74 lines
2.3 KiB
Rust
74 lines
2.3 KiB
Rust
use crate::db::errors::{DataError, MigrationError};
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use crate::db::migrations::{get_migration_version, Migrations};
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use crate::db::variables::Variables;
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use log::info;
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use sled::Db;
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use std::path::Path;
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pub mod data_migrations;
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pub mod errors;
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pub mod migrations;
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pub mod schema;
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pub mod variables;
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#[derive(Clone)]
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pub struct Database {
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db: Db,
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pub(crate) variables: Variables,
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pub(crate) migrations: Migrations,
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}
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impl Database {
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pub fn new<P: AsRef<Path>>(path: P) -> Result<Database, DataError> {
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let db = sled::open(path)?;
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let variables = db.open_tree("variables")?;
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let migrations = db.open_tree("migrations")?;
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Ok(Database {
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db: db.clone(),
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variables: Variables(variables),
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migrations: Migrations(migrations),
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})
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}
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pub fn migrate(&self, to_version: u32) -> Result<(), DataError> {
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//get version from db
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let db_version = get_migration_version(&self)?;
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if db_version < to_version {
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info!(
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"Migrating database from version {} to version {}",
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db_version, to_version
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);
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//if db version < to_version, proceed
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//produce range of db_version+1 .. to_version (inclusive)
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let versions_to_run: Vec<u32> = ((db_version + 1)..=to_version).collect();
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let migrations = data_migrations::get_migrations(&versions_to_run)?;
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//execute each closure.
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for (version, migration_func) in versions_to_run.iter().zip(migrations) {
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//This needs to be transactional on migrations
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//keyspace. abort on migration func error.
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info!("Applying migration: {}", version);
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match migration_func(&self) {
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Ok(_) => Ok(()),
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Err(e) => Err(e),
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}?;
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self.migrations.set_migration_version(*version)?;
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}
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info!("Done applying migrations.");
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Ok(())
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} else if db_version > to_version {
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//if db version > to_version, cannot downgrade error
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Err(MigrationError::CannotDowngrade.into())
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} else {
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//if db version == to_version, do nothing
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info!("No database migrations needed.");
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Ok(())
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}
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}
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}
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