forked from hyperledger/fabric-sdk-go
/
headertypefilter.go
executable file
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/
headertypefilter.go
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/*
Copyright SecureKey Technologies Inc. All Rights Reserved.
SPDX-License-Identifier: Apache-2.0
*/
package headertypefilter
import (
"github.com/hyperledger/fabric-sdk-go/pkg/common/logging"
"github.com/hyperledger/fabric-sdk-go/pkg/common/providers/fab"
cb "github.com/hyperledger/fabric-sdk-go/third_party/github.com/hyperledger/fabric/protos/common"
"github.com/hyperledger/fabric-sdk-go/third_party/github.com/hyperledger/fabric/protos/utils"
)
var logger = logging.NewLogger("eventservice/blockfilter")
// New returns a block filter that filters out blocks that
// don't contain envelopes of the given type(s)
func New(headerTypes ...cb.HeaderType) fab.BlockFilter {
return func(block *cb.Block) bool {
return hasType(block, headerTypes...)
}
}
func hasType(block *cb.Block, headerTypes ...cb.HeaderType) bool {
for i := 0; i < len(block.Data.Data); i++ {
env, err := utils.ExtractEnvelope(block, i)
if err != nil {
logger.Errorf("error extracting envelope from block: %s", err)
continue
}
payload, err := utils.ExtractPayload(env)
if err != nil {
logger.Errorf("error extracting payload from block: %s", err)
continue
}
chdr, err := utils.UnmarshalChannelHeader(payload.Header.ChannelHeader)
if err != nil {
logger.Errorf("error extracting channel header: %s", err)
continue
}
htype := cb.HeaderType(chdr.Type)
for _, headerType := range headerTypes {
if htype == headerType {
return true
}
}
}
return false
}