pad.pub0.org/bin/rebuildPad.js

116 lines
4.3 KiB
JavaScript

'use strict';
/*
This is a repair tool. It rebuilds an old pad at a new pad location up to a
known "good" revision.
*/
// As of v14, Node.js does not exit when there is an unhandled Promise rejection. Convert an
// unhandled rejection into an uncaught exception, which does cause Node.js to exit.
process.on('unhandledRejection', (err) => { throw err; });
if (process.argv.length !== 4 && process.argv.length !== 5) {
throw new Error('Use: node bin/repairPad.js $PADID $REV [$NEWPADID]');
}
const async = require('ep_etherpad-lite/node_modules/async');
const npm = require('ep_etherpad-lite/node_modules/npm');
const util = require('util');
const padId = process.argv[2];
const newRevHead = process.argv[3];
const newPadId = process.argv[4] || `${padId}-rebuilt`;
let db, oldPad, newPad;
let Pad, PadManager;
async.series([
(callback) => npm.load({}, callback),
(callback) => {
// Get a handle into the database
db = require('ep_etherpad-lite/node/db/DB');
db.init(callback);
},
(callback) => {
Pad = require('ep_etherpad-lite/node/db/Pad').Pad;
PadManager = require('ep_etherpad-lite/node/db/PadManager');
// Get references to the original pad and to a newly created pad
// HACK: This is a standalone script, so we want to write everything
// out to the database immediately. The only problem with this is
// that a driver (like the mysql driver) can hardcode these values.
db.db.db.settings = {cache: 0, writeInterval: 0, json: true};
// Validate the newPadId if specified and that a pad with that ID does
// not already exist to avoid overwriting it.
if (!PadManager.isValidPadId(newPadId)) {
throw new Error('Cannot create a pad with that id as it is invalid');
}
PadManager.doesPadExists(newPadId, (err, exists) => {
if (exists) throw new Error('Cannot create a pad with that id as it already exists');
});
PadManager.getPad(padId, (err, pad) => {
oldPad = pad;
newPad = new Pad(newPadId);
callback();
});
},
(callback) => {
// Clone all Chat revisions
const chatHead = oldPad.chatHead;
for (let i = 0, curHeadNum = 0; i <= chatHead; i++) {
db.db.get(`pad:${padId}:chat:${i}`, (err, chat) => {
db.db.set(`pad:${newPadId}:chat:${curHeadNum++}`, chat);
console.log(`Created: Chat Revision: pad:${newPadId}:chat:${curHeadNum}`);
});
}
callback();
},
(callback) => {
// Rebuild Pad from revisions up to and including the new revision head
const AuthorManager = require('ep_etherpad-lite/node/db/AuthorManager');
const Changeset = require('ep_etherpad-lite/static/js/Changeset');
// Author attributes are derived from changesets, but there can also be
// non-author attributes with specific mappings that changesets depend on
// and, AFAICT, cannot be recreated any other way
newPad.pool.numToAttrib = oldPad.pool.numToAttrib;
for (let curRevNum = 0; curRevNum <= newRevHead; curRevNum++) {
db.db.get(`pad:${padId}:revs:${curRevNum}`, (err, rev) => {
if (rev.meta) {
throw new Error('The specified revision number could not be found.');
}
const newRevNum = ++newPad.head;
const newRevId = `pad:${newPad.id}:revs:${newRevNum}`;
db.db.set(newRevId, rev);
AuthorManager.addPad(rev.meta.author, newPad.id);
newPad.atext = Changeset.applyToAText(rev.changeset, newPad.atext, newPad.pool);
console.log(`Created: Revision: pad:${newPad.id}:revs:${newRevNum}`);
if (newRevNum === newRevHead) {
callback();
}
});
}
},
(callback) => {
// Add saved revisions up to the new revision head
console.log(newPad.head);
const newSavedRevisions = [];
for (const savedRev of oldPad.savedRevisions) {
if (savedRev.revNum <= newRevHead) {
newSavedRevisions.push(savedRev);
console.log(`Added: Saved Revision: ${savedRev.revNum}`);
}
}
newPad.savedRevisions = newSavedRevisions;
callback();
},
(callback) => {
// Save the source pad
db.db.set(`pad:${newPadId}`, newPad, (err) => {
console.log(`Created: Source Pad: pad:${newPadId}`);
util.callbackify(newPad.saveToDatabase.bind(newPad))(callback);
});
},
], (err) => {
if (err) throw err;
console.info('finished');
});