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minio/cmd/admin-rpc-server.go

148 lines
3.8 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 cmd
import (
"errors"
"net/rpc"
"time"
router "github.com/gorilla/mux"
)
const adminPath = "/admin"
var errUnsupportedBackend = errors.New("not supported for non erasure-code backend")
// adminCmd - exports RPC methods for service status, stop and
// restart commands.
type adminCmd struct {
AuthRPCServer
}
// ListLocksQuery - wraps ListLocks API's query values to send over RPC.
type ListLocksQuery struct {
AuthRPCArgs
bucket string
prefix string
duration time.Duration
}
// ListLocksReply - wraps ListLocks response over RPC.
type ListLocksReply struct {
AuthRPCReply
volLocks []VolumeLockInfo
}
// UptimeReply - wraps the uptime response over RPC.
type UptimeReply struct {
AuthRPCReply
Uptime time.Duration
}
// Restart - Restart this instance of minio server.
func (s *adminCmd) Restart(args *AuthRPCArgs, reply *AuthRPCReply) error {
if err := args.IsAuthenticated(); err != nil {
return err
}
globalServiceSignalCh <- serviceRestart
return nil
}
// ListLocks - lists locks held by requests handled by this server instance.
func (s *adminCmd) ListLocks(query *ListLocksQuery, reply *ListLocksReply) error {
if err := query.IsAuthenticated(); err != nil {
return err
}
volLocks := listLocksInfo(query.bucket, query.prefix, query.duration)
*reply = ListLocksReply{volLocks: volLocks}
return nil
}
// ReInitDisk - reinitialize storage disks and object layer to use the
// new format.
func (s *adminCmd) ReInitDisks(args *AuthRPCArgs, reply *AuthRPCReply) error {
if err := args.IsAuthenticated(); err != nil {
return err
}
if !globalIsXL {
return errUnsupportedBackend
}
// Get the current object layer instance.
objLayer := newObjectLayerFn()
// Initialize new disks to include the newly formatted disks.
bootstrapDisks, err := initStorageDisks(globalEndpoints)
if err != nil {
return err
}
// Initialize new object layer with newly formatted disks.
newObjectAPI, err := newXLObjects(bootstrapDisks)
if err != nil {
return err
}
// Replace object layer with newly formatted storage.
globalObjLayerMutex.Lock()
globalObjectAPI = newObjectAPI
globalObjLayerMutex.Unlock()
// Shutdown storage belonging to old object layer instance.
objLayer.Shutdown()
return nil
}
// Uptime - returns the time when object layer was initialized on this server.
func (s *adminCmd) Uptime(args *AuthRPCArgs, reply *UptimeReply) error {
if err := args.IsAuthenticated(); err != nil {
return err
}
if globalBootTime.IsZero() {
return errServerNotInitialized
}
// N B The uptime is computed assuming that the system time is
// monotonic. This is not the case in time pkg in Go, see
// https://github.com/golang/go/issues/12914. This is expected
// to be fixed by go1.9.
*reply = UptimeReply{
Uptime: time.Now().UTC().Sub(globalBootTime),
}
return nil
}
// registerAdminRPCRouter - registers RPC methods for service status,
// stop and restart commands.
func registerAdminRPCRouter(mux *router.Router) error {
adminRPCHandler := &adminCmd{}
adminRPCServer := rpc.NewServer()
err := adminRPCServer.RegisterName("Admin", adminRPCHandler)
if err != nil {
return traceError(err)
}
adminRouter := mux.NewRoute().PathPrefix(reservedBucket).Subrouter()
adminRouter.Path(adminPath).Handler(adminRPCServer)
return nil
}