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use async_trait::async_trait;
use protocol::{bridge_engine::{GameState, Player, Bid, Deal}};
use rand::random;
use serde::{Deserialize, Serialize};
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> {
let result = query!(
r#"
insert into object_journal (id, seq, payload)
values ($1, $2, $3)
"#,
self.id,
seq,
payload,
)
.execute(&self.db)
.await;
if let Err(sqlx::Error::Database(e)) = result {
if e.constraint() == Some("journal_entry") {
return Err(BridgeError::JournalConflict(format!("{}", self.id), seq));
}
}
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
}
}
#[derive(PartialEq, Eq, Clone, Debug, Serialize, Deserialize)]
pub enum TableUpdate {
NewDeal(Deal, Player),
ChangeSettings(TableSettings),
Bid(Bid),
}
#[derive(PartialEq, Eq, Clone, Debug, Serialize, Deserialize, Default)]
pub struct TableSettings {
west_player: Option<String>,
nort_player: Option<String>,
east_player: Option<String>,
south_player: Option<String>,
}
pub struct Table<J>
where
J: Journal,
{
journal: J,
settings: TableSettings,
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 = Self::init(&mut journal).await?;
Ok(Table { journal, game, settings: Default::default() })
}
async fn init(journal: &mut J) -> Result<GameState, BridgeError> {
let game = GameState::new(random(), random());
journal.append(0, json!(game)).await?;
Ok(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, settings: Default::default() } )
}
pub async fn new_or_replay(mut journal: J) -> Result<Self, BridgeError> {
let game = Self::init(&mut journal).await;
if let Err(BridgeError::JournalConflict(..)) = game {
return Self::replay(journal).await;
}
Ok(Self { journal, game: game?, settings: Default::default() } )
}
}
pub fn advance_play<J: Journal>(table: &mut Table<J>) {
todo!()
}
#[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 { .. } => (),
_ => 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);
}
#[tokio::test]
async fn test_advance_play() {
let mut t1: Table<TestJournal> = Table::new(Default::default()).await.unwrap();
let player = t1.game().current_player();
advance_play(&mut t1);
assert_ne!(player, t1.game().current_player());
}
}
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