/
expose.go
142 lines (125 loc) · 4.53 KB
/
expose.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
package cmd
import (
"fmt"
"io"
"github.com/spf13/cobra"
kapi "k8s.io/kubernetes/pkg/api"
kcmd "k8s.io/kubernetes/pkg/kubectl/cmd"
kcmdutil "k8s.io/kubernetes/pkg/kubectl/cmd/util"
"k8s.io/kubernetes/pkg/kubectl/resource"
cmdutil "github.com/openshift/origin/pkg/cmd/util"
"github.com/openshift/origin/pkg/cmd/util/clientcmd"
)
const (
exposeLong = `
Expose containers internally as services or externally via routes
There is also the ability to expose a deployment configuration, replication controller, service, or pod
as a new service on a specified port. If no labels are specified, the new object will re-use the
labels from the object it exposes.`
exposeExample = ` # Create a route based on service nginx. The new route will re-use nginx's labels
%[1]s expose service nginx
# Create a route and specify your own label and route name
%[1]s expose service nginx -l name=myroute --name=fromdowntown
# Create a route and specify a hostname
%[1]s expose service nginx --hostname=www.example.com
# Expose a deployment configuration as a service and use the specified port
%[1]s expose dc ruby-hello-world --port=8080
# Expose a service as a route in the specified path
%[1]s expose service nginx --path=/nginx`
)
// NewCmdExpose is a wrapper for the Kubernetes cli expose command
func NewCmdExpose(fullName string, f *clientcmd.Factory, out io.Writer) *cobra.Command {
cmd := kcmd.NewCmdExposeService(f.Factory, out)
cmd.Short = "Expose a replicated application as a service or route"
cmd.Long = exposeLong
cmd.Example = fmt.Sprintf(exposeExample, fullName)
// Default generator to an empty string so we can get more flexibility
// when setting defaults based on input resources
cmd.Flags().Set("generator", "")
cmd.Flag("generator").Usage = "The name of the API generator to use."
cmd.Flag("generator").DefValue = ""
// Default protocol to an empty string so we can get more flexibility
// when validating the use of it (invalid for routes)
cmd.Flags().Set("protocol", "")
cmd.Flag("protocol").DefValue = ""
cmd.Flag("protocol").Changed = false
cmd.Flag("port").Usage = "The port that the resource should serve on."
defRun := cmd.Run
cmd.Run = func(cmd *cobra.Command, args []string) {
err := validate(cmd, f, args)
kcmdutil.CheckErr(err)
defRun(cmd, args)
}
cmd.Flags().String("hostname", "", "Set a hostname for the new route")
cmd.Flags().String("path", "", "Set a path for the new route")
return cmd
}
// validate adds one layer of validation prior to calling the upstream
// expose command.
func validate(cmd *cobra.Command, f *clientcmd.Factory, args []string) error {
namespace, enforceNamespace, err := f.DefaultNamespace()
if err != nil {
return err
}
_, kc, err := f.Clients()
if err != nil {
return err
}
mapper, typer := f.Object(false)
r := resource.NewBuilder(mapper, typer, resource.ClientMapperFunc(f.ClientForMapping), kapi.Codecs.UniversalDecoder()).
ContinueOnError().
NamespaceParam(namespace).DefaultNamespace().
FilenameParam(enforceNamespace, false, kcmdutil.GetFlagStringSlice(cmd, "filename")...).
ResourceTypeOrNameArgs(false, args...).
Flatten().
Do()
infos, err := r.Infos()
if err != nil {
return err
}
if len(infos) > 1 {
return fmt.Errorf("multiple resources provided: %v", args)
}
info := infos[0]
mapping := info.ResourceMapping()
generator := kcmdutil.GetFlagString(cmd, "generator")
switch mapping.GroupVersionKind.GroupKind() {
case kapi.Kind("Service"):
switch generator {
case "service/v1", "service/v2":
// Set default protocol back for generating services
if len(kcmdutil.GetFlagString(cmd, "protocol")) == 0 {
cmd.Flags().Set("protocol", "TCP")
}
case "":
// Default exposing services as a route
generator = "route/v1"
cmd.Flags().Set("generator", generator)
fallthrough
case "route/v1":
route, err := cmdutil.UnsecuredRoute(kc, namespace, info.Name, info.Name, kcmdutil.GetFlagString(cmd, "port"))
if err != nil {
return err
}
if route.Spec.Port != nil {
cmd.Flags().Set("port", route.Spec.Port.TargetPort.String())
}
}
default:
switch generator {
case "route/v1":
return fmt.Errorf("cannot expose a %s as a route", mapping.GroupVersionKind.Kind)
case "":
// Default exposing everything except services as a service
generator = "service/v2"
cmd.Flags().Set("generator", generator)
fallthrough
case "service/v1", "service/v2":
// Set default protocol back for generating services
if len(kcmdutil.GetFlagString(cmd, "protocol")) == 0 {
cmd.Flags().Set("protocol", "TCP")
}
}
}
return nil
}