(cache)extensions/serp-domain-index-working-17597649/background.js at main · Fengsemul/extensions · GitHub

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"use strict";

const api = globalThis.browser ?? globalThis.chrome;

const META_DB_NAME = "serp-domain-label-meta";
const META_DB_VERSION = 1;
const META_STORE = "metadata";
const STATE_KEY = "state";
const IMPORT_KEY = "import-state";

const GENERATION_DB_PREFIX = "serp-domain-label-generation-";
const GENERATION_DB_VERSION = 1;
const LABEL_STORE = "labels";

const LOOKUP_LIMIT = 256;
const IMPORT_BATCH_LIMIT = 5000;
const LOOKUP_CACHE_LIMIT = 20000;
const MAX_LABEL_LENGTH = 63;
const MAX_SOURCE_COUNT = 100;

const DEFAULT_STATE = Object.freeze({
  activeGeneration: null,
  count: 0,
  enabled: true,
  revision: 0,
  importedAt: null
});

let metaDatabasePromise = null;
let state = { ...DEFAULT_STATE };
let stateLoaded = false;

const generationDatabasePromises = new Map();
const pendingGenerationDeletions = new Set();

class LruCache {
  constructor(limit) {
    this.limit = limit;
    this.values = new Map();
  }

  get(key) {
    if (!this.values.has(key)) {
      return undefined;
    }

    const value = this.values.get(key);
    this.values.delete(key);
    this.values.set(key, value);
    return value;
  }

  set(key, value) {
    if (this.values.has(key)) {
      this.values.delete(key);
    }

    this.values.set(key, value);

    if (this.values.size > this.limit) {
      const oldestKey = this.values.keys().next().value;
      this.values.delete(oldestKey);
    }
  }

  clear() {
    this.values.clear();
  }
}

const lookupCache = new LruCache(LOOKUP_CACHE_LIMIT);

function requestAsPromise(request) {
  return new Promise((resolve, reject) => {
    request.onsuccess = () => {
      resolve(request.result);
    };

    request.onerror = () => {
      reject(
        request.error ??
          new Error("An IndexedDB request failed.")
      );
    };
  });
}

function transactionAsPromise(transaction) {
  return new Promise((resolve, reject) => {
    transaction.oncomplete = () => {
      resolve();
    };

    transaction.onerror = () => {
      reject(
        transaction.error ??
          new Error("An IndexedDB transaction failed.")
      );
    };

    transaction.onabort = () => {
      reject(
        transaction.error ??
          new Error("An IndexedDB transaction was aborted.")
      );
    };
  });
}

function openMetaDatabase() {
  if (metaDatabasePromise) {
    return metaDatabasePromise;
  }

  metaDatabasePromise = new Promise((resolve, reject) => {
    const request = indexedDB.open(
      META_DB_NAME,
      META_DB_VERSION
    );

    request.onupgradeneeded = () => {
      const database = request.result;

      if (!database.objectStoreNames.contains(META_STORE)) {
        database.createObjectStore(META_STORE);
      }
    };

    request.onsuccess = () => {
      const database = request.result;

      database.onversionchange = () => {
        database.close();
        metaDatabasePromise = null;
      };

      resolve(database);
    };

    request.onerror = () => {
      metaDatabasePromise = null;
      reject(
        request.error ??
          new Error("Could not open the metadata database.")
      );

  lookupCache.clear();
  notifyFilteringChanged();

  if (importState?.generation) {
    scheduleGenerationDeletion(
      importState.generation
    );
  }

  if (activeGeneration) {
    scheduleGenerationDeletion(
      activeGeneration
    );
  }

  return publicStatus(null);
}

api.runtime.onMessage.addListener((message) => {
  if (!message || typeof message !== "object") {
    return undefined;
  }

  switch (message.type) {
    case "lookup":
      return lookupHostnames(
        message.hostnames
      ).then((blocked) => ({
        blocked,
        generation:
          state.activeGeneration,
        revision: state.revision
      }));

    case "get-status":
      return getStatus();

    case "set-settings":
      return updateSettings(message);

    case "begin-import":
      return beginImport(message);

    case "resume-import":
      return resumeImport(message);

    case "append-import-batch":
      return appendImportBatch(message);

    case "complete-import-source":
      return completeImportSource(message);

    case "finish-import":
      return finishImport(message);

    case "abandon-import":
    case "cancel-import":
      return abandonImport(message);

    case "clear-data":
      return clearAllData();

    default:
      return undefined;
  }
});

ensureStateLoaded().catch((error) => {
  console.error(
    "Could not initialize SERP Domain Label Index:",
    error
  );
});