func (t *SimpleChaincode) transfer(stub *shim.ChaincodeStub, args []string) ([]byte, error) {
var v Vehicle
var err error
var bytes []byte
bytes, err = stub.GetState(args[0])
if err != nil {
return nil, errors.New("Error retrieving vehicle with v5cID = " + args[0])
}
err = json.Unmarshal(bytes, &v)
if err != nil {
return nil, errors.New("Corrupt vehicle record")
}
v.Owner = args[1]
bytes, err = json.Marshal(v)
if err != nil {
return nil, errors.New("Error creating vehicle record")
}
err = stub.PutState(v.V5cID, bytes)
if err != nil {
return nil, err
}
return nil, nil
}
// ============================================================================================================================
// Init - reset all the things
// ============================================================================================================================
func (t *SimpleChaincode) init(stub *shim.ChaincodeStub, args []string) ([]byte, error) {
var Aval int
var err error
if len(args) != 1 {
return nil, errors.New("Incorrect number of arguments. Expecting 1")
}
// Initialize the chaincode
Aval, err = strconv.Atoi(args[0])
if err != nil {
return nil, errors.New("Expecting integer value for asset holding")
}
// Write the state to the ledger
err = stub.PutState("abc", []byte(strconv.Itoa(Aval))) //making a test var "abc", I find it handy to read/write to it right away to test the network
if err != nil {
return nil, err
}
var empty []string
jsonAsBytes, _ := json.Marshal(empty) //marshal an emtpy array of strings to clear the index
err = stub.PutState(marbleIndexStr, jsonAsBytes)
if err != nil {
return nil, err
}
return nil, nil
}
func (t *SimpleChaincode) init(stub *shim.ChaincodeStub, args []string) ([]byte, error) {
var A string // Entity
var Aval int // Asset holding
var err error
if len(args) != 2 {
return nil, errors.New("Incorrect number of arguments. Expecting 2")
}
// Initialize the chaincode
A = args[0]
Aval, err = strconv.Atoi(args[1])
if err != nil {
return nil, errors.New("Expecting integer value for asset holding")
}
fmt.Printf("Aval = %d\n", Aval)
// Write the state to the ledger - this put is legal within Run
err = stub.PutState(A, []byte(strconv.Itoa(Aval)))
if err != nil {
return nil, err
}
return nil, nil
}
func (t *Vehicle) update_registration(stub *shim.ChaincodeStub, args []string) ([]byte, error) {
regBytes, err := stub.GetState("Reg")
reg := string(regBytes)
if err != nil {
return nil, errors.New("Failed to get state")
}
statusBytes, err := stub.GetState("Status")
status, err := strconv.Atoi(string(statusBytes))
if err != nil {
return nil, errors.New("Failed to get state")
}
if status == 1 || status == 2 {
reg = args[0]
} else {
return nil, errors.New("Permission denied")
}
err = stub.PutState("Reg", []byte(reg))
return nil, nil
}
// Initialize entities to random variables in order to test ledger status consensus
func (t *SimpleChaincode) initRand(stub *shim.ChaincodeStub, args []string) ([]byte, error) {
var A, B string // Entities
var Aval, Bval int // Asset holdings
var err error
if len(args) != 4 {
return nil, errors.New("Incorrect number of arguments. Expecting 4")
}
// Initialize the chaincode
A = args[0]
Aval = rand.Intn(100)
B = args[1]
Bval = rand.Intn(100)
fmt.Printf("Aval = %d, Bval = %d\n", Aval, Bval)
// Write the state to the ledger
err = stub.PutState(A, []byte(strconv.Itoa(Aval)))
if err != nil {
return nil, err
}
err = stub.PutState(B, []byte(strconv.Itoa(Bval)))
if err != nil {
return nil, err
}
return nil, nil
}
// ============================================================================================================================
// Delete - remove a key/value pair from state
// ============================================================================================================================
func (t *SimpleChaincode) Delete(stub *shim.ChaincodeStub, args []string) ([]byte, error) {
if len(args) != 1 {
return nil, errors.New("Incorrect number of arguments. Expecting 1")
}
name := args[0]
err := stub.DelState(name) //remove the key from chaincode state
if err != nil {
return nil, errors.New("Failed to delete state")
}
//get the marble index
marblesAsBytes, err := stub.GetState(marbleIndexStr)
if err != nil {
return nil, errors.New("Failed to get marble index")
}
var marbleIndex []string
json.Unmarshal(marblesAsBytes, &marbleIndex) //un stringify it aka JSON.parse()
//remove marble from index
for i, val := range marbleIndex {
fmt.Println(strconv.Itoa(i) + " - looking at " + val + " for " + name)
if val == name { //find the correct marble
fmt.Println("found marble")
marbleIndex = append(marbleIndex[:i], marbleIndex[i+1:]...) //remove it
for x := range marbleIndex { //debug prints...
