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graph: make quadstore init functions idempotent

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This commit is contained in:
Barak Michener 2015-11-25 14:28:15 -05:00
parent 9658689995
commit e849da9402
7 changed files with 63 additions and 24 deletions
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19
graph/bolt/bolt_test.go
View file

@ -153,10 +153,9 @@ func TestLoadDatabase(t *testing.T) {
t.Errorf("Unexpected quadstore size, got:%d expect:1", s)
}
qs.Close()
os.RemoveAll(tmpFile.Name())
err = createNewBolt(tmpFile.Name(), nil)
if err != nil {
if err != graph.ErrDatabaseExists {
t.Fatal("Failed to create Bolt database.", err)
}
qs, err = newQuadStore(tmpFile.Name(), nil)
@ -172,20 +171,20 @@ func TestLoadDatabase(t *testing.T) {
//Test horizon
horizon := qs.Horizon()
if horizon.Int() != 0 {
t.Errorf("Unexpected horizon value, got:%d expect:0", horizon.Int())
if horizon.Int() != 1 {
t.Errorf("Unexpected horizon value, got:%d expect:1", horizon.Int())
}
w.AddQuadSet(makeQuadSet())
if s := qs.Size(); s != 11 {
t.Errorf("Unexpected quadstore size, got:%d expect:11", s)
if s := qs.Size(); s != 12 {
t.Errorf("Unexpected quadstore size, got:%d expect:12", s)
}
if s := ts2.SizeOf(qs.ValueOf("B")); s != 5 {
t.Errorf("Unexpected quadstore size, got:%d expect:5", s)
}
horizon = qs.Horizon()
if horizon.Int() != 11 {
t.Errorf("Unexpected horizon value, got:%d expect:11", horizon.Int())
if horizon.Int() != 12 {
t.Errorf("Unexpected horizon value, got:%d expect:12", horizon.Int())
}
w.RemoveQuad(quad.Quad{
@ -194,8 +193,8 @@ func TestLoadDatabase(t *testing.T) {
Object: "B",
Label: "",
})
if s := qs.Size(); s != 10 {
t.Errorf("Unexpected quadstore size after RemoveQuad, got:%d expect:10", s)
if s := qs.Size(); s != 11 {
t.Errorf("Unexpected quadstore size after RemoveQuad, got:%d expect:11", s)
}
if s := ts2.SizeOf(qs.ValueOf("B")); s != 4 {
t.Errorf("Unexpected quadstore size, got:%d expect:4", s)

5
graph/bolt/quadstore.go
View file

@ -85,6 +85,11 @@ func createNewBolt(path string, _ graph.Options) error {
defer db.Close()
qs := &QuadStore{}
qs.db = db
defer qs.Close()
err = qs.getMetadata()
if err != errNoBucket {
return graph.ErrDatabaseExists
}
err = qs.createBuckets()
if err != nil {
return err

18
graph/leveldb/leveldb_test.go
View file

@ -154,7 +154,7 @@ func TestLoadDatabase(t *testing.T) {
qs.Close()
err = createNewLevelDB(tmpDir, nil)
if err != nil {
if err != graph.ErrDatabaseExists {
t.Fatal("Failed to create LevelDB database.")
}
qs, err = newQuadStore(tmpDir, nil)
@ -170,20 +170,20 @@ func TestLoadDatabase(t *testing.T) {
//Test horizon
horizon := qs.Horizon()
if horizon.Int() != 0 {
t.Errorf("Unexpected horizon value, got:%d expect:0", horizon.Int())
if horizon.Int() != 1 {
t.Errorf("Unexpected horizon value, got:%d expect:1", horizon.Int())
}
w.AddQuadSet(makeQuadSet())
if s := qs.Size(); s != 11 {
t.Errorf("Unexpected quadstore size, got:%d expect:11", s)
if s := qs.Size(); s != 12 {
t.Errorf("Unexpected quadstore size, got:%d expect:12", s)
}
if s := ts2.SizeOf(qs.ValueOf("B")); s != 5 {
t.Errorf("Unexpected quadstore size, got:%d expect:5", s)
}
horizon = qs.Horizon()
if horizon.Int() != 11 {
t.Errorf("Unexpected horizon value, got:%d expect:11", horizon.Int())
if horizon.Int() != 12 {
t.Errorf("Unexpected horizon value, got:%d expect:12", horizon.Int())
}
w.RemoveQuad(quad.Quad{
@ -192,8 +192,8 @@ func TestLoadDatabase(t *testing.T) {
Object: "B",
Label: "",
})
if s := qs.Size(); s != 10 {
t.Errorf("Unexpected quadstore size after RemoveQuad, got:%d expect:10", s)
if s := qs.Size(); s != 11 {
t.Errorf("Unexpected quadstore size after RemoveQuad, got:%d expect:11", s)
}
if s := ts2.SizeOf(qs.ValueOf("B")); s != 4 {
t.Errorf("Unexpected quadstore size, got:%d expect:4", s)

