StarknetAstro

StarknetAstro

(Starknet Shanghai Workshop)Cairo中ERC标准的实现:环境配置以及实操

52994791718314e29c662ab33aafc40c

简介#

本课程作为一个快速上手的 Workshop 将不会过于深入的讲解 Cairo 语言的特性(但我们在线 Bootcamp 最后一节课将深入的介绍一下 Cairo 语言其他有用的部分)。

如果你想提前深入学习 Cairo,可以查看我们最近翻译的Cairo-Book 中文版

环境配置#

最小安装选项:

系统:curl,git
IDE:VSCode 或任何你喜欢的编辑器(唯独不要使用 windows 自带的 notepad)
MacOS:homebrew
Cairo-Lang CLI。

安装 Rust#

建议通过 rustup (docs) 来安装 rust。rustup 可以切换 rust 版本和升级。

~ $ curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh

之后重启命令行终端即可验证是否安装成功,或者在终端内执行以下命令:

~ $ source "$HOME/.cargo/env"

验证版本

~ $ rustup --version
rustup 1.25.2 (17db695f1 2023-02-01)

如果你没有安装 curl,也可以在此处下载 rust 的各种系统的安装包

https://forge.rust-lang.org/infra/other-installation-methods.html#rustup

安装 Cairo#

在终端中输入如下命令,从 Github 上 Clone 最新的 Cairo repo

git clone https://github.com/starkware-libs/cairo/ ./cairo

接着我们使用稳定的 1.10 版本:

cd ./cairo
git checkout 1003d5d14c09191bbfb64ee318d1975584b3c819
git pull
cargo build --all --release

测试是否成功

cargo run --bin starknet-compile --help

或者

./target/release/starknet-compile --version

执行 .cairo 文件#

让我们先编写一个测试用 Cairo 文件。在当前目录下创建一个新的文件。
文件名为:hellostarknetastro.cairo

内容为:

use debug::PrintTrait;
fn main() {
    'Hello, StarknetAstro!'.print();
}

执行如下命令:

cargo run --bin cairo-run -- hellostarknetastro.cairo

或者使用上面编译好的 relese 中的来进行执行
target/release/cairo-run hellostarknetastro.cairo

这时,终端里会输出类似以下内容

[DEBUG]  Hello, StarknetAstro!  (raw: 105807143882116536446217580363080108601441594273569)

编译 .cairo 文件#

Cairo 自带了一些范例,我们可以用如下命令编译:
首先我们在 cairo 根目录下创建一个文件夹用来保存输出

mkdir output

之后使用 cargo 进行编译

cargo run --bin cairo-compile examples/fib.cairo output/fib.json

或者使用

target/release/cairo-compile examples/fib.cairo output/fib.json

这里我们输出的其实是中间代码, Cairo 称之为 Sierra。
如果想输出可以直接在 Cairo-VM 上执行的文件,我们需要进一步把 Sierra 编译称 Cairo 汇编(casm)文件。

cargo run --bin sierra-compile -- output/fib.json output/fib.casm

或者

target/release/sierra-compile -- output/fib.json output/fib.casm

当然,一般来说,只有需要部署到 starknet 上时才需要编译 Cairo 合约到 casm。无特殊需求我们一般不需要编译单纯的 Cairo 代码到 casm。

安装 Python#

旧 Cairo-CLI 需要的是 python 3.9 版本。为了避免和已经安装的冲突,和 rust 一样,我们推荐使用 python 版本管理工具 pyenv 来安装 python。

MacOS:

brew update
brew install pyenv

或者

curl https://pyenv.run | bash

之后

pyenv install 3.9
pyenv global 3.9

Linux:

curl https://pyenv.run | bash

之后

pyenv install 3.9
pyenv global 3.9

验证是否安装成功

python3.9 --version

或者直接简单的安装一个 py3.9 版本
https://www.python.org/downloads/release/python-3915/

安装 CLI#

此 CLI 用于部署 starknet 合约。我们需要先安装 GMP 环境支持

linux

sudo apt install -y libgmp3-dev

MACOS

brew install gmp

为了方便操作让我们先进入 Cairo 1.0 的根目录(此处参照你 Cairo 的安装目录,比如我的就是如下所示)

cd ~/cairo/

创建一个 camp1_lesson3 文件夹:

mkdir -p starknetastro/workshop/
cd starknetastro/workshop/

接着创建一个 python 虚拟环境:

python3.9 -m venv  venv

启动虚拟环境:

source venv/bin/activate

此时你应该可以看到终端的前面带上了一个(venv)。让我们安装 CLI

(venv) camp1 $ pip install cairo-lang==0.11.1.1

检验是否安装成功

(venv) camp1 $ starknet --version

这里应该输出:

starknet 0.11.1.1

常见问题#

很多同学在安装 python 后依然无法正常编译,在这里给出一些常见问题的解决方法:

