diff --git a/analytics/analytic_unit_worker.py b/analytics/analytic_unit_worker.py
index 63c19d6..f3e1584 100644
--- a/analytics/analytic_unit_worker.py
+++ b/analytics/analytic_unit_worker.py
@@ -34,7 +34,7 @@ class AnalyticUnitWorker(object):
         except Exception as e:
             #traceback.extract_stack()
             error_text = traceback.format_exc()
-            logger.error("Exception: '%s'" % error_text)
+            logger.error("do_task Exception: '%s'" % error_text)
             # TODO: move result to a class which renders to json for messaging to analytics
             result = {
                 'task': type,
@@ -53,7 +53,7 @@ class AnalyticUnitWorker(object):
         if pattern == 'drop' and len(segments) == 0:
             # TODO: move result to a class which renders to json for messaging to analytics
             result = {
-                'status': 'success',
+                'status': 'SUCCESS',
                 'analyticUnitId': analytic_unit_id,
                 'segments': [],
                 'lastPredictionTime': last_prediction_time
@@ -69,8 +69,8 @@ class AnalyticUnitWorker(object):
         model.synchronize_data()
         segments, last_prediction_time = await model.predict(last_prediction_time)
         return {
-            'task': "predict",
-            'status': "success",
+            'task': 'PREDICT',
+            'status': 'SUCCESS',
             'analyticUnitId': analytic_unit_id,
             'segments': segments,
             'lastPredictionTime': last_prediction_time
@@ -78,7 +78,7 @@ class AnalyticUnitWorker(object):
 
     def get_model(self, analytic_unit_id, pattern_type):
         if analytic_unit_id not in self.models_cache:
-            if pattern_type == 'general':
+            if pattern_type == 'GENERAL':
                 model = detectors.GeneralDetector(analytic_unit_id)
             else:
                 model = detectors.PatternDetector(analytic_unit_id, pattern_type)
diff --git a/analytics/server.py b/analytics/server.py
index dcf0952..7818167 100644
--- a/analytics/server.py
+++ b/analytics/server.py
@@ -11,9 +11,9 @@ from analytic_unit_worker import AnalyticUnitWorker
 root = logging.getLogger()
 logger = logging.getLogger('SERVER')
 
-worker = None
-server_service = None
-data_service = None
+worker: AnalyticUnitWorker = None
+server_service: services.ServerService = None
+data_service: services.DataService = None
 
 root.setLevel(logging.DEBUG)
 
@@ -28,29 +28,40 @@ logging_handler.setFormatter(logging_formatter)
 root.addHandler(logging_handler)
 
 
-async def handle_task(text):
+async def handle_task(payload: str):
     try:
-        task = json.loads(text)
+        task = json.loads(payload)
         logger.info("Command is OK")
 
-        await server_service.send_message(json.dumps({
+        response_task_payload = json.dumps({
             '_taskId': task['_taskId'],
             'task': task['type'],
             'analyticUnitId': task['analyticUnitId'],
             'status': "in progress"
-        }))
+        })
+
+        message = services.server_service.ServerMessage('TASK_RESULT', response_task_payload)
+
+        await server_service.send_message(message)
 
         res = await worker.do_task(task)
         res['_taskId'] = task['_taskId']
         await server_service.send_message(json.dumps(res))
 
     except Exception as e:
-        logger.error("Exception: '%s'" % str(e))
+        logger.error("handle_task Exception: '%s'" % str(e))
+
+async def handle_message(message: services.ServerMessage):
+    payload = None
+    if message.payload is not None:
+        payload = json.loads(message.payload)
+    if message.method == 'task':
+        await handle_task(payload)
 
 def init_services():
     logger.info("Starting services...")
     logger.info("Server...")
-    server_service = services.ServerService(handle_task)
+    server_service = services.ServerService(handle_message)
     logger.info("Ok")
     logger.info("Data service...")
     data_service = services.DataService(server_service)
@@ -58,6 +69,11 @@ def init_services():
 
