package channeldb import ( "bytes" "testing" "github.com/boltdb/bolt" "github.com/go-errors/errors" ) // TestVersionFetchPut checks the propernces of fetch/put methods // and also initialization of meta data in case if don't have any in // database. func TestVersionFetchPut(t *testing.T) { db, cleanUp, err := makeTestDB() defer cleanUp() if err != nil { t.Fatal(err) } meta, err := db.FetchMeta(nil) if err != nil { t.Fatal(err) } if meta.DbVersionNumber != getLatestDBVersion(dbVersions) { t.Fatal("initialization of meta information wasn't performed") } var newVersion uint32 = getLatestDBVersion(dbVersions) + 1 meta.DbVersionNumber = newVersion if err := db.PutMeta(meta); err != nil { t.Fatalf("update of meta failed %v", err) } meta, err = db.FetchMeta(nil) if err != nil { t.Fatal(err) } if meta.DbVersionNumber != newVersion { t.Fatal("update of meta information wasn't performed") } } // TestOrderOfMigrations checks that migrations are applied in proper order. func TestOrderOfMigrations(t *testing.T) { appliedMigration := -1 versions := []version{ {0, nil}, {1, nil}, {2, func(tx *bolt.Tx) error { appliedMigration = 2 return nil }}, {3, func(tx *bolt.Tx) error { appliedMigration = 3 return nil }}, } // Retrieve the migration that should be applied to db, as far as // current version is 1, we skip zero and first versions. migrations := getMigrationsToApply(versions, 1) if len(migrations) != 2 { t.Fatal("incorrect number of migrations to apply") } // Apply first migration. migrations[0](nil) // Check that first migration corresponds to the second version. if appliedMigration != 2 { t.Fatal("incorrect order of applying migrations") } // Apply second migration. migrations[1](nil) // Check that second migration corresponds to the third version. if appliedMigration != 3 { t.Fatal("incorrect order of applying migrations") } } // TestGlobalVersionList checks that there is no mistake in global version list // in terms of version ordering. func TestGlobalVersionList(t *testing.T) { if dbVersions == nil { t.Fatal("can't find versions list") } if len(dbVersions) == 0 { t.Fatal("db versions list is empty") } prev := dbVersions[0].number for i := 1; i < len(dbVersions); i++ { version := dbVersions[i].number if version == prev { t.Fatal("duplicates db versions") } if version < prev { t.Fatal("order of db versions is wrong") } prev = version } } // applyMigration is a helper test function that encapsulates the general steps // which are needed to properly check the result of applying migration function. func applyMigration(t *testing.T, beforeMigration, afterMigration func(d *DB), migrationFunc migration, shouldFail bool) { cdb, cleanUp, err := makeTestDB() defer cleanUp() if err != nil { t.Fatal(err) } // beforeMigration usually used for populating the database // with test data. beforeMigration(cdb) // Create test meta info with zero database version and put it on disk. // Than creating the version list pretending that new version was added. meta := &Meta{DbVersionNumber: 0} if err := cdb.PutMeta(meta); err != nil { t.Fatal("unable to store meta data: %v", err) } versions := []version{ { number: 0, migration: nil, }, { number: 1, migration: migrationFunc, }, } defer func() { if r := recover(); r != nil { err = errors.New(r) } if err == nil && shouldFail { t.Fatal("error wasn't received on migration stage") } else if err != nil && !shouldFail { t.Fatal("error was received on migration stage") } // afterMigration usually used for checking the database state and // throwing the error if something went wrong. afterMigration(cdb) }() // Sync with the latest version - applying migration function. err = cdb.syncVersions(versions) } func TestMigrationWithPanic(t *testing.T) { bucketPrefix := []byte("somebucket") keyPrefix := []byte("someprefix") beforeMigration := []byte("beforemigration") afterMigration := []byte("aftermigration") beforeMigrationFunc := func(d *DB) { // Insert data in database and in order then make sure that the // key