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client.go
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client.go
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/*
Copyright IBM Corp. All Rights Reserved.
SPDX-License-Identifier: Apache-2.0
*/
package tests
import (
"testing"
"github.com/golang/protobuf/proto"
"github.com/hyperledger/fabric/common/util"
"github.com/hyperledger/fabric/core/common/ccprovider"
"github.com/hyperledger/fabric/core/common/privdata"
"github.com/hyperledger/fabric/core/ledger"
"github.com/hyperledger/fabric/protos/common"
"github.com/hyperledger/fabric/protoutil"
"github.com/stretchr/testify/assert"
)
// client helps in a transction simulation. The client keeps accumlating the results of each simulated transaction
// in a slice and at a later stage can be used to cut a test block for committing.
// In a test, for each instantiated ledger, a single instance of a client is typically sufficient.
type client struct {
lgr ledger.PeerLedger
lgrID string
simulatedTrans []*txAndPvtdata // accumulates the results of transactions simulations
assert *assert.Assertions
}
func newClient(lgr ledger.PeerLedger, lgrID string, t *testing.T) *client {
return &client{lgr, lgrID, nil, assert.New(t)}
}
// simulateDataTx takes a simulation logic and wraps it between
// (A) the pre-simulation tasks (such as obtaining a fresh simulator) and
// (B) the post simulation tasks (such as gathering (public and pvt) simulation results and constructing a transaction)
// Since (A) and (B) both are handled in this function, the test code can be kept simple by just supplying the simulation logic
func (c *client) simulateDataTx(txid string, simulationLogic func(s *simulator)) *txAndPvtdata {
if txid == "" {
txid = util.GenerateUUID()
}
ledgerSimulator, err := c.lgr.NewTxSimulator(txid)
c.assert.NoError(err)
sim := &simulator{ledgerSimulator, txid, c.assert}
simulationLogic(sim)
txAndPvtdata := sim.done()
c.simulatedTrans = append(c.simulatedTrans, txAndPvtdata)
return txAndPvtdata
}
func (c *client) addPostOrderTx(txid string, customTxType common.HeaderType) *txAndPvtdata {
if txid == "" {
txid = util.GenerateUUID()
}
channelHeader := protoutil.MakeChannelHeader(customTxType, 0, c.lgrID, 0)
channelHeader.TxId = txid
paylBytes := protoutil.MarshalOrPanic(
&common.Payload{
Header: protoutil.MakePayloadHeader(channelHeader, &common.SignatureHeader{}),
Data: nil,
},
)
env := &common.Envelope{
Payload: paylBytes,
Signature: nil,
}
txAndPvtdata := &txAndPvtdata{Txid: txid, Envelope: env}
c.simulatedTrans = append(c.simulatedTrans, txAndPvtdata)
return txAndPvtdata
}
// simulateDeployTx mimics a transction that deploys a chaincode. This in turn calls the function 'simulateDataTx'
// with supplying the simulation logic that mimics the inoke funciton of 'lscc' for the ledger tests
func (c *client) simulateDeployTx(ccName string, collConfs []*collConf) *txAndPvtdata {
ccData := &ccprovider.ChaincodeData{Name: ccName}
ccDataBytes, err := proto.Marshal(ccData)
c.assert.NoError(err)
psudoLSCCInvokeFunc := func(s *simulator) {
s.setState("lscc", ccName, string(ccDataBytes))
if collConfs != nil {
protoBytes, err := convertToCollConfigProtoBytes(collConfs)
c.assert.NoError(err)
s.setState("lscc", privdata.BuildCollectionKVSKey(ccName), string(protoBytes))
}
}
return c.simulateDataTx("", psudoLSCCInvokeFunc)
}
// simulateUpgradeTx see comments on function 'simulateDeployTx'
func (c *client) simulateUpgradeTx(ccName string, collConfs []*collConf) *txAndPvtdata {
return c.simulateDeployTx(ccName, collConfs)
}
/////////////////////// simulator wrapper functions ///////////////////////
type simulator struct {
ledger.TxSimulator
txid string
assert *assert.Assertions
}
func (s *simulator) getState(ns, key string) string {
val, err := s.GetState(ns, key)
s.assert.NoError(err)
return string(val)
}
func (s *simulator) setState(ns, key string, val string) {
s.assert.NoError(
s.SetState(ns, key, []byte(val)),
)
}
func (s *simulator) setPvtdata(ns, coll, key string, val string) {
s.assert.NoError(
s.SetPrivateData(ns, coll, key, []byte(val)),
)
}
func (s *simulator) done() *txAndPvtdata {
s.Done()
simRes, err := s.GetTxSimulationResults()
s.assert.NoError(err)
pubRwsetBytes, err := simRes.GetPubSimulationBytes()
s.assert.NoError(err)
envelope, err := constructTransaction(s.txid, pubRwsetBytes)
s.assert.NoError(err)
txAndPvtdata := &txAndPvtdata{Txid: s.txid, Envelope: envelope, Pvtws: simRes.PvtSimulationResults}
return txAndPvtdata
}