laconicd/x/evm/atlas/atlas-v0.3.1.md

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# x/evm
The `x/evm` module is responsible for executing Ethereum Virtual Machine (EVM) state transitions.
## Usage
1. Import the module and the dependency packages.
```go
import (
"github.com/cosmos/cosmos-sdk/x/auth"
"github.com/cosmos/cosmos-sdk/x/bank"
"github.com/tharsis/ethermint/app/ante"
ethermint "github.com/tharsis/ethermint/types"
"github.com/tharsis/ethermint/x/evm"
)
```
2. Add `AppModuleBasic` to your `ModuleBasics`.
```go
var (
ModuleBasics = module.NewBasicManager(
// ...
evm.AppModuleBasic{},
)
)
```
3. Create the module's parameter subspace in your application constructor.
```go
func NewApp(...) *App {
// ...
app.subspaces[evm.ModuleName] = app.ParamsKeeper.Subspace(evm.DefaultParamspace)
}
```
4. Define the Ethermint `ProtoAccount` for the `AccountKeeper`
```go
func NewApp(...) *App {
// ...
app.AccountKeeper = auth.NewAccountKeeper(
cdc, keys[auth.StoreKey], app.subspaces[auth.ModuleName], ethermint.ProtoAccount,
)
}
```
5. Create the keeper.
```go
func NewApp(...) *App {
// ...
app.EvmKeeper = evm.NewKeeper(
app.cdc, keys[evm.StoreKey], app.subspaces[evm.ModuleName], app.AccountKeeper,
)
}
```
6. Add the `x/evm` module to the app's `ModuleManager`.
```go
func NewApp(...) *App {
// ...
app.mm = module.NewManager(
// ...
evm.NewAppModule(app.EvmKeeper, app.AccountKeeper),
// ...
)
}
```
7. Set the `x/evm` module `BeginBlock` and `EndBlock` ordering:
```go
app.mm.SetOrderBeginBlockers(
evm.ModuleName, ...
)
app.mm.SetOrderEndBlockers(
evm.ModuleName, ...
)
```
8. Set the `x/evm` module genesis order. The module must go after the `auth` and `bank` modules.
```go
func NewApp(...) *App {
// ...
app.mm.SetOrderInitGenesis(auth.ModuleName, bank.ModuleName, ... , evm.ModuleName, ...)
}
```
9. Set the Ethermint `AnteHandler` to support EVM transactions. Note,
the default `AnteHandler` provided by the `x/evm` module depends on the `x/auth` and `x/supply`
modules.
```go
func NewApp(...) *App {
// ...
app.SetAnteHandler(ante.NewAnteHandler(
app.AccountKeeper, app.EvmKeeper, app.SupplyKeeper
))
}
```
## Genesis
The `x/evm` module defines its genesis state as follows:
```go
type GenesisState struct {
Accounts []GenesisAccount `json:"accounts"`
TxsLogs []TransactionLogs `json:"txs_logs"`
ChainConfig ChainConfig `json:"chain_config"`
Params Params `json:"params"`
}
```
Which relies on the following types:
```go
type GenesisAccount struct {
Address string `json:"address"`
Balance sdk.Int `json:"balance"`
Code hexutil.Bytes `json:"code,omitempty"`
Storage Storage `json:"storage,omitempty"`
}
type TransactionLogs struct {
Hash ethcmn.Hash `json:"hash"`
Logs []*ethtypes.Log `json:"logs"`
}
type ChainConfig struct {
HomesteadBlock sdk.Int `json:"homestead_block" yaml:"homestead_block"` // Homestead switch block (< 0 no fork, 0 = already homestead)
DAOForkBlock sdk.Int `json:"dao_fork_block" yaml:"dao_fork_block"` // TheDAO hard-fork switch block (< 0 no fork)
DAOForkSupport bool `json:"dao_fork_support" yaml:"dao_fork_support"` // Whether the nodes supports or opposes the DAO hard-fork
// EIP150 implements the Gas price changes (https://github.com/ethereum/EIPs/issues/150)
EIP150Block sdk.Int `json:"eip150_block" yaml:"eip150_block"` // EIP150 HF block (< 0 no fork)
EIP150Hash string `json:"eip150_hash" yaml:"eip150_hash"` // EIP150 HF hash (needed for header only clients as only gas pricing changed)
EIP155Block sdk.Int `json:"eip155_block" yaml:"eip155_block"` // EIP155 HF block
EIP158Block sdk.Int `json:"eip158_block" yaml:"eip158_block"` // EIP158 HF block
ByzantiumBlock sdk.Int `json:"byzantium_block" yaml:"byzantium_block"` // Byzantium switch block (< 0 no fork, 0 = already on byzantium)
ConstantinopleBlock sdk.Int `json:"constantinople_block" yaml:"constantinople_block"` // Constantinople switch block (< 0 no fork, 0 = already activated)
PetersburgBlock sdk.Int `json:"petersburg_block" yaml:"petersburg_block"` // Petersburg switch block (< 0 same as Constantinople)
IstanbulBlock sdk.Int `json:"istanbul_block" yaml:"istanbul_block"` // Istanbul switch block (< 0 no fork, 0 = already on istanbul)
MuirGlacierBlock sdk.Int `json:"muir_glacier_block" yaml:"muir_glacier_block"` // Eip-2384 (bomb delay) switch block (< 0 no fork, 0 = already activated)
YoloV2Block sdk.Int `json:"yoloV2_block" yaml:"yoloV2_block"` // YOLO v1: https://github.com/ethereum/EIPs/pull/2657 (Ephemeral testnet)
EWASMBlock sdk.Int `json:"ewasm_block" yaml:"ewasm_block"` // EWASM switch block (< 0 no fork, 0 = already activated)
}
type Params struct {
// EVMDenom defines the token denomination used for state transitions on the
// EVM module.
EvmDenom string `json:"evm_denom" yaml:"evm_denom"`
// EnableCreate toggles state transitions that use the vm.Create function
EnableCreate bool `json:"enable_create" yaml:"enable_create"`
// EnableCall toggles state transitions that use the vm.Call function
EnableCall bool `json:"enable_call" yaml:"enable_call"`
// ExtraEIPs defines the additional EIPs for the vm.Config
ExtraEIPs []int `json:"extra_eips" yaml:"extra_eips"`
}
```
## Client
### JSON-RPC
See the Ethermint [JSON-RPC docs](https://docs.ethermint.zone/basics/json_rpc.html) for reference.
## Documentation and Specification
* Ethermint documentation: [https://docs.ethermint.zone](https://docs.ethermint.zone)