veloren/server/src/persistence/mod.rs

pub mod character;

mod error;
mod models;
mod schema;

extern crate diesel;

use diesel::prelude::*;
use diesel_migrations::embed_migrations;
use std::{env, fs, path::PathBuf};

// See: https://docs.rs/diesel_migrations/1.4.0/diesel_migrations/macro.embed_migrations.html
// This macro is called at build-time, and produces the necessary migration info
// for the `embedded_migrations` call below.
embed_migrations!();

pub fn run_migrations(db_dir: &str) -> Result<(), diesel_migrations::RunMigrationsError> {
    let db_dir = &apply_saves_dir_override(db_dir);
    let _ = fs::create_dir(format!("{}/", db_dir));
    embedded_migrations::run_with_output(&establish_connection(db_dir), &mut std::io::stdout())
}

fn establish_connection(db_dir: &str) -> SqliteConnection {
    let db_dir = &apply_saves_dir_override(db_dir);
    let database_url = format!("{}/db.sqlite", db_dir);
    SqliteConnection::establish(&database_url)
        .unwrap_or_else(|_| panic!("Error connecting to {}", database_url))
}

fn apply_saves_dir_override(db_dir: &str) -> String {
    if let Some(val) = env::var_os("VELOREN_SAVES_DIR") {
        let path = PathBuf::from(val);
        if path.exists() || path.parent().map(|x| x.exists()).unwrap_or(false) {
            // Only allow paths with valid unicode characters
            match path.to_str() {
                Some(path) => return path.to_owned(),
                None => {},
            }
        }
        log::warn!("VELOREN_SAVES_DIR points to an invalid path.");
    }
    db_dir.to_string()
}