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les: implement ultralight client (#16904)

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For more information about this light client mode, read
https://hackmd.io/s/HJy7jjZpm
This commit is contained in:
b00ris
2019-01-24 14:18:26 +03:00
committed by Felix Lange
parent b8f9b3779f
commit 769657060e
23 changed files with 1288 additions and 179 deletions
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55
cmd/utils/flags.go
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@ -19,6 +19,7 @@ package utils
import (
"crypto/ecdsa"
"encoding/json"
"fmt"
"io/ioutil"
"math/big"
@ -161,6 +162,23 @@ var (
Usage: "Document Root for HTTPClient file scheme",
Value: DirectoryString{homeDir()},
}
ULCModeConfigFlag = cli.StringFlag{
Name: "ulc.config",
Usage: "Config file to use for ultra light client mode",
}
OnlyAnnounceModeFlag = cli.BoolFlag{
Name: "ulc.onlyannounce",
Usage: "ULC server sends announcements only",
}
ULCMinTrustedFractionFlag = cli.IntFlag{
Name: "ulc.fraction",
Usage: "Minimum % of trusted ULC servers required to announce a new head",
}
ULCTrustedNodesFlag = cli.StringFlag{
Name: "ulc.trusted",
Usage: "List of trusted ULC servers",
}
defaultSyncMode = eth.DefaultConfig.SyncMode
SyncModeFlag = TextMarshalerFlag{
Name: "syncmode",
@ -871,6 +889,40 @@ func setIPC(ctx *cli.Context, cfg *node.Config) {
}
}
// SetULC setup ULC config from file if given.
func SetULC(ctx *cli.Context, cfg *eth.Config) {
// ULC config isn't loaded from global config and ULC config and ULC trusted nodes are not defined.
if cfg.ULC == nil && !(ctx.GlobalIsSet(ULCModeConfigFlag.Name) || ctx.GlobalIsSet(ULCTrustedNodesFlag.Name)) {
return
}
cfg.ULC = &eth.ULCConfig{}
path := ctx.GlobalString(ULCModeConfigFlag.Name)
if path != "" {
cfgData, err := ioutil.ReadFile(path)
if err != nil {
Fatalf("Failed to unmarshal ULC configuration: %v", err)
}
err = json.Unmarshal(cfgData, &cfg.ULC)
if err != nil {
Fatalf("Failed to unmarshal ULC configuration: %s", err.Error())
}
}
if trustedNodes := ctx.GlobalString(ULCTrustedNodesFlag.Name); trustedNodes != "" {
cfg.ULC.TrustedServers = strings.Split(trustedNodes, ",")
}
if trustedFraction := ctx.GlobalInt(ULCMinTrustedFractionFlag.Name); trustedFraction > 0 {
cfg.ULC.MinTrustedFraction = trustedFraction
}
if cfg.ULC.MinTrustedFraction <= 0 && cfg.ULC.MinTrustedFraction > 100 {
log.Error("MinTrustedFraction is invalid", "MinTrustedFraction", cfg.ULC.MinTrustedFraction, "Changed to default", eth.DefaultULCMinTrustedFraction)
cfg.ULC.MinTrustedFraction = eth.DefaultULCMinTrustedFraction
}
}
// makeDatabaseHandles raises out the number of allowed file handles per process
// for Geth and returns half of the allowance to assign to the database.
func makeDatabaseHandles() int {
@ -1222,6 +1274,9 @@ func SetEthConfig(ctx *cli.Context, stack *node.Node, cfg *eth.Config) {
if ctx.GlobalIsSet(LightPeersFlag.Name) {
cfg.LightPeers = ctx.GlobalInt(LightPeersFlag.Name)
}
if ctx.GlobalIsSet(OnlyAnnounceModeFlag.Name) {
cfg.OnlyAnnounce = ctx.GlobalBool(OnlyAnnounceModeFlag.Name)
}
if ctx.GlobalIsSet(NetworkIdFlag.Name) {
cfg.NetworkId = ctx.GlobalUint64(NetworkIdFlag.Name)
}