init rust db backend

lootalot_db/Cargo.toml

@@ -0,0 +1,12 @@
+[package]
+name = "lootalot-db"
+version = "0.1.0"
+authors = ["Artus <artus@landoftheunicorn.ovh>"]
+edition = "2018"
+
+[dependencies]
+dotenv = "*"
+
+[dependencies.diesel]
+version = "1.0"
+features = ["sqlite"]

lootalot_db/diesel.toml

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+# For documentation on how to configure this file,
+# see diesel.rs/guides/configuring-diesel-cli
+
+[print_schema]
+file = "src/schema.rs"

lootalot_db/migrations/2019-06-10-123922_create_items/down.sql

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+DROP TABLE items;
+

lootalot_db/migrations/2019-06-10-123922_create_items/up.sql

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+CREATE TABLE items (
+  id INTEGER PRIMARY KEY,
+  name VARCHAR NOT NULL,
+  base_price INTEGER NOT NULL
+);

lootalot_db/migrations/2019-06-10-123940_create_players/down.sql

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+DROP TABLE players;

lootalot_db/migrations/2019-06-10-123940_create_players/up.sql

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+CREATE TABLE players (
+  id INTEGER PRIMARY KEY,
+  name VARCHAR NOT NULL,
+  debt INTEGER DEFAULT 0, -- debt to the group in copper pieces
+  cp INTEGER DEFAULT 0,
+  sp INTEGER DEFAULT 0,
+  gp INTEGER DEFAULT 0,
+  pp INTEGER DEFAULT 0
+);

lootalot_db/migrations/2019-06-10-124013_create_looted/down.sql

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+DROP TABLE looted;

lootalot_db/migrations/2019-06-10-124013_create_looted/up.sql

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+CREATE TABLE looted (
+  id INTEGER PRIMARY KEY,
+  player_id INTEGER NOT NULL,
+  item_id INTEGER NOT NULL,
+  acquired_date DATE DEFAULT NOW,
+  FOREIGN KEY (player_id) REFERENCES players(id),
+  FOREIGN KEY (item_id) REFERENCES items(id)
+);

lootalot_db/src/lib.rs

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+#[macro_use] extern crate diesel;
+             extern crate dotenv;
+
+use diesel::prelude::*;
+use dotenv::dotenv;
+use std::env;
+
+pub fn establish_connection() -> Result<SqliteConnection, String> {
+    dotenv().ok();
+    let database_url =
+        env::var("DATABASE_URL")
+            .expect("DATABASE_URL must be set !");
+    SqliteConnection::establish(&database_url)
+        .map_err(|e| format!("Error connecting to {} : {:?}", database_url, e))
+}
+
+pub mod schema;
+pub mod models;
+
+pub fn list_players() -> Vec<models::Player> {
+    use schema::players::dsl::*;
+    let conn = establish_connection().unwrap();
+    players
+        .load::<models::Player>(&conn)
+        .expect("Error loading players")
+        .collect()
+}
+
+
+
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    fn with_db<F>(f: F) -> ()
+        where F: Fn(&SqliteConnection) -> (),
+    {
+        let conn = establish_connection().unwrap();
+        conn.test_transaction::<_,diesel::result::Error,_>(|| {
+            f(&conn);
+            Ok(())
+        });
+    }
+
+    #[test]
+    fn database_connection() {
+        use crate::establish_connection;
+        let conn = establish_connection();
+        assert_eq!(conn.is_ok(), true);
+    }
+}

lootalot_db/src/models.rs

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+use crate::*;
+use crate::schema::players;
+
+#[derive(Queryable)]
+pub struct Player {
+    id: i32,
+    name: String,
+    debt: i32,
+    cp: i32,
+    sp: i32,
+    gp: i32,
+    pp: i32,
+}
+
+#[derive(Insertable)]
+#[table_name="players"]
+pub struct NewPlayer<'a> {
+    name: &'a str,
+    cp: i32,
+    sp: i32,
+    gp: i32,
+    pp: i32,
+}
+
+impl<'a> NewPlayer<'a> {
+
+    fn new(
+        name: &'a str,
+        wealth: Option<(i32,i32,i32,i32)>,
+    ) -> Self {
+        let (cp,sp,gp,pp) = wealth.unwrap_or((0,0,0,0));
+        NewPlayer { name, cp, sp, gp, pp }
+    }
+
+    fn insert(&self) -> Result<(),()> {
+        Err(())
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use crate::tests;
+    use super::*;
+
+    #[test]
+    fn new_player_only_with_name() {
+        let n = NewPlayer::new("Féfi", None);
+        assert_eq!(n.name, "Féfi");
+        assert_eq!(n.cp, 0);
+        assert_eq!(n.sp, 0);
+        assert_eq!(n.gp, 0);
+        assert_eq!(n.pp, 0);
+    }
+
+    #[test]
+    fn new_player_with_wealth() {
+        let initial_wealth = (1, 2, 3, 4);
+        let n = NewPlayer::new("Féfi", Some(initial_wealth));
+        assert_eq!(initial_wealth, (n.cp, n.sp, n.gp, n.pp));
+    }
+}

lootalot_db/src/schema.rs

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+table! {
+    items (id) {
+        id -> Nullable<Integer>,
+        name -> Text,
+        base_price -> Integer,
+    }
+}
+
+table! {
+    looted (id) {
+        id -> Nullable<Integer>,
+        player_id -> Integer,
+        item_id -> Integer,
+        acquired_date -> Nullable<Date>,
+    }
+}
+
+table! {
+    players (id) {
+        id -> Nullable<Integer>,
+        name -> Text,
+        debt -> Nullable<Integer>,
+        cp -> Nullable<Integer>,
+        sp -> Nullable<Integer>,
+        gp -> Nullable<Integer>,
+        pp -> Nullable<Integer>,
+    }
+}
+
+joinable!(looted -> items (item_id));
+joinable!(looted -> players (player_id));
+
+allow_tables_to_appear_in_same_query!(
+    items,
+    looted,
+    players,
+);