status-im/status-go

package pathprocessor

import (
    "fmt"
    "math/big"

    ethTypes "github.com/ethereum/go-ethereum/core/types"

    "github.com/ethereum/go-ethereum/accounts/abi/bind"
    "github.com/ethereum/go-ethereum/common"
    "github.com/status-im/status-go/account"
    "github.com/status-im/status-go/eth-node/types"
)

func getSigner(chainID uint64, from types.Address, verifiedAccount *account.SelectedExtKey) bind.SignerFn {
    return func(addr common.Address, tx *ethTypes.Transaction) (*ethTypes.Transaction, error) {
        s := ethTypes.NewLondonSigner(new(big.Int).SetUint64(chainID))
        return ethTypes.SignTx(tx, s, verifiedAccount.AccountKey.PrivateKey)
    }
}

func makeKey(fromChain, toChain uint64, fromTokenSymbol, toTokenSymbol string) string {
    if fromTokenSymbol != "" || toTokenSymbol != "" {
        return fmt.Sprintf("%d-%d-%s-%s", fromChain, toChain, fromTokenSymbol, toTokenSymbol)
    }
    return fmt.Sprintf("%d-%d", fromChain, toChain)
}