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http.go
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http.go
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// Copyright 2016 The etcd-operator Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package backup
import (
"encoding/json"
"fmt"
"io"
"net/http"
"os"
"strconv"
"time"
"github.com/coreos/etcd-operator/pkg/backup/backupapi"
"github.com/Sirupsen/logrus"
)
const (
HTTPHeaderEtcdVersion = "X-etcd-Version"
HTTPHeaderRevision = "X-Revision"
)
func (b *Backup) startHTTP() {
http.HandleFunc(backupapi.APIV1+"/backup", b.serveSnap)
http.HandleFunc(backupapi.APIV1+"/backupnow", b.serveBackupNow)
http.HandleFunc(backupapi.APIV1+"/status", b.serveStatus)
logrus.Infof("listening on %v", b.listenAddr)
panic(http.ListenAndServe(b.listenAddr, nil))
}
type backupNowAck struct {
err error
status backupapi.BackupStatus
}
func (b *Backup) serveBackupNow(w http.ResponseWriter, r *http.Request) {
ackchan := make(chan backupNowAck, 1)
select {
case b.backupNow <- ackchan:
case <-time.After(time.Minute):
http.Error(w, "timeout", http.StatusRequestTimeout)
return
}
select {
case ack := <-ackchan:
if ack.err != nil {
http.Error(w, ack.err.Error(), http.StatusInternalServerError)
return
}
e := json.NewEncoder(w)
err := e.Encode(ack.status)
if err != nil {
logrus.Errorf("failed to write backup status: %v", err)
}
case <-time.After(10 * time.Minute):
http.Error(w, "timeout", http.StatusRequestTimeout)
return
}
}
func (b *Backup) serveSnap(w http.ResponseWriter, r *http.Request) {
var (
fname string
err error
)
revision := r.FormValue(backupapi.HTTPQueryRevisionKey)
version := r.FormValue(backupapi.HTTPQueryVersionKey)
switch {
case len(revision) != 0 && len(version) != 0:
revisioni, err := strconv.ParseInt(revision, 10, 64)
if err != nil {
http.Error(w, "revision is not a vaild integer", http.StatusBadRequest)
return
}
fname = makeBackupName(version, revisioni)
case len(revision) == 0:
fname, err = b.be.getLatest()
if err != nil {
logrus.Errorf("fail to serve backup: %v", err)
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
if len(fname) == 0 {
http.NotFound(w, r)
return
}
default:
http.Error(w, "version must be provided when revision is provided.", http.StatusBadRequest)
return
}
rc, err := b.be.open(fname)
if err != nil {
if os.IsNotExist(err) {
http.Error(w, "backup not found", http.StatusNotFound)
return
}
logrus.Errorf("fail to open backup (%s): %v", fname, err)
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
defer rc.Close()
serV, err := getMajorMinorVersionFromBackup(fname)
if err != nil {
http.Error(w, fmt.Sprintf("fail to parse etcd version from file (%s): %v", fname, err), http.StatusInternalServerError)
return
}
// If version param is empty, we don't need to check compatibility.
// This could happen if user manually requests it.
if len(version) != 0 {
reqV, err := getMajorAndMinorVersion(version)
if err != nil {
http.Error(w, fmt.Sprintf("invalid param 'version' (%s): %v", version, err), http.StatusBadRequest)
return
}
if !isVersionCompatible(reqV, serV) {
http.Error(w, fmt.Sprintf("requested version (%s) is not compatible with the backup (%s)", reqV, serV), http.StatusBadRequest)
return
}
}
w.Header().Set(HTTPHeaderEtcdVersion, getVersionFromBackup(fname))
rev, err := getRev(fname)
if err != nil {
panic("unexpected error:" + err.Error()) // fname should have already been verified
}
w.Header().Set(HTTPHeaderRevision, strconv.FormatInt(rev, 10))
if r.Method == http.MethodHead {
return
}
_, err = io.Copy(w, rc)
if err != nil {
logrus.Errorf("failed to write backup to %s: %v", r.RemoteAddr, err)
}
}
func (b *Backup) serveStatus(w http.ResponseWriter, r *http.Request) {
t, err := b.be.total()
if err != nil {
http.Error(w, "failed to get total number of backups", http.StatusInternalServerError)
return
}
ts, err := b.be.totalSize()
if err != nil {
http.Error(w, "failed to get total size of backups", http.StatusInternalServerError)
return
}
s := backupapi.ServiceStatus{
Backups: t,
BackupSize: toMB(ts),
}
if len(b.recentBackupsStatus) != 0 {
s.RecentBackup = &b.recentBackupsStatus[len(b.recentBackupsStatus)-1]
}
je := json.NewEncoder(w)
if err := je.Encode(&s); err != nil {
logrus.Errorf("failed to write service status to %s: %v", r.RemoteAddr, err)
}
}