648 lines
22 KiB
JavaScript
648 lines
22 KiB
JavaScript
/*@flow*/
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/* jshint esversion: 6 */
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/* global Buffer */
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var Fs = require("fs");
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var Fse = require("fs-extra");
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var Path = require("path");
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var nThen = require("nthen");
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var Semaphore = require("saferphore");
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const ToPull = require('stream-to-pull-stream');
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const Pull = require('pull-stream');
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const isValidChannelId = function (id) {
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return typeof(id) === 'string' &&
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id.length >= 32 && id.length < 50 &&
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/^[a-zA-Z0-9=+-]*$/.test(id);
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};
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// 511 -> octal 777
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// read, write, execute permissions flag
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const PERMISSIVE = 511;
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var mkPath = function (env, channelId) {
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return Path.join(env.root, channelId.slice(0, 2), channelId) + '.ndjson';
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};
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var mkArchivePath = function (env, channelId) {
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return Path.join(env.archiveRoot, 'datastore', channelId.slice(0, 2), channelId) + '.ndjson';
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};
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var getMetadataAtPath = function (Env, path, cb) {
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var remainder = '';
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var stream = Fs.createReadStream(path, { encoding: 'utf8' });
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var complete = function (err, data) {
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var _cb = cb;
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cb = undefined;
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if (_cb) { _cb(err, data); }
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};
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stream.on('data', function (chunk) {
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if (!/\n/.test(chunk)) {
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remainder += chunk;
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return;
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}
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stream.close();
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var metadata = chunk.split('\n')[0];
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var parsed = null;
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try {
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parsed = JSON.parse(metadata);
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complete(undefined, parsed);
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}
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catch (e) {
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console.log("getMetadataAtPath");
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console.error(e);
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complete('INVALID_METADATA');
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}
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});
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stream.on('end', function () {
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complete();
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});
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stream.on('error', function (e) { complete(e); });
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};
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var getChannelMetadata = function (Env, channelId, cb) {
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var path = mkPath(Env, channelId);
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getMetadataAtPath(Env, path, cb);
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};
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var closeChannel = function (env, channelName, cb) {
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if (!env.channels[channelName]) { return void cb(); }
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try {
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env.channels[channelName].writeStream.close();
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delete env.channels[channelName];
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env.openFiles--;
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cb();
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} catch (err) {
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cb(err);
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}
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};
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var clearChannel = function (env, channelId, cb) {
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var path = mkPath(env, channelId);
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getMetadataAtPath(env, path, function (e, metadata) {
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if (e) { return cb(new Error(e)); }
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if (!metadata) {
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return void Fs.truncate(path, 0, function (err) {
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if (err) {
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return cb(err);
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}
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cb(void 0);
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});
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}
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var len = JSON.stringify(metadata).length + 1;
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// as long as closeChannel is synchronous, this should not cause
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// any race conditions. truncate ought to return faster than a channel
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// can be opened and read by another user. if that turns out not to be
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// the case, we'll need to implement locking.