  1. linker 'cc' not found,找不到 cc 的链接器,可用下面方案解决。
sudo apt install build-essential

当然为了以防万一,可以直接来一整套:

sudo apt-get install build-essential libncursesw5-dev libgdbm-dev libc6-dev zlib1g-dev libsqlite3-dev tk-dev libssl-dev openssl libbz2-dev libreadline-dev
  1. ModuleNotFoundError: No module named '_ctypes'
    解决方案比较麻烦,要重新安装 python。
pyenv uninstall 3.9.16
sudo yum install libffi-devel
pyenv install 3.9.16
  1. use_2to3 is invalid.有时候会莫名奇妙发生。
pip install -U setuptools

配置 Starknet 测试网账户#

接下来我们来配置测试网账户。首先先定义几个环境变量如下:

# 指定测试网
export STARKNET_NETWORK=alpha-goerli


# 设定默认钱包实现
export STARKNET_WALLET=starkware.starknet.wallets.open_zeppelin.OpenZeppelinAccount


# 指定编译器路径为Cairo 1的路径(请按照你自己的路径修改)
export CAIRO_COMPILER_DIR=~/cairo/target/release/

之后你可以将这个保存进你的 .zshrc或者 .bashrc,方便关闭 termianl 之后依然可以使用环境变量。方法此处不再赘述。

我们用以下两个命令来测试

(venv) $ $CAIRO_COMPILER_DIR/cairo-compile --version
cairo-lang-compile 1.1.0
(venv) $ $CAIRO_COMPILER_DIR/starknet-compile --version
cairo-lang-starknet 1.1.0

两者都输出 1.1.0 表示环境配置正确。

创建测试网的钱包#

接着我们来创建一个测试网上的钱包:

starknet new_account --account StarknetAstro

这里应该会输出

Account address: 0x你的地址
Public key: 0x你的公钥

Move the appropriate amount of funds to the account, and then deploy the account
by invoking the 'starknet deploy_account' command.

NOTE: This is a modified version of the OpenZeppelin account contract. The signature is computed
differently.

接着我们需要在测试网上部署它。在 Starknet 中部署也是一次交易,所以需要 gas。我们通过跨链桥或者官方 Faucet0x你的地址 发送一些测试用 eth。

スクリーンショット 2023-06-02 21.12.07

然后使用此命令部署

starknet deploy_account --account StarknetAstro

输出:

Sending the transaction with max_fee: 0.000114 ETH (113796902644445 WEI).
Sent deploy account contract transaction.

Contract address: 0x你的地址
Transaction hash: 0x交易地址

部署测试#

让我们先来用测试合约来尝试一下是否能够正常部署。
执行如下命令:

mkdir src sierra
touch src/example.cairo

之后,在 src/example.cairo 中填入测试内容:

#[contract]

mod SimpleStorage {
    #[storage]
    struct Storage {
    }
}

接着我们将 cairo 文件编译成 sierra 文件:

$CAIRO_COMPILER_DIR/starknet-compile src/example.cairo sierra/example.json

编译成功后,我们需要先声明一下合约的 ClassHash:

starknet declare --contract sierra/example.json --account StarknetAstro

当然,由于相同的 ClassHash 不能多次声明,这个测试用合约也早已被声明过,因此你会得到一个已经被声明的错误输出,这是没有问题的:

Got BadRequest while trying to access https://alpha4.starknet.io/feeder_gateway/simulate_transaction?blockNumber=pending&skipValidate=false. Status code: 500;
text: {"code": "StarknetErrorCode.CLASS_ALREADY_DECLARED",
"message": "Class with hash 0x695874cd8feed014ebe379df39aa0dcef861ff495cc5465e84927377fa8e7e6
is already declared.
0x317d3ac2cf840e487b6d0014a75f0cf507dff0bc143c710388e323487089bfa != 0”}.

接着我们来实际部署合约的 instance:

starknet deploy --class_hash 0x695874cd8feed014ebe379df39aa0dcef861ff495cc5465e84927377fa8e7e6 --account StarknetAstro

输出如下:

Sending the transaction with max_fee: 0.000132 ETH (132082306595047 WEI).
Invoke transaction for contract deployment was sent.
Contract address: 0x060e17c12d4e3fee8af2e28e6a310a3192a1b1190d060cb4324e234213d72b64
Transaction hash: 0x73f995d1fd9a05161e271f5ffb879bd70b79185a2b3de5536a289780387dd30

这表明实际部署成功了!你可以在这里看到我们部署的合约

ERC20 代码模版#

将下面的 erc20.cairo 保存在上面创建的 src中 ,方便终端操作。

文件名:erc20.cairo

use starknet::ContractAddress;

