lnd.xprv/channeldb/meta_test.go

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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")
}
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newVersion := 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.Fatalf("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)
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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)
}