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minio/cmd/admin-rpc-server.go

231 lines
6.0 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 (
"encoding/json"
"errors"
"fmt"
"io/ioutil"
"net/rpc"
"os"
"path/filepath"
"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
}
// ConfigReply - wraps the server config response over RPC.
type ConfigReply struct {
AuthRPCReply
Config []byte // json-marshalled bytes of serverConfigV13
}
// 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
}
// GetConfig - returns the config.json of this server.
func (s *adminCmd) GetConfig(args *AuthRPCArgs, reply *ConfigReply) error {
if err := args.IsAuthenticated(); err != nil {
return err
}
if serverConfig == nil {
return errors.New("config not present")
}
jsonBytes, err := json.Marshal(serverConfig)
if err != nil {
return err
}
reply.Config = jsonBytes
return nil
}
// WriteConfigArgs - wraps the bytes to be written and temporary file name.
type WriteConfigArgs struct {
AuthRPCArgs
TmpFileName string
Buf []byte
}
// WriteConfigReply - wraps the result of a writing config into a temporary file.
// the remote node.
type WriteConfigReply struct {
AuthRPCReply
}
func writeTmpConfigCommon(tmpFileName string, configBytes []byte) error {
tmpConfigFile := filepath.Join(getConfigDir(), tmpFileName)
err := ioutil.WriteFile(tmpConfigFile, configBytes, 0666)
errorIf(err, fmt.Sprintf("Failed to write to temporary config file %s", tmpConfigFile))
return err
}
// WriteTmpConfig - writes the supplied config contents onto the
// supplied temporary file.
func (s *adminCmd) WriteTmpConfig(wArgs *WriteConfigArgs, wReply *WriteConfigReply) error {
if err := wArgs.IsAuthenticated(); err != nil {
return err
}
return writeTmpConfigCommon(wArgs.TmpFileName, wArgs.Buf)
}
// CommitConfigArgs - wraps the config file name that needs to be
// committed into config.json on this node.
type CommitConfigArgs struct {
AuthRPCArgs
FileName string
}
// CommitConfigReply - represents response to commit of config file on
// this node.
type CommitConfigReply struct {
AuthRPCReply
}
// CommitConfig - Renames the temporary file into config.json on this node.
func (s *adminCmd) CommitConfig(cArgs *CommitConfigArgs, cReply *CommitConfigReply) error {
configFile := getConfigFile()
tmpConfigFile := filepath.Join(getConfigDir(), cArgs.FileName)
err := os.Rename(tmpConfigFile, configFile)
errorIf(err, fmt.Sprintf("Failed to rename %s to %s", tmpConfigFile, configFile))
return err
}
// 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(minioReservedBucketPath).Subrouter()
adminRouter.Path(adminPath).Handler(adminRPCServer)
return nil
}