@nethermindeth/warp

Warp

Warp brings Solidity to Starknet, making it possible to transpile Ethereum smart contracts to Starknet Cairo Contracts.

Note: Cairo 1 support is being developed at this branch.

Quickstart

Docker compose provides a ready to use environment featuring warp and devnet.

Note: Executing Warp using Docker works only for x86 architecture, ARM architectures (such as Apple's M1) will be supported soon.

Build and run containers

docker-compose up

Transpile

docker-compose exec warp warp transpile exampleContracts/ERC20.sol

It's best to copy the contract/repo to the warp directory so it is available in container via volume. Use contract's paths relative to warp root. For example, assuming you've copied your project to warp/projects/myproject you can replace exampleContracts/ERC20.sol with projects/myproject/mycontract.sol in the above command.

Deploy to devnet

docker-compose exec warp warp compile warp_output/example__contracts/ERC20__WC__WARP.cairo
docker-compose exec warp starknet deploy --no_wallet --contract warp_output/example__contracts/ERC20__WC__WARP_compiled.json --gateway_url http://devnet:5050

Documentation

You can read the documentation here.

Installation

To install Warp follow the installation instructions here.

To build Warp for development see the contributing guidelines.

Usage

If you have used installation method 1 you can use the warp command in any folder. If you have used installation method 2, you will have to specify the path to the warp directory followed by bin/warp e.g path_to_warp_repo/bin/warp ...

Starknet setup

Select your network and wallet types. It's recommended to set these as environment variables but they can also be passed as explicit arguments to the Warp CLI and the Starknet CLI.

export STARKNET_WALLET=starkware.starknet.wallets.open_zeppelin.OpenZeppelinAccount
export STARKNET_NETWORK=alpha-goerli

Make sure you have a Starknet account set up, if you have not done so yet please:

warp deploy_account

CLI Commands

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To transpile a Solidity contract:

warp transpile <path to Solidity contract>

To declare a Starknet contract:

warp declare <path to Starknet contract>

Please note to deploy a contract you will first have to declare it.

To deploy a Starknet contract:

warp deploy <path to Starknet contract>

The deploy command will generate the compiled json file as well as the abi json file. Use warp deploy --help command to see more deployment options.

Libraries

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Libraries are bundled into the point of use, therefore if you try transpile a standalone library it will result in no output. If you would like to transpile and deploy a standalone library please alter its declaration to `contract`.

Unsupported Solidity Features

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Several features of Solidity are not supported/do not have analogs in Starknet yet. We will try our best to add these features as Starknet supports them, but some may not be possible due to fundamental differences in the platforms.

Please see the list below:

Support Status	Symbol
Will likely never be supported
Being developed/investigated
Currently Unknown/If added in Cairo

Solidity	Support Status
fallback functions with args
delegate calls
indexed arrays in event
low level calls
nested tuple expressions
gasleft()
msg.value
msg.sig
msg.data
tx.gasprice
tx.origin
try/catch
block.coinbase
block.gaslimit
block.basefee
block.chainid
block.difficulty
precompiles (apart from ecrecover)
selfdestruct
blockhash
functions pointers in storage
sha256 (use keccak256 instead)
receive
Inline Yul Assembly - (memory, calldata, storage)
user defined errors
function call options e.g x.f{gas: 10000}(arg1)
member access of address object e.g address.balance
nested tuple assignments

Note: We have changed the return of ecrecover to be uint160 because we use the address type for Starknet addresses.

Docker

Note: Executing Warp using Docker works only for x86 architecture, ARM architectures (such as Apple's M1) will be supported soon.

Build the image from source:

docker build -t warp .

Run the container with the same options and arguments as the Warp binary:

docker run --rm -v $PWD:/dapp --user $(id -u):$(id -g) warp transpile exampleContracts/ERC20.sol

Contributing

You can read about contributing, first steps, development tips and testing for contributors here

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