ng2-idle-timeout
Version:
Zoneless-friendly session timeout management for Angular 16-20.
266 lines • 32.1 kB
JavaScript
import { DestroyRef, Injectable, NgZone, computed, inject, signal } from '@angular/core';
import { toObservable } from '@angular/core/rxjs-interop';
import { SESSION_TIMEOUT_CONFIG } from '../tokens/config.token';
import * as i0 from "@angular/core";
const HEARTBEAT_INTERVAL_MS = 1500;
const LEADER_TTL_MS = HEARTBEAT_INTERVAL_MS * 3;
export class LeaderElectionService {
destroyRef = inject(DestroyRef);
zone = inject(NgZone);
providedConfig = inject(SESSION_TIMEOUT_CONFIG, { optional: true });
leaderSignal = signal(null);
tabId = generateLeaderId();
storageKey = null;
heartbeatTimer = null;
watchdogTimer = null;
storage = this.resolveStorage();
isDisposed = false;
leaderId = this.leaderSignal.asReadonly();
isLeader = computed(() => this.leaderSignal() === this.tabId);
leader$ = toObservable(this.leaderId);
isLeader$ = toObservable(this.isLeader);
constructor() {
this.applyConfig(this.providedConfig);
if (!this.storage || !this.storageKey) {
return;
}
this.initialize();
}
updateConfig(config) {
this.applyConfig(config);
if (!this.storage || !this.storageKey || this.isDisposed) {
return;
}
this.evaluateLeadership();
}
electLeader() {
this.evaluateLeadership();
}
stepDown() {
if (!this.storage || !this.storageKey) {
return;
}
if (this.leaderSignal() === this.tabId) {
try {
const record = this.readLeaderRecord();
if (record?.id === this.tabId) {
this.storage.removeItem(this.storageKey);
}
}
catch (error) {
console.warn('[ng2-idle-timeout] Unable to release leader record', error);
}
}
this.stopHeartbeat();
this.leaderSignal.set(null);
}
initialize() {
this.destroyRef.onDestroy(() => {
this.cleanup();
});
this.evaluateLeadership();
this.startWatchdog();
if (typeof window !== 'undefined') {
window.addEventListener('storage', this.handleStorageEvent);
window.addEventListener('beforeunload', this.handleBeforeUnload);
}
}
cleanup() {
if (this.isDisposed) {
return;
}
this.isDisposed = true;
this.stopHeartbeat();
this.stopWatchdog();
if (typeof window !== 'undefined') {
window.removeEventListener('storage', this.handleStorageEvent);
window.removeEventListener('beforeunload', this.handleBeforeUnload);
}
}
handleBeforeUnload = () => {
this.stepDown();
};
handleStorageEvent = (event) => {
if (!this.storageKey || event.key !== this.storageKey) {
return;
}
this.zone.run(() => {
if (event.newValue == null) {
if (this.leaderSignal() !== this.tabId) {
this.leaderSignal.set(null);
}
return;
}
try {
const record = JSON.parse(event.newValue);
if (record.id === this.tabId) {
this.ensureHeartbeat();
this.leaderSignal.set(this.tabId);
}
else {
const now = Date.now();
if (now - record.updatedAt > LEADER_TTL_MS) {
this.evaluateLeadership();
return;
}
this.stopHeartbeat();
this.leaderSignal.set(record.id);
}
}
catch (error) {
console.warn('[ng2-idle-timeout] Invalid leader record from storage', error);
}
});
};
applyConfig(config) {
const storageKeyPrefix = config?.storageKeyPrefix ?? 'ng2-idle-timeout';
const appInstanceId = config?.appInstanceId ?? 'ng2-idle-timeout';
const nextKey = `${appInstanceId}:${storageKeyPrefix}:leader`;
if (this.storageKey === nextKey) {
return;
}
this.storageKey = nextKey;
if (this.storage) {
this.evaluateLeadership();
}
}
resolveStorage() {
if (typeof window === 'undefined') {
return null;
}
try {
return window.localStorage;
}
catch (error) {
console.warn('[ng2-idle-timeout] Leader election storage unavailable', error);
return null;
}
}
evaluateLeadership() {
if (!this.storage || !this.storageKey || this.isDisposed) {
return;
}
const record = this.readLeaderRecord();
const now = Date.now();
