Comparable to the browser's Cache API for responses, but the Cache API requires a Service * Worker, which requires HTTPS, which would significantly complicate SDK installation. Also, the * Cache API doesn't support matching entries by time. */ class CachingClient { constructor(client, storage, storageCache, logger) { this.client = client; this.storage = storage; this.storageCache = storageCache; this.logger = logger; } /** * Returns true if the age of the cached fetched configs is less than or equal to * {@link Settings#minimumFetchIntervalInSeconds}. * *
This is comparable to passing `headers = { 'Cache-Control': max-age Visible for testing.
*/
isCachedDataFresh(cacheMaxAgeMillis, lastSuccessfulFetchTimestampMillis) {
// Cache can only be fresh if it's populated.
if (!lastSuccessfulFetchTimestampMillis) {
this.logger.debug('Config fetch cache check. Cache unpopulated.');
return false;
}
// Calculates age of cache entry.
const cacheAgeMillis = Date.now() - lastSuccessfulFetchTimestampMillis;
const isCachedDataFresh = cacheAgeMillis <= cacheMaxAgeMillis;
this.logger.debug('Config fetch cache check.' +
` Cache age millis: ${cacheAgeMillis}.` +
` Cache max age millis (minimumFetchIntervalMillis setting): ${cacheMaxAgeMillis}.` +
` Is cache hit: ${isCachedDataFresh}.`);
return isCachedDataFresh;
}
async fetch(request) {
// Reads from persisted storage to avoid cache miss if callers don't wait on initialization.
const [lastSuccessfulFetchTimestampMillis, lastSuccessfulFetchResponse] = await Promise.all([
this.storage.getLastSuccessfulFetchTimestampMillis(),
this.storage.getLastSuccessfulFetchResponse()
]);
// Exits early on cache hit.
if (lastSuccessfulFetchResponse &&
this.isCachedDataFresh(request.cacheMaxAgeMillis, lastSuccessfulFetchTimestampMillis)) {
return lastSuccessfulFetchResponse;
}
// Deviates from pure decorator by not honoring a passed ETag since we don't have a public API
// that allows the caller to pass an ETag.
request.eTag =
lastSuccessfulFetchResponse && lastSuccessfulFetchResponse.eTag;
// Falls back to service on cache miss.
const response = await this.client.fetch(request);
// Fetch throws for non-success responses, so success is guaranteed here.
const storageOperations = [
// Uses write-through cache for consistency with synchronous public API.
this.storageCache.setLastSuccessfulFetchTimestampMillis(Date.now())
];
if (response.status === 200) {
// Caches response only if it has changed, ie non-304 responses.
storageOperations.push(this.storage.setLastSuccessfulFetchResponse(response));
}
await Promise.all(storageOperations);
return response;
}
}
/**
* @license
* Copyright 2019 Google LLC
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
const ERROR_DESCRIPTION_MAP = {
["registration-window" /* REGISTRATION_WINDOW */]: 'Undefined window object. This SDK only supports usage in a browser environment.',
["registration-project-id" /* REGISTRATION_PROJECT_ID */]: 'Undefined project identifier. Check Firebase app initialization.',
["registration-api-key" /* REGISTRATION_API_KEY */]: 'Undefined API key. Check Firebase app initialization.',
["registration-app-id" /* REGISTRATION_APP_ID */]: 'Undefined app identifier. Check Firebase app initialization.',
["storage-open" /* STORAGE_OPEN */]: 'Error thrown when opening storage. Original error: {$originalErrorMessage}.',
["storage-get" /* STORAGE_GET */]: 'Error thrown when reading from storage. Original error: {$originalErrorMessage}.',
["storage-set" /* STORAGE_SET */]: 'Error thrown when writing to storage. Original error: {$originalErrorMessage}.',
["storage-delete" /* STORAGE_DELETE */]: 'Error thrown when deleting from storage. Original error: {$originalErrorMessage}.',
["fetch-client-network" /* FETCH_NETWORK */]: 'Fetch client failed to connect to a network. Check Internet connection.' +
' Original error: {$originalErrorMessage}.',
["fetch-timeout" /* FETCH_TIMEOUT */]: 'The config fetch request timed out. ' +
' Configure timeout using "fetchTimeoutMillis" SDK setting.',
["fetch-throttle" /* FETCH_THROTTLE */]: 'The config fetch request timed out while in an exponential backoff state.' +
' Configure timeout using "fetchTimeoutMillis" SDK setting.' +
' Unix timestamp in milliseconds when fetch request throttling ends: {$throttleEndTimeMillis}.',
["fetch-client-parse" /* FETCH_PARSE */]: 'Fetch client could not parse response.' +
' Original error: {$originalErrorMessage}.',
["fetch-status" /* FETCH_STATUS */]: 'Fetch server returned an HTTP error status. HTTP status: {$httpStatus}.'
