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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2019-10-09 08:11:15 +02:00
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"sync/atomic"
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2019-04-18 08:16:27 +02:00
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"time"
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"net/url"
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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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2019-11-13 21:17:45 +01:00
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"github.com/minio/minio/pkg/dsync"
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2019-04-18 08:16:27 +02:00
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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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restClient *rest.Client
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endpoint Endpoint
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connected int32
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2019-04-18 08:16:27 +02:00
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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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2019-11-26 01:39:43 +01:00
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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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2019-11-13 21:17:45 +01:00
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// String stringer *dsync.NetLocker* interface compatible method.
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func (client *lockRESTClient) String() string {
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return client.endpoint.String()
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2019-04-18 08:16:27 +02:00
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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.IsOnline() {
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2019-04-18 08:16:27 +02:00
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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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time.AfterFunc(defaultRetryUnit*3, func() {
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// After 3 seconds, take this lock client online for a retry.
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atomic.StoreInt32(&client.connected, 1)
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})
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2019-10-09 08:11:15 +02:00
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atomic.StoreInt32(&client.connected, 0)
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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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}
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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 atomic.LoadInt32(&client.connected) == 1
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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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atomic.StoreInt32(&client.connected, 0)
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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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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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respBody, err := client.call(call, values, nil, -1)
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defer http.DrainBody(respBody)
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switch err {
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case nil:
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return true, nil
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2019-11-26 01:39:43 +01:00
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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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}
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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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2019-11-26 01:39:43 +01:00
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// Expired calls expired handler to check if lock args have expired.
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func (client *lockRESTClient) Expired(args dsync.LockArgs) (expired bool, err error) {
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return client.restCall(lockRESTMethodExpired, args)
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}
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2019-11-13 21:17:45 +01:00
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func closeLockers(lockers []dsync.NetLocker) {
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for _, locker := range lockers {
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locker.Close()
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}
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}
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2019-11-13 21:17:45 +01:00
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func newLockAPI(endpoint Endpoint) dsync.NetLocker {
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if endpoint.IsLocal {
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return globalLockServers[endpoint]
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}
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return newlockRESTClient(endpoint)
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}
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// Returns a lock rest client.
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func newlockRESTClient(endpoint Endpoint) *lockRESTClient {
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serverURL := &url.URL{
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Scheme: endpoint.Scheme,
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Host: endpoint.Host,
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Path: pathJoin(lockRESTPrefix, endpoint.Path, lockRESTVersion),
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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: endpoint.Hostname(),
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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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2019-11-13 21:17:45 +01:00
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trFn := newCustomHTTPTransport(tlsConfig, rest.DefaultRESTTimeout, rest.DefaultRESTTimeout)
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restClient, err := rest.NewClient(serverURL, trFn, newAuthToken)
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if err != nil {
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logger.LogIf(context.Background(), err)
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2019-11-13 21:17:45 +01:00
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return &lockRESTClient{endpoint: endpoint, restClient: restClient, connected: 0}
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2019-04-18 08:16:27 +02:00
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}
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2019-11-13 21:17:45 +01:00
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return &lockRESTClient{endpoint: endpoint, restClient: restClient, connected: 1}
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2019-04-18 08:16:27 +02:00
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}
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