if (record?.id === this.tabId) {
this.leaderSignal.set(this.tabId);
this.ensureHeartbeat();
return;
}
if (!record || now - record.updatedAt > LEADER_TTL_MS) {
this.claimLeadership();
return;
}
this.leaderSignal.set(record.id);
this.stopHeartbeat();
}
claimLeadership() {
if (!this.storage || !this.storageKey || this.isDisposed) {
return;
}
const record = {
id: this.tabId,
updatedAt: Date.now()
};
try {
this.storage.setItem(this.storageKey, JSON.stringify(record));
this.leaderSignal.set(this.tabId);
this.ensureHeartbeat();
}
catch (error) {
console.warn('[ng2-idle-timeout] Unable to persist leader record', error);
}
}
readLeaderRecord() {
if (!this.storage || !this.storageKey) {
return null;
}
try {
const raw = this.storage.getItem(this.storageKey);
if (!raw) {
return null;
}
return JSON.parse(raw);
}
catch (error) {
console.warn('[ng2-idle-timeout] Unable to read leader record', error);
return null;
}
}
startWatchdog() {
if (!this.storage || this.watchdogTimer != null || typeof window === 'undefined') {
return;
}
this.zone.runOutsideAngular(() => {
this.watchdogTimer = window.setInterval(() => {
this.zone.run(() => {
this.evaluateLeadership();
});
}, HEARTBEAT_INTERVAL_MS);
});
}
stopWatchdog() {
if (this.watchdogTimer != null && typeof window !== 'undefined') {
window.clearInterval(this.watchdogTimer);
}
this.watchdogTimer = null;
}
startHeartbeat() {
if (!this.storage || this.heartbeatTimer != null || typeof window === 'undefined') {
return;
}
if (!this.isLeader()) {
return;
}
this.zone.runOutsideAngular(() => {
this.heartbeatTimer = window.setInterval(() => {
this.zone.run(() => {
this.touchLeaderRecord();
});
}, HEARTBEAT_INTERVAL_MS);
});
}
ensureHeartbeat() {
if (this.heartbeatTimer == null) {
this.startHeartbeat();
}
}
stopHeartbeat() {
if (this.heartbeatTimer != null && typeof window !== 'undefined') {
window.clearInterval(this.heartbeatTimer);
}
this.heartbeatTimer = null;
}
touchLeaderRecord() {
if (!this.storage || !this.storageKey || this.isDisposed) {
return;
}
if (this.leaderSignal() !== this.tabId) {
this.stopHeartbeat();
return;
}
const record = {
id: this.tabId,
updatedAt: Date.now()
};
try {
this.storage.setItem(this.storageKey, JSON.stringify(record));
}
catch (error) {
console.warn('[ng2-idle-timeout] Unable to update leader heartbeat', error);
}
}
static ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "17.3.0", ngImport: i0, type: LeaderElectionService, deps: [], target: i0.ɵɵFactoryTarget.Injectable });
static ɵprov = i0.ɵɵngDeclareInjectable({ minVersion: "12.0.0", version: "17.3.0", ngImport: i0, type: LeaderElectionService, providedIn: 'root' });
}
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "17.3.0", ngImport: i0, type: LeaderElectionService, decorators: [{
type: Injectable,
args: [{ providedIn: 'root' }]
}], ctorParameters: () => [] });
function generateLeaderId() {
if (typeof crypto !== 'undefined' && typeof crypto.randomUUID === 'function') {
return crypto.randomUUID();
}
return Math.random().toString(36).slice(2);
}
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null = null;\r\n  private watchdogTimer: number | null = null;\r\n  private storage: Storage | null = this.resolveStorage();\r\n  private isDisposed = false;\r\n\r\n  readonly leaderId = this.leaderSignal.asReadonly();\r\n  readonly isLeader = computed(() => this.leaderSignal() === this.tabId);\r\n  readonly leader$ = toObservable(this.leaderId);\r\n  readonly isLeader$ = toObservable(this.isLeader);\r\n\r\n  constructor() {\r\n    this.applyConfig(this.providedConfig);\r\n\r\n    if (!this.storage || !this.storageKey) {\r\n      return;\r\n    }\r\n\r\n    this.initialize();\r\n  }\r\n\r\n  updateConfig(config: