Intial Commit
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valki
222
nodered/rootfs/data/node_modules/tail/lib/tail.js
generated
vendored
Normal file
222
nodered/rootfs/data/node_modules/tail/lib/tail.js
generated
vendored
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// Generated by CoffeeScript 2.4.1
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var Tail, environment, events, fs,
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boundMethodCheck = function(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new Error('Bound instance method accessed before binding'); } };
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events = require("events");
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fs = require('fs');
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environment = process.env['NODE_ENV'] || 'development';
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Tail = class Tail extends events.EventEmitter {
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readBlock() {
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var block, stream;
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boundMethodCheck(this, Tail);
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if (this.queue.length >= 1) {
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block = this.queue[0];
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if (block.end > block.start) {
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stream = fs.createReadStream(this.filename, {
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start: block.start,
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end: block.end - 1,
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encoding: this.encoding
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});
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stream.on('error', (error) => {
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if (this.logger) {
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this.logger.error(`Tail error: ${error}`);
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}
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return this.emit('error', error);
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});
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stream.on('end', () => {
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var x;
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x = this.queue.shift();
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if (this.queue.length > 0) {
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this.internalDispatcher.emit("next");
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}
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if (this.flushAtEOF && this.buffer.length > 0) {
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this.emit("line", this.buffer);
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return this.buffer = '';
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}
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});
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return stream.on('data', (data) => {
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var chunk, i, len, parts, results;
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if (this.separator === null) {
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return this.emit("line", data);
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} else {
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this.buffer += data;
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parts = this.buffer.split(this.separator);
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this.buffer = parts.pop();
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results = [];
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for (i = 0, len = parts.length; i < len; i++) {
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chunk = parts[i];
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results.push(this.emit("line", chunk));
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}
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return results;
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}
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});
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}
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}
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}
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constructor(filename, options = {}) {
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var err, fromBeginning;
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super(filename, options);
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this.readBlock = this.readBlock.bind(this);
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this.change = this.change.bind(this);
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this.filename = filename;
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({separator: this.separator = /[\r]{0,1}\n/, fsWatchOptions: this.fsWatchOptions = {}, follow: this.follow = true, logger: this.logger, useWatchFile: this.useWatchFile = false, flushAtEOF: this.flushAtEOF = false, encoding: this.encoding = "utf-8", fromBeginning = false} = options);
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if (this.logger) {
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this.logger.info("Tail starting...");
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this.logger.info(`filename: ${this.filename}`);
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this.logger.info(`encoding: ${this.encoding}`);
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try {
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fs.accessSync(this.filename, fs.constants.F_OK);
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} catch (error1) {
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err = error1;
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if (err.code === 'ENOENT') {
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throw err;
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}
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}
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}
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this.buffer = '';
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this.internalDispatcher = new events.EventEmitter();
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this.queue = [];
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this.isWatching = false;
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this.internalDispatcher.on('next', () => {
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return this.readBlock();
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});
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this.watch(fromBeginning);
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}
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change(filename) {
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var err, stats;
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boundMethodCheck(this, Tail);
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try {
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stats = fs.statSync(filename);
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} catch (error1) {
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err = error1;
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if (this.logger) {
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this.logger.error(`change event for ${filename} failed: ${err}`);
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}
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this.emit("error", `change event for ${filename} failed: ${err}`);
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return;
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}
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if (stats.size < this.pos) { //scenario where texts is not appended but it's actually a w+
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this.pos = stats.size;
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}
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if (stats.size > this.pos) {
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this.queue.push({
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start: this.pos,
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end: stats.size
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});
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this.pos = stats.size;
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if (this.queue.length === 1) {
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return this.internalDispatcher.emit("next");
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}
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}
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}
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watch(fromBeginning) {
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var err, stats;
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if (this.isWatching) {
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return;
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}
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if (this.logger) {
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this.logger.info(`filesystem.watch present? ${fs.watch !== void 0}`);
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this.logger.info(`useWatchFile: ${this.useWatchFile}`);
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this.logger.info(`fromBeginning: ${fromBeginning}`);
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}
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this.isWatching = true;
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try {
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stats = fs.statSync(this.filename);
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} catch (error1) {
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err = error1;
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if (this.logger) {
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this.logger.error(`watch for ${this.filename} failed: ${err}`);
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}
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this.emit("error", `watch for ${this.filename} failed: ${err}`);
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return;
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}
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this.pos = fromBeginning ? 0 : stats.size;
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if (this.pos === 0) {
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this.change(this.filename);
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}
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if (!this.useWatchFile && fs.watch) {
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if (this.logger) {
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this.logger.info("watch strategy: watch");
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}
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return this.watcher = fs.watch(this.filename, this.fsWatchOptions, (e, filename) => {
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return this.watchEvent(e, filename);
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});
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} else {
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if (this.logger) {
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this.logger.info("watch strategy: watchFile");
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}
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return fs.watchFile(this.filename, this.fsWatchOptions, (curr, prev) => {
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return this.watchFileEvent(curr, prev);
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});
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}
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}
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rename(filename) {
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//MacOS sometimes throws a rename event for no reason.
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//Different platforms might behave differently.
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//see https://nodejs.org/api/fs.html#fs_fs_watch_filename_options_listener
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//filename might not be present.
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//https://nodejs.org/api/fs.html#fs_filename_argument
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//Better solution would be check inode but it will require a timeout and
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// a sync file read.
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if (filename === void 0 || filename !== this.filename) {
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this.unwatch();
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if (this.follow) {
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return setTimeout((() => {
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return this.watch();
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}), 1000);
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} else {
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if (this.logger) {
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this.logger.error(`'rename' event for ${this.filename}. File not available.`);
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}
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return this.emit("error", `'rename' event for ${this.filename}. File not available.`);
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}
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} else {
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}
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}
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// @logger.info("rename event but same filename")
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watchEvent(e, evtFilename) {
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if (e === 'change') {
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return this.change(this.filename);
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} else if (e === 'rename') {
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return this.rename(evtFilename);
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}
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}
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watchFileEvent(curr, prev) {
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if (curr.size > prev.size) {
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this.pos = curr.size; // Update @pos so that a consumer can determine if entire file has been handled
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this.queue.push({
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start: prev.size,
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end: curr.size
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});
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if (this.queue.length === 1) {
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return this.internalDispatcher.emit("next");
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}
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}
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}
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unwatch() {
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if (this.watcher) {
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this.watcher.close();
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} else {
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fs.unwatchFile(this.filename);
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}
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this.isWatching = false;
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this.queue = [];
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if (this.logger) {
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return this.logger.info("Unwatch ", this.filename);
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}
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}
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};
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exports.Tail = Tail;
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