Add server

musicus_server/src/database/mod.rs

@@ -0,0 +1,39 @@
+use anyhow::Result;
+use diesel::r2d2;
+use diesel::PgConnection;
+
+pub mod ensembles;
+pub use ensembles::*;
+
+pub mod instruments;
+pub use instruments::*;
+
+pub mod persons;
+pub use persons::*;
+
+pub mod recordings;
+pub use recordings::*;
+
+pub mod users;
+pub use users::*;
+
+pub mod works;
+pub use works::*;
+
+mod schema;
+
+/// A pool of connections to the database.
+pub type DbPool = r2d2::Pool<r2d2::ConnectionManager<PgConnection>>;
+
+/// One database connection from the connection pool.
+pub type DbConn = r2d2::PooledConnection<r2d2::ConnectionManager<PgConnection>>;
+
+/// Create a connection pool for a database. This will look for the database URL in the
+/// "MUSICUS_DATABASE_URL" environment variable and fail, if that is not set.
+pub fn connect() -> Result<DbPool> {
+    let url = std::env::var("MUSICUS_DATABASE_URL")?;
+    let manager = r2d2::ConnectionManager::<PgConnection>::new(url);
+    let pool = r2d2::Pool::new(manager)?;
+
+    Ok(pool)
+}