20
graph/leveldb/quadstore.go
View file

@ -48,6 +48,8 @@ const (
DefaultCacheSize = 2
DefaultWriteBufferSize = 20
QuadStoreType = "leveldb"
horizonKey = "__horizon"
sizeKey = "__size"
)
var (
@ -87,6 +89,16 @@ func createNewLevelDB(path string, _ graph.Options) error {
qs.writeopts = &opt.WriteOptions{
Sync: true,
}
qs.readopts = &opt.ReadOptions{}
_, err = qs.db.Get([]byte(horizonKey), qs.readopts)
if err != nil && err != leveldb.ErrNotFound {
glog.Errorln("couldn't read from leveldb during init")
return err
}
if err != leveldb.ErrNotFound {
return graph.ErrDatabaseExists
}
// Write some metadata
qs.Close()
return nil
}
@ -343,7 +355,7 @@ func (qs *QuadStore) Close() {
buf := new(bytes.Buffer)
err := binary.Write(buf, binary.LittleEndian, qs.size)
if err == nil {
werr := qs.db.Put([]byte("__size"), buf.Bytes(), qs.writeopts)
werr := qs.db.Put([]byte(sizeKey), buf.Bytes(), qs.writeopts)
if werr != nil {
glog.Error("could not write size before closing!")
}
@ -353,7 +365,7 @@ func (qs *QuadStore) Close() {
buf.Reset()
err = binary.Write(buf, binary.LittleEndian, qs.horizon)
if err == nil {
werr := qs.db.Put([]byte("__horizon"), buf.Bytes(), qs.writeopts)
werr := qs.db.Put([]byte(horizonKey), buf.Bytes(), qs.writeopts)
if werr != nil {
glog.Error("could not write horizon before closing!")
}
@ -444,11 +456,11 @@ func (qs *QuadStore) getInt64ForKey(key string, empty int64) (int64, error) {
func (qs *QuadStore) getMetadata() error {
var err error
qs.size, err = qs.getInt64ForKey("__size", 0)
qs.size, err = qs.getInt64ForKey(sizeKey, 0)
if err != nil {
return err
}
qs.horizon, err = qs.getInt64ForKey("__horizon", 0)
qs.horizon, err = qs.getInt64ForKey(horizonKey, 0)
return err
}

1
graph/quadstore.go
View file

@ -140,6 +140,7 @@ func (d Options) BoolKey(key string) (bool, bool, error) {
}
var ErrCannotBulkLoad = errors.New("quadstore: cannot bulk load")
var ErrDatabaseExists = errors.New("quadstore: cannot init; database already exists")
type BulkLoader interface {
// BulkLoad loads Quads from a quad.Unmarshaler in bulk to the QuadStore.

11
graph/sql/quadstore.go
View file

@ -64,6 +64,7 @@ func connectSQLTables(addr string, _ graph.Options) (*sql.DB, error) {
func createSQLTables(addr string, options graph.Options) error {
conn, err := connectSQLTables(addr, options)
defer conn.Close()
if err != nil {
return err
}
@ -89,6 +90,11 @@ func createSQLTables(addr string, options graph.Options) error {
UNIQUE(subject_hash, predicate_hash, object_hash, label_hash)
);`)
if err != nil {
tx.Rollback()
errd := err.(*pq.Error)
if errd.Code == "42P07" {
return graph.ErrDatabaseExists
}
glog.Errorf("Cannot create quad table: %v", quadTable)
return err
}
@ -105,6 +111,7 @@ func createSQLTables(addr string, options graph.Options) error {
`, factor, factor, factor))
if err != nil {
glog.Errorf("Cannot create indices: %v", index)
tx.Rollback()
return err
}
tx.Commit()
@ -310,7 +317,9 @@ func (qs *QuadStore) Horizon() graph.PrimaryKey {
var horizon int64
err := qs.db.QueryRow("SELECT horizon FROM quads ORDER BY horizon DESC LIMIT 1;").Scan(&horizon)
if err != nil {
glog.Errorf("Couldn't execute horizon: %v", err)
if err != sql.ErrNoRows {
glog.Errorf("Couldn't execute horizon: %v", err)
}
return graph.NewSequentialKey(0)
}
return graph.NewSequentialKey(horizon)