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a guest Jan 18th, 2019 65 Never
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  1. package main
  2.  
  3. import (
  4.    "github.com/hyperledger/fabric/core/chaincode/shim"
  5.    sc "github.com/hyperledger/fabric/protos/peer"
  6. )
  7.  
  8. type SmartContract struct {
  9.     // Here we can store specific smartcontract data
  10. }
  11.  
  12. type Asset struct {
  13.     Name string `json:"name"`
  14. }
  15.  
  16. /*
  17.  * The Invoke method is called as a result of an application request to run the Smart Contract
  18.  * The calling application program has also specified the particular smart contract function to be called, with arguments
  19.  */
  20. func (s *SmartContract) Invoke(APIstub shim.ChaincodeStubInterface) sc.Response {
  21.     function, args := APIstub.GetFunctionAndParameters()
  22.     switch function {
  23.     case "getAsset":
  24.         return s.getAsset(APIstub, args)
  25.     }
  26.  
  27.     return shim.Error("Invalid Smart Contract function name.")
  28. }
  29.  
  30. func (s *SmartContract) getAsset(
  31.  APIstub shim.ChaincodeStubInterface, args []string) sc.Response {
  32.  
  33.     if len(args) != 1 {
  34.         return shim.Error("Incorrect number of arguments. Expecting 1")
  35.     }
  36.  
  37.     assetAsBytes, err := APIstub.GetState(args[0])
  38.  
  39.     if err != nil || len(assetAsBytes) == 0 {
  40.         return shim.Error(fmt.Sprintf("No asset with ID: %s", args[0]))
  41.     }
  42.  
  43.     return shim.Success(s.getObjectAsBytes(assetLocalID, assetAsBytes))
  44. }
  45.  
  46. func (s *SmartContract) getObjectAsBytes(
  47.     identificator string, objectAsBytes []byte) []byte {
  48.    
  49.     var buffer bytes.Buffer
  50.     buffer.WriteString("{\"Key\":")
  51.     buffer.WriteString("\"")
  52.     buffer.WriteString(identificator)
  53.     buffer.WriteString("\"")
  54.     buffer.WriteString(", \"Record\":")
  55.     buffer.WriteString(string(objectAsBytes))
  56.     buffer.WriteString("}")
  57.    
  58.     return buffer.Bytes()
  59. }
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