#[abi]
trait IERC20 {
    #[view]
    fn name() -> felt252;
    #[view]
    fn symbol() -> felt252;
    #[view]
    fn decimals() -> u8;
    #[view]
    fn totalSupply() -> u256;
    #[view]
    fn balanceOf(account: ContractAddress) -> u256;
    #[view]
    fn allowance(owner: ContractAddress, spender: ContractAddress) -> u256;
    #[external]
    fn transfer(recipient: ContractAddress, amount: u256) -> bool;
    #[external]
    fn transferFrom(sender: ContractAddress, recipient: ContractAddress, amount: u256) -> bool;
    #[external]
    fn approve(spender: ContractAddress, amount: u256) -> bool;
    #[external]
    fn increaseAllowance(spender: ContractAddress, added_value: u256) -> bool;
    #[external]
    fn decreaseAllowance(spender: ContractAddress, subtracted_value: u256) -> bool;
}

#[contract]
mod ERC20 {
    use super::IERC20;
    use integer::BoundedInt;
    use starknet::ContractAddress;
    use starknet::get_caller_address;
    use zeroable::Zeroable;

    struct Storage {
        _name: felt252,
        _symbol: felt252,
        _total_supply: u256,
        _balances: LegacyMap<ContractAddress, u256>,
        _allowances: LegacyMap<(ContractAddress, ContractAddress), u256>,
    }

    #[event]
    fn Transfer(from: ContractAddress, to: ContractAddress, value: u256) {}

    #[event]
    fn Approval(owner: ContractAddress, spender: ContractAddress, value: u256) {}

    impl ERC20 of IERC20 {
        fn name() -> felt252 {
            _name::read()
        }

        fn symbol() -> felt252 {
            _symbol::read()
        }

        fn decimals() -> u8 {
            18_u8
        }

        fn totalSupply() -> u256 {
            _total_supply::read()
        }

        fn balanceOf(account: ContractAddress) -> u256 {
            _balances::read(account)
        }

        fn allowance(owner: ContractAddress, spender: ContractAddress) -> u256 {
            _allowances::read((owner, spender))
        }

        fn transfer(recipient: ContractAddress, amount: u256) -> bool {
            let sender = get_caller_address();
            _transfer(sender, recipient, amount);
            true
        }

        fn transferFrom(
            sender: ContractAddress, recipient: ContractAddress, amount: u256
        ) -> bool {
            let caller = get_caller_address();
            _spend_allowance(sender, caller, amount);
            _transfer(sender, recipient, amount);
            true
        }

        fn approve(spender: ContractAddress, amount: u256) -> bool {
            let caller = get_caller_address();
            _approve(caller, spender, amount);
            true
        }

        fn increaseAllowance(spender: ContractAddress, added_value: u256) -> bool {
            _increase_allowance(spender, added_value)
        }

        fn decreaseAllowance(spender: ContractAddress, subtracted_value: u256) -> bool {
            _decrease_allowance(spender, subtracted_value)
        }
    }

    #[constructor]
    fn constructor(
        name: felt252, symbol: felt252, initial_supply: u256, recipient: ContractAddress
    ) {
        initializer(name, symbol);
        _mint(recipient, initial_supply);
    }

    #[view]
    fn name() -> felt252 {
        ERC20::name()
    }

    #[view]
    fn symbol() -> felt252 {
        ERC20::symbol()
    }

    #[view]
    fn decimals() -> u8 {
        ERC20::decimals()
    }

    #[view]
    fn totalSupply() -> u256 {
        ERC20::totalSupply()
    }

    #[view]
    fn balanceOf(account: ContractAddress) -> u256 {
        ERC20::balanceOf(account)
    }

    #[view]
    fn allowance(owner: ContractAddress, spender: ContractAddress) -> u256 {
        ERC20::allowance(owner, spender)
    }

    #[external]
    fn transfer(recipient: ContractAddress, amount: u256) -> bool {
        ERC20::transfer(recipient, amount)
    }

    #[external]
    fn transferFrom(sender: ContractAddress, recipient: ContractAddress, amount: u256) -> bool {
        ERC20::transferFrom(sender, recipient, amount)
    }

    #[external]
    fn approve(spender: ContractAddress, amount: u256) -> bool {
        ERC20::approve(spender, amount)
    }

    #[external]
    fn increaseAllowance(spender: ContractAddress, added_value: u256) -> bool {
        ERC20::increaseAllowance(spender, added_value)
    }

    #[external]
    fn decreaseAllowance(spender: ContractAddress, subtracted_value: u256) -> bool {
        ERC20::decreaseAllowance(spender, subtracted_value)
    }

