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proposal.go
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proposal.go
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/*
Copyright 2020 IBM All Rights Reserved.
SPDX-License-Identifier: Apache-2.0
*/
package client
import (
"context"
"fmt"
"github.com/golang/protobuf/proto"
"github.com/hyperledger/fabric-protos-go/gateway"
"google.golang.org/grpc"
)
// Proposal represents a transaction proposal that can be sent to peers for endorsement or evaluated as a query.
type Proposal struct {
client *gatewayClient
signingID *signingIdentity
channelID string
proposedTransaction *gateway.ProposedTransaction
}
// Bytes of the serialized proposal message.
func (proposal *Proposal) Bytes() ([]byte, error) {
transactionBytes, err := proto.Marshal(proposal.proposedTransaction)
if err != nil {
return nil, fmt.Errorf("failed to marshall Proposal protobuf: %w", err)
}
return transactionBytes, nil
}
// Digest of the proposal. This is used to generate a digital signature.
func (proposal *Proposal) Digest() []byte {
return proposal.signingID.Hash(proposal.proposedTransaction.Proposal.ProposalBytes)
}
// TransactionID for the proposal.
func (proposal *Proposal) TransactionID() string {
return proposal.proposedTransaction.GetTransactionId()
}
// Endorse the proposal and obtain an endorsed transaction for submission to the orderer.
func (proposal *Proposal) Endorse() (*Transaction, error) {
return proposal.endorse(proposal.client.Endorse)
}
// EndorseWithContext uses ths supplied context to endorse the proposal and obtain an endorsed transaction for
// submission to the orderer.
func (proposal *Proposal) EndorseWithContext(ctx context.Context) (*Transaction, error) {
return proposal.endorse(
func(in *gateway.EndorseRequest, opts ...grpc.CallOption) (*gateway.EndorseResponse, error) {
return proposal.client.EndorseWithContext(ctx, in, opts...)
},
)
}
func (proposal *Proposal) endorse(
call func(in *gateway.EndorseRequest, opts ...grpc.CallOption) (*gateway.EndorseResponse, error),
) (*Transaction, error) {
if err := proposal.sign(); err != nil {
return nil, err
}
endorseRequest := &gateway.EndorseRequest{
TransactionId: proposal.proposedTransaction.GetTransactionId(),
ChannelId: proposal.channelID,
ProposedTransaction: proposal.proposedTransaction.GetProposal(),
EndorsingOrganizations: proposal.proposedTransaction.GetEndorsingOrganizations(),
}
response, err := call(endorseRequest)
if err != nil {
return nil, err
}
preparedTransaction := &gateway.PreparedTransaction{
TransactionId: proposal.proposedTransaction.GetTransactionId(),
Envelope: response.GetPreparedTransaction(),
}
return newTransaction(proposal.client, proposal.signingID, preparedTransaction)
}
// Evaluate the proposal and obtain a transaction result. This is effectively a query.
func (proposal *Proposal) Evaluate() ([]byte, error) {
return proposal.evaluate(proposal.client.Evaluate)
}
// EvaluateWithContext uses ths supplied context to evaluate the proposal and obtain a transaction result. This is
// effectively a query.
func (proposal *Proposal) EvaluateWithContext(ctx context.Context) ([]byte, error) {
return proposal.evaluate(
func(in *gateway.EvaluateRequest, opts ...grpc.CallOption) (*gateway.EvaluateResponse, error) {
return proposal.client.EvaluateWithContext(ctx, in, opts...)
},
)
}
func (proposal *Proposal) evaluate(
call func(in *gateway.EvaluateRequest, opts ...grpc.CallOption) (*gateway.EvaluateResponse, error),
) ([]byte, error) {
if err := proposal.sign(); err != nil {
return nil, err
}
evaluateRequest := &gateway.EvaluateRequest{
TransactionId: proposal.proposedTransaction.GetTransactionId(),
ChannelId: proposal.channelID,
ProposedTransaction: proposal.proposedTransaction.GetProposal(),
TargetOrganizations: proposal.proposedTransaction.GetEndorsingOrganizations(),
}
response, err := call(evaluateRequest)
if err != nil {
return nil, err
}
return response.GetResult().GetPayload(), nil
}
func (proposal *Proposal) setSignature(signature []byte) {
proposal.proposedTransaction.Proposal.Signature = signature
}
func (proposal *Proposal) isSigned() bool {
return len(proposal.proposedTransaction.GetProposal().GetSignature()) > 0
}
func (proposal *Proposal) sign() error {
if proposal.isSigned() {
return nil
}
digest := proposal.Digest()
signature, err := proposal.signingID.Sign(digest)
if err != nil {
return err
}
proposal.setSignature(signature)
return nil
}