root / snf-pithos-backend / pithos / backends / util.py @ 1ec05716
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1 | edb7875c | Christos Stavrakakis | # Copyright 2011-2012 GRNET S.A. All rights reserved.
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2 | edb7875c | Christos Stavrakakis | #
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3 | edb7875c | Christos Stavrakakis | # Redistribution and use in source and binary forms, with or
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4 | edb7875c | Christos Stavrakakis | # without modification, are permitted provided that the following
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5 | edb7875c | Christos Stavrakakis | # conditions are met:
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6 | edb7875c | Christos Stavrakakis | #
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7 | edb7875c | Christos Stavrakakis | # 1. Redistributions of source code must retain the above
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8 | edb7875c | Christos Stavrakakis | # copyright notice, this list of conditions and the following
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9 | edb7875c | Christos Stavrakakis | # disclaimer.
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10 | edb7875c | Christos Stavrakakis | #
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11 | edb7875c | Christos Stavrakakis | # 2. Redistributions in binary form must reproduce the above
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12 | edb7875c | Christos Stavrakakis | # copyright notice, this list of conditions and the following
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13 | edb7875c | Christos Stavrakakis | # disclaimer in the documentation and/or other materials
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14 | edb7875c | Christos Stavrakakis | # provided with the distribution.
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15 | edb7875c | Christos Stavrakakis | #
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16 | edb7875c | Christos Stavrakakis | # THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS
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17 | edb7875c | Christos Stavrakakis | # OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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18 | edb7875c | Christos Stavrakakis | # WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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19 | edb7875c | Christos Stavrakakis | # PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR
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20 | edb7875c | Christos Stavrakakis | # CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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21 | edb7875c | Christos Stavrakakis | # SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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22 | edb7875c | Christos Stavrakakis | # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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23 | edb7875c | Christos Stavrakakis | # USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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24 | edb7875c | Christos Stavrakakis | # AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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25 | edb7875c | Christos Stavrakakis | # LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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26 | edb7875c | Christos Stavrakakis | # ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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27 | edb7875c | Christos Stavrakakis | # POSSIBILITY OF SUCH DAMAGE.
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28 | edb7875c | Christos Stavrakakis | #
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29 | edb7875c | Christos Stavrakakis | # The views and conclusions contained in the software and
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30 | edb7875c | Christos Stavrakakis | # documentation are those of the authors and should not be
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31 | edb7875c | Christos Stavrakakis | # interpreted as representing official policies, either expressed
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32 | edb7875c | Christos Stavrakakis | # or implied, of GRNET S.A.
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33 | edb7875c | Christos Stavrakakis | |
34 | 1a736ca8 | Christos Stavrakakis | from objpool import ObjectPool |
35 | edb7875c | Christos Stavrakakis | from new import instancemethod |
36 | edb7875c | Christos Stavrakakis | from select import select |
37 | edb7875c | Christos Stavrakakis | from traceback import print_exc |
38 | edb7875c | Christos Stavrakakis | from pithos.backends import connect_backend |
39 | edb7875c | Christos Stavrakakis | |
40 | edb7875c | Christos Stavrakakis | USAGE_LIMIT = 500
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41 | edb7875c | Christos Stavrakakis | |
42 | edb7875c | Christos Stavrakakis | |
43 | edb7875c | Christos Stavrakakis | class PithosBackendPool(ObjectPool): |
44 | edb7875c | Christos Stavrakakis | def __init__(self, size=None, db_module=None, db_connection=None, |
45 | edb7875c | Christos Stavrakakis | block_module=None, block_path=None, block_umask=None, |
46 | 369a7b41 | Sofia Papagiannaki | block_size=None, hash_algorithm=None, |
47 | b1dadd0e | Sofia Papagiannaki | queue_module=None, queue_hosts=None, |
