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refactor(service-worker): avoid unnecessary operations and remove unused code (#24127)

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PR Close #24127
This commit is contained in:
George Kalpakas 2018-05-25 14:37:46 +03:00 committed by Miško Hevery
parent 250527ca68
commit 45feb10c46
1 changed files with 14 additions and 19 deletions
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17
packages/service-worker/worker/src/driver.ts
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@ -225,7 +225,9 @@ export class Driver implements Debuggable, UpdateSource {
// Initialization is the only event which is sent directly from the SW to itself,
// and thus `event.source` is not a Client. Handle it here, before the check
// for Client sources.
if (data.action === 'INITIALIZE' && this.initialized === null) {
if (data.action === 'INITIALIZE') {
// Only initialize if not already initialized (or initializing).
if (this.initialized === null) {
// Initialize the SW.
this.initialized = this.initialize();
@ -237,6 +239,9 @@ export class Driver implements Debuggable, UpdateSource {
})());
}
return;
}
// Only messages from true clients are accepted past this point (this is essentially
// a typecast).
if (!this.adapter.isClient(event.source)) {
@ -725,16 +730,6 @@ export class Driver implements Debuggable, UpdateSource {
private async setupUpdate(manifest: Manifest, hash: string): Promise<void> {
const newVersion = new AppVersion(this.scope, this.adapter, this.db, this.idle, manifest, hash);
// Try to determine a version that's safe to update from.
let updateFrom: AppVersion|undefined = undefined;
// It's always safe to update from a version, even a broken one, as it will still
// only have valid resources cached. If there is no latest version, though, this
// update will have to install as a fresh version.
if (this.latestHash !== null) {
updateFrom = this.versions.get(this.latestHash);
}
// Firstly, check if the manifest version is correct.
if (manifest.configVersion !== SUPPORTED_CONFIG_VERSION) {
await this.deleteAllCaches();