func (self *Store) Op_hash(operation *operations.Hash) (ret bucket.BucketReturn) {
opGet := operations.Get{
BucketId: operation.BucketId,
Key: operation.Key,
}
ret = self.Op_get(&opGet)
if !ret.GetCode().IsOk() {
// Error
return
}
if ret.GetCode() == retcode.OkNotFound {
// Not found, so we cannot hash it
return
}
// Ok, something we can hash
returnGet := ret.(*operations.GetReturn)
value := returnGet.Value
hasher := hasher.NewHasher(value)
hashreturn := new(operations.HashReturn)
hashreturn.FirstElementSha256Hash = hasher.FirstElement()
hashreturn.AllElementsSha256Hash = hasher.AllElements()
hashreturn.Status = retcode.NewStatusOk()
return hashreturn
}
func fillMissingHashesAccordingToConfig(returnConfig *operations.ReturnConfig,
value types.Array,
hashes *hashes.Hashes) {
// Can only return hashes if value is available
if returnConfig.HashReturn && value != nil {
// Ok, need hashes
if hashes.AllElementsSha256Hash == nil ||
hashes.FirstElementSha256Hash == nil {
// Ok, hash is missing
hasher := hasher.NewHasher(value)
hashes.FirstElementSha256Hash = hasher.FirstElement()
hashes.AllElementsSha256Hash = hasher.AllElements()
}
}
}
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()}
}