Restore pad to new location at a given revision
This script gives an admin with shell access the ability to restore a pad at a given revision by essentially rebuilding it at a new location with data associated with the original pad. The upsides to creating a new pad vs. changing the original are: 1) avoiding service disruptions (no deletes, no moving targets - builds from previous revision); and 2) preservation of data (no deletes, no overwriting of the source pad). The most obvious downside is the pad has a new ID which could require folks to update their links, bookmarks, etc. to point at the new location.
This commit is contained in:
Timothy Chavez
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/*
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This is a repair tool. It rebuilds an old pad at a new pad location up to a
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known "good" revision.
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*/
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if(process.argv.length != 4) {
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console.error("Use: node bin/repairPad.js $PADID $REV");
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process.exit(1);
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}
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var npm = require("../src/node_modules/npm");
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var async = require("../src/node_modules/async");
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var ueberDB = require("../src/node_modules/ueberDB");
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var padId = process.argv[2];
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var newRevHead = process.argv[3];
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var newPadId = padId + "-rebuilt";
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var db, pad, newPad, settings;
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var AuthorManager, ChangeSet, PadManager;
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async.series([
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function(callback) {
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npm.load({}, function(err) {
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if(err) {
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console.error("Could not load NPM: " + err)
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process.exit(1);
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} else {
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callback();
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}
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})
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},
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function(callback) {
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// Get a handle into the database
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db = require('../src/node/db/DB');
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db.init(callback);
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}, function(callback) {
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// Get references to the original pad and to a newly created pad
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// HACK: This is a standalone script, so we want to write everything
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// out to the database immediately. The only problem with this is
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// that a driver (like the mysql driver) hardcodes these values.
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db.db.db.settings = {cache: 0, writeInterval: 0, json: true};
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PadManager = require('../src/node/db/PadManager');
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PadManager.getPad(padId, function(err, _pad) {
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pad = _pad;
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PadManager.getPad(newPadId, function(err, _newPad) {
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newPad = _newPad;
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callback();
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});
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});
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}, function(callback) {
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// Clone all Chat revisions
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var chatHead = pad.chatHead;
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for(var i = 0; i <= chatHead; i++) {
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db.db.get("pad:" + padId + ":chat:" + i, function (err, chat) {
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db.db.set("pad:" + newPadId + ":chat:" + i, chat);
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console.log("Created: Chat Revision: pad:" + newPadId + ":chat:" + i)
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});
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}
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callback();
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}, function(callback) {
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// Rebuild Pad from revisions up to and including the new revision head
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AuthorManager = require("../src/node/db/AuthorManager");
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Changeset = require("ep_etherpad-lite/static/js/Changeset");
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// Author attributes are derived from changesets, but there can also be
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// non-author attributes with specific mappings that changesets depend on
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// and, AFAICT, cannot be recreated any other way
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newPad.pool.numToAttrib = pad.pool.numToAttrib;
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for(var i = 1; i <= newRevHead; i++) {
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db.db.get("pad:" + padId + ":revs:" + i, function(err, rev) {
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var author = rev.meta.author;
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var timestamp = rev.meta.timestamp;
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var changeset = rev.changeset;
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var newAText = Changeset.applyToAText(changeset, newPad.atext, newPad.pool);
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Changeset.copyAText(newAText, newPad.atext);
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var newRev = ++newPad.head;
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var newRevData = {};
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newRevData.changeset = changeset;
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newRevData.meta = {};
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newRevData.meta.author = author;
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newRevData.meta.timestamp = timestamp;
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newPad.pool.putAttrib(['author', author || '']);
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if(newRev % 100 == 0)
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{
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newRevData.meta.atext = newPad.atext;
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}
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db.db.set("pad:"+newPad.id+":revs:"+newRev, newRevData);
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console.log("Created: Revision: pad:" + newPad.id + ":revs:" + newRev);
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if(author)
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AuthorManager.addPad(author, newPad.id);
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if (newRev == newRevHead) {
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callback();
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}
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});
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}
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}, function(callback) {
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// Add saved revisions up to the new revision head
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console.log(newPad.head);
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var newSavedRevisions = [];
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for(var i in pad.savedRevisions) {
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savedRev = pad.savedRevisions[i]
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if (savedRev.revNum <= newRevHead) {
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newSavedRevisions.push(savedRev);
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console.log("Added: Saved Revision: " + savedRev.revNum);
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}
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}
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newPad.savedRevisions = newSavedRevisions;
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callback();
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}, function(callback) {
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// Save the source pad
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db.db.set("pad:"+newPadId, newPad, function(err) {
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console.log("Created: Source Pad: pad:" + newPadId);
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newPad.saveToDatabase();
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callback();
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});
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}
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], function (err) {
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if(err) throw err;
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else {
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console.info("finished");
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process.exit(0);
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}
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});
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