forked from containerd/containerd
/
snapshot.go
229 lines (209 loc) · 5.59 KB
/
snapshot.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
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
package containerd
import (
"context"
"io"
snapshotapi "github.com/containerd/containerd/api/services/snapshot/v1"
"github.com/containerd/containerd/api/types"
"github.com/containerd/containerd/errdefs"
"github.com/containerd/containerd/mount"
"github.com/containerd/containerd/snapshot"
protobuftypes "github.com/gogo/protobuf/types"
)
// NewSnapshotterFromClient returns a new Snapshotter which communicates
// over a GRPC connection.
func NewSnapshotterFromClient(client snapshotapi.SnapshotsClient, snapshotterName string) snapshot.Snapshotter {
return &remoteSnapshotter{
client: client,
snapshotterName: snapshotterName,
}
}
type remoteSnapshotter struct {
client snapshotapi.SnapshotsClient
snapshotterName string
}
func (r *remoteSnapshotter) Stat(ctx context.Context, key string) (snapshot.Info, error) {
resp, err := r.client.Stat(ctx,
&snapshotapi.StatSnapshotRequest{
Snapshotter: r.snapshotterName,
Key: key,
})
if err != nil {
return snapshot.Info{}, errdefs.FromGRPC(err)
}
return toInfo(resp.Info), nil
}
func (r *remoteSnapshotter) Update(ctx context.Context, info snapshot.Info, fieldpaths ...string) (snapshot.Info, error) {
resp, err := r.client.Update(ctx,
&snapshotapi.UpdateSnapshotRequest{
Snapshotter: r.snapshotterName,
Info: fromInfo(info),
UpdateMask: &protobuftypes.FieldMask{
Paths: fieldpaths,
},
})
if err != nil {
return snapshot.Info{}, errdefs.FromGRPC(err)
}
return toInfo(resp.Info), nil
}
func (r *remoteSnapshotter) Usage(ctx context.Context, key string) (snapshot.Usage, error) {
resp, err := r.client.Usage(ctx, &snapshotapi.UsageRequest{
Snapshotter: r.snapshotterName,
Key: key,
})
if err != nil {
return snapshot.Usage{}, errdefs.FromGRPC(err)
}
return toUsage(resp), nil
}
func (r *remoteSnapshotter) Mounts(ctx context.Context, key string) ([]mount.Mount, error) {
resp, err := r.client.Mounts(ctx, &snapshotapi.MountsRequest{
Snapshotter: r.snapshotterName,
Key: key,
})
if err != nil {
return nil, errdefs.FromGRPC(err)
}
return toMounts(resp.Mounts), nil
}
func (r *remoteSnapshotter) Prepare(ctx context.Context, key, parent string, opts ...snapshot.Opt) ([]mount.Mount, error) {
var local snapshot.Info
for _, opt := range opts {
if err := opt(&local); err != nil {
return nil, err
}
}
resp, err := r.client.Prepare(ctx, &snapshotapi.PrepareSnapshotRequest{
Snapshotter: r.snapshotterName,
Key: key,
Parent: parent,
Labels: local.Labels,
})
if err != nil {
return nil, errdefs.FromGRPC(err)
}
return toMounts(resp.Mounts), nil
}
func (r *remoteSnapshotter) View(ctx context.Context, key, parent string, opts ...snapshot.Opt) ([]mount.Mount, error) {
var local snapshot.Info
for _, opt := range opts {
if err := opt(&local); err != nil {
return nil, err
}
}
resp, err := r.client.View(ctx, &snapshotapi.ViewSnapshotRequest{
Snapshotter: r.snapshotterName,
Key: key,
Parent: parent,
Labels: local.Labels,
})
if err != nil {
return nil, errdefs.FromGRPC(err)
}
return toMounts(resp.Mounts), nil
}
func (r *remoteSnapshotter) Commit(ctx context.Context, name, key string, opts ...snapshot.Opt) error {
var local snapshot.Info
for _, opt := range opts {
if err := opt(&local); err != nil {
return err
}
}
_, err := r.client.Commit(ctx, &snapshotapi.CommitSnapshotRequest{
Snapshotter: r.snapshotterName,
Name: name,
Key: key,
Labels: local.Labels,
})
return errdefs.FromGRPC(err)
}
func (r *remoteSnapshotter) Remove(ctx context.Context, key string) error {
_, err := r.client.Remove(ctx, &snapshotapi.RemoveSnapshotRequest{
Snapshotter: r.snapshotterName,
Key: key,
})
return errdefs.FromGRPC(err)
}
func (r *remoteSnapshotter) Walk(ctx context.Context, fn func(context.Context, snapshot.Info) error) error {
sc, err := r.client.List(ctx, &snapshotapi.ListSnapshotsRequest{
Snapshotter: r.snapshotterName,
})
if err != nil {
return errdefs.FromGRPC(err)
}
for {
resp, err := sc.Recv()
if err != nil {
if err == io.EOF {
return nil
}
return errdefs.FromGRPC(err)
}
if resp == nil {
return nil
}
for _, info := range resp.Info {
if err := fn(ctx, toInfo(info)); err != nil {
return err
}
}
}
}
func (r *remoteSnapshotter) Close() error {
return nil
}
func toKind(kind snapshotapi.Kind) snapshot.Kind {
if kind == snapshotapi.KindActive {
return snapshot.KindActive
}
if kind == snapshotapi.KindView {
return snapshot.KindView
}
return snapshot.KindCommitted
}
func toInfo(info snapshotapi.Info) snapshot.Info {
return snapshot.Info{
Name: info.Name,
Parent: info.Parent,
Kind: toKind(info.Kind),
Created: info.CreatedAt,
Updated: info.UpdatedAt,
Labels: info.Labels,
}
}
func toUsage(resp *snapshotapi.UsageResponse) snapshot.Usage {
return snapshot.Usage{
Inodes: resp.Inodes,
Size: resp.Size_,
}
}
func toMounts(mm []*types.Mount) []mount.Mount {
mounts := make([]mount.Mount, len(mm))
for i, m := range mm {
mounts[i] = mount.Mount{
Type: m.Type,
Source: m.Source,
Options: m.Options,
}
}
return mounts
}
func fromKind(kind snapshot.Kind) snapshotapi.Kind {
if kind == snapshot.KindActive {
return snapshotapi.KindActive
}
if kind == snapshot.KindView {
return snapshotapi.KindView
}
return snapshotapi.KindCommitted
}
func fromInfo(info snapshot.Info) snapshotapi.Info {
return snapshotapi.Info{
Name: info.Name,
Parent: info.Parent,
Kind: fromKind(info.Kind),
CreatedAt: info.Created,
UpdatedAt: info.Updated,
Labels: info.Labels,
}
}