120 lines
3.6 KiB
Go
120 lines
3.6 KiB
Go
/*
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* Minio Cloud Storage, (C) 2016 Minio, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package dsync_test
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import (
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"net/rpc"
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"sync"
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. "github.com/minio/minio/pkg/dsync"
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)
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// ReconnectRPCClient is a wrapper type for rpc.Client which provides reconnect on first failure.
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type ReconnectRPCClient struct {
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mutex sync.Mutex
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rpc *rpc.Client
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addr string
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endpoint string
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}
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// newClient constructs a ReconnectRPCClient object with addr and endpoint initialized.
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// It _doesn't_ connect to the remote endpoint. See Call method to see when the
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// connect happens.
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func newClient(addr, endpoint string) NetLocker {
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return &ReconnectRPCClient{
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addr: addr,
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endpoint: endpoint,
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}
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}
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// Close closes the underlying socket file descriptor.
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func (rpcClient *ReconnectRPCClient) IsOnline() bool {
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rpcClient.mutex.Lock()
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defer rpcClient.mutex.Unlock()
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// If rpc client has not connected yet there is nothing to close.
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return rpcClient.rpc != nil
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}
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// Close closes the underlying socket file descriptor.
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func (rpcClient *ReconnectRPCClient) Close() error {
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rpcClient.mutex.Lock()
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defer rpcClient.mutex.Unlock()
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// If rpc client has not connected yet there is nothing to close.
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if rpcClient.rpc == nil {
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return nil
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}
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// Reset rpcClient.rpc to allow for subsequent calls to use a new
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// (socket) connection.
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clnt := rpcClient.rpc
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rpcClient.rpc = nil
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return clnt.Close()
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}
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// Call makes a RPC call to the remote endpoint using the default codec, namely encoding/gob.
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func (rpcClient *ReconnectRPCClient) Call(serviceMethod string, args interface{}, reply interface{}) (err error) {
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rpcClient.mutex.Lock()
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defer rpcClient.mutex.Unlock()
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dialCall := func() error {
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// If the rpc.Client is nil, we attempt to (re)connect with the remote endpoint.
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if rpcClient.rpc == nil {
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clnt, derr := rpc.DialHTTPPath("tcp", rpcClient.addr, rpcClient.endpoint)
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if derr != nil {
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return derr
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}
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rpcClient.rpc = clnt
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}
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// If the RPC fails due to a network-related error, then we reset
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// rpc.Client for a subsequent reconnect.
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return rpcClient.rpc.Call(serviceMethod, args, reply)
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}
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if err = dialCall(); err == rpc.ErrShutdown {
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rpcClient.rpc.Close()
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rpcClient.rpc = nil
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err = dialCall()
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}
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return err
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}
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func (rpcClient *ReconnectRPCClient) RLock(args LockArgs) (status bool, err error) {
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err = rpcClient.Call("Dsync.RLock", &args, &status)
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return status, err
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}
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func (rpcClient *ReconnectRPCClient) Lock(args LockArgs) (status bool, err error) {
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err = rpcClient.Call("Dsync.Lock", &args, &status)
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return status, err
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}
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func (rpcClient *ReconnectRPCClient) RUnlock(args LockArgs) (status bool, err error) {
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err = rpcClient.Call("Dsync.RUnlock", &args, &status)
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return status, err
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}
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func (rpcClient *ReconnectRPCClient) Unlock(args LockArgs) (status bool, err error) {
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err = rpcClient.Call("Dsync.Unlock", &args, &status)
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return status, err
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}
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func (rpcClient *ReconnectRPCClient) Expired(args LockArgs) (expired bool, err error) {
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err = rpcClient.Call("Dsync.Expired", &args, &expired)
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return expired, err
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}
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func (rpcClient *ReconnectRPCClient) String() string {
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return "http://" + rpcClient.addr + "/" + rpcClient.endpoint
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}
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