/*
Copyright IBM Corp. 2016 All Rights Reserved.

Licensed 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 (
	"bytes"
	"fmt"
	"io"
	"strconv"
	"sync"
	"time"

	"github.com/golang/protobuf/proto"
	"github.com/spf13/viper"
	"golang.org/x/net/context"

	"strings"

	"github.com/hyperledger/fabric/core/container"
	"github.com/hyperledger/fabric/core/container/ccintf"
	"github.com/hyperledger/fabric/core/crypto"
	"github.com/hyperledger/fabric/core/ledger"
	pb "github.com/hyperledger/fabric/protos"
)

// ChainName is the name of the chain to which this chaincode support belongs to.
type ChainName string

const (
	// DefaultChain is the name of the default chain.
	DefaultChain ChainName = "default"
	// DevModeUserRunsChaincode property allows user to run chaincode in development environment
	DevModeUserRunsChaincode       string = "dev"
	chaincodeStartupTimeoutDefault int    = 5000
	chaincodeInstallPathDefault    string = "/opt/gopath/bin/"
	peerAddressDefault             string = "0.0.0.0:7051"
)

// chains is a map between different blockchains and their ChaincodeSupport.
//this needs to be a first class, top-level object... for now, lets just have a placeholder
var chains map[ChainName]*ChaincodeSupport

func init() {
	chains = make(map[ChainName]*ChaincodeSupport)
}

//chaincode runtime environment encapsulates handler and container environment
//This is where the VM that's running the chaincode would hook in
type chaincodeRTEnv struct {
	handler *Handler
}

// runningChaincodes contains maps of chaincodeIDs to their chaincodeRTEs
type runningChaincodes struct {
	sync.RWMutex
	// chaincode environment for each chaincode
	chaincodeMap map[string]*chaincodeRTEnv
}

// GetChain returns the chaincode support for a given chain
func GetChain(name ChainName) *ChaincodeSupport {
	return chains[name]
}

//call this under lock
func (chaincodeSupport *ChaincodeSupport) preLaunchSetup(chaincode string) chan bool {
	//register placeholder Handler. This will be transferred in registerHandler
	//NOTE: from this point, existence of handler for this chaincode means the chaincode
	//is in the process of getting started (or has been started)
	notfy := make(chan bool, 1)
	chaincodeSupport.runningChaincodes.chaincodeMap[chaincode] = &chaincodeRTEnv{handler: &Handler{readyNotify: notfy}}
	return notfy
}

//call this under lock
func (chaincodeSupport *ChaincodeSupport) chaincodeHasBeenLaunched(chaincode string) (*chaincodeRTEnv, bool) {
	chrte, hasbeenlaunched := chaincodeSupport.runningChaincodes.chaincodeMap[chaincode]
	return chrte, hasbeenlaunched
}

// NewChaincodeSupport creates a new ChaincodeSupport instance
func NewChaincodeSupport(chainname ChainName, getPeerEndpoint func() (*pb.PeerEndpoint, error), userrunsCC bool, ccstartuptimeout time.Duration, secHelper crypto.Peer) *ChaincodeSupport {
	pnid := viper.GetString("peer.networkId")
	pid := viper.GetString("peer.id")

	s := &ChaincodeSupport{name: chainname, runningChaincodes: &runningChaincodes{chaincodeMap: make(map[string]*chaincodeRTEnv)}, secHelper: secHelper, peerNetworkID: pnid, peerID: pid}

	//initialize global chain
	chains[chainname] = s

	peerEndpoint, err := getPeerEndpoint()
	if err != nil {
		chaincodeLogger.Errorf("Error getting PeerEndpoint, using peer.address: %s", err)
		s.peerAddress = viper.GetString("peer.address")
	} else {
		s.peerAddress = peerEndpoint.Address
	}
	chaincodeLogger.Infof("Chaincode support using peerAddress: %s\n", s.peerAddress)
	//peerAddress = viper.GetString("peer.address")
	if s.peerAddress == "" {
		s.peerAddress = peerAddressDefault
	}

	s.userRunsCC = userrunsCC

	s.ccStartupTimeout = ccstartuptimeout

	//TODO I'm not sure if this needs to be on a per chain basis... too lowel and just needs to be a global default ?
	s.chaincodeInstallPath = viper.GetString("chaincode.installpath")
	if s.chaincodeInstallPath == "" {
		s.chaincodeInstallPath = chaincodeInstallPathDefault
	}

