Step 7: Install and Run Chaincode - Amazon Managed Blockchain

Step 7: Install and Run Chaincode

In this section, you create and install a package for golang sample chaincode on your peer node. You also approve, commit, and verify the chaincode.

You then use the chaincode's init command to initialize values attributed to entities a and b in the ledger, followed by the query command to confirm that initialization was successful. Next, you use the chaincode's invoke command to transfer 10 units from a to b in the ledger. Finally, you use the chaincode's query command again to confirm that the value attributed to a was decremented by 10 units in the ledger.

Step 7.1: Install Vendor Dependencies

Run the following commands to enable vendoring for the Go module dependencies of your example chaincode.

sudo chown -R ec2-user:ec2-user fabric-samples/ cd fabric-samples/chaincode/abstore/go/ GO111MODULE=on go mod vendor cd -

Step 7.2: Create the Chaincode Package

Run the following command to create the example chaincode package.

docker exec cli peer lifecycle chaincode package ./abstore.tar.gz \ --path fabric-samples/chaincode/abstore/go/ \ --label abstore_1

Step 7.3: Install the Package

Run the following command to install the chaincode package on the peer node.

docker exec cli peer lifecycle chaincode install abstore.tar.gz

Step 7.4: Verify the Package

Run the following command to verify that the chaincode package is installed on the peer node.

docker exec cli peer lifecycle chaincode queryinstalled

The command returns the following if the package is installed successfully.

Installed chaincodes on peer: Package ID: MyPackageID, Label: abstore_1

Step 7.5: Approve the Chaincode

Run the following commands to approve the chaincode definition for your organization. Replace MyPackageID with the Package ID value returned in the previous step Step 7.4: Verify the Package.

export CC_PACKAGE_ID=MyPackageID docker exec cli peer lifecycle chaincode approveformyorg \ --orderer $ORDERER --tls --cafile /opt/home/managedblockchain-tls-chain.pem \ --channelID mychannel --name mycc --version v0 --sequence 1 --package-id $CC_PACKAGE_ID

Step 7.6: Check Commit Readiness

Run the following command to check whether the chaincode definition is ready to be committed on the channel.

docker exec cli peer lifecycle chaincode checkcommitreadiness \ --orderer $ORDERER --tls --cafile /opt/home/managedblockchain-tls-chain.pem \ --channelID mychannel --name mycc --version v0 --sequence 1

The command returns true if the chaincode is ready to be committed.

Chaincode definition for chaincode 'mycc', version 'v0', sequence '1' on channel 'mychannel' approval status by org: m-LVQMIJ75CNCUZATGHLDP24HUHM: true

Step 7.7: Commit the Chaincode

Run the following command to commit the chaincode definition on the channel.

docker exec cli peer lifecycle chaincode commit \ --orderer $ORDERER --tls --cafile /opt/home/managedblockchain-tls-chain.pem \ --channelID mychannel --name mycc --version v0 --sequence 1

Step 7.8: Verify the Chaincode

You might have to wait a minute or two for the commit to propagate to the peer node. Run the following command to verify that the chaincode is committed.

docker exec cli peer lifecycle chaincode querycommitted \ --channelID mychannel

The command returns the following if the chaincode is committed successfully.

Committed chaincode definitions on channel 'mychannel': Name: mycc, Version: v0, Sequence: 1, Endorsement Plugin: escc, Validation Plugin: vscc

Step 7.9: Initialize the Chaincode

Run the following command to initialize the chaincode.

docker exec cli peer chaincode invoke \ --tls --cafile /opt/home/managedblockchain-tls-chain.pem \ --channelID mychannel \ --name mycc -c '{"Args":["init", "a", "100", "b", "200"]}'

The command returns the following when the chaincode is initialized.

2021-12-20 19:23:05.434 UTC [chaincodeCmd] chaincodeInvokeOrQuery -> INFO 0ad Chaincode invoke successful. result: status:200

Step 7.10: Query the Chaincode

You might need to wait a brief moment for the initialization from the previous command to complete before you run the following command to query a value.

docker exec cli peer chaincode query \ --tls --cafile /opt/home/managedblockchain-tls-chain.pem \ --channelID mychannel \ --name mycc -c '{"Args":["query", "a"]}'

The command should return the value of a, which you initialized with a value of 100.

Step 7.11: Invoke the Chaincode

In the previous steps, you initialized the key a with a value of 100 and queried to verify. Using the invoke command in the following example, you subtract 10 from that initial value.

docker exec cli peer chaincode invoke \ --tls --cafile /opt/home/managedblockchain-tls-chain.pem \ --channelID mychannel \ --name mycc -c '{"Args":["invoke", "a", "b", "10"]}'

The command returns the following when the chaincode is invoked.

2021-12-20 19:23:22.977 UTC [chaincodeCmd] chaincodeInvokeOrQuery -> INFO 0ad Chaincode invoke successful. result: status:200

Lastly, you again query the value of a using the following command.

docker exec cli peer chaincode query \ --tls --cafile /opt/home/managedblockchain-tls-chain.pem \ --channelID mychannel \ --name mycc -c '{"Args":["query", "a"]}'

The command should return the new value 90.