pad.pub0.org/bin/checkPad.js

/*
 * This is a debug tool. It checks all revisions for data corruption
 */

if (process.argv.length != 3) {
  console.error("Use: node bin/checkPad.js $PADID");
  process.exit(1);
}

// get the padID
const padId = process.argv[2];

// load and initialize NPM;
let npm = require('../src/node_modules/npm');
npm.load({}, async function() {

  try {
    // initialize database
    let settings = require('../src/node/utils/Settings');
    let db = require('../src/node/db/DB');
    await db.init();

    // load modules
    let Changeset = require('ep_etherpad-lite/static/js/Changeset');
    let padManager = require('../src/node/db/PadManager');

    let exists = await padManager.doesPadExists(padId);
    if (!exists) {
      console.error("Pad does not exist");
      process.exit(1);
    }

    // get the pad
    let pad = await padManager.getPad(padId);

    // create an array with key revisions
    // key revisions always save the full pad atext
    let head = pad.getHeadRevisionNumber();
    let keyRevisions = [];
    for (let rev = 0; rev < head; rev += 100) {
      keyRevisions.push(rev);
    }

    // run through all key revisions
    for (let keyRev of keyRevisions) {

      // create an array of revisions we need till the next keyRevision or the End
      let revisionsNeeded = [];
      for (let rev = keyRev; rev <= keyRev + 100 && rev <= head; rev++) {
        revisionsNeeded.push(rev);
      }

      // this array will hold all revision changesets
      var revisions = [];

      // run through all needed revisions and get them from the database
      for (let revNum of revisionsNeeded) {
        let revision = await db.get("pad:" + padId + ":revs:" + revNum);
        revisions[revNum] = revision;
      }

      // check if the pad has a pool
      if (pad.pool === undefined ) {
        console.error("Attribute pool is missing");
        process.exit(1);
      }

      // check if there is an atext in the keyRevisions
      if (revisions[keyRev] === undefined || revisions[keyRev].meta === undefined || revisions[keyRev].meta.atext === undefined) {
        console.error("No atext in key revision " + keyRev);
        continue;
      }

      let apool = pad.pool;
      let atext = revisions[keyRev].meta.atext;

      for (let rev = keyRev + 1; rev <= keyRev + 100 && rev <= head; rev++) {
        try {
          // console.log("check revision " + rev);
          let cs = revisions[rev].changeset;
          atext = Changeset.applyToAText(cs, atext, apool);
        } catch(e) {
          console.error("Bad changeset at revision " + rev + " - " + e.message);
          continue;
        }
      }
      console.log("finished");
      process.exit(0);
    }

  } catch (e) {
    console.trace(e);
    process.exit(1);
  }
});