     return server_service, data_service
 
+async def app_loop():
+    server_service.handle_loop()
+    # await asyncio.gather(server_service.handle_loop(), test_file_save())
+
+
 if __name__ == "__main__":
     loop = asyncio.get_event_loop()
     logger.info("Starting worker...")
@@ -66,4 +82,5 @@ if __name__ == "__main__":
     server_service, data_service = init_services()
     print('Analytics process is running') # we need to print to stdout and flush
     sys.stdout.flush()                    # because node.js expects it
-    loop.run_until_complete(server_service.handle_loop())
+
+    loop.run_until_complete(app_loop())
diff --git a/analytics/services/__init__.py b/analytics/services/__init__.py
index d7fb414..8f5f5a4 100644
--- a/analytics/services/__init__.py
+++ b/analytics/services/__init__.py
@@ -1,2 +1,2 @@
-from services.server_service import ServerService
+from services.server_service import ServerService, ServerMessage
 from services.data_service import DataService
diff --git a/analytics/services/data_service.py b/analytics/services/data_service.py
index a136b88..705e2a8 100644
--- a/analytics/services/data_service.py
+++ b/analytics/services/data_service.py
@@ -1,9 +1,87 @@
+from services.server_service import ServerMessage, ServerService
+
+import json
+import asyncio
+
+"""
+This is how you can save a file:
+
+async def test_file_save():
+    async with data_service.open('filename') as f:
+        print('write content')
+        await f.write('test string')
+
+    async with data_service.open('filename') as f:
+        content = await f.load()
+        print(content)
+    print('test file ok')
+"""
+
+
+LOCK_WAIT_SLEEP_TIMESPAN = 100 # mc
+
+class FileDescriptor:
+    def __init__(self, filename: str, data_service):
+        self.filename = filename
+        self.data_service = data_service
+
+    async def write(self, content: str):
+        await self.data_service.save_file_content(self, content)
+
+    async def load(self) -> str:
+        return await self.data_service.load_file_content(self)
+
+    async def __aenter__(self):
+        await self.data_service.wait_and_lock(self)
+        return self
+
+    async def __aexit__(self, *exc):
+        await self.data_service.unlock(self)
+
+
 class DataService:
-    def __init__(self, server_service):
+
+    def __init__(self, server_service: ServerService):
+        """Creates fs over network via server_service"""
         self.server_service = server_service
+        self.locks = set()
+
+    def open(self, filename: str) -> FileDescriptor:
+        return FileDescriptor(filename, self)
+
+    async def wait_and_lock(self, file_descriptor: FileDescriptor):
+        filename = file_descriptor.filename
+        while True:
+            if filename in self.locks:
+                asyncio.sleep(LOCK_WAIT_SLEEP_TIMESPAN)
+                continue
+            else:
+                self.locks.add(filename)
+                break
+
+    async def unlock(self, file_descriptor: FileDescriptor):
+        filename = file_descriptor.filename
+        self.locks.remove(filename)
+
+    async def save_file_content(self, file_descriptor: FileDescriptor, content: str):
+        """ Saves json - serializable obj with file_descriptor.filename """
+        self.__check_lock(file_descriptor)
+        message_payload = {
+            'filename': file_descriptor.filename,
+            'content': content
+        }
+        message = ServerMessage('FILE_SAVE', message_payload)
+        await self.server_service.send_request(message)
+
+    async def load_file_content(self, file_descriptor: FileDescriptor) -> str:
+        self.__check_lock(file_descriptor)
+        message_payload = { 'filename': file_descriptor.filename }
+        message = ServerMessage('FILE_LOAD', message_payload)
+        return await self.server_service.send_request(message)
+
+    def __check_lock(self, file_descriptor: FileDescriptor):
+        filename = file_descriptor.filename
+        if filename not in self.locks:
+            raise RuntimeError('No lock for file %s' % filename)
 
