331 lines
10 KiB
Python
331 lines
10 KiB
Python
# -*- coding: utf-8 -*-
|
|
# vi:si:et:sw=4:sts=4:ts=4
|
|
# GPL 2011
|
|
from __future__ import with_statement
|
|
|
|
import gzip
|
|
import zlib
|
|
import hashlib
|
|
import os
|
|
import StringIO
|
|
import time
|
|
import urlparse
|
|
import urllib2
|
|
import sqlite3
|
|
|
|
import chardet
|
|
from utils import json
|
|
from .file import makedirs
|
|
|
|
import net
|
|
from net import DEFAULT_HEADERS, detect_encoding
|
|
|
|
cache_timeout = 30*24*60*60 # default is 30 days
|
|
|
|
COMPRESS_TYPES = (
|
|
'text/html',
|
|
'text/plain',
|
|
'text/xml',
|
|
'application/xhtml+xml',
|
|
'application/x-javascript',
|
|
'application/javascript',
|
|
'application/ecmascript',
|
|
'application/rss+xml'
|
|
)
|
|
|
|
def status(url, data=None, headers=DEFAULT_HEADERS, timeout=cache_timeout):
|
|
'''
|
|
>>> status('http://google.com')
|
|
200
|
|
>>> status('http://google.com/mysearch')
|
|
404
|
|
'''
|
|
headers = get_headers(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 get_headers(url, data=None, headers=DEFAULT_HEADERS, timeout=cache_timeout):
|
|
url_headers = store.get(url, data, headers, timeout, "headers")
|
|
if not url_headers:
|
|
url_headers = net.get_headers(url, data, headers)
|
|
store.set(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 _fix_unicode_url(url):
|
|
if isinstance(url, unicode):
|
|
url = url.encode('utf-8')
|
|
return url
|
|
|
|
def read_url(url, data=None, headers=DEFAULT_HEADERS, timeout=cache_timeout, valid=None, unicode=False):
|
|
'''
|
|
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
|
|
'''
|
|
if net.DEBUG:
|
|
print 'ox.cache.read_url', url
|
|
#FIXME: send last-modified / etag from cache and only update if needed
|
|
url = _fix_unicode_url(url)
|
|
result = store.get(url, data, headers, timeout)
|
|
if not result:
|
|
try:
|
|
url_headers, result = net.read_url(url, data, headers, return_headers=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):
|
|
store.set(url, post_data=data, data=result, headers=url_headers)
|
|
else:
|
|
raise InvalidResult(result, url_headers)
|
|
if unicode:
|
|
encoding = detect_encoding(result)
|
|
if not encoding:
|
|
encoding = 'latin-1'
|
|
result = result.decode(encoding)
|
|
return result
|
|
|
|
def save_url(url, filename, overwrite=False):
|
|
if not os.path.exists(filename) or overwrite:
|
|
dirname = os.path.dirname(filename)
|
|
if not os.path.exists(dirname):
|
|
os.makedirs(dirname)
|
|
data = read_url(url)
|
|
f = open(filename, 'w')
|
|
f.write(data)
|
|
f.close()
|
|
|
|
def cache_path():
|
|
return os.environ.get('oxCACHE', os.path.expanduser('~/.ox/cache'))
|
|
|
|
class Cache:
|
|
def __init__(self):
|
|
pass
|
|
|
|
def get(self, url, data, headers=DEFAULT_HEADERS, timeout=-1, value="data"):
|
|
'''
|
|
if value == 'data' return data of url if its in the cache else None
|
|
if value == 'headers' return headers for url
|
|
'''
|
|
pass
|
|
|
|
def set(self, url, post_data, data, headers):
|
|
pass
|
|
|
|
class SQLiteCache(Cache):
|
|
def __init__(self):
|
|
path = cache_path()
|
|
if not os.path.exists(path):
|
|
os.makedirs(path)
|
|
self.db = os.path.join(path, "cache.sqlite")
|
|
self.create()
|
|
|
|
def connect(self):
|
|
conn = sqlite3.connect(self.db, timeout=10)
|
|
conn.text_factory = str
|
|
return conn
|
|
|
|
def create(self):
|
|
conn = self.connect()
|
|
c = conn.cursor()
|
|
# 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)''')
|
|
|
|
c.execute('''CREATE TABLE IF NOT EXISTS setting (key varchar(1024) unique, value text)''')
