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Diffstat (limited to '')
| -rw-r--r-- | toolkit/components/normandy/lib/PreferenceRollouts.jsm | 366 |
1 files changed, 366 insertions, 0 deletions
diff --git a/toolkit/components/normandy/lib/PreferenceRollouts.jsm b/toolkit/components/normandy/lib/PreferenceRollouts.jsm new file mode 100644 index 0000000000..05ea83cf58 --- /dev/null +++ b/toolkit/components/normandy/lib/PreferenceRollouts.jsm @@ -0,0 +1,366 @@ +/* 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 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +"use strict"; + +const { LogManager } = ChromeUtils.import( + "resource://normandy/lib/LogManager.jsm" +); +const lazy = {}; +ChromeUtils.defineESModuleGetters(lazy, { + IndexedDB: "resource://gre/modules/IndexedDB.sys.mjs", + TelemetryEnvironment: "resource://gre/modules/TelemetryEnvironment.sys.mjs", +}); +ChromeUtils.defineModuleGetter( + lazy, + "CleanupManager", + "resource://normandy/lib/CleanupManager.jsm" +); +ChromeUtils.defineModuleGetter( + lazy, + "PrefUtils", + "resource://normandy/lib/PrefUtils.jsm" +); +ChromeUtils.defineModuleGetter( + lazy, + "TelemetryEvents", + "resource://normandy/lib/TelemetryEvents.jsm" +); + +const log = LogManager.getLogger("recipe-runner"); + +/** + * PreferenceRollouts store info about an active or expired preference rollout. + * @typedef {object} PreferenceRollout + * @property {string} slug + * Unique slug of the experiment + * @property {string} state + * The current state of the rollout: "active", "rolled-back", "graduated". + * 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. Graduated means that the built-in default now matches the + * rollout value, and so Normandy is no longer managing the preference. + * @property {Array<PreferenceSpec>} preferences + * An array of preferences specifications involved in the rollout. + * @property {string} enrollmentId + * A random ID generated at time of enrollment. It should be included on all + * telemetry related to this rollout. It should not be re-used by other + * rollouts, or any other purpose. May be null on old rollouts. + */ + +/** + * PreferenceSpec describe how a preference should change during a rollout. + * @typedef {object} PreferenceSpec + * @property {string} preferenceName + * The preference to modify. + * @property {string} preferenceType + * Type of the preference being set. + * @property {string|integer|boolean} value + * The value to change the preference to. + * @property {string|integer|boolean} previousValue + * The value the preference would have on the default branch if this rollout + * were not active. + */ + +var EXPORTED_SYMBOLS = ["PreferenceRollouts"]; +const STARTUP_PREFS_BRANCH = "app.normandy.startupRolloutPrefs."; +const DB_NAME = "normandy-preference-rollout"; +const STORE_NAME = "preference-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); +} + +var PreferenceRollouts = { + STATE_ACTIVE: "active", + STATE_ROLLED_BACK: "rolled-back", + STATE_GRADUATED: "graduated", + + // A set of rollout slugs that are obsolete based on the code in this build of + // Firefox. This may include things like the preference no longer being + // applicable, or the feature changing in such a way that Normandy's automatic + // graduation system cannot detect that the rollout should hand off to the + // built-in code. + GRADUATION_SET: new Set([ + "pref-webrender-intel-rollout-70-release", + "bug-1703186-rollout-http3-support-release-88-89", + "rollout-doh-nightly-rollout-to-all-us-desktop-users-nightly-74-80-bug-1613481", + "rollout-doh-beta-rollout-to-all-us-desktop-users-v2-beta-74-80-bug-1613489", + "rollout-doh-us-staged-rollout-to-all-us-desktop-users-release-73-77-bug-1586331", + "bug-1648229-rollout-comcast-steering-rollout-release-78-80", + "bug-1732206-rollout-fission-release-rollout-release-94-95", + "bug-1745237-rollout-fission-beta-96-97-rollout-beta-96-97", + "bug-1750601-rollout-doh-steering-in-canada-staggered-starting-for-release-97-98", + "bug-1758988-rollout-doh-enablment-to-new-countries-staggered-st-release-98-100", + "bug-1758818-rollout-enabling-doh-in-new-countries-staggered-sta-release-98-100", + ]), + + /** + * Update the rollout database with changes that happened during early startup. + * @param {object} rolloutPrefsChanged Map from pref name to previous pref