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emmie.go
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emmie.go
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/*
Copyright (c) 2015, UPMC Enterprises
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
* Neither the name UPMC Enterprises nor the
names of its contributors may be used to endorse or promote products
derived from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL UPMC ENTERPRISES BE LIABLE FOR ANY
DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
*/
package main
import (
"bufio"
"flag"
"fmt"
"log"
"net/http"
"os"
"strings"
"time"
"github.com/gorilla/mux"
"k8s.io/client-go/1.4/kubernetes"
"k8s.io/client-go/1.4/pkg/api/v1"
"k8s.io/client-go/1.4/pkg/apis/extensions/v1beta1"
"k8s.io/client-go/1.4/rest"
)
var (
argListenPort = flag.Int("listen-port", 9080, "port to have API listen")
argDockerRegistry = flag.String("docker-registry", "", "docker registry to use")
argKubecfgFile = flag.String("kubecfg-file", "", "Location of kubecfg file for access to kubernetes master service; --kube_master_url overrides the URL part of this; if neither this nor --kube_master_url are provided, defaults to service account tokens")
argKubeMasterURL = flag.String("kube-master-url", "", "URL to reach kubernetes master. Env variables in this flag will be expanded.")
argTemplateNamespace = flag.String("template-namespace", "template", "Namespace to 'clone from when creating new deployments'")
argPathToTokens = flag.String("path-to-tokens", "", "Full path including file name to tokens file for authorization, setting to empty string will disable.")
argSubDomain = flag.String("subdomain", "k8s.local.com", "Subdomain used to configure external routing to branch (e.g. namespace.ci.k8s.local)")
argAwsRegion = flag.String("awsregion", "us-east-1", "Region matching ECR")
argsAWSRegistryID = flag.String("awsregistryid", "", "AWS registryID (account number)")
client *kubernetes.Clientset
defaultReplicaCount *int32
)
const (
appVersion = "0.0.5"
)
// Default (GET "/")
func indexRoute(w http.ResponseWriter, r *http.Request) {
fmt.Fprintf(w, "Hello, %s", "welcome to Emmie!")
}
// Version (GET "/version")
func versionRoute(w http.ResponseWriter, r *http.Request) {
if !tokenIsValid(r.FormValue("token")) {
w.WriteHeader(http.StatusUnauthorized)
return
}
fmt.Fprintf(w, "%q", appVersion)
}
// Deploy (POST "/deploy/namespace/branchName")
func deployRoute(w http.ResponseWriter, r *http.Request) {
vars := mux.Vars(r)
branchName := vars["branchName"]
imageNamespace := vars["namespace"]
if !tokenIsValid(r.FormValue("token")) {
w.WriteHeader(http.StatusUnauthorized)
return
}
// sanitize BranchName
branchName = strings.Replace(branchName, "_", "-", -1)
log.Println("[Emmie] is deploying branch:", branchName)
// create namespace
err := createNamespace(branchName)
if err != nil {
// TODO: Don't use error for logic
// Existing namespace, do an update
log.Println("Existing namespace found: ", branchName, " deleting objects.")
deleteAllObjects(branchName)
deletePodsByNamespace(branchName)
// Meh
time.Sleep(time.Second * 4)
} else {
log.Println("Namespace created, deploying new app...")
}
// copy controllers / services based on label query
rcs, _ := listReplicationControllersByNamespace(*argTemplateNamespace)
log.Println("Found ", len(rcs.Items), " template replication controllers to copy.")
deployments, _ := listDeploymentsByNamespace(*argTemplateNamespace)
log.Println("Found ", len(deployments.Items), " template deployments to copy.")
svcs, _ := listServicesByNamespace(*argTemplateNamespace)
log.Println("Found ", len(svcs.Items), " template services to copy.")
secrets, _ := listSecretsByNamespace(*argTemplateNamespace)
log.Println("Found ", len(secrets.Items), " template secrets to copy.")
configmaps, _ := listConfigMapsByNamespace(*argTemplateNamespace)
log.Println("Found ", len(configmaps.Items), " template configmaps to copy.")
ingresses, _ := listIngresssByNamespace(*argTemplateNamespace)
log.Println("Found ", len(ingresses.Items), " template ingresses to copy.")
