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fix(StoreDevtools): Do not send full liftedState on simple actions. #790

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Feb 6, 2018
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fix(StoreDevtools): Do not send full liftedState on simple actions. #790

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35 changes: 31 additions & 4 deletions modules/store-devtools/src/extension.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -10,6 +10,7 @@ import { takeUntil } from 'rxjs/operator/takeUntil';

import { STORE_DEVTOOLS_CONFIG, StoreDevtoolsConfig } from './config';
import { LiftedState } from './reducer';
import { PerformAction } from './actions';
import { applyOperators } from './utils';

export const ExtensionActionTypes = {
Expand All @@ -28,11 +29,13 @@ export interface ReduxDevtoolsExtensionConnection {
unsubscribe(): void;
send(action: any, state: any): void;
init(state?: any): void;
error(any: any): void;
}
export interface ReduxDevtoolsExtensionConfig {
features?: object | boolean;
name: string | undefined;
instanceId: string;
maxAge?: number;
}

export interface ReduxDevtoolsExtension {
Expand All @@ -51,6 +54,7 @@ export interface ReduxDevtoolsExtension {
export class DevtoolsExtension {
private instanceId = `ngrx-store-${Date.now()}`;
private devtoolsExtension: ReduxDevtoolsExtension;
private extensionConnection: ReduxDevtoolsExtensionConnection;

liftedActions$: Observable<any>;
actions$: Observable<any>;
Expand All @@ -68,7 +72,26 @@ export class DevtoolsExtension {
return;
}

this.devtoolsExtension.send(null, state, this.config, this.instanceId);
// Check to see if the action requires a full update of the liftedState.
// If it is a simple action generated by the user's app, only send the
// action and the current state (fast).
//
// A full liftedState update (slow: serializes the entire liftedState) is
// only required when:
// a) redux-devtools-extension fires the @@Init action (ignored by
// @ngrx/store-devtools)
// b) an action is generated by an @ngrx module (e.g. @ngrx/effects/init
// or @ngrx/store/update-reducers)
// c) the state has been recomputed due to time-traveling
// d) any action that is not a PerformAction to err on the side of
// caution.
if (action instanceof PerformAction) {
const currentState = state.computedStates[state.currentStateIndex].state;
this.extensionConnection.send(action.action, currentState);
} else {
// Requires full state update;
this.devtoolsExtension.send(null, state, this.config, this.instanceId);
}
}

private createChangesObservable(): Observable<any> {
Expand All @@ -77,15 +100,19 @@ export class DevtoolsExtension {
}

return new Observable(subscriber => {
const connection = this.devtoolsExtension.connect({
let extensionOptions: ReduxDevtoolsExtensionConfig = {
instanceId: this.instanceId,
name: this.config.name,
features: this.config.features,
});
};
if (this.config.maxAge !== false /* support === 0 */) {
extensionOptions.maxAge = this.config.maxAge;
}
const connection = this.devtoolsExtension.connect(extensionOptions);
this.extensionConnection = connection;
connection.init();

connection.subscribe((change: any) => subscriber.next(change));

return connection.unsubscribe;
});
}
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