/
handler.go
executable file
·1322 lines (1149 loc) · 52.1 KB
/
handler.go
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/*
Licensed to the Apache Software Foundation (ASF) under one
or more contributor license agreements. See the NOTICE file
distributed with this work for additional information
regarding copyright ownership. The ASF licenses this file
to you under the Apache License, Version 2.0 (the
"License"); you may not use this file except in compliance
with the License. You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing,
software distributed under the License is distributed on an
"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
KIND, either express or implied. See the License for the
specific language governing permissions and limitations
under the License.
*/
package chaincode
import (
"fmt"
"io"
"sync"
"time"
"github.com/golang/protobuf/proto"
"github.com/looplab/fsm"
"github.com/op/go-logging"
"github.com/openblockchain/obc-peer/openchain/crypto"
"github.com/openblockchain/obc-peer/openchain/ledger/statemgmt"
"github.com/openblockchain/obc-peer/openchain/util"
pb "github.com/openblockchain/obc-peer/protos"
"golang.org/x/net/context"
"github.com/openblockchain/obc-peer/openchain/ledger"
)
const (
createdstate = "created" //start state
establishedstate = "established" //in: CREATED, rcv: REGISTER, send: REGISTERED, INIT
initstate = "init" //in:ESTABLISHED, rcv:-, send: INIT
readystate = "ready" //in:ESTABLISHED,TRANSACTION, rcv:COMPLETED
transactionstate = "transaction" //in:READY, rcv: xact from consensus, send: TRANSACTION
busyinitstate = "busyinit" //in:INIT, rcv: PUT_STATE, DEL_STATE, INVOKE_CHAINCODE
busyxactstate = "busyxact" //in:TRANSACION, rcv: PUT_STATE, DEL_STATE, INVOKE_CHAINCODE
endstate = "end" //in:INIT,ESTABLISHED, rcv: error, terminate container
)
var chaincodeLogger = logging.MustGetLogger("chaincode")
// PeerChaincodeStream interface for stream between Peer and chaincode instance.
type PeerChaincodeStream interface {
Send(*pb.ChaincodeMessage) error
Recv() (*pb.ChaincodeMessage, error)
}
// MessageHandler interface for handling chaincode messages (common between Peer chaincode support and chaincode)
type MessageHandler interface {
HandleMessage(msg *pb.ChaincodeMessage) error
SendMessage(msg *pb.ChaincodeMessage) error
}
type transactionContext struct {
transactionSecContext *pb.Transaction
responseNotifier chan *pb.ChaincodeMessage
// tracks open iterators used for range queries
rangeQueryIteratorMap map[string]statemgmt.RangeScanIterator
}
type nextStateInfo struct {
msg *pb.ChaincodeMessage
sendToCC bool
}
// Handler responsbile for managment of Peer's side of chaincode stream
type Handler struct {
sync.RWMutex
ChatStream PeerChaincodeStream
FSM *fsm.FSM
ChaincodeID *pb.ChaincodeID
// A copy of decrypted deploy tx this handler manages, no code
deployTXSecContext *pb.Transaction
chaincodeSupport *ChaincodeSupport
registered bool
readyNotify chan bool
// Map of tx uuid to either invoke or query tx (decrypted). Each tx will be
// added prior to execute and remove when done execute
txCtxs map[string]*transactionContext
uuidMap map[string]bool
// Track which UUIDs are queries; Although the shim maintains this, it cannot be trusted.
isTransaction map[string]bool
// used to do Send after making sure the state transition is complete
nextState chan *nextStateInfo
}
func shortuuid(uuid string) string {
if len(uuid) < 8 {
return uuid
}
return uuid[0:8]
}
func (handler *Handler) serialSend(msg *pb.ChaincodeMessage) error {
handler.Lock()
defer handler.Unlock()
if err := handler.ChatStream.Send(msg); err != nil {
chaincodeLog.Error(fmt.Sprintf("Error sending %s: %s", msg.Type.String(), err))
return fmt.Errorf("Error sending %s: %s", msg.Type.String(), err)
}
return nil
}
func (handler *Handler) createTxContext(uuid string, tx *pb.Transaction) (*transactionContext, error) {
if handler.txCtxs == nil {
return nil, fmt.Errorf("cannot create notifier for Uuid:%s", uuid)
}
handler.Lock()
defer handler.Unlock()
if handler.txCtxs[uuid] != nil {
return nil, fmt.Errorf("Uuid:%s exists", uuid)
}
txctx := &transactionContext{transactionSecContext: tx, responseNotifier: make(chan *pb.ChaincodeMessage, 1),
rangeQueryIteratorMap: make(map[string]statemgmt.RangeScanIterator)}
handler.txCtxs[uuid] = txctx
return txctx, nil
}
func (handler *Handler) getTxContext(uuid string) *transactionContext {
handler.Lock()
defer handler.Unlock()
return handler.txCtxs[uuid]
}
func (handler *Handler) deleteTxContext(uuid string) {
handler.Lock()
defer handler.Unlock()
if handler.txCtxs != nil {
delete(handler.txCtxs, uuid)
}
}
func (handler *Handler) putRangeQueryIterator(txContext *transactionContext, uuid string,
rangeScanIterator statemgmt.RangeScanIterator) {
handler.Lock()
defer handler.Unlock()
txContext.rangeQueryIteratorMap[uuid] = rangeScanIterator
}