    ///
    /// Internals
    ///

    #[internal]
    fn initializer(name_: felt252, symbol_: felt252) {
        _name::write(name_);
        _symbol::write(symbol_);
    }

    #[internal]
    fn _increase_allowance(spender: ContractAddress, added_value: u256) -> bool {
        let caller = get_caller_address();
        _approve(caller, spender, _allowances::read((caller, spender)) + added_value);
        true
    }

    #[internal]
    fn _decrease_allowance(spender: ContractAddress, subtracted_value: u256) -> bool {
        let caller = get_caller_address();
        _approve(caller, spender, _allowances::read((caller, spender)) - subtracted_value);
        true
    }

    #[internal]
    fn _mint(recipient: ContractAddress, amount: u256) {
        assert(!recipient.is_zero(), 'ERC20: mint to 0');
        _total_supply::write(_total_supply::read() + amount);
        _balances::write(recipient, _balances::read(recipient) + amount);
        Transfer(Zeroable::zero(), recipient, amount);
    }

    #[internal]
    fn _burn(account: ContractAddress, amount: u256) {
        assert(!account.is_zero(), 'ERC20: burn from 0');
        _total_supply::write(_total_supply::read() - amount);
        _balances::write(account, _balances::read(account) - amount);
        Transfer(account, Zeroable::zero(), amount);
    }

    #[internal]
    fn _approve(owner: ContractAddress, spender: ContractAddress, amount: u256) {
        assert(!owner.is_zero(), 'ERC20: approve from 0');
        assert(!spender.is_zero(), 'ERC20: approve to 0');
        _allowances::write((owner, spender), amount);
        Approval(owner, spender, amount);
    }

    #[internal]
    fn _transfer(sender: ContractAddress, recipient: ContractAddress, amount: u256) {
        assert(!sender.is_zero(), 'ERC20: transfer from 0');
        assert(!recipient.is_zero(), 'ERC20: transfer to 0');
        _balances::write(sender, _balances::read(sender) - amount);
        _balances::write(recipient, _balances::read(recipient) + amount);
        Transfer(sender, recipient, amount);
    }

    #[internal]
    fn _spend_allowance(owner: ContractAddress, spender: ContractAddress, amount: u256) {
        let current_allowance = _allowances::read((owner, spender));
        if current_allowance != BoundedInt::max() {
            _approve(owner, spender, current_allowance - amount);
        }
    }
}

部署 ERC20#

首先我们依然需要编译 cairo 文件到 sierra

$CAIRO_COMPILER_DIR/starknet-compile src/erc20.cairo sierra/erc20.json

接下来是声明

starknet declare --contract sierra/erc20.json --account StarknetAstro

这次的输出不一样了,因为我们编写的这个 erc20 文件还没有人部署过,因此不会出现错误(当然,照着课程做的同学们还是会遇上已经被声明的错误)。

Contract class hash: 0x580e15048e1a124d1ce0579c299391b8583bc167dc64768bb99f95af0d9e2b6
Transaction hash: 0x74680a930e3999195bb534c26b7a7c8ce00b357ddccd3681378a0d9b1e01d5c

接着则是 Deploy 这个 erc20 合约的 instance。注意 erc20 代码中的构造函数是有参数的,因此我们也需要给出相应的参数:

starknet deploy --inputs 0x417374726F546F6B656E 0x417374726F 0x3e8 0x0 0x01d4557fb129128c4db7a1d8049cbba4779e5aa64798cec7aea1a477a489d695 --class_hash 0x0580e15048e1a124d1ce0579c299391b8583bc167dc64768bb99f95af0d9e2b6 --account StarknetAstro

输出为:

Sending the transaction with max_fee: 0.000009 ETH (8827510645965 WEI).
Invoke transaction for contract deployment was sent.
Contract address: 0x010d93ff677abe100d6577d5e96416a01aa5c212f8012b105444c3efde20a95f
Transaction hash: 0x6e87fd6b23af80f59e21127ad0e54e5526062970d4a420e8e79d7e6911f992

大功告成!你可以在这里看到我们 部署的合约

ERC721 代码模版#

将下面的 erc721.cairo 保存在上面创建的 src中 ,方便终端操作。

文件名:erc721.cairo

use array::ArrayTrait;
use array::SpanTrait;
use option::OptionTrait;
use serde::Serde;
use serde::deserialize_array_helper;
use serde::serialize_array_helper;
use starknet::ContractAddress;

const IERC165_ID: u32 = 0x01ffc9a7_u32;
const IERC721_ID: u32 = 0x80ac58cd_u32;
const IERC721_METADATA_ID: u32 = 0x5b5e139f_u32;
const IERC721_RECEIVER_ID: u32 = 0x150b7a02_u32;


