Press n or j to go to the next uncovered block, b, p or k for the previous block.
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1x 1x 97266x 97266x 97266x 54x 54x 54x 54x 97266x 97266x 134x 134x 134x 97266x 97266x 97266x 97266x 97266x 97260x 97260x 97266x 97266x 97266x 8x 8x 97258x 97258x 97266x 97266x 97266x 97266x 97256x 97256x 97256x 97256x 97256x 2x 2x 97254x 97254x 97254x 97254x 97254x 97254x 97254x 97256x 97250x 97250x 97250x 97250x 97250x 97250x 97250x 97250x 97256x 97266x 97266x 97266x 94014x 94014x 3244x 97266x 3190x 3190x 54x 54x 54x 54x 54x 54x 2x 2x 4x 2x 2x 2x 4x 2x 2x 2x 2x 54x 54x 54x 97266x 1x 1x 1x | 'use strict';
const { Writable, PassThrough, pipeline } = require('stream');
const { EventEmitter } = require('events');
const { Client, types } = require('pg');
const QueryStream = require('pg-query-stream');
const { queue, asyncify } = require('async');
const iferr = require('iferr');
const { Qlobber, QlobberDedup } = require('qlobber');
const escape = require('pg-escape');
const global_lock = -1;
/* global BigInt */
const minus_one_n = BigInt(-1); // eslint and documentation fail on -1n
types.setTypeParser(20 /* int8, bigserial */, BigInt);
// Note: Publish labels are restricted to A-Za-z0-9_
// Subscription labels are restricted to A-Za-z0-9_*#
class CollectStream extends Writable {
constructor() {
super({ autoDestroy: true });
this._chunks = [];
this._len = 0;
this.on('finish', () => {
this.emit('buffer', Buffer.concat(this._chunks, this._len));
});
}
_write(chunk, encdoding, cb) {
this._chunks.push(chunk);
this._len += chunk.length;
cb();
}
}
/**
* Creates a new `QlobberPG` object for publishing and subscribing to a
* PostgreSQL queue.
*
* @param {Object} options - Configures the PostgreSQL queue.
* @param {String} options.name - Unique identifier for this `QlobberPG`
* instance. Every instance connected to the queue at the same time
* must have a different name.
* @param {Object} options.db - [`node-postgres` configuration](https://node-postgres.com/api/client)
* used for communicating with PostgreSQL.
* @param {Integer} [options.single_ttl=1h] - Default time-to-live
* (in milliseconds) for messages which should be read by at most one
* subscriber. This value is added to the current time and the resulting
* expiry time is put into the message's database row. After the expiry
* time, the message is ignored and deleted when convenient.
* @param {Integer} [options.multi_ttl=1m] - Default time-to-live
* (in milliseconds) for messages which can be read by many subscribers.
* This value is added to the current time and the resulting expiry time is
* put into the message's database row. After the expiry time, the message
* is ignored and deleted when convenient.
* @param {Integer} [options.expire_interval=10s] - Number of milliseconds
* between deleting expired messages from the database.
* @param {Integer} [options.poll_interval=1s] - Number of milliseconds between
* checking the database for new messages.
* @param {Boolean} [options.notify=true] - Whether to use a database trigger
* to watch for new messages. Note that this will be done in addition to
* polling the database every `poll_interval` milliseconds.
* @param {Integer} [options.message_concurrency=1] - The number of messages
* to process at once.
* @param {Integer} [options.handler_concurrency=0] - By default (0), a message
* is considered handled by a subscriber only when all its data has been
* read. If you set `handler_concurrency` to non-zero, a message is
* considered handled as soon as a subscriber receives it. The next message
* will then be processed straight away. The value of `handler_concurrency`
* limits the number of messages being handled by subscribers at any one
* time.
* @param {Boolean} [options.order_by_expiry=false] - Pass messages to
* subscribers in order of their expiry time.
* @param {Boolean} [options.dedup=true] - Whether to ensure each handler
* function is called at most once when a message is received.
* @param {Boolean} [options.single=true] - Whether to process messages meant
* for _at most_ one subscriber (across all `QlobberPG` instances), i.e.
* work queues.
* @param {String} [options.separator='.'] - The character to use for separating
* words in message topics.
* @param {String} [options.wildcard_one='*'] - The character to use for
* matching exactly one word in a message topic to a subscriber.
* @param {String} [options.wildcard_some='#'] - The character to use for
* matching zero or more words in a message topic to a subscriber.
