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d9db7f3308
lockers currently might leave stale lockers, in unknown ways waiting for downed lockers. locker check interval is high enough to safely cleanup stale locks.
105 lines
3.2 KiB
Go
105 lines
3.2 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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*/
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package madmin
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import (
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"context"
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"encoding/json"
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"io/ioutil"
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"net/http"
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"net/url"
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"strconv"
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"time"
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)
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// LockEntry holds information about client requesting the lock,
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// servers holding the lock, source on the client machine,
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// ID, type(read or write) and time stamp.
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type LockEntry struct {
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Timestamp time.Time `json:"time"` // When the lock was first granted
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Resource string `json:"resource"` // Resource contains info like bucket+object
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Type string `json:"type"` // Type indicates if 'Write' or 'Read' lock
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Source string `json:"source"` // Source at which lock was granted
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ServerList []string `json:"serverlist"` // List of servers participating in the lock.
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Owner string `json:"owner"` // Owner UUID indicates server owns the lock.
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ID string `json:"id"` // UID to uniquely identify request of client.
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// Represents quorum number of servers required to hold this lock, used to look for stale locks.
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Quorum int `json:"quorum"`
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}
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// LockEntries - To sort the locks
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type LockEntries []LockEntry
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func (l LockEntries) Len() int {
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return len(l)
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}
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func (l LockEntries) Less(i, j int) bool {
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return l[i].Timestamp.Before(l[j].Timestamp)
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}
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func (l LockEntries) Swap(i, j int) {
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l[i], l[j] = l[j], l[i]
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}
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// TopLockOpts top lock options
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type TopLockOpts struct {
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Count int
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Stale bool
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}
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// TopLocksWithOpts - returns the count number of oldest locks currently active on the server.
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// additionally we can also enable `stale` to get stale locks currently present on server.
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func (adm *AdminClient) TopLocksWithOpts(ctx context.Context, opts TopLockOpts) (LockEntries, error) {
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// Execute GET on /minio/admin/v3/top/locks?count=10
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// to get the 'count' number of oldest locks currently
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// active on the server.
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queryVals := make(url.Values)
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queryVals.Set("count", strconv.Itoa(opts.Count))
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queryVals.Set("stale", strconv.FormatBool(opts.Stale))
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resp, err := adm.executeMethod(ctx,
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http.MethodGet,
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requestData{
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relPath: adminAPIPrefix + "/top/locks",
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queryValues: queryVals,
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},
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)
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defer closeResponse(resp)
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if err != nil {
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return nil, err
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}
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if resp.StatusCode != http.StatusOK {
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return nil, httpRespToErrorResponse(resp)
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}
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response, err := ioutil.ReadAll(resp.Body)
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if err != nil {
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return LockEntries{}, err
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}
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var lockEntries LockEntries
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err = json.Unmarshal(response, &lockEntries)
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return lockEntries, err
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}
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// TopLocks - returns top '10' oldest locks currently active on the server.
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func (adm *AdminClient) TopLocks(ctx context.Context) (LockEntries, error) {
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return adm.TopLocksWithOpts(ctx, TopLockOpts{Count: 10})
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}
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