add postgres trade stuff

src/entity/gateway/postgres/migrations/V0005__trade.sql

@@ -0,0 +1,5 @@
+create table trades (
+  id serial primary key not null,
+  character1 integer references character (id) not null,
+  character2 integer references character (id) not null,
+);

src/entity/gateway/postgres/models.rs

@@ -858,3 +858,19 @@ impl From<(CharacterEntityId, EquippedEntity)> for PgEquipped {
     }
 }
 
+#[derive(Debug, sqlx::FromRow)]
+pub struct PgTradeEntity {
+    id: i32,
+    character1: i32,
+    character2: i32,
+}
+
+impl From<PgTradeEntity> for TradeEntity {
+    fn from(other: PgTradeEntity) -> TradeEntity {
+        TradeEntity {
+            id: TradeId(other.id as u32),
+            character1: CharacterEntityId(other.character1 as u32),
+            character2: CharacterEntityId(other.character2 as u32),
+        }
+    }
+}

src/entity/gateway/postgres/postgres.rs

@@ -558,6 +558,16 @@ async fn get_bank_meseta(conn: &mut sqlx::PgConnection, char_id: &CharacterEntit
     Ok(Meseta(meseta.0 as u32))
 }
 
+async fn create_trade(conn: &mut sqlx::PgConnection, char_id1: &CharacterEntityId, char_id2: &CharacterEntityId) -> Result<TradeEntity, GatewayError>
+{
+    let trade = sqlx::query_as::<_, PgTradeEntity>(r#"insert into trades (character1, character2) values ($1, $2) returning *;"#)
+        .bind(char_id1.0)
+        .bind(char_id2.0)
+        .fetch_one(conn)
+        .await?;
+    Ok(trade.into())
+}
+
 #[async_trait::async_trait]
 impl EntityGateway for PostgresGateway {
     async fn transaction<'a>(&'a mut self) -> Result<Box<dyn EntityGatewayTransaction + 'a>, GatewayError>
@@ -693,6 +703,10 @@ impl EntityGateway for PostgresGateway {
     async fn get_bank_meseta(&mut self, char_id: &CharacterEntityId, bank: &BankName) -> Result<Meseta, GatewayError> {
         get_bank_meseta(&mut *self.pool.acquire().await?, char_id, bank).await
     }
+
+    async fn create_trade(&mut self, char_id1: &CharacterEntityId, char_id2: &CharacterEntityId) -> Result<TradeEntity, GatewayError> {
+        create_trade(&mut *self.pool.acquire().await?, char_id1, char_id2).await
+    }
 }
 
 
@@ -809,5 +823,9 @@ impl<'c> EntityGateway for PostgresTransaction<'c> {
     async fn get_bank_meseta(&mut self, char_id: &CharacterEntityId, bank: &BankName) -> Result<Meseta, GatewayError> {
         get_bank_meseta(&mut *self.pgtransaction, char_id, bank).await
     }
+
+    async fn create_trade(&mut self, char_id1: &CharacterEntityId, char_id2: &CharacterEntityId) -> Result<TradeEntity, GatewayError> {
+        create_trade(&mut *self.pgtransaction, char_id1, char_id2).await
+    }
 }