330 lines
10 KiB
Python
330 lines
10 KiB
Python
# -*- coding: utf-8 -*-
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# vi:si:et:sw=4:sts=4:ts=4
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# GPL 2011
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from __future__ import with_statement
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import gzip
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import zlib
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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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from utils import json
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from .file import makedirs
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import net
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from net import DEFAULT_HEADERS, detect_encoding
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cache_timeout = 30*24*60*60 # default is 30 days
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COMPRESS_TYPES = (
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'text/html',
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'text/plain',
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'text/xml',
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'application/xhtml+xml',
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'application/x-javascript',
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'application/javascript',
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'application/ecmascript',
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'application/rss+xml'
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)
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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 = get_headers(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 get_headers(url, data=None, headers=DEFAULT_HEADERS, timeout=cache_timeout):
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url_headers = store.get(url, data, headers, timeout, "headers")
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if not url_headers:
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url_headers = net.get_headers(url, data, headers)
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store.set(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 _fix_unicode_url(url):
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if isinstance(url, unicode):
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url = url.encode('utf-8')
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return url
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def read_url(url, data=None, headers=DEFAULT_HEADERS, timeout=cache_timeout, valid=None, unicode=False):
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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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if net.DEBUG:
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print 'ox.cache.read_url', url
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#FIXME: send last-modified / etag from cache and only update if needed
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url = _fix_unicode_url(url)
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result = store.get(url, data, headers, timeout)
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if not result:
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try:
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url_headers, result = net.read_url(url, data, headers, return_headers=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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store.set(url, post_data=data, data=result, headers=url_headers)
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else:
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raise InvalidResult(result, url_headers)
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if unicode:
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encoding = detect_encoding(result)
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if not encoding:
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encoding = 'latin-1'
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result = result.decode(encoding)
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return result
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def save_url(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 = read_url(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 cache_path():
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return os.environ.get('oxCACHE', os.path.expanduser('~/.ox/cache'))
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class Cache:
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def __init__(self):
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pass
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def get(self, url, data, headers=DEFAULT_HEADERS, timeout=-1, value="data"):
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'''
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if value == 'data' return data of url if its in the cache else None
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if value == 'headers' return headers for url
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'''
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pass
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def set(self, url, post_data, data, headers):
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pass
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class SQLiteCache(Cache):
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def __init__(self):
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path = cache_path()
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if not os.path.exists(path):
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os.makedirs(path)
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self.db = os.path.join(path, "cache.sqlite")
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self.create()
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def connect(self):
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conn = sqlite3.connect(self.db, timeout=10)
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conn.text_factory = str
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return conn
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def create(self):
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conn = self.connect()
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c = conn.cursor()
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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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c.execute('''CREATE TABLE IF NOT EXISTS setting (key varchar(1024) unique, value text)''')
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if int(self.get_setting(c, 'version', 0)) < 1:
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self.set_setting(c, 'version', 1)
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c.execute('''ALTER TABLE cache ADD compressed INT DEFAULT 0''')
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conn.commit()
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def get_setting(self, c, key, default=None):
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c.execute('SELECT value FROM setting WHERE key = ?', (key, ))
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for row in c:
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return row[0]
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return default
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def set_setting(self, c, key, value):
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c.execute(u'INSERT OR REPLACE INTO setting values (?, ?)', (key, str(value)))
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def get(self, 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 = self.connect()
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c = conn.cursor()
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sql = 'SELECT %s, compressed 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 == 'headers':
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r = json.loads(r)
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elif value == 'data':
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if row[1] == 1:
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r = zlib.decompress(r)
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else:
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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 set(self, 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 = self.connect()
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c = conn.cursor()
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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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content_type = headers.get('content-type', '').split(';')[0].strip()
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if content_type in COMPRESS_TYPES:
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compressed = 1
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data = zlib.compress(data)
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else:
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compressed = 0
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data = sqlite3.Binary(data)
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#fixme: this looks wrong
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try:
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_headers = json.dumps(headers)
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except:
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for h in headers:
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headers[h] = headers[h].decode(detect_encoding(headers[h]))
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_headers = json.dumps(headers)
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t = (url_hash, domain, url, post_data, _headers, created,
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data, only_headers, compressed)
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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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class FileCache(Cache):
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def __init__(self):
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f, self.root = cache_path().split(':')
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def files(self, domain, h):
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prefix = os.path.join(self.root, domain, h[:2], h[2:4], h[4:6], h[6:8])
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i = os.path.join(prefix, '%s.json'%h)
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f = os.path.join(prefix, '%s.dat'%h)
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return prefix, i, f
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def get(self, 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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domain = ".".join(urlparse.urlparse(url)[1].split('.')[-2:])
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prefix, i, f = self.files(domain, url_hash)
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if os.path.exists(i):
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with open(i) as _i:
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try:
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info = json.load(_i)
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except:
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return r
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now = time.mktime(time.localtime())
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expired = now-timeout
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if value != 'headers' and info['only_headers']:
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return None
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if timeout < 0 or info['created'] > expired:
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if value == 'headers':
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r = info['headers']
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else:
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with open(f) as data:
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r = data.read()
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if info['compressed']:
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r = zlib.decompress(r)
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return r
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def set(self, 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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prefix, i, f = self.files(domain, url_hash)
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makedirs(prefix)
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created = time.mktime(time.localtime())
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content_type = headers.get('content-type', '').split(';')[0].strip()
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info = {
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'compressed': content_type in COMPRESS_TYPES,
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'only_headers': data == -1,
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'created': created,
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'headers': headers,
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'url': url,
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}
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if post_data:
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info['post_data'] = post_data
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if not info['only_headers']:
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if info['compressed']:
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data = zlib.compress(data)
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with open(f, 'w') as _f:
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_f.write(data)
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with open(i, 'w') as _i:
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json.dump(info, _i)
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if cache_path().startswith('fs:'):
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store = FileCache()
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else:
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store = SQLiteCache()
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