};
const ERROR_FACTORY = new ErrorFactory('remoteconfig' /* service */, 'Remote Config' /* service name */, ERROR_DESCRIPTION_MAP);
// Note how this is like typeof/instanceof, but for ErrorCode.
function hasErrorCode(e, errorCode) {
return e instanceof FirebaseError && e.code.indexOf(errorCode) !== -1;
}
/**
* @license
* Copyright 2019 Google LLC
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* Attempts to get the most accurate browser language setting.
*
* Adapted from getUserLanguage in packages/auth/src/utils.js for TypeScript.
*
* Defers default language specification to server logic for consistency.
*
* @param navigatorLanguage Enables tests to override read-only {@link NavigatorLanguage}.
*/
function getUserLanguage(navigatorLanguage = navigator) {
return (
// Most reliable, but only supported in Chrome/Firefox.
(navigatorLanguage.languages && navigatorLanguage.languages[0]) ||
// Supported in most browsers, but returns the language of the browser
// UI, not the language set in browser settings.
navigatorLanguage.language
// Polyfill otherwise.
);
}
/**
* @license
* Copyright 2019 Google LLC
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* Implements the Client abstraction for the Remote Config REST API.
*/
class RestClient {
constructor(firebaseInstallations, sdkVersion, namespace, projectId, apiKey, appId) {
this.firebaseInstallations = firebaseInstallations;
this.sdkVersion = sdkVersion;
this.namespace = namespace;
this.projectId = projectId;
this.apiKey = apiKey;
this.appId = appId;
}
/**
* Fetches from the Remote Config REST API.
*
* @throws a {@link ErrorCode.FETCH_NETWORK} error if {@link GlobalFetch#fetch} can't
* connect to the network.
* @throws a {@link ErrorCode.FETCH_PARSE} error if {@link Response#json} can't parse the
* fetch response.
* @throws a {@link ErrorCode.FETCH_STATUS} error if the service returns an HTTP error status.
*/
async fetch(request) {
const [installationId, installationToken] = await Promise.all([
this.firebaseInstallations.getId(),
this.firebaseInstallations.getToken()
]);
const urlBase = window.FIREBASE_REMOTE_CONFIG_URL_BASE ||
'https://firebaseremoteconfig.googleapis.com';
const url = `${urlBase}/v1/projects/${this.projectId}/namespaces/${this.namespace}:fetch?key=${this.apiKey}`;
const headers = {
'Content-Type': 'application/json',
'Content-Encoding': 'gzip',
// Deviates from pure decorator by not passing max-age header since we don't currently have
// service behavior using that header.
'If-None-Match': request.eTag || '*'
};
const requestBody = {
/* eslint-disable camelcase */
sdk_version: this.sdkVersion,
app_instance_id: installationId,
app_instance_id_token: installationToken,
app_id: this.appId,
language_code: getUserLanguage()
/* eslint-enable camelcase */
};
const options = {
method: 'POST',
headers,
body: JSON.stringify(requestBody)
};
// This logic isn't REST-specific, but shimming abort logic isn't worth another decorator.
const fetchPromise = fetch(url, options);
const timeoutPromise = new Promise((_resolve, reject) => {
// Maps async event listener to Promise API.
