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94 lines
3.1 KiB
JavaScript
94 lines
3.1 KiB
JavaScript
'use strict';
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const Promise = require("bluebird");
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const bhttp = require("bhttp");
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const promiseTaskQueue = require("promise-task-queue");
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const createEventEmitter = require("create-event-emitter");
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const defaultValue = require("default-value");
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const debug = require("debug")("pastebinStream:scrapers:pastebinCom");
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const promiseSetInterval = require("../promise-set-interval");
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const errors = require("../errors");
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function tryParseBody(body) {
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try {
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return JSON.parse(body);
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} catch (err) {
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throw new errors.HttpError(`Got rate-limited? Error message: ${body}`, {type: "rateLimited"});
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}
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}
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module.exports = function createPastebinComScraper(options = {}) {
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let queue = promiseTaskQueue();
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let knownPastes = [];
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let previousKnownPastes = [];
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queue.define("fetchPaste", (task) => {
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return Promise.try(() => {
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return bhttp.get(`http://pastebin.com/api_scrape_item.php?i=${task.pasteKey}`);
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}).then((response) => {
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if (response.statusCode !== 200) {
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// FIXME: Retry!
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throw new errors.HttpError(`Encountered a non-200 status code for Pastebin.com while retrieving a raw paste: ${response.statusCode}`, {type: "statusCode"});
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} else if (response.body.toString().indexOf("Please slow down, you are hitting our servers unnecessarily hard!") === 0) {
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throw new errors.HttpError("Got rate-limited!", {type: "rateLimited"});
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} else {
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return response.body.toString();
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}
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})
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}, {
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interval: options.pasteInterval
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});
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let loop;
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return createEventEmitter({
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stop: function stopScraper() {
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if (loop != null) {
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this.emit("stopped");
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loop.cancel();
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}
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},
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start: function startScraper() {
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loop = promiseSetInterval(() => {
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return Promise.try(() => {
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return bhttp.get(`http://pastebin.com/api_scraping.php?limit=${defaultValue(options.listLimit, 100)}`, {
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noDecode: true /* Because Pastebin.com errors aren't JSON... */
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});
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}).then((response) => {
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if (response.statusCode !== 200) {
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throw new errors.HttpError(`Encountered a non-200 status code for Pastebin.com while listing the most recent pastes: ${response.statusCode}`, {type: "statusCode"});
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} else {
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return tryParseBody(response.body).reverse();
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}
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}).tap((pastes) => {
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previousKnownPastes = knownPastes;
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knownPastes = pastes.map(paste => paste.key);
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}).filter((paste) => {
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return (!previousKnownPastes.includes(paste.key));
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}).tap((pastes) => {
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debug(`Found ${pastes.length} new pastes`);
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}).each((paste) => {
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/* We *intentionally* do not return the Promise chain below; we don't want to block the interval with queue items. */
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Promise.try(() => {
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return queue.push("fetchPaste", {
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pasteKey: paste.key
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});
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}).then((rawPaste) => {
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this.emit("paste", Object.assign({
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raw: rawPaste
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}, paste));
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}).catch((err) => {
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this.emit("error", err);
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});
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}).catch((err) => {
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/* This is where eg. rate-limiting errors will end up. */
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this.emit("error", err);
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});
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}, defaultValue(options.listInterval, 60) * 1000, {
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startImmediately: true
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});
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}
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});
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};
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