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1 # Copyright (C) 2011 Google Inc. All rights reserved. | |
2 # | |
3 # Redistribution and use in source and binary forms, with or without | |
4 # modification, are permitted provided that the following conditions are | |
5 # met: | |
6 # | |
7 # * Redistributions of source code must retain the above copyright | |
8 # notice, this list of conditions and the following disclaimer. | |
9 # * Redistributions in binary form must reproduce the above | |
10 # copyright notice, this list of conditions and the following disclaimer | |
11 # in the documentation and/or other materials provided with the | |
12 # distribution. | |
13 # * Neither the name of Google Inc. nor the names of its | |
14 # contributors may be used to endorse or promote products derived from | |
15 # this software without specific prior written permission. | |
16 # | |
17 # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
18 # "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
19 # LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | |
20 # A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
21 # OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
22 # SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | |
23 # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
24 # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
25 # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
26 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
27 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
28 | |
29 """Wrapper module for fetching URLs.""" | |
30 | |
31 import urllib | |
32 | |
33 | |
34 class UrlFetcher(object): | |
35 """Class with restricted interface to fetch URLs (makes testing easier)""" | |
36 def __init__(self, filesystem): | |
37 self._filesystem = filesystem | |
38 | |
39 def fetch(self, url): | |
40 """Fetches the contents of the URL as a string.""" | |
41 file_object = urllib.urlopen(url) | |
42 content = file_object.read() | |
43 file_object.close() | |
44 return content | |
45 | |
46 def fetch_into_file(self, url): | |
47 """Fetches the contents of the URL into a temporary file and return the
filename. | |
48 | |
49 This is the equivalent of urllib.retrieve() except that we don't return
any headers. | |
50 """ | |
51 file_object, filename = self._filesystem.open_binary_tempfile('-fetched'
) | |
52 contents = self.fetch(url) | |
53 file_object.write(contents) | |
54 file_object.close() | |
55 return filename | |
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