isn't changes in case of panic or fail. d.Update(func(tx *bolt.Tx) error { bucket, err := tx.CreateBucketIfNotExists(bucketPrefix) if err != nil { return err } bucket.Put(keyPrefix, beforeMigration) return nil }) } // Create migration function which changes the initialy created data and // throw the panic, in this case we pretending that something goes. migrationWithPanic := func(tx *bolt.Tx) error { bucket, err := tx.CreateBucketIfNotExists(bucketPrefix) if err != nil { return err } bucket.Put(keyPrefix, afterMigration) panic("panic!") } // Check that version of database and data wasn't changed. afterMigrationFunc := func(d *DB) { meta, err := d.FetchMeta(nil) if err != nil { t.Fatal(err) } if meta.DbVersionNumber != 0 { t.Fatal("migration paniced but version is changed") } err = d.Update(func(tx *bolt.Tx) error { bucket, err := tx.CreateBucketIfNotExists(bucketPrefix) if err != nil { return err } value := bucket.Get(keyPrefix) if !bytes.Equal(value, beforeMigration) { return errors.New("migration failed but data is " + "changed") } return nil }) if err != nil { t.Fatal(err) } } applyMigration(t, beforeMigrationFunc, afterMigrationFunc, migrationWithPanic, true) } func TestMigrationWithFatal(t *testing.T) { bucketPrefix := []byte("somebucket") keyPrefix := []byte("someprefix") beforeMigration := []byte("beforemigration") afterMigration := []byte("aftermigration") beforeMigrationFunc := func(d *DB) { d.Update(func(tx *bolt.Tx) error { bucket, err := tx.CreateBucketIfNotExists(bucketPrefix) if err != nil { return err } bucket.Put(keyPrefix, beforeMigration) return nil }) } // Create migration function which changes the initialy created data and // return the error, in this case we pretending that somthing goes // wrong. migrationWithFatal := func(tx *bolt.Tx) error { bucket, err := tx.CreateBucketIfNotExists(bucketPrefix) if err != nil { return err } bucket.Put(keyPrefix, afterMigration) return errors.New("some error!") } // Check that version of database and initial data wasn't changed. afterMigrationFunc := func(d *DB) { meta, err := d.FetchMeta(nil) if err != nil { t.Fatal(err) } if meta.DbVersionNumber != 0 { t.Fatal("migration failed but version is changed") } err = d.Update(func(tx *bolt.Tx) error { bucket, err := tx.CreateBucketIfNotExists(bucketPrefix) if err != nil { return err } value := bucket.Get(keyPrefix) if !bytes.Equal(value, beforeMigration) { return errors.New("migration failed but data is " + "changed") } return nil }) if err != nil { t.Fatal(err) } } applyMigration(t, beforeMigrationFunc, afterMigrationFunc, migrationWithFatal, true) } func TestMigrationWithoutErrors(t *testing.T) { bucketPrefix := []byte("somebucket") keyPrefix := []byte("someprefix") beforeMigration := []byte("beforemigration") afterMigration := []byte("aftermigration") // Populate database with initial data. beforeMigrationFunc := func(d *DB) { d.Update(func(tx *bolt.Tx) error { bucket, err := tx.CreateBucketIfNotExists(bucketPrefix) if err != nil { return err } bucket.Put(keyPrefix, beforeMigration) return nil }) } // Create migration function which changes the initialy created data. migrationWithoutErrors := func(tx *bolt.Tx) error { bucket, err := tx.CreateBucketIfNotExists(bucketPrefix) if err != nil { return err } bucket.Put(keyPrefix, afterMigration) return nil } // Check that version of database and data was properly changed. afterMigrationFunc := func(d *DB) { meta, err := d.FetchMeta(nil) if err != nil { t.Fatal(err) } if meta.DbVersionNumber != 1 { t.Fatal("version number isn't changed after " + "succesfully aplied migration") } err = d.Update(func(tx *bolt.Tx) error { bucket, err := tx.CreateBucketIfNotExists(bucketPrefix) if err != nil { return err } value := bucket.Get(keyPrefix) if !bytes.Equal(value, afterMigration) { return errors.New("migration wasn't applyied " + "properly") } return nil }) if err != nil { t.Fatal(err) } } applyMigration(t, beforeMigrationFunc, afterMigrationFunc, migrationWithoutErrors, false) }