// Copyright 2017 The go-ethereum Authors
// This file is part of go-ethereum.
//
// go-ethereum is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// go-ethereum is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with go-ethereum. If not, see <http://www.gnu.org/licenses/>.
package main
import (
"errors"
"fmt"
"io"
"os"
"reflect"
"strconv"
"strings"
"time"
"unicode"
cli "gopkg.in/urfave/cli.v1"
"github.com/ethereum/go-ethereum/cmd/utils"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/log"
"github.com/ethereum/go-ethereum/node"
"github.com/naoina/toml"
bzzapi "github.com/ethereum/go-ethereum/swarm/api"
)
const SWARM_VERSION = "0.3"
var (
//flag definition for the dumpconfig command
DumpConfigCommand = cli.Command{
Action: utils.MigrateFlags(dumpConfig),
Name: "dumpconfig",
Usage: "Show configuration values",
ArgsUsage: "",
Flags: app.Flags,
Category: "MISCELLANEOUS COMMANDS",
Description: `The dumpconfig command shows configuration values.`,
}
//flag definition for the config file command
SwarmTomlConfigPathFlag = cli.StringFlag{
Name: "config",
Usage: "TOML configuration file",
}
)
//constants for environment variables
const (
SWARM_ENV_CHEQUEBOOK_ADDR = "SWARM_CHEQUEBOOK_ADDR"
SWARM_ENV_ACCOUNT = "SWARM_ACCOUNT"
SWARM_ENV_LISTEN_ADDR = "SWARM_LISTEN_ADDR"
SWARM_ENV_PORT = "SWARM_PORT"
SWARM_ENV_NETWORK_ID = "SWARM_NETWORK_ID"
SWARM_ENV_SWAP_ENABLE = "SWARM_SWAP_ENABLE"
SWARM_ENV_SWAP_API = "SWARM_SWAP_API"
SWARM_ENV_SYNC_DISABLE = "SWARM_SYNC_DISABLE"
SWARM_ENV_SYNC_UPDATE_DELAY = "SWARM_ENV_SYNC_UPDATE_DELAY"
SWARM_ENV_DELIVERY_SKIP_CHECK = "SWARM_DELIVERY_SKIP_CHECK"
SWARM_ENV_ENS_API = "SWARM_ENS_API"
SWARM_ENV_ENS_ADDR = "SWARM_ENS_ADDR"
SWARM_ENV_CORS = "SWARM_CORS"
SWARM_ENV_BOOTNODES = "SWARM_BOOTNODES"
SWARM_ENV_PSS_ENABLE = "SWARM_PSS_ENABLE"
SWARM_ENV_STORE_PATH = "SWARM_STORE_PATH"
SWARM_ENV_STORE_CAPACITY = "SWARM_STORE_CAPACITY"
SWARM_ENV_STORE_CACHE_CAPACITY = "SWARM_STORE_CACHE_CAPACITY"
GETH_ENV_DATADIR = "GETH_DATADIR"
)
// These settings ensure that TOML keys use the same names as Go struct fields.
var tomlSettings = toml.Config{
NormFieldName: func(rt reflect.Type, key string) string {
return key
},
FieldToKey: func(rt reflect.Type, field string) string {
return field
},
MissingField: func(rt reflect.Type, field string) error {
link := ""
if unicode.IsUpper(rune(rt.Name()[0])) && rt.PkgPath() != "main" {
link = fmt.Sprintf(", check github.com/ethereum/go-ethereum/swarm/api/config.go for available fields")
}
return fmt.Errorf("field '%s' is not defined in %s%s", field, rt.String(), link)
},
}
//before booting the swarm node, build the configuration
func buildConfig(ctx *cli.Context) (config *bzzapi.Config, err error) {
//start by creating a default config
config = bzzapi.NewConfig()
//first load settings from config file (if provided)
config, err = configFileOverride(config, ctx)
if err != nil {
return nil, err
}
//override settings provided by environment variables
config = envVarsOverride(config)
//override settings provided by command line
config = cmdLineOverride(config, ctx)
//validate configuration parameters
err = validateConfig(config)
return
}
//finally, after the configuration build phase is finished, initialize
func initSwarmNode(config *bzzapi.Config, stack *node.Node, ctx *cli.Context) {
//at this point, all vars should be set in the Config
//get the account for the provided swarm account
prvkey := getAccount(config.BzzAccount, ctx, stack)
//set the resolved config path (geth --datadir)
config.Path = stack.InstanceDir()
//finally, initialize the configuration
config.Init(prvkey)
//configuration phase completed here
log.Debug("Starting Swarm with the following parameters:")
//after having created the config, print it to screen
log.Debug(printConfig(config))
}
//override the current config with whatever is in the config file, if a config file has been provided
func configFileOverride(config *bzzapi.Config, ctx *cli.Context) (*bzzapi.Config, error) {
var err error
//only do something if the -config flag has been set
if ctx.GlobalIsSet(SwarmTomlConfigPathFlag.Name) {
var filepath string
if filepath = ctx.GlobalString(SwarmTomlConfigPathFlag.Name); filepath == "" {
utils.Fatalf("Config file flag provided with invalid file path")
}
f, err := os.Open(filepath)
if err != nil {
return nil, err
}
defer f.Close()
//decode the TOML file into a Config struct
//note that we are decoding into the existing defaultConfig;
//if an entry is not present in the file, the default entry is kept
err = tomlSettings.NewDecoder(f).Decode(&config)
// Add file name to errors that have a line number.
