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main.go
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main.go
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// Copyright 2023 TriggerMesh Inc.
// SPDX-License-Identifier: Apache-2.0
package main
import (
"context"
"encoding/json"
"errors"
"fmt"
"html"
"log"
"math/rand"
"net/http"
"time"
appsv1 "k8s.io/api/apps/v1"
corev1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/api/resource"
"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
"k8s.io/apimachinery/pkg/runtime"
servingv1 "knative.dev/serving/pkg/apis/serving/v1"
hookv1 "github.com/triggermesh/scoby/pkg/apis/hook/v1"
)
const (
ConditionType = "HookReportedStatus"
ConditionReasonOK = "HOOKREPORTSOK"
)
func main() {
h := &HandlerV1{
// initialize random generator for the finalizer.
rnd: rand.New(rand.NewSource(time.Now().UnixNano())),
}
mux := http.NewServeMux()
mux.Handle("/v1/", h)
mux.Handle("/v1", h)
mux.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
http.Error(w, fmt.Sprintf("no resource at path %q", html.EscapeString(r.URL.String())), http.StatusNotFound)
})
srv := http.Server{
Addr: ":8080",
Handler: mux,
}
log.Println("starting kuard hook")
if err := srv.ListenAndServe(); err != nil {
log.Fatal(err)
}
ctx, cancel := context.WithTimeout(context.Background(), time.Second*5)
defer cancel()
if err := srv.Shutdown(ctx); err != nil {
log.Fatal(err)
}
}
// HandlerV1 is an example hooks server.
type HandlerV1 struct {
rnd *rand.Rand
}
func (h *HandlerV1) ServeHTTP(w http.ResponseWriter, r *http.Request) {
hreq := &hookv1.HookRequest{}
if err := json.NewDecoder(r.Body).Decode(hreq); err != nil {
emsg := fmt.Errorf("cannot decode request into HookRequest: %v", err)
logError(emsg)
http.Error(w, emsg.Error(), http.StatusBadRequest)
return
}
// This hook example supports deployment and knative service form factor:
switch hreq.FormFactor.Name {
case "deployment":
h.ServeDeploymentHook(w, hreq)
case "ksvc":
h.ServeKsvcHook(w, hreq)
default:
emsg := fmt.Errorf("request for formfactor %q not supported", hreq.FormFactor.Name)
logError(emsg)
http.Error(w, emsg.Error(), http.StatusBadRequest)
}
}
func (h *HandlerV1) ServeDeploymentHook(w http.ResponseWriter, r *hookv1.HookRequest) {
switch r.Phase {
case hookv1.PhasePreReconcile:
h.deploymentPreReconcile(w, r)
case hookv1.PhaseFinalize:
h.deploymentFinalize(w, r)
default:
emsg := fmt.Errorf("request for phase %q not supported", r.Phase)
logError(emsg)
http.Error(w, emsg.Error(), http.StatusBadRequest)
}
}
func (h *HandlerV1) deploymentPreReconcile(w http.ResponseWriter, r *hookv1.HookRequest) {
log.Printf("pre-reconcile deployment")
// deployment form factor creates a "deployment" children entry
ch, ok := r.Children["deployment"]
if !ok {
emsg := errors.New("children deployment element not found")
logError(emsg)
http.Error(w, emsg.Error(), http.StatusBadRequest)
return
}
d := &appsv1.Deployment{}
if err := runtime.DefaultUnstructuredConverter.FromUnstructured(ch.Object, d); err != nil {
emsg := fmt.Errorf("malformed deployment at children element: %w", err)
logError(emsg)
http.Error(w, emsg.Error(), http.StatusBadRequest)
return
}
// This hook is going to modify elements of the first container
cs := d.Spec.Template.Spec.Containers
if len(cs) == 0 {
emsg := errors.New("children deployment has no containers")
logError(emsg)
http.Error(w, emsg.Error(), http.StatusBadRequest)
return
}
cs[0].Env = append(cs[0].Env,
corev1.EnvVar{
Name: "FROM_HOOK_VAR",
Value: "this value is set from the hook",
})
cs[0].Resources = corev1.ResourceRequirements{
Requests: corev1.ResourceList{
corev1.ResourceCPU: *resource.NewMilliQuantity(100, resource.DecimalSI),
corev1.ResourceMemory: *resource.NewQuantity(1024*1024*100, resource.BinarySI),
},
Limits: corev1.ResourceList{
corev1.ResourceCPU: *resource.NewMilliQuantity(250, resource.DecimalSI),
},
}
// Write the new object back to the children element and use it
// at the hook's reply.
