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Create Contract

Create and Compile Your First Contract

There are a couple ways to get you started.

{% tabs %} {% tab title="Swanky Phala" %}

If you have not installed swanky phala CLI tool, follow these steps to get started.

Go to your development workspace and initialize a new project. For this tutorial, we will name the project Norwhich and choose the phat_hello template.

swanky phala init Norwhich

Here is a video example of the creating the new project called Norwhich.

{% embed url="https://youtu.be/gAPV01e9Ljs" %} swanky phala init {% endembed %}

Next, cd into the Norwhich directory and compile the phat_hello Phat Contract that was generated with the following command:

swanky phala contract compile -c phat_hello

Here is a short clip of compiling the phat_hello contract.

{% embed url="https://youtu.be/pHQOk69OOYA" %} swanky phala contract compile {% endembed %} {% endtab %}

{% tab title="GitHub" %} In order to initialize a new Phat Contract project you can use our hello world template:

git clone https://github.com/Phala-Network/phat-hello

Contract Examples

More Phat contract examples can be found in phat-contract-examples and awesome-phat-contracts repositories.

This will create a folder phat-hello in your work directory. The folder contains a scaffold Cargo.toml and a lib.rs, which both contain the necessary building blocks for using Phat Contract.

The lib.rs contains our hello world contract ‒ an ETH balance reader.

In order to build the contract just execute this command in the phat-hello folder:

cargo contract build

{% endtab %} {% endtabs %}

As a result, you’ll get the following files in the target/ink folder of your contract: phat_hello.wasm, metadata.json, and phat_hello.contract. The .contract file combines the WASM and metadata into one file and needs to be used when instantiating the contract.

Run Unit Tests Locally

Before you really upload and deploy your contract to the blockchain, you are encouraged to run local unit tests to check its correctness.

In the phat-hello folder, run

cargo test -- --nocapture

and ensure you see all tests passed.

Do not use cargo contract test here, cargo test will give you more details if something goes wrong.

-- --nocapture is optional to see the output during testing.

Now you have successfully compiled and locally test your first Phat Contract. Now it’s time to deploy it to a real blockchain.