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/
remote.go
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/
remote.go
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// Copyright 2014 The rkt 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 store implements a content-addressable-store on disk.
// It leverages the `diskv` package to store items in a simple
// key-value blob store: https://github.com/peterbourgon/diskv
package imagestore
import (
"database/sql"
"errors"
"time"
)
var (
ErrRemoteNotFound = errors.New("remote target not found")
)
func NewRemote(aciurl, sigurl string) *Remote {
r := &Remote{
ACIURL: aciurl,
SigURL: sigurl,
}
return r
}
type Remote struct {
// ACIURL is the URL used to import an ACI.
ACIURL string
// SigURL is the URL used to import an ACI verification signature.
SigURL string
ETag string
// The key in the blob store under which the ACI has been saved.
BlobKey string
CacheMaxAge int
DownloadTime time.Time
}
func remoteRowScan(rows *sql.Rows, remote *Remote) error {
return rows.Scan(&remote.ACIURL, &remote.SigURL, &remote.ETag, &remote.BlobKey, &remote.CacheMaxAge, &remote.DownloadTime)
}
// GetRemote tries to retrieve a remote with the given aciURL.
// If remote doesn't exist, it returns ErrRemoteNotFound error.
func GetRemote(tx *sql.Tx, aciURL string) (*Remote, error) {
rows, err := tx.Query("SELECT * FROM remote WHERE aciurl == $1", aciURL)
if err != nil {
return nil, err
}
defer rows.Close()
if ok := rows.Next(); !ok {
return nil, ErrRemoteNotFound
}
remote := &Remote{}
if err := remoteRowScan(rows, remote); err != nil {
return nil, err
}
if err := rows.Err(); err != nil {
return nil, err
}
return remote, nil
}
// GetAllRemotes returns all the ACIInfos sorted by optional sortfields and
// with ascending or descending order.
func GetAllRemotes(tx *sql.Tx) ([]*Remote, error) {
var remotes []*Remote
query := "SELECT * from remote"
rows, err := tx.Query(query)
if err != nil {
return nil, err
}
defer rows.Close()
for rows.Next() {
r := &Remote{}
if err := remoteRowScan(rows, r); err != nil {
return nil, err
}
remotes = append(remotes, r)
}
if err := rows.Err(); err != nil {
return nil, err
}
return remotes, nil
}
// WriteRemote adds or updates the provided Remote.
func WriteRemote(tx *sql.Tx, remote *Remote) error {
// ql doesn't have an INSERT OR UPDATE function so
// it's faster to remove and reinsert the row
_, err := tx.Exec("DELETE FROM remote WHERE aciurl == $1", remote.ACIURL)
if err != nil {
return err
}
_, err = tx.Exec("INSERT INTO remote VALUES ($1, $2, $3, $4, $5, $6)", remote.ACIURL, remote.SigURL, remote.ETag, remote.BlobKey, remote.CacheMaxAge, remote.DownloadTime)
if err != nil {
return err
}
return nil
}
// RemoveRemote removes the remote with the given blobKey.
func RemoveRemote(tx *sql.Tx, blobKey string) error {
_, err := tx.Exec("DELETE FROM remote WHERE blobkey == $1", blobKey)
if err != nil {
return err
}
return nil
}