request.signal.addEventListener(() => {
// Emulates https://heycam.github.io/webidl/#aborterror
const error = new Error('The operation was aborted.');
error.name = 'AbortError';
reject(error);
});
});
let response;
try {
await Promise.race([fetchPromise, timeoutPromise]);
response = await fetchPromise;
}
catch (originalError) {
let errorCode = "fetch-client-network" /* FETCH_NETWORK */;
if (originalError.name === 'AbortError') {
errorCode = "fetch-timeout" /* FETCH_TIMEOUT */;
}
throw ERROR_FACTORY.create(errorCode, {
originalErrorMessage: originalError.message
});
}
let status = response.status;
// Normalizes nullable header to optional.
const responseEtag = response.headers.get('ETag') || undefined;
let config;
let state;
// JSON parsing throws SyntaxError if the response body isn't a JSON string.
// Requesting application/json and checking for a 200 ensures there's JSON data.
if (response.status === 200) {
let responseBody;
try {
responseBody = await response.json();
}
catch (originalError) {
throw ERROR_FACTORY.create("fetch-client-parse" /* FETCH_PARSE */, {
originalErrorMessage: originalError.message
});
}
config = responseBody['entries'];
state = responseBody['state'];
}
// Normalizes based on legacy state.
if (state === 'INSTANCE_STATE_UNSPECIFIED') {
status = 500;
}
else if (state === 'NO_CHANGE') {
status = 304;
}
else if (state === 'NO_TEMPLATE' || state === 'EMPTY_CONFIG') {
// These cases can be fixed remotely, so normalize to safe value.
config = {};
}
// Normalize to exception-based control flow for non-success cases.
// Encapsulates HTTP specifics in this class as much as possible. Status is still the best for
// differentiating success states (200 from 304; the state body param is undefined in a
// standard 304).
if (status !== 304 && status !== 200) {
throw ERROR_FACTORY.create("fetch-status" /* FETCH_STATUS */, {
httpStatus: status
});
}
return { status, eTag: responseEtag, config };
}
}
/**
* @license
* Copyright 2019 Google LLC
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* Shims a minimal AbortSignal.
*
* AbortController's AbortSignal conveniently decouples fetch timeout logic from other aspects
* of networking, such as retries. Firebase doesn't use AbortController enough to justify a
* polyfill recommendation, like we do with the Fetch API, but this minimal shim can easily be
* swapped out if/when we do.
*/
class RemoteConfigAbortSignal {
constructor() {
this.listeners = [];
}
addEventListener(listener) {
this.listeners.push(listener);
}
abort() {
this.listeners.forEach(listener => listener());
}
}
/**
* @license
* Copyright 2019 Google LLC
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
const DEFAULT_VALUE_FOR_BOOLEAN = false;
const DEFAULT_VALUE_FOR_STRING = '';
const DEFAULT_VALUE_FOR_NUMBER = 0;
const BOOLEAN_TRUTHY_VALUES = ['1', 'true', 't', 'yes', 'y', 'on'];
class Value {
constructor(_source, _value = DEFAULT_VALUE_FOR_STRING) {
this._source = _source;
this._value = _value;
}
asString() {
return this._value;
}
asBoolean() {
if (this._source === 'static') {
return DEFAULT_VALUE_FOR_BOOLEAN;
}
return BOOLEAN_TRUTHY_VALUES.indexOf(this._value.toLowerCase()) >= 0;
}
asNumber() {
if (this._source === 'static') {
return DEFAULT_VALUE_FOR_NUMBER;
}
let num = Number(this._value);
if (isNaN(num)) {
num = DEFAULT_VALUE_FOR_NUMBER;
}
return num;
}
getSource() {
return this._source;
}
}
/**
* @license
* Copyright 2019 Google LLC
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
const DEFAULT_FETCH_TIMEOUT_MILLIS = 60 * 1000; // One minute
const DEFAULT_CACHE_MAX_AGE_MILLIS = 12 * 60 * 60 * 1000; // Twelve hours.
/**
* Encapsulates business logic mapping network and storage dependencies to the public SDK API.