#[abi]
trait IERC721 {
    fn balance_of(account: ContractAddress) -> u256;
    fn owner_of(token_id: u256) -> ContractAddress;
    fn transfer_from(from: ContractAddress, to: ContractAddress, token_id: u256);
    fn safe_transfer_from(
        from: ContractAddress, to: ContractAddress, token_id: u256, data: Span<felt252>
    );
    fn approve(to: ContractAddress, token_id: u256);
    fn set_approval_for_all(operator: ContractAddress, approved: bool);
    fn get_approved(token_id: u256) -> ContractAddress;
    fn is_approved_for_all(owner: ContractAddress, operator: ContractAddress) -> bool;
    // IERC721Metadata
    fn name() -> felt252;
    fn symbol() -> felt252;
    fn token_uri(token_id: u256) -> felt252;
}

#[abi]
trait IERC721Camel {
    fn balanceOf(account: ContractAddress) -> u256;
    fn ownerOf(tokenId: u256) -> ContractAddress;
    fn transferFrom(from: ContractAddress, to: ContractAddress, tokenId: u256);
    fn safeTransferFrom(
        from: ContractAddress, to: ContractAddress, tokenId: u256, data: Span<felt252>
    );
    fn approve(to: ContractAddress, tokenId: u256);
    fn setApprovalForAll(operator: ContractAddress, approved: bool);
    fn getApproved(tokenId: u256) -> ContractAddress;
    fn isApprovedForAll(owner: ContractAddress, operator: ContractAddress) -> bool;
    // IERC721Metadata
    fn name() -> felt252;
    fn symbol() -> felt252;
    fn tokenUri(tokenId: u256) -> felt252;
}

#[abi]
trait IASTRONFT  {
    fn mint(to: ContractAddress, token_id: u256);
}

//
// ERC721Receiver
//

#[abi]
trait IERC721ReceiverABI {
    fn on_erc721_received(
        operator: ContractAddress, from: ContractAddress, token_id: u256, data: Span<felt252>
    ) -> u32;
    fn onERC721Received(
        operator: ContractAddress, from: ContractAddress, tokenId: u256, data: Span<felt252>
    ) -> u32;
}

#[abi]
trait IERC721Receiver {
    fn on_erc721_received(
        operator: ContractAddress, from: ContractAddress, token_id: u256, data: Span<felt252>
    ) -> u32;
}

#[abi]
trait IERC721ReceiverCamel {
    fn onERC721Received(
        operator: ContractAddress, from: ContractAddress, tokenId: u256, data: Span<felt252>
    ) -> u32;
}

#[abi]
trait ERC721ABI {
    // case agnostic
    #[view]
    fn name() -> felt252;
    #[view]
    fn symbol() -> felt252;
    #[external]
    fn approve(to: ContractAddress, token_id: u256);
    // snake_case
    #[view]
    fn balance_of(account: ContractAddress) -> u256;
    #[view]
    fn owner_of(token_id: u256) -> ContractAddress;
    #[external]
    fn transfer_from(from: ContractAddress, to: ContractAddress, token_id: u256);
    #[external]
    fn safe_transfer_from(
        from: ContractAddress, to: ContractAddress, token_id: u256, data: Span<felt252>
    );
    #[external]
    fn set_approval_for_all(operator: ContractAddress, approved: bool);
    #[view]
    fn get_approved(token_id: u256) -> ContractAddress;
    #[view]
    fn is_approved_for_all(owner: ContractAddress, operator: ContractAddress) -> bool;
    #[view]
    fn token_uri(token_id: u256) -> felt252;
    // camelCase
    #[view]
    fn balanceOf(account: ContractAddress) -> u256;
    #[view]
    fn ownerOf(tokenId: u256) -> ContractAddress;
    #[external]
    fn transferFrom(from: ContractAddress, to: ContractAddress, tokenId: u256);
    #[external]
    fn safeTransferFrom(
        from: ContractAddress, to: ContractAddress, tokenId: u256, data: Span<felt252>
    );
    #[external]
    fn setApprovalForAll(operator: ContractAddress, approved: bool);
    #[view]
    fn getApproved(tokenId: u256) -> ContractAddress;
    #[view]
    fn isApprovedForAll(owner: ContractAddress, operator: ContractAddress) -> bool;
    #[view]
    fn tokenUri(tokenId: u256) -> felt252;
}

#[abi]
trait ASTRONFTABI {
    #[external]
    fn mint(to: ContractAddress, token_id: u256);
}


#[contract]
mod ERC721 {
    use super::IERC721;
    use super::IERC721Camel;
    use super::IASTRONFT;