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closeChannel(env, channelId, function (err) {
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if (err) { cb(err); }
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Fs.truncate(path, len, function (err) {
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if (err) { return cb(err); }
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cb();
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});
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});
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});
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};
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var readMessages = function (path, msgHandler, cb) {
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var remainder = '';
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var stream = Fs.createReadStream(path, { encoding: 'utf8' });
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var complete = function (err) {
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var _cb = cb;
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cb = undefined;
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if (_cb) { _cb(err); }
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};
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stream.on('data', function (chunk) {
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var lines = chunk.split('\n');
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lines[0] = remainder + lines[0];
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remainder = lines.pop();
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lines.forEach(msgHandler);
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});
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stream.on('end', function () {
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msgHandler(remainder);
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complete();
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});
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stream.on('error', function (e) { complete(e); });
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};
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const NEWLINE_CHR = ('\n').charCodeAt(0);
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const mkBufferSplit = () => {
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let remainder = null;
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return Pull((read) => {
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return (abort, cb) => {
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read(abort, function (end, data) {
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if (end) {
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if (data) { console.log("mkBufferSplit() Data at the end"); }
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cb(end, remainder ? [remainder, data] : [data]);
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remainder = null;
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return;
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}
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const queue = [];
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for (;;) {
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const offset = data.indexOf(NEWLINE_CHR);
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if (offset < 0) {
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remainder = remainder ? Buffer.concat([remainder, data]) : data;
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break;
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}
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let subArray = data.slice(0, offset);
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if (remainder) {
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subArray = Buffer.concat([remainder, subArray]);
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remainder = null;
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}
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queue.push(subArray);
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data = data.slice(offset + 1);
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}
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cb(end, queue);
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});
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};
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}, Pull.flatten());
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};
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const mkOffsetCounter = () => {
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let offset = 0;
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return Pull.map((buff) => {
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const out = { offset: offset, buff: buff };
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// +1 for the eaten newline
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offset += buff.length + 1;
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return out;
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});
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};
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const readMessagesBin = (env, id, start, msgHandler, cb) => {
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const stream = Fs.createReadStream(mkPath(env, id), { start: start });
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// TODO get the channel and add the atime
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let keepReading = true;
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Pull(
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ToPull.read(stream),
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mkBufferSplit(),
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mkOffsetCounter(),
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Pull.asyncMap((data, moreCb) => {
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msgHandler(data, moreCb, () => { keepReading = false; moreCb(); });
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}),
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Pull.drain(() => (keepReading), (err) => {
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cb((keepReading) ? err : undefined);
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})
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);
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};
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var checkPath = function (path, callback) {
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// TODO check if we actually need to use stat at all
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Fs.stat(path, function (err) {
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if (!err) {
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callback(undefined, true);
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return;
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}
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if (err.code !== 'ENOENT') {
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callback(err);
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return;
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}
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Fse.mkdirp(Path.dirname(path), PERMISSIVE, function (err) {
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if (err && err.code !== 'EEXIST') {
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callback(err);
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return;
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}
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callback(undefined, false);
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});
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});
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};
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var removeChannel = function (env, channelName, cb) {
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var filename = mkPath(env, channelName);
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Fs.unlink(filename, cb);
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};
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// pass in the path so we can reuse the same function for archived files
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var channelExists = function (filepath, channelName, cb) {
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Fs.stat(filepath, function (err, stat) {
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if (err) {
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if (err.code === 'ENOENT') {
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// no, the file doesn't exist
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return void cb(void 0, false);
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}
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return void cb(err);
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}
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if (!stat.isFile()) { return void cb("E_NOT_FILE"); }
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return void cb(void 0, true);
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});
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};
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var removeArchivedChannel = function (env, channelName, cb) {
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var filename = mkArchivePath(env, channelName);
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Fs.unlink(filename, cb);
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};
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var listChannels = function (root, handler, cb) {
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// do twenty things at a time
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var sema = Semaphore.create(20);
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var dirList = [];
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nThen(function (w) {
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// the root of your datastore contains nested directories...
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Fs.readdir(root, w(function (err, list) {
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if (err) {
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w.abort();
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// TODO check if we normally return strings or errors
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return void cb(err);
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}
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dirList = list;
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}));
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}).nThen(function (w) {
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// search inside the nested directories
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// stream it so you don't put unnecessary data in memory
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var wait = w();
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dirList.forEach(function (dir) {
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sema.take(function (give) {
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var nestedDirPath = Path.join(root, dir);
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Fs.readdir(nestedDirPath, w(give(function (err, list) {
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if (err) { return void handler(err); } // Is this correct?
