evm: move Keeper and Querier to /keeper package (#182)

* evm: move Keeper and Querier to /keeper package

* keeper: update keeper_test.go

* fix format

* evm: use aliased types

* add comments from review

* changelog

x/evm/types/genesis.go

@@ -0,0 +1,45 @@
+package types
+
+import (
+	"fmt"
+	"math/big"
+
+	"github.com/cosmos/ethermint/types"
+	ethcmn "github.com/ethereum/go-ethereum/common"
+)
+
+type (
+	// GenesisState defines the application's genesis state. It contains all the
+	// information required and accounts to initialize the blockchain.
+	GenesisState struct {
+		Accounts []GenesisAccount `json:"accounts"`
+	}
+
+	// GenesisAccount defines an account to be initialized in the genesis state.
+	GenesisAccount struct {
+		Address ethcmn.Address `json:"address"`
+		Balance *big.Int       `json:"balance"`
+		Code    []byte         `json:"code,omitempty"`
+		Storage types.Storage  `json:"storage,omitempty"`
+	}
+)
+
+// ValidateGenesis validates evm genesis config
+func ValidateGenesis(data GenesisState) error {
+	for _, acct := range data.Accounts {
+		if len(acct.Address.Bytes()) == 0 {
+			return fmt.Errorf("Invalid GenesisAccount Error: Missing Address")
+		}
+		if acct.Balance == nil {
+			return fmt.Errorf("Invalid GenesisAccount Error: Missing Balance")
+		}
+	}
+	return nil
+}
+
+// DefaultGenesisState sets default evm genesis config
+func DefaultGenesisState() GenesisState {
+	return GenesisState{
+		Accounts: []GenesisAccount{},
+	}
+}

x/evm/types/querier.go

@@ -6,6 +6,21 @@ import (
 	ethtypes "github.com/ethereum/go-ethereum/core/types"
 )
 
+// Supported endpoints
+const (
+	QueryProtocolVersion = "protocolVersion"
+	QueryBalance         = "balance"
+	QueryBlockNumber     = "blockNumber"
+	QueryStorage         = "storage"
+	QueryCode            = "code"
+	QueryNonce           = "nonce"
+	QueryHashToHeight    = "hashToHeight"
+	QueryTxLogs          = "txLogs"
+	QueryLogsBloom       = "logsBloom"
+	QueryLogs            = "logs"
+	QueryAccount         = "account"
+)
+
 // QueryResProtocolVersion is response type for protocol version query
 type QueryResProtocolVersion struct {
 	Version string `json:"version"`
@@ -79,7 +94,7 @@ func (q QueryBloomFilter) String() string {
 }
 
 // QueryAccount is response type for querying Ethereum state objects
-type QueryAccount struct {
+type QueryResAccount struct {
 	Balance  string `json:"balance"`
 	CodeHash []byte `json:"codeHash"`
 	Nonce    uint64 `json:"nonce"`