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#How to use hfc with the IBM Bluemix Blockchain beta service

The goal is to run helloblockchain.js sample program, which will deploy example02 chaincode and query/invoke it.

  1. Install npm, instructions are here

  2. Create a directory (Workspace) folder where you will place the helloblockchain.js source code and node modules. For example, mkdir -p $HOME/Workspace

  3. Go to Workspace folder and Install hfc v0.5.0 with the below command:

    cd $HOME/Workspace
npm install [email protected]

  4. Download helloblockchain.js and save it your Workspace folder.
    It looks something like below:

    alt tag

  5. Create a Bluemix account, login and using the Catlog and select the Blockchain service. Once in the service select either a Starter Developer plan or High Security Business Network plan (if authorized). Now, click on CREATE and get the Service Credentials for the service. Cut and Paste this json file and save it as ServiceCredentials.json in your local directory where helloblockchain.js

    • Refer the sample file in repo here

    alt tag

  6. Please ensure you have a /tmp directory and the program can access this directory. Now, open the source code helloblockchain.js and search for: setKeyValStore. The helloblockchain.js program sets this to /tmp/KeyValStore. The node sdk will create the keyValStore directory and store cryptography data for each user that registers. Note: The contents in the KeyValStore directory should be deleted when connecting to a different fabric.
    To reiterate what has just been stated:

    1. Find your key value store locally and make sure the path to the folder exists
      • (in windows default is) C:\tmp\keyValStore
    2. Also delete anything in this keyValStore folder (you should empty this out anytime you connect to a new network or switch users)

  7. Create chaincode folder under your $GOPATH.

    • cd $GOPATH/src/github.com/
    • mkdir chaincode_example02
    • copy chaincode_example02.go to this folder, chaincode_example02.go can be obtained from this repo

  8. Download vendor.zip and copy the same to chaincode_example02 folder and unzip

    • delete vendor.zip

  9. From Workspace folder run node program:

    node helloblockchain.js -c $GOPATH/src/github.com/chaincode_example02

    To enable debug logs :

    DEBUG=hfc node helloblockchain.js -c $GOPATH/src/github.com/chaincode_example02

    To enable grpc traces:

    GRPC_TRACE=all DEBUG=hfc node helloblockchain.js -c $GOPATH/src/github.com/chaincode_example02

Once Deploy/Invoke and Query are successful, we should see the below messages:

Successfully deployed chaincode: request={"fcn":"init","args":["a","100","b","200"],"certificatePath":"/certs/blockchain-cert.pem","chaincodePath":"github.com/chaincode_example02/"}, response={"uuid":"2d6ad8d6-1390-4c60-a01b-f4c301175eb7","chaincodeID":"9be0a0ed3f1788e8728c8911c747d2f6d0e205fa63422dc598d498fe709b9b8d","result":"TODO: get actual results; waited 120 seconds and assumed deploy was successful"}

Successfully submitted chaincode invoke transaction: request={"chaincodeID":"9be0a0ed3f1788e8728c8911c747d2f6d0e205fa63422dc598d498fe709b9b8d","fcn":"invoke","args":["a","b","1"]}, response={"uuid":"f9a902d2-44d8-4b68-b43d-419470ba73ae"}

Successfully completed chaincode invoke transaction: request={"chaincodeID":"9be0a0ed3f1788e8728c8911c747d2f6d0e205fa63422dc598d498fe709b9b8d","fcn":"invoke","args":["a","b","1"]}, response={"result":"waited 20 seconds and assumed invoke was successful"}

Successfully queried  chaincode function: request={"chaincodeID":"9be0a0ed3f1788e8728c8911c747d2f6d0e205fa63422dc598d498fe709b9b8d","fcn":"query","args":["a"]}, value=99

#Troubleshoot

  • Make sure you have [email protected] with either of the below commands from your workspace dir

    • npm list | grep hfc
    • npm list -g | grep hfc # If installed using -g flag

  • if you get query failure error as below.

Failed to query chaincode, function: request={"chaincodeID":"9be0a0ed3f1788e8728c8911c747d2f6d0e205fa63422dc598d498fe709b9b8d","fcn":"query","args":["a"]}, error={"error":{"status":"FAILURE","msg":{"type":"Buffer","data":[69,114,114,111,114,58,70,97,105,108,101,100,32,116,111,32,108,97,117,110,99,104,32,99,104,97,105,110,99,111,100,101,32,115,112,101,99,40,112,114,101,109,97,116,117,114,101,32,101,120,101,99,117,116,105,111,110,32,45,32,99,104,97,105,110,99,111,100,101,32,40,57,98,101,48,97,48,101,100,51,102,49,55,56,56,101,56,55,50,56,99,56,57,49,49,99,55,52,55,100,50,102,54,100,48,101,50,48,53,102,97,54,51,52,50,50,100,99,53,57,56,100,52,57,56,102,101,55,48,57,98,57,98,56,100,41,32,105,115,32,98,101,105,110,103,32,108,97,117,110,99,104,101,100,41]}},"msg":"Error:Failed to launch chaincode spec(premature execution - chaincode (9be0a0ed3f1788e8728c8911c747d2f6d0e205fa63422dc598d498fe709b9b8d) is being launched)"}


increase deploy wait time
ex: `chain.setDeployWaitTime(80);`

- if you get a handshake error, try a different `grpc` version
* You can get the version details by issuing either of the below commands
  - `npm list | grep grpc`
  - `npm list -g | grep grpc`