211 lines
6.3 KiB
Python
211 lines
6.3 KiB
Python
# -*- coding: utf-8 -*-
|
|
# vi:si:et:sw=4:sts=4:ts=4
|
|
# GPL 2008
|
|
import gzip
|
|
import hashlib
|
|
import os
|
|
import StringIO
|
|
import time
|
|
import urlparse
|
|
import urllib2
|
|
import sqlite3
|
|
|
|
import chardet
|
|
import simplejson
|
|
|
|
import net
|
|
from net import DEFAULT_HEADERS, getEncoding
|
|
|
|
|
|
cache_timeout = 30*24*60*60 # default is 30 days
|
|
|
|
|
|
def status(url, data=None, headers=DEFAULT_HEADERS, timeout=cache_timeout):
|
|
'''
|
|
>>> status('http://google.com')
|
|
200
|
|
>>> status('http://google.com/mysearch')
|
|
404
|
|
'''
|
|
headers = getHeaders(url, data, headers)
|
|
return int(headers['status'])
|
|
|
|
def exists(url, data=None, headers=DEFAULT_HEADERS, timeout=cache_timeout):
|
|
'''
|
|
>>> exists('http://google.com')
|
|
True
|
|
>>> exists('http://google.com/mysearch')
|
|
False
|
|
'''
|
|
s = status(url, data, headers, timeout)
|
|
if s >= 200 and s < 400:
|
|
return True
|
|
return False
|
|
|
|
def getHeaders(url, data=None, headers=DEFAULT_HEADERS, timeout=cache_timeout):
|
|
url_headers = _getUrlCache(url, data, headers, timeout, "headers")
|
|
if url_headers:
|
|
url_headers = simplejson.loads(url_headers)
|
|
else:
|
|
url_headers = net.getHeaders(url, data, headers)
|
|
_saveUrlCache(url, data, -1, url_headers)
|
|
return url_headers
|
|
|
|
class InvalidResult(Exception):
|
|
"""Base class for exceptions in this module."""
|
|
def __init__(self, result, headers):
|
|
self.result = result
|
|
self.headers = headers
|
|
|
|
def getUrl(url, data=None, headers=DEFAULT_HEADERS, timeout=cache_timeout, valid=None):
|
|
'''
|
|
url - url to load
|
|
data - possible post data
|
|
headers - headers to send with request
|
|
timeout - get from cache if cache not older than given seconds, -1 to get from cache
|
|
valid - function to check if result is ok, its passed result and headers
|
|
if this function fails, InvalidResult will be raised deal with it in your code
|
|
'''
|
|
#FIXME: send last-modified / etag from cache and only update if needed
|
|
if isinstance(url, unicode):
|
|
url = url.encode('utf-8')
|
|
result = _getUrlCache(url, data, headers, timeout)
|
|
if not result:
|
|
#print "get data", url
|
|
try:
|
|
url_headers, result = net.getUrl(url, data, headers, returnHeaders=True)
|
|
except urllib2.HTTPError, e:
|
|
e.headers['Status'] = "%s" % e.code
|
|
url_headers = dict(e.headers)
|
|
result = e.read()
|
|
if url_headers.get('content-encoding', None) == 'gzip':
|
|
result = gzip.GzipFile(fileobj=StringIO.StringIO(result)).read()
|
|
if not valid or valid(result, url_headers):
|
|
_saveUrlCache(url, data, result, url_headers)
|
|
else:
|
|
raise InvalidResult(result, url_headers)
|
|
return result
|
|
|
|
def getUrlUnicode(url, data=None, headers=DEFAULT_HEADERS, timeout=cache_timeout, _getUrl=getUrl, valid=None):
|
|
data = _getUrl(url, data, headers, timeout, valid)
|
|
encoding = getEncoding(data)
|
|
if not encoding:
|
|
encoding = 'latin-1'
|
|
return unicode(data, encoding)
|
|
|
|
def _getCacheBase():
|
|
'cache base is eather ~/.ox/cache or can set via env variable oxCACHE'
|
|