	s.peerTLS = viper.GetBool("peer.tls.enabled")
	if s.peerTLS {
		s.peerTLSCertFile = viper.GetString("peer.tls.cert.file")
		s.peerTLSKeyFile = viper.GetString("peer.tls.key.file")
		s.peerTLSSvrHostOrd = viper.GetString("peer.tls.serverhostoverride")
	}

	kadef := 0
	if ka := viper.GetString("chaincode.keepalive"); ka == "" {
		s.keepalive = time.Duration(kadef) * time.Second
	} else {
		t, terr := strconv.Atoi(ka)
		if terr != nil {
			chaincodeLogger.Errorf("Invalid keepalive value %s (%s) defaulting to %d", ka, terr, kadef)
			t = kadef
		} else if t <= 0 {
			chaincodeLogger.Debugf("Turn off keepalive(value %s)", ka)
			t = kadef
		}
		s.keepalive = time.Duration(t) * time.Second
	}

	return s
}

// // ChaincodeStream standard stream for ChaincodeMessage type.
// type ChaincodeStream interface {
// 	Send(*pb.ChaincodeMessage) error
// 	Recv() (*pb.ChaincodeMessage, error)
// }

// ChaincodeSupport responsible for providing interfacing with chaincodes from the Peer.
type ChaincodeSupport struct {
	name                 ChainName
	runningChaincodes    *runningChaincodes
	peerAddress          string
	ccStartupTimeout     time.Duration
	chaincodeInstallPath string
	userRunsCC           bool
	secHelper            crypto.Peer
	peerNetworkID        string
	peerID               string
	peerTLS              bool
	peerTLSCertFile      string
	peerTLSKeyFile       string
	peerTLSSvrHostOrd    string
	keepalive            time.Duration
}

// DuplicateChaincodeHandlerError returned if attempt to register same chaincodeID while a stream already exists.
type DuplicateChaincodeHandlerError struct {
	ChaincodeID *pb.ChaincodeID
}

func (d *DuplicateChaincodeHandlerError) Error() string {
	return fmt.Sprintf("Duplicate chaincodeID error: %s", d.ChaincodeID)
}

func newDuplicateChaincodeHandlerError(chaincodeHandler *Handler) error {
	return &DuplicateChaincodeHandlerError{ChaincodeID: chaincodeHandler.ChaincodeID}
}

func (chaincodeSupport *ChaincodeSupport) registerHandler(chaincodehandler *Handler) error {
	key := chaincodehandler.ChaincodeID.Name

	chaincodeSupport.runningChaincodes.Lock()
	defer chaincodeSupport.runningChaincodes.Unlock()

	chrte2, ok := chaincodeSupport.chaincodeHasBeenLaunched(key)
	if ok && chrte2.handler.registered == true {
		chaincodeLogger.Debugf("duplicate registered handler(key:%s) return error", key)
		// Duplicate, return error
		return newDuplicateChaincodeHandlerError(chaincodehandler)
	}
	//a placeholder, unregistered handler will be setup by query or transaction processing that comes
	//through via consensus. In this case we swap the handler and give it the notify channel
	if chrte2 != nil {
		chaincodehandler.readyNotify = chrte2.handler.readyNotify
		chrte2.handler = chaincodehandler
	} else {
		chaincodeSupport.runningChaincodes.chaincodeMap[key] = &chaincodeRTEnv{handler: chaincodehandler}
	}

	chaincodehandler.registered = true

	//now we are ready to receive messages and send back responses
	chaincodehandler.txCtxs = make(map[string]*transactionContext)
	chaincodehandler.txidMap = make(map[string]bool)
	chaincodehandler.isTransaction = make(map[string]bool)

	chaincodeLogger.Debugf("registered handler complete for chaincode %s", key)

	return nil
}

func (chaincodeSupport *ChaincodeSupport) deregisterHandler(chaincodehandler *Handler) error {