*
* See {@link https://github.com/FirebasePrivate/firebase-js-sdk/blob/master/packages/firebase/index.d.ts|interface documentation} for method descriptions.
*/
class RemoteConfig {
constructor(
// Required by FirebaseServiceFactory interface.
app,
// JS doesn't support private yet
// (https://github.com/tc39/proposal-class-fields#private-fields), so we hint using an
// underscore prefix.
_client, _storageCache, _storage, _logger) {
this.app = app;
this._client = _client;
this._storageCache = _storageCache;
this._storage = _storage;
this._logger = _logger;
// Tracks completion of initialization promise.
this._isInitializationComplete = false;
this.settings = {
fetchTimeoutMillis: DEFAULT_FETCH_TIMEOUT_MILLIS,
minimumFetchIntervalMillis: DEFAULT_CACHE_MAX_AGE_MILLIS
};
this.defaultConfig = {};
}
// Based on packages/firestore/src/util/log.ts but not static because we need per-instance levels
// to differentiate 2p and 3p use-cases.
setLogLevel(logLevel) {
switch (logLevel) {
case 'debug':
this._logger.logLevel = LogLevel.DEBUG;
break;
case 'silent':
this._logger.logLevel = LogLevel.SILENT;
break;
default:
this._logger.logLevel = LogLevel.ERROR;
}
}
get fetchTimeMillis() {
return this._storageCache.getLastSuccessfulFetchTimestampMillis() || -1;
}
get lastFetchStatus() {
return this._storageCache.getLastFetchStatus() || 'no-fetch-yet';
}
async activate() {
const [lastSuccessfulFetchResponse, activeConfigEtag] = await Promise.all([
this._storage.getLastSuccessfulFetchResponse(),
this._storage.getActiveConfigEtag()
]);
if (!lastSuccessfulFetchResponse ||
!lastSuccessfulFetchResponse.config ||
!lastSuccessfulFetchResponse.eTag ||
lastSuccessfulFetchResponse.eTag === activeConfigEtag) {
// Either there is no successful fetched config, or is the same as current active
// config.
return false;
}
await Promise.all([
this._storageCache.setActiveConfig(lastSuccessfulFetchResponse.config),
this._storage.setActiveConfigEtag(lastSuccessfulFetchResponse.eTag)
]);
return true;
}
ensureInitialized() {
if (!this._initializePromise) {
this._initializePromise = this._storageCache
.loadFromStorage()
.then(() => {
this._isInitializationComplete = true;
});
}
return this._initializePromise;
}
/**
* @throws a {@link ErrorCode.FETCH_CLIENT_TIMEOUT} if the request takes longer than
* {@link Settings.fetchTimeoutInSeconds} or
* {@link DEFAULT_FETCH_TIMEOUT_SECONDS}.
*/
async fetch() {
// Aborts the request after the given timeout, causing the fetch call to
// reject with an AbortError.
//
// Aborting after the request completes is a no-op, so we don't need a
// corresponding clearTimeout.
//
// Locating abort logic here because:
// * it uses a developer setting (timeout)
// * it applies to all retries (like curl's max-time arg)
// * it is consistent with the Fetch API's signal input
const abortSignal = new RemoteConfigAbortSignal();
setTimeout(async () => {
// Note a very low delay, eg < 10ms, can elapse before listeners are initialized.
abortSignal.abort();
}, this.settings.fetchTimeoutMillis);
// Catches *all* errors thrown by client so status can be set consistently.
