more WIP inactive account eviction
ansuz
4 years ago
parent
a9b95865ba
commit
5358fab615
@ -0,0 +1,520 @@
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var nThen = require("nthen");
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var Bloom = require("@mcrowe/minibloom");
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var Util = require("../lib/common-util");
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var Pins = require("../lib/pins");
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var getNewestTime = function (stats) {
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return stats[['atime', 'ctime', 'mtime'].reduce(function (a, b) {
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return stats[b] > stats[a]? b: a;
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})];
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};
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/*
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Env = {
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config: {
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inactiveTime: <number of days>,
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archiveRetentionTime: <number of days>,
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accountRetentionTime: <number of days>,
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pinPath: <filesystem path>,
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},
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store,
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pinStore,
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Log,
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blobStore,
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};
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*/
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module.exports = function (Env, cb) {
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var complete = Util.once(Util.mkAsync(cb));
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var config = Env.config;
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// the administrator should have set an 'inactiveTime' in their config
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// if they didn't, just exit.
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if (!config.inactiveTime || typeof(config.inactiveTime) !== "number") {
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return void complete("NO_INACTIVE_TIME");
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}
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// files which have not been changed since before this date can be considered inactive
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var inactiveTime = +new Date() - (config.inactiveTime * 24 * 3600 * 1000);
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// files which were archived before this date can be considered safe to remove
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var retentionTime = +new Date() - (config.archiveRetentionTime * 24 * 3600 * 1000);
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var store;
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var pinStore;
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var Log;
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var blobs;
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/* It's fairly easy to know if a channel or blob is active
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but knowing whether it is pinned requires that we
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keep the set of pinned documents in memory.
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Some users will share the same set of documents in their pin lists,
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so the representation of pinned documents should scale sub-linearly
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with the number of users and pinned documents.
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That said, sub-linear isn't great...
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A Bloom filter is "a space-efficient probabilistic data structure"
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which lets us check whether an item is _probably_ or _definitely not_
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in a set. This is good enough for our purposes since we just want to
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know whether something can safely be removed and false negatives
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(not safe to remove when it actually is) are acceptable.
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We set our capacity to some large number, and the error rate to whatever
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we think is acceptable.
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TODO make this configurable ?
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*/
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var BLOOM_CAPACITY = (1 << 20) - 1; // over a million items
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var BLOOM_ERROR = 1 / 1000; // an error rate of one in a thousand
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// we'll use one filter for the set of active documents
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var activeDocs = Bloom.optimalFilter(BLOOM_CAPACITY, BLOOM_ERROR);
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// and another one for the set of pinned documents
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var pinnedDocs = Bloom. optimalFilter(BLOOM_CAPACITY, BLOOM_ERROR);
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var startTime = +new Date();
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var msSinceStart = function () {
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return (+new Date()) - startTime;
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};
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var loadStorage = function () {
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store = Env.store;
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pinStore = Env.pinStore;
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Log = Env.Log;
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blobs = Env.blobStore;
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};
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var removeArchivedChannels = function (w) {
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// this block will iterate over archived channels and removes them
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// if they've been in cold storage for longer than your configured archive time
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// if the admin has not set an 'archiveRetentionTime', this block makes no sense
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// so just skip it
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if (typeof(config.archiveRetentionTime) !== "number") { return; }
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// count the number of files which have been removed in this run
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var removed = 0;
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var accounts = 0;
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var handler = function (err, item, cb) {
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if (err) {
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Log.error('EVICT_ARCHIVED_CHANNEL_ITERATION', err);
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return void cb();
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}
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// don't mess with files that are freshly stored in cold storage
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// based on ctime because that's changed when the file is moved...
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if (+new Date(item.ctime) > retentionTime) {
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return void cb();
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}
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// but if it's been stored for the configured time...