SessionTimeoutConfig): void {\r\n    this.applyConfig(config);\r\n    if (!this.storage || !this.storageKey || this.isDisposed) {\r\n      return;\r\n    }\r\n    this.evaluateLeadership();\r\n  }\r\n\r\n  electLeader(): void {\r\n    this.evaluateLeadership();\r\n  }\r\n\r\n  stepDown(): void {\r\n    if (!this.storage || !this.storageKey) {\r\n      return;\r\n    }\r\n\r\n    if (this.leaderSignal() === this.tabId) {\r\n      try {\r\n        const record = this.readLeaderRecord();\r\n        if (record?.id === this.tabId) {\r\n          this.storage.removeItem(this.storageKey);\r\n        }\r\n      } catch (error) {\r\n        console.warn('[ng2-idle-timeout] Unable to release leader record', error);\r\n      }\r\n    }\r\n\r\n    this.stopHeartbeat();\r\n    this.leaderSignal.set(null);\r\n  }\r\n\r\n  private initialize(): void {\r\n    this.destroyRef.onDestroy(() => {\r\n      this.cleanup();\r\n    });\r\n\r\n    this.evaluateLeadership();\r\n    this.startWatchdog();\r\n\r\n    if (typeof window !== 'undefined') {\r\n      window.addEventListener('storage', this.handleStorageEvent);\r\n      window.addEventListener('beforeunload', this.handleBeforeUnload);\r\n    }\r\n  }\r\n\r\n  private cleanup(): void {\r\n    if (this.isDisposed) {\r\n      return;\r\n    }\r\n    this.isDisposed = true;\r\n    this.stopHeartbeat();\r\n    this.stopWatchdog();\r\n    if (typeof window !== 'undefined') {\r\n      window.removeEventListener('storage', this.handleStorageEvent);\r\n      window.removeEventListener('beforeunload', this.handleBeforeUnload);\r\n    }\r\n  }\r\n\r\n  private readonly handleBeforeUnload = (): void => {\r\n    this.stepDown();\r\n  };\r\n\r\n  private readonly handleStorageEvent = (event: StorageEvent): void => {\r\n    if (!this.storageKey || event.key !== this.storageKey) {\r\n      return;\r\n    }\r\n\r\n    this.zone.run(() => {\r\n      if (event.newValue == null) {\r\n        if (this.leaderSignal() !== this.tabId) {\r\n          this.leaderSignal.set(null);\r\n        }\r\n        return;\r\n      }\r\n\r\n      try {\r\n        const record = JSON.parse(event.newValue) as LeaderRecord;\r\n        if (record.id === this.tabId) {\r\n          this.ensureHeartbeat();\r\n          this.leaderSignal.set(this.tabId);\r\n        } else {\r\n          const now = Date.now();\r\n          if (now - record.updatedAt > LEADER_TTL_MS) {\r\n            this.evaluateLeadership();\r\n            return;\r\n          }\r\n          this.stopHeartbeat();\r\n          this.leaderSignal.set(record.id);\r\n        }\r\n      } catch (error) {\r\n        console.warn('[ng2-idle-timeout] Invalid leader record from storage', error);\r\n      }\r\n    });\r\n  };\r\n\r\n  private applyConfig(config: SessionTimeoutConfig | undefined): void {\r\n    const storageKeyPrefix = config?.storageKeyPrefix ?? 'ng2-idle-timeout';\r\n    const appInstanceId = config?.appInstanceId ?? 'ng2-idle-timeout';\r\n    const nextKey = `${appInstanceId}:${storageKeyPrefix}:leader`;\r\n\r\n    if (this.storageKey === nextKey) {\r\n      return;\r\n    }\r\n\r\n    this.storageKey = nextKey;\r\n    if (this.storage) {\r\n      this.evaluateLeadership();\r\n    }\r\n  }\r\n\r\n  private resolveStorage(): Storage | null {\r\n    if (typeof window === 'undefined') {\r\n      return null;\r\n    }\r\n\r\n    try {\r\n      return window.localStorage;\r\n    } catch (error) {\r\n      console.warn('[ng2-idle-timeout] Leader election storage unavailable', error);\r\n      return null;\r\n    }\r\n  }\r\n\r\n  private evaluateLeadership(): void {\r\n    if (!this.storage || !this.storageKey || this.isDisposed) {\r\n      return;\r\n    }\r\n\r\n    const record = this.readLeaderRecord();\r\n    const now = Date.now();\r\n\r\n    if (record?.id === this.tabId) {\r\n      this.leaderSignal.set(this.tabId);\r\n      this.ensureHeartbeat();\r\n      return;\r\n    }\r\n\r\n    if (!record || now - record.updatedAt > LEADER_TTL_MS ) {\r\n      this.claimLeadership();\r\n      return;\r\n    }\r\n\r\n    this.leaderSignal.set(record.id);\r\n    this.stopHeartbeat();\r\n  }\r\n\r\n  private claimLeadership(): void {\r\n    if (!this.storage || !this.storageKey || this.isDisposed) {\r\n      return;\r\n    }\r\n\r\n    const record: LeaderRecord = {\r\n      id: this.tabId,\r\n      updatedAt: Date.now()\r\n    };\r\n\r\n    try {\r\n      this.storage.setItem(this.storageKey, JSON.stringify(record));\r\n      this.leaderSignal.set(this.tabId);\r\n      this.ensureHeartbeat();\r\n    } catch (error) {\r\n      console.warn('[ng2-idle-timeout] Unable to persist leader record', error);\r\n    }\r\n  }\r\n\r\n  private readLeaderRecord(): LeaderRecord | null {\r\n    if (!this.storage || !this.storageKey) {\r\n      return null;\r\n    }\r\n\r\n    try {\r\n      const raw = this.storage.getItem(this.storageKey);\r\n      if (!raw) {\r\n        return null;\r\n      }\r\n      return JSON.parse(raw) as LeaderRecord;\r\n    } catch (error) {\r\n      console.warn('[ng2-idle-timeout] Unable to read leader record', error);\r\n      return null;\r\n    }\r\n  }\r\n\r\n  private startWatchdog(): void {\r\n    if (!this.storage || this.watchdogTimer != null || typeof window === 'undefined') {\r\n      return;\r\n    }\r\n\r\n    this.zone.runOutsideAngular(() => {\r\n      this.watchdogTimer = window.setInterval(() => {\r\n        this.zone.run(() => {\r\n          this.evaluateLeadership();\r\n        });\r\n      }, HEARTBEAT_INTERVAL_MS);\r\n    });\r\n  }\r\n\r\n  private stopWatchdog(): void {\r\n    if (this.watchdogTimer != null && typeof window !== 'undefined') {\r\n      window.clearInterval(this.watchdogTimer);\r\n    }\r\n    this.watchdogTimer = null;\r\n  }\r\n\r\n  private startHeartbeat(): void {\r\n    if (!this.storage || this.heartbeatTimer != null || typeof window === 'undefined') {\r\n      return;\r\n    }\r\n\r\n    if (!this.isLeader()) {\r\n      return;\r\n    }\r\n\r\n    this.zone.runOutsideAngular(() => {\r\n      this.heartbeatTimer = window.setInterval(() => {\r\n        this.zone.run(() => {\r\n          this.touchLeaderRecord();\r\n        });\r\n      }, HEARTBEAT_INTERVAL_MS);\r\n    });\r\n  }\r\n\r\n  private ensureHeartbeat(): void {\r\n    if (this.heartbeatTimer == null) {\r\n      this.startHeartbeat();\r\n    }\r\n  }\r\n\r\n  private stopHeartbeat(): void {\r\n    if (this.heartbeatTimer != null && typeof window !== 'undefined') {\r\n      window.clearInterval(this.heartbeatTimer);\r\n    }\r\n    this.heartbeatTimer = null;\r\n  }\r\n\r\n  private touchLeaderRecord(): void {\r\n    if (!this.storage || !this.storageKey || this.isDisposed) {\r\n      return;\r\n    }\r\n\r\n    if (this.leaderSignal() !== this.tabId) {\r\n      this.stopHeartbeat();\r\n      return;\r\n    }\r\n\r\n    const record: LeaderRecord = {\r\n      id: this.tabId,\r\n      updatedAt: Date.now()\r\n    };\r\n\r\n    try {\r\n      this.storage.setItem(this.storageKey, JSON.stringify(record));\r\n    } catch (error) {\r\n      console.warn('[ng2-idle-timeout] Unable to update leader heartbeat', error);\r\n    }\r\n  }\r\n}\r\n\r\nfunction generateLeaderId(): string {\r\n  if (typeof crypto !== 'undefined' && typeof crypto.randomUUID === 'function') {\r\n    return crypto.randomUUID();\r\n  }\r\n  return Math.random().toString(36).slice(2);\r\n}\r\n"]}