cordapp-example-nodejs-server-graalvm

This example demonstates a nodejs server which uses corda rpc-3.1 library running in GraalVM. The nodejs server serves APIs to create IOU, fetch IOUs similar to the cordapp-example

Pre-requisites

• Cordapp-example network
• GraalVM environment

Setting Up the GraalVM environment

• Follow the official GraalVM documentation on how to setup the Graal for linux or osX.
• To learn more about GraalVM refer to the Mike Hearn's blog

Steps to the run the node.js server with GraalVM

• Edit the addjars.sh to specify the correct path where the jars are placed.
• Run ./addjars.sh command to export the JAR_CLASSPATH variable. This is required so that GraalVM can allow java classes to be loaded from node.js .
• Run the cordaapp-example nodes
• Make sure that the nodeConfig.json file matches the settings of a running node
• Run npm install from root directory of the project to install express and body-parser npm modules.
• Run node --jvm --jvm.cp=$JAR_CLASSPATH server.js
• Output will look like: PartyA Node.js server listening on port 3000

TroubleShooting

1. If you get the following error when starting the server, you need to install GraalVM:

   node: bad option: --jvm node: bad option: --jvm.cp=

2. If you get the following error, run source addjars.sh command to reflect the JAR_CLASSPATH varaible

   Error var CordaRPCClient = Java.type('net.corda.client.rpc.CordaRPCClient') Not found

Interacting with the Cordaapp-example network to create IOUs from nodejs server

1. Create-iou

curl -d '{"iouValue":10, "otherPartyOrgName":"PartyB","otherPartyOrgCountry":"New York", "otherPartyOrgLocality":"US"}' -H "Content-Type: application/json" -X POST http://localhost:3000/api/example/create-iou

2. Fetch IOUs

curl http://localhost:3000/api/example/ious

Other endpoints

• GET /api/example/me
• GET /api/example/peers