252 lines
7.1 KiB
Rust
252 lines
7.1 KiB
Rust
// Copyright 2015-2017 Parity Technologies (UK) Ltd.
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// This file is part of Parity.
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// Parity is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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// Parity is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with Parity. If not, see <http://www.gnu.org/licenses/>.
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//! Tests for migrations.
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//! A random temp directory is created. A database is created within it, and migrations
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//! are performed in temp sub-directories.
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use std::collections::BTreeMap;
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use std::sync::Arc;
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use std::path::{Path, PathBuf};
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use {Batch, Config, Error, SimpleMigration, Migration, Manager, ChangeColumns};
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use kvdb::Database;
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use devtools::RandomTempPath;
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fn db_path(path: &Path) -> PathBuf {
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let mut p = path.to_owned();
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p.push("db");
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p
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}
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// initialize a database at the given directory with the given values.
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fn make_db(path: &Path, pairs: BTreeMap<Vec<u8>, Vec<u8>>) {
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let db = Database::open_default(path.to_str().unwrap()).expect("failed to open temp database");
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{
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let mut transaction = db.transaction();
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for (k, v) in pairs {
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transaction.put(None, &k, &v);
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}
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db.write(transaction).expect("failed to write db transaction");
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}
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}
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// helper for verifying a migrated database.
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fn verify_migration(path: &Path, pairs: BTreeMap<Vec<u8>, Vec<u8>>) {
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let db = Database::open_default(path.to_str().unwrap()).unwrap();
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for (k, v) in pairs {
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let x = db.get(None, &k).unwrap().unwrap();
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assert_eq!(&x[..], &v[..]);
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}
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}
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struct Migration0;
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impl SimpleMigration for Migration0 {
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fn columns(&self) -> Option<u32> { None }
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fn version(&self) -> u32 { 1 }
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fn simple_migrate(&mut self, mut key: Vec<u8>, mut value: Vec<u8>) -> Option<(Vec<u8>, Vec<u8>)> {
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key.push(0x11);
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value.push(0x22);
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Some((key, value))
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}
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}
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struct Migration1;
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impl SimpleMigration for Migration1 {
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fn columns(&self) -> Option<u32> { None }
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fn version(&self) -> u32 { 2 }
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fn simple_migrate(&mut self, key: Vec<u8>, _value: Vec<u8>) -> Option<(Vec<u8>, Vec<u8>)> {
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Some((key, vec![]))
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}
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}
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struct AddsColumn;
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impl Migration for AddsColumn {
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fn pre_columns(&self) -> Option<u32> { None }
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fn columns(&self) -> Option<u32> { Some(1) }
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fn version(&self) -> u32 { 1 }
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fn migrate(&mut self, source: Arc<Database>, config: &Config, dest: &mut Database, col: Option<u32>) -> Result<(), Error> {
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let mut batch = Batch::new(config, col);
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for (key, value) in source.iter(col).into_iter().flat_map(|inner| inner) {
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batch.insert(key.into_vec(), value.into_vec(), dest)?;
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}
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if col == Some(1) {
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batch.insert(vec![1, 2, 3], vec![4, 5, 6], dest)?;
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}
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batch.commit(dest)
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}
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}
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#[test]
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fn one_simple_migration() {
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let dir = RandomTempPath::create_dir();
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let db_path = db_path(dir.as_path());
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let mut manager = Manager::new(Config::default());
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make_db(&db_path, map![vec![] => vec![], vec![1] => vec![1]]);
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let expected = map![vec![0x11] => vec![0x22], vec![1, 0x11] => vec![1, 0x22]];
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manager.add_migration(Migration0).unwrap();
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let end_path = manager.execute(&db_path, 0).unwrap();
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verify_migration(&end_path, expected);
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}
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#[test]
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#[should_panic]
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fn no_migration_needed() {
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let dir = RandomTempPath::create_dir();
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let db_path = db_path(dir.as_path());
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let mut manager = Manager::new(Config::default());
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make_db(&db_path, map![vec![] => vec![], vec![1] => vec![1]]);
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manager.add_migration(Migration0).unwrap();
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manager.execute(&db_path, 1).unwrap();
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}
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#[test]
