mirror of
https://github.com/minio/minio
synced 2024-11-05 17:34:01 +00:00
7be7109471
Co-authored-by: Anis Elleuch <anis@min.io> Co-authored-by: Harshavardhana <harsha@minio.io>
289 lines
7.3 KiB
Go
289 lines
7.3 KiB
Go
/*
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* Minio Cloud Storage, (C) 2019 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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"bufio"
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"context"
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"errors"
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"net/http"
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"sort"
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"strconv"
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"time"
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"github.com/gorilla/mux"
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"github.com/minio/minio/pkg/dsync"
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)
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const (
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// Lock maintenance interval.
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lockMaintenanceInterval = 1 * time.Minute
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// Lock validity duration
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lockValidityDuration = 20 * time.Second
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)
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// To abstract a node over network.
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type lockRESTServer struct {
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ll *localLocker
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}
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func (l *lockRESTServer) writeErrorResponse(w http.ResponseWriter, err error) {
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w.WriteHeader(http.StatusForbidden)
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w.Write([]byte(err.Error()))
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}
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// IsValid - To authenticate and verify the time difference.
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func (l *lockRESTServer) IsValid(w http.ResponseWriter, r *http.Request) bool {
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if l.ll == nil {
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l.writeErrorResponse(w, errLockNotInitialized)
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return false
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}
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if err := storageServerRequestValidate(r); err != nil {
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l.writeErrorResponse(w, err)
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return false
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}
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return true
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}
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func getLockArgs(r *http.Request) (args dsync.LockArgs, err error) {
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quorum, err := strconv.Atoi(r.URL.Query().Get(lockRESTQuorum))
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if err != nil {
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return args, err
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}
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args = dsync.LockArgs{
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Owner: r.URL.Query().Get(lockRESTOwner),
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UID: r.URL.Query().Get(lockRESTUID),
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Source: r.URL.Query().Get(lockRESTSource),
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Quorum: quorum,
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}
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var resources []string
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bio := bufio.NewScanner(r.Body)
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for bio.Scan() {
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resources = append(resources, bio.Text())
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}
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if err := bio.Err(); err != nil {
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return args, err
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}
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sort.Strings(resources)
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args.Resources = resources
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return args, nil
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}
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// HealthHandler returns success if request is authenticated.
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func (l *lockRESTServer) HealthHandler(w http.ResponseWriter, r *http.Request) {
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l.IsValid(w, r)
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}
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// RefreshHandler - refresh the current lock
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func (l *lockRESTServer) RefreshHandler(w http.ResponseWriter, r *http.Request) {
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if !l.IsValid(w, r) {
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l.writeErrorResponse(w, errors.New("invalid request"))
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return
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}
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args, err := getLockArgs(r)
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if err != nil {
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l.writeErrorResponse(w, err)
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return
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}
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refreshed, err := l.ll.Refresh(r.Context(), args)
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if err != nil {
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l.writeErrorResponse(w, err)
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return
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}
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if !refreshed {
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l.writeErrorResponse(w, errLockNotFound)
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return
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}
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}
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// LockHandler - Acquires a lock.
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func (l *lockRESTServer) LockHandler(w http.ResponseWriter, r *http.Request) {
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if !l.IsValid(w, r) {
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l.writeErrorResponse(w, errors.New("invalid request"))
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return
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}
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args, err := getLockArgs(r)
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if err != nil {
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l.writeErrorResponse(w, err)
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return
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}
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success, err := l.ll.Lock(r.Context(), args)
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if err == nil && !success {
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err = errLockConflict
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}
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if err != nil {
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l.writeErrorResponse(w, err)
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return
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}
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}
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// UnlockHandler - releases the acquired lock.
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func (l *lockRESTServer) UnlockHandler(w http.ResponseWriter, r *http.Request) {
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if !l.IsValid(w, r) {
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l.writeErrorResponse(w, errors.New("invalid request"))
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return
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}
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args, err := getLockArgs(r)
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if err != nil {
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l.writeErrorResponse(w, err)
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return
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}
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_, err = l.ll.Unlock(args)
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// Ignore the Unlock() "reply" return value because if err == nil, "reply" is always true
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// Consequently, if err != nil, reply is always false
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if err != nil {
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l.writeErrorResponse(w, err)
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return
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}
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}
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// LockHandler - Acquires an RLock.
