admin: Add version to service Status API response (#3605)

Add server's version field to service status API:

"version":{
	"version":"DEVELOPMENT.GOGET",
	"commitID":"DEVELOPMENT.GOGET"
}

cmd/admin-handlers.go

@@ -46,6 +46,18 @@ const (
 	mgmtDryRun    mgmtQueryKey = "dry-run"
 )
 
+// ServerVersion - server version
+type ServerVersion struct {
+	Version  string `json:"version"`
+	CommitID string `json:"commitID"`
+}
+
+// ServerStatus - contains the response of service status API
+type ServerStatus struct {
+	StorageInfo   StorageInfo   `json:"storageInfo"`
+	ServerVersion ServerVersion `json:"serverVersion"`
+}
+
 // ServiceStatusHandler - GET /?service
 // HTTP header x-minio-operation: status
 // ----------
@@ -57,8 +69,20 @@ func (adminAPI adminAPIHandlers) ServiceStatusHandler(w http.ResponseWriter, r *
 		writeErrorResponse(w, adminAPIErr, r.URL)
 		return
 	}
+
+	// Fetch storage backend information
 	storageInfo := newObjectLayerFn().StorageInfo()
-	jsonBytes, err := json.Marshal(storageInfo)
+	// Fetch server version
+	serverVersion := ServerVersion{Version: Version, CommitID: CommitID}
+
+	// Create API response
+	serverStatus := ServerStatus{
+		StorageInfo:   storageInfo,
+		ServerVersion: serverVersion,
+	}
+
+	// Marshal API response
+	jsonBytes, err := json.Marshal(serverStatus)
 	if err != nil {
 		writeErrorResponse(w, ErrInternalError, r.URL)
 		errorIf(err, "Failed to marshal storage info into json.")

cmd/admin-handlers_test.go

@@ -227,8 +227,11 @@ func testServicesCmdHandler(cmd cmdType, args map[string]interface{}, t *testing
 	adminTestBed.mux.ServeHTTP(rec, req)
 
 	if cmd == statusCmd {
-		expectedInfo := newObjectLayerFn().StorageInfo()
-		receivedInfo := StorageInfo{}
+		expectedInfo := ServerStatus{
+			StorageInfo:   newObjectLayerFn().StorageInfo(),
+			ServerVersion: ServerVersion{Version: Version, CommitID: CommitID},
+		}
+		receivedInfo := ServerStatus{}
 		if jsonErr := json.Unmarshal(rec.Body.Bytes(), &receivedInfo); jsonErr != nil {
 			t.Errorf("Failed to unmarshal StorageInfo - %v", jsonErr)
 		}

docs/admin-api/management-api.md

@@ -25,7 +25,7 @@
 * Status
   - GET /?service
   - x-minio-operation: status
-  - Response: On success 200, return json formatted StorageInfo object.
+  - Response: On success 200, return json formatted object which contains StorageInfo and ServerVersion structures
 
 * SetCredentials
   - GET /?service

pkg/madmin/API.md

@@ -74,9 +74,11 @@ Fetch service status, replies disk space used, backend type and total disks offl
 
 | Param  | Type  | Description  |
 |---|---|---|
-|`st.Total`  | _int64_  | Total disk space. |
-|`st.Free`  | _int64_  | Free disk space. |
-|`st.Backend`| _struct{}_ | Represents backend type embedded structure. |
+|`st.ServerVersion.Version`  | _string_  | Server version. |
+|`st.ServerVersion.CommitID`  | _string_  | Server commit id. |
+|`st.StorageInfo.Total`  | _int64_  | Total disk space. |
+|`st.StorageInfo.Free`  | _int64_  | Free disk space. |
+|`st.StorageInfo.Backend`| _struct{}_ | Represents backend type embedded structure. |
 
 | Param | Type | Description |
 |---|---|---|

pkg/madmin/service.go

@@ -41,8 +41,8 @@ const (
 	// Add your own backend.
 )
 
-// ServiceStatusMetadata - represents total capacity of underlying storage.
-type ServiceStatusMetadata struct {
+// StorageInfo - represents total capacity of underlying storage.
+type StorageInfo struct {
 	// Total disk space.
 	Total int64
 	// Free available disk space.
@@ -60,10 +60,23 @@ type ServiceStatusMetadata struct {
 	}
 }
 
+// ServerVersion - server version
+type ServerVersion struct {
+	Version  string `json:"version"`
+	CommitID string `json:"commitID"`
+}
+
+// ServiceStatusMetadata - contains the response of service status API
+type ServiceStatusMetadata struct {
+	StorageInfo   StorageInfo   `json:"storageInfo"`
+	ServerVersion ServerVersion `json:"serverVersion"`
+}
+
 // ServiceStatus - Connect to a minio server and call Service Status Management API
 // to fetch server's storage information represented by ServiceStatusMetadata structure
 func (adm *AdminClient) ServiceStatus() (ServiceStatusMetadata, error) {
 
+	// Prepare web service request
 	reqData := requestData{}
 	reqData.queryValues = make(url.Values)
 	reqData.queryValues.Set("service", "")
@@ -72,29 +85,30 @@ func (adm *AdminClient) ServiceStatus() (ServiceStatusMetadata, error) {
 
 	// Execute GET on bucket to list objects.
 	resp, err := adm.executeMethod("GET", reqData)
-
 	defer closeResponse(resp)
 	if err != nil {
 		return ServiceStatusMetadata{}, err
 	}
 
+	// Check response http status code
 	if resp.StatusCode != http.StatusOK {
 		return ServiceStatusMetadata{}, errors.New("Got HTTP Status: " + resp.Status)
 	}
 
+	// Unmarshal the server's json response
+	var serviceStatus ServiceStatusMetadata
+
 	respBytes, err := ioutil.ReadAll(resp.Body)
 	if err != nil {
 		return ServiceStatusMetadata{}, err
 	}
 
-	var storageInfo ServiceStatusMetadata
-
-	err = json.Unmarshal(respBytes, &storageInfo)
+	err = json.Unmarshal(respBytes, &serviceStatus)
 	if err != nil {
 		return ServiceStatusMetadata{}, err
 	}
 
-	return storageInfo, nil
+	return serviceStatus, nil
 }
 
 // ServiceRestart - Call Service Restart API to restart a specified Minio server