SPL token faucet

This project aims at implementing an SPL token faucet in its simplest form using Anchor. Faucets are a must-have when developing dApps to test out token flows. A faucet allows you to receive an arbitrary amount of tokens; always coming from the same Mint. At Credix, we use this faucet to "mimic" USDC on testnet and devnet (as the USDC faucet is only available on testnet AND only allows 5USDC per IP, which is very limiting). The program is deployed on both testnet and devnet at 4sN8PnN2ki2W4TFXAfzR645FWs8nimmsYeNtxM8RBK6A and the Mints PK is Gh9ZwEmdLJ8DscKNTkTqPbNwLNNBjuSzaG9Vp2KGtKJr on both networks.

A reference UI has been implemented to make it easy for your end-users to get DUMMY tokens and use those in your application. The code for this reference UI can be found in the App folder. The hosted version can be found here.

Using the query parameter token-name, you can customize the UI to your needs. E.g. if we send the faucet to our test-users, we use the url https://spl-token-faucet.com?token-name=USDC to make the app look as it's a USDC faucet. If I want to mock the issuance of a TST token, I could send the url https://spl-token-faucet.com?token-name=TST.

Program

Running the program on Localnet

Swith to localnet.

solana config set --url http://127.0.0.1:8899

Run

rm -rf test-ledger && solana-test-validator

This will spin up a local validator that our client interacts with. More info on setting up a local validator can be found here.

Anchor program building and deployment

Follow this tutorial for an in depth-explanation on how to build your anchor program and deploy it to the different clusters.

Copy the keypair into the build folder to override the generated keypair by Anchor. Normally, we never upload keypairs to GitHub, however we did upload this one so you can deploy the program locally using the same program id. You cannot upgrade the deployed versions (devnet, testnet) as their upgrade authority is already set.

cp spl_token_faucet-keypair.json ./target/deploy/spl_token_faucet-keypair.json

In order to build the program use following command.

anchor build

Now you can deploy it.

anchor deploy

You can now go to the spl-token-faucet and airdrop yourself some SOL and DUMMY tokens.

If you want to do an airdrop of 10000 DUMMY tokens without running the client to the current provider, run following script.

ANCHOR_WALLET=~/.config/solana/id.json ANCHOR_PROVIDER_URL=http://127.0.0.1:8899 node setup/usdc_airdrop.js

Running program tests

Before it's possible to run tests, all packages need to be installed and mocha-ts and typescript need to be globally installed.

npm install -g ts-mocha typescript

npm install

Run all tests by using following command.

anchor test

Client

Running the client locally

Go to the app directory and run following command.

npm start

Running client tests

Before it's possible to run tests, all packages need to be installed. Make sure you are in the app directory.

npm install

Now it's possible to run UI tests.

npm test