forked from cloudfoundry/guardian
-
Notifications
You must be signed in to change notification settings - Fork 1
/
image_plugin.go
181 lines (150 loc) · 5.69 KB
/
image_plugin.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
package imageplugin
import (
"bytes"
"encoding/json"
"errors"
"fmt"
"net/url"
"os/exec"
"strings"
"code.cloudfoundry.org/commandrunner"
"code.cloudfoundry.org/garden"
"code.cloudfoundry.org/guardian/gardener"
"code.cloudfoundry.org/lager"
specs "github.com/opencontainers/runtime-spec/specs-go"
errorwrapper "github.com/pkg/errors"
"github.com/tscolari/lagregator"
)
const PreloadedPlusLayerScheme = "preloaded+layer"
//go:generate counterfeiter . CommandCreator
type CommandCreator interface {
CreateCommand(log lager.Logger, handle string, spec gardener.RootfsSpec) (*exec.Cmd, error)
DestroyCommand(log lager.Logger, handle string) *exec.Cmd
MetricsCommand(log lager.Logger, handle string) *exec.Cmd
}
//go:generate counterfeiter . ImageSpecCreator
type ImageSpecCreator interface {
CreateImageSpec(rootFS *url.URL, handle string) (*url.URL, error)
}
type ImagePlugin struct {
UnprivilegedCommandCreator CommandCreator
PrivilegedCommandCreator CommandCreator
ImageSpecCreator ImageSpecCreator
CommandRunner commandrunner.CommandRunner
DefaultRootfs string
}
func (p *ImagePlugin) Create(log lager.Logger, handle string, spec gardener.RootfsSpec) (specs.Spec, error) {
errs := func(err error, action string) (specs.Spec, error) {
return specs.Spec{}, errorwrapper.Wrap(err, action)
}
log = log.Session("image-plugin-create", lager.Data{"handle": handle, "spec": spec})
log.Debug("start")
defer log.Debug("end")
if spec.RootFS.String() == "" {
var err error
spec.RootFS, err = url.Parse(p.DefaultRootfs)
if err != nil {
log.Error("parsing-default-rootfs-failed", err)
return errs(err, "parsing default rootfs")
}
}
if strings.HasPrefix(spec.RootFS.String(), fmt.Sprintf("%s:", PreloadedPlusLayerScheme)) {
var err error
spec.RootFS, err = p.ImageSpecCreator.CreateImageSpec(spec.RootFS, handle)
if err != nil {
log.Error("creating-image-spec", err)
return errs(err, "creating image spec")
}
}
var (
createCmd *exec.Cmd
err error
)
if spec.Namespaced {
createCmd, err = p.UnprivilegedCommandCreator.CreateCommand(log, handle, spec)
} else {
createCmd, err = p.PrivilegedCommandCreator.CreateCommand(log, handle, spec)
}
if err != nil {
return errs(err, "creating create command")
}
stdoutBuffer := bytes.NewBuffer([]byte{})
createCmd.Stdout = stdoutBuffer
createCmd.Stderr = lagregator.NewRelogger(log)
if err := p.CommandRunner.Run(createCmd); err != nil {
logData := lager.Data{"action": "create", "stdout": stdoutBuffer.String()}
log.Error("image-plugin-result", err, logData)
return errs(err, fmt.Sprintf("running image plugin create: %s", stdoutBuffer.String()))
}
var runtimeSpec specs.Spec
if err := json.Unmarshal(stdoutBuffer.Bytes(), &runtimeSpec); err != nil {
logData := lager.Data{"action": "create", "stdout": stdoutBuffer.String()}
log.Error("image-plugin-parsing", err, logData)
return errs(err, fmt.Sprintf("parsing image plugin create: %s", stdoutBuffer.String()))
}
// Allow spec.Process.Env to be accessed without nil checks everywhere
if runtimeSpec.Process == nil {
runtimeSpec.Process = &specs.Process{}
}
// Allow spec.Root.Path to be accessed without nil checks everywhere
if runtimeSpec.Root == nil {
runtimeSpec.Root = &specs.Root{}
}
return runtimeSpec, nil
}
func (p *ImagePlugin) Destroy(log lager.Logger, handle string) error {
log = log.Session("image-plugin-destroy", lager.Data{"handle": handle})
log.Debug("start")
defer log.Debug("end")
var destroyCmds []*exec.Cmd
destroyCmds = append(destroyCmds, p.UnprivilegedCommandCreator.DestroyCommand(log, handle))
destroyCmds = append(destroyCmds, p.PrivilegedCommandCreator.DestroyCommand(log, handle))
for _, destroyCmd := range destroyCmds {
if destroyCmd == nil {
continue
}
stdoutBuffer := bytes.NewBuffer([]byte{})
destroyCmd.Stdout = stdoutBuffer
destroyCmd.Stderr = lagregator.NewRelogger(log)
if err := p.CommandRunner.Run(destroyCmd); err != nil {
logData := lager.Data{"action": "destroy", "stdout": stdoutBuffer.String()}
log.Error("image-plugin-result", err, logData)
return errorwrapper.Wrapf(err, "running image plugin destroy: %s", stdoutBuffer.String())
}
}
return nil
}
func (p *ImagePlugin) Metrics(log lager.Logger, handle string, namespaced bool) (garden.ContainerDiskStat, error) {
log = log.Session("image-plugin-metrics", lager.Data{"handle": handle, "namespaced": namespaced})
log.Debug("start")
defer log.Debug("end")
var metricsCmd *exec.Cmd
if namespaced {
metricsCmd = p.UnprivilegedCommandCreator.MetricsCommand(log, handle)
} else {
metricsCmd = p.PrivilegedCommandCreator.MetricsCommand(log, handle)
}
if metricsCmd == nil {
return garden.ContainerDiskStat{}, errors.New("requested image plugin not available")
}
stdoutBuffer := bytes.NewBuffer([]byte{})
metricsCmd.Stdout = stdoutBuffer
metricsCmd.Stderr = lagregator.NewRelogger(log)
if err := p.CommandRunner.Run(metricsCmd); err != nil {
logData := lager.Data{"action": "metrics", "stdout": stdoutBuffer.String()}
log.Error("image-plugin-result", err, logData)
return garden.ContainerDiskStat{}, errorwrapper.Wrapf(err, "running image plugin metrics: %s", stdoutBuffer.String())
}
var diskStat map[string]map[string]uint64
var consumableBuffer = bytes.NewBuffer(stdoutBuffer.Bytes())
if err := json.NewDecoder(consumableBuffer).Decode(&diskStat); err != nil {
return garden.ContainerDiskStat{}, errorwrapper.Wrapf(err, "parsing stats: %s", stdoutBuffer.String())
}
return garden.ContainerDiskStat{
TotalBytesUsed: diskStat["disk_usage"]["total_bytes_used"],
ExclusiveBytesUsed: diskStat["disk_usage"]["exclusive_bytes_used"],
}, nil
}
func (p *ImagePlugin) GC(log lager.Logger) error {
return nil
}