func (self *hasherStruct) Perform(state *minos.OperationState) (
bucketReturn ares.Return) {
operation := state.Operation
instance, ret := self.createInstance(state)
if !ret.IsOk() {
return &bucket.ReturnGeneric{ret.GetStatus()}
}
switch operation.(type) {
case *operations.Put:
return instance.op_put(operation.(*operations.Put), state)
case *operations.Scan:
// Scan is disallowed for security reasons
return &bucket.ReturnGeneric{
Status: retcode.NewStatus(retcode.ErrorOperationNotSupported),
}
default:
// All other operations are forwarded
apiOperation := operations.Forwarded{
BucketId: instance.backendId,
Original: state.Operation,
}
apiReturn := state.Dispatcher.Perform(state.Context, &apiOperation)
return apiReturn
}
}
func (self *Store) Op_put(operation *operations.Put) (ret bucket.BucketReturn) {
leveldb, err := self.Database()
if err != nil {
return &bucket.ReturnGeneric{retcode.NewStatusError(retcode.ErrorServer, err)}
}
keyBytes := self.KeyToBytesAndPrefix(operation.Key)
// Success, now forward that thing (forwarding never fails)
if self.State.PutForwarder != nil && !self.DoNotPutForward {
self.State.PutForwarder.ForwardIfOk(operation)
}
var returnValue *operations.PutReturn
if operation.Value != nil {
valueBytes := operation.Value.Serialize()
//fmt.Printf("PUT: %v\n", keyBytes)
err = leveldb.Put(keyBytes, valueBytes, nil /*TODO*/)
if err != nil {
return &bucket.ReturnGeneric{retcode.NewStatusError(retcode.ErrorServer, err)}
}
returnValue = &operations.PutReturn{retcode.NewStatusOk()}
} else {
// Remove operation
err = leveldb.Delete(keyBytes, nil)
if err != nil {
return &bucket.ReturnGeneric{retcode.NewStatusError(retcode.ErrorServer, err)}
}
returnValue = &operations.PutReturn{retcode.NewStatus(retcode.OkRemove)}
}
return returnValue
}
func (self *notifierInstance) triggerSubscribers(operation *operations.Put,
keysToMatch types.Key,
matchChildKeys bool,
state *minos.OperationState) (ret bucket.BucketReturn) {
numberOfKeyElements := len(keysToMatch)
matchChildKeysByte := serializeMatchChildKey(matchChildKeys)
lookupKeyBegin := make(types.Key, numberOfKeyElements+3)
lookupKeyBegin[0] = []byte{matchChildKeysByte}
lookupKeyBegin[1] = []byte{byte(numberOfKeyElements)}
copy(lookupKeyBegin[2:], keysToMatch)
lookupKeyBegin[len(lookupKeyBegin)-1] = []byte{}
lookupKeyEnd := make(types.Key, numberOfKeyElements+3)
lookupKeyEnd[0] = []byte{matchChildKeysByte}
lookupKeyEnd[1] = []byte{byte(numberOfKeyElements)}
copy(lookupKeyEnd[2:], keysToMatch)
lookupKeyEnd[len(lookupKeyEnd)-1] = []byte{255}
is := new(iterateState)
is.opPut = operation
is.notificationReceiver = state.NotificationReceiver
is.id = state.BucketId
opIterate := &operations.Iterate{
BucketId: self.keysBucketId,
From: operations.Bound{
Key: lookupKeyBegin,
},
To: &operations.Bound{
Key: lookupKeyEnd,
},
Function: is.iterateFunction,
}
apiReturn := state.Dispatcher.Perform(state.Context, opIterate)
if !apiReturn.GetCode().IsOk() {
return &bucket.ReturnGeneric{apiReturn.GetStatus()}
}
if operation.Value != nil {
return &operations.PutReturn{retcode.NewStatusOk()}
} else {
return &operations.PutReturn{retcode.NewStatus(retcode.OkRemove)}
}
}
func (self *Store) Op_exists(operation *operations.Exists) (ret bucket.BucketReturn) {
database, err := self.Database()
if err != nil {
return &bucket.ReturnGeneric{retcode.NewStatusError(retcode.ErrorServer, err)}
}
keyBytes := self.KeyToBytesAndPrefix(operation.Key)
_, err = database.Get(keyBytes, nil)
if err == leveldb.ErrNotFound {
return &operations.ExistsReturn{retcode.NewStatus(retcode.OkNotFound)}
}
if err != nil {
