@aws-amplify/pubsub/dist/esm/utils/ConnectionStateMonitor.mjs.map

Pubsub category of aws-amplify

{"version":3,"file":"ConnectionStateMonitor.mjs","sources":["../../../src/utils/ConnectionStateMonitor.ts"],"sourcesContent":["// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.\n// SPDX-License-Identifier: Apache-2.0\nimport { Observable, filter, map } from 'rxjs';\nimport { ConnectionState } from '../types/PubSub';\nimport { ReachabilityMonitor } from './ReachabilityMonitor';\nexport const CONNECTION_CHANGE = {\n    KEEP_ALIVE_MISSED: { keepAliveState: 'unhealthy' },\n    KEEP_ALIVE: { keepAliveState: 'healthy' },\n    CONNECTION_ESTABLISHED: { connectionState: 'connected' },\n    CONNECTION_FAILED: {\n        intendedConnectionState: 'disconnected',\n        connectionState: 'disconnected',\n    },\n    CLOSING_CONNECTION: { intendedConnectionState: 'disconnected' },\n    OPENING_CONNECTION: {\n        intendedConnectionState: 'connected',\n        connectionState: 'connecting',\n    },\n    CLOSED: { connectionState: 'disconnected' },\n    ONLINE: { networkState: 'connected' },\n    OFFLINE: { networkState: 'disconnected' },\n};\nexport class ConnectionStateMonitor {\n    constructor() {\n        this._networkMonitoringSubscription = undefined;\n        this._linkedConnectionState = {\n            networkState: 'connected',\n            connectionState: 'disconnected',\n            intendedConnectionState: 'disconnected',\n            keepAliveState: 'healthy',\n        };\n        // Attempt to update the state with the current actual network state\n        this._initialNetworkStateSubscription = ReachabilityMonitor().subscribe(({ online }) => {\n            this.record(online ? CONNECTION_CHANGE.ONLINE : CONNECTION_CHANGE.OFFLINE);\n            this._initialNetworkStateSubscription?.unsubscribe();\n        });\n        this._linkedConnectionStateObservable =\n            new Observable(connectionStateObserver => {\n                connectionStateObserver.next(this._linkedConnectionState);\n                this._linkedConnectionStateObserver = connectionStateObserver;\n            });\n    }\n    /**\n     * Turn network state monitoring on if it isn't on already\n     */\n    enableNetworkMonitoring() {\n        // If no initial network state was discovered, stop trying\n        this._initialNetworkStateSubscription?.unsubscribe();\n        // Maintain the network state based on the reachability monitor\n        if (this._networkMonitoringSubscription === undefined) {\n            this._networkMonitoringSubscription = ReachabilityMonitor().subscribe(({ online }) => {\n                this.record(online ? CONNECTION_CHANGE.ONLINE : CONNECTION_CHANGE.OFFLINE);\n            });\n        }\n    }\n    /**\n     * Turn network state monitoring off if it isn't off already\n     */\n    disableNetworkMonitoring() {\n        this._networkMonitoringSubscription?.unsubscribe();\n        this._networkMonitoringSubscription = undefined;\n    }\n    /**\n     * Get the observable that allows us to monitor the connection state\n     *\n     * @returns {Observable<ConnectionState>} - The observable that emits ConnectionState updates\n     */\n    get connectionStateObservable() {\n        let previous;\n        // The linked state aggregates state changes to any of the network, connection,\n        // intendedConnection and keepAliveHealth. Some states will change these independent\n        // states without changing the overall connection state.\n        // After translating from linked states to ConnectionState, then remove any duplicates\n        return this._linkedConnectionStateObservable\n            .pipe(map(value => {\n            return this.connectionStatesTranslator(value);\n        }))\n            .pipe(filter(current => {\n            const toInclude = current !== previous;\n            previous = current;\n            return toInclude;\n        }));\n    }\n    /*\n     * Updates local connection state and emits the full state to the observer.\n     */\n    record(statusUpdates) {\n        // Maintain the network monitor\n        if (statusUpdates.intendedConnectionState === 'connected') {\n            this.enableNetworkMonitoring();\n        }\n        else if (statusUpdates.intendedConnectionState === 'disconnected') {\n            this.disableNetworkMonitoring();\n        }\n        // Maintain the socket state\n        const newSocketStatus = {\n            ...this._linkedConnectionState,\n            ...statusUpdates,\n        };\n        this._linkedConnectionState = { ...newSocketStatus };\n        this._linkedConnectionStateObserver?.next(this._linkedConnectionState);\n    }\n    /*\n     * Translate the ConnectionState structure into a specific ConnectionState string literal union\n     */\n    connectionStatesTranslator({ connectionState, networkState, intendedConnectionState, keepAliveState, }) {\n        if (connectionState === 'connected' && networkState === 'disconnected')\n            return ConnectionState.ConnectedPendingNetwork;\n        if (connectionState === 'connected' &&\n            intendedConnectionState === 'disconnected')\n            return ConnectionState.ConnectedPendingDisconnect;\n        if (connectionState === 'disconnected' &&\n            intendedConnectionState === 'connected' &&\n            networkState === 'disconnected')\n            return ConnectionState.ConnectionDisruptedPendingNetwork;\n        if (connectionState === 'disconnected' &&\n            intendedConnectionState === 'connected')\n            return ConnectionState.ConnectionDisrupted;\n        if (connectionState === 'connected' && keepAliveState === 'unhealthy')\n            return ConnectionState.ConnectedPendingKeepAlive;\n        // All remaining states directly correspond to the connection state\n        if (connectionState === 'connecting')\n            return ConnectionState.Connecting;\n        if (connectionState === 'disconnected')\n            return ConnectionState.Disconnected;\n        return ConnectionState.Connected;\n    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