forked from vmware/vic
/
backend.go
75 lines (62 loc) · 2.04 KB
/
backend.go
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// Copyright 2016 VMware, Inc. All Rights Reserved.
//
// 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 kvstore
import (
"context"
"fmt"
"io"
"net/http"
"os"
log "github.com/Sirupsen/logrus"
"github.com/docker/docker/pkg/stringutils"
"github.com/vmware/vic/pkg/vsphere/datastore"
)
type Backend interface {
// Save saves data to the specified path
Save(ctx context.Context, r io.Reader, path string) error
// Load loads data from the specified path
Load(ctx context.Context, path string) (io.ReadCloser, error)
}
func NewDatastoreBackend(ds *datastore.Helper) Backend {
return &dsBackend{ds: ds}
}
type dsBackend struct {
ds *datastore.Helper
}
// Save saves data to the specified path
func (d *dsBackend) Save(ctx context.Context, r io.Reader, path string) error {
// upload to an ephemeral file
tmpfile := fmt.Sprintf("%s-%s.tmp", path, stringutils.GenerateRandomAlphaOnlyString(10))
if err := d.ds.Upload(ctx, r, tmpfile); err != nil {
return err
}
log.Debugf("kv store upload of file (%s) was successful", tmpfile)
return d.ds.Mv(ctx, tmpfile, path)
}
func toOsError(err error) error {
switch err.Error() {
case fmt.Sprintf("%d %s", http.StatusNotFound, http.StatusText(http.StatusNotFound)):
return os.ErrNotExist
}
return err
}
// Load loads data from the specified path
func (d *dsBackend) Load(ctx context.Context, path string) (io.ReadCloser, error) {
rc, err := d.ds.Download(ctx, path)
if err != nil {
return nil, toOsError(err)
}
log.Debugf("kv store download of file (%s) was successful", path)
return rc, err
}