48 | 7f1f0464 | Georgios D. Tsoukalas | queue_exchange=None, free_versioning=True, |
49 | f759041f | Ilias Tsitsimpis | astakos_auth_url=None, service_token=None, |
50 | 16f2673e | Sofia Papagiannaki | astakosclient_poolsize=None,
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51 | 56f3c759 | Sofia Papagiannaki | block_params=None,
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52 | 4a105ce2 | Sofia Papagiannaki | public_url_security=None,
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53 | 19ddd41b | Sofia Papagiannaki | public_url_alphabet=None,
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54 | 19ddd41b | Sofia Papagiannaki | account_quota_policy=None,
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55 | 19ddd41b | Sofia Papagiannaki | container_quota_policy=None,
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56 | 36cae9f4 | Georgios D. Tsoukalas | container_versioning_policy=None):
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57 | edb7875c | Christos Stavrakakis | super(PithosBackendPool, self).__init__(size=size) |
58 | edb7875c | Christos Stavrakakis | self.db_module = db_module
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59 | edb7875c | Christos Stavrakakis | self.db_connection = db_connection
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60 | edb7875c | Christos Stavrakakis | self.block_module = block_module
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61 | edb7875c | Christos Stavrakakis | self.block_path = block_path
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62 | edb7875c | Christos Stavrakakis | self.block_umask = block_umask
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63 | 369a7b41 | Sofia Papagiannaki | self.block_size = block_size
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64 | 369a7b41 | Sofia Papagiannaki | self.hash_algorithm = hash_algorithm
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65 | edb7875c | Christos Stavrakakis | self.queue_module = queue_module
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66 | 47462eda | Filippos Giannakos | self.block_params = block_params
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67 | b1dadd0e | Sofia Papagiannaki | self.queue_hosts = queue_hosts
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68 | b1dadd0e | Sofia Papagiannaki | self.queue_exchange = queue_exchange
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69 | f759041f | Ilias Tsitsimpis | self.astakos_auth_url = astakos_auth_url
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70 | 16f2673e | Sofia Papagiannaki | self.service_token = service_token
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71 | 16f2673e | Sofia Papagiannaki | self.astakosclient_poolsize = astakosclient_poolsize
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72 | b1dadd0e | Sofia Papagiannaki | self.free_versioning = free_versioning
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73 | 19ddd41b | Sofia Papagiannaki | self.public_url_security = public_url_security
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74 | 19ddd41b | Sofia Papagiannaki | self.public_url_alphabet = public_url_alphabet
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75 | 19ddd41b | Sofia Papagiannaki | self.account_quota_policy = account_quota_policy
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76 | 19ddd41b | Sofia Papagiannaki | self.container_quota_policy = container_quota_policy
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77 | 19ddd41b | Sofia Papagiannaki | self.container_versioning_policy = container_versioning_policy
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78 | edb7875c | Christos Stavrakakis | |
79 | edb7875c | Christos Stavrakakis | def _pool_create(self): |
80 | b336e6fa | Georgios D. Tsoukalas | backend = connect_backend( |
81 | 36cae9f4 | Georgios D. Tsoukalas | db_module=self.db_module,
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82 | 36cae9f4 | Georgios D. Tsoukalas | db_connection=self.db_connection,
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83 | 36cae9f4 | Georgios D. Tsoukalas | block_module=self.block_module,
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84 | 36cae9f4 | Georgios D. Tsoukalas | block_path=self.block_path,
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85 | 36cae9f4 | Georgios D. Tsoukalas | block_umask=self.block_umask,
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86 | 36cae9f4 | Georgios D. Tsoukalas | block_size=self.block_size,
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87 | 36cae9f4 | Georgios D. Tsoukalas | hash_algorithm=self.hash_algorithm,
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88 | 36cae9f4 | Georgios D. Tsoukalas | queue_module=self.queue_module,
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89 | 36cae9f4 | Georgios D. Tsoukalas | block_params=self.block_params,
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90 | 36cae9f4 | Georgios D. Tsoukalas | queue_hosts=self.queue_hosts,
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91 | 36cae9f4 | Georgios D. Tsoukalas | queue_exchange=self.queue_exchange,
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92 | f759041f | Ilias Tsitsimpis | astakos_auth_url=self.astakos_auth_url,
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93 | 36cae9f4 | Georgios D. Tsoukalas | service_token=self.service_token,
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94 | 36cae9f4 | Georgios D. Tsoukalas | astakosclient_poolsize=self.astakosclient_poolsize,
