cmd/geth: add --config file flag (#13875)

* p2p/discover, p2p/discv5: add marshaling methods to Node

* p2p/netutil: make Netlist decodable from TOML

* common/math: encode nil HexOrDecimal256 as 0x0

* cmd/geth: add --config file flag

* cmd/geth: add missing license header

* eth: prettify Config again, fix tests

* eth: use gasprice.Config instead of duplicating its fields

* eth/gasprice: hide nil default from dumpconfig output

* cmd/geth: hide genesis block in dumpconfig output

* node: make tests compile

* console: fix tests

* cmd/geth: make TOML keys look exactly like Go struct fields

* p2p: use discovery by default

This makes the zero Config slightly more useful. It also fixes package
node tests because Node detects reuse of the datadir through the
NodeDatabase.

* cmd/geth: make ethstats URL settable through config file

* cmd/faucet: fix configuration

* cmd/geth: dedup attach tests

* eth: add comment for DefaultConfig

* eth: pass downloader.SyncMode in Config

This removes the FastSync, LightSync flags in favour of a more
general SyncMode flag.

* cmd/utils: remove jitvm flags

* cmd/utils: make mutually exclusive flag error prettier

It now reads:

   Fatal: flags --dev, --testnet can't be used at the same time

* p2p: fix typo

* node: add DefaultConfig, use it for geth

* mobile: add missing NoDiscovery option

* cmd/utils: drop MakeNode

This exposed a couple of places that needed to be updated to use
node.DefaultConfig.

* node: fix typo

* eth: make fast sync the default mode

* cmd/utils: remove IPCApiFlag (unused)

* node: remove default IPC path

Set it in the frontends instead.

* cmd/geth: add --syncmode

* cmd/utils: make --ipcdisable and --ipcpath mutually exclusive

* cmd/utils: don't enable WS, HTTP when setting addr

* cmd/utils: fix --identity

cmd/geth/main.go

@@ -18,7 +18,6 @@
 package main
 
 import (
-	"encoding/hex"
 	"fmt"
 	"os"
 	"runtime"
@@ -29,17 +28,13 @@ import (
 	"github.com/ethereum/go-ethereum/accounts/keystore"
 	"github.com/ethereum/go-ethereum/cmd/utils"
 	"github.com/ethereum/go-ethereum/common"
-	"github.com/ethereum/go-ethereum/common/hexutil"
 	"github.com/ethereum/go-ethereum/console"
-	"github.com/ethereum/go-ethereum/contracts/release"
 	"github.com/ethereum/go-ethereum/eth"
 	"github.com/ethereum/go-ethereum/ethclient"
 	"github.com/ethereum/go-ethereum/internal/debug"
 	"github.com/ethereum/go-ethereum/log"
 	"github.com/ethereum/go-ethereum/metrics"
 	"github.com/ethereum/go-ethereum/node"
-	"github.com/ethereum/go-ethereum/params"
-	"github.com/ethereum/go-ethereum/rlp"
 	"gopkg.in/urfave/cli.v1"
 )
 
@@ -82,6 +77,8 @@ func init() {
 		versionCommand,
 		bugCommand,
 		licenseCommand,
+		// See config.go
+		dumpConfigCommand,
 	}
 
 	app.Flags = []cli.Flag{
@@ -99,6 +96,7 @@ func init() {
 		utils.EthashDatasetsOnDiskFlag,
 		utils.FastSyncFlag,
 		utils.LightModeFlag,
+		utils.SyncModeFlag,
 		utils.LightServFlag,
 		utils.LightPeersFlag,
 		utils.LightKDFFlag,
@@ -129,16 +127,12 @@ func init() {
 		utils.WSApiFlag,
 		utils.WSAllowedOriginsFlag,
 		utils.IPCDisabledFlag,
-		utils.IPCApiFlag,
 		utils.IPCPathFlag,
 		utils.ExecFlag,
 		utils.PreloadJSFlag,
 		utils.WhisperEnabledFlag,
 		utils.DevModeFlag,
 		utils.TestNetFlag,
-		utils.VMForceJitFlag,
-		utils.VMJitCacheFlag,
-		utils.VMEnableJitFlag,
 		utils.VMEnableDebugFlag,
 		utils.NetworkIdFlag,
 		utils.RPCCORSDomainFlag,
@@ -150,6 +144,7 @@ func init() {
 		utils.GpoBlocksFlag,
 		utils.GpoPercentileFlag,
 		utils.ExtraDataFlag,
+		configFileFlag,
 	}
 	app.Flags = append(app.Flags, debug.Flags...)
 
@@ -189,52 +184,6 @@ func geth(ctx *cli.Context) error {
 	return nil
 }
 
-func makeFullNode(ctx *cli.Context) *node.Node {
-	// Create the default extradata and construct the base node
-	var clientInfo = struct {
-		Version   uint
-		Name      string
-		GoVersion string
-		Os        string
-	}{uint(params.VersionMajor<<16 | params.VersionMinor<<8 | params.VersionPatch), clientIdentifier, runtime.Version(), runtime.GOOS}
-	extra, err := rlp.EncodeToBytes(clientInfo)
-	if err != nil {
-		log.Warn("Failed to set canonical miner information", "err", err)
-	}
-	if uint64(len(extra)) > params.MaximumExtraDataSize {
-		log.Warn("Miner extra data exceed limit", "extra", hexutil.Bytes(extra), "limit", params.MaximumExtraDataSize)
-		extra = nil
-	}
-	stack := utils.MakeNode(ctx, clientIdentifier, gitCommit)
-	utils.RegisterEthService(ctx, stack, extra)
-
-	// Whisper must be explicitly enabled, but is auto-enabled in --dev mode.
-	shhEnabled := ctx.GlobalBool(utils.WhisperEnabledFlag.Name)
-	shhAutoEnabled := !ctx.GlobalIsSet(utils.WhisperEnabledFlag.Name) && ctx.GlobalIsSet(utils.DevModeFlag.Name)
-	if shhEnabled || shhAutoEnabled {
-		utils.RegisterShhService(stack)
-	}
-	// Add the Ethereum Stats daemon if requested
-	if url := ctx.GlobalString(utils.EthStatsURLFlag.Name); url != "" {
-		utils.RegisterEthStatsService(stack, url)
-	}
-	// Add the release oracle service so it boots along with node.
-	if err := stack.Register(func(ctx *node.ServiceContext) (node.Service, error) {
-		config := release.Config{
-			Oracle: relOracle,
-			Major:  uint32(params.VersionMajor),
-			Minor:  uint32(params.VersionMinor),
-			Patch:  uint32(params.VersionPatch),
-		}
-		commit, _ := hex.DecodeString(gitCommit)
-		copy(config.Commit[:], commit)
-		return release.NewReleaseService(ctx, config)
-	}); err != nil {
-		utils.Fatalf("Failed to register the Geth release oracle service: %v", err)
-	}
-	return stack
-}
-
 // startNode boots up the system node and all registered protocols, after which
 // it unlocks any requested accounts, and starts the RPC/IPC interfaces and the
 // miner.