	// clean up rangeQueryIteratorMap
	for _, context := range chaincodehandler.txCtxs {
		for _, v := range context.rangeQueryIteratorMap {
			v.Close()
		}
	}

	key := chaincodehandler.ChaincodeID.Name
	chaincodeLogger.Debugf("Deregister handler: %s", key)
	chaincodeSupport.runningChaincodes.Lock()
	defer chaincodeSupport.runningChaincodes.Unlock()
	if _, ok := chaincodeSupport.chaincodeHasBeenLaunched(key); !ok {
		// Handler NOT found
		return fmt.Errorf("Error deregistering handler, could not find handler with key: %s", key)
	}
	delete(chaincodeSupport.runningChaincodes.chaincodeMap, key)
	chaincodeLogger.Debugf("Deregistered handler with key: %s", key)
	return nil
}

// Based on state of chaincode send either init or ready to move to ready state
func (chaincodeSupport *ChaincodeSupport) sendInitOrReady(context context.Context, txid string, chaincode string, initArgs [][]byte, timeout time.Duration, tx *pb.Transaction, depTx *pb.Transaction) error {
	chaincodeSupport.runningChaincodes.Lock()
	//if its in the map, there must be a connected stream...nothing to do
	var chrte *chaincodeRTEnv
	var ok bool
	if chrte, ok = chaincodeSupport.chaincodeHasBeenLaunched(chaincode); !ok {
		chaincodeSupport.runningChaincodes.Unlock()
		chaincodeLogger.Debugf("handler not found for chaincode %s", chaincode)
		return fmt.Errorf("handler not found for chaincode %s", chaincode)
	}
	chaincodeSupport.runningChaincodes.Unlock()

	var notfy chan *pb.ChaincodeMessage
	var err error
	if notfy, err = chrte.handler.initOrReady(txid, initArgs, tx, depTx); err != nil {
		return fmt.Errorf("Error sending %s: %s", pb.ChaincodeMessage_INIT, err)
	}
	if notfy != nil {
		select {
		case ccMsg := <-notfy:
			if ccMsg.Type == pb.ChaincodeMessage_ERROR {
				err = fmt.Errorf("Error initializing container %s: %s", chaincode, string(ccMsg.Payload))
			}
		case <-time.After(timeout):
			err = fmt.Errorf("Timeout expired while executing send init message")
		}
	}

	//if initOrReady succeeded, our responsibility to delete the context
	chrte.handler.deleteTxContext(txid)

	return err
}

//get args and env given chaincodeID
func (chaincodeSupport *ChaincodeSupport) getArgsAndEnv(cID *pb.ChaincodeID, cLang pb.ChaincodeSpec_Type) (args []string, envs []string, err error) {
	envs = []string{"CORE_CHAINCODE_ID_NAME=" + cID.Name}
	//if TLS is enabled, pass TLS material to chaincode
	if chaincodeSupport.peerTLS {
		envs = append(envs, "CORE_PEER_TLS_ENABLED=true")
		envs = append(envs, "CORE_PEER_TLS_CERT_FILE="+chaincodeSupport.peerTLSCertFile)
		if chaincodeSupport.peerTLSSvrHostOrd != "" {
			envs = append(envs, "CORE_PEER_TLS_SERVERHOSTOVERRIDE="+chaincodeSupport.peerTLSSvrHostOrd)
		}
	} else {
		envs = append(envs, "CORE_PEER_TLS_ENABLED=false")
	}
	switch cLang {
	case pb.ChaincodeSpec_GOLANG, pb.ChaincodeSpec_CAR:
		//chaincode executable will be same as the name of the chaincode
		args = []string{chaincodeSupport.chaincodeInstallPath + cID.Name, fmt.Sprintf("-peer.address=%s", chaincodeSupport.peerAddress)}
		chaincodeLogger.Debugf("Executable is %s", args[0])
	case pb.ChaincodeSpec_JAVA:
		//TODO add security args
		args = strings.Split(
			fmt.Sprintf("java -jar chaincode.jar -a %s -i %s",
				chaincodeSupport.peerAddress, cID.Name),
			" ")
		if chaincodeSupport.peerTLS {
			args = append(args, " -s")
		}
		chaincodeLogger.Debugf("Executable is %s", args[0])
	default:
		return nil, nil, fmt.Errorf("Unknown chaincodeType: %s", cLang)
	}
	return args, envs, nil
}