// create configmaps
for _, configmap := range configmaps.Items {
requestConfigMap := &v1.ConfigMap{
ObjectMeta: v1.ObjectMeta{
Name: configmap.Name,
Namespace: branchName,
},
Data: configmap.Data,
}
createConfigMap(branchName, requestConfigMap)
}
// create secrets
for _, secret := range secrets.Items {
// skip service accounts
if secret.Type != "kubernetes.io/service-account-token" {
requestSecret := &v1.Secret{
ObjectMeta: v1.ObjectMeta{
Name: secret.Name,
Namespace: branchName,
},
Type: secret.Type,
Data: secret.Data,
}
createSecret(branchName, requestSecret)
}
}
// create services
for _, svc := range svcs.Items {
requestService := &v1.Service{
ObjectMeta: v1.ObjectMeta{
Name: svc.ObjectMeta.Name,
Namespace: branchName,
},
}
ports := []v1.ServicePort{}
for _, port := range svc.Spec.Ports {
newPort := v1.ServicePort{
Name: port.Name,
Protocol: port.Protocol,
Port: port.Port,
TargetPort: port.TargetPort,
}
ports = append(ports, newPort)
}
requestService.Spec.Ports = ports
requestService.Spec.Selector = svc.Spec.Selector
requestService.Spec.Type = svc.Spec.Type
requestService.Labels = svc.Labels
createService(branchName, requestService)
}
// now that we have all replicationControllers, update them to have new image name
for _, rc := range rcs.Items {
containerNameToUpdate := ""
// Looks for annotations to know which container to replace
for key, value := range rc.Annotations {
if key == "emmie-update" {
containerNameToUpdate = value
}
}
// Find the container which matches the annotation
for i, container := range rc.Spec.Template.Spec.Containers {
imageName := container.Image
if containerNameToUpdate == rc.Spec.Template.Spec.Containers[i].Name {
if *argsAWSRegistryID != "" {
// Check if image exists in ECR
imageTag := fmt.Sprintf("%s/%s", imageNamespace, rc.ObjectMeta.Name)
exists, err := imageTagExists(imageTag, branchName, *argAwsRegion, *argsAWSRegistryID)
if err != nil {
log.Println("Error looking up image tag in ECR: ", err)
}
// if the image tag exists, then update to use, otherwise default
if exists {
imageName = fmt.Sprintf("%s%s/%s:%s", *argDockerRegistry, imageNamespace, rc.ObjectMeta.Name, branchName)
}
} else {
imageName = fmt.Sprintf("%s%s/%s:%s", *argDockerRegistry, imageNamespace, rc.ObjectMeta.Name, branchName)
}
}
rc.Spec.Template.Spec.Containers[i].Image = imageName
// Set the image pull policy to "Always"
rc.Spec.Template.Spec.Containers[i].ImagePullPolicy = "Always"
}
requestController := &v1.ReplicationController{
ObjectMeta: v1.ObjectMeta{
Name: rc.ObjectMeta.Name,
Namespace: branchName,
},
}
requestController.Spec = rc.Spec
requestController.Annotations = rc.Annotations
requestController.Spec.Replicas = defaultReplicaCount
// create new replication controller
createReplicationController(branchName, requestController)
}
// now that we have all deployments, update them to have new image name
for _, dply := range deployments.Items {
containerNameToUpdate := ""
// Looks for annotations to know which container to replace
for key, value := range dply.Annotations {
if key == "emmie-update" {
log.Printf("Container to update with emmie is: %s", value)
containerNameToUpdate = value
}
}
// Find the container which matches the annotation
for i, container := range dply.Spec.Template.Spec.Containers {
imageName := container.Image
if containerNameToUpdate == dply.Spec.Template.Spec.Containers[i].Name {
if *argsAWSRegistryID != "" {
// Check if image exists in ECR
imageTag := fmt.Sprintf("%s/%s", imageNamespace, dply.ObjectMeta.Name)
exists, err := imageTagExists(imageTag, branchName, *argAwsRegion, *argsAWSRegistryID)
if err != nil {
log.Println("Error looking up image tag in ECR: ", err)
}
// if the image tag exists, then update to use, otherwise default
if exists {
log.Printf("Image tag found in ECR, updating image [%s] with tag [%s]", dply.ObjectMeta.Name, branchName)
imageName = fmt.Sprintf("%s%s/%s:%s", *argDockerRegistry, imageNamespace, dply.ObjectMeta.Name, branchName)
}
} else {
imageName = fmt.Sprintf("%s%s/%s:%s", *argDockerRegistry, imageNamespace, dply.ObjectMeta.Name, branchName)
}
}
dply.Spec.Template.Spec.Containers[i].Image = imageName
// Set the image pull policy to "Always"
dply.Spec.Template.Spec.Containers[i].ImagePullPolicy = "Always"
}
deployment := &v1beta1.Deployment{
ObjectMeta: v1.ObjectMeta{
Name: dply.ObjectMeta.Name,
Namespace: branchName,
},
}
deployment.Spec = dply.Spec
deployment.Annotations = dply.Annotations
deployment.Spec.Replicas = defaultReplicaCount
// create new deployment
createDeployment(branchName, deployment)
}
appendContainerToIngress := len(ingresses.Items) > 0
namespace := branchName
// create ingress
for _, ingress := range ingresses.Items {
rules := ingress.Spec.Rules
// Found multiple ingresses, append ingress name to make unique
if appendContainerToIngress {
branchName = fmt.Sprintf("%s-%s", ingress.Name, namespace)
}
rules[0].Host = fmt.Sprintf("%s.%s", branchName, *argSubDomain)
requestIngress := &v1beta1.Ingress{
ObjectMeta: v1.ObjectMeta{
Name: ingress.Name,
Namespace: namespace,
},
Spec: v1beta1.IngressSpec{
Rules: rules,
},
}
createIngress(namespace, requestIngress)
}
log.Println("[Emmie] is finished deploying branch!")
