Configuration
For obtaining the API keys for blockchain access and setting the correct environment variables, please consult this section first and proceed with the next steps.
Create a directory
Let's start with creating a working directory where we store the environment variable file, configuration files, and the scripts.
mkdir my-ocean-project
cd my-ocean-project
Create a .env
file
.env
fileIn the working directory create a .env
file. The content of this file will store the values for the following variables:
OCEAN_NETWORK
Name of the network where the Ocean Protocol's smart contracts are deployed.
Yes
OCEAN_NETWORK_URL
The URL of the Ethereum node (along with API key for non-local networks)**
Yes
PRIVATE_KEY
The private key of the account which you want to use. A private key is made up of 64 hex characters. Make sure you have sufficient balance to pay for the transaction fees.
Yes
AQUARIUS_URL
The URL of the Aquarius. This value is needed when reading an asset from off-chain store.
No
PROVIDER_URL
The URL of the Provider. This value is needed when publishing a new asset or update an existing asset.
No
The below tabs show partially filled .env
file content for some of the supported networks.
# Mandatory environment variables
OCEAN_NETWORK=mainnet
OCEAN_NETWORK_URL=<replace this>
PRIVATE_KEY=<secret>
# Optional environment variables
AQUARIUS_URL=https://v4.aquarius.oceanprotocol.com/
PROVIDER_URL=https://v4.provider.oceanprotocol.com
Replace <replace this>
with the appropriate values. You can see all the networks configuration on Oceanjs' config helper.
Setup dependencies
In this step, all required dependencies will be installed.
Installation & Usage
Let's install Ocean.js library into your current project by running:
npm init
npm i @oceanprotocol/lib@latest dotenv crypto-js [email protected] @truffle/hdwallet-provider
Create a configuration file
A configuration file will read the content of the .env
file and initialize the required configuration objects which will be used in the further tutorials. The below scripts creates a Web3 wallet instance and an Ocean's configuration object.
Create the configuration file in the working directory i.e. at the same path where the .env
is located.
require("dotenv").config();
const {
Aquarius,
ConfigHelper,
configHelperNetworks,
} = require("@oceanprotocol/lib");
const ethers = require("ethers");
import fs from "fs";
import { homedir } from "os";
async function oceanConfig() {
const provider = new ethers.providers.JsonRpcProvider(
process.env.OCEAN_NETWORK_URL || configHelperNetworks[1].nodeUri
);
const publisherAccount = new ethers.Wallet(process.env.PRIVATE_KEY, provider);
let oceanConfig = new ConfigHelper().getConfig(
parseInt(String((await publisherAccount.provider.getNetwork()).chainId))
);
const aquarius = new Aquarius(oceanConfig?.metadataCacheUri);
// If using local development environment, read the addresses from local file.
// The local deployment address file can be generated using barge.
if (process.env.OCEAN_NETWORK === "development") {
const addresses = JSON.parse(
// eslint-disable-next-line security/detect-non-literal-fs-filename
fs.readFileSync(
process.env.ADDRESS_FILE ||
`${homedir}/.ocean/ocean-contracts/artifacts/address.json`,
"utf8"
)
).development;
oceanConfig = {
...oceanConfig,
oceanTokenAddress: addresses.Ocean,
fixedRateExchangeAddress: addresses.FixedPrice,
dispenserAddress: addresses.Dispenser,
nftFactoryAddress: addresses.ERC721Factory,
opfCommunityFeeCollector: addresses.OPFCommunityFeeCollector,
};
}
oceanConfig = {
...oceanConfig,
publisherAccount: publisherAccount,
consumerAccount: publisherAccount,
aquarius: aquarius,
};
return oceanConfig;
}
module.exports = {
oceanConfig,
};
Now you have set up the necessary files and configurations to interact with Ocean Protocol's smart contracts using ocean.js. You can proceed with further tutorials or development using these configurations.
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