2019-04-18 08:16:27 +02:00
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/*
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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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"context"
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"crypto/tls"
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"errors"
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"io"
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"sync"
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"time"
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"net/url"
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2019-06-29 07:09:17 +02:00
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"github.com/minio/dsync/v2"
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2019-04-18 08:16:27 +02:00
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"github.com/minio/minio/cmd/http"
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"github.com/minio/minio/cmd/logger"
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"github.com/minio/minio/cmd/rest"
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xnet "github.com/minio/minio/pkg/net"
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)
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// lockRESTClient is authenticable lock REST client
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type lockRESTClient struct {
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lockSync sync.RWMutex
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host *xnet.Host
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restClient *rest.Client
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serverURL *url.URL
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connected bool
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timer *time.Timer
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}
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2019-08-29 01:12:57 +02:00
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func toLockError(err error) error {
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if err == nil {
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return nil
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}
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switch err.Error() {
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case errLockConflict.Error():
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return errLockConflict
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case errLockNotExpired.Error():
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return errLockNotExpired
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}
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return err
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}
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2019-04-18 08:16:27 +02:00
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// ServerAddr - dsync.NetLocker interface compatible method.
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func (client *lockRESTClient) ServerAddr() string {
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return client.serverURL.Host
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}
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// ServiceEndpoint - dsync.NetLocker interface compatible method.
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func (client *lockRESTClient) ServiceEndpoint() string {
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return client.serverURL.Path
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}
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// check if the host is up or if it is fine
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// to make a call to the lock rest server.
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func (client *lockRESTClient) isHostUp() bool {
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client.lockSync.Lock()
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defer client.lockSync.Unlock()
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if client.connected {
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return true
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}
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select {
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case <-client.timer.C:
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client.connected = true
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client.timer = nil
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return true
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default:
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}
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return false
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}
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// Mark the host as down if there is a Network error.
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func (client *lockRESTClient) markHostDown() {
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client.lockSync.Lock()
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defer client.lockSync.Unlock()
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if !client.connected {
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return
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}
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client.connected = false
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client.timer = time.NewTimer(defaultRetryUnit * 5)
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}
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// Wrapper to restClient.Call to handle network errors, in case of network error the connection is marked disconnected
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// permanently. The only way to restore the connection is at the xl-sets layer by xlsets.monitorAndConnectEndpoints()
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// after verifying format.json
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func (client *lockRESTClient) call(method string, values url.Values, body io.Reader, length int64) (respBody io.ReadCloser, err error) {
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if !client.isHostUp() {
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return nil, errors.New("Lock rest server node is down")
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}
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if values == nil {
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values = make(url.Values)
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}
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respBody, err = client.restClient.Call(method, values, body, length)
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if err == nil {
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return respBody, nil
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}
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if isNetworkError(err) {
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client.markHostDown()
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}
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2019-08-29 01:12:57 +02:00
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return nil, toLockError(err)
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2019-04-18 08:16:27 +02:00
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}
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// Stringer provides a canonicalized representation of node.
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func (client *lockRESTClient) String() string {
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return client.host.String()
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}
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// IsOnline - returns whether REST client failed to connect or not.
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func (client *lockRESTClient) IsOnline() bool {
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return client.connected
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}
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// Close - marks the client as closed.
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func (client *lockRESTClient) Close() error {
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client.connected = false
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client.restClient.Close()
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return nil
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}
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// restCall makes a call to the lock REST server.
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func (client *lockRESTClient) restCall(call string, args dsync.LockArgs) (reply bool, err error) {
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2019-08-05 20:45:30 +02:00
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values := url.Values{}
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values.Set(lockRESTUID, args.UID)
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values.Set(lockRESTSource, args.Source)
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values.Set(lockRESTResource, args.Resource)
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values.Set(lockRESTServerAddr, args.ServerAddr)
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values.Set(lockRESTServerEndpoint, args.ServiceEndpoint)
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respBody, err := client.call(call, values, nil, -1)
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2019-04-18 08:16:27 +02:00
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defer http.DrainBody(respBody)
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2019-08-29 01:12:57 +02:00
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switch err {
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case nil:
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return true, nil
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case errLockConflict, errLockNotExpired:
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return false, nil
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default:
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return false, err
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}
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2019-04-18 08:16:27 +02:00
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}
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// RLock calls read lock REST API.
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func (client *lockRESTClient) RLock(args dsync.LockArgs) (reply bool, err error) {
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return client.restCall(lockRESTMethodRLock, args)
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}
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// Lock calls lock REST API.
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func (client *lockRESTClient) Lock(args dsync.LockArgs) (reply bool, err error) {
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return client.restCall(lockRESTMethodLock, args)
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}
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// RUnlock calls read unlock REST API.
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func (client *lockRESTClient) RUnlock(args dsync.LockArgs) (reply bool, err error) {
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return client.restCall(lockRESTMethodRUnlock, args)
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}
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// Unlock calls write unlock RPC.
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func (client *lockRESTClient) Unlock(args dsync.LockArgs) (reply bool, err error) {
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return client.restCall(lockRESTMethodUnlock, args)
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}
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// ForceUnlock calls force unlock RPC.
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func (client *lockRESTClient) ForceUnlock(args dsync.LockArgs) (reply bool, err error) {
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return client.restCall(lockRESTMethodForceUnlock, args)
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}
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// Expired calls expired RPC.
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func (client *lockRESTClient) Expired(args dsync.LockArgs) (reply bool, err error) {
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return client.restCall(lockRESTMethodExpired, args)
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}
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// Returns a lock rest client.
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func newlockRESTClient(peer *xnet.Host) *lockRESTClient {
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scheme := "http"
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if globalIsSSL {
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scheme = "https"
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}
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serverURL := &url.URL{
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Scheme: scheme,
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Host: peer.String(),
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Path: lockRESTPath,
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}
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var tlsConfig *tls.Config
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if globalIsSSL {
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tlsConfig = &tls.Config{
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ServerName: peer.Name,
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RootCAs: globalRootCAs,
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NextProtos: []string{"http/1.1"}, // Force http1.1
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}
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}
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restClient, err := rest.NewClient(serverURL, tlsConfig, rest.DefaultRESTTimeout, newAuthToken)
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if err != nil {
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logger.LogIf(context.Background(), err)
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return &lockRESTClient{serverURL: serverURL, host: peer, restClient: restClient, connected: false, timer: time.NewTimer(defaultRetryUnit * 5)}
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}
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return &lockRESTClient{serverURL: serverURL, host: peer, restClient: restClient, connected: true}
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}
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