// launchAndWaitForRegister will launch container if not already running. Use the targz to create the image if not found
func (chaincodeSupport *ChaincodeSupport) launchAndWaitForRegister(ctxt context.Context, cds *pb.ChaincodeDeploymentSpec, cID *pb.ChaincodeID, txid string, cLang pb.ChaincodeSpec_Type, targz io.Reader) (bool, error) {
	chaincode := cID.Name
	if chaincode == "" {
		return false, fmt.Errorf("chaincode name not set")
	}

	chaincodeSupport.runningChaincodes.Lock()
	var ok bool
	//if its in the map, there must be a connected stream...nothing to do
	if _, ok = chaincodeSupport.chaincodeHasBeenLaunched(chaincode); ok {
		chaincodeLogger.Debugf("chaincode is running and ready: %s", chaincode)
		chaincodeSupport.runningChaincodes.Unlock()
		return true, nil
	}
	alreadyRunning := false

	notfy := chaincodeSupport.preLaunchSetup(chaincode)
	chaincodeSupport.runningChaincodes.Unlock()

	//launch the chaincode

	args, env, err := chaincodeSupport.getArgsAndEnv(cID, cLang)
	if err != nil {
		return alreadyRunning, err
	}

	chaincodeLogger.Debugf("start container: %s(networkid:%s,peerid:%s)", chaincode, chaincodeSupport.peerNetworkID, chaincodeSupport.peerID)

	vmtype, _ := chaincodeSupport.getVMType(cds)

	sir := container.StartImageReq{CCID: ccintf.CCID{ChaincodeSpec: cds.ChaincodeSpec, NetworkID: chaincodeSupport.peerNetworkID, PeerID: chaincodeSupport.peerID}, Reader: targz, Args: args, Env: env}

	ipcCtxt := context.WithValue(ctxt, ccintf.GetCCHandlerKey(), chaincodeSupport)

	resp, err := container.VMCProcess(ipcCtxt, vmtype, sir)
	if err != nil || (resp != nil && resp.(container.VMCResp).Err != nil) {
		if err == nil {
			err = resp.(container.VMCResp).Err
		}
		err = fmt.Errorf("Error starting container: %s", err)
		chaincodeSupport.runningChaincodes.Lock()
		delete(chaincodeSupport.runningChaincodes.chaincodeMap, chaincode)
		chaincodeSupport.runningChaincodes.Unlock()
		return alreadyRunning, err
	}

	//wait for REGISTER state
	select {
	case ok := <-notfy:
		if !ok {
			err = fmt.Errorf("registration failed for %s(networkid:%s,peerid:%s,tx:%s)", chaincode, chaincodeSupport.peerNetworkID, chaincodeSupport.peerID, txid)
		}
	case <-time.After(chaincodeSupport.ccStartupTimeout):
		err = fmt.Errorf("Timeout expired while starting chaincode %s(networkid:%s,peerid:%s,tx:%s)", chaincode, chaincodeSupport.peerNetworkID, chaincodeSupport.peerID, txid)
	}
	if err != nil {
		chaincodeLogger.Debugf("stopping due to error while launching %s", err)
		errIgnore := chaincodeSupport.Stop(ctxt, cds)
		if errIgnore != nil {
			chaincodeLogger.Debugf("error on stop %s(%s)", errIgnore, err)
		}
	}
	return alreadyRunning, err
}

//Stop stops a chaincode if running
func (chaincodeSupport *ChaincodeSupport) Stop(context context.Context, cds *pb.ChaincodeDeploymentSpec) error {
	chaincode := cds.ChaincodeSpec.ChaincodeID.Name
	if chaincode == "" {
		return fmt.Errorf("chaincode name not set")
	}

	//stop the chaincode
	sir := container.StopImageReq{CCID: ccintf.CCID{ChaincodeSpec: cds.ChaincodeSpec, NetworkID: chaincodeSupport.peerNetworkID, PeerID: chaincodeSupport.peerID}, Timeout: 0}

	vmtype, _ := chaincodeSupport.getVMType(cds)