fmt.Println(string(x) + " - " + marbleIndex[x])
}
break
}
}
jsonAsBytes, _ := json.Marshal(marbleIndex) //save new index
err = stub.PutState(marbleIndexStr, jsonAsBytes)
return nil, nil
}
func (t *Vehicle) update_model(stub *shim.ChaincodeStub, args []string) ([]byte, error) {
modelBytes, err := stub.GetState("Model")
model := string(modelBytes)
if err != nil {
return nil, errors.New("Failed to get state")
}
statusBytes, err := stub.GetState("Status")
status, err := strconv.Atoi(string(statusBytes))
if err != nil {
return nil, errors.New("Failed to get state")
}
ownerBytes, err := stub.GetState("Owner")
owner := string(ownerBytes)
if err != nil {
return nil, errors.New("Failed to get state")
}
if status == 1 && owner == "Toyota" {
model = args[0]
} else {
return nil, errors.New("Permission denied")
}
err = stub.PutState("Model", []byte(model))
return nil, nil
}
func (t *SimpleChaincode) init(stub *shim.ChaincodeStub, args []string) ([]byte, error) {
var event string // Indicates whether event has happened. Initially 0
var eventVal int // State of event
var err error
if len(args) != 2 {
return nil, errors.New("Incorrect number of arguments. Expecting 2")
}
// Initialize the chaincode
event = args[0]
eventVal, err = strconv.Atoi(args[1])
if err != nil {
return nil, errors.New("Expecting integer value for event status")
}
fmt.Printf("eventVal = %d\n", eventVal)
// Write the state to the ledger
err = stub.PutState(event, []byte(strconv.Itoa(eventVal)))
if err != nil {
return nil, err
}
return nil, nil
}
// Query callback representing the query of a chaincode
func (t *SimpleChaincode) Query(stub *shim.ChaincodeStub, function string, args []string) ([]byte, error) {
if function == "getstring" {
return t.getstring(stub, args)
} else if function != "query" {
return nil, errors.New("Invalid query function name. Expecting \"query\"")
}
var A string // Entity
var Aval int // Asset holding
var err error
if len(args) != 2 {
return nil, errors.New("Incorrect number of arguments. Expecting 2")
}
A = args[0]
Aval, err = strconv.Atoi(args[1])
if err != nil {
return nil, errors.New("Expecting integer value for asset holding")
}
fmt.Printf("Aval = %d\n", Aval)
// Write the state to the ledger - this put is illegal within Run
err = stub.PutState(A, []byte(strconv.Itoa(Aval)))
if err != nil {
jsonResp := "{\"Error\":\"Cannot put state within chaincode query\"}"
return nil, errors.New(jsonResp)
}
fmt.Printf("Something is wrong. This query should not have succeeded")
return nil, nil
}
// ============================================================================================================================
// Set User Permission on Marble
// ============================================================================================================================
func (t *SimpleChaincode) set_user(stub *shim.ChaincodeStub, args []string) ([]byte, error) {
var err error
// 0 1
// "name", "bob"
if len(args) < 2 {
return nil, errors.New("Incorrect number of arguments. Expecting 2")
}
fmt.Println("- start set user")
fmt.Println(args[0] + " - " + args[1])
marbleAsBytes, err := stub.GetState(args[0])
if err != nil {
return nil, errors.New("Failed to get thing")
}
res := Marble{}
json.Unmarshal(marbleAsBytes, &res) //un stringify it aka JSON.parse()
res.User = args[1] //change the user
jsonAsBytes, _ := json.Marshal(res)
err = stub.PutState(args[0], jsonAsBytes) //rewrite the marble with id as key
if err != nil {
return nil, err
}
fmt.Println("- end set user")
return nil, nil
}
func (t *AssetManagementChaincode) init(stub *shim.ChaincodeStub, args []string) ([]byte, error) {
myLogger.Info("[AssetManagementChaincode] Init")
if len(args) != 0 {
return nil, errors.New("Incorrect number of arguments. Expecting 0")
}
// Create ownership table
err := stub.CreateTable("AssetsOwnership", []*shim.ColumnDefinition{
&shim.ColumnDefinition{"Asset", shim.ColumnDefinition_STRING, true},
&shim.ColumnDefinition{"Owner", shim.ColumnDefinition_BYTES, false},
})
if err != nil {
return nil, errors.New("Failed creating AssetsOnwership table.")
