feed-watch
Version:
A highly configurable lightweight module for watching/emitting changes in rss feeds
171 lines • 8.35 kB
JavaScript
;
var __extends = (this && this.__extends) || (function () {
var extendStatics = function (d, b) {
extendStatics = Object.setPrototypeOf ||
({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
function (d, b) { for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p]; };
return extendStatics(d, b);
};
return function (d, b) {
extendStatics(d, b);
function __() { this.constructor = d; }
d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
};
})();
var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
return new (P || (P = Promise))(function (resolve, reject) {
function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); }
step((generator = generator.apply(thisArg, _arguments || [])).next());
});
};
var __generator = (this && this.__generator) || function (thisArg, body) {
var _ = { label: 0, sent: function() { if (t[0] & 1) throw t[1]; return t[1]; }, trys: [], ops: [] }, f, y, t, g;
return g = { next: verb(0), "throw": verb(1), "return": verb(2) }, typeof Symbol === "function" && (g[Symbol.iterator] = function() { return this; }), g;
function verb(n) { return function (v) { return step([n, v]); }; }
function step(op) {
if (f) throw new TypeError("Generator is already executing.");
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if (y = 0, t) op = [op[0] & 2, t.value];
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case 0: case 1: t = op; break;
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}
};
Object.defineProperty(exports, "__esModule", { value: true });
var events_1 = require("events");
var FeedParser_1 = require("./modules/FeedParser");
function defaultUidGenerator(el) {
return el.guid + ":" + el.link + ":" + el.title;
}
var FeedWatch = (function (_super) {
__extends(FeedWatch, _super);
function FeedWatch() {
var _this_1 = _super !== null && _super.apply(this, arguments) || this;
_this_1.feedList = [];
return _this_1;
}
FeedWatch.prototype.fetchAndUpdateItems = function (feed, isInitialRun) {
if (isInitialRun === void 0) { isInitialRun = false; }
return __awaiter(this, void 0, void 0, function () {
var feedItems, err_1;
var _this_1 = this;
return __generator(this, function (_a) {
switch (_a.label) {
case 0:
_a.trys.push([0, 2, , 3]);
return [4, FeedParser_1.get(feed.config.url, feed.config.requestOpts, feed.config.parserOpts)];
case 1:
feedItems = _a.sent();
feedItems.some(function (el) {
var uniqueId = feed.config.uidGenerator(el);
if (feed.lastUid === uniqueId)
return true;
if (isInitialRun && feed.config.skipInitialList)
return false;
_this_1.emit('item', {
feed: {
name: feed.config.name,
url: feed.config.url,
},
item: el,
});
return false;
});
if (feedItems[0]) {
feed.lastUid = feed.config.uidGenerator(feedItems[0]);
}
return [3, 3];
case 2:
err_1 = _a.sent();
err_1.message = feed.config.url + ": " + err_1.message;
this.emit('error', err_1);
return [3, 3];
case 3: return [2];
}
});
});
};
FeedWatch.prototype.initFeed = function (config) {
return __awaiter(this, void 0, void 0, function () {
var feed, _this;
return __generator(this, function (_a) {
switch (_a.label) {
case 0:
feed = {
config: config,
lastUid: null,
};
this.feedList.push(feed);
return [4, this.fetchAndUpdateItems(feed, true)];
case 1:
_a.sent();
_this = this;
feed.timer = setInterval(function () {
_this.fetchAndUpdateItems(feed);
}, config.refreshRateInSecs * 1000);
return [2];
}
});
});
};
FeedWatch.prototype.add = function (_a) {
var name = _a.name, url = _a.url, _b = _a.skipInitialList, skipInitialList = _b === void 0 ? false : _b, _c = _a.refreshRateInSecs, refreshRateInSecs = _c === void 0 ? 300 : _c, _d = _a.uidGenerator, uidGenerator = _d === void 0 ? defaultUidGenerator : _d, _e = _a.requestOpts, requestOpts = _e === void 0 ? {
headers: {
'user-agent': 'FeedWatch/0.1.0',
accept: 'text/html,application/xhtml+xml,application/xml,text/xml',
},
maxRedirects: 5,
} : _e, parserOpts = _a.parserOpts;
var config = {
name: name,
url: url,
skipInitialList: skipInitialList,
refreshRateInSecs: refreshRateInSecs,
uidGenerator: uidGenerator,
requestOpts: requestOpts,
parserOpts: parserOpts,
};
var existingFeed = this.feedList.find(function (el) { return el.config.url === url; });
if (existingFeed)
throw new Error("Feed: " + url + " already subscribed");
this.initFeed(config);
};
FeedWatch.prototype.remove = function (url) {
var feed = this.feedList.find(function (el) { return el.config.url === url; });
if (feed === null || feed === void 0 ? void 0 : feed.timer) {
clearInterval(feed.timer);
}
this.feedList = this.feedList.filter(function (el) { return el.config.url !== url; });
};
FeedWatch.prototype.destroy = function () {
this.feedList.forEach(function (feed) {
if (feed === null || feed === void 0 ? void 0 : feed.timer) {
clearInterval(feed.timer);
}
});
this.feedList = [];
};
FeedWatch.prototype.list = function () {
return this.feedList.map(function (el) { return el.config; });
};
return FeedWatch;
}(events_1.EventEmitter));
exports.default = FeedWatch;
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