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list.forEach(function (item) {
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// ignore things that don't match the naming pattern
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if (/^\./.test(item) || !/[0-9a-fA-F]{32,}\.ndjson$/.test(item)) { return; }
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var filepath = Path.join(nestedDirPath, item);
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var channel = filepath.replace(/\.ndjson$/, '').replace(/.*\//, '');
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if ([32, 34].indexOf(channel.length) === -1) { return; }
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// otherwise throw it on the pile
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sema.take(function (give) {
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var next = w(give());
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Fs.stat(filepath, w(function (err, stats) {
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if (err) {
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return void handler(err);
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}
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handler(void 0, {
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channel: channel,
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atime: stats.atime,
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mtime: stats.mtime,
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ctime: stats.ctime,
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size: stats.size,
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}, next);
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}));
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});
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});
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})));
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});
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});
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wait();
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}).nThen(function () {
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cb();
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});
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};
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// move a channel's log file from its current location
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// to an equivalent location in the cold storage directory
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var archiveChannel = function (env, channelName, cb) {
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if (!env.retainData) {
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return void cb("ARCHIVES_DISABLED");
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}
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// ctime is the most reliable indicator of when a file was archived
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// because it is used to indicate changes to the files metadata
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// and not its contents
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// if we find that this is not reliable in production, we can update it manually
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// https://nodejs.org/api/fs.html#fs_fs_utimes_path_atime_mtime_callback
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// check what the channel's path should be (in its current location)
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var currentPath = mkPath(env, channelName);
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// construct a parallel path in the new location
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var archivePath = mkArchivePath(env, channelName);
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// use Fse.move to move it, Fse makes paths to the directory when you use it.
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// https://github.com/jprichardson/node-fs-extra/blob/HEAD/docs/move.md
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Fse.move(currentPath, archivePath, { overwrite: true }, cb);
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};
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var unarchiveChannel = function (env, channelName, cb) {
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// very much like 'archiveChannel' but in the opposite direction
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// the file is currently archived
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var currentPath = mkArchivePath(env, channelName);
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var unarchivedPath = mkPath(env, channelName);
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// if a file exists in the unarchived path, you probably don't want to clobber its data
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// so unlike 'archiveChannel' we won't overwrite.
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// Fse.move will call back with EEXIST in such a situation
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Fse.move(currentPath, unarchivedPath, cb);
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};
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var flushUnusedChannels = function (env, cb, frame) {
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var currentTime = +new Date();
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var expiration = typeof(frame) === 'undefined'? env.channelExpirationMs: frame;
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Object.keys(env.channels).forEach(function (chanId) {
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var chan = env.channels[chanId];
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if (typeof(chan.atime) !== 'number') { return; }
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if (currentTime >= expiration + chan.atime) {
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closeChannel(env, chanId, function (err) {
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if (err) {
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console.error(err);
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return;
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}
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if (env.verbose) {
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console.log("Closed channel [%s]", chanId);
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}
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});
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}
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});
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cb();
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};
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var channelBytes = function (env, chanName, cb) {
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var path = mkPath(env, chanName);
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Fs.stat(path, function (err, stats) {
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if (err) { return void cb(err); }
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cb(undefined, stats.size);
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});
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};
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/*::
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export type ChainPadServer_ChannelInternal_t = {
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atime: number,
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writeStream: typeof(process.stdout),
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whenLoaded: ?Array<(err:?Error, chan:?ChainPadServer_ChannelInternal_t)=>void>,
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onError: Array<(?Error)=>void>,
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path: string
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};
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*/
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var getChannel = function (
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env,
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id,
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callback /*:(err:?Error, chan:?ChainPadServer_ChannelInternal_t)=>void*/
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) {
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if (env.channels[id]) {
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var chan = env.channels[id];
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chan.atime = +new Date();
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if (chan.whenLoaded) {
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chan.whenLoaded.push(callback);
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} else {
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callback(undefined, chan);
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}
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return;
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}
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if (env.openFiles >= env.openFileLimit) {
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// if you're running out of open files, asynchronously clean up expired files
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// do it on a shorter timeframe, though (half of normal)
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setTimeout(function () {
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flushUnusedChannels(env, function () {
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if (env.verbose) {
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console.log("Approaching open file descriptor limit. Cleaning up");
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}
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}, env.channelExpirationMs / 2);
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});
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}
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var path = mkPath(env, id);
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var channel /*:ChainPadServer_ChannelInternal_t*/ = env.channels[id] = {
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atime: +new Date(),
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writeStream: (undefined /*:any*/),
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whenLoaded: [ callback ],
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onError: [ ],
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path: path
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};
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var complete = function (err) {
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var whenLoaded = channel.whenLoaded;
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// no guarantee stream.on('error') will not cause this to be called multiple times
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if (!whenLoaded) { return; }
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channel.whenLoaded = undefined;
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if (err) {
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delete env.channels[id];
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}
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if (!channel.writeStream) {
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throw new Error("getChannel() complete called without channel writeStream");
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}
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whenLoaded.forEach(function (wl) { wl(err, (err) ? undefined : channel); });
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};
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var fileExists;
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var errorState;
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nThen(function (waitFor) {
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checkPath(path, waitFor(function (err, exists) {
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if (err) {
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errorState = true;
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complete(err);
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return;
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}
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fileExists = exists;
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}));
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}).nThen(function (waitFor) {
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if (errorState) { return; }
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var stream = channel.writeStream = Fs.createWriteStream(path, { flags: 'a' });
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env.openFiles++;
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stream.on('open', waitFor());
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stream.on('error', function (err /*:?Error*/) {
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env.openFiles--;
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// this might be called after this nThen block closes.
