// Get returns a value given a key.
func (db *BigTable) Get(ctx storage.Context, tk storage.TKey) ([]byte, error) {
if db == nil {
return nil, fmt.Errorf("Can't call Get() on nil BigTable")
}
if ctx == nil {
return nil, fmt.Errorf("Received nil context in Get()")
}
unvKey, verKey, err := ctx.SplitKey(tk)
if err != nil {
dvid.Errorf("Error in Get(): %v\n", err)
}
r, err := tbl.ReadRow(db.ctx, encodeKey(unvKey))
//A missing row will return a zero-length map and a nil error
if len(r) == 0 {
return nil, err
}
if err != nil {
return nil, err
}
value, err := getValue(r, verKey)
if err != nil {
return nil, err
}
return value, nil
}
// GetRange returns a range of values spanning (kStart, kEnd) keys. These key-value
// pairs will be sorted in ascending key order. If the keys are versioned, all key-value
// pairs for the particular version will be returned.
func (db *LevelDB) GetRange(ctx storage.Context, kStart, kEnd storage.TKey) ([]*storage.TKeyValue, error) {
if ctx == nil {
return nil, fmt.Errorf("Received nil context in GetRange()")
}
ch := make(chan errorableKV)
// Run the range query on a potentially versioned key in a goroutine.
go func() {
if ctx == nil || !ctx.Versioned() {
db.unversionedRange(ctx, kStart, kEnd, ch, false)
} else {
db.versionedRange(ctx.(storage.VersionedCtx), kStart, kEnd, ch, false)
}
}()
// Consume the key-value pairs.
values := []*storage.TKeyValue{}
for {
result := <-ch
if result.KeyValue == nil {
return values, nil
}
if result.error != nil {
return nil, result.error
}
tk, err := ctx.TKeyFromKey(result.KeyValue.K)
if err != nil {
return nil, err
}
tkv := storage.TKeyValue{tk, result.KeyValue.V}
values = append(values, &tkv)
}
}
// Get returns a value given a key.
func (db *LevelDB) Get(ctx storage.Context, tk storage.TKey) ([]byte, error) {
if ctx == nil {
return nil, fmt.Errorf("Received nil context in Get()")
}
if ctx.Versioned() {
vctx, ok := ctx.(storage.VersionedCtx)
if !ok {
return nil, fmt.Errorf("Bad Get(): context is versioned but doesn't fulfill interface: %v", ctx)
}
// Get all versions of this key and return the most recent
// log.Printf(" basholeveldb versioned get of key %v\n", k)
values, err := db.getSingleKeyVersions(vctx, tk)
// log.Printf(" got back %v\n", values)
if err != nil {
return nil, err
}
kv, err := vctx.VersionedKeyValue(values)
// log.Printf(" after deversioning: %v\n", kv)
if kv != nil {
return kv.V, err
}
return nil, err
} else {
key := ctx.ConstructKey(tk)
ro := db.options.ReadOptions
// log.Printf(" basholeveldb unversioned get of key %v\n", key)
dvid.StartCgo()
v, err := db.ldb.Get(ro, key)
dvid.StopCgo()
storage.StoreValueBytesRead <- len(v)
return v, err
}
}
// Delete removes a value with given key.
func (db *KVAutobus) Delete(ctx storage.Context, tk storage.TKey) error {
if ctx == nil {
return fmt.Errorf("Received nil context in Delete()")
}
key := ctx.ConstructKey(tk)
return db.RawDelete(key)
}
// Put writes a value with given key.
func (db *LevelDB) Put(ctx storage.Context, tk storage.TKey, v []byte) error {
if ctx == nil {
return fmt.Errorf("Received nil context in Put()")
}
wo := db.options.WriteOptions
var err error
key := ctx.ConstructKey(tk)
if !ctx.Versioned() {
dvid.StartCgo()
err = db.ldb.Put(wo, key, v)
dvid.StopCgo()
} else {
vctx, ok := ctx.(storage.VersionedCtx)
if !ok {
return fmt.Errorf("Non-versioned context that says it's versioned received in Put(): %v", ctx)
}
tombstoneKey := vctx.TombstoneKey(tk)
batch := db.NewBatch(vctx).(*goBatch)
batch.WriteBatch.Delete(tombstoneKey)
batch.WriteBatch.Put(key, v)
if err = batch.Commit(); err != nil {
batch.Close()
err = fmt.Errorf("Error on PUT: %v\n", err)
}
}
storage.StoreKeyBytesWritten <- len(key)
storage.StoreValueBytesWritten <- len(v)
return err
}
// SendKeysInRange sends a range of keys spanning (kStart, kEnd). Values
// associated with the keys are not read. If the keys are versioned, only keys
// in the ancestor path of the current context's version will be returned.