func (handler *Handler) getRangeQueryIterator(txContext *transactionContext, uuid string) statemgmt.RangeScanIterator {
handler.Lock()
defer handler.Unlock()
return txContext.rangeQueryIteratorMap[uuid]
}
func (handler *Handler) deleteRangeQueryIterator(txContext *transactionContext, uuid string) {
handler.Lock()
defer handler.Unlock()
delete(txContext.rangeQueryIteratorMap, uuid)
}
func (handler *Handler) encryptOrDecrypt(encrypt bool, uuid string, payload []byte) ([]byte, error) {
secHelper := handler.chaincodeSupport.getSecHelper()
if secHelper == nil {
return payload, nil
}
txctx := handler.getTxContext(uuid)
if txctx == nil {
return nil, fmt.Errorf("[%s]No context for uuid %s", shortuuid(uuid), uuid)
}
if txctx.transactionSecContext == nil {
return nil, fmt.Errorf("[%s]transaction context is nil for uuid %s", shortuuid(uuid), uuid)
}
var enc crypto.StateEncryptor
var err error
if txctx.transactionSecContext.Type == pb.Transaction_CHAINCODE_NEW {
if enc, err = secHelper.GetStateEncryptor(handler.deployTXSecContext, handler.deployTXSecContext); err != nil {
return nil, fmt.Errorf("error getting crypto encryptor for deploy tx :%s", err)
}
} else if txctx.transactionSecContext.Type == pb.Transaction_CHAINCODE_EXECUTE || txctx.transactionSecContext.Type == pb.Transaction_CHAINCODE_QUERY {
if enc, err = secHelper.GetStateEncryptor(handler.deployTXSecContext, txctx.transactionSecContext); err != nil {
return nil, fmt.Errorf("error getting crypto encryptor %s", err)
}
} else {
return nil, fmt.Errorf("invalid transaction type %s", txctx.transactionSecContext.Type.String())
}
if enc == nil {
return nil, fmt.Errorf("secure context returns nil encryptor for tx %s", uuid)
}
if chaincodeLogger.IsEnabledFor(logging.DEBUG) {
chaincodeLogger.Debug("[%s]Payload before encrypt/decrypt: %v", shortuuid(uuid), payload)
}
if encrypt {
payload, err = enc.Encrypt(payload)
} else {
payload, err = enc.Decrypt(payload)
}
if chaincodeLogger.IsEnabledFor(logging.DEBUG) {
chaincodeLogger.Debug("[%s]Payload after encrypt/decrypt: %v", shortuuid(uuid), payload)
}
return payload, err
}
func (handler *Handler) decrypt(uuid string, payload []byte) ([]byte, error) {
return handler.encryptOrDecrypt(false, uuid, payload)
}
func (handler *Handler) encrypt(uuid string, payload []byte) ([]byte, error) {
return handler.encryptOrDecrypt(true, uuid, payload)
}
func (handler *Handler) deregister() error {
if handler.registered {
handler.chaincodeSupport.deregisterHandler(handler)
}
return nil
}
func (handler *Handler) triggerNextState(msg *pb.ChaincodeMessage, send bool) {
handler.nextState <- &nextStateInfo{msg, send}
}
func (handler *Handler) processStream() error {
defer handler.deregister()
msgAvail := make(chan *pb.ChaincodeMessage)
var nsInfo *nextStateInfo
var in *pb.ChaincodeMessage
var err error
//recv is used to spin Recv routine after previous received msg
//has been processed
recv := true
for {
in = nil
err = nil
nsInfo = nil
if recv {
recv = false
go func() {
var in2 *pb.ChaincodeMessage
in2, err = handler.ChatStream.Recv()
msgAvail <- in2
}()
}
select {
case in = <-msgAvail:
// Defer the deregistering of the this handler.
if err == io.EOF {
chaincodeLogger.Debug("Received EOF, ending chaincode support stream, %s", err)
return err
} else if err != nil {
chaincodeLog.Error(fmt.Sprintf("Error handling chaincode support stream: %s", err))
return err
} else if in == nil {
err = fmt.Errorf("Received nil message, ending chaincode support stream")
chaincodeLogger.Debug("Received nil message, ending chaincode support stream")
return err
}
chaincodeLogger.Debug("[%s]Received message %s from shim", shortuuid(in.Uuid), in.Type.String())
if in.Type.String() == pb.ChaincodeMessage_ERROR.String() {
chaincodeLogger.Debug("Got error: %s", string(in.Payload))
}
// we can spin off another Recv again
recv = true
case nsInfo = <-handler.nextState:
in = nsInfo.msg
if in == nil {
err = fmt.Errorf("Next state nil message, ending chaincode support stream")
chaincodeLogger.Debug("Next state nil message, ending chaincode support stream")
return err
}
chaincodeLogger.Debug("[%s]Move state message %s", shortuuid(in.Uuid), in.Type.String())
}
err = handler.HandleMessage(in)
if err != nil {
chaincodeLog.Error(fmt.Sprintf("[%s]Error handling message, ending stream: %s", shortuuid(in.Uuid), err))
return fmt.Errorf("Error handling message, ending stream: %s", err)
}
if nsInfo != nil && nsInfo.sendToCC {
chaincodeLogger.Debug("[%s]sending state message %s", shortuuid(in.Uuid), in.Type.String())
if err = handler.serialSend(in); err != nil {
chaincodeLogger.Debug("[%s]serial sending received error %s", shortuuid(in.Uuid), err)
return fmt.Errorf("[%s]serial sending received error %s", shortuuid(in.Uuid), err)
}
}
}
}
// HandleChaincodeStream Main loop for handling the associated Chaincode stream
func HandleChaincodeStream(chaincodeSupport *ChaincodeSupport, stream pb.ChaincodeSupport_RegisterServer) error {
deadline, ok := stream.Context().Deadline()