    // Other
    use starknet::ContractAddress;
    use starknet::get_caller_address;
    use zeroable::Zeroable;
    use option::OptionTrait;
    use array::SpanTrait;
    use traits::Into;
    use super::SpanSerde;

    struct Storage {
        _name: felt252,
        _symbol: felt252,
        _owners: LegacyMap<u256, ContractAddress>,
        _balances: LegacyMap<ContractAddress, u256>,
        _token_approvals: LegacyMap<u256, ContractAddress>,
        _operator_approvals: LegacyMap<(ContractAddress, ContractAddress), bool>,
        _token_uri: LegacyMap<u256, felt252>,
    }

    #[event]
    fn Transfer(from: ContractAddress, to: ContractAddress, token_id: u256) {}

    #[event]
    fn Approval(owner: ContractAddress, approved: ContractAddress, token_id: u256) {}

    #[event]
    fn ApprovalForAll(owner: ContractAddress, operator: ContractAddress, approved: bool) {}

    #[constructor]
    fn constructor(name: felt252, symbol: felt252) {
        initializer(name, symbol);
    }

    impl IASTRONFTImpl of IASTRONFT {
        fn mint(to: ContractAddress, token_id: u256) {
            _mint(to, token_id);
        }
    }

    impl ERC721Impl of IERC721 {
        fn name() -> felt252 {
            _name::read()
        }

        fn symbol() -> felt252 {
            _symbol::read()
        }

        fn token_uri(token_id: u256) -> felt252 {
            assert(_exists(token_id), 'ERC721: invalid token ID');
            _token_uri::read(token_id)
        }

        fn balance_of(account: ContractAddress) -> u256 {
            assert(!account.is_zero(), 'ERC721: invalid account');
            _balances::read(account)
        }

        fn owner_of(token_id: u256) -> ContractAddress {
            _owner_of(token_id)
        }

        fn get_approved(token_id: u256) -> ContractAddress {
            assert(_exists(token_id), 'ERC721: invalid token ID');
            _token_approvals::read(token_id)
        }

        fn is_approved_for_all(owner: ContractAddress, operator: ContractAddress) -> bool {
            _operator_approvals::read((owner, operator))
        }

        fn approve(to: ContractAddress, token_id: u256) {
            let owner = _owner_of(token_id);

            let caller = get_caller_address();
            assert(
                owner == caller | is_approved_for_all(owner, caller), 'ERC721: unauthorized caller'
            );
            _approve(to, token_id);
        }

        fn set_approval_for_all(operator: ContractAddress, approved: bool) {
            _set_approval_for_all(get_caller_address(), operator, approved)
        }

        fn transfer_from(from: ContractAddress, to: ContractAddress, token_id: u256) {
            assert(
                _is_approved_or_owner(get_caller_address(), token_id), 'ERC721: unauthorized caller'
            );
            _transfer(from, to, token_id);
        }

        fn safe_transfer_from(
            from: ContractAddress, to: ContractAddress, token_id: u256, data: Span<felt252>
        ) {
            assert(
                _is_approved_or_owner(get_caller_address(), token_id), 'ERC721: unauthorized caller'
            );
            _safe_transfer(from, to, token_id, data);
        }
    }

    impl ERC721CamelImpl of IERC721Camel {
        fn name() -> felt252 {
            ERC721Impl::name()
        }

        fn symbol() -> felt252 {
            ERC721Impl::symbol()
        }

        fn tokenUri(tokenId: u256) -> felt252 {
            ERC721Impl::token_uri(tokenId)
        }

        fn balanceOf(account: ContractAddress) -> u256 {
            ERC721Impl::balance_of(account)
        }

        fn ownerOf(tokenId: u256) -> ContractAddress {
            ERC721Impl::owner_of(tokenId)
        }

        fn approve(to: ContractAddress, tokenId: u256) {
            ERC721Impl::approve(to, tokenId)
        }

        fn getApproved(tokenId: u256) -> ContractAddress {
            ERC721Impl::get_approved(tokenId)
        }

        fn isApprovedForAll(owner: ContractAddress, operator: ContractAddress) -> bool {
            ERC721Impl::is_approved_for_all(owner, operator)
        }

        fn setApprovalForAll(operator: ContractAddress, approved: bool) {
            ERC721Impl::set_approval_for_all(operator, approved)
        }

        fn transferFrom(from: ContractAddress, to: ContractAddress, tokenId: u256) {
            ERC721Impl::transfer_from(from, to, tokenId)
        }

        fn safeTransferFrom(
            from: ContractAddress, to: ContractAddress, tokenId: u256, data: Span<felt252>
        ) {
            ERC721Impl::safe_transfer_from(from, to, tokenId, data)
        }
    }

