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Tic-Tac-Toe on Solana

This project demonstrates how to use the Solana Javascript API to build, deploy, and interact with programs on the Solana blockchain, implementing an interactive tic-tac-toe game between two users. To see the final product, go to https://solana-example-tictactoe.herokuapp.com/ and wait for another player to join. (Direct a second browser window to the web app to play against yourself.)

The project comprises:

  • The on-chain Tic-Tac-Toe program, a BPF program written in Rust program-bpf-rust and C program-bpf-c
  • Easy program build and deployment using the @solana/web3.js library
  • Command-line and web front-end: src/

Learn about Solana

More information about how Solana works is available in the Book

Getting Started

The following dependencies are required to build and run this example, depending on your OS they may already be installed:

$ npm --version
$ docker -v
$ wget --version
$ rustc --version

Next fetch the npm dependencies, including @solana/web3.js, by running:

$ npm install

Select a Network

The example connects to a local Solana cluster by default.

To enable on-chain program logs, set the RUST_LOG environment variable:

$ export RUST_LOG=solana_runtime::native_loader=trace,solana_runtime::system_instruction_processor=trace,solana_runtime::bank=debug,solana_bpf_loader=debug,solana_rbpf=debug

To start a local Solana cluster run:

$ npm run localnet:update
$ npm run localnet:up

Solana cluster logs are available with:

$ npm run localnet:logs

To stop the local solana cluster run:

$ npm run localnet:down

For more details on working with a local cluster, see the full instructions.

Build the BPF program

$ npm run build:bpf-rust

or

$ npm run build:bpf-c

The compiler places output files in dist/program. Program build scripts contain the compiler settings and can be found in the Solana SDK

Run the Command-Line Front End

After building the program,

$ npm run start

This script uses the Solana Javascript API BpfLoader to deploy the Tic-Tac-Toe program to the blockchain. Once the deploy transaction is confirmed on the chain, the script calls the program to instantiate a new dashboard to track the open and completed games (findDashboard), and starts a new game (dashboard.startGame), waiting for an opponent.

To play the game, open a second terminal and again run the npm run start script.

To see the program or game state on the blockchain, send a getAccountInfo JSON-RPC request to the cluster, using the id printed by the script, eg.:

  • Dashboard programId: HFA4x4oZKWeGcRVbUYaCHM59i5AFfP3nCfc4NkrBvVtP
  • Dashboard: HmAEDrGpsRK2PkR51E9mQrKQG7Qa3iyv4SvZND9uEkdR
  • Advertising our game (Gx1kjBieYgaPgDhaovzvvZapUTg5Mz6nhXTLWSQJpNMv)

Run the WebApp Front End

After building the program,

$ npm run dev

This script deploys the program to the blockchain and also boots up a local webserver for gameplay.

To instantiate a dashboard and game, open your browser to http://localhost:8080/.

Customizing the Program

To customize Tic-Tac-Toe, make changes to the program in program-bpf-rust/src, rebuild it, and restart the network. Now when you run npm run start, you should see your changes.

To deploy a program with a different name, edit src/server/config.js.

Pointing to a public Solana cluster

Solana maintains three public clusters:

  • devnet - Development cluster with airdrops enabled
  • testnet - Tour De Sol test cluster without airdrops enabled
  • mainnet-beta - Main cluster

Use npm scripts to configure which cluster.

To point to devnet:

$ npm run cluster:devnet

To point back to the local cluster:

$ npm run cluster:localnet