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Add function to private data hash to sample private data chaincode

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Signed-off-by: NIKHIL E GUPTA <negupta@us.ibm.com>
This commit is contained in:
NIKHIL E GUPTA 2020-03-24 08:21:10 -04:00 committed by denyeart
parent 23df2d620a
commit 6c876534bc
1 changed files with 33 additions and 1 deletions
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34
chaincode/marbles02_private/go/marbles_chaincode_private.go
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@ -27,7 +27,10 @@ SPDX-License-Identifier: Apache-2.0
// peer chaincode query -C mychannel -n marblesp -c '{"Args":["readMarble","marble1"]}'
// peer chaincode query -C mychannel -n marblesp -c '{"Args":["readMarblePrivateDetails","marble1"]}'
// peer chaincode query -C mychannel -n marblesp -c '{"Args":["getMarblesByRange","marble1","marble4"]}'
//
// Query a marble's public data hash
// peer chaincode query -C mychannel -n marblesp -c '{"Args":["getMarbleHash","collectionMarbles","marble1"]}'
// Rich Query (Only supported if CouchDB is used as state database):
// peer chaincode query -C mychannel -n marblesp -c '{"Args":["queryMarblesByOwner","tom"]}'
// peer chaincode query -C mychannel -n marblesp -c '{"Args":["queryMarbles","{\"selector\":{\"owner\":\"tom\"}}"]}'
@ -166,6 +169,9 @@ func (t *SimpleChaincode) Invoke(stub shim.ChaincodeStubInterface) pb.Response {
case "getMarblesByRange":
//get marbles based on range query
return t.getMarblesByRange(stub, args)
case "getMarbleHash":
//verify a marble using the public hash
return t.getMarbleHash(stub, args)
default:
//error
fmt.Println("invoke did not find func: " + function)
@ -649,3 +655,29 @@ func getQueryResultForQueryString(stub shim.ChaincodeStubInterface, queryString
return buffer.Bytes(), nil
}
// ===============================================
// getMarbleHash - use the public data hash to verify a private marble
// Result is the hash on the public ledger of a marble stored a private data collection
// ===============================================
func (t *SimpleChaincode) getMarbleHash(stub shim.ChaincodeStubInterface, args []string) pb.Response {
var name, collection string
var err error
if len(args) != 2 {
return shim.Error("Incorrect number of arguments. Expecting the collection and the name of the marble to query")
}
collection = args[0]
name = args[1]
// GetPrivateDataHash can use any collection deployed with the chaincode as input
hashAsbytes, err := stub.GetPrivateDataHash(collection, name)
if err != nil {
return shim.Error("Failed to get public data hash for marble:" + err.Error())
} else if hashAsbytes == nil {
return shim.Error("Marble does not exist: " + name)
}
return shim.Success(hashAsbytes)
}