Add health check api (#68)

* Add health check api

Signed-off-by: Masudur Rahman <masud@appscode.com>

* Add test for health check api

Signed-off-by: Masudur Rahman <masud@appscode.com>

* Update health check api

Signed-off-by: Masudur Rahman <masud@appscode.com>

* Update HealthResponse struct and test

Signed-off-by: Masudur Rahman <masud@appscode.com>

rest-get_health.go

@@ -0,0 +1,49 @@
+package sdk
+
+/*
+   Copyright 2016 Alexander I.Grafov <grafov@gmail.com>
+   Copyright 2016-2019 The Grafana SDK authors
+
+   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.
+
+   ॐ तारे तुत्तारे तुरे स्व
+*/
+
+import (
+	"encoding/json"
+)
+
+// HealthResponse represents the health of grafana server
+type HealthResponse struct {
+	Commit   string `json:"commit"`
+	Database string `json:"database"`
+	Version  string `json:"version"`
+}
+
+// GetHealth retrieves the health of the grafana server
+// Reflects GET BaseURL API call.
+func (r *Client) GetHealth() (HealthResponse, error) {
+	var (
+		raw []byte
+		err error
+	)
+	if raw, _, err = r.get("/api/health", nil); err != nil {
+		return HealthResponse{}, err
+	}
+
+	health := HealthResponse{}
+	if err := json.Unmarshal(raw, &health); err != nil {
+		return HealthResponse{}, err
+	}
+	return health, nil
+}

rest-get_health_integration_test.go

@@ -0,0 +1,18 @@
+package sdk_test
+
+import (
+	"testing"
+)
+
+func TestClient_GetHealth(t *testing.T) {
+	shouldSkip(t)
+	client := getClient(t)
+
+	health, err := client.GetHealth()
+	if err != nil {
+		t.Fatal(err)
+	}
+	if health.Database != "ok" {
+		t.Fatalf("expected `Database` to be %v, got %v.", "ok", health.Database)
+	}
+}