92 lines
2.6 KiB
Go
92 lines
2.6 KiB
Go
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/*
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Copyright IBM Corp. 2016 All Rights Reserved.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package main
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import (
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"fmt"
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"github.com/golang/protobuf/proto"
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"github.com/hyperledger/fabric/core/chaincode/shim"
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"github.com/hyperledger/fabric/examples/chaincode/go/utxo/util"
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)
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// Store struct uses a chaincode stub for state access
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type Store struct {
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stub shim.ChaincodeStubInterface
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}
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// MakeChaincodeStore returns a store for storing keys in the state
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func MakeChaincodeStore(stub shim.ChaincodeStubInterface) util.Store {
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store := &Store{}
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store.stub = stub
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return store
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}
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func keyToString(key *util.Key) string {
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return key.TxHashAsHex + ":" + string(key.TxIndex)
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}
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// GetState returns the transaction for a given key
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func (s *Store) GetState(key util.Key) (*util.TX_TXOUT, bool, error) {
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keyToFetch := keyToString(&key)
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data, err := s.stub.GetState(keyToFetch)
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if err != nil {
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return nil, false, fmt.Errorf("Error getting state from stub: %s", err)
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}
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if data == nil {
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return nil, false, nil
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}
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// Value found, unmarshal
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var value = &util.TX_TXOUT{}
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err = proto.Unmarshal(data, value)
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if err != nil {
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return nil, false, fmt.Errorf("Error unmarshalling value: %s", err)
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}
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return value, true, nil
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}
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// DelState deletes the transaction for the given key
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func (s *Store) DelState(key util.Key) error {
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return s.stub.DelState(keyToString(&key))
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}
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// PutState stores the given transaction and key
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func (s *Store) PutState(key util.Key, value *util.TX_TXOUT) error {
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data, err := proto.Marshal(value)
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if err != nil {
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return fmt.Errorf("Error marshalling value to bytes: %s", err)
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}
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return s.stub.PutState(keyToString(&key), data)
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}
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// GetTran returns a transaction for the given hash
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func (s *Store) GetTran(key string) ([]byte, bool, error) {
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data, err := s.stub.GetState(key)
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if err != nil {
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return nil, false, fmt.Errorf("Error getting state from stub: %s", err)
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}
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if data == nil {
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return nil, false, nil
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}
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return data, true, nil
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}
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// PutTran adds a transaction to the state with the hash as a key
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func (s *Store) PutTran(key string, value []byte) error {
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return s.stub.PutState(key, value)
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}
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