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Better way to discover new entries #10

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4d8cdbe
Better way to discover new entries
jumbojett Dec 29, 2015
fc769a2
Changing hash values
jumbojett Dec 29, 2015
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22 changes: 14 additions & 8 deletions src/watcher.coffee
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Original file line number Diff line number Diff line change
Expand Up @@ -8,15 +8,16 @@

{EventEmitter} = require 'events'
parser = require 'parse-rss'
crypto = require('crypto');

class Watcher extends EventEmitter

constructor:(feedUrl)->
throw new Error("arguments error.") if not feedUrl or feedUrl is undefined
@feedUrl = feedUrl
@interval = null
@lastPubDate = null
@lastPubTitle = null
@hashCache = [];
@initialized = false;
@timer = null
@watch = =>

Expand All @@ -25,11 +26,17 @@ class Watcher extends EventEmitter
return @emit 'error', err if err

for article in articles
if (@lastPubDate is null and @lastPubTitle is null) or
(@lastPubDate <= article.pubDate/1000 and @lastPubTitle isnt article.title)
@emit 'new article',article
@lastPubDate = article.pubDate / 1000
@lastPubTitle = article.title
hash = crypto.createHash('md5').update(JSON.stringify({
"date": article.pubDate,
"title": article.title
})).digest('hex');
if (@hashCache.indexOf(hash) == -1)
@emit 'new article',article if @initialized
@hashCache.unshift(hash);
# Free up memory
@hashCache.pop() if @hashCache.length > 100;

@initialized = true

return setInterval ->
fetch(@feedUrl)
Expand All @@ -52,7 +59,6 @@ class Watcher extends EventEmitter
initialize = (callback)=>
request @feedUrl,(err,articles)=>
return callback new Error(err),null if err? and callback?
@lastPubDate = articles[articles.length-1].pubDate / 1000
@timer = @watch()
return callback null,articles if callback?

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