try {
await this._client.fetch({
cacheMaxAgeMillis: this.settings.minimumFetchIntervalMillis,
signal: abortSignal
});
await this._storageCache.setLastFetchStatus('success');
}
catch (e) {
const lastFetchStatus = hasErrorCode(e, "fetch-throttle" /* FETCH_THROTTLE */)
? 'throttle'
: 'failure';
await this._storageCache.setLastFetchStatus(lastFetchStatus);
throw e;
}
}
async fetchAndActivate() {
await this.fetch();
return this.activate();
}
getAll() {
return getAllKeys(this._storageCache.getActiveConfig(), this.defaultConfig).reduce((allConfigs, key) => {
allConfigs[key] = this.getValue(key);
return allConfigs;
}, {});
}
getBoolean(key) {
return this.getValue(key).asBoolean();
}
getNumber(key) {
return this.getValue(key).asNumber();
}
getString(key) {
return this.getValue(key).asString();
}
getValue(key) {
if (!this._isInitializationComplete) {
this._logger.debug(`A value was requested for key "${key}" before SDK initialization completed.` +
' Await on ensureInitialized if the intent was to get a previously activated value.');
}
const activeConfig = this._storageCache.getActiveConfig();
if (activeConfig && activeConfig[key] !== undefined) {
return new Value('remote', activeConfig[key]);
}
else if (this.defaultConfig && this.defaultConfig[key] !== undefined) {
return new Value('default', String(this.defaultConfig[key]));
}
this._logger.debug(`Returning static value for key "${key}".` +
' Define a default or remote value if this is unintentional.');
return new Value('static');
}
}
/**
* Dedupes and returns an array of all the keys of the received objects.
*/
function getAllKeys(obj1 = {}, obj2 = {}) {
return Object.keys(Object.assign(Object.assign({}, obj1), obj2));
}
/**
* @license
* Copyright 2019 Google LLC
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* Converts an error event associated with a {@link IDBRequest} to a {@link FirebaseError}.
*/
function toFirebaseError(event, errorCode) {
const originalError = event.target.error || undefined;
return ERROR_FACTORY.create(errorCode, {
originalErrorMessage: originalError && originalError.message
});
}
/**
* A general-purpose store keyed by app + namespace + {@link
* ProjectNamespaceKeyFieldValue}.
*
* The Remote Config SDK can be used with multiple app installations, and each app can interact
* with multiple namespaces, so this store uses app (ID + name) and namespace as common parent keys
* for a set of key-value pairs. See {@link Storage#createCompositeKey}.
*
* Visible for testing.
*/
const APP_NAMESPACE_STORE = 'app_namespace_store';
const DB_NAME = 'firebase_remote_config';
const DB_VERSION = 1;
// Visible for testing.
function openDatabase() {
return new Promise((resolve, reject) => {
const request = indexedDB.open(DB_NAME, DB_VERSION);
request.onerror = event => {
reject(toFirebaseError(event, "storage-open" /* STORAGE_OPEN */));
};
request.onsuccess = event => {
resolve(event.target.result);
};
request.onupgradeneeded = event => {
const db = event.target.result;
// We don't use 'break' in this switch statement, the fall-through
// behavior is what we want, because if there are multiple versions between
// the old version and the current version, we want ALL the migrations
// that correspond to those versions to run, not only the last one.
// eslint-disable-next-line default-case
switch (event.oldVersion) {
case 0:
db.createObjectStore(APP_NAMESPACE_STORE, {
keyPath: 'compositeKey'
});
}
};
});
}
/**
* Abstracts data persistence.
*/
class Storage {
/**
* @param appId enables storage segmentation by app (ID + name).
* @param appName enables storage segmentation by app (ID + name).
* @param namespace enables storage segmentation by namespace.
*/
constructor(appId, appName, namespace, openDbPromise = openDatabase()) {
this.appId = appId;
this.appName = appName;
this.namespace = namespace;
this.openDbPromise = openDbPromise;
}
getLastFetchStatus() {
return this.get('last_fetch_status');
}
setLastFetchStatus(status) {
return this.set('last_fetch_status', status);
}
// This is comparable to a cache entry timestamp. If we need to expire other data, we could
// consider adding timestamp to all storage records and an optional max age arg to getters.
