Hyperledger fabric: Unable to query result

0 votes

I have invoked my chaincode with this command

> peer chaincode invoke -o orderer.example.com:7050  --tls
> /opt/gopath/src/github.com/hyperledger/fabric/peer/crypto/ordererOrganizations/example.com/orderers/orderer.example.com/msp/tlscacerts/tlsca.example.com-cert.pem
> -C ethos -n ethos_ccv100 -c '{"Args":["CreatePatientInfo","123456", "22", "175","74","133","37","Eggs","Fever", "Wei Quan", "Tsu",
> "11April1995","tsuweiquan@gmail.com","96259561", "SINGAPOREAN",
> "Chinese", "Buddist", "Single","13Aug2017"]}'

Now, when I run either of this command:

peer chaincode query -C ethos -n ethos_ccv100 -c '{"Args["queryPatientInfo","123456"]}'


peer chaincode query -C ethos -n ethos_ccv100 -c '{"function":"queryPatientInfo","Args":["123456"]}'

I am getting this output which is different from what I expected:

2018-30-10 12:48:32.066 UTC [msp] GetLocalMSP -> DEBU 001 Returning existing local MSP 2018-30-10
12:48:32.066 UTC [msp] GetDefaultSigningIdentity -> DEBU 002 Obtaining default signing identity 2018-30-10 
12:48:32.066 UTC [chaincodeCmd] checkChaincodeCmdParams -> INFO 003 Using default escc 2018-30-10
12:48:32.067 UTC [chaincodeCmd] checkChaincodeCmdParams -> INFO 004 Using default vscc 2018-30-10
12:48:32.067 UTC [msp/identity] Sign -> DEBU 005 Sign: plaintext:
0A98070A6A08031A0B08A095C1CC0510...74496E666F0A09533935313139323447 2018-30-10 12:48:32.067 UTC
[msp/identity] Sign -> DEBU 006 Sign: digest:
4920E5394B2048EC5629886A51A0F022BED4803495C9FC08B5AB62A1463B92BD Query Result (Raw): 2018-30-10 12:48:32.073 UTC [main] main -> INFO 007 Exiting.....
Oct 30, 2018 in Blockchain by digger
• 26,670 points

1 answer to this question.

0 votes

In Hyperledger Fabric v1.0.0 your chaincode should confirm following API:

// Chaincode interface must be implemented by all chaincodes. The fabric runs
// the transactions by calling these functions as specified.
type Chaincode interface {
    // Init is called during Instantiate transaction after the chaincode container
    // has been established for the first time, allowing the chaincode to
    // initialize its internal data
    Init(stub ChaincodeStubInterface) pb.Response

    // Invoke is called to update or query the ledger in a proposal transaction.
    // Updated state variables are not committed to the ledger until the
    // transaction is committed.
    Invoke(stub ChaincodeStubInterface) pb.Response

And also, 

Query(stub shim.ChaincodeStubInterface) pb.Response

is not a part of it, therefore you need to explicitly add dispatch to this function inside the Invoke, e.g.:

func (t *SampleChaincode) Invoke(stub shim.ChaincodeStubInterface) pb.Response {
    function, args := stub.GetFunctionAndParameters()
    if function == "CreatePatientInfo" {
        return CreatePatientInfo(stub, args)
    } else if function == "queryPatientInfo" {
        return t.Query(stub)
    return shim.Success(nil)

Hope this helps

answered Oct 30, 2018 by Omkar
• 69,030 points

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