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