getLastSuccessfulFetchTimestampMillis() {
return this.get('last_successful_fetch_timestamp_millis');
}
setLastSuccessfulFetchTimestampMillis(timestamp) {
return this.set('last_successful_fetch_timestamp_millis', timestamp);
}
getLastSuccessfulFetchResponse() {
return this.get('last_successful_fetch_response');
}
setLastSuccessfulFetchResponse(response) {
return this.set('last_successful_fetch_response', response);
}
getActiveConfig() {
return this.get('active_config');
}
setActiveConfig(config) {
return this.set('active_config', config);
}
getActiveConfigEtag() {
return this.get('active_config_etag');
}
setActiveConfigEtag(etag) {
return this.set('active_config_etag', etag);
}
getThrottleMetadata() {
return this.get('throttle_metadata');
}
setThrottleMetadata(metadata) {
return this.set('throttle_metadata', metadata);
}
deleteThrottleMetadata() {
return this.delete('throttle_metadata');
}
async get(key) {
const db = await this.openDbPromise;
return new Promise((resolve, reject) => {
const transaction = db.transaction([APP_NAMESPACE_STORE], 'readonly');
const objectStore = transaction.objectStore(APP_NAMESPACE_STORE);
const compositeKey = this.createCompositeKey(key);
try {
const request = objectStore.get(compositeKey);
request.onerror = event => {
reject(toFirebaseError(event, "storage-get" /* STORAGE_GET */));
};
request.onsuccess = event => {
const result = event.target.result;
if (result) {
resolve(result.value);
}
else {
resolve(undefined);
}
};
}
catch (e) {
reject(ERROR_FACTORY.create("storage-get" /* STORAGE_GET */, {
originalErrorMessage: e && e.message
}));
}
});
}
async set(key, value) {
const db = await this.openDbPromise;
return new Promise((resolve, reject) => {
const transaction = db.transaction([APP_NAMESPACE_STORE], 'readwrite');
const objectStore = transaction.objectStore(APP_NAMESPACE_STORE);
const compositeKey = this.createCompositeKey(key);
try {
const request = objectStore.put({
compositeKey,
value
});
request.onerror = (event) => {
reject(toFirebaseError(event, "storage-set" /* STORAGE_SET */));
};
request.onsuccess = () => {
resolve();
};
}
catch (e) {
reject(ERROR_FACTORY.create("storage-set" /* STORAGE_SET */, {
originalErrorMessage: e && e.message
}));
}
});
}
async delete(key) {
const db = await this.openDbPromise;
return new Promise((resolve, reject) => {
const transaction = db.transaction([APP_NAMESPACE_STORE], 'readwrite');
const objectStore = transaction.objectStore(APP_NAMESPACE_STORE);
const compositeKey = this.createCompositeKey(key);
try {
const request = objectStore.delete(compositeKey);
request.onerror = (event) => {
reject(toFirebaseError(event, "storage-delete" /* STORAGE_DELETE */));
};
request.onsuccess = () => {
resolve();
};
}
catch (e) {
reject(ERROR_FACTORY.create("storage-delete" /* STORAGE_DELETE */, {
originalErrorMessage: e && e.message
}));
}
});
}
// Facilitates composite key functionality (which is unsupported in IE).
createCompositeKey(key) {
return [this.appId, this.appName, this.namespace, key].join();
}
}
/**
* @license
* Copyright 2019 Google LLC
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* A memory cache layer over storage to support the SDK's synchronous read requirements.
