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deployment.go
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deployment.go
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package main
import (
"context"
"crypto/tls"
"encoding/json"
"fmt"
"io/ioutil"
"net/http"
"time"
"github.com/hoangphanthai/Kubernetes_Custom_Resource_Controller/api/types/v1alpha1"
appsv1 "k8s.io/api/apps/v1"
apiv1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/client-go/util/retry"
)
func createExternalSecret(appName string, exSecretMap map[string]string) error {
showMessage(" -> Creating External Secret")
secret := &apiv1.Secret{
ObjectMeta: metav1.ObjectMeta{
Name: appName + "-externalsecret",
},
StringData: exSecretMap,
}
_, err := secretsClient.Create(context.TODO(), secret, metav1.CreateOptions{})
if err != nil {
showMessage(err.Error())
}
return err
}
func getEvnMap(url string) (map[string]string, error) {
tr := &http.Transport{
TLSClientConfig: &tls.Config{InsecureSkipVerify: true},
}
client := &http.Client{Transport: tr, Timeout: 3 * time.Second}
response, err := client.Get(url)
if err != nil {
return nil, err
}
var objmap map[string]interface{}
bodyBytes, _ := ioutil.ReadAll(response.Body)
err = json.Unmarshal(bodyBytes, &objmap)
if err != nil {
return nil, err
}
mapString := make(map[string]string)
for key, value := range objmap {
strKey := fmt.Sprintf("%v", key)
strValue := fmt.Sprintf("%v", value)
mapString[strKey] = strValue
}
defer response.Body.Close()
return mapString, nil
}
func getExtSecretStatus(newApp *v1alpha1.Application) bool {
// Get the previous version of secret
oneSecret, errExSecret := secretsClient.Get(context.TODO(), newApp.Name+"-externalsecret", metav1.GetOptions{})
extSecretIsValid := (errExSecret == nil)
url := newApp.Spec.Externalsecret.URL
exSecretMap, err := getEvnMap(url)
if err == nil {
if !extSecretIsValid {
// Previous external secret is not existing -> create new from given URL
err3 := createExternalSecret(newApp.Name, exSecretMap)
if err3 != nil {
showMessage("An error occurs when creating external secret in K8s")
showMessage(err3.Error())
extSecretIsValid = false
} else {
extSecretIsValid = true
//showMessage(" -> New external secret is created successfully!")
}
} else {
// External secret exists -> update it
oneSecret.StringData = exSecretMap
retryErr := retry.RetryOnConflict(retry.DefaultRetry, func() error {
_, updateErr := secretsClient.Update(context.TODO(), oneSecret, metav1.UpdateOptions{})
return updateErr
})
if retryErr != nil {
showMessage(retryErr.Error())
showMessage("---Previous version of external secret remains")
} else {
showMessage("---External secret updated successfully...")
}
// Either old secret or the updated one is valid
extSecretIsValid = true
}
} else {
if len(url) > 0 {
showMessage("The external secret (via URL) is changed or requested to reload, but invalid or inaccessible!")
}
}
return extSecretIsValid
}
func createDeployment(newApp *v1alpha1.Application) {
extSecretIsValid := getExtSecretStatus(newApp)
// Check existence of database's configmap or secret on k8s
_, err := configMapsClient.Get(context.TODO(), newApp.Spec.Database.Spec.Configmap.Name, metav1.GetOptions{})
configmapExists := (err == nil)
_, err = secretsClient.Get(context.TODO(), newApp.Spec.Database.Spec.Secret.Name, metav1.GetOptions{})
secretExists := (err == nil)
containerList := newApp.Spec.Template.Spec.Containers
// 2.3 External secret is valid and created
if newApp.Spec.Database.Enable {
for i := 0; i < len(containerList); i++ {
if configmapExists && secretExists {
// Both database configmap and secret exists
containerList[i].EnvFrom = []apiv1.EnvFromSource{
{ConfigMapRef: &apiv1.ConfigMapEnvSource{LocalObjectReference: apiv1.LocalObjectReference{Name: newApp.Spec.Database.Spec.Configmap.Name}}},
{SecretRef: &apiv1.SecretEnvSource{LocalObjectReference: apiv1.LocalObjectReference{Name: newApp.Spec.Database.Spec.Secret.Name}}},
}
} else {
// Either database configmap or secret exists
if configmapExists {
containerList[i].EnvFrom = []apiv1.EnvFromSource{
{ConfigMapRef: &apiv1.ConfigMapEnvSource{LocalObjectReference: apiv1.LocalObjectReference{Name: newApp.Spec.Database.Spec.Configmap.Name}}},
}
}
if secretExists {
containerList[i].EnvFrom = []apiv1.EnvFromSource{
{SecretRef: &apiv1.SecretEnvSource{LocalObjectReference: apiv1.LocalObjectReference{Name: newApp.Spec.Database.Spec.Secret.Name}}},
}
}
}
if extSecretIsValid {
containerList[i].VolumeMounts = []apiv1.VolumeMount{{Name: "externalsecret", MountPath: "/external-secret"}}
}
}
} else {
for i := 0; i < len(containerList); i++ {
if extSecretIsValid {
containerList[i].VolumeMounts = []apiv1.VolumeMount{{Name: "externalsecret", MountPath: "/external-secret"}}
}
}
}
repNo := int32(newApp.Spec.Replicas)
deployment := &appsv1.Deployment{
ObjectMeta: metav1.ObjectMeta{
Name: newApp.Name + "-deployment",
},
Spec: appsv1.DeploymentSpec{
Replicas: &repNo,
Selector: &metav1.LabelSelector{
MatchLabels: map[string]string{
"app": "trial",
},
},
Template: apiv1.PodTemplateSpec{
ObjectMeta: metav1.ObjectMeta{
Labels: map[string]string{
"app": "trial",
},
},
Spec: apiv1.PodSpec{
Containers: []apiv1.Container{},
Volumes: []apiv1.Volume{},
},
},
},
}
if extSecretIsValid {
deployment.Spec.Template.Spec.Volumes = []apiv1.Volume{
{
Name: "externalsecret",
VolumeSource: apiv1.VolumeSource{
Secret: &apiv1.SecretVolumeSource{
SecretName: newApp.Name + "-externalsecret",
},
},
}}
}
deployment.Spec.Template.Spec.Containers = containerList
showMessage(" -> Creating Deployment")
_, err = deploymentsClient.Create(context.TODO(), deployment, metav1.CreateOptions{})
if err != nil {
showMessage(err.Error())
}
}