Blockchain as a Service:Node.js SDK usage example

1.1 Download the package

Download node-sdk-demo-1.4.5 and extract it to any directory. Copy your connection-profile-standard.json (downloaded from the BaaS console) into the node-sdk-demo/config directory.

The final directory structure looks like this:

1.2 Configure the connection profile

The connection profile tells the Node.js SDK how to connect to your Fabric network. You need to add your organization's CA credentials to the certificateAuthorities section so the SDK can enroll users and obtain certificates.

Open config/connection-profile-standard.json and add a registrar entry under the CA that belongs to your organization:

"registrar": [
    {
        "enrollId": "user",
        "enrollSecret": "user-secret"
    }
]

For example, if the username is user and the password is user-secret, and the user belongs to the test10 organization, add the credentials to the CA entry ca1.test10.aliyunbaas.top.

The modified certificateAuthorities section looks like this:

Tip: Paste the JSON into jsonlint.com to format and validate it before saving.

3.1 Install dependencies and start the app

From the node-sdk-demo directory, install the npm dependencies and start the app:

npm install --registry http://registry.npmmirror.com
gulp marbles_baas

When the app starts successfully, you see the following output:

Debug: Open your browser to http://localhost:3001 and login to tweak settings for startup

Open http://localhost:3001 in your browser. If prompted for a password, enter admin.

3.2 Configure the chaincode settings

The app opens on a setup guide page. Select Guided mode. It automatically jumps to step 3, where you configure the chaincode connection:

Fill in the following fields:

Click Try Again. If the chaincode is detected successfully, you see the following page:

If the check fails, confirm that the chaincode has been uploaded and instantiated on the correct channel.

3.3 Play the game

Close the dialog box to start the marble-trading game. Drag marbles from one user to another to transfer assets. Click + next to a user to add a marble, or drag a marble to the trash to delete it.