Make datastore generic to support Consul/Cassandra

This patch makes the backend datastore to be generic so that the
backend datastore can be either Consul or Cassandra. This way,
MUSIC's core functionality can be used and makes other minor fixes.

Change-Id: Iba4eaa751fe60a293d6f2fd60ad06a8c4be1dd1e
Issue-ID: MUSIC-55
Signed-off-by: Shashank Kumar Shankar <shashank.kumar.shankar@intel.com>

1 files changed, 87 insertions, 0 deletions

diff --git a/src/dkv/api/queryDatastoreHandlers.go b/src/dkv/api/queryDatastoreHandlers.go
new file mode 100644
index 0000000..4197ac0
--- /dev/null
+++ b/src/dkv/api/queryDatastoreHandlers.go
@@ -0,0 +1,87 @@
+/*
+ * Copyright 2018 Intel Corporation, Inc
+ *
+ * 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"
+	"github.com/gorilla/mux"
+	"net/http"
+)
+
+type ResponseStringStruct struct {
+	Response string `json:"response"`
+}
+
+type ResponseGETStruct struct {
+	Response map[string]string `json:"response"`
+}
+
+type ResponseGETSStruct struct {
+	Response []string `json:"response"`
+}
+
+func HandleGET(w http.ResponseWriter, r *http.Request) {
+	vars := mux.Vars(r)
+	key := vars["token"] + "/" + vars["key"]
+
+	value, err := Datastore.RequestGET(key)
+
+	if err != nil {
+		req := ResponseStringStruct{Response: string(err.Error())}
+		w.Header().Set("Content-Type", "application/json")
+		w.WriteHeader(http.StatusBadRequest)
+		json.NewEncoder(w).Encode(req)
+	} else {
+		req := ResponseGETStruct{Response: map[string]string{key: value}}
+		w.Header().Set("Content-Type", "application/json")
+		json.NewEncoder(w).Encode(req)
+	}
+}
+
+func HandleGETS(w http.ResponseWriter, r *http.Request) {
+
+	values, err := Datastore.RequestGETS()
+
+	if err != nil {
+		req := ResponseStringStruct{Response: string(err.Error())}
+		w.Header().Set("Content-Type", "application/json")
+		w.WriteHeader(http.StatusBadRequest)
+		json.NewEncoder(w).Encode(req)
+	} else {
+		req := ResponseGETSStruct{Response: values}
+		w.Header().Set("Content-Type", "application/json")
+		json.NewEncoder(w).Encode(req)
+	}
+}
+
+func HandleDELETE(w http.ResponseWriter, r *http.Request) {
+	vars := mux.Vars(r)
+	key := vars["key"]
+
+	err := Datastore.RequestDELETE(key)
+
+	if err != nil {
+		req := ResponseStringStruct{Response: string(err.Error())}
+		w.Header().Set("Content-Type", "application/json")
+		w.WriteHeader(http.StatusBadRequest)
+		json.NewEncoder(w).Encode(req)
+	} else {
+		req := ResponseStringStruct{Response: "Key deletion successful."}
+		w.Header().Set("Content-Type", "application/json")
+		json.NewEncoder(w).Encode(&req)
+	}
+}