* @param {Function | Array<Function>} [options.filter] - Function called before each message is processed.
* - The function signature is: `(info, handlers, cb(err, ready, filtered_handlers))`
* - You can use this to filter the subscribed handler functions to be called
* for the message (by passing the filtered list as the third argument to
* `cb`).
* - If you want to ignore the message _at this time_ then pass `false` as the
* second argument to `cb`. `options.filter` will be called again later with
* the same message.
* - Defaults to a function which calls `cb(null, true, handlers)`.
* - `handlers` is an ES6 Set, or array if `options.dedup` is falsey.
* - `filtered_handlers` should be an ES6 Set, or array if `options.dedup`
* is falsey. If not, `new Set(filtered_handlers)` or
* `Array.from(filtered_handlers)` will be used to convert it.
* - You can supply an array of filter functions - each will be called in turn
* with the `filtered_handlers` from the previous one.
* - An array containing the filter functions is also available as the `filters`
* property of the `QlobberPG` object and can be modified at any time.
* @param {Integer} [options.batch_size=100] - Passed to https://github.com/brianc/node-pg-query-stream[`node-pg-query-stream`]
* and specifies how many messages to retrieve from the database at a time
* (using a cursor).
*/
class QlobberPG extends EventEmitter {
constructor(options) {
super();
options = options || {};
this._name = options.name;
this._db = options.db;
this._single_ttl = options.single_ttl || (60 * 60 * 1000); // 1h
this._multi_ttl = options.multi_ttl || (60 * 1000); // 1m
this._expire_interval = options.expire_interval || (10 * 1000); // 10s
this._check_interval = options.poll_interval || (1 * 1000); // 1s
this._notify = options.notify == undefined ? true : options.notify;
this._do_dedup = options.dedup === undefined ? true : options.dedup;
this._do_single = options.single === undefined ? true : options.single;
this._order_by_expiry = options.order_by_expiry;
this._batch_size = options.batch_size || 100;
this._topics = new Map();
this._deferred = new Set();
this.filters = options.filter || [];
if (typeof this.filters[Symbol.iterator] !== 'function') {
this.filters = [this.filters];
}
this._matcher_options = Object.assign({
cache_adds: this._topics
}, options);
if (this._do_dedup) {
this._matcher = new QlobberDedup(this._matcher_options);
} else {
this._matcher = new Qlobber(this._matcher_options);
}
this._matcher_marker = {};
this._queue = queue((task, cb) => task(cb));
this._message_queue = queue((task, cb) => {
setImmediate(task.cb);
this._handle_message(task.payload, cb);
}, options.message_concurrency || 1);
if (options.handler_concurrency) {
this._handler_queue = queue((task, cb) => {
setImmediate(task.cb);
this._call_handlers2(task.handlers, task.info, cb);
}, options.handler_concurrency);
}
this.stopped = false;
this.active = true;
this.initialized = false;
const emit_error = err => {
if (err) {
this.stopped = true;
/**
* Error event. Emitted if an unrecoverable error occurs.
* QlobberPG may stop querying the database for messages.
*
* @event error
* @memberof QlobberPG
* @type {Object}
*/
this.emit('error', err);
}
};
const close_and_emit_error = err => {
if (err) {
this.stopped = true;
this._client.end(() => this.emit('error', err));
}
};
this._client = new Client(this._db);
this._client.on('error', this.emit.bind(this, 'error'));
if (this._notify !== false) {
this._client.on('notification', () => {
if (this._chkstop()) {
return;
}
this._check_now();
});
}
this._queue.push(cb => {
if (this._chkstop()) {
return cb();
}
this._client.connect(cb);
}, emit_error);
this._queue.push(asyncify(async () => {
if (this._chkstop()) {
return;
}
await this._client.query('SELECT pg_advisory_lock($1)', [
global_lock
]);
try {
await this._client.query(escape('DROP TRIGGER IF EXISTS %I ON messages', this._name));
} finally {
await this._client.query('SELECT pg_advisory_unlock($1)', [
global_lock
]);
}
}), close_and_emit_error);
this._reset_last_ids(close_and_emit_error);
this._queue.push(cb => {
if (this._chkstop()) {
return cb();
}
this._client.query(escape('LISTEN new_message_%I', this._name), cb);
}, close_and_emit_error);
this._queue.push(cb => {
if (this._chkstop()) {
return cb();
}
this._expire();
this._check();
/**
* Start event. Emitted when messages can be published and
* subscribed to.