*/
class StorageCache {
constructor(storage) {
this.storage = storage;
}
/**
* Memory-only getters
*/
getLastFetchStatus() {
return this.lastFetchStatus;
}
getLastSuccessfulFetchTimestampMillis() {
return this.lastSuccessfulFetchTimestampMillis;
}
getActiveConfig() {
return this.activeConfig;
}
/**
* Read-ahead getter
*/
async loadFromStorage() {
const lastFetchStatusPromise = this.storage.getLastFetchStatus();
const lastSuccessfulFetchTimestampMillisPromise = this.storage.getLastSuccessfulFetchTimestampMillis();
const activeConfigPromise = this.storage.getActiveConfig();
// Note:
// 1. we consistently check for undefined to avoid clobbering defined values
// in memory
// 2. we defer awaiting to improve readability, as opposed to destructuring
// a Promise.all result, for example
const lastFetchStatus = await lastFetchStatusPromise;
if (lastFetchStatus) {
this.lastFetchStatus = lastFetchStatus;
}
const lastSuccessfulFetchTimestampMillis = await lastSuccessfulFetchTimestampMillisPromise;
if (lastSuccessfulFetchTimestampMillis) {
this.lastSuccessfulFetchTimestampMillis = lastSuccessfulFetchTimestampMillis;
}
const activeConfig = await activeConfigPromise;
if (activeConfig) {
this.activeConfig = activeConfig;
}
}
/**
* Write-through setters
*/
setLastFetchStatus(status) {
this.lastFetchStatus = status;
return this.storage.setLastFetchStatus(status);
}
setLastSuccessfulFetchTimestampMillis(timestampMillis) {
this.lastSuccessfulFetchTimestampMillis = timestampMillis;
return this.storage.setLastSuccessfulFetchTimestampMillis(timestampMillis);
}
setActiveConfig(activeConfig) {
this.activeConfig = activeConfig;
return this.storage.setActiveConfig(activeConfig);
}
}
/**
* @license
* Copyright 2019 Google LLC
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* The amount of milliseconds to exponentially increase.
*/
const INTERVAL_MILLIS = 1000;
/**
* The factor to backoff by.
* Should be a number greater than 1.
*/
const BACKOFF_FACTOR = 2;
/**
* The maximum milliseconds to increase to.
*
* Visible for testing
*/
const MAX_VALUE_MILLIS = 4 * 60 * 60 * 1000; // Four hours, like iOS and Android.
/**
* The percentage of backoff time to randomize by.
* See
* http://go/safe-client-behavior#step-1-determine-the-appropriate-retry-interval-to-handle-spike-traffic
* for context.
*
* Visible for testing
*/
const RANDOM_FACTOR = 0.5;
/**
* Based on the backoff method from
* https://github.com/google/closure-library/blob/master/closure/goog/math/exponentialbackoff.js.
* Extracted here so we don't need to pass metadata and a stateful ExponentialBackoff object around.
*/
function calculateBackoffMillis(backoffCount) {
// Calculates an exponentially increasing value.
// Deviation: calculates value from count and a constant interval, so we only need to save value
// and count to restore state.
const currBaseValue = INTERVAL_MILLIS * Math.pow(BACKOFF_FACTOR, backoffCount);
// A random "fuzz" to avoid waves of retries.
// Deviation: randomFactor is required.
const randomWait = Math.round(
// A fraction of the backoff value to add/subtract.
// Deviation: changes multiplication order to improve readability.
RANDOM_FACTOR *
currBaseValue *
// A random float (rounded to int by Math.round above) in the range [-1, 1]. Determines
// if we add or subtract.
(Math.random() - 0.5) *
2);
// Limits backoff to max to avoid effectively permanent backoff.
return Math.min(MAX_VALUE_MILLIS, currBaseValue + randomWait);
}
/**
* @license
* Copyright 2019 Google LLC
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* Supports waiting on a backoff by:
*
* Visible for testing.
*/
function setAbortableTimeout(signal, throttleEndTimeMillis) {
return new Promise((resolve, reject) => {
// Derives backoff from given end time, normalizing negative numbers to zero.
const backoffMillis = Math.max(throttleEndTimeMillis - Date.now(), 0);
const timeout = setTimeout(resolve, backoffMillis);
// Adds listener, rather than sets onabort, because signal is a shared object.
signal.addEventListener(() => {
clearTimeout(timeout);
// If the request completes before this timeout, the rejection has no effect.
reject(ERROR_FACTORY.create("fetch-throttle" /* FETCH_THROTTLE */, {
throttleEndTimeMillis
}));
});
});
}
/**
* Returns true if the {@link Error} indicates a fetch request may succeed later.
*/
function isRetriableError(e) {
if (!(e instanceof FirebaseError)) {
return false;
}
// Uses string index defined by ErrorData, which FirebaseError implements.
const httpStatus = Number(e['httpStatus']);
return (httpStatus === 429 ||
httpStatus === 500 ||
httpStatus === 503 ||
httpStatus === 504);
}
/**
* Decorates a Client with retry logic.