// End of range is marked by a nil key.
func (db *LevelDB) SendKeysInRange(ctx storage.Context, kStart, kEnd storage.TKey, kch storage.KeyChan) error {
if db == nil {
return fmt.Errorf("Can't call SendKeysInRange on nil LevelDB")
}
if ctx == nil {
return fmt.Errorf("Received nil context in SendKeysInRange()")
}
ch := make(chan errorableKV)
done := make(chan struct{})
defer close(done)
// Run the range query on a potentially versioned key in a goroutine.
go func() {
if !ctx.Versioned() {
db.unversionedRange(ctx, kStart, kEnd, ch, done, true)
} else {
db.versionedRange(ctx.(storage.VersionedCtx), kStart, kEnd, ch, done, true)
}
}()
// Consume the keys.
for {
result := <-ch
if result.KeyValue == nil {
kch <- nil
return nil
}
if result.error != nil {
kch <- nil
return result.error
}
kch <- result.KeyValue.K
}
}
// Delete removes a value with given key.
func (db *LevelDB) Delete(ctx storage.Context, tk storage.TKey) error {
if db == nil {
return fmt.Errorf("Can't call Delete on nil LevelDB")
}
if ctx == nil {
return fmt.Errorf("Received nil context in Delete()")
}
wo := db.options.WriteOptions
var err error
key := ctx.ConstructKey(tk)
if !ctx.Versioned() {
dvid.StartCgo()
err = db.ldb.Delete(wo, key)
dvid.StopCgo()
} else {
vctx, ok := ctx.(storage.VersionedCtx)
if !ok {
return fmt.Errorf("Non-versioned context that says it's versioned received in Delete(): %v", ctx)
}
tombstoneKey := vctx.TombstoneKey(tk)
batch := db.NewBatch(vctx).(*goBatch)
batch.WriteBatch.Delete(key)
batch.WriteBatch.Put(tombstoneKey, dvid.EmptyValue())
if err = batch.Commit(); err != nil {
dvid.Criticalf("Error on batch commit of Delete: %v\n", err)
err = fmt.Errorf("Error on batch commit of Delete: %v", err)
}
}
return err
}
// KeysInRange returns a range of present keys spanning (kStart, kEnd). Values
// associated with the keys are not read. If the keys are versioned, only keys
// in the ancestor path of the current context's version will be returned.
func (db *LevelDB) KeysInRange(ctx storage.Context, kStart, kEnd storage.TKey) ([]storage.TKey, error) {
if db == nil {
return nil, fmt.Errorf("Can't call KeysInRange on nil LevelDB")
}
if ctx == nil {
return nil, fmt.Errorf("Received nil context in KeysInRange()")
}
ch := make(chan errorableKV)
// Run the range query on a potentially versioned key in a goroutine.
go func() {
if !ctx.Versioned() {
db.unversionedRange(ctx, kStart, kEnd, ch, true)
} else {
db.versionedRange(ctx.(storage.VersionedCtx), kStart, kEnd, ch, true)
}
}()
// Consume the keys.
values := []storage.TKey{}
for {
result := <-ch
if result.KeyValue == nil {
return values, nil
}
if result.error != nil {
return nil, result.error
}
tk, err := ctx.TKeyFromKey(result.KeyValue.K)
if err != nil {
return nil, err
}
values = append(values, tk)
}
}
// Put key-value pairs. Note that it could be more efficient to use the Batcher
// interface so you don't have to create and keep a slice of KeyValue. Some
// databases like leveldb will copy on batch put anyway.
func (db *BigTable) PutRange(ctx storage.Context, TKeyValue []storage.TKeyValue) error {
if db == nil {
return fmt.Errorf("Can't call PutRange() on nil BigTable")
}
if ctx == nil {
return fmt.Errorf("Received nil context in PutRange()")
}
for _, tkeyvalue := range TKeyValue {
unvKey, verKey, err := ctx.SplitKey(tkeyvalue.K)
if err != nil {
dvid.Errorf("Error in PutRange(): %v\n", err)
}
mut := api.NewMutation()
mut.Set(familyName, encodeKey(verKey), 0, tkeyvalue.V)
err = tbl.Apply(db.ctx, encodeKey(unvKey), mut)
if err != nil {
dvid.Errorf("Failed to Put value in PutRange()")
}
}
return nil
}
// DeleteRange removes all key-value pairs with keys in the given range.