return os.environ.get('oxCACHE', os.path.expanduser('~/.ox/cache'))
|
|
|
|
def _getCacheDB():
|
|
return os.path.join(_getCacheBase(), "cache.sqlite")
|
|
|
|
def _connectDb():
|
|
conn = sqlite3.connect(_getCacheDB(), timeout=10)
|
|
conn.text_factory = str
|
|
return conn
|
|
|
|
def _createDb(c):
|
|
# Create table and indexes
|
|
c.execute('''CREATE TABLE IF NOT EXISTS cache (url_hash varchar(42) unique, domain text, url text,
|
|
post_data text, headers text, created int, data blob, only_headers int)''')
|
|
c.execute('''CREATE INDEX IF NOT EXISTS cache_domain ON cache (domain)''')
|
|
c.execute('''CREATE INDEX IF NOT EXISTS cache_url ON cache (url)''')
|
|
c.execute('''CREATE INDEX IF NOT EXISTS cache_url_hash ON cache (url_hash)''')
|
|
|
|
|
|
def _getUrlCache(url, data, headers=DEFAULT_HEADERS, timeout=-1, value="data"):
|
|
r = None
|
|
if timeout == 0:
|
|
return r
|
|
|
|
if data:
|
|
url_hash = hashlib.sha1(url + '?' + data).hexdigest()
|
|
else:
|
|
url_hash = hashlib.sha1(url).hexdigest()
|
|
|
|
conn = _connectDb()
|
|
c = conn.cursor()
|
|
_createDb(c)
|
|
|
|
sql = 'SELECT %s FROM cache WHERE url_hash=?' % value
|
|
if timeout > 0:
|
|
now = time.mktime(time.localtime())
|
|
t = (url_hash, now-timeout)
|
|
sql += ' AND created > ?'
|
|
else:
|
|
t = (url_hash, )
|
|
if value != "headers":
|
|
sql += ' AND only_headers != 1 '
|
|
c.execute(sql, t)
|
|
for row in c:
|
|
r = row[0]
|
|
if value == 'data':
|
|
r = str(r)
|
|
break
|
|
|
|
c.close()
|
|
conn.close()
|
|
return r
|
|
|
|
def _saveUrlCache(url, post_data, data, headers):
|
|
if post_data:
|
|
url_hash = hashlib.sha1(url + '?' + post_data).hexdigest()
|
|
else:
|
|
url_hash = hashlib.sha1(url).hexdigest()
|
|
|
|
domain = ".".join(urlparse.urlparse(url)[1].split('.')[-2:])
|
|
|
|
conn = _connectDb()
|
|
c = conn.cursor()
|
|
|
|
# Create table if not exists
|
|
_createDb(c)
|
|
|
|
# Insert a row of data
|
|
if not post_data: post_data=""
|
|
only_headers = 0
|
|
if data == -1:
|
|
only_headers = 1
|
|
data = ""
|
|
created = time.mktime(time.localtime())
|
|
t = (url_hash, domain, url, post_data, simplejson.dumps(headers), created, sqlite3.Binary(data), only_headers)
|
|
c.execute(u"""INSERT OR REPLACE INTO cache values (?, ?, ?, ?, ?, ?, ?, ?)""", t)
|
|
|
|
# Save (commit) the changes and clean up
|
|
conn.commit()
|
|
c.close()
|
|
conn.close()
|
|
|
|
def migrate_to_db():
|
|
import re
|
|
import os
|
|
import sqlite3
|
|
import glob
|
|
|
|
conn = _connectDb()
|
|
c = conn.cursor()
|
|
_createDb(c)
|
|
|
|
files = glob.glob(_getCacheBase() + "/*/*/*/*/*")
|
|
_files = filter(lambda x: not x.endswith(".headers"), files)
|
|
|
|
for f in _files:
|
|
info = re.compile("%s/(.*?)/../../../(.*)" % _getCacheBase()).findall(f)
|
|
domain = url = info[0][0]
|
|
url_hash = info[0][1]
|
|
post_data = ""
|
|
created = os.stat(f).st_ctime
|
|
fd = open(f, "r")
|
|
data = fd.read()
|
|
fd.close()
|
|
fd = open(f + ".headers", "r")
|
|
headers = fd.read()
|
|
fd.close()
|
|
t = (url_hash, domain, url, post_data, headers, created, sqlite3.Binary(data), 0)
|
|
c.execute(u"""INSERT OR REPLACE INTO cache values (?, ?, ?, ?, ?, ?, ?, ?)""", t)
|
|
|
|
conn.commit()
|
|
c.close()
|
|
conn.close()
|
|
|