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context.go
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context.go
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package cmd
import (
"bytes"
"context"
"fmt"
"io"
"io/ioutil"
"path/filepath"
"time"
"github.com/ghodss/yaml"
v1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/runtime/schema"
kubeyaml "k8s.io/apimachinery/pkg/util/yaml"
"k8s.io/client-go/dynamic"
informersv1 "k8s.io/client-go/informers/core/v1"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/tools/cache"
"github.com/argoproj/notifications-engine/pkg/api"
)
type commandContext struct {
api.Settings
resource schema.GroupVersionResource
dynamicClient dynamic.Interface
k8sClient kubernetes.Interface
cliName string
configMapPath string
secretPath string
stdout io.Writer
stdin io.Reader
stderr io.Writer
namespace string
}
func splitYAML(yamlData []byte) ([]*unstructured.Unstructured, error) {
d := kubeyaml.NewYAMLOrJSONDecoder(bytes.NewReader(yamlData), 4096)
var objs []*unstructured.Unstructured
for {
ext := runtime.RawExtension{}
if err := d.Decode(&ext); err != nil {
if err == io.EOF {
break
}
return objs, fmt.Errorf("failed to unmarshal manifest: %v", err)
}
ext.Raw = bytes.TrimSpace(ext.Raw)
if len(ext.Raw) == 0 || bytes.Equal(ext.Raw, []byte("null")) {
continue
}
u := &unstructured.Unstructured{}
if err := yaml.Unmarshal(ext.Raw, u); err != nil {
return objs, fmt.Errorf("failed to unmarshal manifest: %v", err)
}
objs = append(objs, u)
}
return objs, nil
}
func (c *commandContext) unmarshalFromFile(filePath string, name string, gk schema.GroupKind, result interface{}) error {
var err error
var data []byte
if filePath == "-" {
data, err = ioutil.ReadAll(c.stdin)
} else {
data, err = ioutil.ReadFile(filePath)
}
if err != nil {
return err
}
objs, err := splitYAML(data)
if err != nil {
return err
}
for _, obj := range objs {
if obj.GetName() == name && obj.GroupVersionKind().GroupKind() == gk {
return runtime.DefaultUnstructuredConverter.FromUnstructured(obj.Object, result)
}
}
return fmt.Errorf("file '%s' does not have '%s/%s/%s'", filePath, gk.Group, gk.Kind, name)
}
func (c *commandContext) loadResource(name string) (*unstructured.Unstructured, error) {
if ext := filepath.Ext(name); ext != "" {
data, err := ioutil.ReadFile(name)
if err != nil {
return nil, err
}
var res unstructured.Unstructured
err = yaml.Unmarshal(data, &res)
return &res, err
}
res, err := c.dynamicClient.Resource(c.resource).Namespace(c.namespace).Get(context.Background(), name, metav1.GetOptions{})
if err != nil {
return nil, err
}
return res, nil
}
func (c *commandContext) getSecret() (*v1.Secret, error) {
var secret v1.Secret
if c.secretPath == ":empty" {
secret = v1.Secret{}
} else if c.secretPath == "" {
s, err := c.k8sClient.CoreV1().Secrets(c.namespace).Get(context.Background(), c.SecretName, metav1.GetOptions{})
if err != nil {
return nil, err
}
secret = *s
} else {
if err := c.unmarshalFromFile(c.secretPath, c.SecretName, schema.GroupKind{Kind: "Secret"}, &secret); err != nil {
return nil, err
}
if secret.Data == nil {
secret.Data = map[string][]byte{}
}
for k, v := range secret.StringData {
secret.Data[k] = []byte(v)
}
}
secret.Name = c.SecretName
secret.Namespace = c.namespace
return &secret, nil
}
func (c *commandContext) getConfigMap() (*v1.ConfigMap, error) {
var configMap v1.ConfigMap
if c.configMapPath == "" {
cm, err := c.k8sClient.CoreV1().ConfigMaps(c.namespace).Get(context.Background(), c.ConfigMapName, metav1.GetOptions{})
if err != nil {
return nil, err
}
configMap = *cm
} else {
if err := c.unmarshalFromFile(c.configMapPath, c.ConfigMapName, schema.GroupKind{Kind: "ConfigMap"}, &configMap); err != nil {
return nil, err
}
}
configMap.Name = c.ConfigMapName
configMap.Namespace = c.namespace
return &configMap, nil
}
func (c *commandContext) getAPI() (api.API, error) {
secretInformer := informersv1.NewSecretInformer(c.k8sClient, c.namespace, time.Minute*3, cache.Indexers{})
s, err := c.getSecret()
if err != nil {
return nil, err
}
if err := secretInformer.GetStore().Add(s); err != nil {
return nil, err
}
cm, err := c.getConfigMap()
if err != nil {
return nil, err
}
cmInformer := informersv1.NewConfigMapInformer(c.k8sClient, c.namespace, time.Minute*3, cache.Indexers{})
if err := cmInformer.GetStore().Add(cm); err != nil {
return nil, err
}
return api.NewFactory(c.Settings, c.namespace, secretInformer, cmInformer).GetAPI()
}