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152 lines
4.4 KiB
152 lines
4.4 KiB
/*
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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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"errors"
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"net/http"
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"path"
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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 check interval.
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lockValidityCheckInterval = 2 * time.Minute
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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 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) dsync.LockArgs {
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return dsync.LockArgs{
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UID: r.URL.Query().Get(lockRESTUID),
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Source: r.URL.Query().Get(lockRESTSource),
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Resource: r.URL.Query().Get(lockRESTResource),
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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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success, err := l.ll.Lock(getLockArgs(r))
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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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_, err := l.ll.Unlock(getLockArgs(r))
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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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success, err := l.ll.RLock(getLockArgs(r))
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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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// 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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_, err := l.ll.RUnlock(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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}
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// registerLockRESTHandlers - register lock rest router.
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func registerLockRESTHandlers(router *mux.Router, endpointZones EndpointZones) {
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queries := restQueries(lockRESTUID, lockRESTSource, lockRESTResource)
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for _, ep := range endpointZones {
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for _, endpoint := range ep.Endpoints {
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if !endpoint.IsLocal {
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continue
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}
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lockServer := &lockRESTServer{
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ll: newLocker(endpoint),
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}
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subrouter := router.PathPrefix(path.Join(lockRESTPrefix, endpoint.Path)).Subrouter()
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subrouter.Methods(http.MethodPost).Path(lockRESTVersionPrefix + lockRESTMethodLock).HandlerFunc(httpTraceHdrs(lockServer.LockHandler)).Queries(queries...)
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subrouter.Methods(http.MethodPost).Path(lockRESTVersionPrefix + lockRESTMethodRLock).HandlerFunc(httpTraceHdrs(lockServer.RLockHandler)).Queries(queries...)
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subrouter.Methods(http.MethodPost).Path(lockRESTVersionPrefix + lockRESTMethodUnlock).HandlerFunc(httpTraceHdrs(lockServer.UnlockHandler)).Queries(queries...)
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subrouter.Methods(http.MethodPost).Path(lockRESTVersionPrefix + lockRESTMethodRUnlock).HandlerFunc(httpTraceHdrs(lockServer.RUnlockHandler)).Queries(queries...)
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globalLockServers[endpoint] = lockServer.ll
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}
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}
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}
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