-    async def safe_file(filename, content):
-        pass
 
-    async def load_file(filename, content):
-        pass
\ No newline at end of file
diff --git a/analytics/services/server_service.py b/analytics/services/server_service.py
index a43bada..82caa40 100644
--- a/analytics/services/server_service.py
+++ b/analytics/services/server_service.py
@@ -2,13 +2,41 @@ import config
 
 import zmq
 import zmq.asyncio
-import logging
 
+import logging
+import json
 import asyncio
 
 logger = logging.getLogger('SERVER_SERVICE')
 
 
+class ServerMessage:
+    def __init__(self, method: str, payload: object = None, request_id: int = None):
+        self.method = method
+        self.payload = payload
+        self.request_id = request_id
+    
+    def toJSON(self):
+        result = {
+            'method': self.method   
+        }
+        if self.payload is not None:
+            result['payload'] = self.payload
+        if self.request_id is not None:
+            result['requestId'] = self.request_id
+        return result
+    
+    def fromJSON(json: dict):
+        method = json['method']
+        payload = None
+        request_id = None
+        if 'payload' in json:
+            payload = json['payload']
+        if 'requestId' in json:
+            request_id = json['requestId']
+        
+        return ServerMessage(method, payload, request_id)
+
 class ServerService:
 
     def __init__(self, on_message_handler):
@@ -18,25 +46,46 @@ class ServerService:
         self.context = zmq.asyncio.Context()
         self.socket = self.context.socket(zmq.PAIR)
         self.socket.bind(config.ZMQ_CONNECTION_STRING)
+        self.request_next_id = 1
+        self.responses = dict()
 
     async def handle_loop(self):
         while True:
             received_bytes = await self.socket.recv()
             text = received_bytes.decode('utf-8')
 
-            if text == 'ping':
+            if text == 'PING':
                 asyncio.ensure_future(self.__handle_ping())
             else:
                 asyncio.ensure_future(self.__handle_message(text))
 
-    async def send_message(self, string):
-        await self.socket.send_string(string)
+    async def send_message(self, message: ServerMessage):
+        await self.socket.send_string(json.dumps(message.toJSON()))
+    
+    async def send_request(self, message: ServerMessage) -> object:
+        if message.request_id is not None:
+            raise ValueError('Message can`t have request_id before it is scheduled')
+        request_id = message.request_id = self.request_next_id
+        self.request_next_id = self.request_next_id + 1
+        asyncio.ensure_future(self.send_message(message))
+        while request_id not in self.responses:
+            await asyncio.sleep(1)
+        response = self.responses[request_id]
+        del self.responses[request_id]
+        return response
 
     async def __handle_ping(self):
-        await self.socket.send(b'pong')
+        await self.socket.send(b'PONG')
 
-    async def __handle_message(self, text):
+    async def __handle_message(self, text: str):
         try:
-            asyncio.ensure_future(self.on_message_handler(text))
+            message_object = json.loads(text)
+            message = ServerMessage.fromJSON(message_object)
+            
+            if message.request_id is not None:
+                self.responses[message_object['requestId']] = message.payload
+                return
+
+            asyncio.ensure_future(self.on_message_handler(message))
         except Exception as e:
-            logger.error("Exception: '%s'" % str(e))
+            logger.error("__handle_message Exception: '%s'" % str(e))
diff --git a/server/package.json b/server/package.json
index dd92674..64d80f2 100644
--- a/server/package.json
+++ b/server/package.json
@@ -20,6 +20,7 @@
   "homepage": "https://github.com/hastic/hastic-server#readme",
   "dependencies": {},
   "devDependencies": {
+    "@types/es6-promisify": "^6.0.0",
     "@types/koa": "^2.0.45",
     "@types/koa-bodyparser": "^4.2.0",
     "@types/koa-router": "^7.0.28",
diff --git a/server/src/config.ts b/server/src/config.ts
index fc8f133..66930e4 100644
--- a/server/src/config.ts
+++ b/server/src/config.ts
@@ -13,6 +13,7 @@ export const DATA_PATH = path.join(__dirname, '../../data');
 export const ANALYTIC_UNITS_DATABASE_PATH = path.join(DATA_PATH, 'analyticUnits.db');
 export const METRICS_DATABASE_PATH = path.join(DATA_PATH, 'metrics.db');
 export const SEGMENTS_DATABASE_PATH = path.join(DATA_PATH, 'segments.db');
+export const FILES_DATABASE_PATH = path.join(DATA_PATH, 'files.db');
 