    // View

    #[view]
    fn supports_interface(interface_id: u32) -> bool {
        if super::IERC165_ID == interface_id {
            return true;
        } else if super::IERC721_METADATA_ID == interface_id {
            return true;
        } else {
            return super::IERC721_ID == interface_id;
        }
    }

    #[view]
    fn supportsInterface(interfaceId: u32) -> bool {
        if super::IERC165_ID == interfaceId {
            return true;
        } else if super::IERC721_METADATA_ID == interfaceId {
            return true;
        } else {
            return super::IERC721_ID == interfaceId;
        }
    }

    #[view]
    fn name() -> felt252 {
        ERC721Impl::name()
    }

    #[view]
    fn symbol() -> felt252 {
        ERC721Impl::symbol()
    }

    #[view]
    fn token_uri(token_id: u256) -> felt252 {
        ERC721Impl::token_uri(token_id)
    }

    #[view]
    fn tokenUri(tokenId: u256) -> felt252 {
        ERC721CamelImpl::tokenUri(tokenId)
    }

    #[view]
    fn balance_of(account: ContractAddress) -> u256 {
        ERC721Impl::balance_of(account)
    }

    #[view]
    fn balanceOf(account: ContractAddress) -> u256 {
        ERC721CamelImpl::balanceOf(account)
    }

    #[view]
    fn owner_of(token_id: u256) -> ContractAddress {
        ERC721Impl::owner_of(token_id)
    }

    #[view]
    fn ownerOf(tokenId: u256) -> ContractAddress {
        ERC721CamelImpl::ownerOf(tokenId)
    }

    #[view]
    fn get_approved(token_id: u256) -> ContractAddress {
        ERC721Impl::get_approved(token_id)
    }

    #[view]
    fn getApproved(tokenId: u256) -> ContractAddress {
        ERC721CamelImpl::getApproved(tokenId)
    }

    #[view]
    fn is_approved_for_all(owner: ContractAddress, operator: ContractAddress) -> bool {
        ERC721Impl::is_approved_for_all(owner, operator)
    }

    #[view]
    fn isApprovedForAll(owner: ContractAddress, operator: ContractAddress) -> bool {
        ERC721CamelImpl::isApprovedForAll(owner, operator)
    }

    // External

    #[external]
    fn approve(to: ContractAddress, token_id: u256) {
        ERC721Impl::approve(to, token_id)
    }

    #[external]
    fn set_approval_for_all(operator: ContractAddress, approved: bool) {
        ERC721Impl::set_approval_for_all(operator, approved)
    }

    #[external]
    fn setApprovalForAll(operator: ContractAddress, approved: bool) {
        ERC721CamelImpl::setApprovalForAll(operator, approved)
    }

    #[external]
    fn transfer_from(from: ContractAddress, to: ContractAddress, token_id: u256) {
        ERC721Impl::transfer_from(from, to, token_id)
    }

    #[external]
    fn transferFrom(from: ContractAddress, to: ContractAddress, tokenId: u256) {
        ERC721CamelImpl::transferFrom(from, to, tokenId)
    }

    #[external]
    fn safe_transfer_from(
        from: ContractAddress, to: ContractAddress, token_id: u256, data: Span<felt252>
    ) {
        ERC721Impl::safe_transfer_from(from, to, token_id, data)
    }

    #[external]
    fn safeTransferFrom(
        from: ContractAddress, to: ContractAddress, tokenId: u256, data: Span<felt252>
    ) {
        ERC721CamelImpl::safeTransferFrom(from, to, tokenId, data)
    }

    #[external]
    fn mint(to: ContractAddress, token_id: u256) {
            IASTRONFTImpl::mint(to, token_id);
    }
    
    // Internal

    #[internal]
    fn initializer(name_: felt252, symbol_: felt252) {
        _name::write(name_);
        _symbol::write(symbol_);
    }

    #[internal]
    fn _owner_of(token_id: u256) -> ContractAddress {
        let owner = _owners::read(token_id);
        match owner.is_zero() {
            bool::False(()) => owner,
            bool::True(()) => panic_with_felt252('ERC721: invalid token ID')
        }
    }

    #[internal]
    fn _exists(token_id: u256) -> bool {
        !_owners::read(token_id).is_zero()
    }

    #[internal]
    fn _is_approved_or_owner(spender: ContractAddress, token_id: u256) -> bool {
        let owner = _owner_of(token_id);
        owner == spender | is_approved_for_all(owner, spender) | spender == get_approved(token_id)
    }

    #[internal]
    fn _approve(to: ContractAddress, token_id: u256) {
        let owner = _owner_of(token_id);
        assert(owner != to, 'ERC721: approval to owner');
        _token_approvals::write(token_id, to);
        Approval(owner, to, token_id);
    }