chaincodeLogger.Debug("Current context deadline = %s, ok = %v", deadline, ok)
handler := newChaincodeSupportHandler(chaincodeSupport, stream)
return handler.processStream()
}
func newChaincodeSupportHandler(chaincodeSupport *ChaincodeSupport, peerChatStream PeerChaincodeStream) *Handler {
v := &Handler{
ChatStream: peerChatStream,
}
v.chaincodeSupport = chaincodeSupport
//we want this to block
v.nextState = make(chan *nextStateInfo)
v.FSM = fsm.NewFSM(
createdstate,
fsm.Events{
//Send REGISTERED, then, if deploy { trigger INIT(via INIT) } else { trigger READY(via COMPLETED) }
{Name: pb.ChaincodeMessage_REGISTER.String(), Src: []string{createdstate}, Dst: establishedstate},
{Name: pb.ChaincodeMessage_INIT.String(), Src: []string{establishedstate}, Dst: initstate},
{Name: pb.ChaincodeMessage_READY.String(), Src: []string{establishedstate}, Dst: readystate},
{Name: pb.ChaincodeMessage_TRANSACTION.String(), Src: []string{readystate}, Dst: transactionstate},
{Name: pb.ChaincodeMessage_PUT_STATE.String(), Src: []string{transactionstate}, Dst: busyxactstate},
{Name: pb.ChaincodeMessage_DEL_STATE.String(), Src: []string{transactionstate}, Dst: busyxactstate},
{Name: pb.ChaincodeMessage_INVOKE_CHAINCODE.String(), Src: []string{transactionstate}, Dst: busyxactstate},
{Name: pb.ChaincodeMessage_PUT_STATE.String(), Src: []string{initstate}, Dst: busyinitstate},
{Name: pb.ChaincodeMessage_DEL_STATE.String(), Src: []string{initstate}, Dst: busyinitstate},
{Name: pb.ChaincodeMessage_INVOKE_CHAINCODE.String(), Src: []string{initstate}, Dst: busyinitstate},
{Name: pb.ChaincodeMessage_COMPLETED.String(), Src: []string{initstate, readystate, transactionstate}, Dst: readystate},
{Name: pb.ChaincodeMessage_GET_STATE.String(), Src: []string{readystate}, Dst: readystate},
{Name: pb.ChaincodeMessage_GET_STATE.String(), Src: []string{initstate}, Dst: initstate},
{Name: pb.ChaincodeMessage_GET_STATE.String(), Src: []string{busyinitstate}, Dst: busyinitstate},
{Name: pb.ChaincodeMessage_GET_STATE.String(), Src: []string{transactionstate}, Dst: transactionstate},
{Name: pb.ChaincodeMessage_GET_STATE.String(), Src: []string{busyxactstate}, Dst: busyxactstate},
{Name: pb.ChaincodeMessage_RANGE_QUERY_STATE.String(), Src: []string{readystate}, Dst: readystate},
{Name: pb.ChaincodeMessage_RANGE_QUERY_STATE.String(), Src: []string{initstate}, Dst: initstate},
{Name: pb.ChaincodeMessage_RANGE_QUERY_STATE.String(), Src: []string{busyinitstate}, Dst: busyinitstate},
{Name: pb.ChaincodeMessage_RANGE_QUERY_STATE.String(), Src: []string{transactionstate}, Dst: transactionstate},
{Name: pb.ChaincodeMessage_RANGE_QUERY_STATE.String(), Src: []string{busyxactstate}, Dst: busyxactstate},
{Name: pb.ChaincodeMessage_RANGE_QUERY_STATE_NEXT.String(), Src: []string{readystate}, Dst: readystate},
{Name: pb.ChaincodeMessage_RANGE_QUERY_STATE_NEXT.String(), Src: []string{initstate}, Dst: initstate},
{Name: pb.ChaincodeMessage_RANGE_QUERY_STATE_NEXT.String(), Src: []string{busyinitstate}, Dst: busyinitstate},
{Name: pb.ChaincodeMessage_RANGE_QUERY_STATE_NEXT.String(), Src: []string{transactionstate}, Dst: transactionstate},
{Name: pb.ChaincodeMessage_RANGE_QUERY_STATE_NEXT.String(), Src: []string{busyxactstate}, Dst: busyxactstate},
{Name: pb.ChaincodeMessage_RANGE_QUERY_STATE_CLOSE.String(), Src: []string{readystate}, Dst: readystate},
{Name: pb.ChaincodeMessage_RANGE_QUERY_STATE_CLOSE.String(), Src: []string{initstate}, Dst: initstate},
{Name: pb.ChaincodeMessage_RANGE_QUERY_STATE_CLOSE.String(), Src: []string{busyinitstate}, Dst: busyinitstate},
{Name: pb.ChaincodeMessage_RANGE_QUERY_STATE_CLOSE.String(), Src: []string{transactionstate}, Dst: transactionstate},
{Name: pb.ChaincodeMessage_RANGE_QUERY_STATE_CLOSE.String(), Src: []string{busyxactstate}, Dst: busyxactstate},
{Name: pb.ChaincodeMessage_ERROR.String(), Src: []string{initstate}, Dst: endstate},
{Name: pb.ChaincodeMessage_ERROR.String(), Src: []string{transactionstate}, Dst: readystate},
{Name: pb.ChaincodeMessage_ERROR.String(), Src: []string{busyinitstate}, Dst: initstate},
{Name: pb.ChaincodeMessage_ERROR.String(), Src: []string{busyxactstate}, Dst: transactionstate},
{Name: pb.ChaincodeMessage_RESPONSE.String(), Src: []string{busyinitstate}, Dst: initstate},
{Name: pb.ChaincodeMessage_RESPONSE.String(), Src: []string{busyxactstate}, Dst: transactionstate},
},
fsm.Callbacks{
"before_" + pb.ChaincodeMessage_REGISTER.String(): func(e *fsm.Event) { v.beforeRegisterEvent(e, v.FSM.Current()) },
"before_" + pb.ChaincodeMessage_COMPLETED.String(): func(e *fsm.Event) { v.beforeCompletedEvent(e, v.FSM.Current()) },
"before_" + pb.ChaincodeMessage_INIT.String(): func(e *fsm.Event) { v.beforeInitState(e, v.FSM.Current()) },
"after_" + pb.ChaincodeMessage_GET_STATE.String(): func(e *fsm.Event) { v.afterGetState(e, v.FSM.Current()) },
"after_" + pb.ChaincodeMessage_RANGE_QUERY_STATE.String(): func(e *fsm.Event) { v.afterRangeQueryState(e, v.FSM.Current()) },
