118 lines
3.7 KiB
Python
118 lines
3.7 KiB
Python
# -*- coding: utf-8 -*-
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# vi:si:et:sw=4:sts=4:ts=4
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# 2008
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import gzip
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import StringIO
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import os
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import sha
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import time
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import urlparse
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import urllib2
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import chardet
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import simplejson
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import net
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from net import DEFAULT_HEADERS, getEncoding
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_cache_timeout = 30*24*60*60 # default is 30 days
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def status(url, data=None, headers=DEFAULT_HEADERS, timeout=_cache_timeout):
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'''
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>>> status('http://google.com')
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200
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>>> status('http://google.com/mysearch')
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404
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'''
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headers = getHeaders(url, data, headers)
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return int(headers['status'])
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def exists(url, data=None, headers=DEFAULT_HEADERS, timeout=_cache_timeout):
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'''
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>>> exists('http://google.com')
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True
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>>> exists('http://google.com/mysearch')
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False
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'''
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s = status(url, data, headers, timeout)
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if s >= 200 and s < 400:
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return True
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return False
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def getHeaders(url, data=None, headers=DEFAULT_HEADERS, timeout=_cache_timeout):
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url_cache_file = "%s.headers" % _getUrlCacheFile(url, data, headers)
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url_headers = _loadUrlCache(url_cache_file, timeout)
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if url_headers:
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url_headers = simplejson.loads(url_headers)
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else:
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url_headers = net.getHeaders(url, data, headers)
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_saveUrlHeaders(url_cache_file, url_headers)
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return url_headers
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def getUrl(url, data=None, headers=DEFAULT_HEADERS, timeout=_cache_timeout):
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url_cache_file = _getUrlCacheFile(url, data, headers)
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result = _loadUrlCache(url_cache_file, timeout)
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if not result:
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try:
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url_headers, result = net.getUrl(url, data, headers, returnHeaders=True)
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except urllib2.HTTPError, e:
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e.headers['Status'] = "%s" % e.code
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url_headers = dict(e.headers)
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result = e.read()
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if url_headers.get('content-encoding', None) == 'gzip':
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result = gzip.GzipFile(fileobj=StringIO.StringIO(result)).read()
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_saveUrlCache(url_cache_file, result, url_headers)
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return result
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def getUrlUnicode(url, data=None, headers=DEFAULT_HEADERS, timeout=_cache_timeout, _getUrl=getUrl):
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data = _getUrl(url, data, headers, timeout)
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encoding = getEncoding(data)
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if not encoding:
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encoding = 'latin-1'
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return unicode(data, encoding)
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def _getCacheBase():
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'cache base is eather ~/.ox/cache or can set via env variable oxCACHE'
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return os.environ.get('oxCACHE', os.path.expanduser('~/.ox/cache'))
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def _getUrlCacheFile(url, data=None, headers=DEFAULT_HEADERS):
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if data:
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url_hash = sha.sha(url + '?' + data).hexdigest()
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else:
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url_hash = sha.sha(url).hexdigest()
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domain = ".".join(urlparse.urlparse(url)[1].split('.')[-2:])
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return os.path.join(_getCacheBase(), domain, url_hash[:2], url_hash[2:4], url_hash[4:6], url_hash)
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def _loadUrlCache(url_cache_file, timeout=_cache_timeout):
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if timeout == 0:
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return None
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if os.path.exists(url_cache_file):
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ctime = os.stat(url_cache_file).st_ctime
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now = time.mktime(time.localtime())
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file_age = now-ctime
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if timeout < 0 or file_age < timeout:
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f = open(url_cache_file)
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data = f.read()
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f.close()
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return data
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return None
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def _saveUrlCache(url_cache_file, data, headers):
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folder = os.path.dirname(url_cache_file)
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if not os.path.exists(folder):
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os.makedirs(folder)
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f = open(url_cache_file, 'w')
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f.write(data)
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f.close()
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_saveUrlHeaders("%s.headers" % url_cache_file, headers)
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def _saveUrlHeaders(url_cache_file, headers):
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folder = os.path.dirname(url_cache_file)
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if not os.path.exists(folder):
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os.makedirs(folder)
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f = open(url_cache_file, 'w')
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f.write(simplejson.dumps(headers))
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f.close()
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