}
// Set the admin
// The metadata will contain the certificate of the administrator
adminCert, err := stub.GetCallerMetadata()
if err != nil {
return nil, errors.New("Failed getting metadata.")
}
if len(adminCert) == 0 {
return nil, errors.New("Invalid admin certificate. Empty.")
}
stub.PutState("admin", adminCert)
return nil, nil
}
func (t *SimpleChaincode) init(stub *shim.ChaincodeStub, args []string) ([]byte, error) {
var sum string // Sum of asset holdings across accounts. Initially 0
var sumVal int // Sum of holdings
var err error
if len(args) != 2 {
return nil, errors.New("Incorrect number of arguments. Expecting 2")
}
// Initialize the chaincode
sum = args[0]
sumVal, err = strconv.Atoi(args[1])
if err != nil {
return nil, errors.New("Expecting integer value for sum")
}
fmt.Printf("sumVal = %d\n", sumVal)
// Write the state to the ledger
err = stub.PutState(sum, []byte(strconv.Itoa(sumVal)))
if err != nil {
return nil, err
}
return nil, nil
}
// ============================================================================================================================
// Init Car
// ============================================================================================================================
func (t *SimpleChaincode) init_car(stub *shim.ChaincodeStub, args []string) ([]byte, error) {
var err error
if len(args) != 5 {
return nil, errors.New("Incorrect number of arguments. Expecting 5")
}
str := `{
"data": {
"vin": "` + args[0] + `",
"year": "` + args[1] + `"
"make": "` + args[2] + `",
"model": "` + args[3] + `",
"license": "-"
},
"users": [{
"userid": "` + args[4] + `",
"permissions":["owner"]
}]
}`
// Write the state back to the ledger
err = stub.PutState(args[0], []byte(str)) //store car with vin# as key
if err != nil {
return nil, err
}
t.remember_me(stub, args[0])
return nil, nil
}
// ============================================================================================================================
// Set User Permissions
// ============================================================================================================================
func (t *SimpleChaincode) set_user_perms(stub *shim.ChaincodeStub, args []string) ([]byte, error) {
var err error
carAsBytes, err := stub.GetState(args[0])
if err != nil {
return nil, errors.New("Failed to get car profile")
}
res := Car{}
json.Unmarshal(carAsBytes, &res)
fmt.Println(res)
for i, perm := range res.Users {
if perm.UserId == args[1] { //find the correct user
res.Users[i].Permissions[0] = args[2] //set new perm, dsh - to do make this input as array of all perms
fmt.Println(res.Users[i].Permissions)
break
}
}
// Write the state back to the ledger
jsonAsBytes, _ := json.Marshal(res)
err = stub.PutState(args[0], jsonAsBytes)
if err != nil {
return nil, err
}
return nil, nil
}
func (t *Vehicle) update_colour(stub *shim.ChaincodeStub, args []string) ([]byte, error) {
colourBytes, err := stub.GetState("Colour")
colour := string(colourBytes)
if err != nil {
return nil, errors.New("Failed to get state")
}
statusBytes, err := stub.GetState("Status")
status, err := strconv.Atoi(string(statusBytes))
if err != nil {
return nil, errors.New("Failed to get state")
}
if status == 1 || status == 2 {
colour = args[0]
} else {
return nil, errors.New("Permission denied")
}
err = stub.PutState("Colour", []byte(colour))
return nil, nil
}
func (t *Vehicle) scrap_merchant_to_scrap(stub *shim.ChaincodeStub, args []string) ([]byte, error) {
statusBytes, err := stub.GetState("Status")
status, err := strconv.Atoi(string(statusBytes))
if err != nil {
return nil, errors.New("Failed to get state")
}
scrappedBytes, err := stub.GetState("Scrapped")
scrapped, err := strconv.ParseBool(string(scrappedBytes))
if err != nil {
return nil, errors.New("Failed to get state")
