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logbook-app

Logbook App (Chaincode)

The chaincode is made with hyperledger fabric. It is used to store the data of the logbook entries. It is written in typescript in Node.js and compiled to javascript.

Prerequisites

Using your own network

If you decide to host your own chaincode, you need to have a running instance of hyperledger fabric. You can find more information on how to do this in the hyperledger fabric documentation.

Discord Logger

The REST API can send logs to a Discord channel. To do this, you need to create a Discord Webhook and change the Discord webhook url url in the DiscordHook file.

Run and Build the Chaincode

Docker

Locate into the chaincode directory:

cd chaincode

Build the docker image:

docker build -t scrayorg/logbook-app-chaincode:1.0 .

Run the docker image:

docker run scrayorg/logbook-app-chaincode:1.0

You will have to open some ports to be able to communicate with the chaincode.

Run it in local mikrok8s cluster

Move image

docker save scrayorg/logbook-app-chaincode:1.0 > logbook-app-chaincode:1.0.tar
microk8s ctr image import logbook-app-chaincode:1.0.tar

Start deployment and install chaincode

PKGID=basic_1.0:a50b6e6de3ac0a753193c6f36767ca26f2a09670542ed6a5ded0b1ac3efef923
kubectl delete configmap invoice-chaincode-external
kubectl create configmap invoice-chaincode-external \
 --from-literal=chaincode_id=$PKGID



kubectl apply -f k8s-deployment-descriptor.yaml

Debugging

Editing chaincode in container

  • Get pod with contains the chaincode: 
    CC_POD=$(kubectl get pod -l app=logbook-app-chaincode -o jsonpath="{.items[0].metadata.name}")
  • Get console promt in chain code container 
    kubectl exec --stdin --tty $CC_POD  -- /bin/sh
  • Edit chain code 
     cd /usr/local/lib/logbook-app/chaincode
 vi release/blockchain/contract.js
  • Compiel and start chain code 
    npm install
npm start

Manualy start chaincode

Start in background

nohup npm start > /var/log/chaincode/logbook-app.logs 2>&1 &

Terminate chaincode

kill $(ps -ef | pgrep -f fabric-chaincode-node)

Show logs

tail -f /var/log/chaincode/logbook-app.logs

Execute chaincode with CLI

peer chaincode query -C channel-1 -n basic -c '{"function":"getTours","Args":[""]}'