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95 | 36cae9f4 | Georgios D. Tsoukalas | free_versioning=self.free_versioning,
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96 | 36cae9f4 | Georgios D. Tsoukalas | public_url_security=self.public_url_security,
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97 | 36cae9f4 | Georgios D. Tsoukalas | public_url_alphabet=self.public_url_alphabet,
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98 | 36cae9f4 | Georgios D. Tsoukalas | account_quota_policy=self.account_quota_policy,
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99 | 36cae9f4 | Georgios D. Tsoukalas | container_quota_policy=self.container_quota_policy,
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100 | 36cae9f4 | Georgios D. Tsoukalas | container_versioning_policy=self.container_versioning_policy)
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101 | edb7875c | Christos Stavrakakis | |
102 | edb7875c | Christos Stavrakakis | backend._real_close = backend.close |
103 | edb7875c | Christos Stavrakakis | backend.close = instancemethod(_pooled_backend_close, backend, |
104 | edb7875c | Christos Stavrakakis | type(backend))
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105 | edb7875c | Christos Stavrakakis | backend._pool = self
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106 | edb7875c | Christos Stavrakakis | backend._use_count = USAGE_LIMIT |
107 | b0b87c56 | Stratos Psomadakis | backend.messages = [] |
108 | edb7875c | Christos Stavrakakis | return backend
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109 | edb7875c | Christos Stavrakakis | |
110 | edb7875c | Christos Stavrakakis | def _pool_verify(self, backend): |
111 | edb7875c | Christos Stavrakakis | wrapper = backend.wrapper |
112 | edb7875c | Christos Stavrakakis | conn = wrapper.conn |
113 | edb7875c | Christos Stavrakakis | if conn.closed:
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114 | edb7875c | Christos Stavrakakis | return False |
115 | edb7875c | Christos Stavrakakis | |
116 | edb7875c | Christos Stavrakakis | if conn.in_transaction():
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117 | edb7875c | Christos Stavrakakis | conn.close() |
118 | edb7875c | Christos Stavrakakis | return False |
119 | edb7875c | Christos Stavrakakis | |
120 | edb7875c | Christos Stavrakakis | try:
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121 | edb7875c | Christos Stavrakakis | fd = conn.connection.connection.fileno() |
122 | aa00e32c | Georgios D. Tsoukalas | except AttributeError: |
123 | aa00e32c | Georgios D. Tsoukalas | # probably sqlite, assume success
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124 | aa00e32c | Georgios D. Tsoukalas | pass
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125 | aa00e32c | Georgios D. Tsoukalas | else:
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126 | aa00e32c | Georgios D. Tsoukalas | try:
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127 | aa00e32c | Georgios D. Tsoukalas | r, w, x = select([fd], (), (), 0)
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128 | aa00e32c | Georgios D. Tsoukalas | if r:
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129 | aa00e32c | Georgios D. Tsoukalas | conn.close() |
130 | aa00e32c | Georgios D. Tsoukalas | return False |
131 | aa00e32c | Georgios D. Tsoukalas | except:
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132 | aa00e32c | Georgios D. Tsoukalas | print_exc() |
133 | edb7875c | Christos Stavrakakis | return False |
134 | edb7875c | Christos Stavrakakis | |
135 | edb7875c | Christos Stavrakakis | return True |
136 | edb7875c | Christos Stavrakakis | |
137 | edb7875c | Christos Stavrakakis | def _pool_cleanup(self, backend): |
138 | edb7875c | Christos Stavrakakis | c = backend._use_count - 1
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139 | edb7875c | Christos Stavrakakis | if c < 0: |
140 | edb7875c | Christos Stavrakakis | backend._real_close() |
141 | edb7875c | Christos Stavrakakis | return True |
142 | edb7875c | Christos Stavrakakis | |
143 | edb7875c | Christos Stavrakakis | backend._use_count = c |
144 | edb7875c | Christos Stavrakakis | wrapper = backend.wrapper |
145 | edb7875c | Christos Stavrakakis | if wrapper.trans is not None: |
146 | edb7875c | Christos Stavrakakis | conn = wrapper.conn |
147 | edb7875c | Christos Stavrakakis | if conn.closed:
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148 | edb7875c | Christos Stavrakakis | wrapper.trans = None
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149 | edb7875c | Christos Stavrakakis | else:
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150 | edb7875c | Christos Stavrakakis | wrapper.rollback() |
151 | b0b87c56 | Stratos Psomadakis | backend.messages = [] |
152 | edb7875c | Christos Stavrakakis | return False |
153 | edb7875c | Christos Stavrakakis | |
154 | de8fb87d | Sofia Papagiannaki | def shutdown(self): |
155 | de8fb87d | Sofia Papagiannaki | while True: |
156 | de8fb87d | Sofia Papagiannaki | backend = self.pool_get(create=False) |
157 | de8fb87d | Sofia Papagiannaki | if backend is None: |
158 | de8fb87d | Sofia Papagiannaki | break
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159 | de8fb87d | Sofia Papagiannaki | self.pool_put(None) |
160 | de8fb87d | Sofia Papagiannaki | backend._real_close() |
161 | de8fb87d | Sofia Papagiannaki | |
162 | edb7875c | Christos Stavrakakis | |
163 | edb7875c | Christos Stavrakakis | def _pooled_backend_close(backend): |
164 | edb7875c | Christos Stavrakakis | backend._pool.pool_put(backend) |