rpc/api: fix #1972 api regression (nil eth panic) in attach

rpc/api/admin.go

@@ -32,7 +32,6 @@ import (
 	"github.com/ethereum/go-ethereum/crypto"
 	"github.com/ethereum/go-ethereum/eth"
 	"github.com/ethereum/go-ethereum/logger/glog"
-	"github.com/ethereum/go-ethereum/p2p"
 	"github.com/ethereum/go-ethereum/rlp"
 	"github.com/ethereum/go-ethereum/rpc/codec"
 	"github.com/ethereum/go-ethereum/rpc/comms"
@@ -81,17 +80,15 @@ type adminhandler func(*adminApi, *shared.Request) (interface{}, error)
 // admin api provider
 type adminApi struct {
 	xeth     *xeth.XEth
-	network  *p2p.Server
 	ethereum *eth.Ethereum
 	codec    codec.Codec
 	coder    codec.ApiCoder
 }
 
 // create a new admin api instance
-func NewAdminApi(xeth *xeth.XEth, network *p2p.Server, ethereum *eth.Ethereum, codec codec.Codec) *adminApi {
+func NewAdminApi(xeth *xeth.XEth, ethereum *eth.Ethereum, codec codec.Codec) *adminApi {
 	return &adminApi{
 		xeth:     xeth,
-		network:  network,
 		ethereum: ethereum,
 		codec:    codec,
 		coder:    codec.New(nil),
@@ -140,11 +137,11 @@ func (self *adminApi) AddPeer(req *shared.Request) (interface{}, error) {
 }
 
 func (self *adminApi) Peers(req *shared.Request) (interface{}, error) {
-	return self.network.PeersInfo(), nil
+	return self.ethereum.Network().PeersInfo(), nil
 }
 
 func (self *adminApi) NodeInfo(req *shared.Request) (interface{}, error) {
-	return self.network.NodeInfo(), nil
+	return self.ethereum.Network().NodeInfo(), nil
 }
 
 func (self *adminApi) DataDir(req *shared.Request) (interface{}, error) {

rpc/api/utils.go

@@ -165,7 +165,7 @@ func ParseApiString(apistr string, codec codec.Codec, xeth *xeth.XEth, eth *eth.
 	for i, name := range names {
 		switch strings.ToLower(strings.TrimSpace(name)) {
 		case shared.AdminApiName:
-			apis[i] = NewAdminApi(xeth, eth.Network(), eth, codec)
+			apis[i] = NewAdminApi(xeth, eth, codec)
 		case shared.DebugApiName:
 			apis[i] = NewDebugApi(xeth, eth, codec)
 		case shared.DbApiName: