forked from coreos/etcd-operator
/
backup_server.go
129 lines (111 loc) · 3.81 KB
/
backup_server.go
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// Copyright 2017 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 (
"fmt"
"io"
"net/http"
"os"
"strconv"
"github.com/coreos/etcd-operator/pkg/backup/backend"
"github.com/coreos/etcd-operator/pkg/backup/backupapi"
"github.com/coreos/etcd-operator/pkg/backup/util"
"github.com/sirupsen/logrus"
)
// BackupServer provides the http handlers to handle backup related requests.
type BackupServer struct {
backend backend.Backend
}
// NewBackupServer creates a BackupServer.
func NewBackupServer(backend backend.Backend) *BackupServer {
return &BackupServer{backend}
}
// ServeBackup serves the backup request:
// - For GET, it returns the headers of etcd version and revision, with backup data.
// For HEAD, it only returns the headers.
// - It checks compatibility and fails any incompatible backup request
// - If both etcd version and revision, it returns the specified backup.
// If etcd version and revision is not given, it returns the latest compatible backup.
// If etcd version is not given, it returns the latest backup.
func (bs *BackupServer) ServeBackup(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 = util.MakeBackupName(version, revisioni)
case len(revision) == 0:
fname, err = bs.backend.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 := bs.backend.Open(fname)
if err != nil {
// TODO: define backend layer not found error
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 := util.MustParseRevision(fname)
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)
}
}