@angular/service-worker
Version:
Angular - service worker tooling!
84 lines • 18.5 kB
JavaScript
/**
* @license
* Copyright Google LLC All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
import { concat, defer, fromEvent, of, throwError } from 'rxjs';
import { filter, map, publish, switchMap, take, tap } from 'rxjs/operators';
export const ERR_SW_NOT_SUPPORTED = 'Service workers are disabled or not supported by this browser';
function errorObservable(message) {
return defer(() => throwError(new Error(message)));
}
/**
* @publicApi
*/
export class NgswCommChannel {
constructor(serviceWorker) {
this.serviceWorker = serviceWorker;
if (!serviceWorker) {
this.worker = this.events = this.registration = errorObservable(ERR_SW_NOT_SUPPORTED);
}
else {
const controllerChangeEvents = fromEvent(serviceWorker, 'controllerchange');
const controllerChanges = controllerChangeEvents.pipe(map(() => serviceWorker.controller));
const currentController = defer(() => of(serviceWorker.controller));
const controllerWithChanges = concat(currentController, controllerChanges);
this.worker = controllerWithChanges.pipe(filter((c) => !!c));
this.registration = (this.worker.pipe(switchMap(() => serviceWorker.getRegistration())));
const rawEvents = fromEvent(serviceWorker, 'message');
const rawEventPayload = rawEvents.pipe(map(event => event.data));
const eventsUnconnected = rawEventPayload.pipe(filter(event => event && event.type));
const events = eventsUnconnected.pipe(publish());
events.connect();
this.events = events;
}
}
postMessage(action, payload) {
return this.worker
.pipe(take(1), tap((sw) => {
sw.postMessage({
action,
...payload,
});
}))
.toPromise()
.then(() => undefined);
}
postMessageWithOperation(type, payload, operationNonce) {
const waitForOperationCompleted = this.waitForOperationCompleted(operationNonce);
const postMessage = this.postMessage(type, payload);
return Promise.all([postMessage, waitForOperationCompleted]).then(([, result]) => result);
}
generateNonce() {
return Math.round(Math.random() * 10000000);
}
eventsOfType(type) {
let filterFn;
if (typeof type === 'string') {
filterFn = (event) => event.type === type;
}
else {
filterFn = (event) => type.includes(event.type);
}
return this.events.pipe(filter(filterFn));
}
nextEventOfType(type) {
return this.eventsOfType(type).pipe(take(1));
}
waitForOperationCompleted(nonce) {
return this.eventsOfType('OPERATION_COMPLETED')
.pipe(filter(event => event.nonce === nonce), take(1), map(event => {
if (event.result !== undefined) {
return event.result;
}
throw new Error(event.error);
}))
.toPromise();
}
get isEnabled() {
return !!this.serviceWorker;
}
}
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* @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n\nimport {concat, ConnectableObservable, defer, fromEvent, Observable, of, throwError} from 'rxjs';\nimport {filter, map, publish, switchMap, take, tap} from 'rxjs/operators';\n\nexport const ERR_SW_NOT_SUPPORTED = 'Service workers are disabled or not supported by this browser';\n\n/**\n * An event emitted when a new version of the app is available.\n *\n * @see {@link guide/service-worker-communications Service worker communication guide}\n *\n * @deprecated\n * This event is only emitted by the deprecated {@link SwUpdate#available}.\n * Use the {@link VersionReadyEvent} instead, which is emitted by {@link SwUpdate#versionUpdates}.\n * See {@link SwUpdate#available} docs for an example.\n *\n * @publicApi\n */\nexport interface UpdateAvailableEvent {\n  type: 'UPDATE_AVAILABLE';\n  current: {hash: string, appData?: Object};\n  available: {hash: string, appData?: Object};\n}\n\n/**\n * An event emitted when a new version of the app has been downloaded and activated.\n *\n * @see {@link guide/service-worker-communications Service worker communication guide}\n *\n * @deprecated\n * This event is only emitted by the deprecated {@link SwUpdate#activated}.\n * Use the return value of {@link SwUpdate#activateUpdate} instead.\n *\n * @publicApi\n */\nexport interface UpdateActivatedEvent {\n  type: 'UPDATE_ACTIVATED';\n  previous?: {hash: string, appData?: Object};\n  current: {hash: string, appData?: Object};\n}\n\n/**\n * An event emitted when the service worker has checked the version of the app on the server and it\n * didn't find a new version that it doesn't have already downloaded.\n *\n * @see {@link guide/service-worker-communications Service worker communication guide}\n *\n * @publicApi\n */\nexport interface NoNewVersionDetectedEvent {\n  type: 'NO_NEW_VERSION_DETECTED';\n  version: {hash: string; appData?: Object;};\n}\n\n/**\n * An event emitted when the service worker has detected a new version of the app on the server and\n * is about to start downloading it.\n *\n * @see {@link guide/service-worker-communications Service worker communication guide}\n *\n * @publicApi\n */\nexport interface VersionDetectedEvent {\n  type: 'VERSION_DETECTED';\n  version: {hash: string; appData?: object;};\n}\n\n/**\n * An event emitted when the installation of a new version failed.\n * It may be used for logging/monitoring purposes.\n *\n * @see {@link guide/service-worker-communications Service worker communication guide}\n *\n * @publicApi\n */\nexport interface VersionInstallationFailedEvent {\n  type: 'VERSION_INSTALLATION_FAILED';\n  version: {hash: string; appData?: object;};\n  error: string;\n}\n\n/**\n * An event emitted when a new version of the app is available.