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block.go
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block.go
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/*
Copyright SecureKey Technologies Inc. All Rights Reserved.
SPDX-License-Identifier: Apache-2.0
*/
// Package resource provides access to fabric network resource management, typically using system channel queries.
package resource
import (
reqContext "context"
"github.com/golang/protobuf/proto"
"github.com/hyperledger/fabric-protos-go/common"
ab "github.com/hyperledger/fabric-protos-go/orderer"
"github.com/huijinchain/fabric-sdk-go/pkg/common/errors/retry"
"github.com/huijinchain/fabric-sdk-go/pkg/common/providers/fab"
contextImpl "github.com/huijinchain/fabric-sdk-go/pkg/context"
ccomm "github.com/huijinchain/fabric-sdk-go/pkg/core/config/comm"
"github.com/huijinchain/fabric-sdk-go/pkg/fab/txn"
"github.com/pkg/errors"
)
// block retrieves the block at the given position
func retrieveBlock(reqCtx reqContext.Context, orderers []fab.Orderer, channel string, pos *ab.SeekPosition, opts options) (*common.Block, error) {
ctx, ok := contextImpl.RequestClientContext(reqCtx)
if !ok {
return nil, errors.New("failed get client context from reqContext for signPayload")
}
th, err := txn.NewHeader(ctx, channel)
if err != nil {
return nil, errors.Wrap(err, "generating TX ID failed")
}
hash, err := ccomm.TLSCertHash(ctx.EndpointConfig())
if err != nil {
return nil, errors.Wrapf(err, "failed to get tls cert hash")
}
channelHeaderOpts := txn.ChannelHeaderOpts{
TxnHeader: th,
TLSCertHash: hash,
}
seekInfoHeader, err := txn.CreateChannelHeader(common.HeaderType_DELIVER_SEEK_INFO, channelHeaderOpts)
if err != nil {
return nil, errors.Wrap(err, "CreateChannelHeader failed")
}
seekInfoHeaderBytes, err := proto.Marshal(seekInfoHeader)
if err != nil {
return nil, errors.Wrap(err, "marshal seek info failed")
}
signatureHeader, err := txn.CreateSignatureHeader(th)
if err != nil {
return nil, errors.Wrap(err, "CreateSignatureHeader failed")
}
signatureHeaderBytes, err := proto.Marshal(signatureHeader)
if err != nil {
return nil, errors.Wrap(err, "marshal signature header failed")
}
seekHeader := &common.Header{
ChannelHeader: seekInfoHeaderBytes,
SignatureHeader: signatureHeaderBytes,
}
seekInfo := &ab.SeekInfo{
Start: pos,
Stop: pos,
Behavior: ab.SeekInfo_BLOCK_UNTIL_READY,
}
seekInfoBytes, err := proto.Marshal(seekInfo)
if err != nil {
return nil, errors.Wrap(err, "marshal seek info failed")
}
payload := common.Payload{
Header: seekHeader,
Data: seekInfoBytes,
}
resp, err := retry.NewInvoker(retry.New(opts.retry)).Invoke(
func() (interface{}, error) {
return txn.SendPayload(reqCtx, &payload, orderers)
},
)
if err != nil {
return nil, err
}
return resp.(*common.Block), err
}
// newNewestSeekPosition returns a SeekPosition that requests the newest block
func newNewestSeekPosition() *ab.SeekPosition {
return &ab.SeekPosition{Type: &ab.SeekPosition_Newest{Newest: &ab.SeekNewest{}}}
}
// newSpecificSeekPosition returns a SeekPosition that requests the block at the given index
func newSpecificSeekPosition(index uint64) *ab.SeekPosition {
return &ab.SeekPosition{Type: &ab.SeekPosition_Specified{Specified: &ab.SeekSpecified{Number: index}}}
}