func (db *LevelDB) DeleteRange(ctx storage.Context, kStart, kEnd storage.TKey) error {
if ctx == nil {
return fmt.Errorf("Received nil context in DeleteRange()")
}
// For leveldb, we just iterate over keys in range and delete each one using batch.
const BATCH_SIZE = 10000
batch := db.NewBatch(ctx).(*goBatch)
ch := make(chan errorableKV)
// Run the keys-only range query in a goroutine.
go func() {
if ctx == nil || !ctx.Versioned() {
db.unversionedRange(ctx, kStart, kEnd, ch, true)
} else {
db.versionedRange(ctx.(storage.VersionedCtx), kStart, kEnd, ch, true)
}
}()
// Consume the key-value pairs.
numKV := 0
for {
result := <-ch
if result.KeyValue == nil {
break
}
if result.error != nil {
return result.error
}
// The key coming down channel is not index but full key, so no need to construct key using context.
// If versioned, write a tombstone using current version id since we don't want to delete locked ancestors.
// If unversioned, just delete.
tk, err := ctx.TKeyFromKey(result.KeyValue.K)
if err != nil {
return err
}
batch.Delete(tk)
if (numKV+1)%BATCH_SIZE == 0 {
if err := batch.Commit(); err != nil {
batch.Close()
return fmt.Errorf("Error on batch DELETE at key-value pair %d: %v\n", numKV, err)
}
batch = db.NewBatch(ctx).(*goBatch)
}
numKV++
}
if numKV%BATCH_SIZE != 0 {
if err := batch.Commit(); err != nil {
batch.Close()
return fmt.Errorf("Error on last batch DELETE: %v\n", err)
}
}
dvid.Debugf("Deleted %d key-value pairs via delete range for %s.\n", numKV, ctx)
return nil
}
// GetTileKey returns the internal key as a hexadecimal string
func (d *Data) GetTileKey(ctx storage.Context, w http.ResponseWriter, r *http.Request, parts []string) (string, error) {
req, err := d.ParseTileReq(r, parts)
if err != nil {
return "", err
}
tk := NewTKeyByTileReq(req)
key := ctx.ConstructKey(tk)
return fmt.Sprintf("%x", key), nil
}
// PutRange puts type key-value pairs that have been sorted in sequential key order.
func (db *KVAutobus) PutRange(ctx storage.Context, tkvs []storage.TKeyValue) error {
if ctx == nil {
return fmt.Errorf("Received nil context in PutRange()")
}
kvs := make([]storage.KeyValue, len(tkvs))
for i, tkv := range tkvs {
kvs[i] = storage.KeyValue{ctx.ConstructKey(tkv.K), tkv.V}
}
return db.putRange(kvs)
}
// DeleteAll deletes all key-value associated with a context (data instance and version).
func (db *KVAutobus) DeleteAll(ctx storage.Context, allVersions bool) error {
if ctx == nil {
return fmt.Errorf("Received nil context in DeleteAll()")
}
if !allVersions {
return fmt.Errorf("DeleteAll() not supported for immutable store unless for all versions")
}
keyBeg, keyEnd := ctx.KeyRange()
return db.deleteRange(keyBeg, keyEnd)
}
// KeysInRange returns a range of type-specific key components spanning (TkBeg, TkEnd).
