forked from hyperledger/fabric-sdk-go
/
txnhandler.go
299 lines (246 loc) · 9.8 KB
/
txnhandler.go
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/*
Copyright SecureKey Technologies Inc. All Rights Reserved.
SPDX-License-Identifier: Apache-2.0
*/
package invoke
import (
"bytes"
"github.com/hyperledger/fabric-sdk-go/pkg/common/errors/status"
"github.com/hyperledger/fabric-sdk-go/pkg/common/options"
"github.com/pkg/errors"
selectopts "github.com/hyperledger/fabric-sdk-go/pkg/client/common/selection/options"
"github.com/hyperledger/fabric-sdk-go/pkg/common/providers/fab"
"github.com/hyperledger/fabric-sdk-go/pkg/fab/peer"
"github.com/hyperledger/fabric-sdk-go/pkg/fab/txn"
"github.com/hyperledger/fabric-sdk-go/third_party/github.com/hyperledger/fabric/protos/common"
pb "github.com/hyperledger/fabric-sdk-go/third_party/github.com/hyperledger/fabric/protos/peer"
)
// TxnHeaderOptsProvider provides transaction header options which allow
// the provider to specify a custom creator and/or nonce.
type TxnHeaderOptsProvider func() []fab.TxnHeaderOpt
//EndorsementHandler for handling endorse transactions
type EndorsementHandler struct {
next Handler
headerOptsProvider TxnHeaderOptsProvider
}
//Handle for endorsing transactions
func (e *EndorsementHandler) Handle(requestContext *RequestContext, clientContext *ClientContext) {
if len(requestContext.Opts.Targets) == 0 {
requestContext.Error = status.New(status.ClientStatus, status.NoPeersFound.ToInt32(), "targets were not provided", nil)
return
}
// Endorse Tx
var TxnHeaderOpts []fab.TxnHeaderOpt
if e.headerOptsProvider != nil {
TxnHeaderOpts = e.headerOptsProvider()
}
transactionProposalResponses, proposal, err := createAndSendTransactionProposal(
clientContext.Transactor,
&requestContext.Request,
peer.PeersToTxnProcessors(requestContext.Opts.Targets),
TxnHeaderOpts...,
)
requestContext.Response.Proposal = proposal
requestContext.Response.TransactionID = proposal.TxnID // TODO: still needed?
if err != nil {
requestContext.Error = err
return
}
requestContext.Response.Responses = transactionProposalResponses
if len(transactionProposalResponses) > 0 {
requestContext.Response.Payload = transactionProposalResponses[0].ProposalResponse.GetResponse().Payload
requestContext.Response.ChaincodeStatus = transactionProposalResponses[0].ChaincodeStatus
}
//Delegate to next step if any
if e.next != nil {
e.next.Handle(requestContext, clientContext)
}
}
//ProposalProcessorHandler for selecting proposal processors
type ProposalProcessorHandler struct {
next Handler
}
//Handle selects proposal processors
func (h *ProposalProcessorHandler) Handle(requestContext *RequestContext, clientContext *ClientContext) {
//Get proposal processor, if not supplied then use selection service to get available peers as endorser
if len(requestContext.Opts.Targets) == 0 {
var selectionOpts []options.Opt
if requestContext.SelectionFilter != nil {
selectionOpts = append(selectionOpts, selectopts.WithPeerFilter(requestContext.SelectionFilter))
}
if requestContext.PeerSorter != nil {
selectionOpts = append(selectionOpts, selectopts.WithPeerSorter(requestContext.PeerSorter))
}
endorsers, err := clientContext.Selection.GetEndorsersForChaincode(newInvocationChain(requestContext), selectionOpts...)
if err != nil {
requestContext.Error = errors.WithMessage(err, "Failed to get endorsing peers")
return
}
requestContext.Opts.Targets = endorsers
}
//Delegate to next step if any
if h.next != nil {
h.next.Handle(requestContext, clientContext)
}
}
func newInvocationChain(requestContext *RequestContext) []*fab.ChaincodeCall {
invocChain := []*fab.ChaincodeCall{{ID: requestContext.Request.ChaincodeID}}
for _, ccCall := range requestContext.Request.InvocationChain {
if ccCall.ID == invocChain[0].ID {
invocChain[0].Collections = ccCall.Collections
} else {
invocChain = append(invocChain, ccCall)
}
}
return invocChain
}
//EndorsementValidationHandler for transaction proposal response filtering
type EndorsementValidationHandler struct {
next Handler
}
//Handle for Filtering proposal response
func (f *EndorsementValidationHandler) Handle(requestContext *RequestContext, clientContext *ClientContext) {
//Filter tx proposal responses
err := f.validate(requestContext.Response.Responses)
if err != nil {
requestContext.Error = errors.WithMessage(err, "endorsement validation failed")
return
}
//Delegate to next step if any
if f.next != nil {
f.next.Handle(requestContext, clientContext)
}
}
func (f *EndorsementValidationHandler) validate(txProposalResponse []*fab.TransactionProposalResponse) error {
var a1 *pb.ProposalResponse
for n, r := range txProposalResponse {
response := r.ProposalResponse.GetResponse()
if response.Status < int32(common.Status_SUCCESS) || response.Status >= int32(common.Status_BAD_REQUEST) {
return status.NewFromProposalResponse(r.ProposalResponse, r.Endorser)
}
if n == 0 {
a1 = r.ProposalResponse
continue
}