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// expire it
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store.removeArchivedChannel(item.channel, w(function (err) {
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if (err) {
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Log.error('EVICT_ARCHIVED_CHANNEL_REMOVAL_ERROR', {
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error: err,
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channel: item.channel,
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});
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return void cb();
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}
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Log.info('EVICT_ARCHIVED_CHANNEL_REMOVAL', item.channel);
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if (item.channel.length === 32) {
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removed++;
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} else if (item.channel.length === 44) {
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accounts++;
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}
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cb();
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}));
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};
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// if you hit an error, log it
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// otherwise, when there are no more channels to process
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// log some stats about how many were removed
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var done = function (err) {
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if (err) {
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return Log.error('EVICT_ARCHIVED_FINAL_ERROR', err);
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}
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Log.info('EVICT_ARCHIVED_CHANNELS_REMOVED', removed);
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Log.info('EVICT_ARCHIVED_ACCOUNTS_REMOVED', accounts);
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};
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store.listArchivedChannels(handler, w(done));
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};
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var removeArchivedBlobProofs = function (w) {
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if (typeof(config.archiveRetentionTime) !== "number") { return; }
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// Iterate over archive blob ownership proofs and remove them
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// if they are older than the specified retention time
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var removed = 0;
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blobs.list.archived.proofs(function (err, item, next) {
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if (err) {
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Log.error("EVICT_BLOB_LIST_ARCHIVED_PROOF_ERROR", err);
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return void next();
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}
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if (item && getNewestTime(item) > retentionTime) { return void next(); }
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blobs.remove.archived.proof(item.safeKey, item.blobId, (function (err) {
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if (err) {
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Log.error("EVICT_ARCHIVED_BLOB_PROOF_ERROR", item);
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return void next();
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}
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Log.info("EVICT_ARCHIVED_BLOB_PROOF", item);
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removed++;
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next();
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}));
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}, w(function () {
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Log.info('EVICT_ARCHIVED_BLOB_PROOFS_REMOVED', removed);
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}));
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};
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var removeArchivedBlobs = function (w) {
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if (typeof(config.archiveRetentionTime) !== "number") { return; }
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// Iterate over archived blobs and remove them
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// if they are older than the specified retention time
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var removed = 0;
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blobs.list.archived.blobs(function (err, item, next) {
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if (err) {
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Log.error("EVICT_BLOB_LIST_ARCHIVED_BLOBS_ERROR", err);
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return void next();
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}
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if (item && getNewestTime(item) > retentionTime) { return void next(); }
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blobs.remove.archived.blob(item.blobId, function (err) {
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if (err) {
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Log.error("EVICT_ARCHIVED_BLOB_ERROR", item);
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return void next();
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}
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Log.info("EVICT_ARCHIVED_BLOB", item);
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removed++;
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next();
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});
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}, w(function () {
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Log.info('EVICT_ARCHIVED_BLOBS_REMOVED', removed);
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}));
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};
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var categorizeChannelsByActivity = function (w) {
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var channels = 0;
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var active = 0;
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var handler = function (err, item, cb) {
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channels++;
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if (err) {
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Log.error('EVICT_CHANNEL_CATEGORIZATION', err);
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return void cb();
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}
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// if the channel has been modified recently
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// we don't use mtime because we don't want to count access to the file, just modifications
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if (+new Date(item.mtime) > inactiveTime) {
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// add it to the set of activeDocs
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activeDocs.add(item.channel);
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active++;
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return void cb();
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}
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return void cb();
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};
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var done = function () {
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Log.info('EVICT_CHANNELS_CATEGORIZED', {
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active: active,
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channels: channels,
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});
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};
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store.listChannels(handler, w(done));
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};
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var categorizeBlobsByActivity = function (w) {
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var n_blobs = 0;
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var active = 0;
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blobs.list.blobs(function (err, item, next) {
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n_blobs++;
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if (err) {
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Log.error("EVICT_BLOB_CATEGORIZATION", err);
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return void next();
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}
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if (!item) {
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next();
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return void Log.error("EVICT_BLOB_CATEGORIZATION_INVALID", item);
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}
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if (getNewestTime(item) > inactiveTime) {
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activeDocs.add(item.blobId);
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active++;
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return void next();
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}
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next();
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}, w(function () {
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Log.info('EVICT_BLOBS_CATEGORIZED', {
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active: active,
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blobs: n_blobs,
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});
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}));
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};
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var categorizeAccountsByActivity = function (w) {
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// iterate over all accounts
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var accounts = 0;
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var inactive = 0;
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var accountRetentionTime;
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if (typeof(config.accountRetentionTime) === 'number' && config.accountRetentionTime > 0) {
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accountRetentionTime = +new Date() - (24 * 3600 * 1000 * config.accountRetentionTime);
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} else {
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accountRetentionTime = -1;
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}
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var pinAll = function (pinList) {
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pinList.forEach(function (docId) {
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pinnedDocs.add(docId);
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});
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};
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var accountIsActive = function (mtime, pinList) {
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// XXX don't ever delete premium accounts...
