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util.go
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/
util.go
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/*
Copyright IBM Corp. All Rights Reserved.
SPDX-License-Identifier: Apache-2.0
*/
package deliverclient
import (
"github.com/ZihuaZhang/fabric-protos-go/common"
"github.com/ZihuaZhang/fabric/common/configtx"
"github.com/ZihuaZhang/fabric/protoutil"
"github.com/pkg/errors"
)
var ErrNotAConfig = errors.New("not a config block")
// ConfigFromBlock returns a ConfigEnvelope if exists, or a *ErrNotAConfig error.
// It may also return some other error in case parsing failed.
func ConfigFromBlock(block *common.Block) (*common.ConfigEnvelope, error) {
if block == nil || block.Data == nil || len(block.Data.Data) == 0 {
return nil, errors.New("empty block")
}
txn := block.Data.Data[0]
env, err := protoutil.GetEnvelopeFromBlock(txn)
if err != nil {
return nil, errors.WithStack(err)
}
payload, err := protoutil.UnmarshalPayload(env.Payload)
if err != nil {
return nil, errors.WithStack(err)
}
if block.Header.Number == 0 {
configEnvelope, err := configtx.UnmarshalConfigEnvelope(payload.Data)
if err != nil {
return nil, errors.Wrap(err, "invalid config envelope")
}
return configEnvelope, nil
}
if payload.Header == nil {
return nil, errors.New("nil header in payload")
}
chdr, err := protoutil.UnmarshalChannelHeader(payload.Header.ChannelHeader)
if err != nil {
return nil, errors.WithStack(err)
}
if common.HeaderType(chdr.Type) != common.HeaderType_CONFIG {
return nil, ErrNotAConfig
}
configEnvelope, err := configtx.UnmarshalConfigEnvelope(payload.Data)
if err != nil {
return nil, errors.Wrap(err, "invalid config envelope")
}
return configEnvelope, nil
}