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func (l *lockRESTServer) RLockHandler(w http.ResponseWriter, r *http.Request) {
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if !l.IsValid(w, r) {
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l.writeErrorResponse(w, errors.New("invalid request"))
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return
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}
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args, err := getLockArgs(r)
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if err != nil {
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l.writeErrorResponse(w, err)
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return
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}
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success, err := l.ll.RLock(r.Context(), args)
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if err == nil && !success {
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err = errLockConflict
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}
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if err != nil {
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l.writeErrorResponse(w, err)
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return
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}
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}
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// RUnlockHandler - releases the acquired read lock.
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func (l *lockRESTServer) RUnlockHandler(w http.ResponseWriter, r *http.Request) {
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if !l.IsValid(w, r) {
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l.writeErrorResponse(w, errors.New("invalid request"))
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return
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}
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args, err := getLockArgs(r)
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if err != nil {
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l.writeErrorResponse(w, err)
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return
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}
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// Ignore the RUnlock() "reply" return value because if err == nil, "reply" is always true.
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// Consequently, if err != nil, reply is always false
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if _, err = l.ll.RUnlock(args); err != nil {
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l.writeErrorResponse(w, err)
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return
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}
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}
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// ForceUnlockHandler - query expired lock status.
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func (l *lockRESTServer) ForceUnlockHandler(w http.ResponseWriter, r *http.Request) {
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if !l.IsValid(w, r) {
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l.writeErrorResponse(w, errors.New("invalid request"))
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return
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}
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args, err := getLockArgs(r)
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if err != nil {
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l.writeErrorResponse(w, err)
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return
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}
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if _, err = l.ll.ForceUnlock(r.Context(), args); err != nil {
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l.writeErrorResponse(w, err)
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return
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}
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}
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// lockMaintenance loops over all locks and discards locks
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// that have not been refreshed for some time.
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func lockMaintenance(ctx context.Context) {
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// Wait until the object API is ready
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// no need to start the lock maintenance
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// if ObjectAPI is not initialized.
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var objAPI ObjectLayer
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for {
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objAPI = newObjectLayerFn()
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if objAPI == nil {
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time.Sleep(time.Second)
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continue
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}
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break
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}
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if _, ok := objAPI.(*erasureServerPools); !ok {
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return
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}
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// Initialize a new ticker with 1 minute between each ticks.
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lkTimer := time.NewTimer(lockMaintenanceInterval)
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// Stop the timer upon returning.
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defer lkTimer.Stop()
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for {
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// Verifies every minute for locks held more than 2 minutes.
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select {
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case <-ctx.Done():
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return
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case <-lkTimer.C:
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// Reset the timer for next cycle.
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lkTimer.Reset(lockMaintenanceInterval)
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globalLockServer.expireOldLocks(lockValidityDuration)
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}
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}
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}
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// registerLockRESTHandlers - register lock rest router.
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func registerLockRESTHandlers(router *mux.Router) {
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lockServer := &lockRESTServer{
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ll: newLocker(),
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}
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subrouter := router.PathPrefix(lockRESTPrefix).Subrouter()
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subrouter.Methods(http.MethodPost).Path(lockRESTVersionPrefix + lockRESTMethodHealth).HandlerFunc(httpTraceHdrs(lockServer.HealthHandler))
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subrouter.Methods(http.MethodPost).Path(lockRESTVersionPrefix + lockRESTMethodRefresh).HandlerFunc(httpTraceHdrs(lockServer.RefreshHandler))
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subrouter.Methods(http.MethodPost).Path(lockRESTVersionPrefix + lockRESTMethodLock).HandlerFunc(httpTraceHdrs(lockServer.LockHandler))
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subrouter.Methods(http.MethodPost).Path(lockRESTVersionPrefix + lockRESTMethodRLock).HandlerFunc(httpTraceHdrs(lockServer.RLockHandler))
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subrouter.Methods(http.MethodPost).Path(lockRESTVersionPrefix + lockRESTMethodUnlock).HandlerFunc(httpTraceHdrs(lockServer.UnlockHandler))
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subrouter.Methods(http.MethodPost).Path(lockRESTVersionPrefix + lockRESTMethodRUnlock).HandlerFunc(httpTraceHdrs(lockServer.RUnlockHandler))
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subrouter.Methods(http.MethodPost).Path(lockRESTVersionPrefix + lockRESTMethodForceUnlock).HandlerFunc(httpTraceAll(lockServer.ForceUnlockHandler))
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globalLockServer = lockServer.ll
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go lockMaintenance(GlobalContext)
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}
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