"after_" + pb.ChaincodeMessage_RANGE_QUERY_STATE_NEXT.String(): func(e *fsm.Event) { v.afterRangeQueryStateNext(e, v.FSM.Current()) },
"after_" + pb.ChaincodeMessage_RANGE_QUERY_STATE_CLOSE.String(): func(e *fsm.Event) { v.afterRangeQueryStateClose(e, v.FSM.Current()) },
"after_" + pb.ChaincodeMessage_PUT_STATE.String(): func(e *fsm.Event) { v.afterPutState(e, v.FSM.Current()) },
"after_" + pb.ChaincodeMessage_DEL_STATE.String(): func(e *fsm.Event) { v.afterDelState(e, v.FSM.Current()) },
"after_" + pb.ChaincodeMessage_INVOKE_CHAINCODE.String(): func(e *fsm.Event) { v.afterInvokeChaincode(e, v.FSM.Current()) },
"enter_" + establishedstate: func(e *fsm.Event) { v.enterEstablishedState(e, v.FSM.Current()) },
"enter_" + initstate: func(e *fsm.Event) { v.enterInitState(e, v.FSM.Current()) },
"enter_" + readystate: func(e *fsm.Event) { v.enterReadyState(e, v.FSM.Current()) },
"enter_" + busyinitstate: func(e *fsm.Event) { v.enterBusyState(e, v.FSM.Current()) },
"enter_" + busyxactstate: func(e *fsm.Event) { v.enterBusyState(e, v.FSM.Current()) },
"enter_" + endstate: func(e *fsm.Event) { v.enterEndState(e, v.FSM.Current()) },
},
)
return v
}
func (handler *Handler) createUUIDEntry(uuid string) bool {
if handler.uuidMap == nil {
return false
}
handler.Lock()
defer handler.Unlock()
if handler.uuidMap[uuid] {
return false
}
handler.uuidMap[uuid] = true
return handler.uuidMap[uuid]
}
func (handler *Handler) deleteUUIDEntry(uuid string) {
handler.Lock()
defer handler.Unlock()
if handler.uuidMap != nil {
delete(handler.uuidMap, uuid)
} else {
chaincodeLogger.Warning("UUID %s not found!", uuid)
}
}
// markIsTransaction marks a UUID as a transaction or a query; true = transaction, false = query
func (handler *Handler) markIsTransaction(uuid string, isTrans bool) bool {
handler.Lock()
defer handler.Unlock()
if handler.isTransaction == nil {
return false
}
handler.isTransaction[uuid] = isTrans
return true
}
func (handler *Handler) getIsTransaction(uuid string) bool {
handler.Lock()
defer handler.Unlock()
if handler.isTransaction == nil {
return false
}
return handler.isTransaction[uuid]
}
func (handler *Handler) deleteIsTransaction(uuid string) {
handler.Lock()
defer handler.Unlock()
if handler.isTransaction != nil {
delete(handler.isTransaction, uuid)
}
}
func (handler *Handler) notifyDuringStartup(val bool) {
//if USER_RUNS_CC readyNotify will be nil
if handler.readyNotify != nil {
chaincodeLogger.Debug("Notifying during startup")
handler.readyNotify <- val
} else {
chaincodeLogger.Debug("nothing to notify (dev mode ?)")
}
}
// beforeRegisterEvent is invoked when chaincode tries to register.
func (handler *Handler) beforeRegisterEvent(e *fsm.Event, state string) {
chaincodeLogger.Debug("Received %s in state %s", e.Event, state)
msg, ok := e.Args[0].(*pb.ChaincodeMessage)
if !ok {
e.Cancel(fmt.Errorf("Received unexpected message type"))
return
}
chaincodeID := &pb.ChaincodeID{}
err := proto.Unmarshal(msg.Payload, chaincodeID)
if err != nil {
e.Cancel(fmt.Errorf("Error in received %s, could NOT unmarshal registration info: %s", pb.ChaincodeMessage_REGISTER, err))
return
}
// Now register with the chaincodeSupport
handler.ChaincodeID = chaincodeID
err = handler.chaincodeSupport.registerHandler(handler)
if err != nil {
e.Cancel(err)
handler.notifyDuringStartup(false)
return
}
chaincodeLogger.Debug("Got %s for chaincodeID = %s, sending back %s", e.Event, chaincodeID, pb.ChaincodeMessage_REGISTERED)
if err := handler.serialSend(&pb.ChaincodeMessage{Type: pb.ChaincodeMessage_REGISTERED}); err != nil {
e.Cancel(fmt.Errorf("Error sending %s: %s", pb.ChaincodeMessage_REGISTERED, err))
handler.notifyDuringStartup(false)
return
}
}
func (handler *Handler) notify(msg *pb.ChaincodeMessage) {
handler.Lock()
defer handler.Unlock()
tctx := handler.txCtxs[msg.Uuid]
if tctx == nil {
chaincodeLogger.Debug("notifier Uuid:%s does not exist", msg.Uuid)
} else {
chaincodeLogger.Debug("notifying Uuid:%s", msg.Uuid)
tctx.responseNotifier <- msg
// clean up rangeQueryIteratorMap
for _, v := range tctx.rangeQueryIteratorMap {
v.Close()
}
}
}
// beforeCompletedEvent is invoked when chaincode has completed execution of init, invoke or query.
func (handler *Handler) beforeCompletedEvent(e *fsm.Event, state string) {
msg, ok := e.Args[0].(*pb.ChaincodeMessage)
if !ok {
e.Cancel(fmt.Errorf("Received unexpected message type"))
return
}
// Notify on channel once into READY state
chaincodeLogger.Debug("[%s]beforeCompleted - not in ready state will notify when in readystate", shortuuid(msg.Uuid))
return
}
// beforeInitState is invoked before an init message is sent to the chaincode.
func (handler *Handler) beforeInitState(e *fsm.Event, state string) {
chaincodeLogger.Debug("Before state %s.. notifying waiter that we are up", state)
handler.notifyDuringStartup(true)
}
// afterGetState handles a GET_STATE request from the chaincode.
