From 769657060e888612e7d585c6b6eae16a64c4ad19 Mon Sep 17 00:00:00 2001
From: b00ris <b00ris@mail.ru>
Date: Thu, 24 Jan 2019 14:18:26 +0300
Subject: les: implement ultralight client (#16904)

For more information about this light client mode, read
https://hackmd.io/s/HJy7jjZpm
---
 eth/config.go     |  8 ++++++--
 eth/gen_config.go | 29 +++++++++++++++++++++--------
 eth/ulc_config.go |  9 +++++++++
 3 files changed, 36 insertions(+), 10 deletions(-)
 create mode 100644 eth/ulc_config.go

(limited to 'eth')

diff --git a/eth/config.go b/eth/config.go
index 7c041d1af..f71b8dfee 100644
--- a/eth/config.go
+++ b/eth/config.go
@@ -91,8 +91,12 @@ type Config struct {
 	Whitelist map[uint64]common.Hash `toml:"-"`
 
 	// Light client options
-	LightServ  int `toml:",omitempty"` // Maximum percentage of time allowed for serving LES requests
-	LightPeers int `toml:",omitempty"` // Maximum number of LES client peers
+	LightServ    int  `toml:",omitempty"` // Maximum percentage of time allowed for serving LES requests
+	LightPeers   int  `toml:",omitempty"` // Maximum number of LES client peers
+	OnlyAnnounce bool // Maximum number of LES client peers
+
+	// Ultra Light client options
+	ULC *ULCConfig `toml:",omitempty"`
 
 	// Database options
 	SkipBcVersionCheck bool `toml:"-"`
diff --git a/eth/gen_config.go b/eth/gen_config.go
index 2777aa9e8..e05b963ab 100644
--- a/eth/gen_config.go
+++ b/eth/gen_config.go
@@ -23,10 +23,12 @@ func (c Config) MarshalTOML() (interface{}, error) {
 		NetworkId               uint64
 		SyncMode                downloader.SyncMode
 		NoPruning               bool
-		LightServ               int  `toml:",omitempty"`
-		LightPeers              int  `toml:",omitempty"`
-		SkipBcVersionCheck      bool `toml:"-"`
-		DatabaseHandles         int  `toml:"-"`
+		LightServ               int `toml:",omitempty"`
+		LightPeers              int `toml:",omitempty"`
+		OnlyAnnounce            bool
+		ULC                     *ULCConfig `toml:",omitempty"`
+		SkipBcVersionCheck      bool       `toml:"-"`
+		DatabaseHandles         int        `toml:"-"`
 		DatabaseCache           int
 		TrieCleanCache          int
 		TrieDirtyCache          int
@@ -54,6 +56,8 @@ func (c Config) MarshalTOML() (interface{}, error) {
 	enc.NoPruning = c.NoPruning
 	enc.LightServ = c.LightServ
 	enc.LightPeers = c.LightPeers
+	enc.OnlyAnnounce = c.OnlyAnnounce
+	enc.ULC = c.ULC
 	enc.SkipBcVersionCheck = c.SkipBcVersionCheck
 	enc.DatabaseHandles = c.DatabaseHandles
 	enc.DatabaseCache = c.DatabaseCache
@@ -71,6 +75,7 @@ func (c Config) MarshalTOML() (interface{}, error) {
 	enc.Ethash = c.Ethash
 	enc.TxPool = c.TxPool
 	enc.GPO = c.GPO
+
 	enc.EnablePreimageRecording = c.EnablePreimageRecording
 	enc.DocRoot = c.DocRoot
 	enc.EWASMInterpreter = c.EWASMInterpreter
@@ -85,10 +90,12 @@ func (c *Config) UnmarshalTOML(unmarshal func(interface{}) error) error {
 		NetworkId               *uint64
 		SyncMode                *downloader.SyncMode
 		NoPruning               *bool
-		LightServ               *int  `toml:",omitempty"`
-		LightPeers              *int  `toml:",omitempty"`
-		SkipBcVersionCheck      *bool `toml:"-"`
-		DatabaseHandles         *int  `toml:"-"`
+		LightServ               *int `toml:",omitempty"`
+		LightPeers              *int `toml:",omitempty"`
+		OnlyAnnounce            *bool
+		ULC                     *ULCConfig `toml:",omitempty"`
+		SkipBcVersionCheck      *bool      `toml:"-"`
+		DatabaseHandles         *int       `toml:"-"`
 		DatabaseCache           *int
 		TrieCleanCache          *int
 		TrieDirtyCache          *int
@@ -131,6 +138,12 @@ func (c *Config) UnmarshalTOML(unmarshal func(interface{}) error) error {
 	if dec.LightPeers != nil {
 		c.LightPeers = *dec.LightPeers
 	}
+	if dec.OnlyAnnounce != nil {
+		c.OnlyAnnounce = *dec.OnlyAnnounce
+	}
+	if dec.ULC != nil {
+		c.ULC = dec.ULC
+	}
 	if dec.SkipBcVersionCheck != nil {
 		c.SkipBcVersionCheck = *dec.SkipBcVersionCheck
 	}
diff --git a/eth/ulc_config.go b/eth/ulc_config.go
new file mode 100644
index 000000000..effa6da21
--- /dev/null
+++ b/eth/ulc_config.go
@@ -0,0 +1,9 @@
+package eth
+
+const DefaultULCMinTrustedFraction = 75
+
+// ULCConfig is a Ultra Light client options.
+type ULCConfig struct {
+	TrustedServers     []string `toml:",omitempty"` // A list of trusted servers
+	MinTrustedFraction int      `toml:",omitempty"` // Minimum percentage of connected trusted servers to validate trusted (1-100)
+}
-- 
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