func (db *BigTable) KeysInRange(ctx storage.Context, TkBeg, TkEnd storage.TKey) ([]storage.TKey, error) {
if db == nil {
return nil, fmt.Errorf("Can't call KeysInRange() on nil BigTable")
}
if ctx == nil {
return nil, fmt.Errorf("Received nil context in KeysInRange()")
}
tKeys := make([]storage.TKey, 0)
unvKeyBeg, _, err := ctx.SplitKey(TkBeg)
if err != nil {
dvid.Errorf("Error in KeysInRange(): %v\n", err)
}
unvKeyEnd, _, err := ctx.SplitKey(TkEnd)
if err != nil {
dvid.Errorf("Error in KeysInRange(): %v\n", err)
}
rr := api.NewRange(encodeKey(unvKeyBeg), encodeKey(unvKeyEnd))
err = tbl.ReadRows(db.ctx, rr, func(r api.Row) bool {
if len(r[familyName]) == 0 {
dvid.Errorf("Error in KeysInRange(): row has no columns")
return false
}
unvKeyRow, err := decodeKey(r.Key())
if err != nil {
dvid.Errorf("Error in KeysInRange(): %v\n", err)
return false
}
verKeyRow, err := decodeKey(r[familyName][0].Column)
if err != nil {
dvid.Errorf("Error in KeysInRange(): %v\n", err)
return false
}
fullKey := storage.MergeKey(unvKeyRow, verKeyRow)
tkey, err := storage.TKeyFromKey(fullKey)
if err != nil {
dvid.Errorf("Error in KeysInRange(): %v\n", err)
return false
}
tKeys = append(tKeys, tkey)
return true // keep going
}, api.RowFilter(api.StripValueFilter()))
return tKeys, err
}
// GetRange returns a range of values spanning (TkBeg, kEnd) keys.
func (db *BigTable) GetRange(ctx storage.Context, TkBeg, TkEnd storage.TKey) ([]*storage.TKeyValue, error) {
if db == nil {
return nil, fmt.Errorf("Can't call GetRange() on nil BigTable")
}
if ctx == nil {
return nil, fmt.Errorf("Received nil context in GetRange()")
}
unvKeyBeg, _, err := ctx.SplitKey(TkBeg)
if err != nil {
dvid.Errorf("Error in GetRange(): %v\n", err)
}
unvKeyEnd, _, err := ctx.SplitKey(TkEnd)
if err != nil {
dvid.Errorf("Error in GetRange(): %v\n", err)
}
tKeyValues := make([]*storage.TKeyValue, 0)
rr := api.NewRange(encodeKey(unvKeyBeg), encodeKey(unvKeyEnd))
err = tbl.ReadRows(db.ctx, rr, func(r api.Row) bool {
unvKeyRow, err := decodeKey(r.Key())
if err != nil {
dvid.Errorf("Error in GetRange() decodeKey(r.Key()): %v\n", err)
return false
}
// dvid.Infof("GetRange() with row key= %v", r.Key())
for _, readItem := range r[familyName] {
verKey, err := decodeKey(readItem.Column)
if err != nil {
dvid.Errorf("Error in GetRange() decodeKey(readItem.Column): %v\n", err)
return false
}
fullKey := storage.MergeKey(unvKeyRow, verKey)
// dvid.Infof("colum key= %v , timestamp = %v", verKey, readItem.Timestamp)
tkey, err := storage.TKeyFromKey(fullKey)
if err != nil {
dvid.Errorf("Error in GetRange() storage.TKeyFromKey(fullKey): %v\n", err)
return false
}
kv := storage.TKeyValue{tkey, readItem.Value}
tKeyValues = append(tKeyValues, &kv)
}
return true // keep going
})
return tKeyValues, err
}
// Put writes a value with given key. Since KVAutobus is immutable, we do not
// have to worry about a PUT on a previously deleted key.
func (db *KVAutobus) Put(ctx storage.Context, tk storage.TKey, v []byte) error {
if ctx == nil {
return fmt.Errorf("Received nil context in Put()")
}
key := ctx.ConstructKey(tk)
err := db.RawPut(key, v)
if err != nil {
return err
}
return nil
}
// unversionedRange sends a range of key-value pairs down a channel.
func (db *LevelDB) unversionedRange(ctx storage.Context, begTKey, endTKey storage.TKey, ch chan errorableKV, done <-chan struct{}, keysOnly bool) {
dvid.StartCgo()
ro := levigo.NewReadOptions()
it := db.ldb.NewIterator(ro)
defer func() {
it.Close()
dvid.StopCgo()
}()
// Apply context if applicable
begKey := ctx.ConstructKey(begTKey)
endKey := ctx.ConstructKey(endTKey)
// fmt.Printf("unversionedRange():\n")
// fmt.Printf(" index beg: %v\n", kStart)
// fmt.Printf(" index end: %v\n", kEnd)
// fmt.Printf(" key start: %v\n", keyBeg)
// fmt.Printf(" key end: %v\n", keyEnd)
var itValue []byte
it.Seek(begKey)
for {
if it.Valid() {
// fmt.Printf("unversioned found key %v, %d bytes value\n", it.Key(), len(it.Value()))
if !keysOnly {
itValue = it.Value()
storage.StoreValueBytesRead <- len(itValue)
}
itKey := it.Key()
storage.StoreKeyBytesRead <- len(itKey)
// Did we pass the final key?