*
* @event start
* @memberof QlobberPG
*/
this.initialized = true;
this.emit('start');
cb();
});
}
_reset_last_ids(cb) {
this._queue.push(cb => {
if (this._chkstop()) {
return cb();
}
this._client.query('SELECT DISTINCT ON (publisher) publisher, id FROM messages ORDER BY publisher, id DESC', cb);
}, iferr(cb, r => {
if (this._chkstop()) {
return cb();
}
this._last_ids = new Map();
for (let row of r.rows) {
this._last_ids.set(row.publisher, row.id);
}
cb();
}));
}
_chkstop() {
if (this.stopped && this.active) {
this.active = false;
/**
* Stop event. Emitted after {@link QlobberPG#stop} has been called
* and access to the database has stopped.
*
* @event stop
* @memberof QlobberPG
*/
this.emit('stop');
}
return this.stopped;
}
_warning(err) {
/**
* Warning event. Emitted if a recoverable error occurs.
* QlobberPG will continue to query the database for messages.
*
* If you don't handle this event, the error will be written to
* `console.error`.
*
* @event warning
* @memberof QlobberPG
* @type {Object}
*/
if (err && !this.emit('warning', err)) {
console.error(err); // eslint-disable-line no-console
}
return err;
}
_check_now() {
if (this._check_timeout) {
clearTimeout(this._check_timeout);
delete this._check_timeout;
this._check();
} else {
this._check_delay = 0;
}
}
/**
* Check the database for new messages now rather than waiting for the next
* periodic check to occur.
*/
refresh_now() {
if (this._expire_timeout) {
clearTimeout(this._expire_timeout);
delete this._expire_timeout;
this._expire();
} else {
this._expire_delay = 0;
}
this._check_now();
}
/**
* Same as {@link QlobberPG#refresh_now}.
*/
force_refresh() { // qlobber-fsq compatibility
this.refresh_now();
}
_expire() {
delete this._expire_timeout;
this._expire_delay = this._expire_interval;
this._queue.push(cb => {
if (this._chkstop()) {
return cb();
}
this._client.query('DELETE FROM messages WHERE expires <= NOW()', cb);
}, err => {
if (this._chkstop()) {
return;
}
this._warning(err);
this._expire_timeout = setTimeout(this._expire.bind(this), this._expire_delay);
});
}
_check() {
delete this._check_timeout;
this._check_delay = this._check_interval;
this._queue.push(cb => {
if (this._chkstop()) {
return cb();
}
const test = this._topics_test(true);
if (!test) {
const passthru = new PassThrough();
passthru.end();
return cb(null, passthru);
}
//console.log("QUERYING", this._name, test);
cb(null, this._client.query(new QueryStream(`SELECT * FROM messages AS NEW WHERE (${test}) ORDER BY ${this._order_by_expiry ? 'expires' : 'id'}`, [], {
batchSize: this._batch_size
})));
}, (err, stream) => {
if (this._chkstop()) {
return;
}
if (err) {
return this.emit('error', err);
}
const deferred = this._deferred;
this._deferred = new Set();
const extra_matcher = this._extra_matcher;
delete this._extra_matcher;
//console.log("LAST_IDS BEFORE", this._name, this._last_ids);
let last_ids = new Map();
let ended = false;
const end = err => {
this._client.removeListener('end', end);
if (this._chkstop() || ended) {
return;
}
ended = true;
if (err) {
return this.emit('error', err);
}
//console.log("LAST_IDS UPDATE", this._name, last_ids);
for (let [publisher, id] of last_ids) {
this._last_ids.set(publisher, id);
}
//console.log("LAST_IDS AFTER", this._name, this._last_ids);
this._check_timeout = setTimeout(this._check.bind(this), this._check_delay);
};
this._client.on('end', end);
pipeline(stream, new Writable({
objectMode: true,
write: (msg, encoding, cb) => {
//console.log("GOTMSG", this._name, msg);
let last_id = this._last_ids.get(msg.publisher);
if (last_id === undefined) {
last_id = minus_one_n;
}
if (msg.id > last_id) {
last_ids.set(msg.publisher, msg.id);
}
this._message(msg, deferred, extra_matcher, cb);
}
}), end);
});
}
_filter(info, handlers, cb) {
const next = i => {
return (err, ready, handlers) => {
if (handlers) {
if (this._do_dedup) {
if (!(handlers instanceof Set)) {
