Fix statistics records trimming

src/Container.ts

@@ -5,6 +5,8 @@ import { ActionQueue } from './Queue/ActionQueue';
 import { Executor } from './Executor';
 import { ControlPanel } from './ControlPanel';
 import { DataStorageTaskProvider } from './Queue/DataStorageTaskProvider';
+import { Statistics } from './Statistics';
+import { StatisticsStorage } from './Storage/StatisticsStorage';
 
 export class Container {
     private readonly version: string;
@@ -33,7 +35,7 @@ export class Container {
         this._executor =
             this._executor ||
             (() => {
-                return new Executor(this.version, this.scheduler);
+                return new Executor(this.version, this.scheduler, this.statistics);
             })();
         return this._executor;
     }
@@ -48,4 +50,15 @@ export class Container {
             })();
         return this._controlPanel;
     }
+
+    private _statistics: Statistics | undefined;
+
+    get statistics(): Statistics {
+        this._statistics =
+            this._statistics ||
+            (() => {
+                return new Statistics(new StatisticsStorage());
+            })();
+        return this._statistics;
+    }
 }

src/Executor.ts

@@ -23,11 +23,11 @@ export class Executor {
     private executionState: ExecutionStorage;
     private logger: Logger;
 
-    constructor(version: string, scheduler: Scheduler) {
+    constructor(version: string, scheduler: Scheduler, statistics: Statistics) {
         this.version = version;
         this.scheduler = scheduler;
         this.grabbers = new GrabberManager();
-        this.statistics = new Statistics();
+        this.statistics = statistics;
         this.executionState = new ExecutionStorage();
         this.logger = new ConsoleLogger(this.constructor.name);
     }
@@ -103,7 +103,7 @@ export class Executor {
             throw new ActionError(`Action task id ${cmd.args.taskId} not equal current task id ${task.id}`);
         }
         if (actionHandler) {
-            this.statistics.incrementAction();
+            this.statistics.incrementAction(timestamp());
             await actionHandler.run(cmd.args, task);
         } else {
             this.logger.warn('ACTION NOT FOUND', cmd.name);

src/Statistics.ts

@@ -1,25 +1,54 @@
-import { StatisticsStorage } from './Storage/StatisticsStorage';
 import * as dateFormat from 'dateformat';
 
+const KEY_FORMAT = 'yyyy-mm-dd-HH';
+const KEEP_RECORD_COUNT = 24;
+
 export interface ActionStatistics {
     [key: string]: number;
 }
 
-export class Statistics {
-    private state: StatisticsStorage;
+export interface StatisticsStorageInterface {
+    getActionStatistics(): ActionStatistics;
+    setActionStatistics(statistics: ActionStatistics): void;
+}
 
-    constructor() {
-        this.state = new StatisticsStorage();
+export class Statistics {
+    private state: StatisticsStorageInterface;
+
+    static readonly keepRecords = KEEP_RECORD_COUNT;
+
+    constructor(storage: StatisticsStorageInterface) {
+        this.state = storage;
     }
 
-    incrementAction(): void {
+    incrementAction(ts: number): void {
         const stat = this.state.getActionStatistics();
-        const key = dateFormat(Date.now(), 'yyyy-mm-dd-HH');
+        const key = dateFormat(ts * 1000, KEY_FORMAT);
         stat[key] = (stat[key] || 0) + 1;
+        this.trimStatistics(stat);
         this.state.setActionStatistics(stat);
     }
 
+    private trimStatistics(stat: ActionStatistics) {
+        const topKeys = this.getTopStatKeys(stat);
+        const statKeys = Object.keys(stat);
+        for (let key of statKeys) {
+            if (!topKeys.includes(key)) {
+                delete stat[key];
+            }
+        }
+        return stat;
+    }
+
+    private getTopStatKeys(stat: ActionStatistics) {
+        const keys = Object.keys(stat);
+        return keys
+            .sort()
+            .reverse()
+            .slice(0, KEEP_RECORD_COUNT);
+    }
+
     getActionStatistics(): ActionStatistics {
-        return {};
+        return this.state.getActionStatistics();
     }
 }

src/Storage/StatisticsStorage.ts

@@ -1,11 +1,11 @@
 import { DataStorage } from '../DataStorage';
-import { ActionStatistics } from '../Statistics';
+import { ActionStatistics, StatisticsStorageInterface } from '../Statistics';
 
 const NAMESPACE = 'statistics.v1';
 
 const ACTION_STATISTICS_KEY = 'actions';
 
-export class StatisticsStorage {
+export class StatisticsStorage implements StatisticsStorageInterface {
     private storage: DataStorage;
     constructor() {
         this.storage = new DataStorage(NAMESPACE);

src/utils.ts

@@ -115,6 +115,10 @@ export function notify(msg: string): void {
     setTimeout(() => n && n.close(), 4000);
 }
 
+export interface NowTimeGenerator {
+    (): number;
+}
+
 export function markPage(text: string, version: string) {
     jQuery('body').append(
         '<div style="' +