func (handler *Handler) afterGetState(e *fsm.Event, state string) {
msg, ok := e.Args[0].(*pb.ChaincodeMessage)
if !ok {
e.Cancel(fmt.Errorf("Received unexpected message type"))
return
}
chaincodeLogger.Debug("[%s]Received %s, invoking get state from ledger", shortuuid(msg.Uuid), pb.ChaincodeMessage_GET_STATE)
// Query ledger for state
handler.handleGetState(msg)
}
// Handles query to ledger to get state
func (handler *Handler) handleGetState(msg *pb.ChaincodeMessage) {
// The defer followed by triggering a go routine dance is needed to ensure that the previous state transition
// is completed before the next one is triggered. The previous state transition is deemed complete only when
// the afterGetState function is exited. Interesting bug fix!!
go func() {
// Check if this is the unique state request from this chaincode uuid
uniqueReq := handler.createUUIDEntry(msg.Uuid)
if !uniqueReq {
// Drop this request
chaincodeLogger.Debug("Another state request pending for this Uuid. Cannot process.")
return
}
var serialSendMsg *pb.ChaincodeMessage
defer func() {
handler.deleteUUIDEntry(msg.Uuid)
chaincodeLogger.Debug("[%s]handleGetState serial send %s", shortuuid(serialSendMsg.Uuid), serialSendMsg.Type)
handler.serialSend(serialSendMsg)
}()
key := string(msg.Payload)
ledgerObj, ledgerErr := ledger.GetLedger()
if ledgerErr != nil {
// Send error msg back to chaincode. GetState will not trigger event
payload := []byte(ledgerErr.Error())
chaincodeLogger.Debug("Failed to get chaincode state. Sending %s", pb.ChaincodeMessage_ERROR)
// Remove uuid from current set
serialSendMsg = &pb.ChaincodeMessage{Type: pb.ChaincodeMessage_ERROR, Payload: payload, Uuid: msg.Uuid}
return
}
// Invoke ledger to get state
chaincodeID := handler.ChaincodeID.Name
readCommittedState := !handler.getIsTransaction(msg.Uuid)
res, err := ledgerObj.GetState(chaincodeID, key, readCommittedState)
if err != nil {
// Send error msg back to chaincode. GetState will not trigger event
payload := []byte(err.Error())
chaincodeLogger.Debug("[%s]Failed to get chaincode state. Sending %s", shortuuid(msg.Uuid), pb.ChaincodeMessage_ERROR)
serialSendMsg = &pb.ChaincodeMessage{Type: pb.ChaincodeMessage_ERROR, Payload: payload, Uuid: msg.Uuid}
} else {
// Decrypt the data if the confidential is enabled
if res, err = handler.decrypt(msg.Uuid, res); err == nil {
// Send response msg back to chaincode. GetState will not trigger event
chaincodeLogger.Debug("[%s]Got state. Sending %s", shortuuid(msg.Uuid), pb.ChaincodeMessage_RESPONSE)
serialSendMsg = &pb.ChaincodeMessage{Type: pb.ChaincodeMessage_RESPONSE, Payload: res, Uuid: msg.Uuid}
} else {
// Send err msg back to chaincode.
chaincodeLogger.Debug("[%s]Got error while decrypting. Sending %s", shortuuid(msg.Uuid), pb.ChaincodeMessage_ERROR)
errBytes := []byte(err.Error())
serialSendMsg = &pb.ChaincodeMessage{Type: pb.ChaincodeMessage_ERROR, Payload: errBytes, Uuid: msg.Uuid}
}
}
}()
}
const maxRangeQueryStateLimit = 100
// afterRangeQueryState handles a RANGE_QUERY_STATE request from the chaincode.
func (handler *Handler) afterRangeQueryState(e *fsm.Event, state string) {
msg, ok := e.Args[0].(*pb.ChaincodeMessage)
if !ok {
e.Cancel(fmt.Errorf("Received unexpected message type"))
return
}
chaincodeLogger.Debug("Received %s, invoking get state from ledger", pb.ChaincodeMessage_RANGE_QUERY_STATE)
// Query ledger for state
handler.handleRangeQueryState(msg)
chaincodeLogger.Debug("Exiting GET_STATE")
}
// Handles query to ledger to rage query state
func (handler *Handler) handleRangeQueryState(msg *pb.ChaincodeMessage) {
// The defer followed by triggering a go routine dance is needed to ensure that the previous state transition
// is completed before the next one is triggered. The previous state transition is deemed complete only when
// the afterRangeQueryState function is exited. Interesting bug fix!!
go func() {
// Check if this is the unique state request from this chaincode uuid
uniqueReq := handler.createUUIDEntry(msg.Uuid)
if !uniqueReq {
// Drop this request
chaincodeLogger.Debug("Another state request pending for this Uuid. Cannot process.")
