eth,monitor: min/max gas price logs

CHANGELOG_PENDING.md

@@ -9,6 +9,7 @@
 - \#1911 [Experimental] Enable scene classification for Adult/Soccer (@jailuthra, @yondonfu)
 - \#1915 Use gas price monitor for gas price suggestions for all Ethereum transactions (@kyriediculous)
 - \#1930 Support custom minimum gas price (@yondonfu)
+- \#1942 Log min and max gas price when monitoring is enabled (@kyriediculous)
 
 #### Broadcaster
 

eth/backend.go

@@ -16,6 +16,7 @@ import (
 	"github.com/ethereum/go-ethereum/params"
 	"github.com/golang/glog"
 	"github.com/livepeer/go-livepeer/eth/contracts"
+	"github.com/livepeer/go-livepeer/monitor"
 )
 
 var abis = []string{
@@ -129,6 +130,10 @@ func (b *backend) SetMaxGasPrice(gp *big.Int) {
 	b.Lock()
 	defer b.Unlock()
 	b.maxGasPrice = gp
+
+	if monitor.Enabled {
+		monitor.MaxGasPrice(gp)
+	}
 }
 
 func (b *backend) MaxGasPrice() *big.Int {

eth/gaspricemonitor.go

@@ -70,6 +70,10 @@ func (gpm *GasPriceMonitor) SetMinGasPrice(minGasPrice *big.Int) {
 	gpm.gasPriceMu.Lock()
 	defer gpm.gasPriceMu.Unlock()
 	gpm.minGasPrice = minGasPrice
+
+	if monitor.Enabled {
+		monitor.MinGasPrice(minGasPrice)
+	}
 }
 
 func (gpm *GasPriceMonitor) MinGasPrice() *big.Int {

monitor/census.go

@@ -149,6 +149,8 @@ type (
 		mValueRedeemed         *stats.Float64Measure
 		mTicketRedemptionError *stats.Int64Measure
 		mSuggestedGasPrice     *stats.Float64Measure
+		mMinGasPrice           *stats.Float64Measure
+		mMaxGasPrice           *stats.Float64Measure
 		mTranscodingPrice      *stats.Float64Measure
 
 		// Metrics for pixel accounting
@@ -276,6 +278,8 @@ func InitCensus(nodeType NodeType, version string) {
 	census.mValueRedeemed = stats.Float64("value_redeemed", "ValueRedeemed", "gwei")
 	census.mTicketRedemptionError = stats.Int64("ticket_redemption_errors", "TicketRedemptionError", "tot")
 	census.mSuggestedGasPrice = stats.Float64("suggested_gas_price", "SuggestedGasPrice", "gwei")
+	census.mMinGasPrice = stats.Float64("min_gas_price", "MinGasPrice", "gwei")
+	census.mMaxGasPrice = stats.Float64("max_gas_price", "MaxGasPrice", "gwei")
 	census.mTranscodingPrice = stats.Float64("transcoding_price", "TranscodingPrice", "wei")
 
 	// Metrics for pixel accounting
@@ -687,6 +691,21 @@ func InitCensus(nodeType NodeType, version string) {
 			TagKeys:     baseTags,
 			Aggregation: view.Sum(),
 		},
+		{
+			Name:        "min_gas_price",
+			Measure:     census.mMinGasPrice,
+			Description: "Minimum gas price to use for gas price suggestions",
+			TagKeys:     baseTags,
+			Aggregation: view.LastValue(),
+		},
+		{
+			Name:        "max_gas_price",
+			Measure:     census.mMaxGasPrice,
+			Description: "Maximum gas price to use for gas price suggestions",
+			TagKeys:     baseTags,
+			Aggregation: view.LastValue(),
+		},
+
 		// Metrics for pixel accounting
 		{
 			Name:        "mil_pixels_processed",
@@ -1436,6 +1455,20 @@ func SuggestedGasPrice(gasPrice *big.Int) {
 	stats.Record(census.ctx, census.mSuggestedGasPrice.M(wei2gwei(gasPrice)))
 }
 
+func MinGasPrice(minGasPrice *big.Int) {
+	census.lock.Lock()
+	defer census.lock.Unlock()
+
+	stats.Record(census.ctx, census.mMinGasPrice.M(wei2gwei(minGasPrice)))
+}
+
+func MaxGasPrice(maxGasPrice *big.Int) {
+	census.lock.Lock()
+	defer census.lock.Unlock()
+
+	stats.Record(census.ctx, census.mMaxGasPrice.M(wei2gwei(maxGasPrice)))
+}
+
 // TranscodingPrice records the last transcoding price
 func TranscodingPrice(sender string, price *big.Rat) {
 	census.lock.Lock()