add use fix gas price option for faucet

Author: unclezoro

cmd/faucet/faucet.go

@@ -82,6 +82,8 @@ var (
 
 	noauthFlag = flag.Bool("noauth", false, "Enables funding requests without authentication")
 	logFlag    = flag.Int("loglevel", 3, "Log level to use for Ethereum and the faucet")
+
+	fixGasPrice = flag.Int64("faucet.fixedprice", 0, "Will use fixed gas price if specified")
 )
 
 var (
@@ -569,8 +571,12 @@ func (f *faucet) refresh(head *types.Header) error {
 	if nonce, err = f.client.NonceAt(ctx, f.account.Address, head.Number); err != nil {
 		return err
 	}
-	if price, err = f.client.SuggestGasPrice(ctx); err != nil {
-		return err
+	if fixGasPrice != nil && *fixGasPrice > 0 {
+		price = big.NewInt(*fixGasPrice)
+	} else {
+		if price, err = f.client.SuggestGasPrice(ctx); err != nil {
+			return err
+		}
 	}
 	// Everything succeeded, update the cached stats and eject old requests
 	f.lock.Lock()