8000 feat(werc20): WERC20 transactions by fedekunze · Pull Request #1991 · evmos/evmos · GitHub
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feat(werc20): WERC20 transactions #1991

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Merged
merged 3 commits into from
Nov 3, 2023
Merged

feat(werc20): WERC20 transactions #1991

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feat(werc20): WERC20 transactions
fedekunze Nov 3, 2023
30e93c9
changelog
fedekunze Nov 3, 2023
773af3b
Merge branch 'fedekunze/werc20-events' into fedekunze/werc20-txs
fedekunze Nov 3, 2023
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8000
1 change: 1 addition & 0 deletions CHANGELOG.md
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Expand Up @@ -40,6 +40,7 @@ Ref: https://keepachangelog.com/en/1.0.0/
### Features

- (p256) [#1922](https://github.com/evmos/evmos/pull/1922) [EIP-7212](https://eips.ethereum.org/EIPS/eip-7212) `secp256r1` curve precompile
- (werc20) [#1991](https://github.com/evmos/evmos/pull/1991) Add WERC-20 Precompile transactions.

### Improvements

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46 changes: 46 additions & 0 deletions precompiles/werc20/tx.go
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Expand Up @@ -3,6 +3,12 @@

package werc20

import (
sdk "github.com/cosmos/cosmos-sdk/types"
"github.com/ethereum/go-ethereum/accounts/abi"
"github.com/ethereum/go-ethereum/core/vm"
)

const (
// DepositMethod defines the ABI method name for the IWERC20 deposit
// transaction.
Expand All @@ -11,3 +17,43 @@ const (
// transaction.
WithdrawMethod = "withdraw"
)

// Deposit is a no-op and mock function that provides the same interface as the
// WETH contract to support equality between the native coin and its wrapped
// ERC-20 (eg. EVMOS and WEVMOS). It only emits the Deposit event.
func (p Precompile) Deposit(
ctx sdk.Context,
contract *vm.Contract,
stateDB vm.StateDB,
_ *abi.Method,
_ []interface{},
) ([]byte, error) {
dst := contract.Caller()
amount := contract.Value()

if err := p.EmitDepositEvent(ctx, stateDB, dst, amount); err != nil {
return nil, err
}

return nil, nil
}

// Withdraw is a no-op and mock function that provides the same interface as the
// WETH contract to support equality between the native coin and its wrapped
// ERC-20 (eg. EVMOS and WEVMOS). It only emits the Withdraw event.
func (p Precompile) Withdraw(
ctx sdk.Context,
contract *vm.Contract,
stateDB vm.StateDB,
_ *abi.Method,
_ []interface{},
) ([]byte, error) {
src := contract.Caller()
amount := contract.Value()

if err := p.EmitWithdrawEvent(ctx, stateDB, src, amount); err != nil {
return nil, err
}

return nil, nil
}
0