feat(db): add diesel and sqlite3 as dependencies

.env.example

@@ -1 +1,2 @@
-RUST_LOG =
+RUST_LOG=
+DATABASE_URL=

Cargo.toml

@@ -13,5 +13,7 @@ members = ["server", "client"]
 uuid = { version = "^0.8", features = ["v4"] }
 twox-hash = "^1.6"
 thiserror = "^1.0"
+diesel = { version = "^1.4", features = ["sqlite"] }
+dotenv = "^0.15"
 
 [dev-dependencies]

diesel.toml

@@ -0,0 +1,5 @@
+# For documentation on how to configure this file,
+# see diesel.rs/guides/configuring-diesel-cli
+
+[print_schema]
+file = "src/schema.rs"

migrations/2021-03-02-022949_create_game_file_table/down.sql

@@ -0,0 +1,2 @@
+-- This file should undo anything in `up.sql`
+DROP TABLE game_file

migrations/2021-03-02-022949_create_game_file_table/up.sql

@@ -0,0 +1,8 @@
+-- Your SQL goes here
+CREATE TABLE game_file (
+    id INTEGER PRIMARY KEY,
+    original_path BLOB NOT NULL, -- TEXT assumes a Unicode Encoding
+    file_hash INTEGER NOT NULL, -- u64, but that's not
+    game_save_id INTEGER NOT NULL,
+    FOREIGN KEY (game_save_id) REFERENCES game_save_location (id)
+)

migrations/2021-03-02-025744_create_game_save_loc_table/down.sql

@@ -0,0 +1,2 @@
+-- This file should undo anything in `up.sql`
+DROP TABLE game_save_location

migrations/2021-03-02-025744_create_game_save_loc_table/up.sql

@@ -0,0 +1,7 @@
+-- Your SQL goes here
+CREATE TABLE game_save_location (
+    id INTEGER PRIMARY KEY,
+    friendly_name TEXT -- This can be null
+    original_PATH BLOB NOT NULL,
+    uuid BLOB NOT NULL
+)

src/db.rs

@@ -0,0 +1,14 @@
+use diesel::prelude::*;
+use diesel::sqlite::SqliteConnection;
+use dotenv::dotenv;
+use std::env;
+
+pub fn establish_connection() -> SqliteConnection {
+    dotenv().ok();
+
+    // TODO: Consider whether it is best practice to panic here
+    // or have establish_connection return a Result with a thiserror enum
+
+    let db_url = env::var("DATABASE_URL").expect("$DATABASE_URL was not set");
+    SqliteConnection::establish(&db_url).expect(&format!("Error connecting to {}", db_url))
+}

src/lib.rs

@@ -1,4 +1,10 @@
+#[macro_use]
+extern crate diesel;
+
+pub mod db;
 pub mod game;
+pub mod models;
+pub mod schema;
 
 #[cfg(test)]
 mod tests {

src/models.rs

@@ -0,0 +1,8 @@
+use std::path::PathBuf;
+
+#[derive(Queryable)]
+pub struct GameFile {
+    pub id: i32,
+    pub original_path: PathBuf,
+    pub file_hash: u64,
+}

src/schema.rs

@@ -0,0 +1,23 @@
+table! {
+    game_file (id) {
+        id -> Nullable<Integer>,
+        original_path -> Binary,
+        file_hash -> Integer,
+        game_save_id -> Integer,
+    }
+}
+
+table! {
+    game_save_location (id) {
+        id -> Nullable<Integer>,
+        friendly_name -> Text,
+        uuid -> Binary,
+    }
+}
+
+joinable!(game_file -> game_save_location (game_save_id));
+
+allow_tables_to_appear_in_same_query!(
+    game_file,
+    game_save_location,
+);