next(), 1);
assert!(jnl.append(0, json!(0)).await.is_err());
let seq = jnl.next();
assert_eq!(jnl.append(seq, json!(20)).await.unwrap(), ());
assert_eq!(jnl.replay(1).await.unwrap(), vec!(json!(20)));
}
#[tokio::test]
async fn test_new_table() {
let t1: Table<TestJournal> = Table::new(Default::default()).await.unwrap();
match t1.game {
GameState::Bidding { dealer, deal } => (),
_ => panic!("should be Bidding"),
};
}
#[tokio::test]
async fn test_replay_table() {
let t1: Table<TestJournal> = Table::new(Default::default()).await.unwrap();
let game = t1.game;
let journal = t1.journal;
let t2 = Table::replay(journal).await.unwrap();
assert_eq!(game, t2.game);
}
}
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