value + */ + async recordOriginalValues(originalPreferences) { + for (const rollout of await this.getAllActive()) { + let shouldSaveRollout = false; + + // Count the number of preferences in this rollout that are now redundant. + let prefMatchingDefaultCount = 0; + + for (const prefSpec of rollout.preferences) { + const builtInDefault = originalPreferences[prefSpec.preferenceName]; + if (prefSpec.value === builtInDefault) { + prefMatchingDefaultCount++; + } + // Store the current built-in default. That way, if the preference is + // rolled back during the current session (ie, until the browser is + // shut down), the correct value will be used. + if (prefSpec.previousValue !== builtInDefault) { + prefSpec.previousValue = builtInDefault; + shouldSaveRollout = true; + } + } + + if (prefMatchingDefaultCount === rollout.preferences.length) { + // Firefox's builtin defaults have caught up to the rollout, making all + // of the rollout's changes redundant, so graduate the rollout. + await this.graduate(rollout, "all-prefs-match"); + // `this.graduate` writes the rollout to the db, so we don't need to do it anymore. + shouldSaveRollout = false; + } + + if (shouldSaveRollout) { + const db = await getDatabase(); + await getStore(db, "readwrite").put(rollout); + } + } + }, + + async init() { + lazy.CleanupManager.addCleanupHandler(() => this.saveStartupPrefs()); + + for (const rollout of await this.getAllActive()) { + if (this.GRADUATION_SET.has(rollout.slug)) { + await this.graduate(rollout, "in-graduation-set"); + continue; + } + lazy.TelemetryEnvironment.setExperimentActive( + rollout.slug, + rollout.state, + { + type: "normandy-prefrollout", + enrollmentId: + rollout.enrollmentId || + lazy.TelemetryEvents.NO_ENROLLMENT_ID_MARKER, + } + ); + } + }, + + /** When Telemetry is disabled, clear all identifiers from the stored rollouts. */ + async onTelemetryDisabled() { + const rollouts = await this.getAll(); + for (const rollout of rollouts) { + rollout.enrollmentId = lazy.TelemetryEvents.NO_ENROLLMENT_ID_MARKER; + } + await this.updateMany(rollouts); + }, + + /** + * Test wrapper that temporarily replaces the stored rollout data with fake + * data for testing. + */ + withTestMock({ + graduationSet = new Set(), + rollouts: prefRollouts = [], + } = {}) { + return testFunction => { + return async args => { + let db = await getDatabase(); + const oldData = await getStore(db, "readonly").getAll(); + await getStore(db, "readwrite").clear(); + await Promise.all(prefRollouts.map(r => this.add(r))); + const oldGraduationSet = this.GRADUATION_SET; + this.GRADUATION_SET = graduationSet; + + try { + await testFunction({ ...args, prefRollouts }); + } finally { + this.GRADUATION_SET = oldGraduationSet; + db = await getDatabase(); + await getStore(db, "readwrite").clear(); + const store = getStore(db, "readwrite"); + await Promise.all(oldData.map(d => store.add(d))); + } + }; + }; + }, + + /** + * Add a new rollout + * @param {PreferenceRollout} rollout + */ + async add(rollout) { + if (!rollout.enrollmentId) { + throw new Error("Rollout must have an enrollment ID"); + } + const db = await getDatabase(); + return getStore(db, "readwrite").add(rollout); + }, + + /** + * Update an existing rollout + * @param {PreferenceRollout} 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 {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); + }, + + /** + * Save in-progress preference rollouts in a sub-branch of the normandy prefs. + * On startup, we read these to set the rollout values. + */ + async saveStartupPrefs() { + const prefBranch = Services.prefs.getBranch(STARTUP_PREFS_BRANCH); + for (const pref of prefBranch.getChildList("")) { + prefBranch.clearUserPref(pref); + } + + for (const rollout of await this.getAllActive()) { + for (const prefSpec of rollout.preferences) { + lazy.PrefUtils.setPref( + STARTUP_PREFS_BRANCH + prefSpec.preferenceName, + prefSpec.value + ); + } + } + }, + + async graduate(rollout, reason) { + log.debug(`Graduating rollout: ${rollout.slug}`); + rollout.state = this.STATE_GRADUATED; + const db = await getDatabase(); + await getStore(db, "readwrite").put(rollout); + lazy.TelemetryEvents.sendEvent( + "graduate", + "preference_rollout", + rollout.slug, + { + reason, + enrollmentId: + rollout.enrollmentId || lazy.TelemetryEvents.NO_ENROLLMENT_ID_MARKER, + } + ); + }, +}; |