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  }