adds eth_hashrate RPC method

eth/backend.go

@@ -341,6 +341,7 @@ func (s *Ethereum) Etherbase() (eb common.Address, err error) {
 
 func (s *Ethereum) StopMining()         { s.miner.Stop() }
 func (s *Ethereum) IsMining() bool      { return s.miner.Mining() }
+func (s *Ethereum) HashRate() int64     { return s.miner.HashRate() }
 func (s *Ethereum) Miner() *miner.Miner { return s.miner }
 
 // func (s *Ethereum) Logger() logger.LogSystem             { return s.logger }

rpc/api.go

@@ -62,6 +62,8 @@ func (api *EthereumApi) GetRequestReply(req *RpcRequest, reply *interface{}) err
 		*reply = newHexData(api.xeth().Coinbase())
 	case "eth_mining":
 		*reply = api.xeth().IsMining()
+	case "eth_hashrate":
+		*reply = api.xeth().HashRate()
 	case "eth_gasPrice":
 		v := xeth.DefaultGas()
 		*reply = newHexData(v.Bytes())

xeth/xeth.go

@@ -276,6 +276,10 @@ func (self *XEth) IsMining() bool {
 	return self.backend.IsMining()
 }
 
+func (self *XEth) HashRate() int64 {
+	return self.backend.HashRate()
+}
+
 func (self *XEth) EthVersion() string {
 	return fmt.Sprintf("%d", self.backend.EthVersion())
 }