return
}
var serialSendMsg *pb.ChaincodeMessage
defer func() {
handler.deleteUUIDEntry(msg.Uuid)
chaincodeLogger.Debug("[%s]handleRangeQueryState serial send %s", shortuuid(serialSendMsg.Uuid), serialSendMsg.Type)
handler.serialSend(serialSendMsg)
}()
rangeQueryState := &pb.RangeQueryState{}
unmarshalErr := proto.Unmarshal(msg.Payload, rangeQueryState)
if unmarshalErr != nil {
payload := []byte(unmarshalErr.Error())
chaincodeLogger.Debug("Failed to unmarshall range query request. Sending %s", pb.ChaincodeMessage_ERROR)
serialSendMsg = &pb.ChaincodeMessage{Type: pb.ChaincodeMessage_ERROR, Payload: payload, Uuid: msg.Uuid}
return
}
hasNext := true
ledger, ledgerErr := ledger.GetLedger()
if ledgerErr != nil {
// Send error msg back to chaincode. GetState will not trigger event
payload := []byte(ledgerErr.Error())
chaincodeLogger.Debug("Failed to get ledger. Sending %s", pb.ChaincodeMessage_ERROR)
serialSendMsg = &pb.ChaincodeMessage{Type: pb.ChaincodeMessage_ERROR, Payload: payload, Uuid: msg.Uuid}
return
}
chaincodeID := handler.ChaincodeID.Name
readCommittedState := !handler.getIsTransaction(msg.Uuid)
rangeIter, err := ledger.GetStateRangeScanIterator(chaincodeID, rangeQueryState.StartKey, rangeQueryState.EndKey, readCommittedState)
if err != nil {
// Send error msg back to chaincode. GetState will not trigger event
payload := []byte(err.Error())
chaincodeLogger.Debug("Failed to get ledger scan iterator. Sending %s", pb.ChaincodeMessage_ERROR)
serialSendMsg = &pb.ChaincodeMessage{Type: pb.ChaincodeMessage_ERROR, Payload: payload, Uuid: msg.Uuid}
return
}
iterID := util.GenerateUUID()
txContext := handler.getTxContext(msg.Uuid)
handler.putRangeQueryIterator(txContext, iterID, rangeIter)
hasNext = rangeIter.Next()
var keysAndValues []*pb.RangeQueryStateKeyValue
var i = uint32(0)
for ; hasNext && i < maxRangeQueryStateLimit; i++ {
key, value := rangeIter.GetKeyValue()
// Decrypt the data if the confidential is enabled
decryptedValue, err := handler.decrypt(msg.Uuid, value)
if err != nil {
payload := []byte(unmarshalErr.Error())
chaincodeLogger.Debug("Failed decrypt value. Sending %s", pb.ChaincodeMessage_ERROR)
serialSendMsg = &pb.ChaincodeMessage{Type: pb.ChaincodeMessage_ERROR, Payload: payload, Uuid: msg.Uuid}
rangeIter.Close()
handler.deleteRangeQueryIterator(txContext, iterID)
return
}
keyAndValue := pb.RangeQueryStateKeyValue{Key: key, Value: decryptedValue}
keysAndValues = append(keysAndValues, &keyAndValue)
hasNext = rangeIter.Next()
}
if !hasNext {
rangeIter.Close()
handler.deleteRangeQueryIterator(txContext, iterID)
}
payload := &pb.RangeQueryStateResponse{KeysAndValues: keysAndValues, HasMore: hasNext, ID: iterID}
payloadBytes, err := proto.Marshal(payload)
if err != nil {
rangeIter.Close()
handler.deleteRangeQueryIterator(txContext, iterID)
// Send error msg back to chaincode. GetState will not trigger event
payload := []byte(err.Error())
chaincodeLogger.Debug("Failed marshall resopnse. Sending %s", pb.ChaincodeMessage_ERROR)
serialSendMsg = &pb.ChaincodeMessage{Type: pb.ChaincodeMessage_ERROR, Payload: payload, Uuid: msg.Uuid}
return
}
chaincodeLogger.Debug("Got keys and values. Sending %s", pb.ChaincodeMessage_RESPONSE)
serialSendMsg = &pb.ChaincodeMessage{Type: pb.ChaincodeMessage_RESPONSE, Payload: payloadBytes, Uuid: msg.Uuid}
}()
}
// afterRangeQueryState handles a RANGE_QUERY_STATE_NEXT request from the chaincode.
func (handler *Handler) afterRangeQueryStateNext(e *fsm.Event, state string) {
msg, ok := e.Args[0].(*pb.ChaincodeMessage)
if !ok {
e.Cancel(fmt.Errorf("Received unexpected message type"))
return
}
chaincodeLogger.Debug("Received %s, invoking get state from ledger", pb.ChaincodeMessage_RANGE_QUERY_STATE)
// Query ledger for state
handler.handleRangeQueryStateNext(msg)
chaincodeLogger.Debug("Exiting RANGE_QUERY_STATE_NEXT")
}
// Handles query to ledger to rage query state nexy
func (handler *Handler) handleRangeQueryStateNext(msg *pb.ChaincodeMessage) {
// The defer followed by triggering a go routine dance is needed to ensure that the previous state transition
// is completed before the next one is triggered. The previous state transition is deemed complete only when
// the afterRangeQueryState function is exited. Interesting bug fix!!
go func() {
// Check if this is the unique state request from this chaincode uuid
uniqueReq := handler.createUUIDEntry(msg.Uuid)
if !uniqueReq {
// Drop this request
chaincodeLogger.Debug("Another state request pending for this Uuid. Cannot process.")