	_, err := container.VMCProcess(context, vmtype, sir)
	if err != nil {
		err = fmt.Errorf("Error stopping container: %s", err)
		//but proceed to cleanup
	}

	chaincodeSupport.runningChaincodes.Lock()
	if _, ok := chaincodeSupport.chaincodeHasBeenLaunched(chaincode); !ok {
		//nothing to do
		chaincodeSupport.runningChaincodes.Unlock()
		return nil
	}

	delete(chaincodeSupport.runningChaincodes.chaincodeMap, chaincode)

	chaincodeSupport.runningChaincodes.Unlock()

	return err
}

// Launch will launch the chaincode if not running (if running return nil) and will wait for handler of the chaincode to get into FSM ready state.
func (chaincodeSupport *ChaincodeSupport) Launch(context context.Context, t *pb.Transaction) (*pb.ChaincodeID, *pb.ChaincodeInput, error) {
	//build the chaincode
	var cID *pb.ChaincodeID
	var cMsg *pb.ChaincodeInput
	var cLang pb.ChaincodeSpec_Type
	var initargs [][]byte

	cds := &pb.ChaincodeDeploymentSpec{}
	if t.Type == pb.Transaction_CHAINCODE_DEPLOY {
		err := proto.Unmarshal(t.Payload, cds)
		if err != nil {
			return nil, nil, err
		}
		cID = cds.ChaincodeSpec.ChaincodeID
		cMsg = cds.ChaincodeSpec.CtorMsg
		cLang = cds.ChaincodeSpec.Type
		initargs = cMsg.Args
	} else if t.Type == pb.Transaction_CHAINCODE_INVOKE || t.Type == pb.Transaction_CHAINCODE_QUERY {
		ci := &pb.ChaincodeInvocationSpec{}
		err := proto.Unmarshal(t.Payload, ci)
		if err != nil {
			return nil, nil, err
		}
		cID = ci.ChaincodeSpec.ChaincodeID
		cMsg = ci.ChaincodeSpec.CtorMsg
	} else {
		chaincodeSupport.runningChaincodes.Unlock()
		return nil, nil, fmt.Errorf("invalid transaction type: %d", t.Type)
	}
	chaincode := cID.Name
	chaincodeSupport.runningChaincodes.Lock()
	var chrte *chaincodeRTEnv
	var ok bool
	var err error
	//if its in the map, there must be a connected stream...nothing to do
	if chrte, ok = chaincodeSupport.chaincodeHasBeenLaunched(chaincode); ok {
		if !chrte.handler.registered {
			chaincodeSupport.runningChaincodes.Unlock()
			chaincodeLogger.Debugf("premature execution - chaincode (%s) is being launched", chaincode)
			err = fmt.Errorf("premature execution - chaincode (%s) is being launched", chaincode)
			return cID, cMsg, err
		}
		if chrte.handler.isRunning() {
			chaincodeLogger.Debugf("chaincode is running(no need to launch) : %s", chaincode)
			chaincodeSupport.runningChaincodes.Unlock()
			return cID, cMsg, nil
		}
		chaincodeLogger.Debugf("Container not in READY state(%s)...send init/ready", chrte.handler.FSM.Current())
	}
	chaincodeSupport.runningChaincodes.Unlock()

	var depTx *pb.Transaction

	//extract depTx so we can initialize hander.deployTXSecContext
	//we need it only after container is launched and only if this is not a deploy tx
	//NOTE: ideally this section should be moved before just before sendInitOrReady where
	//      where we need depTx.  However, as we don't check for ExecuteTransactions failure
	//      in consensus/helper, the following race is not resolved:
	//         1) deploy creates image
	//         2) query launches chaincode
	//         3) deploy returns "premature execution" error
	//         4) error ignored and deploy committed
	//         5) query successfully retrives committed tx and calls sendInitOrReady
	// See issue #710

	if t.Type != pb.Transaction_CHAINCODE_DEPLOY {
		ledger, ledgerErr := ledger.GetLedger()

		if chaincodeSupport.userRunsCC {
			chaincodeLogger.Error("You are attempting to perform an action other than Deploy on Chaincode that is not ready and you are in developer mode. Did you forget to Deploy your chaincode?")
		}

		if ledgerErr != nil {
			return cID, cMsg, fmt.Errorf("Failed to get handle to ledger (%s)", ledgerErr)
		}

