caching, index page, threading
parent
804356a139
commit
23f06f73a2
98
app.py
98
app.py
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@ -1,12 +1,94 @@
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from flask import Flask, Response
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from parsers.nvidia import *
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from flask import Flask, Response, abort
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from parsers.nvidia import NvidiaParser
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import os, time, threading
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class ParserData:
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parser = None
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rss = None
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time = None
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lock = threading.Lock()
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def __init__(self, parser):
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self.parser = parser
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app = Flask(__name__)
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@app.route("/")
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def index():
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return "<p>Hello, World!</p>"
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parsers = [ParserData(NvidiaParser())]
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def getCachePath(parser):
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path = './_cache/' + parser.__class__.__name__
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return path
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def checkParserCache(parser):
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path = getCachePath(parser.parser)
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try:
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os.path.getmtime(path)
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with open(path, 'r') as f:
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parser.rss = f.read()
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except:
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os.makedirs(os.path.dirname(path), exist_ok=True)
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open(path, 'w').close()
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return True
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filetime = os.path.getmtime(path)
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currtime = time.time()
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parser.time = filetime
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return (currtime - filetime) > parser.parser.CACHE_TIMEOUT
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def updateParserAndCache(parser):
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rss = parser.parser.getRss()
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with parser.lock:
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parser.rss = rss
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parser.time = time.time()
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with open(getCachePath(parser.parser), 'w') as f:
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f.write(parser.rss.decode('utf-8'))
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def runParserWorker(parser):
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if checkParserCache(parser):
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updateParserAndCache(parser)
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while True:
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nextmark = parser.time + parser.parser.CACHE_TIMEOUT
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sleepfor = nextmark - time.time()
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if sleepfor > 0:
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time.sleep(nextmark - time.time())
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updateParserAndCache(parser)
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def runParserWorkers():
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for parser in parsers:
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threading.Thread(target=runParserWorker, args=(parser,)).start()
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indexPage = """
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<html>
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<head>
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<title>RSS index page</title>
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</head>
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<body>
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<h1>RSS index page</h1>
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<h3>Custom generators of RSS feed from different blogs</h3>
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<br/>
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"""
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for parser in parsers:
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indexPage += f'<a href={parser.parser.URL}>{parser.parser.NAME}</a>'
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indexPage += '</body>'
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indexPage += '</html>'
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@app.route('/')
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def index():
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return indexPage
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runParserWorkers()
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for parser in parsers:
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@app.route(parser.parser.URL)
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def query():
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with parser.lock:
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if parser.rss == None:
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abort(404)
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return Response(parser.rss, mimetype='text/xml')
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@app.route("/nvidia")
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def rss_query():
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return Response(parseNvidia(), mimetype='text/xml')
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@ -1,27 +1,52 @@
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from pyquery import PyQuery as pq
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from feedgen.feed import FeedGenerator
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from collections import namedtuple
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import multiprocessing
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from datetime import datetime
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def parseNvidia():
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root_url = 'https://research.nvidia.com'
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d = pq(root_url +'/publications')
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Entry = namedtuple('Entry', 'url fe')
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fg = FeedGenerator()
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fg.id(root_url)
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fg.title('NVidia Research')
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fg.link(href=root_url, rel='alternate')
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fg.logo(root_url + '/favicon.ico')
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fg.description('NVidia Research papers')
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class NvidiaParser:
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NAME = 'NVidia Research'
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URL = '/nvidia'
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CACHE_TIMEOUT = 3600
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for elem in d('.views-field-title').items():
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link = elem.find('a')
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url = root_url + link.attr.href
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title = link.text()
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def parseNvidiaDate(entry):
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dom = pq(entry.url)
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print(entry.url)
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fe = fg.add_entry()
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fe.id(url)
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fe.title(title)
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fe.link(href=url)
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time = dom('.field--name-field-publication-date').find('time').attr.datetime
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time = datetime.strptime(time, '%Y-%m-%dT%H:%M:%S%z')
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entry.fe.pubDate(time)
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return fg.rss_str()
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def getRss(self):
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root_url = 'https://research.nvidia.com'
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d = pq(root_url +'/publications')
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fg = FeedGenerator()
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fg.id(root_url)
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fg.title('NVidia Research')
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fg.link(href=root_url, rel='alternate')
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fg.logo(root_url + '/themes/custom/nvidia/favicon.ico')
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fg.description('NVidia Research papers')
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entries = []
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print('RSS GOT')
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for elem in d('.views-field-title').items():
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link = elem.find('a')
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url = root_url + link.attr.href
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title = link.text()
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fe = fg.add_entry()
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fe.id(url)
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fe.title(title)
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fe.link(href=url)
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entries.append(Entry(url, fe))
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with multiprocessing.Pool(8) as p:
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p.map(NvidiaParser.parseNvidiaDate, entries)
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return fg.rss_str()
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