mirror of https://github.com/minio/minio.git
125 lines
3.8 KiB
Go
125 lines
3.8 KiB
Go
/*
|
|
* 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 dsync_test
|
|
|
|
import (
|
|
"context"
|
|
"net/rpc"
|
|
"sync"
|
|
|
|
. "github.com/minio/minio/pkg/dsync"
|
|
)
|
|
|
|
// ReconnectRPCClient is a wrapper type for rpc.Client which provides reconnect on first failure.
|
|
type ReconnectRPCClient struct {
|
|
mutex sync.Mutex
|
|
rpc *rpc.Client
|
|
addr string
|
|
endpoint string
|
|
}
|
|
|
|
// newClient constructs a ReconnectRPCClient object with addr and endpoint initialized.
|
|
// It _doesn't_ connect to the remote endpoint. See Call method to see when the
|
|
// connect happens.
|
|
func newClient(addr, endpoint string) NetLocker {
|
|
return &ReconnectRPCClient{
|
|
addr: addr,
|
|
endpoint: endpoint,
|
|
}
|
|
}
|
|
|
|
// Close closes the underlying socket file descriptor.
|
|
func (rpcClient *ReconnectRPCClient) IsOnline() bool {
|
|
rpcClient.mutex.Lock()
|
|
defer rpcClient.mutex.Unlock()
|
|
// If rpc client has not connected yet there is nothing to close.
|
|
return rpcClient.rpc != nil
|
|
}
|
|
|
|
func (rpcClient *ReconnectRPCClient) IsLocal() bool {
|
|
return false
|
|
}
|
|
|
|
// Close closes the underlying socket file descriptor.
|
|
func (rpcClient *ReconnectRPCClient) Close() error {
|
|
rpcClient.mutex.Lock()
|
|
defer rpcClient.mutex.Unlock()
|
|
// If rpc client has not connected yet there is nothing to close.
|
|
if rpcClient.rpc == nil {
|
|
return nil
|
|
}
|
|
// Reset rpcClient.rpc to allow for subsequent calls to use a new
|
|
// (socket) connection.
|
|
clnt := rpcClient.rpc
|
|
rpcClient.rpc = nil
|
|
return clnt.Close()
|
|
}
|
|
|
|
// Call makes a RPC call to the remote endpoint using the default codec, namely encoding/gob.
|
|
func (rpcClient *ReconnectRPCClient) Call(serviceMethod string, args interface{}, reply interface{}) (err error) {
|
|
rpcClient.mutex.Lock()
|
|
defer rpcClient.mutex.Unlock()
|
|
dialCall := func() error {
|
|
// If the rpc.Client is nil, we attempt to (re)connect with the remote endpoint.
|
|
if rpcClient.rpc == nil {
|
|
clnt, derr := rpc.DialHTTPPath("tcp", rpcClient.addr, rpcClient.endpoint)
|
|
if derr != nil {
|
|
return derr
|
|
}
|
|
rpcClient.rpc = clnt
|
|
}
|
|
// If the RPC fails due to a network-related error, then we reset
|
|
// rpc.Client for a subsequent reconnect.
|
|
return rpcClient.rpc.Call(serviceMethod, args, reply)
|
|
}
|
|
if err = dialCall(); err == rpc.ErrShutdown {
|
|
rpcClient.rpc.Close()
|
|
rpcClient.rpc = nil
|
|
err = dialCall()
|
|
}
|
|
return err
|
|
}
|
|
|
|
func (rpcClient *ReconnectRPCClient) RLock(ctx context.Context, args LockArgs) (status bool, err error) {
|
|
err = rpcClient.Call("Dsync.RLock", &args, &status)
|
|
return status, err
|
|
}
|
|
|
|
func (rpcClient *ReconnectRPCClient) Lock(ctx context.Context, args LockArgs) (status bool, err error) {
|
|
err = rpcClient.Call("Dsync.Lock", &args, &status)
|
|
return status, err
|
|
}
|
|
|
|
func (rpcClient *ReconnectRPCClient) RUnlock(args LockArgs) (status bool, err error) {
|
|
err = rpcClient.Call("Dsync.RUnlock", &args, &status)
|
|
return status, err
|
|
}
|
|
|
|
func (rpcClient *ReconnectRPCClient) Unlock(args LockArgs) (status bool, err error) {
|
|
err = rpcClient.Call("Dsync.Unlock", &args, &status)
|
|
return status, err
|
|
}
|
|
|
|
func (rpcClient *ReconnectRPCClient) Expired(ctx context.Context, args LockArgs) (expired bool, err error) {
|
|
err = rpcClient.Call("Dsync.Expired", &args, &expired)
|
|
return expired, err
|
|
}
|
|
|
|
func (rpcClient *ReconnectRPCClient) String() string {
|
|
return "http://" + rpcClient.addr + "/" + rpcClient.endpoint
|
|
}
|