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// if their pin log has changed recently then consider them active
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if (mtime && mtime > accountRetentionTime) {
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return true;
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}
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// otherwise iterate over their pinned documents until you find one that has been active
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return pinList.some(function (docId) {
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return activeDocs.test(docId);
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});
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};
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var PRESERVE_INACTIVE_ACCOUNTS = accountRetentionTime <= 0;
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// otherwise, we'll only retain data from active accounts
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// so we need more heuristics
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var handler = function (content, id, next) {
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accounts++;
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var mtime = content.latest;
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var pinList = Object.keys(content.pins);
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if (accountIsActive(mtime, pinList)) {
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// add active accounts' pinned documents to a second bloom filter
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pinAll(pinList);
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return void next();
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}
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// Otherwise they are inactive.
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// We keep track of how many accounts are inactive whether or not
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// we plan to delete them, because it may be interesting information
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inactive++;
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if (PRESERVE_INACTIVE_ACCOUNTS) {
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pinAll(pinList);
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return void next();
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}
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// remove the pin logs of inactive accounts if inactive account removal is configured
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pinStore.archiveChannel(id, function (err) {
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if (err) {
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Log.error('EVICT_INACTIVE_ACCOUNT_PIN_LOG', err);
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return void next();
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}
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Log.info('EVICT_INACTIVE_ACCOUNT_LOG', id);
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next();
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});
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};
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var done = function () {
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var label = PRESERVE_INACTIVE_ACCOUNTS?
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"EVICT_COUNT_ACCOUNTS":
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"EVICT_INACTIVE_ACCOUNTS";
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Log.info(label, {
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accounts: accounts,
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inactive: inactive,
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});
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};
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Pins.load(w(done), {
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pinPath: config.pinPath,
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handler: handler,
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});
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};
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var archiveInactiveBlobs = function (w) {
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// iterate over blobs and remove them
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// if they have not been accessed within the specified retention time
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var removed = 0;
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blobs.list.blobs(function (err, item, next) {
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if (err) {
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Log.error("EVICT_BLOB_LIST_BLOBS_ERROR", err);
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return void next();
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}
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if (!item) {
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next();
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return void Log.error('EVICT_BLOB_LIST_BLOBS_NO_ITEM', item);
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}
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if (pinnedDocs.test(item.blobId)) { return void next(); }
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if (activeDocs.test(item.blobId)) { return void next(); }
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// This seems redundant because we're already checking the bloom filter
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// but we can't implement a 'fast mode' for the iterator
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// unless we address this race condition with this last-minute double-check
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if (getNewestTime(item) > inactiveTime) { return void next(); }
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blobs.archive.blob(item.blobId, function (err) {
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if (err) {
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Log.error("EVICT_ARCHIVE_BLOB_ERROR", {
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error: err,
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item: item,
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});
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return void next();
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}
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Log.info("EVICT_ARCHIVE_BLOB", {
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item: item,
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});
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removed++;
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next();
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});
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}, w(function () {
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Log.info('EVICT_BLOBS_REMOVED', removed);
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}));
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};
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var archiveInactiveBlobProofs = function (w) {
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// iterate over blob proofs and remove them
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// if they don't correspond to a pinned or active file
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var removed = 0;
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blobs.list.proofs(function (err, item, next) {
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if (err) {
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next();
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return void Log.error("EVICT_BLOB_LIST_PROOFS_ERROR", err);
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}
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if (!item) {
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next();
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return void Log.error('EVICT_BLOB_LIST_PROOFS_NO_ITEM', item);
