Refactor streaming's filtering logic & improve documentation (#26213)
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Emelia Smith
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@ -622,29 +622,39 @@ const startServer = async () => {
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log.verbose(req.requestId, `Starting stream from ${ids.join(', ')} for ${accountId}`);
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// Currently message is of type string, soon it'll be Record<string, any>
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const transmit = (event, payload) => {
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// TODO: Replace "string"-based delete payloads with object payloads:
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const encodedPayload = typeof payload === 'object' ? JSON.stringify(payload) : payload;
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log.silly(req.requestId, `Transmitting for ${accountId}: ${event} ${encodedPayload}`);
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output(event, encodedPayload);
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};
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// The listener used to process each message off the redis subscription,
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// message here is an object with an `event` and `payload` property. Some
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// events also include a queued_at value, but this is being removed shortly.
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const listener = message => {
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const { event, payload, queued_at } = message;
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const { event, payload } = message;
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const transmit = (payload) => {
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const now = new Date().getTime();
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const delta = now - queued_at;
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const encodedPayload = typeof payload === 'object' ? JSON.stringify(payload) : payload;
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log.silly(req.requestId, `Transmitting for ${accountId}: ${event} ${encodedPayload} Delay: ${delta}ms`);
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output(event, encodedPayload);
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};
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// Only messages that may require filtering are statuses, since notifications
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// are already personalized and deletes do not matter
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if (!needsFiltering || event !== 'update') {
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transmit(payload);
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// Streaming only needs to apply filtering to some channels and only to
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// some events. This is because majority of the filtering happens on the
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// Ruby on Rails side when producing the event for streaming.
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//
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// The only events that require filtering from the streaming server are
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// `update` and `status.update`, all other events are transmitted to the
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// client as soon as they're received (pass-through).
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//
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// The channels that need filtering are determined in the function
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// `channelNameToIds` defined below:
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if (!needsFiltering || (event !== 'update' && event !== 'status.update')) {
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transmit(event, payload);
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return;
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}
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const targetAccountIds = [payload.account.id].concat(payload.mentions.map(item => item.id));
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const accountDomain = payload.account.acct.split('@')[1];
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// The rest of the logic from here on in this function is to handle
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// filtering of statuses:
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// Filter based on language:
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if (Array.isArray(req.chosenLanguages) && payload.language !== null && req.chosenLanguages.indexOf(payload.language) === -1) {
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log.silly(req.requestId, `Message ${payload.id} filtered by language (${payload.language})`);
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return;
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@ -652,11 +662,16 @@ const startServer = async () => {
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// When the account is not logged in, it is not necessary to confirm the block or mute
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if (!req.accountId) {
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transmit(payload);
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transmit(event, payload);
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return;
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}
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pgPool.connect((err, client, done) => {
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// Filter based on domain blocks, blocks, mutes, or custom filters:
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const targetAccountIds = [payload.account.id].concat(payload.mentions.map(item => item.id));
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const accountDomain = payload.account.acct.split('@')[1];
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// TODO: Move this logic out of the message handling loop
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pgPool.connect((err, client, releasePgConnection) => {
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if (err) {
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log.error(err);
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return;
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@ -683,28 +698,45 @@ const startServer = async () => {
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}
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Promise.all(queries).then(values => {
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done();
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releasePgConnection();
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// Handling blocks & mutes and domain blocks: If one of those applies,
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// then we don't transmit the payload of the event to the client
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if (values[0].rows.length > 0 || (accountDomain && values[1].rows.length > 0)) {
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return;
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}
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if (!payload.filtered && !req.cachedFilters) {
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// If the payload already contains the `filtered` property, it means
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// that filtering has been applied on the ruby on rails side, as
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// such, we don't need to construct or apply the filters in streaming:
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if (Object.prototype.hasOwnProperty.call(payload, "filtered")) {
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transmit(event, payload);
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return;
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}
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// Handling for constructing the custom filters and caching them on the request
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// TODO: Move this logic out of the message handling lifecycle
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if (!req.cachedFilters) {
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const filterRows = values[accountDomain ? 2 : 1].rows;
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req.cachedFilters = filterRows.reduce((cache, row) => {
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if (cache[row.id]) {
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cache[row.id].keywords.push([row.keyword, row.whole_word]);
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req.cachedFilters = filterRows.reduce((cache, filter) => {
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if (cache[filter.id]) {
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cache[filter.id].keywords.push([filter.keyword, filter.whole_word]);
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} else {
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cache[row.id] = {
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keywords: [[row.keyword, row.whole_word]],