		//hopefully we are restarting from existing image and the deployed transaction exists
		depTx, ledgerErr = ledger.GetTransactionByID(chaincode)
		if ledgerErr != nil {
			return cID, cMsg, fmt.Errorf("Could not get deployment transaction for %s - %s", chaincode, ledgerErr)
		}
		if depTx == nil {
			return cID, cMsg, fmt.Errorf("deployment transaction does not exist for %s", chaincode)
		}
		if nil != chaincodeSupport.secHelper {
			var err error
			depTx, err = chaincodeSupport.secHelper.TransactionPreExecution(depTx)
			// Note that t is now decrypted and is a deep clone of the original input t
			if nil != err {
				return cID, cMsg, fmt.Errorf("failed tx preexecution%s - %s", chaincode, err)
			}
		}
		//Get lang from original deployment
		err := proto.Unmarshal(depTx.Payload, cds)
		if err != nil {
			return cID, cMsg, fmt.Errorf("failed to unmarshal deployment transactions for %s - %s", chaincode, err)
		}
		cLang = cds.ChaincodeSpec.Type
	}

	//from here on : if we launch the container and get an error, we need to stop the container

	//launch container if it is a System container or not in dev mode
	if (!chaincodeSupport.userRunsCC || cds.ExecEnv == pb.ChaincodeDeploymentSpec_SYSTEM) && (chrte == nil || chrte.handler == nil) {
		var targz io.Reader = bytes.NewBuffer(cds.CodePackage)
		_, err = chaincodeSupport.launchAndWaitForRegister(context, cds, cID, t.Txid, cLang, targz)
		if err != nil {
			chaincodeLogger.Errorf("launchAndWaitForRegister failed %s", err)
			return cID, cMsg, err
		}
	}

	if err == nil {
		//send init (if (args)) and wait for ready state
		err = chaincodeSupport.sendInitOrReady(context, t.Txid, chaincode, initargs, chaincodeSupport.ccStartupTimeout, t, depTx)
		if err != nil {
			chaincodeLogger.Errorf("sending init failed(%s)", err)
			err = fmt.Errorf("Failed to init chaincode(%s)", err)
			errIgnore := chaincodeSupport.Stop(context, cds)
			if errIgnore != nil {
				chaincodeLogger.Errorf("stop failed %s(%s)", errIgnore, err)
			}
		}
		chaincodeLogger.Debug("sending init completed")
	}

	chaincodeLogger.Debug("LaunchChaincode complete")

	return cID, cMsg, err
}

// getSecHelper returns the security help set from NewChaincodeSupport
func (chaincodeSupport *ChaincodeSupport) getSecHelper() crypto.Peer {
	return chaincodeSupport.secHelper
}

//getVMType - just returns a string for now. Another possibility is to use a factory method to
//return a VM executor
func (chaincodeSupport *ChaincodeSupport) getVMType(cds *pb.ChaincodeDeploymentSpec) (string, error) {
	if cds.ExecEnv == pb.ChaincodeDeploymentSpec_SYSTEM {
		return container.SYSTEM, nil
	}
	return container.DOCKER, nil
}

// Deploy deploys the chaincode if not in development mode where user is running the chaincode.
func (chaincodeSupport *ChaincodeSupport) Deploy(context context.Context, t *pb.Transaction) (*pb.ChaincodeDeploymentSpec, error) {
	//build the chaincode
	cds := &pb.ChaincodeDeploymentSpec{}
	err := proto.Unmarshal(t.Payload, cds)
	if err != nil {
		return nil, err
	}
	cID := cds.ChaincodeSpec.ChaincodeID
	cLang := cds.ChaincodeSpec.Type
	chaincode := cID.Name
	if err != nil {
		return cds, err
	}

	if chaincodeSupport.userRunsCC {
		chaincodeLogger.Debug("user runs chaincode, not deploying chaincode")
		return nil, nil
	}

	chaincodeSupport.runningChaincodes.Lock()
	//if its in the map, there must be a connected stream...and we are trying to build the code ?!
	if _, ok := chaincodeSupport.chaincodeHasBeenLaunched(chaincode); ok {
		chaincodeLogger.Debugf("deploy ?!! there's a chaincode with that name running: %s", chaincode)
		chaincodeSupport.runningChaincodes.Unlock()
		return cds, fmt.Errorf("deploy attempted but a chaincode with same name running %s", chaincode)
	}
	chaincodeSupport.runningChaincodes.Unlock()

