@phala/fn

@phala/fn

Phat Function CLI toolkit

Requirements

Node.js >= 18

Install

Depending on how you manage your projects you can:

1. Add @phala/fn to your project dependencies (yarn / npm):

yarn add -D @phala/fn

yarn phat-fn --help

1. Install it globally and use npx to call it:

npm install -g @phala/fn

npx @phala/fn --help

Commands

Global flags

--help                      # Prints the help for the command

Commands index

• phat-fn init
• phat-fn build
• phat-fn run
• phat-fn upload
• phat-fn update
• phat-fn watch

phat-fn init

Create a new project from template

USAGE
  $ phat-fn init NAME [-t <value>] [-d <value>] [-r]

FLAGS
  -d, --dir=<value>       The target location for the project. If omitted, a new folder NAME is created.
  -r, --remove            Clean up the target directory if it exists
  -t, --template=<value>  Choose one of the templates:
                          - phat-contract-starter-kit The Phat Contract Starter Kit
                          - lensapi-oracle-consumer-contract Polygon Consumer Contract for LensAPI Oracle

phat-fn build

Build a production bundle of the function script

USAGE
  $ phat-fn build [SCRIPT] [-d <value>] [-o <value>] [-w <value>] [--mode production|prod|development|dev]

ARGUMENTS
  SCRIPT  [default: src/index] The function script file

FLAGS
  -d, --location=<value>  Location directory
  -o, --output=<value>    Output directory
  -w, --webpack=<value>   Custom webpack config
  --mode=<option>         [default: production]
                          <options: production|prod|development|dev>

phat-fn run

Run the script in PhatJS runtime

USAGE
  $ phat-fn run SCRIPT [--json] [-a <value>]

ARGUMENTS
  SCRIPT  The location of the JS file

FLAGS
  -a, --scriptArgs=<value>...  Script arguments

GLOBAL FLAGS
  --json  Format output as json.

phat-fn upload

Upload JS to Phat Contract

USAGE
  $ phat-fn upload [SCRIPT] [-e <value>] [-a <value> | --suri <value>] [-p <value> | ] [--endpoint <value>] [--rpc <value>]
    [--brickProfileFactory <value>] [--consumerAddress <value>] [--coreSettings <value>] [--mode production|prod|development|dev] [-b]

ARGUMENTS
  SCRIPT  [default: src/index] The function script file

FLAGS
  -a, --accountFilePath=<value>  Path to polkadot account JSON file
  -b, --build
  -e, --envFilePath=<value>      Path to env file
  -p, --accountPassword=<value>  Polkadot account password
  --brickProfileFactory=<value>  Brick profile factory contract address
  --consumerAddress=<value>      Consumer contract address
  --coreSettings=<value>         Core settings
  --endpoint=<value>             Phala Blockchain RPC endpoint
  --mode=<option>                [default: development]
                                 <options: production|prod|development|dev>
  --rpc=<value>                  Client RPC URL
  --suri=<value>                 Substrate uri

phat-fn update

USAGE
  $ phat-fn update [SCRIPT] [-e <value>] [-a <value> | --suri <value>] [-p <value> | ] [--endpoint <value>] [--brickProfileFactory <value>]
    [--workflowId <value>] [--mode production|prod|development|dev] [-b]

ARGUMENTS
  SCRIPT  [default: src/index] The function script file

FLAGS
  -a, --accountFilePath=<value>  Path to account account JSON file
  -b, --build
  -e, --envFilePath=<value>      Path to env file
  -p, --accountPassword=<value>  Polkadot account password
  --brickProfileFactory=<value>  Brick profile factory contract address
  --endpoint=<value>             Phala Blockchain RPC endpoint
  --mode=<option>                [default: development]
                                 <options: production|prod|development|dev>
  --suri=<value>                 Substrate uri
  --workflowId=<value>           Workflow ID

phat-fn watch

Watch contract events and run Phat Function

USAGE
  $ @phala/fn watch ADDRESS CONTRACT JS [--rpc <value>] [-a <value>] [--once]

ARGUMENTS
  ADDRESS   The contract address
  CONTRACT  The location of the contract JSON file
  JS        The location of the JS file

FLAGS
  -a, --scriptArgs=<value>...  [default: ] Script arguments
  --once                       Process events once only
  --rpc=<value>                RPC endpoint

Getting Started

Quick Start

Create a new project With NPX:

npx @phala/fn init my-phat-function

Then follow the prompts.

