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Merge pull request #34 from KyberNetwork/feat/eth/simulator
feat: ✨ eth: simulator
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,71 @@ | ||
| package eth | ||
|
|
||
| import ( | ||
| "context" | ||
| "fmt" | ||
| "math/big" | ||
|
|
||
| "github.com/ethereum/go-ethereum" | ||
| "github.com/ethereum/go-ethereum/common" | ||
| "github.com/ethereum/go-ethereum/common/hexutil" | ||
| "github.com/ethereum/go-ethereum/ethclient/gethclient" | ||
| "github.com/ethereum/go-ethereum/rpc" | ||
| ) | ||
|
|
||
| type Simulator struct { | ||
| c *rpc.Client | ||
| } | ||
|
|
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| func NewSimulator(c *rpc.Client) *Simulator { | ||
| return &Simulator{ | ||
| c: c, | ||
| } | ||
| } | ||
|
|
||
| func (s *Simulator) EstimateGasWithOverrides( | ||
| ctx context.Context, msg ethereum.CallMsg, blockNumber *big.Int, | ||
| overrides *map[common.Address]gethclient.OverrideAccount, | ||
| ) (uint64, error) { | ||
| var hex hexutil.Uint64 | ||
| err := s.c.CallContext( | ||
| ctx, &hex, "eth_estimateGas", toCallArg(msg), | ||
| toBlockNumArg(blockNumber), overrides, | ||
| ) | ||
|
|
||
| return uint64(hex), err | ||
| } | ||
|
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| func toCallArg(msg ethereum.CallMsg) interface{} { | ||
| arg := map[string]interface{}{ | ||
| "from": msg.From, | ||
| "to": msg.To, | ||
| } | ||
| if len(msg.Data) > 0 { | ||
| arg["input"] = hexutil.Bytes(msg.Data) | ||
| } | ||
| if msg.Value != nil { | ||
| arg["value"] = (*hexutil.Big)(msg.Value) | ||
| } | ||
| if msg.Gas != 0 { | ||
| arg["gas"] = hexutil.Uint64(msg.Gas) | ||
| } | ||
| if msg.GasPrice != nil { | ||
| arg["gasPrice"] = (*hexutil.Big)(msg.GasPrice) | ||
| } | ||
| return arg | ||
| } | ||
|
|
||
| func toBlockNumArg(number *big.Int) string { | ||
| if number == nil { | ||
| return "latest" | ||
| } | ||
| if number.Sign() >= 0 { | ||
| return hexutil.EncodeBig(number) | ||
| } | ||
| // It's negative. | ||
| if number.IsInt64() { | ||
| return rpc.BlockNumber(number.Int64()).String() | ||
| } | ||
| // It's negative and large, which is invalid. | ||
| return fmt.Sprintf("<invalid %d>", number) | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,43 @@ | ||
| package eth_test | ||
|
|
||
| import ( | ||
| "context" | ||
| "testing" | ||
|
|
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| "github.com/KyberNetwork/tradinglib/pkg/convert" | ||
| "github.com/KyberNetwork/tradinglib/pkg/eth" | ||
| "github.com/ethereum/go-ethereum" | ||
| "github.com/ethereum/go-ethereum/common" | ||
| "github.com/ethereum/go-ethereum/ethclient/gethclient" | ||
| "github.com/ethereum/go-ethereum/rpc" | ||
| "github.com/stretchr/testify/require" | ||
| ) | ||
|
|
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| func TestEstimateGasWithOverrides(t *testing.T) { | ||
| t.Skip() | ||
|
|
||
| var ( | ||
| url = "https://ethereum.kyberengineering.io" | ||
| wallet = common.HexToAddress("0x72CE0F4a9dbB974D3B1a9bF7ca857fD381260e97") | ||
| ethValue, _ = convert.FloatToWei(10, 18) | ||
| ) | ||
|
|
||
| c, err := rpc.Dial(url) | ||
| require.NoError(t, err) | ||
|
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| s := eth.NewSimulator(c) | ||
|
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| gasUnit, err := s.EstimateGasWithOverrides(context.Background(), ethereum.CallMsg{ | ||
| From: wallet, | ||
| To: &wallet, | ||
| Value: ethValue, | ||
| }, nil, &map[common.Address]gethclient.OverrideAccount{ | ||
| wallet: { | ||
| Code: []byte("0x6"), | ||
| Balance: ethValue, | ||
| }, | ||
| }, | ||
| ) | ||
| require.NoError(t, err) | ||
| t.Log(gasUnit) | ||
| } |