/
remote.go
86 lines (78 loc) · 2.49 KB
/
remote.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
// 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 store
import (
"database/sql"
"time"
)
func NewRemote(aciurl, sigurl string) *Remote {
r := &Remote{
ACIURL: aciurl,
SigURL: sigurl,
}
return r
}
type Remote struct {
ACIURL string
SigURL string
ETag string
// The key in the blob store under which the ACI has been saved.
BlobKey string
CacheMaxAge int
DownloadTime time.Time
}
// GetRemote tries to retrieve a remote with the given aciURL. found will be
// false if remote doesn't exist.
func GetRemote(tx *sql.Tx, aciURL string) (remote *Remote, found bool, err error) {
remote = &Remote{}
rows, err := tx.Query("SELECT * FROM remote WHERE aciurl == $1", aciURL)
if err != nil {
return nil, false, err
}
for rows.Next() {
found = true
if err := rows.Scan(&remote.ACIURL, &remote.SigURL, &remote.ETag, &remote.BlobKey, &remote.CacheMaxAge, &remote.DownloadTime); err != nil {
return nil, false, err
}
}
if err := rows.Err(); err != nil {
return nil, false, err
}
return remote, found, err
}
// 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
}