add gasprice param

cmd/kovan/main.go

@@ -133,7 +133,7 @@ func Run(c *cli.Context) error {
 			gethContractClient, err = geth.NewGethContractClient(
 				common.HexToAddress(input.ContractAddress()), kovanRPC,
 				common.HexToAddress(input.MinerAddress()),
-				input.RPCEndpoint(), input.KeystorePath(), passphrase,
+				input.RPCEndpoint(), input.KeystorePath(), passphrase, 0,
 			)
 			if gethContractClient != nil {
 				break

cmd/ropsten/ropsten.go

@@ -71,6 +71,7 @@ func Run(c *cli.Context) error {
 		fmt.Printf("Gateway address %s is invalid.\n", c.String("gateway"))
 		return nil
 	}
+	gasprice := c.Uint("gasprice")
 	smartpool.Output = &smartpool.StdOut{}
 	ethereumWorkPool := &ethereum.WorkPool{}
 	go ethereumWorkPool.Cleanning()
@@ -133,6 +134,7 @@ func Run(c *cli.Context) error {
 				common.HexToAddress(input.ContractAddress()), gethRPC,
 				common.HexToAddress(input.MinerAddress()),
 				input.RPCEndpoint(), input.KeystorePath(), passphrase,
+				uint64(gasprice),
 			)
 			if gethContractClient != nil {
 				break
@@ -211,6 +213,11 @@ func BuildAppCommandLine() *cli.App {
 			Value: 1000000,
 			Usage: "Difficulty of a share.",
 		},
+		cli.UintFlag{
+			Name:  "gasprice",
+			Value: 5,
+			Usage: "Gas price in gwei to use in communication with the contract. Specify 0 if you let your Ethereum Client decide on gas price.",
+		},
 		cli.StringFlag{
 			Name:  "spcontract",
 			Value: "0xf7d93BCB8e4372F46383ecee82f9adF1aA397BA9",

ethereum/geth/geth_contract_client.go

@@ -210,7 +210,7 @@ func getClient(rpc string) (*ethclient.Client, error) {
 
 func NewGethContractClient(
 	contractAddr common.Address, node ethereum.RPCClient, miner common.Address,
-	ipc, keystorePath, passphrase string) (*GethContractClient, error) {
+	ipc, keystorePath, passphrase string, gasprice uint64) (*GethContractClient, error) {
 	client, err := getClient(ipc)
 	if err != nil {
 		smartpool.Output.Printf("Couldn't connect to Geth via IPC file. Error: %s\n", err)
@@ -238,7 +238,10 @@ func NewGethContractClient(
 		return nil, err
 	}
 	// TODO: make gas price one command line flag
-	auth.GasPrice = big.NewInt(10000000000)
+	if gasprice != 0 {
+		auth.GasPrice = big.NewInt(int64(gasprice * 1000000000))
+		smartpool.Output.Printf("Gas price is set to: %s wei.\n", auth.GasPrice.Text(10))
+	}
 	smartpool.Output.Printf("Done.\n")
 	return &GethContractClient{pool, auth, node, miner}, nil
 }