Provide Query API for CNF Instances

Query API doesn't directly use Status API code, in order to allow for
querying derived resources that might not be typically returned by
Status API like replicasets for deployment.

Issue-ID: MULTICLOUD-1305
Signed-off-by: Konrad Bańka <k.banka@samsung.com>
Change-Id: If15adce23845880f3e6771cc8eab78a78ab13517

2 files changed, 52 insertions, 0 deletions

diff --git a/src/k8splugin/api/api.go b/src/k8splugin/api/api.go
index c836fc65..e55d833b 100644
--- a/src/k8splugin/api/api.go
+++ b/src/k8splugin/api/api.go
@@ -1,5 +1,6 @@
 /*
 Copyright 2018 Intel Corporation.
+Copyright © 2021 Samsung Electronics
 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
@@ -47,6 +48,11 @@ func NewRouter(defClient rb.DefinitionManager,
 
 	instRouter.HandleFunc("/instance/{instID}", instHandler.getHandler).Methods("GET")
 	instRouter.HandleFunc("/instance/{instID}/status", instHandler.statusHandler).Methods("GET")
+	instRouter.HandleFunc("/instance/{instID}/query", instHandler.queryHandler).
+		Queries("ApiVersion", "{ApiVersion}",
+			"Kind", "{Kind}",
+			"Name", "{Name}",
+			"Labels", "{Labels}").Methods("GET")
 	instRouter.HandleFunc("/instance/{instID}", instHandler.deleteHandler).Methods("DELETE")
 	// (TODO): Fix update method
 	// instRouter.HandleFunc("/{vnfInstanceId}", UpdateHandler).Methods("PUT")
diff --git a/src/k8splugin/api/instancehandler.go b/src/k8splugin/api/instancehandler.go
index b0437426..b56a8e12 100644
--- a/src/k8splugin/api/instancehandler.go
+++ b/src/k8splugin/api/instancehandler.go
@@ -1,5 +1,6 @@
 /*
 Copyright 2018 Intel Corporation.
+Copyright © 2021 Samsung Electronics
 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
@@ -171,6 +172,51 @@ func (i instanceHandler) statusHandler(w http.ResponseWriter, r *http.Request) {
 	}
 }
 
+// queryHandler retrieves information about specified resources for instance
+func (i instanceHandler) queryHandler(w http.ResponseWriter, r *http.Request) {
+	vars := mux.Vars(r)
+	id := vars["instID"]
+	apiVersion := r.FormValue("ApiVersion")
+	kind := r.FormValue("Kind")
+	name := r.FormValue("Name")
+	labels := r.FormValue("Labels")
+	if apiVersion == "" {
+		http.Error(w, "Missing apiVersion mandatory parameter", http.StatusBadRequest)
+		return
+	}
+	if kind == "" {
+		http.Error(w, "Missing kind mandatory parameter", http.StatusBadRequest)
+		return
+	}
+	if name == "" && labels == "" {
+		http.Error(w, "Name or Labels parameter must be provided", http.StatusBadRequest)
+		return
+	}
+	resp, err := i.client.Query(id, apiVersion, kind, name, labels)
+	if err != nil {
+		log.Error("Error getting Query results", log.Fields{
+			"error":      err,
+			"id":         id,
+			"apiVersion": apiVersion,
+			"kind":       kind,
+			"name":       name,
+			"labels":     labels,
+		})
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+	}
+	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
+	}
+}
+
 // listHandler retrieves information about an instance via the ID
 func (i instanceHandler) listHandler(w http.ResponseWriter, r *http.Request) {