|
|
if int(self.get_setting(c, 'version', 0)) < 1:
|
|
self.set_setting(c, 'version', 1)
|
|
c.execute('''ALTER TABLE cache ADD compressed INT DEFAULT 0''')
|
|
conn.commit()
|
|
|
|
def get_setting(self, c, key, default=None):
|
|
c.execute('SELECT value FROM setting WHERE key = ?', (key, ))
|
|
for row in c:
|
|
return row[0]
|
|
return default
|
|
|
|
def set_setting(self, c, key, value):
|
|
c.execute(u'INSERT OR REPLACE INTO setting values (?, ?)', (key, str(value)))
|
|
|
|
def get(self, 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 = self.connect()
|
|
c = conn.cursor()
|
|
sql = 'SELECT %s, compressed 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 == 'headers':
|
|
r = json.loads(r)
|
|
elif value == 'data':
|
|
if row[1] == 1:
|
|
r = zlib.decompress(r)
|
|
else:
|
|
r = str(r)
|
|
break
|
|
|
|
c.close()
|
|
conn.close()
|
|
return r
|
|
|
|
def set(self, 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 = self.connect()
|
|
c = conn.cursor()
|
|
|
|
# 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())
|
|
content_type = headers.get('content-type', '').split(';')[0].strip()
|
|
if content_type in COMPRESS_TYPES:
|
|
compressed = 1
|
|
data = zlib.compress(data)
|
|
else:
|
|
compressed = 0
|
|
data = sqlite3.Binary(data)
|
|
|
|
#fixme: this looks wrong
|
|
try:
|
|
_headers = json.dumps(headers)
|
|
except:
|
|
for h in headers:
|
|
headers[h] = headers[h].decode(detect_encoding(headers[h]))
|
|
_headers = json.dumps(headers)
|
|
t = (url_hash, domain, url, post_data, _headers, created,
|
|
data, only_headers, compressed)
|
|
c.execute(u"""INSERT OR REPLACE INTO cache values (?, ?, ?, ?, ?, ?, ?, ?, ?)""", t)
|
|
|
|
# Save (commit) the changes and clean up
|
|
conn.commit()
|
|
c.close()
|
|
conn.close()
|
|
|
|
class FileCache(Cache):
|
|
def __init__(self):
|
|
f, self.root = cache_path().split(':')
|
|
|
|
def files(self, domain, h):
|
|
prefix = os.path.join(self.root, domain, h[:2], h[2:4], h[4:6], h[6:8])
|
|
i = os.path.join(prefix, '%s.json'%h)
|
|
f = os.path.join(prefix, '%s.dat'%h)
|
|
return prefix, i, f
|
|
|
|
def get(self, 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()
|
|
|
|
domain = ".".join(urlparse.urlparse(url)[1].split('.')[-2:])
|
|
prefix, i, f = self.files(domain, url_hash)
|
|
if os.path.exists(i):
|
|
with open(i) as _i:
|
|
try:
|
|
info = json.load(_i)
|
|
except:
|
|
return r
|
|
now = time.mktime(time.localtime())
|
|
expired = now-timeout
|
|
|
|
if value != 'headers' and info['only_headers']:
|
|
return None
|
|
if timeout < 0 or info['created'] > expired:
|
|
if value == 'headers':
|
|
r = info['headers']
|
|
else:
|
|
with open(f) as data:
|
|
r = data.read()
|
|
if info['compressed']:
|
|
r = zlib.decompress(r)
|
|
return r
|
|
|
|
def set(self, 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:])
|
|
prefix, i, f = self.files(domain, url_hash)
|
|
makedirs(prefix)
|
|
|
|
created = time.mktime(time.localtime())
|
|
content_type = headers.get('content-type', '').split(';')[0].strip()
|
|
|
|
info = {
|
|
'compressed': content_type in COMPRESS_TYPES,
|
|
'only_headers': data == -1,
|
|
'created': created,
|
|
'headers': headers,
|
|
'url': url,
|
|
}
|
|
if post_data:
|
|
info['post_data'] = post_data
|
|
if not info['only_headers']:
|
|
if info['compressed']:
|
|
data = zlib.compress(data)
|
|
with open(f, 'w') as _f:
|
|
_f.write(data)
|
|
with open(i, 'w') as _i:
|
|
json.dump(info, _i)
|
|
|
|
if cache_path().startswith('fs:'):
|
|
store = FileCache()
|
|
else:
|
|
store = SQLiteCache()
|
|
|