return &bucket.ReturnGeneric{retcode.NewStatusError(retcode.ErrorServer, err)}
}
return &operations.ExistsReturn{
Status: retcode.NewStatusOk(),
}
}
func (self *blobstorePrototype) Perform(state *minos.OperationState) (
bucketReturn ares.Return) {
operation := state.Operation
instance, ret := self.createInstance(state)
if !ret.IsOk() {
return &bucket.ReturnGeneric{ret.GetStatus()}
}
switch operation.(type) {
case *operations.Put:
return instance.op_put(operation.(*operations.Put), state)
case *operations.Get:
return instance.op_get(operation.(*operations.Get), state)
default:
// No other operations are supported in this bucket type
return &bucket.ReturnGeneric{
Status: retcode.NewStatus(retcode.ErrorOperationNotSupported),
}
}
}
func (self *Store) Op_get(operation *operations.Get) (ret bucket.BucketReturn) {
database, err := self.Database()
if err != nil {
return &bucket.ReturnGeneric{retcode.NewStatusError(retcode.ErrorServer, err)}
}
keyBytes := self.KeyToBytesAndPrefix(operation.Key)
value, err := database.Get(keyBytes, nil)
if err == leveldb.ErrNotFound {
return &bucket.ReturnGeneric{retcode.NewStatus(retcode.OkNotFound)}
}
if err != nil {
return &bucket.ReturnGeneric{retcode.NewStatusError(retcode.ErrorServer, err)}
}
keyConstructed, err := types.NewArrayFromBytes(value)
if err != nil {
return &bucket.ReturnGeneric{retcode.NewStatusError(retcode.ErrorServer, err)}
}
return &operations.GetReturn{
Status: retcode.NewStatusOk(),
Value: keyConstructed,
}
}
func (self *hasherInstance) op_put(operation *operations.Put,
state *minos.OperationState) (ret bucket.BucketReturn) {
if operation.Value == nil {
// Removes are ignored
return &bucket.ReturnGeneric{retcode.NewStatus(retcode.ErrorOperationNotSupported)}
}
var firstElementHashBytes []byte
if operation.Hashes.FirstElementSha256Hash == nil {
theHasher := syshasher.NewHasher(operation.Value)
firstElementHashBytes = theHasher.FirstElement()
//TODO: Also forward alle elements hash
}
firstElementHash := hashes.FirstElementSha256Hash(firstElementHashBytes)
// Always forward a put with the generated hash as value, even if already exists
//TODO: Security problem if someone listens for such things?
putForward := operations.Put{
Key: operation.Key,
Value: types.Array{firstElementHashBytes},
Hashes: hashes.Hashes{
FirstElementSha256Hash: firstElementHash,
},
}
state.PutForwarder.ForwardIfOk(&putForward)
// Check if already exists
existsOperation := operations.Exists{
BucketId: self.backendId,
Key: types.Key{firstElementHashBytes},
}
apiExists := state.Dispatcher.Perform(state.Context, &existsOperation)
if apiExists.GetCode() == retcode.Ok {
// Already exists, end here
return &operations.PutReturn{retcode.NewStatus(retcode.OkAlreadyExists)}
}
if !apiExists.GetCode().IsOk() {
return &bucket.ReturnGeneric{retcode.NewStatusError(
apiExists.GetCode(),
errors.New("Unable to check if the entry already exists"))}
}
originalValue := operation.Value
var valueToSupply []byte
if len(originalValue) > 0 {
valueToSupply = originalValue[0]
} else {
// If there's no value, take empty bytes
valueToSupply = []byte{}
}
newPutOperation := operations.Put{
BucketId: self.backendId,
Key: types.Key{firstElementHashBytes},
// Only the first element survives
Value: types.Array{valueToSupply},
}
apiPerformRet := state.Dispatcher.Perform(state.Context, &newPutOperation)
if !apiPerformRet.GetCode().IsOk() {
return &bucket.ReturnGeneric{retcode.NewStatusError(
apiPerformRet.GetCode(),
errors.New("Unable to transfer the data to the backend bucket"))}
}
return &bucket.ReturnGeneric{retcode.NewStatusOk()}
}
