/
s3.go
195 lines (162 loc) · 5.05 KB
/
s3.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
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
// Copyright 2017 Quentin Machu & eco 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 s3
import (
"errors"
"fmt"
"io"
"io/ioutil"
"os"
"sort"
"time"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/ec2metadata"
"github.com/aws/aws-sdk-go/aws/session"
ss3 "github.com/aws/aws-sdk-go/service/s3"
"github.com/aws/aws-sdk-go/service/s3/s3manager"
log "github.com/sirupsen/logrus"
"github.com/quentin-m/etcd-cloud-operator/pkg/providers"
"github.com/quentin-m/etcd-cloud-operator/pkg/providers/snapshot"
)
func init() {
snapshot.Register("s3", &s3{})
}
type s3 struct {
config config
region string
}
type config struct {
Bucket string `yaml:"bucket"`
}
func (s *s3) Configure(providerConfig snapshot.Config) error {
if err := providers.ParseParams(providerConfig.Params, &s.config); err != nil {
return fmt.Errorf("invalid configuration: %v", err)
}
if s.config.Bucket == "" {
return errors.New("invalid configuration: bucket name is missing")
}
sess, err := session.NewSession()
if err != nil {
return fmt.Errorf("failed to create aws session: %v", err)
}
ec2meta := ec2metadata.New(sess)
if !ec2meta.Available() {
return errors.New("application is not running on aws ec2")
}
s.region, err = ec2meta.Region()
if err != nil {
return fmt.Errorf("failed to retrieve aws ec2 region: %v", err)
}
if _, err := s.Info(); err != nil && err != snapshot.ErrNoSnapshot {
return fmt.Errorf("failed to validate aws s3 configuration: %v", err)
}
return nil
}
func (s *s3) Save(r io.ReadCloser, metadata *snapshot.Metadata) error {
key := metadata.Filename()
sess, err := session.NewSession(aws.NewConfig().WithRegion(s.region))
if err != nil {
return fmt.Errorf("failed to create aws session: %v", err)
}
s3s := ss3.New(sess)
_, err = s3manager.NewUploader(sess).Upload(&s3manager.UploadInput{
Bucket: aws.String(s.config.Bucket),
Key: aws.String(key),
Body: r,
})
if err != nil {
s3s.DeleteObject(&ss3.DeleteObjectInput{})
return fmt.Errorf("failed to upload aws s3 object: %v", err)
}
resp, err := s3s.HeadObject(&ss3.HeadObjectInput{
Bucket: aws.String(s.config.Bucket),
Key: aws.String(key),
})
if err != nil {
log.WithError(err).Warnf("failed to get aws s3 object size for %q")
return nil
}
metadata.Size = *resp.ContentLength
return nil
}
func (s *s3) Get(metadata *snapshot.Metadata) (string, bool, error) {
sess, err := session.NewSession(aws.NewConfig().WithRegion(s.region))
if err != nil {
return "", true, fmt.Errorf("failed to create aws session: %v", err)
}
f, err := ioutil.TempFile("", "")
if err != nil {
return "", true, err
}
if _, err := s3manager.NewDownloader(sess).Download(f, &ss3.GetObjectInput{
Bucket: aws.String(s.config.Bucket),
Key: aws.String(metadata.Name),
}); err != nil {
f.Close()
os.Remove(f.Name())
return "", true, fmt.Errorf("failed to get aws s3 object: %v", err)
}
f.Sync()
f.Close()
return f.Name(), true, nil
}
func (s *s3) Info() (*snapshot.Metadata, error) {
sess, err := session.NewSession(aws.NewConfig().WithRegion(s.region))
if err != nil {
return nil, fmt.Errorf("failed to create aws session: %v", err)
}
s3s := ss3.New(sess)
resp, err := s3s.ListObjects(&ss3.ListObjectsInput{Bucket: aws.String(s.config.Bucket)})
if err != nil {
return nil, fmt.Errorf("failed to list aws s3 objects: %v", err)
}
var metadatas []*snapshot.Metadata
for _, obj := range resp.Contents {
metadata, err := snapshot.NewMetadata(*obj.Key, -1, *obj.Size, s)
if err != nil {
log.Warnf("failed to parse metadata for snapshot %v", *obj.Key)
continue
}
metadatas = append(metadatas, metadata)
}
if len(metadatas) == 0 {
return nil, snapshot.ErrNoSnapshot
}
sort.Sort(snapshot.MetadataSorter(metadatas))
return metadatas[len(metadatas)-1], nil
}
func (s *s3) Purge(ttl time.Duration) error {
sess, err := session.NewSession(aws.NewConfig().WithRegion(s.region))
if err != nil {
return fmt.Errorf("failed to create aws session: %v", err)
}
s3s := ss3.New(sess)
resp, err := s3s.ListObjects(&ss3.ListObjectsInput{Bucket: aws.String(s.config.Bucket)})
if err != nil {
return fmt.Errorf("failed to list aws s3 objects: %v", err)
}
for _, item := range resp.Contents {
if time.Since(*item.LastModified) > ttl {
log.Infof("purging snapshot file %q because it is that older than %v", *item.Key, ttl)
_, err := s3s.DeleteObject(&ss3.DeleteObjectInput{
Bucket: aws.String(s.config.Bucket),
Key: item.Key,
})
if err != nil {
log.WithError(err).Warn("failed to remove aws s3 object")
}
}
}
return nil
}