*
* Comparable to CachingClient, but uses backoff logic instead of cache max age and doesn't cache
* responses (because the SDK has no use for error responses).
*/
class RetryingClient {
constructor(client, storage) {
this.client = client;
this.storage = storage;
}
async fetch(request) {
const throttleMetadata = (await this.storage.getThrottleMetadata()) || {
backoffCount: 0,
throttleEndTimeMillis: Date.now()
};
return this.attemptFetch(request, throttleMetadata);
}
/**
* A recursive helper for attempting a fetch request repeatedly.
*
* @throws any non-retriable errors.
*/
async attemptFetch(request, { throttleEndTimeMillis, backoffCount }) {
// Starts with a (potentially zero) timeout to support resumption from stored state.
// Ensures the throttle end time is honored if the last attempt timed out.
// Note the SDK will never make a request if the fetch timeout expires at this point.
await setAbortableTimeout(request.signal, throttleEndTimeMillis);
try {
const response = await this.client.fetch(request);
// Note the SDK only clears throttle state if response is success or non-retriable.
await this.storage.deleteThrottleMetadata();
return response;
}
catch (e) {
if (!isRetriableError(e)) {
throw e;
}
// Increments backoff state.
const throttleMetadata = {
throttleEndTimeMillis: Date.now() + calculateBackoffMillis(backoffCount),
backoffCount: backoffCount + 1
};
// Persists state.
await this.storage.setThrottleMetadata(throttleMetadata);
return this.attemptFetch(request, throttleMetadata);
}
}
}
const name = "@firebase/remote-config";
const version = "0.1.21";
/**
* @license
* Copyright 2019 Google LLC
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
function registerRemoteConfig(firebaseInstance) {
firebaseInstance.INTERNAL.registerComponent(new Component('remoteConfig', remoteConfigFactory, "PUBLIC" /* PUBLIC */).setMultipleInstances(true));
firebaseInstance.registerVersion(name, version);
function remoteConfigFactory(container, namespace) {
/* Dependencies */
// getImmediate for FirebaseApp will always succeed
const app = container.getProvider('app').getImmediate();
// The following call will always succeed because rc has `import '@firebase/installations'`
const installations = container.getProvider('installations').getImmediate();
// Guards against the SDK being used in non-browser environments.
if (typeof window === 'undefined') {
throw ERROR_FACTORY.create("registration-window" /* REGISTRATION_WINDOW */);
}
// Normalizes optional inputs.
const { projectId, apiKey, appId } = app.options;
if (!projectId) {
throw ERROR_FACTORY.create("registration-project-id" /* REGISTRATION_PROJECT_ID */);
}
if (!apiKey) {
throw ERROR_FACTORY.create("registration-api-key" /* REGISTRATION_API_KEY */);
}
if (!appId) {
throw ERROR_FACTORY.create("registration-app-id" /* REGISTRATION_APP_ID */);
}
namespace = namespace || 'firebase';
const storage = new Storage(appId, app.name, namespace);
const storageCache = new StorageCache(storage);
const logger = new Logger(name);
// Sets ERROR as the default log level.
// See RemoteConfig#setLogLevel for corresponding normalization to ERROR log level.
logger.logLevel = LogLevel.ERROR;
const restClient = new RestClient(installations,
// Uses the JS SDK version, by which the RC package version can be deduced, if necessary.
firebaseInstance.SDK_VERSION, namespace, projectId, apiKey, appId);
const retryingClient = new RetryingClient(restClient, storage);
const cachingClient = new CachingClient(retryingClient, storage, storageCache, logger);
const remoteConfigInstance = new RemoteConfig(app, cachingClient, storageCache, storage, logger);
// Starts warming cache.
// eslint-disable-next-line @typescript-eslint/no-floating-promises
remoteConfigInstance.ensureInitialized();
return remoteConfigInstance;
}
}
registerRemoteConfig(firebase);
export { registerRemoteConfig };
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