laconicd/x/evm/handler.go
2019-10-30 14:39:46 -04:00

118 lines
3.3 KiB
Go

package evm
import (
"fmt"
"math/big"
"github.com/ethereum/go-ethereum/common"
sdk "github.com/cosmos/cosmos-sdk/types"
authutils "github.com/cosmos/cosmos-sdk/x/auth/client/utils"
emint "github.com/cosmos/ethermint/types"
"github.com/cosmos/ethermint/x/evm/types"
tm "github.com/tendermint/tendermint/types"
)
// NewHandler returns a handler for Ethermint type messages.
func NewHandler(keeper Keeper) sdk.Handler {
return func(ctx sdk.Context, msg sdk.Msg) sdk.Result {
switch msg := msg.(type) {
case types.EthereumTxMsg:
return handleETHTxMsg(ctx, keeper, msg)
case *types.EmintMsg:
return handleEmintMsg(ctx, keeper, *msg)
default:
errMsg := fmt.Sprintf("Unrecognized ethermint Msg type: %v", msg.Type())
return sdk.ErrUnknownRequest(errMsg).Result()
}
}
}
// Handle an Ethereum specific tx
func handleETHTxMsg(ctx sdk.Context, keeper Keeper, msg types.EthereumTxMsg) sdk.Result {
if err := msg.ValidateBasic(); err != nil {
return err.Result()
}
// parse the chainID from a string to a base-10 integer
intChainID, ok := new(big.Int).SetString(ctx.ChainID(), 10)
if !ok {
return emint.ErrInvalidChainID(fmt.Sprintf("invalid chainID: %s", ctx.ChainID())).Result()
}
// Verify signature and retrieve sender address
sender, err := msg.VerifySig(intChainID)
if err != nil {
return emint.ErrInvalidSender(err.Error()).Result()
}
// Encode transaction by default Tx encoder
txEncoder := authutils.GetTxEncoder(types.ModuleCdc)
txBytes, err := txEncoder(msg)
if err != nil {
return sdk.ErrInternal(err.Error()).Result()
}
txHash := tm.Tx(txBytes).Hash()
ethHash := common.BytesToHash(txHash)
st := types.StateTransition{
Sender: sender,
AccountNonce: msg.Data.AccountNonce,
Price: msg.Data.Price,
GasLimit: msg.Data.GasLimit,
Recipient: msg.Data.Recipient,
Amount: msg.Data.Amount,
Payload: msg.Data.Payload,
Csdb: keeper.csdb.WithContext(ctx),
ChainID: intChainID,
THash: &ethHash,
Simulate: ctx.IsCheckTx(),
}
// Prepare db for logs
keeper.csdb.Prepare(ethHash, common.Hash{}, keeper.txCount.get())
keeper.txCount.increment()
bloom, res := st.TransitionCSDB(ctx)
if res.IsOK() {
keeper.bloom.Or(keeper.bloom, bloom)
}
return res
}
func handleEmintMsg(ctx sdk.Context, keeper Keeper, msg types.EmintMsg) sdk.Result {
if err := msg.ValidateBasic(); err != nil {
return err.Result()
}
// parse the chainID from a string to a base-10 integer
intChainID, ok := new(big.Int).SetString(ctx.ChainID(), 10)
if !ok {
return emint.ErrInvalidChainID(fmt.Sprintf("invalid chainID: %s", ctx.ChainID())).Result()
}
st := types.StateTransition{
Sender: common.BytesToAddress(msg.From.Bytes()),
AccountNonce: msg.AccountNonce,
Price: msg.Price.BigInt(),
GasLimit: msg.GasLimit,
Amount: msg.Amount.BigInt(),
Payload: msg.Payload,
Csdb: keeper.csdb.WithContext(ctx),
ChainID: intChainID,
Simulate: ctx.IsCheckTx(),
}
if msg.Recipient != nil {
to := common.BytesToAddress(msg.Recipient.Bytes())
st.Recipient = &to
}
// Prepare db for logs
keeper.csdb.Prepare(common.Hash{}, common.Hash{}, keeper.txCount.get()) // Cannot provide tx hash
keeper.txCount.increment()
_, res := st.TransitionCSDB(ctx)
return res
}