if bytes.Compare(itKey, endKey) > 0 {
break
}
select {
case <-done:
ch <- errorableKV{nil, nil}
return
case ch <- errorableKV{&storage.KeyValue{K: itKey, V: itValue}, nil}:
it.Next()
}
} else {
break
}
}
if err := it.GetError(); err != nil {
ch <- errorableKV{nil, err}
} else {
ch <- errorableKV{nil, nil}
}
return
}
// unversionedRange sends a range of key-value pairs down a channel.
func (db *KVAutobus) unversionedRange(ctx storage.Context, kStart, kEnd storage.TKey, ch chan errorableKV, keysOnly bool) {
keyBeg := ctx.ConstructKey(kStart)
keyEnd := ctx.ConstructKey(kEnd)
kvs, err := db.getRange(ctx, keyBeg, keyEnd)
if err != nil {
ch <- errorableKV{nil, err}
}
for _, kv := range kvs {
ch <- errorableKV{kv, nil}
}
ch <- errorableKV{nil, nil}
}
// Put writes a value with given key. Since KVAutobus is immutable, we do not
// have to worry about a PUT on a previously deleted key.
func (db *KVAutobus) Put(ctx storage.Context, tk storage.TKey, v []byte) error {
if ctx == nil {
return fmt.Errorf("Received nil context in Put()")
}
key := ctx.ConstructKey(tk)
err := db.RawPut(key, v)
if err != nil {
return err
}
storage.StoreKeyBytesWritten <- len(key)
storage.StoreValueBytesWritten <- len(v)
return nil
}
// SendKeysInRange sends a range of full keys down a key channel.
func (db *BigTable) SendKeysInRange(ctx storage.Context, TkBeg, TkEnd storage.TKey, ch storage.KeyChan) error {
if db == nil {
return fmt.Errorf("Can't call SendKeysInRange() on nil BigTable")
}
if ctx == nil {
return fmt.Errorf("Received nil context in SendKeysInRange()")
}
unvKeyBeg, _, err := ctx.SplitKey(TkBeg)
if err != nil {
dvid.Errorf("Error in SendKeysInRange(): %v\n", err)
}
unvKeyEnd, _, err := ctx.SplitKey(TkEnd)
if err != nil {
dvid.Errorf("Error in SendKeysInRange(): %v\n", err)
}
rr := api.NewRange(encodeKey(unvKeyBeg), encodeKey(unvKeyEnd))
err = tbl.ReadRows(db.ctx, rr, func(r api.Row) bool {
unvKeyRow, err := decodeKey(r.Key())
if err != nil {
dvid.Errorf("Error in SendKeysInRange(): %v\n", err)
return false
}
//I need the versioned key to merged it with the unversioned
// and send it throu the channel
for _, readItem := range r[familyName] {
verKey, err := decodeKey(readItem.Column)
if err != nil {
dvid.Errorf("Error in SendKeysInRange(): %v\n", err)
return false
}
fullKey := storage.MergeKey(unvKeyRow, verKey)
ch <- fullKey
}
return true // keep going
}, api.RowFilter(api.StripValueFilter()))
return err
}
// Delete deletes a key-value pair so that subsequent Get on the key returns nil.
func (db *BigTable) Delete(ctx storage.Context, tkey storage.TKey) error {
if db == nil {
return fmt.Errorf("Can't call Delete() on nil BigTable")
}
if ctx == nil {
return fmt.Errorf("Received nil context in Delete()")
}
unvKey, verKey, err := ctx.SplitKey(tkey)
if err != nil {
dvid.Errorf("Error in Delete(): %v\n", err)
}
r, err := tbl.ReadRow(db.ctx, encodeKey(unvKey), api.RowFilter(api.StripValueFilter()))
//A missing row will return a zero-length map and a nil error
if len(r) == 0 {
return fmt.Errorf("Error in Delete(): This unvKey doesn't exists")
}
if err != nil {
return err
}
if len(r[familyName]) == 0 {
return fmt.Errorf("Error in Delete(): This row is empty")
}
_, err = getValue(r, verKey)
if err != nil {
return fmt.Errorf("Error in Delete(): The version to be deleted doesn't exist")
}
mut := api.NewMutation()
//There is only one version left, and is the one we are trying to delete\
//remove the whole row
if len(r[familyName]) == 1 {
mut.DeleteRow()
} else {
mut.DeleteCellsInColumn(familyName, encodeKey(verKey))
}
err = tbl.Apply(db.ctx, encodeKey(unvKey), mut)
if err != nil {
return fmt.Errorf("Error in Delete(): %v\n", err)
}
return err
}
// unversionedRange sends a range of key-value pairs down a channel.