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expires_at: row.expires_at,
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repr: {
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id: row.id,
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title: row.title,
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context: row.context,
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expires_at: row.expires_at,
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filter_action: ['warn', 'hide'][row.filter_action],
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cache[filter.id] = {
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keywords: [[filter.keyword, filter.whole_word]],
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expires_at: filter.expires_at,
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filter: {
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id: filter.id,
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title: filter.title,
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context: filter.context,
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expires_at: filter.expires_at,
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// filter.filter_action is the value from the
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// custom_filters.action database column, it is an integer
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// representing a value in an enum defined by Ruby on Rails:
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//
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// enum { warn: 0, hide: 1 }
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filter_action: ['warn', 'hide'][filter.filter_action],
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},
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};
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}
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@ -712,6 +744,10 @@ const startServer = async () => {
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return cache;
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}, {});
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// Construct the regular expressions for the custom filters: This
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// needs to be done in a separate loop as the database returns one
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// filterRow per keyword, so we need all the keywords before
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// constructing the regular expression
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Object.keys(req.cachedFilters).forEach((key) => {
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req.cachedFilters[key].regexp = new RegExp(req.cachedFilters[key].keywords.map(([keyword, whole_word]) => {
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let expr = keyword.replace(/[.*+?^${}()|[\]\\]/g, '\\$&');
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@ -731,34 +767,56 @@ const startServer = async () => {
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});
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}
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// Check filters
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if (req.cachedFilters && !payload.filtered) {
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const mutatedPayload = { ...payload };
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// Apply cachedFilters against the payload, constructing a
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// `filter_results` array of FilterResult entities
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if (req.cachedFilters) {
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const status = payload;
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const searchContent = ([status.spoiler_text || '', status.content].concat((status.poll && status.poll.options) ? status.poll.options.map(option => option.title) : [])).concat(status.media_attachments.map(att => att.description)).join('\n\n').replace(/<br\s*\/?>/g, '\n').replace(/<\/p><p>/g, '\n\n');
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const searchIndex = JSDOM.fragment(searchContent).textContent;
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// TODO: Calculate searchableContent in Ruby on Rails:
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const searchableContent = ([status.spoiler_text || '', status.content].concat((status.poll && status.poll.options) ? status.poll.options.map(option => option.title) : [])).concat(status.media_attachments.map(att => att.description)).join('\n\n').replace(/<br\s*\/?>/g, '\n').replace(/<\/p><p>/g, '\n\n');
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const searchableTextContent = JSDOM.fragment(searchableContent).textContent;
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const now = new Date();
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mutatedPayload.filtered = [];
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Object.values(req.cachedFilters).forEach((cachedFilter) => {
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if ((cachedFilter.expires_at === null || cachedFilter.expires_at > now)) {
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const keyword_matches = searchIndex.match(cachedFilter.regexp);
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if (keyword_matches) {
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mutatedPayload.filtered.push({
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filter: cachedFilter.repr,
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keyword_matches,
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});
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}
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const filter_results = Object.values(req.cachedFilters).reduce((results, cachedFilter) => {
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// Check the filter hasn't expired before applying:
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if (cachedFilter.expires_at !== null && cachedFilter.expires_at < now) {
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return;
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}
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});
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transmit(mutatedPayload);
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// Just in-case JSDOM fails to find textContent in searchableContent
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if (!searchableTextContent) {
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return;
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}
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const keyword_matches = searchableTextContent.match(cachedFilter.regexp);
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if (keyword_matches) {
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// results is an Array of FilterResult; status_matches is always
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// null as we only are only applying the keyword-based custom
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// filters, not the status-based custom filters.
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// https://docs.joinmastodon.org/entities/FilterResult/
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results.push({
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filter: cachedFilter.filter,
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keyword_matches,
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status_matches: null
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});
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}
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}, []);
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// Send the payload + the FilterResults as the `filtered` property
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// to the streaming connection. To reach this code, the `event` must
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// have been either `update` or `status.update`, meaning the
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// `payload` is a Status entity, which has a `filtered` property:
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//
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// filtered: https://docs.joinmastodon.org/entities/Status/#filtered
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transmit(event, {
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...payload,
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filtered: filter_results
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});
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} else {
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transmit(payload);
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transmit(event, payload);
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}
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}).catch(err => {
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releasePgConnection();
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log.error(err);
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done();
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});
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});
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};
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