}
ownerBytes, err := stub.GetState("Owner")
owner := string(ownerBytes)
if err != nil {
return nil, errors.New("Failed to get state")
}
if !scrapped && owner == "Cray Bros (London) Ltd" && status == 4 {
scrapped = true
} else {
return nil, errors.New("Permission denied")
}
err = stub.PutState("Scrapped", []byte(strconv.FormatBool(scrapped)))
return nil, nil
}
func (t *Vehicle) lease_company_to_private(stub *shim.ChaincodeStub, args []string) ([]byte, error) {
statusBytes, err := stub.GetState("Status")
status, err := strconv.Atoi(string(statusBytes))
if err != nil {
return nil, errors.New("Failed to get state")
}
ownerBytes, err := stub.GetState("Owner")
owner := string(ownerBytes)
if err != nil {
return nil, errors.New("Failed to get state")
}
scrappedBytes, err := stub.GetState("Scrapped")
scrapped, err := strconv.ParseBool(string(scrappedBytes))
if err != nil {
return nil, errors.New("Failed to get state")
}
if status == 2 && owner == "LeaseCan" && !scrapped {
owner = args[0]
} else {
return nil, errors.New("Permission denied")
}
err = stub.PutState("Owner", []byte(owner))
return nil, nil
}
// Transaction queries another chaincode and updates its own state
func (t *SimpleChaincode) invoke(stub *shim.ChaincodeStub, args []string) ([]byte, error) {
var sum string // Sum entity
var Aval, Bval, sumVal int // value of sum entity - to be computed
var err error
if len(args) != 3 {
return nil, errors.New("Incorrect number of arguments. Expecting 3")
}
chaincodeUrl := args[0] // Expecting "github.com/openblockchain/obc-peer/openchain/example/chaincode/chaincode_example02"
chaincodeVersion := args[1] // Expecting "0.0.1"
sum = args[2]
// Query chaincode_example02
f := "query"
queryArgs := []string{"a"}
response, err := stub.QueryChaincode(chaincodeUrl, chaincodeVersion, f, queryArgs)
if err != nil {
errStr := fmt.Sprintf("Failed to query chaincode. Got error: %s", err.Error())
fmt.Printf(errStr)
return nil, errors.New(errStr)
}
Aval, err = strconv.Atoi(string(response))
if err != nil {
errStr := fmt.Sprintf("Error retrieving state from ledger for queried chaincode: %s", err.Error())
fmt.Printf(errStr)
return nil, errors.New(errStr)
}
queryArgs = []string{"b"}
response, err = stub.QueryChaincode(chaincodeUrl, chaincodeVersion, f, queryArgs)
if err != nil {
errStr := fmt.Sprintf("Failed to query chaincode. Got error: %s", err.Error())
fmt.Printf(errStr)
return nil, errors.New(errStr)
}
Bval, err = strconv.Atoi(string(response))
if err != nil {
errStr := fmt.Sprintf("Error retrieving state from ledger for queried chaincode: %s", err.Error())
fmt.Printf(errStr)
return nil, errors.New(errStr)
}
// Compute sum
sumVal = Aval + Bval
// Write sumVal back to the ledger
err = stub.PutState(sum, []byte(strconv.Itoa(sumVal)))
if err != nil {
return nil, err
}
fmt.Printf("Invoke chaincode successful. Got sum %d\n", sumVal)
return []byte(strconv.Itoa(sumVal)), nil
}
// ============================================================================================================================
// Init Marble - create a new marble, store into chaincode state
// ============================================================================================================================
func (t *SimpleChaincode) init_marble(stub *shim.ChaincodeStub, args []string) ([]byte, error) {
var err error
// 0 1 2 3
// "asdf", "blue", "35", "bob"
if len(args) != 4 {
return nil, errors.New("Incorrect number of arguments. Expecting 4")
}
fmt.Println("- start init marble")
if len(args[0]) <= 0 {
return nil, errors.New("1st argument must be a non-empty string")
}
if len(args[1]) <= 0 {
return nil, errors.New("2nd argument must be a non-empty string")
}
if len(args[2]) <= 0 {
return nil, errors.New("3rd argument must be a non-empty string")
}