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if (channel.whenLoaded) {
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complete(err);
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} else {
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channel.onError.forEach(function (handler) {
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handler(err);
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});
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}
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});
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}).nThen(function () {
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if (errorState) { return; }
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complete();
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});
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};
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const messageBin = (env, chanName, msgBin, cb) => {
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getChannel(env, chanName, function (err, chan) {
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if (!chan) {
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cb(err);
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return;
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}
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let called = false;
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var complete = function (err) {
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if (called) { return; }
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called = true;
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cb(err);
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};
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chan.onError.push(complete);
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chan.writeStream.write(msgBin, function () {
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/*::if (!chan) { throw new Error("Flow unreachable"); }*/
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chan.onError.splice(chan.onError.indexOf(complete), 1);
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if (!cb) { return; }
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//chan.messages.push(msg);
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chan.atime = +new Date(); // FIXME seems like odd behaviour that not passing a callback would result in not updating atime...
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complete();
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});
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});
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};
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var message = function (env, chanName, msg, cb) {
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messageBin(env, chanName, new Buffer(msg + '\n', 'utf8'), cb);
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};
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var getMessages = function (env, chanName, handler, cb) {
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getChannel(env, chanName, function (err, chan) {
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if (!chan) {
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cb(err);
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return;
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}
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var errorState = false;
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readMessages(chan.path, function (msg) {
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if (!msg || errorState) { return; }
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//console.log(msg);
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try {
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handler(msg);
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} catch (e) {
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errorState = true;
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return void cb(err);
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}
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}, function (err) {
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if (err) {
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errorState = true;
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return void cb(err);
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}
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if (!chan) { throw new Error("impossible, flow checking"); }
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chan.atime = +new Date();
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cb();
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});
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});
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};
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/*::
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export type ChainPadServer_MessageObj_t = { buff: Buffer, offset: number };
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export type ChainPadServer_Storage_t = {
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readMessagesBin: (
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channelName:string,
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start:number,
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asyncMsgHandler:(msg:ChainPadServer_MessageObj_t, moreCb:()=>void, abortCb:()=>void)=>void,
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cb:(err:?Error)=>void
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)=>void,
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message: (channelName:string, content:string, cb:(err:?Error)=>void)=>void,
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messageBin: (channelName:string, content:Buffer, cb:(err:?Error)=>void)=>void,
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getMessages: (channelName:string, msgHandler:(msg:string)=>void, cb:(err:?Error)=>void)=>void,
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removeChannel: (channelName:string, cb:(err:?Error)=>void)=>void,
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closeChannel: (channelName:string, cb:(err:?Error)=>void)=>void,
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flushUnusedChannels: (cb:()=>void)=>void,
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getChannelSize: (channelName:string, cb:(err:?Error, size:?number)=>void)=>void,
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getChannelMetadata: (channelName:string, cb:(err:?Error|string, data:?any)=>void)=>void,
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clearChannel: (channelName:string, (err:?Error)=>void)=>void
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};
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export type ChainPadServer_Config_t = {
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verbose?: boolean,
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filePath?: string,
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channelExpirationMs?: number,
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openFileLimit?: number
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};
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*/
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module.exports.create = function (
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conf /*:ChainPadServer_Config_t*/,
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cb /*:(store:ChainPadServer_Storage_t)=>void*/
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) {
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var env = {
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root: conf.filePath || './datastore',
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archiveRoot: conf.archivePath || './data/archive',
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retainData: conf.retainData,
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channels: { },
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channelExpirationMs: conf.channelExpirationMs || 30000,
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verbose: conf.verbose,
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openFiles: 0,
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openFileLimit: conf.openFileLimit || 2048,
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};
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var it;