handlers = new Set(handlers);
}
} else if (!Array.isArray(handlers)) {
handlers = Array.from(handlers);
}
}
if (err || !ready || (i === this.filters.length)) {
return cb(err, ready, handlers);
}
this.filters[i].call(this, info, handlers, next(i + 1));
};
};
next(0)(null, true, handlers);
}
_num_handlers(handlers) {
return this._do_dedup ? handlers.size : handlers.length;
}
_copy(handlers) {
return this._do_dedup ? new Set(handlers) : Array.from(handlers);
}
_call_handlers2(handlers, info, cb) {
let called = false;
let done_err = null;
let waiting = [];
const len = this._num_handlers(handlers);
const done = err => {
this._warning(err);
const was_waiting = waiting;
waiting = [];
if (was_waiting.length > 0) {
process.nextTick(() => {
for (let f of was_waiting) {
f(err);
}
});
}
const was_called = called;
called = true;
done_err = err;
if (!was_called && !this._chkstop()) {
cb();
}
};
const wait_for_done = (err, cb) => {
this._warning(err);
if (cb) {
if (called) {
cb(done_err);
} else {
waiting.push(cb);
}
}
};
wait_for_done.num_handlers = len;
const deliver_message = lock_client => {
info.expires = info.expires.getTime();
info.size = info.data.length;
let stream;
let destroyed = false;
let delivered_stream = false;
const common_callback = (err, cb) => {
if (destroyed) {
this._warning(err);
return err => wait_for_done(err, cb);
}
destroyed = true;
if (stream) {
stream.destroy(err);
} else {
this._warning(err);
}
return err => {
if (cb) {
process.nextTick(cb, err);
}
// From Node 10, 'readable' is not emitted after destroyed.
// From Node 16, 'end' isn't emitted either.
// However, we have code which relies on the stream ending
// so fix this up by emitting 'end' here.
if (stream) {
stream.emit('end');
}
done(err);
};
};
const multi_callback = (err, cb) => {
common_callback(err, cb)();
};
const single_callback = (err, cb) => {
const cb2 = common_callback(err, cb);
if (!lock_client) {
return cb2();
}
const lc = lock_client;
lock_client = null;
if (err) {
return lc.end(cb2);
}
lc.query('DELETE FROM messages WHERE id = $1', [
info.id
], err => lc.end(err2 => cb2(err || err2)));
};
const hcb = info.single ? single_callback : multi_callback;
hcb.num_handlers = len;
const ensure_stream = () => {
if (stream) {
return stream;
}
stream = new PassThrough();
stream.end(info.data);
stream.setMaxListeners(0);
const sdone = () => {
if (destroyed) {
return;
}
destroyed = true;
stream.destroy();
done();
};
stream.once('end', sdone);
stream.on('error', err => {
this._warning(err);
sdone();
});
return stream;
};
for (let handler of handlers) {
if (handler.accept_stream) {
handler.call(this, ensure_stream(), info, hcb);
delivered_stream = true;
} else {
handler.call(this, info.data, info, hcb);
}
}
if (!delivered_stream && !info.single) {
done();
}
};
if ((len === 0) || this._chkstop()) {
return done();
}
if (!info.single) {
return deliver_message();
}
const lock = async lock_client => {
let r = await lock_client.query('SELECT pg_try_advisory_lock($1)', [
info.id
]);
if (!r.rows[0].pg_try_advisory_lock || this._chkstop()) {
return false;
}
r = await lock_client.query('SELECT EXISTS(SELECT 1 FROM messages WHERE (id = $1 AND (expires > NOW())))', [
info.id
]);
if (!r.rows[0].exists || this._chkstop()) {
return false;
}
return true;
};
(async () => {
const lock_client = new Client(this._db);
try {
await lock_client.connect();
} catch (ex) {
return done(ex);
}
let deliver;
try {
deliver = await lock(lock_client);
} catch (ex) {
await lock_client.end();
return done(ex);
}
if (!deliver) {
await lock_client.end();
return done();
}
deliver_message(lock_client);
})();
}
_call_handlers(handlers, info, cb) {
if (this._handler_queue) {
return this._handler_queue.push({ handlers, info, cb });
}
this._call_handlers2(handlers, info, cb);
}
_handle_message(payload, cb) {
const handlers = this._copy(payload.has_extra_handlers ?
