Soroban Crowdfunding Dapp Example

This is a Next.js project, demoing how to build a dapp frontend backed by smart contracts on Stellar.

Getting Started

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Dependencies

1. soroban-cli v0.7.1. See https://soroban.stellar.org/docs/getting-started/setup#install-the-soroban-cli
2. docker (both Standalone and Futurenet backends require it).
3. Node.js v17
4. Freighter wallet v2.9.1. Download it from https://github.com/stellar/freighter/releases/tag/2.9.1 and Enable "Experimental Mode" in the settings (gear icon).
5. Build the soroban-preview docker image:

make build-docker

Building the docker image lets you avoid installing the specific version of soroban-cli in step (1), if desired.

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Backend (Local Standalone Network)

1. Run the backend docker containers and wait for them to start:

./quickstart.sh standalone

2. Load the contracts and initialize them:

You can use your own local soroban-cli:

./initialize.sh standalone

Or run it inside the soroban-preview docker container:

docker exec soroban-preview ./initialize.sh standalone

• Note: this state will be lost if the quickstart docker container is removed.

3. Add the Standalone custom network in Freighter

   Name	Standalone
   URL	http://localhost:8000/soroban/rpc
   Passphrase	Standalone Network ; February 2017
   Allow HTTP connection	Enabled
   Switch to this network	Enabled

4. Add some Standalone network lumens to your Freighter wallet. a. Copy the address for your freighter wallet. b. Visit http://localhost:8000/friendbot?addr=<your address>

Backend (Futurenet)

1. Run the backend docker container with ./quickstart.sh futurenet, and wait for it to start.

• Note: This can take up to 5 minutes to start syncing. You can tell it is working by visiting http://localhost:8000/, and look at the ingest_latest_ledger, field. If it is 0, the quickstart image is not ready yet.

2. Load the contracts and initialize it: You can use your own local soroban-cli:

./initialize.sh futurenet

Or run it inside the soroban-preview docker container:

docker exec soroban-preview ./initialize.sh futurenet

3. Add the Futurenet custom network in Freighter (Note, the out-of-the-box "Future Net" network in Freighter will not work with a local quickstart container, so we need to add our own):

   Name	Futurenet Local RPC
   URL	http://localhost:8000/soroban/rpc
   Passphrase	Test SDF Future Network ; October 2022
   Allow HTTP connection	Enabled
   Switch to this network	Enabled

4. Add some Futurenet network lumens to your Freighter wallet.

• Visit https://laboratory.stellar.org/#create-account, and follow the instructions to create your freighter account on Futurenet.

Frontend

Then, run the development server:

npm run dev

Open http://localhost:3000 with your browser to see the result.

Note: Before you can "Back this project", you'll need to have some EXT (example token) in your freighter wallet. There is a "Mint 100 EXT" button, which will gift you 100 EXT tokens for that purpose.

User Workflows

The contract dev should be able to:

• Clone the example repo (this one)
• Choose their target amount and deadline
• Deploy their contract to futurenet
• Deploy a soroban rpc server somewhere (TBD)
• Deploy the example web ui somewhere (e.g. netlify)

Then via the web UI, users should be able to:

• Connect their wallet (freighter for now)
• See their current balance(s)
• See the current fundraising status (total amount & time remaining)
• See allowed assets (xlm-only for now?)
• Deposit an allowed asset
• See their deposit(s) appear on the page as the transactions are confirmed.
• "Live"-Update the page with the total amount with the new amount

Wallet Integration & Data Fetching

There is a ./wallet directory, which contains a small library to connect to the user's freighter wallet, as well as some React hooks to talk to a soroban-rpc server (e.g. soroban-cli serve), to fetch data and send transactions.

Data from contracts is fetched using the useContractValue hook in ./wallet/hooks/useContractValue.tsx. Transactions are submitted to the network using the useSendTransactions hook in ./wallet/hooks/useSendTransaction.tsx.