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* @license
* Copyright 2019 Google Inc.
*
* 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.
*/
import { createInstallation } from '../api/create-installation';
import { AppConfig } from '../interfaces/app-config';
import {
InProgressInstallationEntry,
InstallationEntry,
RequestStatus,
RegisteredInstallationEntry
} from '../interfaces/installation-entry';
import { PENDING_TIMEOUT_MS } from '../util/constants';
import { ERROR_FACTORY, ErrorCode, isServerError } from '../util/errors';
import { sleep } from '../util/sleep';
import { generateFid, INVALID_FID } from './generate-fid';
import { remove, set, update } from './idb-manager';
export interface InstallationEntryWithRegistrationPromise {
installationEntry: InstallationEntry;
/** Exist iff the installationEntry is not registered. */
registrationPromise?: Promise<RegisteredInstallationEntry>;
}
/**
* Updates and returns the InstallationEntry from the database.
* Also triggers a registration request if it is necessary and possible.
*/
export async function getInstallationEntry(
appConfig: AppConfig
): Promise<InstallationEntryWithRegistrationPromise> {
let registrationPromise: Promise<RegisteredInstallationEntry> | undefined;
const installationEntry = await update(appConfig, oldEntry => {
const installationEntry = updateOrCreateInstallationEntry(oldEntry);
const entryWithPromise = triggerRegistrationIfNecessary(
appConfig,
installationEntry
);
registrationPromise = entryWithPromise.registrationPromise;
return entryWithPromise.installationEntry;
});
if (installationEntry.fid === INVALID_FID) {
// FID generation failed. Waiting for the FID from the server.
return { installationEntry: await registrationPromise! };
}
return {
installationEntry,
registrationPromise
};
}
/**
* Creates a new Installation Entry if one does not exist.
* Also clears timed out pending requests.
*/
function updateOrCreateInstallationEntry(
oldEntry: InstallationEntry | undefined
): InstallationEntry {
const entry: InstallationEntry = oldEntry || {
fid: generateFid(),
registrationStatus: RequestStatus.NOT_STARTED
};
return clearTimedOutRequest(entry);
}
/**
* If the Firebase Installation is not registered yet, this will trigger the
* registration and return an InProgressInstallationEntry.
*
* If registrationPromise does not exist, the installationEntry is guaranteed
* to be registered.
*/
function triggerRegistrationIfNecessary(
appConfig: AppConfig,
installationEntry: InstallationEntry
): InstallationEntryWithRegistrationPromise {
if (installationEntry.registrationStatus === RequestStatus.NOT_STARTED) {
if (!navigator.onLine) {
// Registration required but app is offline.
const registrationPromiseWithError = Promise.reject(
ERROR_FACTORY.create(ErrorCode.APP_OFFLINE)
);
return {
installationEntry,
registrationPromise: registrationPromiseWithError
};
}
// Try registering. Change status to IN_PROGRESS.
const inProgressEntry: InProgressInstallationEntry = {
fid: installationEntry.fid,
registrationStatus: RequestStatus.IN_PROGRESS,
registrationTime: Date.now()
};
const registrationPromise = registerInstallation(
appConfig,
inProgressEntry
);
return { installationEntry: inProgressEntry, registrationPromise };
} else if (
installationEntry.registrationStatus === RequestStatus.IN_PROGRESS
) {
return {
installationEntry,
registrationPromise: waitUntilFidRegistration(appConfig)
};
} else {
return { installationEntry };
}
}
/** This will be executed only once for each new Firebase Installation. */
async function registerInstallation(
appConfig: AppConfig,
installationEntry: InProgressInstallationEntry
): Promise<RegisteredInstallationEntry> {
try {
const registeredInstallationEntry = await createInstallation(
appConfig,
installationEntry
);
return set(appConfig, registeredInstallationEntry);
} catch (e) {
if (isServerError(e) && e.serverCode === 409) {
// Server returned a "FID can not be used" error.
// Generate a new ID next time.
await remove(appConfig);
} else {
// Registration failed. Set FID as not registered.
await set(appConfig, {
fid: installationEntry.fid,
registrationStatus: RequestStatus.NOT_STARTED
});
}
throw e;
}
}
/** Call if FID registration is pending in another request. */
async function waitUntilFidRegistration(
appConfig: AppConfig
): Promise<RegisteredInstallationEntry> {
// Unfortunately, there is no way of reliably observing when a value in
// IndexedDB changes (yet, see https://github.com/WICG/indexed-db-observers),
// so we need to poll.
let entry: InstallationEntry = await updateInstallationRequest(appConfig);
while (entry.registrationStatus === RequestStatus.IN_PROGRESS) {
// createInstallation request still in progress.
await sleep(100);
entry = await updateInstallationRequest(appConfig);
}
if (Eentry.registrationStatus === RequestStatus.NOT_STARTED) {
// The request timed out or failed in a different call. Try again.
const {
installationEntry,
registrationPromise
} = await getInstallationEntry(appConfig);
if (registrationPromise) {
return registrationPromise;
} else {
// if there is no registrationPromise, entry is registered.
return installationEntry as RegisteredInstallationEntry;
}
}
return entry;
}
/**
* Called only if there is a CreateInstallation request in progress.
*
* Updates the InstallationEntry in the DB based on the status of the
* CreateInstallation request.
*
* Returns the updated InstallationEntry.
*/
function updateInstallationRequest(
appConfig: AppConfig
): Promise<InstallationEntry> {
return update(appConfig, oldEntry => {
Iif (!oldEntry) {
throw ERROR_FACTORY.create(ErrorCode.INSTALLATION_NOT_FOUND);
}
return clearTimedOutRequest(oldEntry);
});
}
function clearTimedOutRequest(entry: InstallationEntry): InstallationEntry {
if (hasInstallationRequestTimedOut(entry)) {
return {
fid: entry.fid,
registrationStatus: RequestStatus.NOT_STARTED
};
}
return entry;
}
function hasInstallationRequestTimedOut(
installationEntry: InstallationEntry
): boolean {
return (
installationEntry.registrationStatus === RequestStatus.IN_PROGRESS &&
installationEntry.registrationTime + PENDING_TIMEOUT_MS < Date.now()
);
}
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