 export const DATASETS_PATH = path.join(DATA_PATH, 'datasets');
 export const ANALYTIC_UNITS_PATH = path.join(DATA_PATH, 'analytic_units');
diff --git a/server/src/controllers/analytics_controller.ts b/server/src/controllers/analytics_controller.ts
index aa3d77a..75ee87a 100644
--- a/server/src/controllers/analytics_controller.ts
+++ b/server/src/controllers/analytics_controller.ts
@@ -1,7 +1,8 @@
+import * as DataService from '../services/data_service';
 import { getTarget } from './metrics_controler';
-import { getLabeledSegments, insertSegments, removeSegments } from './segments_controller'
+import { getLabeledSegments, insertSegments, removeSegments } from './segments_controller';
 import * as AnalyticUnit from '../models/analytic_unit'
-import { AnalyticsService } from '../services/analytics_service'
+import { AnalyticsService, AnalyticsMessage } from '../services/analytics_service';
 
 
 const taskMap = {};
@@ -9,20 +10,58 @@ let nextTaskId = 0;
 
 let analyticsService = undefined;
 
-function onResponse(response: any) {
-  let taskId = response._taskId;
-  let status = response.status;
-  if(status === 'success' || status === 'failed') {
+
+function onTaskResult(taskResult: any) {
+  let taskId = taskResult._taskId;
+  let status = taskResult.status;
+  if(status === 'SUCCESS' || status === 'FAILED') {
     if(taskId in taskMap) {
       let resolver = taskMap[taskId];
-      resolver(response);
+      resolver(taskResult);
       delete taskMap[taskId];
     }
   }
 }
 
+async function onFileSave(payload: any): Promise<any> {
+  return DataService.saveFile(payload.filename, payload.content);
+}
+
+async function onFileLoad(payload: any): Promise<any> {
+  return DataService.loadFile(payload.filename);
+}
+
+async function onMessage(message: AnalyticsMessage) {
+  let responsePayload = null;
+  let resolvedMethod = false;
+
+  if(message.method === 'TASK_RESULT') {
+    onTaskResult(JSON.parse(message.payload));
+    resolvedMethod = true;
+  }
+
+  if(message.method === 'FILE_SAVE') {
+    responsePayload = await onFileSave(message.payload);
+    resolvedMethod = true;
+  }
+  if(message.method === 'FILE_LOAD') {
+    responsePayload = await onFileLoad(message.payload); 
+    resolvedMethod = true;
+  }
+
+  if(!resolvedMethod) {
+    throw new TypeError('Unknown method ' + message.method);
+  }
+
+  // TODO: catch exception and send error in this case
+  if(message.requestId !== undefined) {
+    message.payload = responsePayload;
+    analyticsService.sendMessage(message);
+  }
+}
+
 export function init() {
-  analyticsService = new AnalyticsService(onResponse);
+  analyticsService = new AnalyticsService(onMessage);
 }
 
 export function terminate() {
@@ -51,19 +90,19 @@ export async function runLearning(id: AnalyticUnit.AnalyticUnitId) {
   let pattern = unit.type;
   let task = {
     analyticUnitId: id,
-    type: 'learn',
+    type: 'LEARN',
     pattern,
     segments: segments
   };
 
   let result = await runTask(task);
 
