xeth, core, event/filter, rpc: new block and transaction filters

rpc/responses.go

@@ -3,6 +3,7 @@ package rpc
 import (
 	"encoding/json"
 
+	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/core/state"
 	"github.com/ethereum/go-ethereum/core/types"
 )
@@ -303,3 +304,13 @@ func NewLogsRes(logs state.Logs) (ls []LogRes) {
 
 	return
 }
+
+func NewHashesRes(hs []common.Hash) []string {
+	hashes := make([]string, len(hs))
+
+	for i, hash := range hs {
+		hashes[i] = hash.Hex()
+	}
+
+	return hashes
+}