u, err := runtime.DefaultUnstructuredConverter.ToUnstructured(d)
if err != nil {
emsg := fmt.Errorf("could not convert modified deployment into unstructured: %w", err)
logError(emsg)
http.Error(w, emsg.Error(), http.StatusBadRequest)
return
}
r.Children["deployment"] = &unstructured.Unstructured{Object: u}
if err := h.setHookStatusPreReconcile(w, &r.Object, string(corev1.ConditionTrue), ConditionReasonOK); err != nil {
emsg := fmt.Errorf("error setting object status: %w", err)
logError(emsg)
http.Error(w, emsg.Error(), http.StatusInternalServerError)
return
}
hres := &hookv1.HookResponse{
Object: &r.Object,
Children: r.Children,
}
if err := json.NewEncoder(w).Encode(hres); err != nil {
emsg := fmt.Errorf("error encoding response: %w", err)
logError(emsg)
http.Error(w, emsg.Error(), http.StatusInternalServerError)
return
}
w.Header().Set("Content-Type", "application/json")
}
func (h *HandlerV1) deploymentFinalize(w http.ResponseWriter, r *hookv1.HookRequest) {
log.Printf("finalize deployment")
h.randomFinalize(w)
}
func (h *HandlerV1) ServeKsvcHook(w http.ResponseWriter, r *hookv1.HookRequest) {
switch r.Phase {
case hookv1.PhasePreReconcile:
h.ksvcPreReconcile(w, r)
case hookv1.PhaseFinalize:
h.ksvcFinalize(w, r)
}
emsg := fmt.Errorf("request for phase %q not supported", r.Phase)
logError(emsg)
http.Error(w, emsg.Error(), http.StatusBadRequest)
}
func (h *HandlerV1) ksvcPreReconcile(w http.ResponseWriter, r *hookv1.HookRequest) {
log.Printf("pre-reconcile ksvc")
// knative service form factor creates a "ksvc" children entry
ch, ok := r.Children["ksvc"]
if !ok {
emsg := errors.New("children ksvc element not found")
logError(emsg)
http.Error(w, emsg.Error(), http.StatusBadRequest)
return
}
ksvc := servingv1.Service{}
if err := runtime.DefaultUnstructuredConverter.FromUnstructured(ch.Object, ksvc); err != nil {
emsg := fmt.Errorf("malformed ksvc at children element: %w", err)
logError(emsg)
http.Error(w, emsg.Error(), http.StatusBadRequest)
return
}
// This hook is going to modify elements of the first container
cs := ksvc.Spec.Template.Spec.Containers
if len(cs) == 0 {
emsg := errors.New("children knative service has no containers")
logError(emsg)
http.Error(w, emsg.Error(), http.StatusBadRequest)
return
}
cs[0].Env = append(cs[0].Env,
corev1.EnvVar{
Name: "FROM_HOOK",
Value: "value set from hook",
})
cs[0].Resources = corev1.ResourceRequirements{
Requests: corev1.ResourceList{
corev1.ResourceCPU: *resource.NewMilliQuantity(100, resource.DecimalSI),
corev1.ResourceMemory: *resource.NewQuantity(1024*1024*100, resource.BinarySI),
},
Limits: corev1.ResourceList{
corev1.ResourceCPU: *resource.NewMilliQuantity(250, resource.DecimalSI),
},
}
// Write the new object back to the children element and use it
// at the hook's reply.
u, err := runtime.DefaultUnstructuredConverter.ToUnstructured(ksvc)
if err != nil {
emsg := fmt.Errorf("could not convert modified knative service into unstructured: %w", err)
logError(emsg)
http.Error(w, emsg.Error(), http.StatusBadRequest)
return
}
r.Children["ksvc"] = &unstructured.Unstructured{Object: u}
if err := h.setHookStatusPreReconcile(w, &r.Object, string(corev1.ConditionTrue), ConditionReasonOK); err != nil {
emsg := fmt.Errorf("error setting object status: %w", err)
logError(emsg)
http.Error(w, emsg.Error(), http.StatusInternalServerError)
return
}
hres := &hookv1.HookResponse{
Object: &r.Object,
Children: r.Children,
}
if err := json.NewEncoder(w).Encode(hres); err != nil {
emsg := fmt.Errorf("error encoding response: %w", err)
logError(emsg)
http.Error(w, emsg.Error(), http.StatusInternalServerError)
return
}
w.Header().Set("Content-Type", "application/json")
}
func (h *HandlerV1) ksvcFinalize(w http.ResponseWriter, r *hookv1.HookRequest) {
log.Printf("finalize ksvc")
h.randomFinalize(w)
}
func (h *HandlerV1) setHookStatusPreReconcile(w http.ResponseWriter, u *unstructured.Unstructured, status, reason string) error {
if conditions, ok, _ := unstructured.NestedSlice(u.Object, "status", "conditions"); ok {
var hookCondition map[string]interface{}
// Look for existing condition
for i := range conditions {
c, ok := conditions[i].(map[string]interface{})
if !ok {
return fmt.Errorf("wrong condition format: %+v", conditions[i])
}
t, ok := c["type"].(string)
if !ok {
return fmt.Errorf("wrong condition type: %+v", c["type"])
}
if ok && t == ConditionType {
hookCondition = conditions[i].(map[string]interface{})
break
}
}
// If the condition does not exist, create it.
if hookCondition == nil {
hookCondition = map[string]interface{}{
"type": ConditionType,
}
conditions = append(conditions, hookCondition)
}
hookCondition["status"] = status
hookCondition["reason"] = reason
if err := unstructured.SetNestedSlice(u.Object, conditions, "status", "conditions"); err != nil {
return err
}
}
annotations, ok, _ := unstructured.NestedStringMap(u.Object, "status", "annotations")
if !ok {
annotations = map[string]string{}
}
annotations["greetings"] = "from hook"
return unstructured.SetNestedStringMap(u.Object, annotations, "status", "annotations")
}
func (h *HandlerV1) randomFinalize(w http.ResponseWriter) {
// If 0 cancel finalization, if 1 let it happen
if h.rnd.Intn(2) == 0 {
log.Printf("canceling finalization ...")
w.WriteHeader(http.StatusInternalServerError)
w.Header().Set("Content-Type", "application/json")
_false := false
herr := &hookv1.HookResponseError{
Message: "finalization denied from hook",
Permanent: &_false,
}
if err := json.NewEncoder(w).Encode(herr); err != nil {
emsg := fmt.Errorf("error encoding response: %w", err)
logError(emsg)
http.Error(w, emsg.Error(), http.StatusInternalServerError)
}
} else {
log.Printf("hook says yes to finalization")
}
}
func logError(err error) {
log.Printf("Error: %v\n", err)
}