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minio/pkg/dsync/rpc-client-interface.go

71 lines
2.5 KiB

/*
* 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
import "context"
// LockArgs is minimal required values for any dsync compatible lock operation.
type LockArgs struct {
// Unique ID of lock/unlock request.
UID string
// Resources contains single or multiple entries to be locked/unlocked.
Resources []string
// Source contains the line number, function and file name of the code
// on the client node that requested the lock.
Source string
// Owner represents unique ID for this instance, an owner who originally requested
// the locked resource, useful primarily in figuring our stale locks.
Owner string
}
// NetLocker is dsync compatible locker interface.
type NetLocker interface {
// Do read lock for given LockArgs. It should return
// * a boolean to indicate success/failure of the operation
// * an error on failure of lock request operation.
RLock(ctx context.Context, args LockArgs) (bool, error)
// Do write lock for given LockArgs. It should return
// * a boolean to indicate success/failure of the operation
// * an error on failure of lock request operation.
Lock(ctx context.Context, args LockArgs) (bool, error)
// Do read unlock for given LockArgs. It should return
// * a boolean to indicate success/failure of the operation
// * an error on failure of unlock request operation.
RUnlock(args LockArgs) (bool, error)
// Do write unlock for given LockArgs. It should return
// * a boolean to indicate success/failure of the operation
// * an error on failure of unlock request operation.
Unlock(args LockArgs) (bool, error)
// Expired returns if current lock args has expired.
Expired(ctx context.Context, args LockArgs) (bool, error)
// Returns underlying endpoint of this lock client instance.
String() string
// Close closes any underlying connection to the service endpoint
Close() error
// Is the underlying connection online? (is always true for any local lockers)
IsOnline() bool
}