func (db *KVAutobus) unversionedRange(ctx storage.Context, kStart, kEnd storage.TKey, ch chan errorableKV, keysOnly bool) {
keyBeg := ctx.ConstructKey(kStart)
keyEnd := ctx.ConstructKey(kEnd)
kvs, err := db.getRange(keyBeg, keyEnd)
if err != nil {
ch <- errorableKV{nil, err}
}
for _, kv := range kvs {
if !keysOnly {
storage.StoreValueBytesRead <- len(kv.V)
}
storage.StoreKeyBytesRead <- len(kv.K)
ch <- errorableKV{kv, nil}
}
ch <- errorableKV{nil, nil}
return
}
// ProcessRange sends a range of key-value pairs to chunk handlers. If the keys are versioned,
// only key-value pairs for kStart's version will be transmitted. If f returns an error, the
// function is immediately terminated and returns an error.
func (db *LevelDB) ProcessRange(ctx storage.Context, kStart, kEnd storage.TKey, op *storage.ChunkOp, f storage.ChunkFunc) error {
if db == nil {
return fmt.Errorf("Can't call ProcessRange on nil LevelDB")
}
if ctx == nil {
return fmt.Errorf("Received nil context in ProcessRange()")
}
ch := make(chan errorableKV)
done := make(chan struct{})
defer close(done)
// Run the range query on a potentially versioned key in a goroutine.
go func() {
if ctx == nil || !ctx.Versioned() {
db.unversionedRange(ctx, kStart, kEnd, ch, done, false)
} else {
db.versionedRange(ctx.(storage.VersionedCtx), kStart, kEnd, ch, done, false)
}
}()
// Consume the key-value pairs.
for {
result := <-ch
if result.KeyValue == nil {
return nil
}
if result.error != nil {
return result.error
}
if op != nil && op.Wg != nil {
op.Wg.Add(1)
}
tk, err := storage.TKeyFromKey(result.KeyValue.K)
if err != nil {
return err
}
tkv := storage.TKeyValue{tk, result.KeyValue.V}
chunk := &storage.Chunk{op, &tkv}
if err := f(chunk); err != nil {
return err
}
}
}
// Get returns a value given a key.
func (db *KVAutobus) Get(ctx storage.Context, tk storage.TKey) ([]byte, error) {
if ctx == nil {
return nil, fmt.Errorf("Received nil context in Get()")
}
if ctx.Versioned() {
vctx, ok := ctx.(storage.VersionedCtx)
if !ok {
return nil, fmt.Errorf("Bad Get(): context is versioned but doesn't fulfill interface: %v", ctx)
}
// Get all versions of this key and return the most recent
// log.Printf(" kvautobus versioned get of key %v\n", k)
key := ctx.ConstructKey(tk)
dvid.Infof(" Get on key: %s\n", hex.EncodeToString(key))
values, err := db.getSingleKeyVersions(vctx, tk)
// log.Printf(" got back %v\n", values)
if err != nil {
return nil, err
}
kv, err := vctx.VersionedKeyValue(values)
// log.Printf(" after deversioning: %v\n", kv)
if kv != nil {
return kv.V, err
}
return nil, err
} else {
key := ctx.ConstructKey(tk)
// log.Printf(" kvautobus unversioned get of key %v\n", key)
v, err := db.RawGet(key)
storage.StoreValueBytesRead <- len(v)
return v, err
}
}
// DeleteRange removes all key-value pairs with keys in the given range.