return
}
var serialSendMsg *pb.ChaincodeMessage
defer func() {
handler.deleteUUIDEntry(msg.Uuid)
chaincodeLogger.Debug("[%s]handleRangeQueryState serial send %s", shortuuid(serialSendMsg.Uuid), serialSendMsg.Type)
handler.serialSend(serialSendMsg)
}()
rangeQueryStateNext := &pb.RangeQueryStateNext{}
unmarshalErr := proto.Unmarshal(msg.Payload, rangeQueryStateNext)
if unmarshalErr != nil {
payload := []byte(unmarshalErr.Error())
chaincodeLogger.Debug("Failed to unmarshall state range next query request. Sending %s", pb.ChaincodeMessage_ERROR)
serialSendMsg = &pb.ChaincodeMessage{Type: pb.ChaincodeMessage_ERROR, Payload: payload, Uuid: msg.Uuid}
return
}
txContext := handler.getTxContext(msg.Uuid)
rangeIter := handler.getRangeQueryIterator(txContext, rangeQueryStateNext.ID)
if rangeIter == nil {
payload := []byte("Range query iterator not found")
chaincodeLogger.Debug("Range query iterator not found. Sending %s", pb.ChaincodeMessage_ERROR)
serialSendMsg = &pb.ChaincodeMessage{Type: pb.ChaincodeMessage_ERROR, Payload: payload, Uuid: msg.Uuid}
return
}
var keysAndValues []*pb.RangeQueryStateKeyValue
var i = uint32(0)
hasNext := true
for ; hasNext && i < maxRangeQueryStateLimit; i++ {
key, value := rangeIter.GetKeyValue()
// Decrypt the data if the confidential is enabled
decryptedValue, err := handler.decrypt(msg.Uuid, value)
if err != nil {
payload := []byte(unmarshalErr.Error())
chaincodeLogger.Debug("Failed decrypt value. Sending %s", pb.ChaincodeMessage_ERROR)
serialSendMsg = &pb.ChaincodeMessage{Type: pb.ChaincodeMessage_ERROR, Payload: payload, Uuid: msg.Uuid}
rangeIter.Close()
handler.deleteRangeQueryIterator(txContext, rangeQueryStateNext.ID)
return
}
keyAndValue := pb.RangeQueryStateKeyValue{Key: key, Value: decryptedValue}
keysAndValues = append(keysAndValues, &keyAndValue)
hasNext = rangeIter.Next()
}
if !hasNext {
rangeIter.Close()
handler.deleteRangeQueryIterator(txContext, rangeQueryStateNext.ID)
}
payload := &pb.RangeQueryStateResponse{KeysAndValues: keysAndValues, HasMore: hasNext, ID: rangeQueryStateNext.ID}
payloadBytes, err := proto.Marshal(payload)
if err != nil {
rangeIter.Close()
handler.deleteRangeQueryIterator(txContext, rangeQueryStateNext.ID)
// Send error msg back to chaincode. GetState will not trigger event
payload := []byte(err.Error())
chaincodeLogger.Debug("Failed marshall resopnse. Sending %s", pb.ChaincodeMessage_ERROR)
serialSendMsg = &pb.ChaincodeMessage{Type: pb.ChaincodeMessage_ERROR, Payload: payload, Uuid: msg.Uuid}
return
}
chaincodeLogger.Debug("Got keys and values. Sending %s", pb.ChaincodeMessage_RESPONSE)
serialSendMsg = &pb.ChaincodeMessage{Type: pb.ChaincodeMessage_RESPONSE, Payload: payloadBytes, Uuid: msg.Uuid}
}()
}
// afterRangeQueryState handles a RANGE_QUERY_STATE_CLOSE request from the chaincode.
func (handler *Handler) afterRangeQueryStateClose(e *fsm.Event, state string) {
msg, ok := e.Args[0].(*pb.ChaincodeMessage)
if !ok {
e.Cancel(fmt.Errorf("Received unexpected message type"))
return
}
chaincodeLogger.Debug("Received %s, invoking get state from ledger", pb.ChaincodeMessage_RANGE_QUERY_STATE)
// Query ledger for state
handler.handleRangeQueryStateClose(msg)
chaincodeLogger.Debug("Exiting RANGE_QUERY_STATE_CLOSE")
}
// Handles the closing of a state iterator
func (handler *Handler) handleRangeQueryStateClose(msg *pb.ChaincodeMessage) {
// The defer followed by triggering a go routine dance is needed to ensure that the previous state transition
// is completed before the next one is triggered. The previous state transition is deemed complete only when
// the afterRangeQueryState function is exited. Interesting bug fix!!
go func() {
// Check if this is the unique state request from this chaincode uuid
uniqueReq := handler.createUUIDEntry(msg.Uuid)
if !uniqueReq {
// Drop this request
chaincodeLogger.Debug("Another state request pending for this Uuid. Cannot process.")
return
}
var serialSendMsg *pb.ChaincodeMessage
defer func() {
handler.deleteUUIDEntry(msg.Uuid)
chaincodeLogger.Debug("[%s]handleRangeQueryState serial send %s", shortuuid(serialSendMsg.Uuid), serialSendMsg.Type)
handler.serialSend(serialSendMsg)
}()
rangeQueryStateClose := &pb.RangeQueryStateClose{}
unmarshalErr := proto.Unmarshal(msg.Payload, rangeQueryStateClose)
if unmarshalErr != nil {
payload := []byte(unmarshalErr.Error())
chaincodeLogger.Debug("Failed to unmarshall state range query close request. Sending %s", pb.ChaincodeMessage_ERROR)
serialSendMsg = &pb.ChaincodeMessage{Type: pb.ChaincodeMessage_ERROR, Payload: payload, Uuid: msg.Uuid}
return
}
txContext := handler.getTxContext(msg.Uuid)
iter := handler.getRangeQueryIterator(txContext, rangeQueryStateClose.ID)
if iter != nil {
iter.Close()
handler.deleteRangeQueryIterator(txContext, rangeQueryStateClose.ID)
}
payload := &pb.RangeQueryStateResponse{HasMore: false, ID: rangeQueryStateClose.ID}
payloadBytes, err := proto.Marshal(payload)
if err != nil {
// Send error msg back to chaincode. GetState will not trigger event
payload := []byte(err.Error())
chaincodeLogger.Debug("Failed marshall resopnse. Sending %s", pb.ChaincodeMessage_ERROR)
serialSendMsg = &pb.ChaincodeMessage{Type: pb.ChaincodeMessage_ERROR, Payload: payload, Uuid: msg.Uuid}
return
}
chaincodeLogger.Debug("Closed. Sending %s", pb.ChaincodeMessage_RESPONSE)
serialSendMsg = &pb.ChaincodeMessage{Type: pb.ChaincodeMessage_RESPONSE, Payload: payloadBytes, Uuid: msg.Uuid}
}()
}
// afterPutState handles a PUT_STATE request from the chaincode.
func (handler *Handler) afterPutState(e *fsm.Event, state string) {
_, ok := e.Args[0].(*pb.ChaincodeMessage)
if !ok {
e.Cancel(fmt.Errorf("Received unexpected message type"))
return
}
chaincodeLogger.Debug("Received %s in state %s, invoking put state to ledger", pb.ChaincodeMessage_PUT_STATE, state)
// Put state into ledger handled within enterBusyState
}
// afterDelState handles a DEL_STATE request from the chaincode.