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}
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if (pinnedDocs.test(item.blobId)) { return void next(); }
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if (getNewestTime(item) > inactiveTime) { return void next(); }
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nThen(function (w) {
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blobs.size(item.blobId, w(function (err, size) {
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if (err) {
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w.abort();
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next();
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return void Log.error("EVICT_BLOB_LIST_PROOFS_ERROR", err);
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}
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if (size !== 0) {
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w.abort();
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next();
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}
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}));
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}).nThen(function () {
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blobs.remove.proof(item.safeKey, item.blobId, function (err) {
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next();
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if (err) {
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return Log.error("EVICT_BLOB_PROOF_LONELY_ERROR", item);
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}
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removed++;
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return Log.info("EVICT_BLOB_PROOF_LONELY", item);
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});
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});
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}, w(function () {
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Log.info("EVICT_BLOB_PROOFS_REMOVED", removed);
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}));
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};
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var archiveInactiveChannels = function (w) {
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var channels = 0;
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var archived = 0;
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var handler = function (err, item, cb) {
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channels++;
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if (err) {
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Log.error('EVICT_CHANNEL_ITERATION', err);
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return void cb();
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}
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// check if the database has any ephemeral channels
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// if it does it's because of a bug, and they should be removed
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if (item.channel.length === 34) {
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return void store.removeChannel(item.channel, w(function (err) {
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if (err) {
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Log.error('EVICT_EPHEMERAL_CHANNEL_REMOVAL_ERROR', {
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error: err,
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channel: item.channel,
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});
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return void cb();
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}
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Log.info('EVICT_EPHEMERAL_CHANNEL_REMOVAL', item.channel);
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cb();
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}));
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}
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// bail out if the channel is in the set of activeDocs
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if (activeDocs.test(item.channel)) { return void cb(); }
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// ignore the channel if it's pinned
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if (pinnedDocs.test(item.channel)) { return void cb(); }
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nThen(function (w) {
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// double check that the channel really is inactive before archiving it
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// because it might have been created after the initial activity scan
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store.getChannelStats(item.channel, w(function (err, newerItem) {
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if (err) { return; }
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if (item && getNewestTime(newerItem) > retentionTime) {
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// it's actually active, so don't archive it.
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w.abort();
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cb();
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}
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// else fall through to the archival
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}));
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}).nThen(function () {
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return void store.archiveChannel(item.channel, w(function (err) {
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if (err) {
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Log.error('EVICT_CHANNEL_ARCHIVAL_ERROR', {
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error: err,
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channel: item.channel,
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});
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return void cb();
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}
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Log.info('EVICT_CHANNEL_ARCHIVAL', item.channel);
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archived++;
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cb();
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}));
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});
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};
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var done = function () {
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return void Log.info('EVICT_CHANNELS_ARCHIVED', archived);
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};
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store.listChannels(handler, w(done), true); // using a hacky "fast mode" since we only need the channel id
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};
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nThen(loadStorage)
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.nThen(function () {
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Log.info("EVICT_TIME_TO_LOAD_PINS", msSinceStart());
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})
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.nThen(removeArchivedChannels)
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.nThen(removeArchivedBlobProofs)
|
||||
.nThen(removeArchivedBlobs)
|
||||
|
||||
// iterate over all documents and add them to a bloom filter if they have been active
|
||||
.nThen(categorizeChannelsByActivity)
|
||||
.nThen(categorizeBlobsByActivity)
|
||||
|
||||
// iterate over all accounts and add them to a bloom filter if they are active
|
||||
.nThen(categorizeAccountsByActivity)
|
||||
|
||||
// iterate again and archive inactive unpinned documents
|
||||
// (documents which are not in either bloom filter)
|
||||
|
||||
.nThen(archiveInactiveBlobs)
|
||||
.nThen(archiveInactiveBlobProofs)
|
||||
.nThen(archiveInactiveChannels)
|
||||
.nThen(function () {
|
||||
Log.info("EVICT_TIME_TO_RUN_SCRIPT", msSinceStart());
|
||||
}).nThen(function () {
|
||||
complete();
|
||||
});
|
||||
};
|
||||
Loading…
Reference in New Issue