-  if (result.status === 'success') {
-    AnalyticUnit.setStatus(id, 'ready');
+  if (result.status === 'SUCCESS') {
+    AnalyticUnit.setStatus(id, 'READY');
     insertSegments(id, result.segments, false);
     AnalyticUnit.setPredictionTime(id, result.lastPredictionTime);
   } else {
-    AnalyticUnit.setStatus(id, 'failed', result.error);
+    AnalyticUnit.setStatus(id, 'FAILED', result.error);
   }
 }
 
@@ -79,7 +118,7 @@ export async function runPredict(id: AnalyticUnit.AnalyticUnitId) {
   };
   let result = await runTask(task);
 
-  if(result.status === 'failed') {
+  if(result.status === 'FAILED') {
     return [];
   }
   // Merging segments
@@ -101,4 +140,4 @@ export async function runPredict(id: AnalyticUnit.AnalyticUnitId) {
 
 export function isAnalyticReady(): boolean {
   return analyticsService.ready;
-}
\ No newline at end of file
+}
diff --git a/server/src/index.ts b/server/src/index.ts
index 499d41f..a094837 100644
--- a/server/src/index.ts
+++ b/server/src/index.ts
@@ -35,8 +35,8 @@ rootRouter.use('/analyticUnits', anomaliesRouter.routes(), anomaliesRouter.allow
 rootRouter.use('/segments', segmentsRouter.routes(), segmentsRouter.allowedMethods());
 rootRouter.use('/alerts', alertsRouter.routes(), alertsRouter.allowedMethods());
 rootRouter.get('/', async (ctx) => {
-  ctx.response.body = { 
-    server: 'Ok', 
+  ctx.response.body = {
+    server: 'OK',
     analyticsReady: AnalyticsController.isAnalyticReady(),
     version: process.env.npm_package_version
   };
diff --git a/server/src/services/analytics_service.ts b/server/src/services/analytics_service.ts
index 703146d..210dd58 100644
--- a/server/src/services/analytics_service.ts
+++ b/server/src/services/analytics_service.ts
@@ -7,6 +7,23 @@ import * as fs from 'fs';
 import * as path from 'path';
 
 
+export class AnalyticsMessage {
+  public constructor(public method: string, public payload?: string, public requestId?: number) {
+
+  }
+
+  static fromJSON(obj: any): AnalyticsMessage {
+    if(obj.method === undefined) {
+      throw new Error('No method in obj:' + obj);
+    }
+    return new AnalyticsMessage(obj.method, obj.payload, obj.requestId);
+  }
+}
+
+function analyticsMessageFromJson(obj: any): AnalyticsMessage {
+  return new AnalyticsMessage(obj);
+}
+
 export class AnalyticsService {
 
   private _requester: any;
@@ -17,8 +34,7 @@ export class AnalyticsService {
   private _analyticsPinger: NodeJS.Timer = null;
   private _isClosed = false;
 
-
-  constructor(private _onResponse: (response: any) => void) {
+  constructor(private _onMessage: (message: AnalyticsMessage) => void) {
     this._init();
   }
 
@@ -26,13 +42,20 @@ export class AnalyticsService {
     if(!this._ready) {
       return Promise.reject("Analytics is not ready");
     }
-    let message = JSON.stringify(msgObj);
+    let message = {
+      method: 'task',
+      payload: JSON.stringify(msgObj)
+    }
     return this.sendMessage(message);
   }
 
-  public async sendMessage(message: string): Promise<void> {
+  public async sendMessage(message: AnalyticsMessage): Promise<void> {
+    let strMessage = JSON.stringify(message);
+    if(message.method === 'PING') {
+      strMessage = 'PING';
+    }
     return new Promise<void>((resolve, reject) => {
-      this._requester.send(message, undefined, (err) => {
+      this._requester.send(strMessage, undefined, (err) => {
         if(err) {
           reject(err);
         } else {
@@ -160,8 +183,8 @@ export class AnalyticsService {
     }
   }
 