	args, envs, err := chaincodeSupport.getArgsAndEnv(cID, cLang)
	if err != nil {
		return cds, fmt.Errorf("error getting args for chaincode %s", err)
	}

	var targz io.Reader = bytes.NewBuffer(cds.CodePackage)
	cir := &container.CreateImageReq{CCID: ccintf.CCID{ChaincodeSpec: cds.ChaincodeSpec, NetworkID: chaincodeSupport.peerNetworkID, PeerID: chaincodeSupport.peerID}, Args: args, Reader: targz, Env: envs}

	vmtype, _ := chaincodeSupport.getVMType(cds)

	chaincodeLogger.Debugf("deploying chaincode %s(networkid:%s,peerid:%s)", chaincode, chaincodeSupport.peerNetworkID, chaincodeSupport.peerID)

	//create image and create container
	_, err = container.VMCProcess(context, vmtype, cir)
	if err != nil {
		err = fmt.Errorf("Error starting container: %s", err)
	}

	return cds, err
}

// HandleChaincodeStream implements ccintf.HandleChaincodeStream for all vms to call with appropriate stream
func (chaincodeSupport *ChaincodeSupport) HandleChaincodeStream(ctxt context.Context, stream ccintf.ChaincodeStream) error {
	return HandleChaincodeStream(chaincodeSupport, ctxt, stream)
}

// Register the bidi stream entry point called by chaincode to register with the Peer.
func (chaincodeSupport *ChaincodeSupport) Register(stream pb.ChaincodeSupport_RegisterServer) error {
	return chaincodeSupport.HandleChaincodeStream(stream.Context(), stream)
}

// createTransactionMessage creates a transaction message.
func createTransactionMessage(txid string, cMsg *pb.ChaincodeInput) (*pb.ChaincodeMessage, error) {
	payload, err := proto.Marshal(cMsg)
	if err != nil {
		fmt.Printf(err.Error())
		return nil, err
	}
	return &pb.ChaincodeMessage{Type: pb.ChaincodeMessage_TRANSACTION, Payload: payload, Txid: txid}, nil
}

// createQueryMessage creates a query message.
func createQueryMessage(txid string, cMsg *pb.ChaincodeInput) (*pb.ChaincodeMessage, error) {
	payload, err := proto.Marshal(cMsg)
	if err != nil {
		return nil, err
	}
	return &pb.ChaincodeMessage{Type: pb.ChaincodeMessage_QUERY, Payload: payload, Txid: txid}, nil
}

// Execute executes a transaction and waits for it to complete until a timeout value.
func (chaincodeSupport *ChaincodeSupport) Execute(ctxt context.Context, chaincode string, msg *pb.ChaincodeMessage, timeout time.Duration, tx *pb.Transaction) (*pb.ChaincodeMessage, error) {
	chaincodeSupport.runningChaincodes.Lock()
	//we expect the chaincode to be running... sanity check
	chrte, ok := chaincodeSupport.chaincodeHasBeenLaunched(chaincode)
	if !ok {
		chaincodeSupport.runningChaincodes.Unlock()
		chaincodeLogger.Debugf("cannot execute-chaincode is not running: %s", chaincode)
		return nil, fmt.Errorf("Cannot execute transaction or query for %s", chaincode)
	}
	chaincodeSupport.runningChaincodes.Unlock()

	var notfy chan *pb.ChaincodeMessage
	var err error
	if notfy, err = chrte.handler.sendExecuteMessage(msg, tx); err != nil {
		return nil, fmt.Errorf("Error sending %s: %s", msg.Type.String(), err)
	}
	var ccresp *pb.ChaincodeMessage
	select {
	case ccresp = <-notfy:
		//response is sent to user or calling chaincode. ChaincodeMessage_ERROR and ChaincodeMessage_QUERY_ERROR
		//are typically treated as error
	case <-time.After(timeout):
		err = fmt.Errorf("Timeout expired while executing transaction")
	}

	//our responsibility to delete transaction context if sendExecuteMessage succeeded
	chrte.handler.deleteTxContext(msg.Txid)

	return ccresp, err
}