Implementation of status notification mechanism0.10.0

- Subscription CRUD endpoints
- Subscription notifu executor
- Cleanup of subscriptions on instance delete
- Sending notification to the specified callback

Issue-ID: MULTICLOUD-1445
Signed-off-by: Lukasz Rajewski <lukasz.rajewski@orange.com>
Change-Id: I5b867a348e916f6c2c471bcc5326c831d832f45e

1 files changed, 229 insertions, 0 deletions

diff --git a/src/k8splugin/api/statussubhandler.go b/src/k8splugin/api/statussubhandler.go
new file mode 100644
index 00000000..c5c8de23
--- /dev/null
+++ b/src/k8splugin/api/statussubhandler.go
@@ -0,0 +1,229 @@
+/*
+Copyright © 2022 Orange
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+    http://www.apache.org/licenses/LICENSE-2.0
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package api
+
+import (
+	"encoding/json"
+	"io"
+	"net/http"
+
+	"github.com/onap/multicloud-k8s/src/k8splugin/internal/app"
+	log "github.com/onap/multicloud-k8s/src/k8splugin/internal/logutils"
+
+	"github.com/gorilla/mux"
+)
+
+// Used to store the backend implementation objects
+// Also simplifies the mocking needed for unit testing
+type instanceStatusSubHandler struct {
+	// Interface that implements Status Subscription operations
+	client app.InstanceStatusSubManager
+}
+
+func (iss instanceStatusSubHandler) createHandler(w http.ResponseWriter, r *http.Request) {
+	vars := mux.Vars(r)
+	id := vars["instID"]
+
+	var subRequest app.SubscriptionRequest
+
+	err := json.NewDecoder(r.Body).Decode(&subRequest)
+	switch {
+	case err == io.EOF:
+		log.Error("Body Empty", log.Fields{
+			"error": io.EOF,
+		})
+		http.Error(w, "Body empty", http.StatusBadRequest)
+		return
+	case err != nil:
+		log.Error("Error unmarshaling Body", log.Fields{
+			"error": err,
+		})
+		http.Error(w, err.Error(), http.StatusUnprocessableEntity)
+		return
+	}
+
+	// Name is required.
+	if subRequest.Name == "" {
+		http.Error(w, "Missing name in POST request", http.StatusBadRequest)
+		return
+	}
+
+	// MinNotifyInterval cannot be less than 0
+	if subRequest.MinNotifyInterval < 0 {
+		http.Error(w, "Min Notify Interval has invalid value", http.StatusBadRequest)
+		return
+	}
+
+	// CallbackUrl is required
+	if subRequest.CallbackUrl == "" {
+		http.Error(w, "CallbackUrl has invalid value", http.StatusBadRequest)
+		return
+	}
+
+	resp, err := iss.client.Create(id, subRequest)
+	if err != nil {
+		log.Error("Error creating subscription", log.Fields{
+			"error":    err,
+			"instance": id,
+			"response": resp,
+		})
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+
+	w.Header().Set("Content-Type", "application/json")
+	w.WriteHeader(http.StatusCreated)
+	err = json.NewEncoder(w).Encode(resp)
+	if err != nil {
+		log.Error("Error Marshaling Response", log.Fields{
+			"error":    err,
+			"response": resp,
+		})
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+}
+
+func (iss instanceStatusSubHandler) getHandler(w http.ResponseWriter, r *http.Request) {
+	vars := mux.Vars(r)
+	instanceId := vars["instID"]
+	subId := vars["subID"]
+
+	resp, err := iss.client.Get(instanceId, subId)
+	if err != nil {
+		log.Error("Error getting instance's Status Subscription", log.Fields{
+			"error":          err,
+			"instanceID":     instanceId,
+			"subscriptionID": subId,
+		})
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+
+	w.Header().Set("Content-Type", "application/json")
+	w.WriteHeader(http.StatusOK)
+	err = json.NewEncoder(w).Encode(resp)
+	if err != nil {
+		log.Error("Error Marshaling Response", log.Fields{
+			"error":    err,
+			"response": resp,
+		})
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+}
+
+func (iss instanceStatusSubHandler) updateHandler(w http.ResponseWriter, r *http.Request) {
+	vars := mux.Vars(r)
+	instanceId := vars["instID"]
+	subId := vars["subID"]
+
+	var subRequest app.SubscriptionRequest
+
+	err := json.NewDecoder(r.Body).Decode(&subRequest)
+	switch {
+	case err == io.EOF:
+		log.Error("Body Empty", log.Fields{
+			"error": io.EOF,
+		})
+		http.Error(w, "Body empty", http.StatusBadRequest)
+		return
+	case err != nil:
+		log.Error("Error unmarshaling Body", log.Fields{
+			"error": err,
+		})
+		http.Error(w, err.Error(), http.StatusUnprocessableEntity)
+		return
+	}
+
+	// MinNotifyInterval cannot be less than 0
+	if subRequest.MinNotifyInterval < 0 {
+		http.Error(w, "Min Notify Interval has invalid value", http.StatusBadRequest)
+		return
+	}
+
+	// CallbackUrl is required
+	if subRequest.CallbackUrl == "" {
+		http.Error(w, "CallbackUrl has invalid value", http.StatusBadRequest)
+		return
+	}
+
+	resp, err := iss.client.Update(instanceId, subId, subRequest)
+	if err != nil {
+		log.Error("Error updating instance's Status Subscription", log.Fields{
+			"error":          err,
+			"instanceID":     instanceId,
+			"subscriptionID": subId,
+		})
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+
+	w.Header().Set("Content-Type", "application/json")
+	w.WriteHeader(http.StatusOK)
+	err = json.NewEncoder(w).Encode(resp)
+	if err != nil {
+		log.Error("Error Marshaling Response", log.Fields{
+			"error":    err,
+			"response": resp,
+		})
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+}
+
+func (iss instanceStatusSubHandler) deleteHandler(w http.ResponseWriter, r *http.Request) {
+	vars := mux.Vars(r)
+	instanceId := vars["instID"]
+	subId := vars["subID"]
+
+	err := iss.client.Delete(instanceId, subId)
+	if err != nil {
+		log.Error("Error deleting instance's Status Subscription", log.Fields{
+			"error":          err,
+			"instanceID":     instanceId,
+			"subscriptionID": subId,
+		})
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+	w.WriteHeader(http.StatusAccepted)
+}
+
+func (iss instanceStatusSubHandler) listHandler(w http.ResponseWriter, r *http.Request) {
+	vars := mux.Vars(r)
+	id := vars["instID"]
+
+	resp, err := iss.client.List(id)
+	if err != nil {
+		log.Error("Error listing instance Status Subscriptions", log.Fields{
+			"error":       err,
+			"instance-id": id,
+		})
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+
+	w.Header().Set("Content-Type", "application/json")
+	w.WriteHeader(http.StatusOK)
+	err = json.NewEncoder(w).Encode(resp)
+	if err != nil {
+		log.Error("Error Marshaling Response", log.Fields{
+			"error":    err,
+			"response": resp,
+		})
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+}