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| 1 # Copyright 2010 Google Inc. | |
| 2 # | |
| 3 # Permission is hereby granted, free of charge, to any person obtaining a | |
| 4 # copy of this software and associated documentation files (the | |
| 5 # "Software"), to deal in the Software without restriction, including | |
| 6 # without limitation the rights to use, copy, modify, merge, publish, dis- | |
| 7 # tribute, sublicense, and/or sell copies of the Software, and to permit | |
| 8 # persons to whom the Software is furnished to do so, subject to the fol- | |
| 9 # lowing conditions: | |
| 10 # | |
| 11 # The above copyright notice and this permission notice shall be included | |
| 12 # in all copies or substantial portions of the Software. | |
| 13 # | |
| 14 # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS | |
| 15 # OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABIL- | |
| 16 # ITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT | |
| 17 # SHALL THE AUTHOR BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, | |
| 18 # WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
| 19 # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS | |
| 20 # IN THE SOFTWARE. | |
| 21 | |
| 22 """ | |
| 23 Test harnass that allows us to raise exceptions, change file content, | |
| 24 and record the byte transfer callback sequence, to test various resumable | |
| 25 upload and download cases. The 'call' method of this harnass can be passed | |
| 26 as the 'cb' parameter to boto.s3.Key.send_file() and boto.s3.Key.get_file(), | |
| 27 allowing testing of various file upload/download conditions. | |
| 28 """ | |
| 29 | |
| 30 import socket | |
| 31 | |
| 32 | |
| 33 class CallbackTestHarnass(object): | |
| 34 | |
| 35 def __init__(self, fail_after_n_bytes=0, num_times_to_fail=1, | |
| 36 exception=socket.error('mock socket error', 0), | |
| 37 fp_to_change=None, fp_change_pos=None): | |
| 38 self.fail_after_n_bytes = fail_after_n_bytes | |
| 39 self.num_times_to_fail = num_times_to_fail | |
| 40 self.exception = exception | |
| 41 # If fp_to_change and fp_change_pos are specified, 3 bytes will be | |
| 42 # written at that position just before the first exception is thrown. | |
| 43 self.fp_to_change = fp_to_change | |
| 44 self.fp_change_pos = fp_change_pos | |
| 45 self.num_failures = 0 | |
| 46 self.transferred_seq_before_first_failure = [] | |
| 47 self.transferred_seq_after_first_failure = [] | |
| 48 | |
| 49 def call(self, total_bytes_transferred, unused_total_size): | |
| 50 """ | |
| 51 To use this test harnass, pass the 'call' method of the instantiated | |
| 52 object as the cb param to the set_contents_from_file() or | |
| 53 get_contents_to_file() call. | |
| 54 """ | |
| 55 # Record transfer sequence to allow verification. | |
| 56 if self.num_failures: | |
| 57 self.transferred_seq_after_first_failure.append( | |
| 58 total_bytes_transferred) | |
| 59 else: | |
| 60 self.transferred_seq_before_first_failure.append( | |
| 61 total_bytes_transferred) | |
| 62 if (total_bytes_transferred >= self.fail_after_n_bytes and | |
| 63 self.num_failures < self.num_times_to_fail): | |
| 64 self.num_failures += 1 | |
| 65 if self.fp_to_change and self.fp_change_pos is not None: | |
| 66 cur_pos = self.fp_to_change.tell() | |
| 67 self.fp_to_change.seek(self.fp_change_pos) | |
| 68 self.fp_to_change.write('abc') | |
| 69 self.fp_to_change.seek(cur_pos) | |
| 70 self.called = True | |
| 71 raise self.exception | |
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