payload.extra_handlers : this._matcher.match(payload.topic));
this._filter(payload, handlers, (err, ready, handlers) => {
this._warning(err);
if (!ready) {
this._deferred.add(payload.id);
if (payload.has_extra_handlers) {
// Remember handlers for existing messages
const em = this._ensure_extra_matcher();
em._extra_handlers.set(payload.id, payload.extra_handlers);
em._matcher_markers.set(payload.id, payload.matcher_marker);
}
return cb();
}
if (payload.single) {
if (this._do_dedup) {
if (handlers.size > 0) {
handlers = new Set([handlers.values().next().value]);
}
} else if (handlers.length > 0) {
handlers = [handlers[0]];
}
}
if (this._num_handlers(handlers) === 0) {
return cb();
}
this._call_handlers(handlers, payload, cb);
});
}
_set_extra(payload, extra_matcher, prev_extra_handlers) {
let extra_handlers = extra_matcher.match(payload.topic);
let has_extra_handlers = this._num_handlers(extra_handlers) > 0;
if (prev_extra_handlers) {
// We had handlers to receive this as an existing message
if ((extra_matcher._matcher_markers.get(payload.id) ===
this._matcher_marker) &&
!has_extra_handlers) {
// No unsubscribe happened and no new handlers
extra_handlers = prev_extra_handlers;
has_extra_handlers = true;
} else {
// Add previous handlers to new ones
extra_handlers = this._copy(extra_handlers);
const handlers = this._matcher.match(payload.topic);
for (let h of prev_extra_handlers) {
if (this._do_dedup) {
if (handlers.has(h)) {
extra_handlers.add(h);
}
} else if (handlers.indexOf(h) >= 0) {
extra_handlers.push(h);
}
}
has_extra_handlers = this._num_handlers(extra_handlers) > 0;
}
extra_matcher._extra_handlers.delete(payload.id);
extra_matcher._matcher_markers.delete(payload.id);
} else {
extra_handlers = this._copy(extra_handlers);
}
// We'll call handlers for existing message
payload.extra_handlers = extra_handlers;
payload.has_extra_handlers = has_extra_handlers;
// If any message is delayed by filter, remember marker so we know if
// any unsubscribe happened
payload.matcher_marker = this._matcher_marker;
}
_message(payload, deferred, extra_matcher, cb) {
payload.topic = payload.topic.split('.').join(this._matcher._separator);
if (payload.expires <= Date.now()) {
return cb();
}
let last_id = this._last_ids.get(payload.publisher);
if (last_id === undefined) {
last_id = minus_one_n;
}
if (payload.id <= last_id) {
payload.existing = true;
}
const is_deferred = deferred.has(payload.id);
if (payload.existing && extra_matcher && !payload.single) {
const prev_extra_handlers =
extra_matcher._extra_handlers.get(payload.id);
if (prev_extra_handlers || !is_deferred) {
this._set_extra(payload, extra_matcher, prev_extra_handlers);
if (!payload.has_extra_handlers) {
return cb();
}
}
} else if (!is_deferred) {
if (payload.existing) {
if (!payload.single || !this._do_single) {
return cb();
}
} else if (payload.single && !this._do_single) {
return cb();
}
}
this._message_queue.push({ payload, cb });
}
/**
* Stop checking for new messages.
*
* @param {Function} [cb] - Optional function to call once access to the
* database has stopped. Alternatively, you can listen for the
* {@link QlobberPG#stop} event.
*/
stop(cb) {
cb = cb || (err => {
if (err) {
this.emit('error', err);
}
});
if (this.stopped) {
return cb.call(this);
}
this.stopped = true;
this._client.end(err => {
this._warning(err);
if (this._expire_timeout && this._check_timeout) {
setImmediate(this._chkstop.bind(this));
}
if (this._expire_timeout) {
clearTimeout(this._expire_timeout);
delete this._expire_timeout;
}
if (this._check_timeout) {
clearTimeout(this._check_timeout);
delete this._check_timeout;
}
if (this.active) {
return this.once('stop', cb.bind(this, err));
}
cb.call(this, err);
});
}
/**
* Same as {@link QlobberPG#stop}.