You can also directly specify the template you want to use via additional command line options. For example, to scaffold a project from phat-contract-starter-kit template, run:

npx @phala/fn init my-phat-function -t phat-contract-starter-kit

Building your first Phat Function script

Installing dependencies

cd my-phat-function
yarn install
# or
npm install

Building the script

npx @phala/fn build src/index.ts

Testing the build script

npx @phala/fn run dist/index.js

Also, your can specify the script input parameters via -a flag:

npx @phala/fn run dist/index.js -a foo -a bar

Uploading the script to the Phat Contract

Prerequisites

• Active Phala Profile with version >= 1.0.1 via Phat Contract 2.0 UI
• RPC Endpoint for EVM Chain Mainnet & EVM Chain Testnet
  • Alchemy - This repo example uses Alchemy's API Key.
  • Infura
  • Personal RPC Node (Ex. ProjectPi)

Create a Phala Profile

This step requires you to have a Polkadot account. You can get an account from one of the following:

• Polkadot.js Wallet Extension
• Talisman Wallet
• SubWallet (Support for iOS/Android)

Then, create your Phala Profile account on the Phala Testnet or Phala Mainnet. Here is a quick 1 minute YouTube video on setting up from scratch.

Option 1: Upload the script via exported Polkadot account file

Go to your browser and click on the polkadot.js extension. Select your account and click "Export Account".

Next, you will be prompted for your password before saving the file to your project directory as polkadot-account.json .

Run the upload command:

npx @phala/fn upload -a polkadot-account.json

Then follow the prompts.

Option 2: Upload the script via mnemonic phrase

You can also upload the script via your Polkadot account mnemonic phrase.

npx @phala/fn upload --suri="raven valley laugh wait grid typical deny output discover situate bleak scare"

Option 3: Upload the script via environment variables

You can create a .env file in your project directory and define POLKADOT_WALLET_SURI="this is a mnemonic phrase".

Then run the upload command and follow the prompts:

npx @phala/fn upload

Updating your Phat Contract script

The update command is similar to the upload command. You can both update your script via account file or mnemonic phrase.

npx @phala/fn update -a polkadot-account.json

# or

npx @phala/fn update --suri="raven valley laugh wait grid typical deny output discover situate bleak scare"

Advance Usage

Testing the Phat Contract script via watch command

You can start a watching server via watch command, to watch the requests that are pushed and see how the Phat Contract transforms the data.

npx @phala/fn watch <Your Contract Address> <Your Contract JSON File> dist/index.js --rpc=<Your RPC Endpoint>

Example output

npx @phala/fn watch 0x0165878A594ca255338adfa4d48449f69242Eb8F artifacts/contracts/TestLensApiConsumerContract.sol.sol/TestLensApiConsumerContract.sol.json dist/index.js --rpc="http://127.0.0.1:8545/"

Listening for TestLensApiConsumerContract MessageQueued events...
Received event [MessageQueued]: {
  tail: 0n,
  data: '0x0000000000000000000000000000000000000000000000000000000000000001000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000043078303100000000000000000000000000000000000000000000000000000000'
}
handle req: 0x0000000000000000000000000000000000000000000000000000000000000001000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000043078303100000000000000000000000000000000000000000000000000000000
Request received for profile 0x01
response: 0,1,1597
JS Execution output: 0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001000000000000000000000000000000000000000000000000000000000000063d

Phat Function Script Examples

• HTTP Request
• Batch HTTP Request
• VIEM ABI Codec
• SCALE Codec
• Call pink.invokeContract
• Chainlink compatible VRF
• Randrange