Adopt dsync interface changes and major cleanup on RPC server/client.

* Rename GenericArgs to AuthRPCArgs
* Rename GenericReply to AuthRPCReply
* Remove authConfig.loginMethod and add authConfig.ServiceName
* Rename loginServer to AuthRPCServer
* Rename RPCLoginArgs to LoginRPCArgs
* Rename RPCLoginReply to LoginRPCReply
* Version and RequestTime are added to LoginRPCArgs and verified by
  server side, not client side.
* Fix data race in lockMaintainence loop.

cmd/lock-rpc-client.go

@@ -0,0 +1,71 @@
+/*
+ * Minio Cloud Storage, (C) 2016 Minio, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package cmd
+
+import "github.com/minio/dsync"
+
+// LockRPCClient is authenticable lock RPC client compatible to dsync.NetLocker
+type LockRPCClient struct {
+	*AuthRPCClient
+}
+
+// newLockRPCClient returns new lock RPC client object.
+func newLockRPCClient(config authConfig) *LockRPCClient {
+	return &LockRPCClient{newAuthRPCClient(config)}
+}
+
+// RLock calls read lock RPC.
+func (lockRPCClient *LockRPCClient) RLock(args dsync.LockArgs) (reply bool, err error) {
+	lockArgs := newLockArgs(args)
+	err = lockRPCClient.AuthRPCClient.Call("Dsync.RLock", &lockArgs, &reply)
+	return reply, err
+}
+
+// Lock calls write lock RPC.
+func (lockRPCClient *LockRPCClient) Lock(args dsync.LockArgs) (reply bool, err error) {
+	lockArgs := newLockArgs(args)
+	err = lockRPCClient.AuthRPCClient.Call("Dsync.Lock", &lockArgs, &reply)
+	return reply, err
+}
+
+// RUnlock calls read unlock RPC.
+func (lockRPCClient *LockRPCClient) RUnlock(args dsync.LockArgs) (reply bool, err error) {
+	lockArgs := newLockArgs(args)
+	err = lockRPCClient.AuthRPCClient.Call("Dsync.RUnlock", &lockArgs, &reply)
+	return reply, err
+}
+
+// Unlock calls write unlock RPC.
+func (lockRPCClient *LockRPCClient) Unlock(args dsync.LockArgs) (reply bool, err error) {
+	lockArgs := newLockArgs(args)
+	err = lockRPCClient.AuthRPCClient.Call("Dsync.Unlock", &lockArgs, &reply)
+	return reply, err
+}
+
+// ForceUnlock calls force unlock RPC.
+func (lockRPCClient *LockRPCClient) ForceUnlock(args dsync.LockArgs) (reply bool, err error) {
+	lockArgs := newLockArgs(args)
+	err = lockRPCClient.AuthRPCClient.Call("Dsync.ForceUnlock", &lockArgs, &reply)
+	return reply, err
+}
+
+// Expired calls expired RPC.
+func (lockRPCClient *LockRPCClient) Expired(args dsync.LockArgs) (reply bool, err error) {
+	lockArgs := newLockArgs(args)
+	err = lockRPCClient.AuthRPCClient.Call("Dsync.Expired", &lockArgs, &reply)
+	return reply, err
+}