if _, ok := err.(*toml.LineError); ok {
err = errors.New(filepath + ", " + err.Error())
}
}
return config, err
}
//override the current config with whatever is provided through the command line
//most values are not allowed a zero value (empty string), if not otherwise noted
func cmdLineOverride(currentConfig *bzzapi.Config, ctx *cli.Context) *bzzapi.Config {
if keyid := ctx.GlobalString(SwarmAccountFlag.Name); keyid != "" {
currentConfig.BzzAccount = keyid
}
if chbookaddr := ctx.GlobalString(ChequebookAddrFlag.Name); chbookaddr != "" {
currentConfig.Contract = common.HexToAddress(chbookaddr)
}
if networkid := ctx.GlobalString(SwarmNetworkIdFlag.Name); networkid != "" {
if id, _ := strconv.Atoi(networkid); id != 0 {
currentConfig.NetworkID = uint64(id)
}
}
if ctx.GlobalIsSet(utils.DataDirFlag.Name) {
if datadir := ctx.GlobalString(utils.DataDirFlag.Name); datadir != "" {
currentConfig.Path = datadir
}
}
bzzport := ctx.GlobalString(SwarmPortFlag.Name)
if len(bzzport) > 0 {
currentConfig.Port = bzzport
}
if bzzaddr := ctx.GlobalString(SwarmListenAddrFlag.Name); bzzaddr != "" {
currentConfig.ListenAddr = bzzaddr
}
if ctx.GlobalIsSet(SwarmSwapEnabledFlag.Name) {
currentConfig.SwapEnabled = true
}
if ctx.GlobalIsSet(SwarmSyncDisabledFlag.Name) {
currentConfig.SyncEnabled = false
}
if d := ctx.GlobalDuration(SwarmSyncUpdateDelay.Name); d > 0 {
currentConfig.SyncUpdateDelay = d
}
if ctx.GlobalIsSet(SwarmDeliverySkipCheckFlag.Name) {
currentConfig.DeliverySkipCheck = true
}
currentConfig.SwapAPI = ctx.GlobalString(SwarmSwapAPIFlag.Name)
if currentConfig.SwapEnabled && currentConfig.SwapAPI == "" {
utils.Fatalf(SWARM_ERR_SWAP_SET_NO_API)
}
if ctx.GlobalIsSet(EnsAPIFlag.Name) {
ensAPIs := ctx.GlobalStringSlice(EnsAPIFlag.Name)
// preserve backward compatibility to disable ENS with --ens-api=""
if len(ensAPIs) == 1 && ensAPIs[0] == "" {
ensAPIs = nil
}
currentConfig.EnsAPIs = ensAPIs
}
if cors := ctx.GlobalString(CorsStringFlag.Name); cors != "" {
currentConfig.Cors = cors
}
if ctx.GlobalIsSet(utils.BootnodesFlag.Name) {
currentConfig.BootNodes = ctx.GlobalString(utils.BootnodesFlag.Name)
}
if storePath := ctx.GlobalString(SwarmStorePath.Name); storePath != "" {
currentConfig.LocalStoreParams.ChunkDbPath = storePath
}
if storeCapacity := ctx.GlobalUint64(SwarmStoreCapacity.Name); storeCapacity != 0 {
currentConfig.LocalStoreParams.DbCapacity = storeCapacity
}
if storeCacheCapacity := ctx.GlobalUint(SwarmStoreCacheCapacity.Name); storeCacheCapacity != 0 {
currentConfig.LocalStoreParams.CacheCapacity = storeCacheCapacity
}
return currentConfig
}
//override the current config with whatver is provided in environment variables
//most values are not allowed a zero value (empty string), if not otherwise noted
func envVarsOverride(currentConfig *bzzapi.Config) (config *bzzapi.Config) {
if keyid := os.Getenv(SWARM_ENV_ACCOUNT); keyid != "" {
currentConfig.BzzAccount = keyid
}
if chbookaddr := os.Getenv(SWARM_ENV_CHEQUEBOOK_ADDR); chbookaddr != "" {
currentConfig.Contract = common.HexToAddress(chbookaddr)
}
if networkid := os.Getenv(SWARM_ENV_NETWORK_ID); networkid != "" {
