github.com/renegr87/renegr87@v2.1.1+incompatible/core/ledger/kvledger/txmgmt/statedb/statecouchdb/version_field_encoding.go (about) 1 /* 2 Copyright IBM Corp. All Rights Reserved. 3 4 SPDX-License-Identifier: Apache-2.0 5 */ 6 7 package statecouchdb 8 9 import ( 10 "encoding/base64" 11 12 "github.com/golang/protobuf/proto" 13 "github.com/hyperledger/fabric/core/ledger/kvledger/txmgmt/statedb/statecouchdb/msgs" 14 "github.com/hyperledger/fabric/core/ledger/kvledger/txmgmt/version" 15 "github.com/pkg/errors" 16 ) 17 18 func encodeVersionAndMetadata(version *version.Height, metadata []byte) (string, error) { 19 if version == nil { 20 return "", errors.New("nil version not supported") 21 } 22 msg := &msgs.VersionFieldProto{ 23 VersionBytes: version.ToBytes(), 24 Metadata: metadata, 25 } 26 msgBytes, err := proto.Marshal(msg) 27 if err != nil { 28 return "", err 29 } 30 return base64.StdEncoding.EncodeToString(msgBytes), nil 31 } 32 33 func decodeVersionAndMetadata(encodedstr string) (*version.Height, []byte, error) { 34 versionFieldBytes, err := base64.StdEncoding.DecodeString(encodedstr) 35 if err != nil { 36 return nil, nil, err 37 } 38 versionFieldMsg := &msgs.VersionFieldProto{} 39 if err = proto.Unmarshal(versionFieldBytes, versionFieldMsg); err != nil { 40 return nil, nil, err 41 } 42 ver, _, err := version.NewHeightFromBytes(versionFieldMsg.VersionBytes) 43 if err != nil { 44 return nil, nil, err 45 } 46 return ver, versionFieldMsg.Metadata, nil 47 }