additionally also add a new ForceUnlock API, to allow forcibly unlocking locks if possible.
176 lines
5.3 KiB
Go
176 lines
5.3 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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"bytes"
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"context"
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"io"
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"net/url"
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"strconv"
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"github.com/minio/minio/cmd/http"
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xhttp "github.com/minio/minio/cmd/http"
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"github.com/minio/minio/cmd/rest"
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"github.com/minio/minio/pkg/dsync"
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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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u *url.URL
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}
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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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// String stringer *dsync.NetLocker* interface compatible method.
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func (client *lockRESTClient) String() string {
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return client.u.String()
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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) callWithContext(ctx context.Context, method string, values url.Values, body io.Reader, length int64) (respBody io.ReadCloser, err error) {
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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(ctx, 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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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 client.restClient.IsOnline()
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}
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// Not a local locker
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func (client *lockRESTClient) IsLocal() bool {
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return false
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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.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(ctx context.Context, 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(lockRESTOwner, args.Owner)
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values.Set(lockRESTSource, args.Source)
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values.Set(lockRESTQuorum, strconv.Itoa(args.Quorum))
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var buffer bytes.Buffer
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for _, resource := range args.Resources {
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buffer.WriteString(resource)
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buffer.WriteString("\n")
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}
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respBody, err := client.callWithContext(ctx, call, values, &buffer, -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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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(ctx context.Context, args dsync.LockArgs) (reply bool, err error) {
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return client.restCall(ctx, lockRESTMethodRLock, args)
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}
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// Lock calls lock REST API.
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func (client *lockRESTClient) Lock(ctx context.Context, args dsync.LockArgs) (reply bool, err error) {
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return client.restCall(ctx, 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(context.Background(), 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(context.Background(), lockRESTMethodUnlock, args)
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}
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// Expired calls expired handler to check if lock args have expired.
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func (client *lockRESTClient) Expired(ctx context.Context, args dsync.LockArgs) (expired bool, err error) {
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return client.restCall(ctx, lockRESTMethodExpired, args)
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}
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// ForceUnlock calls force unlock handler to forcibly unlock an active lock.
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func (client *lockRESTClient) ForceUnlock(ctx context.Context, args dsync.LockArgs) (reply bool, err error) {
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return client.restCall(ctx, lockRESTMethodForceUnlock, args)
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}
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func newLockAPI(endpoint Endpoint) dsync.NetLocker {
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if endpoint.IsLocal {
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return globalLockServer
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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, lockRESTVersion),
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}
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restClient := rest.NewClient(serverURL, globalInternodeTransport, newAuthToken)
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restClient.ExpectTimeouts = true
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// Use a separate client to avoid recursive calls.
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healthClient := rest.NewClient(serverURL, globalInternodeTransport, newAuthToken)
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healthClient.ExpectTimeouts = true
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restClient.HealthCheckFn = func() bool {
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ctx, cancel := context.WithTimeout(GlobalContext, restClient.HealthCheckTimeout)
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defer cancel()
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respBody, err := healthClient.Call(ctx, lockRESTMethodHealth, nil, nil, -1)
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xhttp.DrainBody(respBody)
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return !isNetworkError(err)
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}
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return &lockRESTClient{u: &url.URL{
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Scheme: endpoint.Scheme,
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Host: endpoint.Host,
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}, restClient: restClient}
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}
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