ocean.js/docs/quickstart_simple.md

Quickstart: Simple Flow

This section describes how to create a datatoken and host a dataset using the simplest flow.

Here are the the steps:

1. Initialize services
2. Create a new node.js project
3. Install dependancies
4. Create a config file and update contract addresses
5. Publish a new data token
6. Mint 100 tokens
7. Transfer tokens between users.
8. Host a dataset

Let's go through each of these in detail.

1. Initialize services

We start by initializing the services. To do this, we clone the Barge repository and run it. This will run the current default versions of Aquarius, Provider, and Ganache with our contracts deployed to it.

git clone https://github.com/oceanprotocol/barge.git
cd barge/
./start_ocean.sh --with-provider2 --no-dashboard

2. Create a new node.js project

Start by creating a new Node.js project. Open a new terminal and enter the following commands:

mkdir ocean-quickstart
cd ocean-quickstart
npm init
# Answer the questions in the command line prompt
cat > index.js
# On linux press CTRL + D to save

3. Install dependancies

Open the package.json file in a text editor and update the dependancies to include the following:

  "dependencies": {
    "@oceanprotocol/contracts": "^0.5.6",
    "@oceanprotocol/lib": "^0.6.5",
    "web3": "^1.3.0"
  }

Now in your terminal run the following command:

npm install

4. Create a config file and update contract addresses

Create a new config.js file:

cat > config.js

Now open the config.js in your code editor and enter the following:

const { ConfigHelper } = require("@oceanprotocol/lib");
const Web3 = require("web3");
const defaultConfig = new ConfigHelper().getConfig("development");

const urls = {
  networkUrl: "http://localhost:8545",
  aquarius: "http://localhost:5000",
  providerUri: "http://localhost:8030",
};

const contracts = {
  "DTFactory": "0x_YOUR_DTFactory_ADDRESS_",
  "BFactory": "0x_YOUR_DTFactory_ADDRESS_",
  "FixedRateExchange": "0x_YOUR_DTFactory_ADDRESS_",
  "Metadata": "0x_YOUR_Metadata_ADDRESS_",
  "Ocean": "0x_YOUR_Ocean_ADDRESS_"
};

const config = {
  ...defaultConfig,
  metadataCacheUri: urls.aquarius,
  providerUri: urls.providerUri,
  web3Provider: new Web3(urls.networkUrl),
};

module.exports = {
  config,
  contracts,
  urls,
};

Now check what your contract addresses are locally. In your terminal run:

cat ~/.ocean/ocean-contracts/artifacts/address.json

Next, update the contract addresses in your config.js file. Replace each of the place holders with the actual addresses that were outputted into your terminal.

5. Publish a new data token

Now open the index.js file in your text editor. Enter the following code and save the file:

const Web3 = require("web3");
const { Ocean, DataTokens } = require("@oceanprotocol/lib");

const { factoryABI } = require("@oceanprotocol/contracts/artifacts/DTFactory.json");
const { datatokensABI } = require("@oceanprotocol/contracts/artifacts/DataTokenTemplate.json");
const { config, contracts, urls } = require("./config");



const init = async () => {
  const ocean = await Ocean.getInstance(config);
  const blob = `http://localhost:8030/api/v1/services/consume`;

  const accounts = await ocean.accounts.list();
  const alice = accounts[0].id;
  console.log('Alice account address:', alice)

  const datatoken = new DataTokens(
    contracts.DTFactory,
    factoryABI,
    datatokensABI,
    new Web3(urls.networkUrl)
  );
  const tokenAddress = await datatoken.create(blob, alice);
  console.log(`Deployed datatoken address: ${tokenAddress}`);
};

init();

Now in your terminal, run the following command:

node index.js

Congratulations, you've created your first Ocean datatoken! 🌊🐋

6. Mint 100 tokens

Next, we will edit the code in index.js to mint 100 datatokens. These 100 data tokens are minted and sent to Alice's Address.

At the end of the init() { ... } function (after console.log('Deployed datatoken address: ${tokenAddress}')) add the following line of code:

  await datatoken.mint(tokenAddress, alice, '100', alice)
  let aliceBalance = await datatoken.balance(tokenAddress, alice)
  console.log('Alice token balance:', aliceBalance)

Now run the index.js file again:

node index.js

You should now see in the console output that Alice has a token balance of 100.

7. Transfer tokens between users.

Next we will transfer tokens from Alice to Bob. First we will edit the init() { ... } function to create an address for Bob. On the line after const alice = accounts[0].id add the following code:

  const bob = accounts[1].id;
  console.log('Bob account address:', bob);

Now at the end of the init() { ... } function (after console.log('Alice token balance:', aliceBalance)) add the following code:

  const transaction = await datatoken.transfer(tokenAddress, bob, '50', alice)
  const transactionId = transaction['transactionHash']
  console.log('transactionId', transactionId)

  const bobBalance = await datatoken.balance(tokenAddress, bob)
  aliceBalance = await datatoken.balance(tokenAddress, alice)

  console.log('Alice token balance:', aliceBalance)
  console.log('Bob token balance:', bobBalance)

Save the index.js file and run it again. In your terminal enter:

node index.js

You should now see in the terminal output that both Alice and Bob have a token balance of 50.

8. Publish a dataset

Create a new file called data.js. In your terminal enter these commands:

cat > data.js

Open the data.js file in your text editor. Enter the following code and save the file:

const testData = {
  main: {
    type: "dataset",
    name: "test-dataset",
    dateCreated: new Date(Date.now()).toISOString().split(".")[0] + "Z",
    author: "test",
    license: "MIT",
    files: [
      {
        url:
          "https://file-examples-com.github.io/uploads/2017/02/file_example_XLS_10.xls",
        contentType: "xlsx",
      },
    ],
  },
};

module.exports = { testData };

Now, in your index.js file import the test data. Add the following line of code at the top of the file under the other require() statements:

const { testData } = require("./data");

At the end of the init() { ... } function (after console.log('Bob token balance:', bobBalance)) add the following code:

  dataService = await ocean.assets.createAccessServiceAttributes(
    accounts[0],
    10, // set the price in datatoken
    new Date(Date.now()).toISOString().split(".")[0] + "Z", // publishedDate
    0 // timeout
  );

  // publish asset
  const createData = await ocean.assets.create(
    testData,
    accounts[0],
    [dataService],
    tokenAddress
  );

  const dataId = createData.id;
  console.log('Data ID:', dataId);

Now save and run the index.js file:

node index.js

In the terminal output you should now see the Data ID (did) outputed.

Congratulations, you have published your first dataset! 🌊🐠🐡 Now you are ready for the marketplace flow.