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nThen(function (w) {
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// make sure the store's directory exists
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Fse.mkdirp(env.root, PERMISSIVE, w(function (err) {
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if (err && err.code !== 'EEXIST') {
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throw err;
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}
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}));
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// make sure the cold storage directory exists
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Fse.mkdirp(env.archiveRoot, PERMISSIVE, w(function (err) {
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if (err && err.code !== 'EEXIST') {
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throw err;
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}
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}));
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}).nThen(function () {
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cb({
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readMessagesBin: (channelName, start, asyncMsgHandler, cb) => {
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if (!isValidChannelId(channelName)) { return void cb(new Error('EINVAL')); }
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readMessagesBin(env, channelName, start, asyncMsgHandler, cb);
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},
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message: function (channelName, content, cb) {
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if (!isValidChannelId(channelName)) { return void cb(new Error('EINVAL')); }
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message(env, channelName, content, cb);
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},
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messageBin: (channelName, content, cb) => {
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if (!isValidChannelId(channelName)) { return void cb(new Error('EINVAL')); }
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messageBin(env, channelName, content, cb);
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},
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getMessages: function (channelName, msgHandler, cb) {
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if (!isValidChannelId(channelName)) { return void cb(new Error('EINVAL')); }
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getMessages(env, channelName, msgHandler, cb);
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},
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removeChannel: function (channelName, cb) {
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if (!isValidChannelId(channelName)) { return void cb(new Error('EINVAL')); }
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removeChannel(env, channelName, function (err) {
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cb(err);
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});
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},
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removeArchivedChannel: function (channelName, cb) {
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if (!isValidChannelId(channelName)) { return void cb(new Error('EINVAL')); }
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removeArchivedChannel(env, channelName, cb);
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},
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closeChannel: function (channelName, cb) {
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if (!isValidChannelId(channelName)) { return void cb(new Error('EINVAL')); }
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closeChannel(env, channelName, cb);
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},
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flushUnusedChannels: function (cb) {
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flushUnusedChannels(env, cb);
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},
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getChannelSize: function (channelName, cb) {
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if (!isValidChannelId(channelName)) { return void cb(new Error('EINVAL')); }
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channelBytes(env, channelName, cb);
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},
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getChannelMetadata: function (channelName, cb) {
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if (!isValidChannelId(channelName)) { return void cb(new Error('EINVAL')); }
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getChannelMetadata(env, channelName, cb);
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},
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clearChannel: function (channelName, cb) {
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if (!isValidChannelId(channelName)) { return void cb(new Error('EINVAL')); }
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clearChannel(env, channelName, cb);
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},
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listChannels: function (handler, cb) {
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listChannels(env.root, handler, cb);
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},
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isChannelAvailable: function (channelName, cb) {
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if (!isValidChannelId(channelName)) { return void cb(new Error('EINVAL')); }
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// construct the path
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var filepath = mkPath(env, channelName);
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channelExists(filepath, channelName, cb);
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},
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isChannelArchived: function (channelName, cb) {
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if (!isValidChannelId(channelName)) { return void cb(new Error('EINVAL')); }
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// construct the path
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var filepath = mkArchivePath(env, channelName);
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channelExists(filepath, channelName, cb);
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},
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listArchivedChannels: function (handler, cb) {
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listChannels(Path.join(env.archiveRoot, 'datastore'), handler, cb);
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},
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archiveChannel: function (channelName, cb) {
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if (!isValidChannelId(channelName)) { return void cb(new Error('EINVAL')); }
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archiveChannel(env, channelName, cb);
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},
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restoreArchivedChannel: function (channelName, cb) {
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if (!isValidChannelId(channelName)) { return void cb(new Error('EINVAL')); }
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unarchiveChannel(env, channelName, cb);
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},
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log: function (channelName, content, cb) {
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message(env, channelName, content, cb);
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},
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shutdown: function () {
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clearInterval(it);
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}
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});
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});
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it = setInterval(function () {
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flushUnusedChannels(env, function () { });
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}, 5000);
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};
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