// For all versions
func (db *BigTable) DeleteRange(ctx storage.Context, TkBeg, TkEnd storage.TKey) error {
if db == nil {
return fmt.Errorf("Can't call DeleteRange() on nil BigTable")
}
if ctx == nil {
return fmt.Errorf("Received nil context in DeleteRange()")
}
unvKeyBeg, _, err := ctx.SplitKey(TkBeg)
if err != nil {
return fmt.Errorf("Error in DeleteRange(): %v\n", err)
}
unvKeyEnd, _, err := ctx.SplitKey(TkEnd)
if err != nil {
return fmt.Errorf("Error in DeleteRange(): %v\n", err)
}
rr := api.NewRange(encodeKey(unvKeyBeg), encodeKey(unvKeyEnd))
err = tbl.ReadRows(db.ctx, rr, func(r api.Row) bool {
unvKeyRow, err := decodeKey(r.Key())
if err != nil {
dvid.Errorf("Error in DeleteRange(): %v\n", err)
return false
}
mut := api.NewMutation()
mut.DeleteRow()
err = tbl.Apply(db.ctx, encodeKey(unvKeyRow), mut)
if err != nil {
dvid.Errorf("Failed to delete row in DeleteRange()")
}
return true // keep going
}, api.RowFilter(api.StripValueFilter()))
return err
}
// Put writes a value with given key in a possibly versioned context.
func (db *BigTable) Put(ctx storage.Context, tkey storage.TKey, value []byte) error {
if db == nil {
return fmt.Errorf("Can't call Put() on nil BigTable")
}
if ctx == nil {
return fmt.Errorf("Received nil context in Put()")
}
unvKey, verKey, err := ctx.SplitKey(tkey)
if err != nil {
dvid.Errorf("Error in Put(): %v\n", err)
}
mut := api.NewMutation()
// dvid.Infof("Putting value %s\n", string(value))
mut.Set(familyName, encodeKey(verKey), 0, value)
err = tbl.Apply(db.ctx, encodeKey(unvKey), mut)
if err != nil {
return fmt.Errorf("Error in Put(): %v\n", err)
}
return err
}
// DeleteRange removes all key-value pairs with keys in the given range. Versioned
// contexts cannot use immutable stores to delete ranges.
func (db *KVAutobus) DeleteRange(ctx storage.Context, kStart, kEnd storage.TKey) error {
if ctx == nil {
return fmt.Errorf("Received nil context in DeleteRange()")
}
if ctx.Versioned() {
return fmt.Errorf("DeleteRange() not supported for versioned contexts in immutable store")
}
keyBeg := ctx.ConstructKey(kStart)
keyEnd := ctx.ConstructKey(kEnd)
return db.deleteRange(keyBeg, keyEnd)
}
func (db *LevelDB) deleteAllVersions(ctx storage.Context) error {
dvid.StartCgo()
var err error
var minKey, maxKey storage.Key
vctx, versioned := ctx.(storage.VersionedCtx)
if versioned {
// Don't have to worry about tombstones. Delete all keys from all versions for this instance id.
minTKey := storage.MinTKey(storage.TKeyMinClass)
maxTKey := storage.MaxTKey(storage.TKeyMaxClass)
minKey, err = vctx.MinVersionKey(minTKey)
if err != nil {
return err
}
maxKey, err = vctx.MaxVersionKey(maxTKey)
if err != nil {
return err
}
} else {
minKey, maxKey = ctx.KeyRange()
}
const BATCH_SIZE = 10000
batch := db.NewBatch(ctx).(*goBatch)
ro := levigo.NewReadOptions()
it := db.ldb.NewIterator(ro)
defer func() {
it.Close()
dvid.StopCgo()
}()
numKV := 0
it.Seek(minKey)
for {
if err := it.GetError(); err != nil {
return fmt.Errorf("Error iterating during DeleteAll for %s: %v", ctx, err)
}
if it.Valid() {
itKey := it.Key()
storage.StoreKeyBytesRead <- len(itKey)
// Did we pass the final key?
if bytes.Compare(itKey, maxKey) > 0 {
break
}
batch.WriteBatch.Delete(itKey)
if (numKV+1)%BATCH_SIZE == 0 {
if err := batch.Commit(); err != nil {
dvid.Criticalf("Error on batch commit of DeleteAll at key-value pair %d: %v\n", numKV, err)
return fmt.Errorf("Error on batch commit of DeleteAll at key-value pair %d: %v", numKV, err)
}
batch = db.NewBatch(ctx).(*goBatch)
dvid.Debugf("Deleted %d key-value pairs in ongoing DELETE ALL for %s.\n", numKV+1, ctx)
}
numKV++
it.Next()
} else {
break
}
}
if numKV%BATCH_SIZE != 0 {
if err := batch.Commit(); err != nil {
dvid.Criticalf("Error on last batch commit of DeleteAll: %v\n", err)
return fmt.Errorf("Error on last batch commit of DeleteAll: %v", err)
}
}
dvid.Debugf("Deleted %d key-value pairs via DELETE ALL for %s.\n", numKV, ctx)
return nil
}
// DeleteAll deletes all key-value associated with a context (data instance and version).