    #[internal]
    fn _set_approval_for_all(owner: ContractAddress, operator: ContractAddress, approved: bool) {
        assert(owner != operator, 'ERC721: self approval');
        _operator_approvals::write((owner, operator), approved);
        ApprovalForAll(owner, operator, approved);
    }

    #[internal]
    fn _mint(to: ContractAddress, token_id: u256) {
        assert(!to.is_zero(), 'ERC721: invalid receiver');
        assert(!_exists(token_id), 'ERC721: token already minted');

        // Update balances
        _balances::write(to, _balances::read(to) + 1.into());

        // Update token_id owner
        _owners::write(token_id, to);

        // Emit event
        Transfer(Zeroable::zero(), to, token_id);
    }

    #[internal]
    fn _transfer(from: ContractAddress, to: ContractAddress, token_id: u256) {
        assert(!to.is_zero(), 'ERC721: invalid receiver');
        let owner = _owner_of(token_id);
        assert(from == owner, 'ERC721: wrong sender');

        // Implicit clear approvals, no need to emit an event
        _token_approvals::write(token_id, Zeroable::zero());

        // Update balances
        _balances::write(from, _balances::read(from) - 1.into());
        _balances::write(to, _balances::read(to) + 1.into());

        // Update token_id owner
        _owners::write(token_id, to);

        // Emit event
        Transfer(from, to, token_id);
    }

    #[internal]
    fn _burn(token_id: u256) {
        let owner = _owner_of(token_id);

        // Implicit clear approvals, no need to emit an event
        _token_approvals::write(token_id, Zeroable::zero());

        // Update balances
        _balances::write(owner, _balances::read(owner) - 1.into());

        // Delete owner
        _owners::write(token_id, Zeroable::zero());

        // Emit event
        Transfer(owner, Zeroable::zero(), token_id);
    }

    #[internal]
    fn _safe_mint(to: ContractAddress, token_id: u256, data: Span<felt252>) {
        _mint(to, token_id);
    }

    #[internal]
    fn _safe_transfer(
        from: ContractAddress, to: ContractAddress, token_id: u256, data: Span<felt252>
    ) {
        _transfer(from, to, token_id);
    }

    #[internal]
    fn _set_token_uri(token_id: u256, token_uri: felt252) {
        assert(_exists(token_id), 'ERC721: invalid token ID');
        _token_uri::write(token_id, token_uri)
    }
}

impl SpanSerde<
    T, impl TSerde: Serde<T>, impl TCopy: Copy<T>, impl TDrop: Drop<T>
> of Serde<Span<T>> {
    fn serialize(self: @Span<T>, ref output: Array<felt252>) {
        (*self).len().serialize(ref output);
        serialize_array_helper(*self, ref output);
    }
    fn deserialize(ref serialized: Span<felt252>) -> Option<Span<T>> {
        let length = *serialized.pop_front()?;
        let mut arr = ArrayTrait::new();
        Option::Some(deserialize_array_helper(ref serialized, arr, length)?.span())
    }
}

部署 ERC721#

首先我们依然需要编译 cairo 文件到 sierra

$CAIRO_COMPILER_DIR/starknet-compile src/erc721.cairo sierra/erc721.json

接下来是声明

starknet declare --contract sierra/erc721.json --account StarknetAstro

这次的输出不一样了,因为我们编写的这个 erc721 文件还没有人部署过,因此不会出现错误(当然,照着课程做的同学们还是会遇上已经被声明的错误)。

Sending the transaction with max_fee: 0.000001 ETH (1378300012405 WEI).
Declare transaction was sent.
Contract class hash: 0x49f6ecc90497560cb72901c514407cb91a42cc5d8868b2d348ba0264067c94c
Transaction hash: 0x24999e08268d91439d75c251bf0e86ad4abc633d9f03ac2ca1eb00d421d3c54

接着则是 Deploy 这个 erc721 合约的 instance。注意 erc721 代码中的构造函数是有参数的,因此我们也需要给出相应的参数:

starknet deploy --inputs 0x417374726F546F6B656E 0x417374726F --class_hash 0x49f6ecc90497560cb72901c514407cb91a42cc5d8868b2d348ba0264067c94c --account StarknetAstro

输出为:

Sending the transaction with max_fee: 0.000006 ETH (6121500055094 WEI).
Invoke transaction for contract deployment was sent.
Contract address: 0x06722e748113c467542ad7f9985fdf2dd81c2b92088fc832dc7845c13d2eff41
Transaction hash: 0x40bd533e6e2503f05c20f1abfc584aaf03075dee9659278ec6674195f4d2795

大功告成!你可以在这里看到我们 部署的合约

加载中...
此文章数据所有权由区块链加密技术和智能合约保障仅归创作者所有。