if len(args[3]) <= 0 {
return nil, errors.New("4th argument must be a non-empty string")
}
size, err := strconv.Atoi(args[2])
if err != nil {
return nil, errors.New("3rd argument must be a numeric string")
}
color := strings.ToLower(args[1])
user := strings.ToLower(args[3])
str := `{"name": "` + args[0] + `", "color": "` + color + `", "size": ` + strconv.Itoa(size) + `, "user": "******"}`
err = stub.PutState(args[0], []byte(str)) //store marble with id as key
if err != nil {
return nil, err
}
//get the marble index
marblesAsBytes, err := stub.GetState(marbleIndexStr)
if err != nil {
return nil, errors.New("Failed to get marble index")
}
var marbleIndex []string
json.Unmarshal(marblesAsBytes, &marbleIndex) //un stringify it aka JSON.parse()
//append
marbleIndex = append(marbleIndex, args[0]) //add marble name to index list
fmt.Println("! marble index: ", marbleIndex)
jsonAsBytes, _ := json.Marshal(marbleIndex)
err = stub.PutState(marbleIndexStr, jsonAsBytes) //store name of marble
fmt.Println("- end init marble")
return nil, nil
}
// Initialize the in the ledger (this needs to be run only once!!!!)
func (t *systemChaincode) init(stub *shim.ChaincodeStub, args []string) ([]byte, error) {
var vp int64 = 0
// Initialize the validity period in the ledger (this needs to be run only once!!!!)
err := stub.PutState(system_validity_period_key, []byte(strconv.FormatInt(vp, 10)))
if err != nil {
return nil, err
}
return nil, nil
}
func (t *SimpleChaincode) test(stub *shim.ChaincodeStub, args []string) ([]byte, error) {
var err error
// Write the state back to the ledger
str := "hey there"
err = stub.PutState("test", []byte(str))
if err != nil {
return nil, err
}
return nil, nil
}
// Transaction makes payment of X units from A to B
func (t *SimpleChaincode) invoke(stub *shim.ChaincodeStub, args []string) ([]byte, error) {
var A, B string // Entities
var Aval, Bval int // Asset holdings
var X int // Transaction value
var err error
if len(args) != 3 {
return nil, errors.New("Incorrect number of arguments. Expecting 3")
}
A = args[0]
B = args[1]
// Get the state from the ledger
// TODO: will be nice to have a GetAllState call to ledger
Avalbytes, err := stub.GetState(A)
if err != nil {
return nil, errors.New("Failed to get state")
}
if Avalbytes == nil {
return nil, errors.New("Entity not found")
}
Aval, _ = strconv.Atoi(string(Avalbytes))
Bvalbytes, err := stub.GetState(B)
if err != nil {
return nil, errors.New("Failed to get state")
}
if Avalbytes == nil {
return nil, errors.New("Entity not found")
}
Bval, _ = strconv.Atoi(string(Bvalbytes))
// Perform the execution
X, err = strconv.Atoi(args[2])
Aval = Aval - X
Bval = Bval + X
fmt.Printf("Aval = %d, Bval = %d\n", Aval, Bval)
// Write the state back to the ledger
err = stub.PutState(A, []byte(strconv.Itoa(Aval)))
if err != nil {
return nil, err
}
err = stub.PutState(B, []byte(strconv.Itoa(Bval)))
if err != nil {
return nil, err
}
return nil, nil
}
// ============================================================================================================================
// Init TEST
// ============================================================================================================================
func (t *SimpleChaincode) init_test(stub *shim.ChaincodeStub, args []string) ([]byte, error) {
var err error
str := `{"userid": "test", "fullname": "mr test"}`
// Write the state back to the ledger
err = stub.PutState("test", []byte(str))
if err != nil {
return nil, err
}
t.remember_me(stub, "test")
return nil, nil
}
//==============================================================================================================================
// save_changes - Writes to the ledger the Vehicle struct passed in a JSON format. Uses the shim file's
// method 'PutState'.