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#[should_panic]
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fn wrong_adding_order() {
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let dir = RandomTempPath::create_dir();
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let db_path = db_path(dir.as_path());
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let mut manager = Manager::new(Config::default());
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make_db(&db_path, map![vec![] => vec![], vec![1] => vec![1]]);
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manager.add_migration(Migration1).unwrap();
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manager.add_migration(Migration0).unwrap();
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}
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#[test]
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fn multiple_migrations() {
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let dir = RandomTempPath::create_dir();
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let db_path = db_path(dir.as_path());
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let mut manager = Manager::new(Config::default());
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make_db(&db_path, map![vec![] => vec![], vec![1] => vec![1]]);
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let expected = map![vec![0x11] => vec![], vec![1, 0x11] => vec![]];
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manager.add_migration(Migration0).unwrap();
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manager.add_migration(Migration1).unwrap();
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let end_path = manager.execute(&db_path, 0).unwrap();
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verify_migration(&end_path, expected);
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}
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#[test]
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fn second_migration() {
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let dir = RandomTempPath::create_dir();
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let db_path = db_path(dir.as_path());
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let mut manager = Manager::new(Config::default());
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make_db(&db_path, map![vec![] => vec![], vec![1] => vec![1]]);
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let expected = map![vec![] => vec![], vec![1] => vec![]];
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manager.add_migration(Migration0).unwrap();
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manager.add_migration(Migration1).unwrap();
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let end_path = manager.execute(&db_path, 1).unwrap();
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verify_migration(&end_path, expected);
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}
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#[test]
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fn first_and_noop_migration() {
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let dir = RandomTempPath::create_dir();
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let db_path = db_path(dir.as_path());
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let mut manager = Manager::new(Config::default());
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make_db(&db_path, map![vec![] => vec![], vec![1] => vec![1]]);
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let expected = map![vec![0x11] => vec![0x22], vec![1, 0x11] => vec![1, 0x22]];
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manager.add_migration(Migration0).unwrap();
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let end_path = manager.execute(&db_path, 0).unwrap();
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verify_migration(&end_path, expected);
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}
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#[test]
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fn noop_and_second_migration() {
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let dir = RandomTempPath::create_dir();
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let db_path = db_path(dir.as_path());
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let mut manager = Manager::new(Config::default());
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make_db(&db_path, map![vec![] => vec![], vec![1] => vec![1]]);
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let expected = map![vec![] => vec![], vec![1] => vec![]];
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manager.add_migration(Migration1).unwrap();
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let end_path = manager.execute(&db_path, 0).unwrap();
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verify_migration(&end_path, expected);
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}
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#[test]
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fn is_migration_needed() {
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let mut manager = Manager::new(Config::default());
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manager.add_migration(Migration0).unwrap();
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manager.add_migration(Migration1).unwrap();
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assert!(manager.is_needed(0));
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assert!(manager.is_needed(1));
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assert!(!manager.is_needed(2));
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}
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#[test]
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fn pre_columns() {
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let mut manager = Manager::new(Config::default());
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manager.add_migration(AddsColumn).unwrap();
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let dir = RandomTempPath::create_dir();
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let db_path = db_path(dir.as_path());
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// this shouldn't fail to open the database even though it's one column
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// short of the one before it.
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manager.execute(&db_path, 0).unwrap();
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}
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#[test]
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fn change_columns() {
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use kvdb::DatabaseConfig;
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let mut manager = Manager::new(Config::default());
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manager.add_migration(ChangeColumns {
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pre_columns: None,
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post_columns: Some(4),
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version: 1,
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}).unwrap();
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let dir = RandomTempPath::create_dir();
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let db_path = db_path(dir.as_path());
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let new_path = manager.execute(&db_path, 0).unwrap();
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assert_eq!(db_path, new_path, "Changing columns is an in-place migration.");
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let config = DatabaseConfig::with_columns(Some(4));
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let db = Database::open(&config, new_path.to_str().unwrap()).unwrap();
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assert_eq!(db.num_columns(), 4);
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}
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