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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,170 @@ | ||
| package keeper | ||
|
|
||
| import ( | ||
| "context" | ||
| "fmt" | ||
| "math/big" | ||
|
|
||
| cryptotypes "github.com/cosmos/cosmos-sdk/crypto/types" | ||
| sdk "github.com/cosmos/cosmos-sdk/types" | ||
| "github.com/ethereum/go-ethereum/accounts/abi" | ||
| "github.com/ethereum/go-ethereum/common" | ||
| "github.com/ethereum/go-ethereum/core" | ||
| "github.com/ethereum/go-ethereum/core/vm" | ||
| "github.com/ethereum/go-ethereum/crypto" | ||
|
|
||
| "mods.irisnet.org/modules/token/contracts" | ||
| tokentypes "mods.irisnet.org/modules/token/types" | ||
| ) | ||
|
|
||
|
|
||
| var ( | ||
| _ tokentypes.EVMKeeper = (*mockEVM)(nil) | ||
| _ tokentypes.ICS20Keeper = (*mockICS20)(nil) | ||
| ) | ||
|
|
||
|
|
||
| // ProvideMockEVM returns an instance of tokentypes.EVMKeeper. | ||
| // | ||
| // No parameters. | ||
| // Returns a tokentypes.EVMKeeper. | ||
| func ProvideMockEVM() tokentypes.EVMKeeper { | ||
| return &mockEVM{ | ||
| erc20s: make(map[common.Address]*erc20), | ||
| } | ||
| } | ||
|
|
||
| // ProvideMockICS20 returns an instance of tokentypes.ICS20Keeper. | ||
| // | ||
| // No parameters. | ||
| // Returns a tokentypes.ICS20Keeper. | ||
| func ProvideMockICS20() tokentypes.ICS20Keeper { | ||
| return &mockICS20{} | ||
| } | ||
|
|
||
| type mockEVM struct { | ||
| erc20s map[common.Address]*erc20 | ||
| } | ||
|
|
||
| // ApplyMessage implements types.EVMKeeper. | ||
| func (e *mockEVM) ApplyMessage(ctx sdk.Context, msg core.Message, tracer vm.EVMLogger, commit bool) (*tokentypes.Result, error) { | ||
| isCreate := msg.To() == nil | ||
| if isCreate { | ||
| contractAddr := crypto.CreateAddress(msg.From(), msg.Nonce()) | ||
|
|
||
| data := msg.Data()[len(contracts.TokenProxyContract.Bin):] | ||
| args, err := contracts.TokenProxyContract.ABI.Constructor.Inputs.Unpack(data) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| data = args[1].([]byte) | ||
| data = data[4:] | ||
| args, err = contracts.ERC20TokenContract.ABI.Methods[contracts.MethodInitialize].Inputs.Unpack(data) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| name, _ := args[0].(string) | ||
| symbol, _ := args[1].(string) | ||
| scale, _ := args[2].(uint8) | ||
| e.erc20s[contractAddr] = &erc20{ | ||
| address: contractAddr, | ||
| scale: scale, | ||
| name: name, | ||
| symbol: symbol, | ||
| balance: make(map[common.Address]*big.Int), | ||
| } | ||
| return &tokentypes.Result{ | ||
| Hash: contractAddr.Hex(), | ||
| }, nil | ||
| } | ||
|
|
||
| erc20Contract, ok := e.erc20s[*msg.To()] | ||
| if !ok { | ||
| return nil, fmt.Errorf("erc20 contract not found") | ||
| } | ||
| return e.dispatch(erc20Contract, msg.Data()) | ||
| } | ||
|
|
||
| // ChainID implements types.EVMKeeper. | ||
| func (e *mockEVM) ChainID() *big.Int { | ||
| return big.NewInt(16688) | ||
| } | ||
|
|
||
| // EstimateGas implements types.EVMKeeper. | ||
| func (e *mockEVM) EstimateGas(ctx context.Context, req *tokentypes.EthCallRequest) (uint64, error) { | ||
| return 3000000, nil | ||
| } | ||
|
|
||
| // SupportedKey implements types.EVMKeeper. | ||
| func (e *mockEVM) SupportedKey(pubKey cryptotypes.PubKey) bool { | ||
| return true | ||
| } | ||
|
|
||
| func (e *mockEVM) dispatch(contract *erc20, data []byte) (*tokentypes.Result, error) { | ||
| method, err := contracts.ERC20TokenContract.ABI.MethodById(data[0:4]) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| ret, err := contract.call(method, data[4:]) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| return &tokentypes.Result{ | ||
| Hash: contract.address.Hex(), | ||
| Ret: ret, | ||
| }, nil | ||
| } | ||
|
|
||
| type erc20 struct { | ||
| address common.Address | ||
| scale uint8 | ||
| name, symbol string | ||
|
|
||
| balance map[common.Address]*big.Int | ||
| } | ||
|
|
||
| func (erc20 erc20) call(method *abi.Method, data []byte) ([]byte, error) { | ||
| args, err := method.Inputs.Unpack(data) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| switch method.Name { | ||
| case "name": | ||
| return method.Outputs.Pack(erc20.name) | ||
| case "symbol": | ||
| return method.Outputs.Pack(erc20.symbol) | ||
| case "decimals": | ||
| return method.Outputs.Pack(erc20.scale) | ||
| case "balanceOf": | ||
| balance, ok := erc20.balance[args[0].(common.Address)] | ||
| if !ok { | ||
| return method.Outputs.Pack(big.NewInt(0)) | ||
| } | ||
| return method.Outputs.Pack(balance) | ||
| case "mint": | ||
| to := args[0].(common.Address) | ||
| balance, ok := erc20.balance[args[0].(common.Address)] | ||
| if !ok { | ||
| balance = big.NewInt(0) | ||
| } | ||
| erc20.balance[to] = new(big.Int).Add(balance, args[1].(*big.Int)) | ||
| return nil, nil | ||
| case "burn": | ||
| from := args[0].(common.Address) | ||
| erc20.balance[from] = new(big.Int).Sub(erc20.balance[from], args[1].(*big.Int)) | ||
| return nil, nil | ||
| default: | ||
| return nil, fmt.Errorf("unknown method %s", method.Name) | ||
| } | ||
| } | ||
|
|
||
| type mockICS20 struct{} | ||
|
|
||
| // HasTrace implements types.ICS20Keeper. | ||
| func (t *mockICS20) HasTrace(ctx sdk.Context, denom string) bool { | ||
| return true | ||
| } |