\n *\n * @see {@link guide/service-worker-communications Service worker communication guide}\n *\n * @publicApi\n */\nexport interface VersionReadyEvent {\n  type: 'VERSION_READY';\n  currentVersion: {hash: string; appData?: object;};\n  latestVersion: {hash: string; appData?: object;};\n}\n\n\n/**\n * A union of all event types that can be emitted by\n * {@link api/service-worker/SwUpdate#versionUpdates SwUpdate#versionUpdates}.\n *\n * @publicApi\n */\nexport type VersionEvent =\n    VersionDetectedEvent|VersionInstallationFailedEvent|VersionReadyEvent|NoNewVersionDetectedEvent;\n\n/**\n * An event emitted when the version of the app used by the service worker to serve this client is\n * in a broken state that cannot be recovered from and a full page reload is required.\n *\n * For example, the service worker may not be able to retrieve a required resource, neither from the\n * cache nor from the server. This could happen if a new version is deployed to the server and the\n * service worker cache has been partially cleaned by the browser, removing some files of a previous\n * app version but not all.\n *\n * @see {@link guide/service-worker-communications Service worker communication guide}\n *\n * @publicApi\n */\nexport interface UnrecoverableStateEvent {\n  type: 'UNRECOVERABLE_STATE';\n  reason: string;\n}\n\n/**\n * An event emitted when a `PushEvent` is received by the service worker.\n */\nexport interface PushEvent {\n  type: 'PUSH';\n  data: any;\n}\n\nexport type IncomingEvent = UpdateActivatedEvent|UnrecoverableStateEvent|VersionEvent;\n\nexport interface TypedEvent {\n  type: string;\n}\n\ntype OperationCompletedEvent = {\n  type: 'OPERATION_COMPLETED'; nonce: number; result: boolean;\n}|{\n  type: 'OPERATION_COMPLETED';\n  nonce: number;\n  result?: undefined;\n  error: string;\n};\n\n\nfunction errorObservable(message: string): Observable<any> {\n  return defer(() => throwError(new Error(message)));\n}\n\n/**\n * @publicApi\n */\nexport class NgswCommChannel {\n  readonly worker: Observable<ServiceWorker>;\n\n  readonly registration: Observable<ServiceWorkerRegistration>;\n\n  readonly events: Observable<TypedEvent>;\n\n  constructor(private serviceWorker: ServiceWorkerContainer|undefined) {\n    if (!serviceWorker) {\n      this.worker = this.events = this.registration = errorObservable(ERR_SW_NOT_SUPPORTED);\n    } else {\n      const controllerChangeEvents = fromEvent(serviceWorker, 'controllerchange');\n      const controllerChanges = controllerChangeEvents.pipe(map(() => serviceWorker.controller));\n      const currentController = defer(() => of(serviceWorker.controller));\n      const controllerWithChanges = concat(currentController, controllerChanges);\n\n      this.worker = controllerWithChanges.pipe(filter((c): c is ServiceWorker => !!c));\n\n      this.registration = <Observable<ServiceWorkerRegistration>>(\n          this.worker.pipe(switchMap(() => serviceWorker.getRegistration())));\n\n      const rawEvents = fromEvent<MessageEvent>(serviceWorker, 'message');\n      const rawEventPayload = rawEvents.pipe(map(event => event.data));\n      const eventsUnconnected = rawEventPayload.pipe(filter(event => event && event.type));\n      const events = eventsUnconnected.pipe(publish()) as ConnectableObservable<IncomingEvent>;\n      events.connect();\n\n      this.events = events;\n    }\n  }\n\n  postMessage(action: string, payload: Object): Promise<void> {\n    return this.worker\n        .pipe(take(1), tap((sw: ServiceWorker) => {\n                sw.postMessage({\n                  action,\n                  ...payload,\n                });\n              }))\n        .toPromise()\n        .then(() => undefined);\n  }\n\n  postMessageWithOperation(type: string, payload: Object, operationNonce: number):\n      Promise<boolean> {\n    const waitForOperationCompleted = this.waitForOperationCompleted(operationNonce);\n    const postMessage = this.postMessage(type, payload);\n    return Promise.all([postMessage, waitForOperationCompleted]).then(([, result]) => result);\n  }\n\n  generateNonce(): number {\n    return Math.round(Math.random() * 10000000);\n  }\n\n  eventsOfType<T extends TypedEvent>(type: T['type']|T['type'][]): Observable<T> {\n    let filterFn: (event: TypedEvent) => event is T;\n    if (typeof type === 'string') {\n      filterFn = (event: TypedEvent): event is T => event.type === type;\n    } else {\n      filterFn = (event: TypedEvent): event is T => type.includes(event.type);\n    }\n    return this.events.pipe(filter(filterFn));\n  }\n\n  nextEventOfType<T extends TypedEvent>(type: T['type']): Observable<T> {\n    return this.eventsOfType(type).pipe(take(1));\n  }\n\n  waitForOperationCompleted(nonce: number): Promise<boolean> {\n    return this.eventsOfType<OperationCompletedEvent>('OPERATION_COMPLETED')\n        .pipe(filter(event => event.nonce === nonce), take(1), map(event => {\n                if (event.result !== undefined) {\n                  return event.result;\n                }\n                throw new Error(event.error!);\n              }))\n        .toPromise();\n  }\n\n  get isEnabled(): boolean {\n    return !!this.serviceWorker;\n  }\n}\n"]}