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Better handling of multiple migrations (#1747) 

* add migration tests that catch the bug

* make multiple migrations more robust

* clean up migrations ordering

* update comment [ci skip]

* remove explicit iter
This commit is contained in:
keorn 2016-07-28 12:05:41 +02:00 committed by Gav Wood
parent 6b1e722a6b
commit 30ba10e10c
2 changed files with 48 additions and 9 deletions
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17
util/src/migration/mod.rs
View File

@ -180,12 +180,11 @@ impl Manager {
/// Adds new migration rules.
pub fn add_migration<T>(&mut self, migration: T) -> Result<(), Error> where T: Migration {
let version_match = match self.migrations.last() {
Some(last) => last.version() + 1 == migration.version(),
let is_new = match self.migrations.last() {
Some(last) => migration.version() > last.version(),
None => true,
};
match version_match {
match is_new {
true => Ok(self.migrations.push(Box::new(migration))),
false => Err(Error::CannotAddMigration),
}
@ -195,7 +194,8 @@ impl Manager {
/// and producing a path where the final migration lives.
pub fn execute(&mut self, old_path: &Path, version: u32) -> Result<PathBuf, Error> {
let config = self.config.clone();
let migrations = try!(self.migrations_from(version).ok_or(Error::MigrationImpossible));
let mut migrations = self.migrations_from(version);
if migrations.is_empty() { return Err(Error::MigrationImpossible) };
let db_config = DatabaseConfig {
max_open_files: 64,
cache_size: None,
@ -235,10 +235,9 @@ impl Manager {
}
}
fn migrations_from(&mut self, version: u32) -> Option<&mut [Box<Migration>]> {
// index of the first required migration
let position = self.migrations.iter().position(|m| m.version() == version + 1);
position.map(move |p| &mut self.migrations[p..])
/// Find all needed migrations.
fn migrations_from(&mut self, version: u32) -> Vec<&mut Box<Migration>> {
self.migrations.iter_mut().filter(|m| m.version() > version).collect()
}
}

40
util/src/migration/tests.rs
View File

@ -109,6 +109,18 @@ fn no_migration_needed() {
manager.execute(&db_path, 1).unwrap();
}
#[test]
#[should_panic]
fn wrong_adding_order() {
let dir = RandomTempPath::create_dir();
let db_path = db_path(dir.as_path());
let mut manager = Manager::new(Config::default());
make_db(&db_path, map![vec![] => vec![], vec![1] => vec![1]]);
manager.add_migration(Migration1).unwrap();
manager.add_migration(Migration0).unwrap();
}
#[test]
fn multiple_migrations() {
let dir = RandomTempPath::create_dir();
@ -139,6 +151,34 @@ fn second_migration() {
verify_migration(&end_path, expected);
}
#[test]
fn first_and_noop_migration() {
let dir = RandomTempPath::create_dir();
let db_path = db_path(dir.as_path());
let mut manager = Manager::new(Config::default());
make_db(&db_path, map![vec![] => vec![], vec![1] => vec![1]]);
let expected = map![vec![0x11] => vec![0x22], vec![1, 0x11] => vec![1, 0x22]];
manager.add_migration(Migration0).unwrap();
let end_path = manager.execute(&db_path, 0).unwrap();
verify_migration(&end_path, expected);
}
#[test]
fn noop_and_second_migration() {
let dir = RandomTempPath::create_dir();
let db_path = db_path(dir.as_path());
let mut manager = Manager::new(Config::default());
make_db(&db_path, map![vec![] => vec![], vec![1] => vec![1]]);
let expected = map![vec![] => vec![], vec![1] => vec![]];
manager.add_migration(Migration1).unwrap();
let end_path = manager.execute(&db_path, 0).unwrap();
verify_migration(&end_path, expected);
}
#[test]
fn is_migration_needed() {
let mut manager = Manager::new(Config::default());