*/
stop_watching(cb) { // qlobber-fsq compatibility
this.stop(cb);
}
_ltreeify(topic) {
const t = topic.split(this._matcher._separator);
const r = [];
let asterisks = 0;
for (let i = 0; i < t.length; ++i) {
const l = t[i];
switch (l) {
case this._matcher._wildcard_one:
++asterisks;
if (t[i+1] !== this._matcher._wildcard_one) {
r.push(`*{${asterisks}}`);
asterisks = 0;
}
break;
case this._matcher._wildcard_some:
if (t[i+1] !== this._matcher._wildcard_some) {
r.push('*');
}
break;
default:
r.push(l);
break;
}
}
return r.join('.');
}
_or_topics(topics) {
return `(${Array.from(topics.keys()).map(t => {
if (t === '') {
return "(NEW.topic = '')";
}
return escape('(NEW.topic ~ %L)', this._ltreeify(t));
}).join(' OR ')})`;
}
_maybe_or(s, t) {
return s ? `(${s} OR ${t})` : t;
}
_topics_test(check) {
const topics = this._topics;
const extra_topics = this._extra_matcher &&
this._extra_matcher._extra_topics;
if ((topics.size === 0) &&
(!check || ((this._deferred.size === 0) &&
(!extra_topics || extra_topics.size === 0)))) {
return null;
}
let r = '';
if (topics.size > 0) {
r = this._or_topics(topics);
if (check) {
const last_ids = Array.from(this._last_ids);
if (last_ids.length > 0) {
r = `(${r} AND (${last_ids.map(([publisher, id]) => escape('((NEW.publisher = %L) AND (NEW.id > %s))', publisher, id)).join(' OR ')} OR (${last_ids.map(([publisher]) => escape('(NEW.publisher != %L)', publisher)).join(' AND ')}) OR NEW.single))`;
}
}
}
if (check && (this._deferred.size > 0)) {
r = this._maybe_or(r, `(${Array.from(this._deferred).map(id => escape('(NEW.id = %L)', String(id))).join(' OR ')})`);
}
if (check && extra_topics && (extra_topics.size > 0)) {
r = this._maybe_or(r, this._or_topics(extra_topics));
}
return `(${r} AND (NEW.expires > NOW()))`;
}
_update_trigger(cb) {
if (!this._notify) {
return cb();
}
this._queue.push(asyncify(async () => {
if (this._chkstop()) {
throw new Error('stopped');
}
await this._client.query('SELECT pg_advisory_lock($1)', [
global_lock
]);
try {
await this._client.query(escape('DROP TRIGGER IF EXISTS %I ON messages', this._name));
const test = this._topics_test(false);
if (test) {
await this._client.query(escape(`CREATE TRIGGER %I AFTER INSERT ON messages FOR EACH ROW WHEN ${test} EXECUTE PROCEDURE new_message(%I)`, this._name, this._name));
}
} finally {
await this._client.query('SELECT pg_advisory_unlock($1)', [
global_lock
]);
}
}), cb);
}
_valid_topic_length(topic, cb) {
if (topic.length > 255) {
cb(new Error(`topic too long: ${topic}`));
return false;
}
return true;
}
_valid_stopic(topic, cb) {
if (!this._valid_topic_length(topic, cb)) {
return false;
}
if (topic === '') {
return true;
}
for (let label of topic.split(this._matcher._separator)) {
if ((label !== this._matcher._wildcard_one) &&
(label !== this._matcher._wildcard_some) &&
!/^[A-Za-z0-9_]+$/.test(label)) {
cb(new Error(`invalid subscription topic: ${topic}`));
return false;
}
}
return true;
}
_valid_ptopic(topic, cb) {
if (!this._valid_topic_length(topic, cb)) {
return false;
}
if (topic === '') {
return true;
}
for (let label of topic.split(this._matcher._separator)) {
if (!/^[A-Za-z0-9_]+$/.test(label)) {
cb(new Error(`invalid publication topic: ${topic}`));
return false;
}
}
return true;
}
_ensure_extra_matcher() {
if (!this._extra_matcher) {
const extra_topics = new Map();
const matcher_options = Object.assign(this._matcher_options, {
cache_adds: extra_topics
});
if (this._do_dedup) {
this._extra_matcher = new QlobberDedup(matcher_options);
} else {
this._extra_matcher = new Qlobber(matcher_options);
}
this._extra_matcher._extra_topics = extra_topics;
this._extra_matcher._extra_handlers = new Map();
this._extra_matcher._matcher_markers = new Map();
}
return this._extra_matcher;
}
/**
* Subscribe to messages in the PostgreSQL queue.
*
* @param {String} topic - Which messages you're interested in receiving.