-  private _onAnalyticsMessage(text: any, error) {
-    if(text.toString() === 'pong') {
+  private _onAnalyticsMessage(data: any, error) {
+    if(data.toString() === 'PONG') {
       this._pingResponded = true;
       if(!this._ready) {
         this._ready = true;
@@ -169,7 +192,9 @@ export class AnalyticsService {
       }
       return;
     }
-    console.log(`analytics message: "${text}"`);
+
+    
+    let text = data.toString();
     let response;
     try {
       response = JSON.parse(text);
@@ -178,7 +203,7 @@ export class AnalyticsService {
       console.error(text);
       throw new Error('Unexpected response');
     }
-    this._onResponse(response);
+    this._onMessage(AnalyticsMessage.fromJSON(response));
   }
 
   private async _runAlalyticsPinger() {
@@ -192,7 +217,7 @@ export class AnalyticsService {
       }
       this._pingResponded = false;
       // TODO: set life limit for this ping
-      this.sendMessage('ping');
+      this.sendMessage({ method: 'PING' });
     }, config.ANLYTICS_PING_INTERVAL);
   }
 
diff --git a/server/src/services/data_service.ts b/server/src/services/data_service.ts
index 24851b6..a6005ea 100644
--- a/server/src/services/data_service.ts
+++ b/server/src/services/data_service.ts
@@ -1,4 +1,4 @@
-import * as config from '../config'
+import * as config from '../config';
 
 import * as nedb from 'nedb';
 import * as fs from 'fs';
@@ -6,10 +6,42 @@ import * as fs from 'fs';
 export const db = {
   analyticUnits: new nedb({ filename: config.ANALYTIC_UNITS_DATABASE_PATH, autoload: true }),
   metrics: new nedb({ filename: config.METRICS_DATABASE_PATH, autoload: true }),
-  segments: new nedb({ filename: config.SEGMENTS_DATABASE_PATH, autoload: true })
+  segments: new nedb({ filename: config.SEGMENTS_DATABASE_PATH, autoload: true }),
+  files: new nedb({ filename: config.FILES_DATABASE_PATH, autoload: true })
 };
 
-// see analytics/pattern_detection_model.py with folders available
+
+let dbUpsertFile = (query: any, updateQuery: any) => {
+  return new Promise<void>((resolve, reject) => {
+    db.files.update(query, updateQuery, { upsert: true }, (err: Error) => {
+      if(err) {
+        reject(err);
+      } else {
+        console.log('saved shit with query ');
+        console.log(query);
+        console.log('saved shit with updateQuery ');
+        console.log(updateQuery);
+        resolve();
+      }
+    });
+  });
+}
+
+let dbLoadFile = (query: any) => {
+  return new Promise<any>((resolve, reject) => {
+    db.files.findOne(query, (err, doc) => {
+      if(err) {
+        reject(err);
+      } else {
+        console.log('got shit with query');
+        console.log(query);
+        console.log('doc');
+        console.log(doc);
+        resolve(doc);
+      }
+    });
+  });
+}
 
 function maybeCreate(path: string): void {
   if(fs.existsSync(path)) {
@@ -20,6 +52,18 @@ function maybeCreate(path: string): void {
   console.log('exists: ' + fs.existsSync(path));
 }
 
+export async function saveFile(filename: string, content: string): Promise<void> {
+  return dbUpsertFile({ filename } , { filename, content });
+}
+
+export async function loadFile(filename: string): Promise<string> {
+  let doc = await dbLoadFile({ filename });
+  if(doc === null) {
+    return null;
+  }
+  return doc.content;
+}
+
 export function checkDataFolders(): void {
   [
     config.DATA_PATH,