//==============================================================================================================================
func (t *Chaincode) save_changes(stub *shim.ChaincodeStub, v Vehicle) (bool, error) {
bytes, err := json.Marshal(v)
if err != nil {
return false, errors.New("Error creating vehicle record")
}
err = stub.PutState(v.V5cID, bytes)
if err != nil {
return false, err
}
return true, nil
}
// ============================================================================================================================
// Init TEST
// ============================================================================================================================
func (t *SimpleChaincode) Test(stub *shim.ChaincodeStub, args []string) ([]byte, error) {
var err error
fmt.Println("run Test - start")
//str := "\"{\"userid\": \"test\", \"fullname\": \"mr test\"}"
str := "what is going on here"
// Write the state back to the ledger
err = stub.PutState("test", []byte(str))
if err != nil {
return nil, err
}
t.remember_me(stub, "test")
fmt.Println("run Test - fin")
return nil, nil
}
// ============================================================================================================================
// Remember Me - remember the name of variables we stored in ledger
// ============================================================================================================================
func (t *SimpleChaincode) remember_me(stub *shim.ChaincodeStub, name string) ([]byte, error) { //dsh - to do, should probably not exist here, move to stub
var err error
var ben = "_ben_knows"
var storedNames string
storeNamesAsBytes, err := stub.GetState(ben)
if err != nil {
return nil, errors.New("Failed to get ben")
}
storedNames = string(storeNamesAsBytes)
// Write the state back to the ledger
err = stub.PutState(ben, []byte(storedNames+","+name)) //dsh - to do, should probably be json
if err != nil {
return nil, err
}
return nil, nil
}
func writeMortgageState(stub *shim.ChaincodeStub, state map[string]interface{}) ([]byte, error) {
// Write updated state back to ledger
bytes, err := json.Marshal(state)
if err != nil {
return bytes, err
}
//fmt.Printf("State: " + string(bytes) + "\n")
fmt.Printf("Writing mortgage state to shared ledger...\n")
err = stub.PutState("myMortgageState", bytes)
if err != nil {
return bytes, myError("Failed to write mortgage state to ledger")
//return bytes, err
}
return bytes, nil
}
// ============================================================================================================================
// Write - write variable into chaincode state
// ============================================================================================================================
func (t *SimpleChaincode) Write(stub *shim.ChaincodeStub, args []string) ([]byte, error) {
var name, value string // Entities
var err error
fmt.Println("running write()")
if len(args) != 2 {
return nil, errors.New("Incorrect number of arguments. Expecting 2. name of the variable and value to set")
}
name = args[0] //rename for funsies
value = args[1]
err = stub.PutState(name, []byte(value)) //write the variable into the chaincode state
if err != nil {
return nil, err
}
return nil, nil
}
// Transaction invokes another chaincode and changes event state
func (t *SimpleChaincode) invoke(stub *shim.ChaincodeStub, args []string) ([]byte, error) {
var event string // Event entity
var eventVal int // State of event
var err error
if len(args) != 2 {
return nil, errors.New("Incorrect number of arguments. Expecting 2")
}
event = args[0]
eventVal, err = strconv.Atoi(args[1])
if err != nil {
return nil, errors.New("Expected integer value for event state change")
}
if eventVal != 1 {
fmt.Printf("Unexpected event. Doing nothing\n")
return nil, nil
}
// Get the chaincode to call from the ledger
chainCodeToCall, err := t.getChaincodeToCall(stub)
if err != nil {
return nil, err
}
f := "invoke"
invokeArgs := []string{"a", "b", "10"}
response, err := stub.InvokeChaincode(chainCodeToCall, f, invokeArgs)
if err != nil {
errStr := fmt.Sprintf("Failed to invoke chaincode. Got error: %s", err.Error())
fmt.Printf(errStr)
return nil, errors.New(errStr)
}
fmt.Printf("Invoke chaincode successful. Got response %s", string(response))
// Write the event state back to the ledger
err = stub.PutState(event, []byte(strconv.Itoa(eventVal)))
if err != nil {
return nil, err
}
return nil, nil
}
//----------------------------------------------------------------------------------------------------------------------------------
// Write var into chaincode state
func (t *SimpleChaincode) Write(stub *shim.ChaincodeStub, args []string) ([]byte, error) {
var name string // Entities
var err error
if len(args) != 2 {
return nil, errors.New("Incorrect number of arguments. Expecting name of the variable and value to set")
}
name = args[0]
// Write the state back to the ledger
err = stub.PutState(name, []byte(args[1]))
if err != nil {
return nil, err
}
return nil, nil
}