github.com/darrenli6/fabric-sdk-example@v0.0.0-20220109053535-94b13b56df8c/events/producer/eventhelper.go (about)

     1  /*
     2  Copyright IBM Corp. 2016 All Rights Reserved.
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8  		 http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreed to in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  
    17  package producer
    18  
    19  import (
    20  	"fmt"
    21  
    22  	"github.com/hyperledger/fabric/protos/common"
    23  	pb "github.com/hyperledger/fabric/protos/peer"
    24  	"github.com/hyperledger/fabric/protos/utils"
    25  )
    26  
    27  // SendProducerBlockEvent sends block event to clients
    28  func SendProducerBlockEvent(block *common.Block) error {
    29  	bevent := &common.Block{}
    30  	bevent.Header = block.Header
    31  	bevent.Metadata = block.Metadata
    32  	bevent.Data = &common.BlockData{}
    33  	var channelID string
    34  	for _, d := range block.Data.Data {
    35  		ebytes := d
    36  		if ebytes != nil {
    37  			if env, err := utils.GetEnvelopeFromBlock(ebytes); err != nil {
    38  				logger.Errorf("error getting tx from block: %s", err)
    39  			} else if env != nil {
    40  				// get the payload from the envelope
    41  				payload, err := utils.GetPayload(env)
    42  				if err != nil {
    43  					return fmt.Errorf("could not extract payload from envelope: %s", err)
    44  				}
    45  
    46  				chdr, err := utils.UnmarshalChannelHeader(payload.Header.ChannelHeader)
    47  				if err != nil {
    48  					return err
    49  				}
    50  				channelID = chdr.ChannelId
    51  
    52  				if common.HeaderType(chdr.Type) == common.HeaderType_ENDORSER_TRANSACTION {
    53  					logger.Debugf("Channel [%s]: Block event for block number [%d] contains transaction id: %s", channelID, block.Header.Number, chdr.TxId)
    54  					tx, err := utils.GetTransaction(payload.Data)
    55  					if err != nil {
    56  						return fmt.Errorf("error unmarshalling transaction payload for block event: %s", err)
    57  					}
    58  					chaincodeActionPayload, err := utils.GetChaincodeActionPayload(tx.Actions[0].Payload)
    59  					if err != nil {
    60  						return fmt.Errorf("error unmarshalling transaction action payload for block event: %s", err)
    61  					}
    62  					propRespPayload, err := utils.GetProposalResponsePayload(chaincodeActionPayload.Action.ProposalResponsePayload)
    63  					if err != nil {
    64  						return fmt.Errorf("error unmarshalling proposal response payload for block event: %s", err)
    65  					}
    66  					//ENDORSER_ACTION, ProposalResponsePayload.Extension field contains ChaincodeAction
    67  					caPayload, err := utils.GetChaincodeAction(propRespPayload.Extension)
    68  					if err != nil {
    69  						return fmt.Errorf("error unmarshalling chaincode action for block event: %s", err)
    70  					}
    71  					// Drop read write set from transaction before sending block event
    72  					// Performance issue with chaincode deploy txs and causes nodejs grpc
    73  					// to hit max message size bug
    74  					// Dropping the read write set may cause issues for security and
    75  					// we will need to revist when event security is addressed
    76  					caPayload.Results = nil
    77  					chaincodeActionPayload.Action.ProposalResponsePayload, err = utils.GetBytesProposalResponsePayload(propRespPayload.ProposalHash, caPayload.Response, caPayload.Results, caPayload.Events, caPayload.ChaincodeId)
    78  					if err != nil {
    79  						return fmt.Errorf("error marshalling tx proposal payload for block event: %s", err)
    80  					}
    81  					tx.Actions[0].Payload, err = utils.GetBytesChaincodeActionPayload(chaincodeActionPayload)
    82  					if err != nil {
    83  						return fmt.Errorf("error marshalling tx action payload for block event: %s", err)
    84  					}
    85  					payload.Data, err = utils.GetBytesTransaction(tx)
    86  					if err != nil {
    87  						return fmt.Errorf("error marshalling payload for block event: %s", err)
    88  					}
    89  					env.Payload, err = utils.GetBytesPayload(payload)
    90  					if err != nil {
    91  						return fmt.Errorf("error marshalling tx envelope for block event: %s", err)
    92  					}
    93  					ebytes, err = utils.GetBytesEnvelope(env)
    94  					if err != nil {
    95  						return fmt.Errorf("cannot marshal transaction: %s", err)
    96  					}
    97  				}
    98  			}
    99  		}
   100  		bevent.Data.Data = append(bevent.Data.Data, ebytes)
   101  	}
   102  
   103  	logger.Infof("Channel [%s]: Sending event for block number [%d]", channelID, block.Header.Number)
   104  
   105  	return Send(CreateBlockEvent(bevent))
   106  }
   107  
   108  //CreateBlockEvent creates a Event from a Block
   109  func CreateBlockEvent(te *common.Block) *pb.Event {
   110  	return &pb.Event{Event: &pb.Event_Block{Block: te}}
   111  }
   112  
   113  //CreateChaincodeEvent creates a Event from a ChaincodeEvent
   114  func CreateChaincodeEvent(te *pb.ChaincodeEvent) *pb.Event {
   115  	return &pb.Event{Event: &pb.Event_ChaincodeEvent{ChaincodeEvent: te}}
   116  }
   117  
   118  //CreateRejectionEvent creates an Event from TxResults
   119  func CreateRejectionEvent(tx *pb.Transaction, errorMsg string) *pb.Event {
   120  	return &pb.Event{Event: &pb.Event_Rejection{Rejection: &pb.Rejection{Tx: tx, ErrorMsg: errorMsg}}}
   121  }