From 429f087c5a2aa3f617ff4adc54349417d3554097 Mon Sep 17 00:00:00 2001 From: Andrew Hurt Date: Wed, 30 Oct 2019 09:34:23 +0000 Subject: [PATCH] update fabcar go to new programming model Signed-off-by: Andrew Hurt --- chaincode/fabcar/go/fabcar.go | 178 ++++++++++++++-------------------- chaincode/fabcar/go/go.mod | 12 +-- chaincode/fabcar/go/go.sum | 127 ++++++++++++++++-------- 3 files changed, 163 insertions(+), 154 deletions(-) diff --git a/chaincode/fabcar/go/fabcar.go b/chaincode/fabcar/go/fabcar.go index 7a7c70bec3..1d1346bea6 100644 --- a/chaincode/fabcar/go/fabcar.go +++ b/chaincode/fabcar/go/fabcar.go @@ -17,32 +17,22 @@ * under the License. */ -/* - * The sample smart contract for documentation topic: - * Writing Your First Blockchain Application - */ - package main -/* Imports - * 4 utility libraries for formatting, handling bytes, reading and writing JSON, and string manipulation - * 2 specific Hyperledger Fabric specific libraries for Smart Contracts - */ import ( - "bytes" "encoding/json" "fmt" "strconv" - "github.com/hyperledger/fabric-chaincode-go/shim" - pb "github.com/hyperledger/fabric-protos-go/peer" + "github.com/hyperledger/fabric-contract-api-go/contractapi" ) -// Define the Smart Contract structure +// SmartContract provides functions for managing a car type SmartContract struct { + contractapi.Contract } -// Define the car structure, with 4 properties. Structure tags are used by encoding/json library +// Car describes basic details of what makes up a car type Car struct { Make string `json:"make"` Model string `json:"model"` @@ -50,49 +40,14 @@ type Car struct { Owner string `json:"owner"` } -/* - * The Init method is called when the Smart Contract "fabcar" is instantiated by the blockchain network - * Best practice is to have any Ledger initialization in separate function -- see initLedger() - */ -func (s *SmartContract) Init(APIstub shim.ChaincodeStubInterface) pb.Response { - return shim.Success(nil) +// QueryResult structure used for handling result of query +type QueryResult struct { + Key string `json:"Key"` + Record *Car } -/* - * The Invoke method is called as a result of an application request to run the Smart Contract "fabcar" - * The calling application program has also specified the particular smart contract function to be called, with arguments - */ -func (s *SmartContract) Invoke(APIstub shim.ChaincodeStubInterface) pb.Response { - - // Retrieve the requested Smart Contract function and arguments - function, args := APIstub.GetFunctionAndParameters() - // Route to the appropriate handler function to interact with the ledger appropriately - if function == "queryCar" { - return s.queryCar(APIstub, args) - } else if function == "initLedger" { - return s.initLedger(APIstub) - } else if function == "createCar" { - return s.createCar(APIstub, args) - } else if function == "queryAllCars" { - return s.queryAllCars(APIstub) - } else if function == "changeCarOwner" { - return s.changeCarOwner(APIstub, args) - } - - return shim.Error("Invalid Smart Contract function name.") -} - -func (s *SmartContract) queryCar(APIstub shim.ChaincodeStubInterface, args []string) pb.Response { - - if len(args) != 1 { - return shim.Error("Incorrect number of arguments. Expecting 1") - } - - carAsBytes, _ := APIstub.GetState(args[0]) - return shim.Success(carAsBytes) -} - -func (s *SmartContract) initLedger(APIstub shim.ChaincodeStubInterface) pb.Response { +// InitLedger adds a base set of cars to the ledger +func (s *SmartContract) InitLedger(ctx contractapi.TransactionContextInterface) error { cars := []Car{ Car{Make: "Toyota", Model: "Prius", Colour: "blue", Owner: "Tomoko"}, Car{Make: "Ford", Model: "Mustang", Colour: "red", Owner: "Brad"}, @@ -107,94 +62,105 @@ func (s *SmartContract) initLedger(APIstub shim.ChaincodeStubInterface) pb.Respo } for i, car := range cars { - fmt.Println("i is ", i) carAsBytes, _ := json.Marshal(car) - APIstub.PutState("CAR"+strconv.Itoa(i), carAsBytes) - fmt.Println("Added", car) + err := ctx.GetStub().PutState("CAR"+strconv.Itoa(i), carAsBytes) + + if err != nil { + return fmt.Errorf("Failed to put to world state. %s", err.Error()) + } } - return shim.Success(nil) + return nil } -func (s *SmartContract) createCar(APIstub shim.ChaincodeStubInterface, args []string) pb.Response { - - if len(args) != 5 { - return shim.Error("Incorrect number of arguments. Expecting 5") +// CreateCar adds a new car to the world state with given details +func (s *SmartContract) CreateCar(ctx contractapi.TransactionContextInterface, carNumber string, make string, model string, colour string, owner string) error { + car := Car{ + Make: make, + Model: model, + Colour: colour, + Owner: owner, } - var car = Car{Make: args[1], Model: args[2], Colour: args[3], Owner: args[4]} - carAsBytes, _ := json.Marshal(car) - APIstub.PutState(args[0], carAsBytes) - return shim.Success(nil) + return