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/*
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* Minio Cloud Storage, (C) 2016, 2017 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 cmd
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import (
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"encoding/json"
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"errors"
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"fmt"
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"io/ioutil"
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"net/rpc"
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"os"
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"path/filepath"
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"time"
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router "github.com/gorilla/mux"
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)
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const adminPath = "/admin"
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var errUnsupportedBackend = errors.New("not supported for non erasure-code backend")
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// adminCmd - exports RPC methods for service status, stop and
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// restart commands.
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type adminCmd struct {
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AuthRPCServer
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}
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// ListLocksQuery - wraps ListLocks API's query values to send over RPC.
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type ListLocksQuery struct {
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AuthRPCArgs
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bucket string
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prefix string
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duration time.Duration
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}
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// ListLocksReply - wraps ListLocks response over RPC.
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type ListLocksReply struct {
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AuthRPCReply
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volLocks []VolumeLockInfo
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}
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// UptimeReply - wraps the uptime response over RPC.
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type UptimeReply struct {
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AuthRPCReply
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Uptime time.Duration
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}
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// ConfigReply - wraps the server config response over RPC.
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type ConfigReply struct {
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AuthRPCReply
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Config []byte // json-marshalled bytes of serverConfigV13
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}
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// Restart - Restart this instance of minio server.
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func (s *adminCmd) Restart(args *AuthRPCArgs, reply *AuthRPCReply) error {
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if err := args.IsAuthenticated(); err != nil {
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return err
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}
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globalServiceSignalCh <- serviceRestart
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return nil
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}
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// ListLocks - lists locks held by requests handled by this server instance.
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func (s *adminCmd) ListLocks(query *ListLocksQuery, reply *ListLocksReply) error {
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if err := query.IsAuthenticated(); err != nil {
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return err
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}
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volLocks := listLocksInfo(query.bucket, query.prefix, query.duration)
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*reply = ListLocksReply{volLocks: volLocks}
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return nil
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}
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// ReInitDisk - reinitialize storage disks and object layer to use the
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// new format.
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func (s *adminCmd) ReInitDisks(args *AuthRPCArgs, reply *AuthRPCReply) error {
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if err := args.IsAuthenticated(); err != nil {
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return err
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}
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if !globalIsXL {
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return errUnsupportedBackend
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}
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// Get the current object layer instance.
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objLayer := newObjectLayerFn()
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// Initialize new disks to include the newly formatted disks.
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bootstrapDisks, err := initStorageDisks(globalEndpoints)
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if err != nil {
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return err
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}
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// Initialize new object layer with newly formatted disks.
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newObjectAPI, err := newXLObjects(bootstrapDisks)
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if err != nil {
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return err
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}
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// Replace object layer with newly formatted storage.
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globalObjLayerMutex.Lock()
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globalObjectAPI = newObjectAPI
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globalObjLayerMutex.Unlock()
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// Shutdown storage belonging to old object layer instance.
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objLayer.Shutdown()
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return nil
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}
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// Uptime - returns the time when object layer was initialized on this server.
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func (s *adminCmd) Uptime(args *AuthRPCArgs, reply *UptimeReply) error {
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if err := args.IsAuthenticated(); err != nil {
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return err
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}
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if globalBootTime.IsZero() {
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return errServerNotInitialized
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}
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// N B The uptime is computed assuming that the system time is
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// monotonic. This is not the case in time pkg in Go, see
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// https://github.com/golang/go/issues/12914. This is expected
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// to be fixed by go1.9.
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*reply = UptimeReply{
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Uptime: UTCNow().Sub(globalBootTime),
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}
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return nil
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}
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// GetConfig - returns the config.json of this server.
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func (s *adminCmd) GetConfig(args *AuthRPCArgs, reply *ConfigReply) error {
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if err := args.IsAuthenticated(); err != nil {
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return err
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}
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if serverConfig == nil {
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return errors.New("config not present")
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}
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jsonBytes, err := json.Marshal(serverConfig)
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if err != nil {
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return err
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}
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reply.Config = jsonBytes
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return nil
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}
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// WriteConfigArgs - wraps the bytes to be written and temporary file name.
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type WriteConfigArgs struct {
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AuthRPCArgs
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TmpFileName string
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Buf []byte
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}
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// WriteConfigReply - wraps the result of a writing config into a temporary file.
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// the remote node.
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type WriteConfigReply struct {
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AuthRPCReply
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}
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func writeTmpConfigCommon(tmpFileName string, configBytes []byte) error {
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tmpConfigFile := filepath.Join(getConfigDir(), tmpFileName)
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err := ioutil.WriteFile(tmpConfigFile, configBytes, 0666)
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errorIf(err, fmt.Sprintf("Failed to write to temporary config file %s", tmpConfigFile))
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return err
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}
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// WriteTmpConfig - writes the supplied config contents onto the
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// supplied temporary file.
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func (s *adminCmd) WriteTmpConfig(wArgs *WriteConfigArgs, wReply *WriteConfigReply) error {
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if err := wArgs.IsAuthenticated(); err != nil {
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return err
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}
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return writeTmpConfigCommon(wArgs.TmpFileName, wArgs.Buf)
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}
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// CommitConfigArgs - wraps the config file name that needs to be
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// committed into config.json on this node.
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type CommitConfigArgs struct {
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AuthRPCArgs
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FileName string
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}
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// CommitConfigReply - represents response to commit of config file on
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// this node.
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type CommitConfigReply struct {
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AuthRPCReply
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}
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// CommitConfig - Renames the temporary file into config.json on this node.
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func (s *adminCmd) CommitConfig(cArgs *CommitConfigArgs, cReply *CommitConfigReply) error {
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configFile := getConfigFile()
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tmpConfigFile := filepath.Join(getConfigDir(), cArgs.FileName)
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err := os.Rename(tmpConfigFile, configFile)
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errorIf(err, fmt.Sprintf("Failed to rename %s to %s", tmpConfigFile, configFile))
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return err
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}
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// registerAdminRPCRouter - registers RPC methods for service status,
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// stop and restart commands.
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func registerAdminRPCRouter(mux *router.Router) error {
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adminRPCHandler := &adminCmd{}
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adminRPCServer := rpc.NewServer()
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err := adminRPCServer.RegisterName("Admin", adminRPCHandler)
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if err != nil {
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return traceError(err)
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}
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adminRouter := mux.NewRoute().PathPrefix(minioReservedBucketPath).Subrouter()
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adminRouter.Path(adminPath).Handler(adminRPCServer)
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return nil
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}
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