/
converter_test.go
247 lines (219 loc) · 5.42 KB
/
converter_test.go
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package krmfunction
import (
"bytes"
"io/ioutil"
"os"
"os/exec"
"path/filepath"
"testing"
"github.com/stretchr/testify/assert"
)
func makeTempDir(t *testing.T) string {
s, err := ioutil.TempDir("", "pluginator-*")
assert.NoError(t, err)
return s
}
func getTransformerCode() []byte {
// a simple namespace transformer
return []byte(`
package main
import (
"fmt"
"sigs.k8s.io/kustomize/api/resmap"
"sigs.k8s.io/yaml"
"sigs.k8s.io/kustomize/api/filters/namespace"
"sigs.k8s.io/kustomize/kyaml/filtersutil"
"sigs.k8s.io/kustomize/api/types"
)
type plugin struct{
Namespace string ` + "`json:\"namespace,omitempty\" yaml:\"namespace,omitempty\"`" + `
FieldSpecs []types.FieldSpec ` + "`json:\"fieldSpecs,omitempty\" yaml:\"fieldSpecs,omitempty\"`" + `
}
//noinspection GoUnusedGlobalVariable
var KustomizePlugin plugin
func (p *plugin) Config(
_ *resmap.PluginHelpers, config []byte) (err error) {
return yaml.Unmarshal(config, p)
}
func (p *plugin) Transform(rm resmap.ResMap) error {
if len(p.Namespace) == 0 {
return nil
}
for _, r := range rm.Resources() {
if r.IsEmpty() {
// Don't mutate empty objects?
continue
}
err := filtersutil.ApplyToJSON(namespace.Filter{
Namespace: p.Namespace,
FsSlice: p.FieldSpecs,
}, r)
if err != nil {
return err
}
matches := rm.GetMatchingResourcesByCurrentId(r.CurId().Equals)
if len(matches) != 1 {
return fmt.Errorf(
"namespace transformation produces ID conflict: %+v", matches)
}
}
return nil
}
`)
}
func getTransformerInputResource() []byte {
return []byte(`
apiVersion: config.kubernetes.io/v1
kind: ResourceList
functionConfig:
apiVersion: foo-corp.com/v1
kind: FulfillmentCenter
metadata:
name: staging
annotations:
config.kubernetes.io/function: |
container:
image: gcr.io/example/foo:v1.0.0
data:
namespace: foo
fieldSpecs:
- path: metadata/namespace
create: true
items:
- apiVersion: apps/v1
kind: foobar
metadata:
name: whatever
`)
}
func runKrmFunction(t *testing.T, input []byte, dir string) []byte {
cmd := exec.Command("go", "run", ".")
ib := bytes.NewReader(input)
cmd.Stdin = ib
ob := bytes.NewBuffer([]byte{})
cmd.Stdout = ob
eb := bytes.NewBuffer([]byte{})
cmd.Stderr = eb
cmd.Dir = dir
err := cmd.Run()
if !assert.NoErrorf(t, err, "Stdout:\n%s\nStderr:\n%s\n", ob.String(), eb.String()) {
t.FailNow()
}
return ob.Bytes()
}
func TestTransformerConverter(t *testing.T) {
dir := makeTempDir(t)
defer os.RemoveAll(dir)
ioutil.WriteFile(filepath.Join(dir, "Plugin.go"),
getTransformerCode(), 0644)
c := NewConverter(filepath.Join(dir, "output"),
filepath.Join(dir, "Plugin.go"))
err := c.Convert()
assert.NoError(t, err)
output := runKrmFunction(t, getTransformerInputResource(), filepath.Join(dir, "output"))
assert.Equal(t, `apiVersion: config.kubernetes.io/v1
kind: ResourceList
items:
- apiVersion: apps/v1
kind: foobar
metadata:
name: whatever
namespace: foo
functionConfig:
apiVersion: foo-corp.com/v1
kind: FulfillmentCenter
metadata:
name: staging
annotations:
config.kubernetes.io/function: |
container:
image: gcr.io/example/foo:v1.0.0
data:
namespace: foo
fieldSpecs:
- path: metadata/namespace
create: true
`, string(output))
}
func getGeneratorCode() []byte {
return []byte(`package main
import (
"sigs.k8s.io/kustomize/api/kv"
"sigs.k8s.io/kustomize/api/resmap"
"sigs.k8s.io/kustomize/api/types"
"sigs.k8s.io/yaml"
)
type plugin struct {
h *resmap.PluginHelpers
types.ObjectMeta ` + "`json:\"metadata,omitempty\" yaml:\"metadata,omitempty\"`" + `
types.ConfigMapArgs
}
//noinspection GoUnusedGlobalVariable
var KustomizePlugin plugin
func (p *plugin) Config(h *resmap.PluginHelpers, config []byte) (err error) {
p.ConfigMapArgs = types.ConfigMapArgs{}
err = yaml.Unmarshal(config, p)
if p.ConfigMapArgs.Name == "" {
p.ConfigMapArgs.Name = p.Name
}
if p.ConfigMapArgs.Namespace == "" {
p.ConfigMapArgs.Namespace = p.Namespace
}
p.h = h
return
}
func (p *plugin) Generate() (resmap.ResMap, error) {
return p.h.ResmapFactory().FromConfigMapArgs(
kv.NewLoader(p.h.Loader(), p.h.Validator()), p.ConfigMapArgs)
}`)
}
func getGeneratorInputResource() []byte {
return []byte(`
apiVersion: config.kubernetes.io/v1
kind: ResourceList
functionConfig:
apiVersion: foo-corp.com/v1
kind: FulfillmentCenter
metadata:
name: staging
annotations:
config.kubernetes.io/function: |
container:
image: gcr.io/example/foo:v1.0.0
data:
metadata:
name: staging
items: []
`)
}
func TestGeneratorConverter(t *testing.T) {
dir := makeTempDir(t)
defer os.RemoveAll(dir)
ioutil.WriteFile(filepath.Join(dir, "Plugin.go"),
getGeneratorCode(), 0644)
c := NewConverter(filepath.Join(dir, "output"),
filepath.Join(dir, "Plugin.go"))
err := c.Convert()
assert.NoError(t, err)
output := runKrmFunction(t, getGeneratorInputResource(), filepath.Join(dir, "output"))
assert.Equal(t, `apiVersion: config.kubernetes.io/v1
kind: ResourceList
items:
- apiVersion: v1
kind: ConfigMap
metadata:
name: staging
functionConfig:
apiVersion: foo-corp.com/v1
kind: FulfillmentCenter
metadata:
name: staging
annotations:
config.kubernetes.io/function: |
container:
image: gcr.io/example/foo:v1.0.0
data:
metadata:
name: staging
`, string(output))
}