ctx.GetStub().PutState(carNumber, carAsBytes) } -func (s *SmartContract) queryAllCars(APIstub shim.ChaincodeStubInterface) pb.Response { +// QueryCar returns the car stored in the world state with given id +func (s *SmartContract) QueryCar(ctx contractapi.TransactionContextInterface, carNumber string) (*Car, error) { + carAsBytes, err := ctx.GetStub().GetState(carNumber) + + if err != nil { + return nil, fmt.Errorf("Failed to read from world state. %s", err.Error()) + } + + if carAsBytes == nil { + return nil, fmt.Errorf("%s does not exist", carNumber) + } + + car := new(Car) + _ = json.Unmarshal(carAsBytes, car) + return car, nil +} + +// QueryAllCars returns all cars found in world state +func (s *SmartContract) QueryAllCars(ctx contractapi.TransactionContextInterface) ([]QueryResult, error) { startKey := "CAR0" - endKey := "CAR999" + endKey := "CAR99" + + resultsIterator, err := ctx.GetStub().GetStateByRange(startKey, endKey) - resultsIterator, err := APIstub.GetStateByRange(startKey, endKey) if err != nil { - return shim.Error(err.Error()) + return nil, err } defer resultsIterator.Close() - // buffer is a JSON array containing QueryResults - var buffer bytes.Buffer - buffer.WriteString("[") + results := []QueryResult{} - bArrayMemberAlreadyWritten := false for resultsIterator.HasNext() { queryResponse, err := resultsIterator.Next() + if err != nil { - return shim.Error(err.Error()) - } - // Add a comma before array members, suppress it for the first array member - if bArrayMemberAlreadyWritten { - buffer.WriteString(",") + return nil, err } - buffer.WriteString( - fmt.Sprintf( - `{"Key":"%s", "Record":%s}`, - queryResponse.Key, queryResponse.Value, - ), - ) - bArrayMemberAlreadyWritten = true - } - buffer.WriteString("]") + car := new(Car) + _ = json.Unmarshal(queryResponse.Value, car) - fmt.Printf("- queryAllCars:\n%s\n", buffer.String()) + queryResult := QueryResult{Key: queryResponse.Key, Record: car} + results = append(results, queryResult) + } - return shim.Success(buffer.Bytes()) + return results, nil } -func (s *SmartContract) changeCarOwner(APIstub shim.ChaincodeStubInterface, args []string) pb.Response { +// ChangeCarOwner updates the owner field of car with given id in world state +func (s *SmartContract) ChangeCarOwner(ctx contractapi.TransactionContextInterface, carNumber string, newOwner string) error { + car, err := s.QueryCar(ctx, carNumber) - if len(args) != 2 { - return shim.Error("Incorrect number of arguments. Expecting 2") + if err != nil { + return err } - carAsBytes, _ := APIstub.GetState(args[0]) - car := Car{} + car.Owner = newOwner - json.Unmarshal(carAsBytes, &car) - car.Owner = args[1] - - carAsBytes, _ = json.Marshal(car) - APIstub.PutState(args[0], carAsBytes) + carAsBytes, _ := json.Marshal(car) - return shim.Success(nil) + return ctx.GetStub().PutState(carNumber, carAsBytes) } -// The main function is only relevant in unit test mode. Only included here for completeness. func main() { - // Create a new Smart Contract - err := shim.Start(new(SmartContract)) + chaincode, err := contractapi.NewChaincode(new(SmartContract)) + if err != nil { - fmt.Printf("Error creating new Smart Contract: %s", err) + fmt.Printf("Error create fabcar chaincode: %s", err.Error()) + return + } + + if err := chaincode.Start(); err != nil { + fmt.Printf("Error starting fabcar chaincode: %s", err.Error()) } } diff --git a/chaincode/fabcar/go/go.mod b/chaincode/fabcar/go/go.mod index 1dd1a8a7a1..a8a2f78b91 100644 --- a/chaincode/fabcar/go/go.mod +++ b/chaincode/fabcar/go/go.mod @@ -1,13 +1,5 @@ module github.com/hyperledger/fabric-samples/chaincode/fabcar/go -go 1.12 +go 1.13 -require ( - github.com/hyperledger/fabric-chaincode-go v0.0.0-20190823162523-04390e015b85 - github.com/hyperledger/fabric-protos-go v0.0.0-20190821214336-621b908d5022 - golang.org/x/net v0.0.0-20190813141303-74dc4d7220e7 // indirect - golang.org/x/sys v0.0.0-20190813064441-fde4db37ae7a // indirect - golang.org/x/text v0.3.2 // indirect - google.golang.org/appengine v1.4.0 // indirect - google.golang.org/genproto v0.0.0-20190819201941-24fa4b261c55 // indirect -) +require github.com/hyperledger/fabric-contract-api-go v0.0.0-20191118113407-4c6ff12b4f96 diff --git a/chaincode/fabcar/go/go.sum b/chaincode/fabcar/go/go.sum index 66ba37b602..b9ee4c893d 100644 --- a/chaincode/fabcar/go/go.sum +++ b/chaincode/fabcar/go/go.sum @@ -1,85 +1,136 @@ cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= -github.com/BurntSushi/toml v0.3.1 h1:WXkYYl6Yr3qBf1K79EBnL4mak0OimBfB0XUf9Vl28OQ= github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU= +github.com/DATA-DOG/godog v0.7.13/go.mod h1:z2OZ6a3X0/YAKVqLfVzYBwFt3j6uSt3Xrqa7XTtcQE0= +github.com/PuerkitoBio/purell v1.1.1 h1:WEQqlqaGbrPkxLJWfBwQmfEAE1Z7ONdDLqrN38tNFfI= +github.com/PuerkitoBio/purell v1.1.1/go.mod 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