From 4b434d8c143b190a515998898e15a84aea9c1df2 Mon Sep 17 00:00:00 2001
From: gary rong <garyrong0905@gmail.com>
Date: Wed, 9 Sep 2020 23:38:47 +0800
Subject: [PATCH] cmd, eth: offer maxprice flag for overwritting price cap
 (#21531)

* cmd, eth: offer maxprice flag for overwritting price cap

* eth: rename default price cap
---
 cmd/geth/main.go         |  1 +
 cmd/geth/usage.go        |  1 +
 cmd/utils/flags.go       |  8 ++++++++
 eth/config.go            |  2 ++
 eth/gasprice/gasprice.go | 18 +++++++++++++++---
 5 files changed, 27 insertions(+), 3 deletions(-)

diff --git a/cmd/geth/main.go b/cmd/geth/main.go
index ccc6358996b62..677a19eed2cdb 100644
--- a/cmd/geth/main.go
+++ b/cmd/geth/main.go
@@ -154,6 +154,7 @@ var (
 		utils.LegacyGpoBlocksFlag,
 		utils.GpoPercentileFlag,
 		utils.LegacyGpoPercentileFlag,
+		utils.GpoMaxGasPriceFlag,
 		utils.EWASMInterpreterFlag,
 		utils.EVMInterpreterFlag,
 		configFileFlag,
diff --git a/cmd/geth/usage.go b/cmd/geth/usage.go
index 5e004c42bea9a..334a729c24d8c 100644
--- a/cmd/geth/usage.go
+++ b/cmd/geth/usage.go
@@ -189,6 +189,7 @@ var AppHelpFlagGroups = []flags.FlagGroup{
 		Flags: []cli.Flag{
 			utils.GpoBlocksFlag,
 			utils.GpoPercentileFlag,
+			utils.GpoMaxGasPriceFlag,
 		},
 	},
 	{
diff --git a/cmd/utils/flags.go b/cmd/utils/flags.go
index e6382c163498a..2c57e533edd7b 100644
--- a/cmd/utils/flags.go
+++ b/cmd/utils/flags.go
@@ -631,6 +631,11 @@ var (
 		Usage: "Suggested gas price is the given percentile of a set of recent transaction gas prices",
 		Value: eth.DefaultConfig.GPO.Percentile,
 	}
+	GpoMaxGasPriceFlag = cli.Int64Flag{
+		Name:  "gpo.maxprice",
+		Usage: "Maximum gas price will be recommended by gpo",
+		Value: eth.DefaultConfig.GPO.MaxPrice.Int64(),
+	}
 	WhisperEnabledFlag = cli.BoolFlag{
 		Name:  "shh",
 		Usage: "Enable Whisper",
@@ -1291,6 +1296,9 @@ func setGPO(ctx *cli.Context, cfg *gasprice.Config, light bool) {
 	if ctx.GlobalIsSet(GpoPercentileFlag.Name) {
 		cfg.Percentile = ctx.GlobalInt(GpoPercentileFlag.Name)
 	}
+	if ctx.GlobalIsSet(GpoMaxGasPriceFlag.Name) {
+		cfg.MaxPrice = big.NewInt(ctx.GlobalInt64(GpoMaxGasPriceFlag.Name))
+	}
 }
 
 func setTxPool(ctx *cli.Context, cfg *core.TxPoolConfig) {
diff --git a/eth/config.go b/eth/config.go
index 1074e5a3718df..0d99c2a3f1e61 100644
--- a/eth/config.go
+++ b/eth/config.go
@@ -37,12 +37,14 @@ import (
 var DefaultFullGPOConfig = gasprice.Config{
 	Blocks:     20,
 	Percentile: 60,
+	MaxPrice:   gasprice.DefaultMaxPrice,
 }
 
 // DefaultLightGPOConfig contains default gasprice oracle settings for light client.
 var DefaultLightGPOConfig = gasprice.Config{
 	Blocks:     2,
 	Percentile: 60,
+	MaxPrice:   gasprice.DefaultMaxPrice,
 }
 
 // DefaultConfig contains default settings for use on the Ethereum main net.
diff --git a/eth/gasprice/gasprice.go b/eth/gasprice/gasprice.go
index b9eff3d11a12d..5d8be08e0b78c 100644
--- a/eth/gasprice/gasprice.go
+++ b/eth/gasprice/gasprice.go
@@ -24,18 +24,20 @@ import (
 
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/core/types"
+	"github.com/ethereum/go-ethereum/log"
 	"github.com/ethereum/go-ethereum/params"
 	"github.com/ethereum/go-ethereum/rpc"
 )
 
 const sampleNumber = 3 // Number of transactions sampled in a block
 
-var maxPrice = big.NewInt(500 * params.GWei)
+var DefaultMaxPrice = big.NewInt(500 * params.GWei)
 
 type Config struct {
 	Blocks     int
 	Percentile int
 	Default    *big.Int `toml:",omitempty"`
+	MaxPrice   *big.Int `toml:",omitempty"`
 }
 
 // OracleBackend includes all necessary background APIs for oracle.
@@ -51,6 +53,7 @@ type Oracle struct {
 	backend   OracleBackend
 	lastHead  common.Hash
 	lastPrice *big.Int
+	maxPrice  *big.Int
 	cacheLock sync.RWMutex
 	fetchLock sync.Mutex
 
@@ -64,17 +67,26 @@ func NewOracle(backend OracleBackend, params Config) *Oracle {
 	blocks := params.Blocks
 	if blocks < 1 {
 		blocks = 1
+		log.Warn("Sanitizing invalid gasprice oracle sample blocks", "provided", params.Blocks, "updated", blocks)
 	}
 	percent := params.Percentile
 	if percent < 0 {
 		percent = 0
+		log.Warn("Sanitizing invalid gasprice oracle sample percentile", "provided", params.Percentile, "updated", percent)
 	}
 	if percent > 100 {
 		percent = 100
+		log.Warn("Sanitizing invalid gasprice oracle sample percentile", "provided", params.Percentile, "updated", percent)
+	}
+	maxPrice := params.MaxPrice
+	if maxPrice == nil || maxPrice.Int64() <= 0 {
+		maxPrice = DefaultMaxPrice
+		log.Warn("Sanitizing invalid gasprice oracle price cap", "provided", params.MaxPrice, "updated", maxPrice)
 	}
 	return &Oracle{
 		backend:     backend,
 		lastPrice:   params.Default,
+		maxPrice:    maxPrice,
 		checkBlocks: blocks,
 		percentile:  percent,
 	}
@@ -146,8 +158,8 @@ func (gpo *Oracle) SuggestPrice(ctx context.Context) (*big.Int, error) {
 		sort.Sort(bigIntArray(txPrices))
 		price = txPrices[(len(txPrices)-1)*gpo.percentile/100]
 	}
-	if price.Cmp(maxPrice) > 0 {
-		price = new(big.Int).Set(maxPrice)
+	if price.Cmp(gpo.maxPrice) > 0 {
+		price = new(big.Int).Set(gpo.maxPrice)
 	}
 	gpo.cacheLock.Lock()
 	gpo.lastHead = headHash