if !bytes.Equal(a1.Payload, r.ProposalResponse.Payload) ||
!bytes.Equal(a1.GetResponse().Payload, response.Payload) {
return status.New(status.EndorserClientStatus, status.EndorsementMismatch.ToInt32(),
"ProposalResponsePayloads do not match", nil)
}
}
return nil
}
//CommitTxHandler for committing transactions
type CommitTxHandler struct {
next Handler
}
//Handle handles commit tx
func (c *CommitTxHandler) Handle(requestContext *RequestContext, clientContext *ClientContext) {
txnID := requestContext.Response.TransactionID
//Register Tx event
reg, statusNotifier, err := clientContext.EventService.RegisterTxStatusEvent(string(txnID)) // TODO: Change func to use TransactionID instead of string
if err != nil {
requestContext.Error = errors.Wrap(err, "error registering for TxStatus event")
return
}
defer clientContext.EventService.Unregister(reg)
_, err = createAndSendTransaction(clientContext.Transactor, requestContext.Response.Proposal, requestContext.Response.Responses)
if err != nil {
requestContext.Error = errors.Wrap(err, "CreateAndSendTransaction failed")
return
}
select {
case txStatus := <-statusNotifier:
requestContext.Response.TxValidationCode = txStatus.TxValidationCode
if txStatus.TxValidationCode != pb.TxValidationCode_VALID {
requestContext.Error = status.New(status.EventServerStatus, int32(txStatus.TxValidationCode),
"received invalid transaction", nil)
return
}
case <-requestContext.Ctx.Done():
requestContext.Error = status.New(status.ClientStatus, status.Timeout.ToInt32(),
"Execute didn't receive block event", nil)
return
}
//Delegate to next step if any
if c.next != nil {
c.next.Handle(requestContext, clientContext)
}
}
//NewQueryHandler returns query handler with chain of ProposalProcessorHandler, EndorsementHandler, EndorsementValidationHandler and SignatureValidationHandler
func NewQueryHandler(next ...Handler) Handler {
return NewProposalProcessorHandler(
NewEndorsementHandler(
NewEndorsementValidationHandler(
NewSignatureValidationHandler(next...),
),
),
)
}
//NewExecuteHandler returns execute handler with chain of SelectAndEndorseHandler, EndorsementValidationHandler, SignatureValidationHandler and CommitHandler
func NewExecuteHandler(next ...Handler) Handler {
return NewSelectAndEndorseHandler(
NewEndorsementValidationHandler(
NewSignatureValidationHandler(NewCommitHandler(next...)),
),
)
}
//NewProposalProcessorHandler returns a handler that selects proposal processors
func NewProposalProcessorHandler(next ...Handler) *ProposalProcessorHandler {
return &ProposalProcessorHandler{next: getNext(next)}
}
//NewEndorsementHandler returns a handler that endorses a transaction proposal
func NewEndorsementHandler(next ...Handler) *EndorsementHandler {
return &EndorsementHandler{next: getNext(next)}
}
//NewEndorsementHandlerWithOpts returns a handler that endorses a transaction proposal
func NewEndorsementHandlerWithOpts(next Handler, provider TxnHeaderOptsProvider) *EndorsementHandler {
return &EndorsementHandler{next: next, headerOptsProvider: provider}
}
//NewEndorsementValidationHandler returns a handler that validates an endorsement
func NewEndorsementValidationHandler(next ...Handler) *EndorsementValidationHandler {
return &EndorsementValidationHandler{next: getNext(next)}
}
//NewCommitHandler returns a handler that commits transaction propsal responses
func NewCommitHandler(next ...Handler) *CommitTxHandler {
return &CommitTxHandler{next: getNext(next)}
}
func getNext(next []Handler) Handler {
if len(next) > 0 {
return next[0]
}
return nil
}
func createAndSendTransaction(sender fab.Sender, proposal *fab.TransactionProposal, resps []*fab.TransactionProposalResponse) (*fab.TransactionResponse, error) {
txnRequest := fab.TransactionRequest{
Proposal: proposal,
ProposalResponses: resps,
}
tx, err := sender.CreateTransaction(txnRequest)
if err != nil {
return nil, errors.WithMessage(err, "CreateTransaction failed")
}
transactionResponse, err := sender.SendTransaction(tx)
if err != nil {
return nil, errors.WithMessage(err, "SendTransaction failed")
}
return transactionResponse, nil
}
func createAndSendTransactionProposal(transactor fab.ProposalSender, chrequest *Request, targets []fab.ProposalProcessor, opts ...fab.TxnHeaderOpt) ([]*fab.TransactionProposalResponse, *fab.TransactionProposal, error) {
request := fab.ChaincodeInvokeRequest{
ChaincodeID: chrequest.ChaincodeID,
Fcn: chrequest.Fcn,
Args: chrequest.Args,
TransientMap: chrequest.TransientMap,
}
txh, err := transactor.CreateTransactionHeader(opts...)
if err != nil {
return nil, nil, errors.WithMessage(err, "creating transaction header failed")
}
proposal, err := txn.CreateChaincodeInvokeProposal(txh, request)
if err != nil {
return nil, nil, errors.WithMessage(err, "creating transaction proposal failed")
}
transactionProposalResponses, err := transactor.SendTransactionProposal(proposal, targets)
return transactionProposalResponses, proposal, err
}