Adding healthcheck for OOM testing

Add a heathcheck endpoint for OOM testing

Issue-ID: ONAPARC-363
Change-Id: Id5f77478d331fedb19ac162389d95852e10c5022
Signed-off-by: Kiran Kamineni <kiran.k.kamineni@intel.com>

4 files changed, 100 insertions, 0 deletions

diff --git a/src/k8splugin/api/api.go b/src/k8splugin/api/api.go
index 741c0639..5fed28a0 100644
--- a/src/k8splugin/api/api.go
+++ b/src/k8splugin/api/api.go
@@ -101,5 +101,8 @@ func NewRouter(defClient rb.DefinitionManager,
 	resRouter.HandleFunc("/definition/{rbname}/{rbversion}/profile/{prname}/config/rollback", configHandler.rollbackHandler).Methods("POST")
 	resRouter.HandleFunc("/definition/{rbname}/{rbversion}/profile/{prname}/config/tagit", configHandler.tagitHandler).Methods("POST")
 
+	// Add healthcheck path
+	instRouter.HandleFunc("/healthcheck", healthCheckHandler).Methods("GET")
+
 	return router
 }
diff --git a/src/k8splugin/api/healthcheckhandler.go b/src/k8splugin/api/healthcheckhandler.go
new file mode 100644
index 00000000..79b7b7ef
--- /dev/null
+++ b/src/k8splugin/api/healthcheckhandler.go
@@ -0,0 +1,35 @@
+/*
+ * 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 (
+	"net/http"
+
+	"k8splugin/internal/db"
+)
+
+// healthCheckHandler executes a db read to return health of k8splugin
+// and its backing database
+func healthCheckHandler(w http.ResponseWriter, r *http.Request) {
+	err := db.DBconn.HealthCheck()
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+
+	w.WriteHeader(http.StatusOK)
+}
diff --git a/src/k8splugin/api/healthcheckhandler_test.go b/src/k8splugin/api/healthcheckhandler_test.go
new file mode 100644
index 00000000..c2e1888e
--- /dev/null
+++ b/src/k8splugin/api/healthcheckhandler_test.go
@@ -0,0 +1,58 @@
+/*
+ * 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 (
+	"net/http"
+	"net/http/httptest"
+	"testing"
+
+	"k8splugin/internal/db"
+
+	pkgerrors "github.com/pkg/errors"
+)
+
+// healthCheckHandler executes a db read to return health of k8splugin
+// and its backing database
+func TestHealthCheckHandler(t *testing.T) {
+
+	t.Run("OK HealthCheck", func(t *testing.T) {
+		db.DBconn = &db.MockDB{
+			Err: nil,
+		}
+		request := httptest.NewRequest("GET", "/v1/healthcheck", nil)
+		resp := executeRequest(request, NewRouter(nil, nil, nil, nil, nil))
+
+		//Check returned code
+		if resp.StatusCode != http.StatusOK {
+			t.Fatalf("Expected %d; Got: %d", http.StatusOK, resp.StatusCode)
+		}
+	})
+
+	t.Run("FAILED HealthCheck", func(t *testing.T) {
+		db.DBconn = &db.MockDB{
+			Err: pkgerrors.New("Runtime Error in DB"),
+		}
+		request := httptest.NewRequest("GET", "/v1/healthcheck", nil)
+		resp := executeRequest(request, NewRouter(nil, nil, nil, nil, nil))
+
+		//Check returned code
+		if resp.StatusCode != http.StatusInternalServerError {
+			t.Fatalf("Expected %d; Got: %d", http.StatusInternalServerError, resp.StatusCode)
+		}
+	})
+}
diff --git a/src/k8splugin/internal/db/testing.go b/src/k8splugin/internal/db/testing.go
index 1fefd63c..5f69dcb4 100644
--- a/src/k8splugin/internal/db/testing.go
+++ b/src/k8splugin/internal/db/testing.go
@@ -35,6 +35,10 @@ type MockDB struct {
 	Err   error
 }
 
+func (m *MockDB) HealthCheck() error {
+	return m.Err
+}
+
 func (m *MockDB) Create(table string, key Key, tag string, data interface{}) error {
 	return m.Err
 }