Source code
Revision control
Copy as Markdown
Other Tools
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
const lazy = {};
ChromeUtils.defineESModuleGetters(lazy, {
IndexedDB: "resource://gre/modules/IndexedDB.sys.mjs",
TelemetryEnvironment: "resource://gre/modules/TelemetryEnvironment.sys.mjs",
});
/**
* AddonRollouts store info about an active or expired addon rollouts.
* @typedef {object} AddonRollout
* @property {int} recipeId
* The ID of the recipe.
* @property {string} slug
* Unique slug of the rollout.
* @property {string} state
* The current state of the rollout: "active", or "rolled-back".
* Active means that Normandy is actively managing therollout. Rolled-back
* means that the rollout was previously active, but has been rolled back for
* this user.
* @property {int} extensionApiId
* The ID used to look up the extension in Normandy's API.
* @property {string} addonId
* The add-on ID for this particular rollout.
* @property {string} addonVersion
* The rollout add-on version number
* @property {string} xpiUrl
* URL that the add-on was installed from.
* @property {string} xpiHash
* The hash of the XPI file.
* @property {string} xpiHashAlgorithm
* The algorithm used to hash the XPI file.
*/
const DB_NAME = "normandy-addon-rollout";
const STORE_NAME = "addon-rollouts";
const DB_VERSION = 1;
/**
* Create a new connection to the database.
*/
function openDatabase() {
return lazy.IndexedDB.open(DB_NAME, DB_VERSION, db => {
db.createObjectStore(STORE_NAME, {
keyPath: "slug",
});
});
}
/**
* Cache the database connection so that it is shared among multiple operations.
*/
let databasePromise;
function getDatabase() {
if (!databasePromise) {
databasePromise = openDatabase();
}
return databasePromise;
}
/**
* Get a transaction for interacting with the rollout store.
*
* @param {IDBDatabase} db
* @param {String} mode Either "readonly" or "readwrite"
*
* NOTE: Methods on the store returned by this function MUST be called
* synchronously, otherwise the transaction with the store will expire.
* This is why the helper takes a database as an argument; if we fetched the
* database in the helper directly, the helper would be async and the
* transaction would expire before methods on the store were called.
*/
function getStore(db, mode) {
if (!mode) {
throw new Error("mode is required");
}
return db.objectStore(STORE_NAME, mode);
}
export const AddonRollouts = {
STATE_ACTIVE: "active",
STATE_ROLLED_BACK: "rolled-back",
async init() {
for (const rollout of await this.getAllActive()) {
lazy.TelemetryEnvironment.setExperimentActive(
rollout.slug,
rollout.state,
{
type: "normandy-addonrollout",
}
);
}
},
/**
* Add a new rollout
* @param {AddonRollout} rollout
*/
async add(rollout) {
const db = await getDatabase();
return getStore(db, "readwrite").add(rollout);
},
/**
* Update an existing rollout
* @param {AddonRollout} rollout
* @throws If a matching rollout does not exist.
*/
async update(rollout) {
if (!(await this.has(rollout.slug))) {
throw new Error(
`Tried to update ${rollout.slug}, but it doesn't already exist.`
);
}
const db = await getDatabase();
return getStore(db, "readwrite").put(rollout);
},
/**
* Update many existing rollouts. More efficient than calling `update` many
* times in a row.
* @param {Array<PreferenceRollout>} rollouts
* @throws If any of the passed rollouts have a slug that doesn't exist in the database already.
*/
async updateMany(rollouts) {
// Don't touch the database if there is nothing to do
if (!rollouts.length) {
return;
}
// Both of the below operations use .map() instead of a normal loop becaues
// once we get the object store, we can't let it expire by spinning the
// event loop. This approach queues up all the interactions with the store
// immediately, preventing it from expiring too soon.
const db = await getDatabase();
let store = await getStore(db, "readonly");
await Promise.all(
rollouts.map(async ({ slug }) => {
let existingRollout = await store.get(slug);
if (!existingRollout) {
throw new Error(`Tried to update ${slug}, but it doesn't exist.`);
}
})
);
// awaiting spun the event loop, so the store is now invalid. Get a new
// store. This is also a chance to get it in readwrite mode.
store = await getStore(db, "readwrite");
await Promise.all(rollouts.map(rollout => store.put(rollout)));
},
/**
* Test whether there is a rollout in storage with the given slug.
* @param {string} slug
* @returns {Promise<boolean>}
*/
async has(slug) {
const db = await getDatabase();
const rollout = await getStore(db, "readonly").get(slug);
return !!rollout;
},
/**
* Get a rollout by slug
* @param {string} slug
*/
async get(slug) {
const db = await getDatabase();
return getStore(db, "readonly").get(slug);
},
/** Get all rollouts in the database. */
async getAll() {
const db = await getDatabase();
return getStore(db, "readonly").getAll();
},
/** Get all rollouts in the "active" state. */
async getAllActive() {
const rollouts = await this.getAll();
return rollouts.filter(rollout => rollout.state === this.STATE_ACTIVE);
},
/**
* Test wrapper that temporarily replaces the stored rollout data with fake
* data for testing.
*/
withTestMock() {
return function (testFunction) {
return async function inner(...args) {
let db = await getDatabase();
const oldData = await getStore(db, "readonly").getAll();
await getStore(db, "readwrite").clear();
try {
await testFunction(...args);
} finally {
db = await getDatabase();
await getStore(db, "readwrite").clear();
const store = getStore(db, "readwrite");
await Promise.all(oldData.map(d => store.add(d)));
}
};
};
},
};