if id, _ := strconv.Atoi(networkid); id != 0 {
currentConfig.NetworkID = uint64(id)
}
}
if datadir := os.Getenv(GETH_ENV_DATADIR); datadir != "" {
currentConfig.Path = datadir
}
bzzport := os.Getenv(SWARM_ENV_PORT)
if len(bzzport) > 0 {
currentConfig.Port = bzzport
}
if bzzaddr := os.Getenv(SWARM_ENV_LISTEN_ADDR); bzzaddr != "" {
currentConfig.ListenAddr = bzzaddr
}
if swapenable := os.Getenv(SWARM_ENV_SWAP_ENABLE); swapenable != "" {
if swap, err := strconv.ParseBool(swapenable); err != nil {
currentConfig.SwapEnabled = swap
}
}
if syncdisable := os.Getenv(SWARM_ENV_SYNC_DISABLE); syncdisable != "" {
if sync, err := strconv.ParseBool(syncdisable); err != nil {
currentConfig.SyncEnabled = !sync
}
}
if v := os.Getenv(SWARM_ENV_DELIVERY_SKIP_CHECK); v != "" {
if skipCheck, err := strconv.ParseBool(v); err != nil {
currentConfig.DeliverySkipCheck = skipCheck
}
}
if v := os.Getenv(SWARM_ENV_SYNC_UPDATE_DELAY); v != "" {
if d, err := time.ParseDuration(v); err != nil {
currentConfig.SyncUpdateDelay = d
}
}
if swapapi := os.Getenv(SWARM_ENV_SWAP_API); swapapi != "" {
currentConfig.SwapAPI = swapapi
}
if currentConfig.SwapEnabled && currentConfig.SwapAPI == "" {
utils.Fatalf(SWARM_ERR_SWAP_SET_NO_API)
}
if ensapi := os.Getenv(SWARM_ENV_ENS_API); ensapi != "" {
currentConfig.EnsAPIs = strings.Split(ensapi, ",")
}
if ensaddr := os.Getenv(SWARM_ENV_ENS_ADDR); ensaddr != "" {
currentConfig.EnsRoot = common.HexToAddress(ensaddr)
}
if cors := os.Getenv(SWARM_ENV_CORS); cors != "" {
currentConfig.Cors = cors
}
if bootnodes := os.Getenv(SWARM_ENV_BOOTNODES); bootnodes != "" {
currentConfig.BootNodes = bootnodes
}
return currentConfig
}
// dumpConfig is the dumpconfig command.
// writes a default config to STDOUT
func dumpConfig(ctx *cli.Context) error {
cfg, err := buildConfig(ctx)
if err != nil {
utils.Fatalf(fmt.Sprintf("Uh oh - dumpconfig triggered an error %v", err))
}
comment := ""
out, err := tomlSettings.Marshal(&cfg)
if err != nil {
return err
}
io.WriteString(os.Stdout, comment)
os.Stdout.Write(out)
return nil
}
//validate configuration parameters
func validateConfig(cfg *bzzapi.Config) (err error) {
for _, ensAPI := range cfg.EnsAPIs {
if ensAPI != "" {
if err := validateEnsAPIs(ensAPI); err != nil {
return fmt.Errorf("invalid format [tld:][contract-addr@]url for ENS API endpoint configuration %q: %v", ensAPI, err)
}
}
}
return nil
}
//validate EnsAPIs configuration parameter
func validateEnsAPIs(s string) (err error) {
// missing contract address
if strings.HasPrefix(s, "@") {
return errors.New("missing contract address")
}
// missing url
if strings.HasSuffix(s, "@") {
return errors.New("missing url")
}
// missing tld
if strings.HasPrefix(s, ":") {
return errors.New("missing tld")
}
// missing url
if strings.HasSuffix(s, ":") {
return errors.New("missing url")
}
return nil
}
//print a Config as string
func printConfig(config *bzzapi.Config) string {
out, err := tomlSettings.Marshal(&config)
if err != nil {
return fmt.Sprintf("Something is not right with the configuration: %v", err)
}
return string(out)
}
