225 lines
6.7 KiB
Python
225 lines
6.7 KiB
Python
# -*- coding: utf-8 -*-
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# vi:si:et:sw=4:sts=4:ts=4
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# GPL 2008
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import gzip
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import hashlib
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import os
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import StringIO
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import time
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import urlparse
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import urllib2
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import sqlite3
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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_headers = _readUrlCache(url, data, headers, timeout, "headers")
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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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_saveUrlCache(url, data, -1, url_headers)
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return url_headers
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class InvalidResult(Exception):
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"""Base class for exceptions in this module."""
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def __init__(self, result, headers):
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self.result = result
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self.headers = headers
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def readUrl(url, data=None, headers=DEFAULT_HEADERS, timeout=cache_timeout, valid=None):
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'''
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url - url to load
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data - possible post data
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headers - headers to send with request
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timeout - get from cache if cache not older than given seconds, -1 to get from cache
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valid - function to check if result is ok, its passed result and headers
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if this function fails, InvalidResult will be raised deal with it in your code
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'''
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#FIXME: send last-modified / etag from cache and only update if needed
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if isinstance(url, unicode):
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url = url.encode('utf-8')
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result = _readUrlCache(url, data, headers, timeout)
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if not result:
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#print "get data", url
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try:
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url_headers, result = net.readUrl(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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if not valid or valid(result, url_headers):
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_saveUrlCache(url, data, result, url_headers)
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else:
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raise InvalidResult(result, url_headers)
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return result
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def readUrlUnicode(url, data=None, headers=DEFAULT_HEADERS, timeout=cache_timeout, _readUrl=readUrl, valid=None):
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data = _readUrl(url, data, headers, timeout, valid)
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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 saveUrl(url, filename, overwrite=False):
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if not os.path.exists(filename) or overwrite:
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dirname = os.path.dirname(filename)
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if not os.path.exists(dirname):
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os.makedirs(dirname)
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data = readUrl(url)
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f = open(filename, 'w')
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f.write(data)
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f.close()
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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 _getCacheDB():
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path = _getCacheBase()
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if not os.path.exists(path):
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os.makedirs(path)
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return os.path.join(path, "cache.sqlite")
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def _connectDb():
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conn = sqlite3.connect(_getCacheDB(), timeout=10)
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conn.text_factory = str
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return conn
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def _createDb(c):
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# Create table and indexes
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c.execute('''CREATE TABLE IF NOT EXISTS cache (url_hash varchar(42) unique, domain text, url text,
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post_data text, headers text, created int, data blob, only_headers int)''')
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c.execute('''CREATE INDEX IF NOT EXISTS cache_domain ON cache (domain)''')
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c.execute('''CREATE INDEX IF NOT EXISTS cache_url ON cache (url)''')
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c.execute('''CREATE INDEX IF NOT EXISTS cache_url_hash ON cache (url_hash)''')
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def _readUrlCache(url, data, headers=DEFAULT_HEADERS, timeout=-1, value="data"):
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r = None
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if timeout == 0:
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return r
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if data:
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url_hash = hashlib.sha1(url + '?' + data).hexdigest()
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else:
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url_hash = hashlib.sha1(url).hexdigest()
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conn = _connectDb()
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c = conn.cursor()
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_createDb(c)
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sql = 'SELECT %s FROM cache WHERE url_hash=?' % value
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if timeout > 0:
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now = time.mktime(time.localtime())
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t = (url_hash, now-timeout)
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sql += ' AND created > ?'
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else:
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t = (url_hash, )
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if value != "headers":
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sql += ' AND only_headers != 1 '
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c.execute(sql, t)
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for row in c:
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r = row[0]
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if value == 'data':
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r = str(r)
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break
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c.close()
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conn.close()
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return r
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def _saveUrlCache(url, post_data, data, headers):
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if post_data:
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url_hash = hashlib.sha1(url + '?' + post_data).hexdigest()
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else:
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url_hash = hashlib.sha1(url).hexdigest()
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domain = ".".join(urlparse.urlparse(url)[1].split('.')[-2:])
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conn = _connectDb()
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c = conn.cursor()
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# Create table if not exists
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_createDb(c)
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# Insert a row of data
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if not post_data: post_data=""
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only_headers = 0
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if data == -1:
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only_headers = 1
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data = ""
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created = time.mktime(time.localtime())
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t = (url_hash, domain, url, post_data, simplejson.dumps(headers), created, sqlite3.Binary(data), only_headers)
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c.execute(u"""INSERT OR REPLACE INTO cache values (?, ?, ?, ?, ?, ?, ?, ?)""", t)
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# Save (commit) the changes and clean up
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conn.commit()
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c.close()
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conn.close()
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def migrate_to_db():
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import re
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import os
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import sqlite3
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import glob
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conn = _connectDb()
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c = conn.cursor()
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_createDb(c)
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files = glob.glob(_getCacheBase() + "/*/*/*/*/*")
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_files = filter(lambda x: not x.endswith(".headers"), files)
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for f in _files:
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info = re.compile("%s/(.*?)/../../../(.*)" % _getCacheBase()).findall(f)
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domain = url = info[0][0]
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url_hash = info[0][1]
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post_data = ""
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created = os.stat(f).st_ctime
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fd = open(f, "r")
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data = fd.read()
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fd.close()
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fd = open(f + ".headers", "r")
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headers = fd.read()
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fd.close()
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t = (url_hash, domain, url, post_data, headers, created, sqlite3.Binary(data), 0)
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c.execute(u"""INSERT OR REPLACE INTO cache values (?, ?, ?, ?, ?, ?, ?, ?)""", t)
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conn.commit()
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c.close()
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conn.close()
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