}
// Delete (DELETE "/deploy")
func deleteRoute(w http.ResponseWriter, r *http.Request) {
vars := mux.Vars(r)
branchName := vars["branchName"]
log.Println("[Emmie] is deleting branch:", branchName)
if !tokenIsValid(r.FormValue("token")) {
w.WriteHeader(http.StatusUnauthorized)
return
}
// sanitize BranchName
branchName = strings.Replace(branchName, "_", "-", -1)
deleteAllObjects(branchName)
deleteNamespace(branchName)
log.Println("[Emmie] is done deleting branch.")
}
// Deletes everything but the namespace
func deleteAllObjects(branchName string) {
// get controllers / services / secrets in namespace
rcs, _ := listReplicationControllersByNamespace(*argTemplateNamespace)
for _, rc := range rcs.Items {
deleteReplicationController(branchName, rc.ObjectMeta.Name)
log.Println("Deleted replicationController:", rc.ObjectMeta.Name)
}
deployments, _ := listDeploymentsByNamespace(*argTemplateNamespace)
for _, dply := range deployments.Items {
deleteDeployment(branchName, dply.ObjectMeta.Name)
log.Println("Deleted deployment:", dply.ObjectMeta.Name)
}
svcs, _ := listServicesByNamespace(*argTemplateNamespace)
for _, svc := range svcs.Items {
deleteService(branchName, svc.ObjectMeta.Name)
log.Println("Deleted service:", svc.ObjectMeta.Name)
}
secrets, _ := listSecretsByNamespace(*argTemplateNamespace)
for _, secret := range secrets.Items {
deleteSecret(branchName, secret.ObjectMeta.Name)
log.Println("Deleted secret:", secret.ObjectMeta.Name)
}
configmaps, _ := listConfigMapsByNamespace(*argTemplateNamespace)
for _, configmap := range configmaps.Items {
deleteSecret(branchName, configmap.ObjectMeta.Name)
log.Println("Deleted configmap:", configmap.ObjectMeta.Name)
}
ingresses, _ := listIngresssByNamespace(*argTemplateNamespace)
for _, ingress := range ingresses.Items {
deleteIngress(branchName, ingress.ObjectMeta.Name)
log.Println("Deleted ingress:", ingress.ObjectMeta.Name)
}
}
func tokenIsValid(token string) bool {
// If no path is passed, then auth is disabled
if *argPathToTokens == "" {
return true
}
file, err := os.Open(*argPathToTokens)
if err != nil {
log.Fatal(err)
}
defer file.Close()
scanner := bufio.NewScanner(file)
for scanner.Scan() {
if token == scanner.Text() {
fmt.Println("Token IS valid!")
return true
}
}
if err := scanner.Err(); err != nil {
log.Fatal(err)
}
fmt.Println("Token is NOT valid! =(")
return false
}
func main() {
flag.Parse()
log.Println("[Emmie] is up and running!", time.Now())
// Sanitize docker registry
if *argDockerRegistry != "" {
*argDockerRegistry = fmt.Sprintf("%s/", *argDockerRegistry)
}
// Configure router
router := mux.NewRouter().StrictSlash(true)
router.HandleFunc("/", indexRoute)
router.HandleFunc("/deploy/{namespace}/{branchName}", deployRoute).Methods("POST")
router.HandleFunc("/deploy/{branchName}", deleteRoute).Methods("DELETE")
router.HandleFunc("/deploy", getDeploymentsRoute).Methods("GET")
// Services
// router.HandleFunc("/services/{namespace}/{serviceName}", getServiceRoute).Methods("GET")
// router.HandleFunc("/services/{namespace}/{key}/{value}", getServicesRoute).Methods("GET")
// ReplicationControllers
// router.HandleFunc("/replicationControllers/{namespace}/{rcName}", getReplicationControllerRoute).Methods("GET")
// router.HandleFunc("/replicationControllers/{namespace}/{key}/{value}", getReplicationControllersRoute).Methods("GET")
// Deployments
// router.HandleFunc("/deployments/{namespace}/{deploymentName}", getDeploymentRoute).Methods("GET")
// router.HandleFunc("/deployments/{namespace}/{key}/{value}", getDeploymentsRoute).Methods("GET")
// Version
router.HandleFunc("/version", versionRoute)
// Create k8s client
config, err := rest.InClusterConfig()
//config, err := clientcmd.BuildConfigFromFlags("", *argKubecfgFile)
if err != nil {
panic(err.Error())
}
// creates the clientset
clientset, err := kubernetes.NewForConfig(config)
if err != nil {
panic(err.Error())
}
client = clientset
// Start server
log.Fatal(http.ListenAndServeTLS(fmt.Sprintf(":%d", *argListenPort), "certs/cert.pem", "certs/key.pem", router))
//log.Fatal(http.ListenAndServe(fmt.Sprintf(":%d", *argListenPort), router))
}