Priom/gorli cli flag (#17)

* go modules added; preparing to write aura consensus

* adding goerli flag

* goerli flag added

* adding configs

* core/vm: Hide read only flag from Interpreter interface (ethereum#17461) (#6)

Makes Interface interface a bit more stateless and abstract.

Obviously this change is dictated by EVMC design. The EVMC tries to keep the responsibility for EVM features totally inside the VMs, if feasible. This makes VM "stateless" because VM does not need to pass any information between executions, all information is included in parameters of the execute function.

* configuring genesis

* removing duplicate imports

* adding configs for aura api

* configuring goerli cli flag

* flag function fix

* typo fix

cmd/geth/chaincmd.go

@@ -136,6 +136,7 @@ The export-preimages command export hash preimages to an RLP encoded stream`,
 			utils.FakePoWFlag,
 			utils.TestnetFlag,
 			utils.RinkebyFlag,
+			utils.GoerliFlag,
 		},
 		Category: "BLOCKCHAIN COMMANDS",
 		Description: `

cmd/geth/usage.go

@@ -74,6 +74,7 @@ var AppHelpFlagGroups = []flagGroup{
 			utils.NetworkIdFlag,
 			utils.TestnetFlag,
 			utils.RinkebyFlag,
+			utils.GoerliFlag,
 			utils.SyncModeFlag,
 			utils.GCModeFlag,
 			utils.EthStatsURLFlag,

cmd/utils/flags.go

@@ -34,6 +34,7 @@ import (
 	"github.com/ethereum/go-ethereum/common/fdlimit"
 	"github.com/ethereum/go-ethereum/consensus"
 	"github.com/ethereum/go-ethereum/consensus/clique"
+	"github.com/ethereum/go-ethereum/consensus/aura"
 	"github.com/ethereum/go-ethereum/consensus/ethash"
 	"github.com/ethereum/go-ethereum/core"
 	"github.com/ethereum/go-ethereum/core/state"
@@ -144,7 +145,7 @@ var (
 		Name:  "dev",
 		Usage: "Ephemeral proof-of-authority network with a pre-funded developer account, mining enabled",
 	}
-	GoerliFLag = cli.BoolFlag{
+	GoerliFlag = cli.BoolFlag{
 		Name: "goerli",
 		Usage: "Goerli network: pre-configured proof-of-authority test network",
 	}
@@ -684,7 +685,7 @@ func setBootstrapNodes(ctx *cli.Context, cfg *p2p.Config) {
 		urls = params.TestnetBootnodes
 	case ctx.GlobalBool(RinkebyFlag.Name):
 		urls = params.RinkebyBootnodes
-	case ctx.GlobalBool(GoerliFLag.Name):
+	case ctx.GlobalBool(GoerliFlag.Name):
 		urls = params.GoerliBootnodes
 	case cfg.BootstrapNodes != nil:
 		return // already set, don't apply defaults.
@@ -1350,7 +1351,7 @@ func MakeGenesis(ctx *cli.Context) *core.Genesis {
 		genesis = core.DefaultRinkebyGenesisBlock()
 	case ctx.GlobalBool(DeveloperFlag.Name):
 		Fatalf("Developer chains are ephemeral")
-	case ctx.GlobalBool(GoerliFLag.Name):
+	case ctx.GlobalBool(GoerliFlag.Name):
 		genesis = core.DefaultGoerliGenesisBlock()
 	}
 	return genesis
@@ -1368,6 +1369,8 @@ func MakeChain(ctx *cli.Context, stack *node.Node) (chain *core.BlockChain, chai
 	var engine consensus.Engine
 	if config.Clique != nil {
 		engine = clique.New(config.Clique, chainDb)
+	} else if config.Aura != nil {
+		engine = aura.New(config.Aura, chainDb)
 	} else {
 		engine = ethash.NewFaker()
 		if !ctx.GlobalBool(FakePoWFlag.Name) {