* Message topics are split into words using `.` as the separator. You can
* use `*` to match exactly one word in a topic or `#` to match zero or more
* words. For example, `foo.*` would match `foo.bar` whereas `foo.#` would
* match `foo`, `foo.bar` and `foo.bar.wup`. Note you can change the
* separator and wildcard characters by specifying the `separator`,
* `wildcard_one` and `wildcard_some` options when
* {@link QlobberPG|constructing} `QlobberPG` objects. See the [`qlobber`
* documentation](https://github.com/davedoesdev/qlobber#qlobberoptions)
* for more information. Valid characters in `topic` are: `A-Za-z0-9_*#.`
* @param {Function} handler - Function to call when a new message is
* received on the PostgreSQL queue and its topic matches against `topic`.
* `handler` will be passed the following arguments:
* - **`data`** ([`Readable`](http://nodejs.org/api/stream.html#stream_class_stream_readable) | [`Buffer`](http://nodejs.org/api/buffer.html#buffer_class_buffer))
* Message payload as a Readable stream or a Buffer.
* By default you'll receive a Buffer. If `handler` has a property
* `accept_stream` set to a truthy value then you'll receive a stream.
* Note that _all_ subscribers will receive the same stream or content for
* each message. You should take this into account when reading from the
* stream. The stream can be piped into multiple
* [Writable](http://nodejs.org/api/stream.html#stream_class_stream_writable)
* streams but bear in mind it will go at the rate of the slowest one.
* - **`info`** (`Object`) Metadata for the message, with the following
* properties:
* - **`topic`** (`String`) Topic the message was published with.
* - **`expires`** (`Integer`) When the message expires (number of
* milliseconds after January 1970 00:00:00 UTC).
* - **`single`** (`Boolean`) Whether this message is being given to at
* most one subscriber (across all `QlobberPG` instances).
* - **`size`** (`Integer`) Message size in bytes.
* - **`publisher`** (`String`) Name of the `QlobberPG` instance which
* published the message.
* - **`done`** (`Function`) Function to call one you've handled the
* message. Note that calling this function is only mandatory if
* `info.single === true`, in order to delete and unlock the message
* row in the database table. `done` takes two arguments:
* - **`err`** (`Object`) If an error occurred then pass details of the
* error, otherwise pass `null` or `undefined`.
* - **`finish`** (`Function`) Optional function to call once the message
* has been deleted and unlocked, in the case of
* `info.single === true`, or straight away otherwise. It will be
* passed the following argument:
* - **`err`** (`Object`) If an error occurred then details of the
* error, otherwise `null`.
*
* @param {Object} [options] - Optional settings for this subscription.
* @param {Boolean} [options.subscribe_to_existing=false] - If `true` then
* `handler` will be called with any existing, unexpired messages that
* match `topic`, as well as new ones. If `false` (the default) then
* `handler` will be called with new messages only.
*
* @param {Function} [cb] - Optional function to call once the subscription
* has been registered. This will be passed the following argument:
* - **`err`** (`Object`) If an error occurred then details of the error,
* otherwise `null`.
*/
subscribe(topic, handler, options, cb) {
if (typeof options === 'function') {
cb = options;
options = undefined;
}
//console.log("SUBSCRIBE", this._name, topic);
options = options || {};
const cb2 = (err, ...args) => {
this._warning(err);
if (cb) {
cb.call(this, err, ...args);
}
};
if (!this._valid_stopic(topic, cb2)) {
return;
}
this._matcher.add(topic, handler);
if (options.subscribe_to_existing) {
this._ensure_extra_matcher().add(topic, handler);
}
this._update_trigger(cb2);
}
/**
* Unsubscribe from messages in the PostgreSQL queue.
*
* @param {String} [topic] - Which messages you're no longer interested in
* receiving via the `handler` function. This should be a topic you've
* previously passed to {@link QlobberPG#subscribe}. If `topic` is
* `undefined` then all handlers for all topics are unsubscribed.
*
* @param {Function} [handler] - The function you no longer want to be
* called with messages published to the topic `topic`. This should be a
* function you've previously passed to {@link QlobberPG#subscribe}.
* If you subscribed `handler` to a different topic then it will still
* be called for messages which match that topic. If `handler` is
* `undefined`, all handlers for the topic `topic` are unsubscribed.
*
* @param {Function} [cb] - Optional function to call once `handler` has
* been unsubscribed from `topic`. This will be passed the following
* argument:
* - **`err`** (`Object`) If an error occurred then details of the error,
* otherwise `null`.