func (handler *Handler) afterDelState(e *fsm.Event, state string) {
_, ok := e.Args[0].(*pb.ChaincodeMessage)
if !ok {
e.Cancel(fmt.Errorf("Received unexpected message type"))
return
}
chaincodeLogger.Debug("Received %s, invoking delete state from ledger", pb.ChaincodeMessage_DEL_STATE)
// Delete state from ledger handled within enterBusyState
}
// afterInvokeChaincode handles an INVOKE_CHAINCODE request from the chaincode.
func (handler *Handler) afterInvokeChaincode(e *fsm.Event, state string) {
_, ok := e.Args[0].(*pb.ChaincodeMessage)
if !ok {
e.Cancel(fmt.Errorf("Received unexpected message type"))
return
}
chaincodeLogger.Debug("Received %s in state %s, invoking another chaincode", pb.ChaincodeMessage_INVOKE_CHAINCODE, state)
// Invoke another chaincode handled within enterBusyState
}
// Handles request to ledger to put state
func (handler *Handler) enterBusyState(e *fsm.Event, state string) {
go func() {
msg, _ := e.Args[0].(*pb.ChaincodeMessage)
// First check if this UUID is a transaction; error otherwise
if !handler.getIsTransaction(msg.Uuid) {
payload := []byte(fmt.Sprintf("Cannot handle %s in query context", msg.Type.String()))
chaincodeLogger.Debug("[%s]Cannot handle %s in query context. Sending %s", shortuuid(msg.Uuid), msg.Type.String(), pb.ChaincodeMessage_ERROR)
errMsg := &pb.ChaincodeMessage{Type: pb.ChaincodeMessage_ERROR, Payload: payload, Uuid: msg.Uuid}
handler.triggerNextState(errMsg, true)
return
}
chaincodeLogger.Debug("[%s]state is %s", shortuuid(msg.Uuid), state)
// Check if this is the unique request from this chaincode uuid
uniqueReq := handler.createUUIDEntry(msg.Uuid)
if !uniqueReq {
// Drop this request
chaincodeLogger.Debug("Another request pending for this Uuid. Cannot process.")
return
}
var triggerNextStateMsg *pb.ChaincodeMessage
defer func() {
handler.deleteUUIDEntry(msg.Uuid)
chaincodeLogger.Debug("[%s]enterBusyState trigger event %s", shortuuid(triggerNextStateMsg.Uuid), triggerNextStateMsg.Type)
handler.triggerNextState(triggerNextStateMsg, true)
}()
ledgerObj, ledgerErr := ledger.GetLedger()
if ledgerErr != nil {
// Send error msg back to chaincode and trigger event
payload := []byte(ledgerErr.Error())
chaincodeLogger.Debug("[%s]Failed to handle %s. Sending %s", shortuuid(msg.Uuid), msg.Type.String(), pb.ChaincodeMessage_ERROR)
triggerNextStateMsg = &pb.ChaincodeMessage{Type: pb.ChaincodeMessage_ERROR, Payload: payload, Uuid: msg.Uuid}
return
}
chaincodeID := handler.ChaincodeID.Name
var err error
var res []byte
if msg.Type.String() == pb.ChaincodeMessage_PUT_STATE.String() {
putStateInfo := &pb.PutStateInfo{}
unmarshalErr := proto.Unmarshal(msg.Payload, putStateInfo)
if unmarshalErr != nil {
payload := []byte(unmarshalErr.Error())
chaincodeLogger.Debug("[%s]Unable to decipher payload. Sending %s", shortuuid(msg.Uuid), pb.ChaincodeMessage_ERROR)
triggerNextStateMsg = &pb.ChaincodeMessage{Type: pb.ChaincodeMessage_ERROR, Payload: payload, Uuid: msg.Uuid}
return
}
var pVal []byte
// Encrypt the data if the confidential is enabled
if pVal, err = handler.encrypt(msg.Uuid, putStateInfo.Value); err == nil {
// Invoke ledger to put state
err = ledgerObj.SetState(chaincodeID, putStateInfo.Key, pVal)
}
} else if msg.Type.String() == pb.ChaincodeMessage_DEL_STATE.String() {
// Invoke ledger to delete state
key := string(msg.Payload)
err = ledgerObj.DeleteState(chaincodeID, key)
} else if msg.Type.String() == pb.ChaincodeMessage_INVOKE_CHAINCODE.String() {
chaincodeSpec := &pb.ChaincodeSpec{}
unmarshalErr := proto.Unmarshal(msg.Payload, chaincodeSpec)
if unmarshalErr != nil {
payload := []byte(unmarshalErr.Error())
chaincodeLogger.Debug("[%s]Unable to decipher payload. Sending %s", shortuuid(msg.Uuid), pb.ChaincodeMessage_ERROR)
triggerNextStateMsg = &pb.ChaincodeMessage{Type: pb.ChaincodeMessage_ERROR, Payload: payload, Uuid: msg.Uuid}
return
}
// Get the chaincodeID to invoke
newChaincodeID := chaincodeSpec.ChaincodeID.Name
// Create the transaction object
chaincodeInvocationSpec := &pb.ChaincodeInvocationSpec{ChaincodeSpec: chaincodeSpec}
transaction, _ := pb.NewChaincodeExecute(chaincodeInvocationSpec, msg.Uuid, pb.Transaction_CHAINCODE_EXECUTE)
// Launch the new chaincode if not already running
_, chaincodeInput, launchErr := handler.chaincodeSupport.LaunchChaincode(context.Background(), transaction)
if launchErr != nil {
payload := []byte(launchErr.Error())
chaincodeLogger.Debug("[%s]Failed to launch invoked chaincode. Sending %s", shortuuid(msg.Uuid), pb.ChaincodeMessage_ERROR)
triggerNextStateMsg = &pb.ChaincodeMessage{Type: pb.ChaincodeMessage_ERROR, Payload: payload, Uuid: msg.Uuid}
return
}