chaincode

Prerequisites

• Make sure you have docker and docker-compose tools installed on your system.
• Make sure your system has make installed.
  For Windows system, install make from: http://gnuwin32.sourceforge.net/packages/make.htm

Build Chaincode

From root directory of project, run make chaincode

Unit Test Chaincode

From root directory of project, run make chaincode_test

Run Chaincode in Net Mode

In this mode, your chaincode will be installed and invoked as part of a larger distributed application.

Prerequisites

• Make sure that access control is enabled within the chaincode by setting the value of TradeWorkflowChaincode.testMode to false.
  • In both trade_workflow/tradeWorkflow.go and trade_workflow_v1/tradeWorkflow.go, this is set in the main function as follows:

    func main() {
    	twc := new(TradeWorkflowChaincode)
    	twc.testMode = false
    	err := shim.Start(twc)
    	if err != nil {
    		fmt.Printf("Error starting Trade Workflow chaincode: %s", err)
    	}
    }
    

Launch the Network and Application

• Follow instructions in network, middleware, and application in sequence.

Run Chaincode in Dev Mode

In this mode, you will manually install and invoke the chaincode using CLI (Command-Line Interface) commands.

Prerequisites

• Make sure that access control is disabled within the chaincode by setting the value of TradeWorkflowChaincode.testMode to true.
  • In both trade_workflow/tradeWorkflow.go and trade_workflow_v1/tradeWorkflow.go, this is set in the main function as follows:

    func main() {
    	twc := new(TradeWorkflowChaincode)
    	twc.testMode = true
    	err := shim.Start(twc)
    	if err != nil {
    		fmt.Printf("Error starting Trade Workflow chaincode: %s", err)
    	}
    }
    

Start the Blockchain Network

• Navigate to the network folder and run ./trade.sh up -d true.
• This will first create cryptographic material for the network participants and channel artifacts
• It will then start a network of 4 docker containers:
  • An orderer
  • A peer running in dev-mode.
  • A container to build and launch the chaincode
  • A container to run CLI commands
    • To create a blockchain channel named tradechannel
    • To install, instantiate, and invoke the chaincode on this channel

Build and Run Chaincode

• Compile the chaincode by running the following commands in sequence:
  • docker exec -it chaincode bash (Log into the chaincode container)
  • cd trade_workflow_v1
  • go build (Compile chaincode to generate an executable)
• Launch the chaincode by running the following command in the container:
  • CORE_PEER_ADDRESS=peer:7052 CORE_CHAINCODE_ID_NAME=tw:0 ./trade_workflow_v1

Install and Instantiate Chaincode

• Connect to the CLI container and install the chaincode with the name tw and version 0:
  • docker exec -it cli bash (Log into the CLI container)
  • peer chaincode install -p chaincodedev/chaincode/trade_workflow_v1 -n tw -v 0
• Instantiate this chaincode
  • peer chaincode instantiate -n tw -v 0 -c '{"Args":["init","LumberInc","LumberBank","100000","WoodenToys","ToyBank","200000","UniversalFreight","ForestryDepartment"]}' -C tradechannel

Invoke Chaincode

• Make sure you are still logged into the CLI container (or log back in if you exited it)
• To test the chaincode, try to record a trade agreement request with ID trade-12 on the ledger:
  • peer chaincode invoke -n tw -c '{"Args":["requestTrade", "trade-12", "50000", "Wood for Toys"]}' -C tradechannel
  • Watch the console logs for information and errors (if any)
• If the above invocation succeeded, query the chaincode for the status of the trade agreement request:
  • peer chaincode invoke -n tw -c '{"Args":["getTradeStatus", "trade-12"]}' -C tradechannel
  • The chaincode should return the status REQUESTED, which you should see in the console logs.
• You can run other chaincode invocations and queries as per the API.