*/
unsubscribe(topic, handler, cb) {
//console.log("UNSUB", topic, handler, cb);
if (typeof topic === 'function') {
cb = topic;
topic = undefined;
handler = undefined;
}
const cb2 = (err, ...args) => {
this._warning(err);
if (cb) {
cb.call(this, err, ...args);
}
};
if (topic === undefined) {
this._matcher.clear();
if (this._extra_matcher) {
this._extra_matcher.clear();
}
} else {
if (!this._valid_stopic(topic, cb2)) {
return;
}
if (handler === undefined) {
this._matcher.remove(topic);
if (this._extra_matcher) {
this._extra_matcher.remove(topic);
}
} else {
this._matcher.remove(topic, handler);
if (this._extra_matcher) {
this._extra_matcher.remove(topic, handler);
}
}
}
this._matcher_marker = {};
this._update_trigger(cb2);
}
/**
* Publish a message to the PostgreSQL queue.
*
* @param {String} topic - Message topic. The topic should be a series of
* words separated by `.` (or the `separator` character you passed to
* the {@link QlobberPG|constructor}). Valid characters in `topic` are:
* `A-Za-z0-9_.`
*
* @param {String|Buffer} payload - Message payload. If you don't pass a
* payload then `publish` will return a [`Writable`](http://nodejs.org/api/stream.html#stream_class_stream_writable)
* for you to write the payload info.
*
* @param {Object} options - Optional settings for this publication.
* @param {Boolean} [options.single=false] - If `true` then the message
* will be given to _at most_ one interested subscriber, across all
* `QlobberPG` instances querying the PostgreSQL queue. Otherwise all
* interested subscribers will receive the message (the default).
* @param {Integer} [options.ttl] - Time-to-live (in milliseconds) for this
* message. If you don't specify anything then `single_ttl` or
* `multi_ttl` (provided to the {@link QlobberPG|constructor}) will be
* used, depending on the value of `single`. After the time-to-live
* for the message has passed, the message is ignored and deleted when
* convenient.
* @param {String} [options.encoding="utf8"] - If `payload` is a string,
* the encoding to use when writing to the database.
*
* @param {Function} [cb] - Optional function to call once the message has
* been written to the database. It will be passed the following
* arguments:
* - **`err`** (`Object`) If an error occurred then details of the error,
* otherwise `null`.
* - **`info`** (`Object`) Metadata for the message. See
* {@link QlobberPG#subscribe} for a description of `info`'s properties.
*
* @return {Stream|undefined} - A [`Writable`](http://nodejs.org/api/stream.html#stream_class_stream_writable)
* if no `payload` was passed, otherwise `undefined`.
*/
publish(topic, payload, options, cb) {
if ((typeof payload !== 'string') &&
!Buffer.isBuffer(payload) &&
(payload !== undefined)) {
cb = options;
options = payload;
payload = undefined;
}
if (typeof options === 'function') {
cb = options;
options = undefined;
}
options = options || {};
const cb2 = (err, ...args) => {
this._warning(err);
if (cb) {
cb.call(this, err, ...args);
}
};
if (!this._valid_ptopic(topic, cb2)) {
return;
}
const now = Date.now();
const expires = now + (options.ttl || (options.single ? this._single_ttl : this._multi_ttl));
const single = !!options.single;
const insert = data => {
if (this._chkstop()) {
return cb2(new Error('stopped'));
}
//console.log("PUBLISHING", this._name, topic, single);
// Note: ltree will validate topic (maxlen 255) to A-Za-z0-9_
this._queue.push(cb => {
if (this._chkstop()) {
return cb(new Error('stopped'));
}
this._client.query("INSERT INTO messages(topic, expires, single, data, publisher) VALUES($1, $2, $3, decode($4::text, 'hex'), $5)", [
topic.split(this._matcher._separator).join('.'),
new Date(expires),
single,
data.toString('hex'),
this._name
], cb);
}, iferr(cb2, () => {
//console.log("PUBLISHED", this._name, topic, single);
cb2(null, {
topic,
expires,
single,
size: data.length,
publisher: this._name
});
}));
};
if (Buffer.isBuffer(payload)) {
return insert(payload);
}
if (typeof payload === 'string') {
return insert(Buffer.from(payload, options.encoding || 'utf8'));
}
const s = new CollectStream();
s.once('buffer', insert);
s.once('error', function (err) {
let called = false;
function done() {
if (!called) {
called = true;
cb2(err);
}
}
this.removeListener('buffer', insert);
this.once('close', done);
this.once('finish', done);
this.end();
});
return s;
}
}
exports.QlobberPG = QlobberPG;
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