func (db *LevelDB) DeleteAll(ctx storage.Context, allVersions bool) error {
if ctx == nil {
return fmt.Errorf("Received nil context in Delete()")
}
dvid.StartCgo()
// Don't have to worry about tombstones. Delete all keys from all versions for this instance id.
minTKey := storage.MinTKey(storage.TKeyMinClass)
maxTKey := storage.MaxTKey(storage.TKeyMaxClass)
vctx, ok := ctx.(storage.VersionedCtx)
if !ok {
return fmt.Errorf("Non-versioned context passed to DELETE ALL VERSIONS in basholeveldb driver: %v", ctx)
}
minKey, err := vctx.MinVersionKey(minTKey)
if err != nil {
return err
}
maxKey, err := vctx.MaxVersionKey(maxTKey)
if err != nil {
return err
}
const BATCH_SIZE = 10000
batch := db.NewBatch(ctx).(*goBatch)
ro := levigo.NewReadOptions()
it := db.ldb.NewIterator(ro)
defer func() {
it.Close()
dvid.StopCgo()
}()
numKV := 0
it.Seek(minKey)
deleteVersion := ctx.VersionID()
for {
if it.Valid() {
itKey := it.Key()
storage.StoreKeyBytesRead <- len(itKey)
// Did we pass the final key?
if bytes.Compare(itKey, maxKey) > 0 {
break
}
if !allVersions {
_, v, _, err := storage.DataKeyToLocalIDs(itKey)
if err != nil {
return fmt.Errorf("Error on DELETE ALL for version %d: %v", ctx.VersionID(), err)
}
if v != deleteVersion {
it.Next()
continue
}
}
batch.WriteBatch.Delete(itKey)
if (numKV+1)%BATCH_SIZE == 0 {
if err := batch.Commit(); err != nil {
batch.Close()
return fmt.Errorf("Error on DELETE ALL at key-value pair %d: %v", numKV, err)
}
batch = db.NewBatch(ctx).(*goBatch)
}
numKV++
it.Next()
} else {
break
}
}
if numKV%BATCH_SIZE != 0 {
if err := batch.Commit(); err != nil {
batch.Close()
return fmt.Errorf("Error on last batch DELETE: %v\n", err)
}
}
dvid.Debugf("Deleted %d key-value pairs via DELETE ALL for %s.\n", numKV, ctx)
return nil
}
// DeleteAll removes all key-value pairs for the context. If allVersions is true,
// then all versions of the data instance are deleted.
func (db *BigTable) DeleteAll(ctx storage.Context, allVersions bool) error {
if db == nil {
return fmt.Errorf("Can't call DeleteAll() on nil BigTable")
}
if ctx == nil {
return fmt.Errorf("Received nil context in DeleteAll()")
}
//Row range corresponde to all keys corresponding to this data instace.
min, max := ctx.KeyRange()
rr := api.NewRange(encodeKey(min), encodeKey(max))
err := tbl.ReadRows(db.ctx, rr, func(r api.Row) bool {
unvKeyRow, err := decodeKey(r.Key())
if err != nil {
dvid.Errorf("Error in DeleteAll(): %v\n", err)
return false
}
if allVersions {
mut := api.NewMutation()
mut.DeleteRow()
err := tbl.Apply(db.ctx, encodeKey(unvKeyRow), mut)
if err != nil {
dvid.Errorf("Failed to delete row")
}
} else {
emptyTkey := make([]byte, 0)
_, versionToDelete, err := ctx.SplitKey(emptyTkey)
if err != nil {
dvid.Errorf("Error in DeleteAll(): %v\n", err)
return false
}
for _, readItem := range r[familyName] {
verKey, err := decodeKey(readItem.Column)
if err != nil {
dvid.Errorf("Error in DeleteAll(): %v\n", err)
return false
}
if bytes.Equal(verKey, versionToDelete) {
mut := api.NewMutation()
mut.DeleteCellsInColumn(familyName, encodeKey(verKey))
err := tbl.Apply(db.ctx, encodeKey(unvKeyRow), mut)
if err != nil {
dvid.Errorf("Failed to DeleteCellsInColumn in DeleteAll()")
}
return true // One I found the version I don't have to keep serching for it.
}
}
}
return true // keep going
}, api.RowFilter(api.StripValueFilter()))
return err
}
