root / snf-pithos-backend / pithos / backends / util.py @ 4a105ce2
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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 | edb7875c | Christos Stavrakakis | from synnefo.lib.pool 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 | b1dadd0e | Sofia Papagiannaki | queue_module=None, queue_hosts=None, |
47 | 7f1f0464 | Georgios D. Tsoukalas | queue_exchange=None, free_versioning=True, |
48 | 1f3f907f | Sofia Papagiannaki | quotaholder_enabled=True,
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49 | 3173699c | Sofia Papagiannaki | quotaholder_url=None, quotaholder_token=None, |
50 | b336e6fa | Georgios D. Tsoukalas | quotaholder_client_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 | 56f3c759 | Sofia Papagiannaki | public_url_alphabet=None):
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54 | edb7875c | Christos Stavrakakis | super(PithosBackendPool, self).__init__(size=size) |
55 | edb7875c | Christos Stavrakakis | self.db_module = db_module
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56 | edb7875c | Christos Stavrakakis | self.db_connection = db_connection
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57 | edb7875c | Christos Stavrakakis | self.block_module = block_module
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58 | edb7875c | Christos Stavrakakis | self.block_path = block_path
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59 | edb7875c | Christos Stavrakakis | self.block_umask = block_umask
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60 | edb7875c | Christos Stavrakakis | self.queue_module = queue_module
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61 | 47462eda | Filippos Giannakos | self.block_params = block_params
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62 | b1dadd0e | Sofia Papagiannaki | self.queue_hosts = queue_hosts
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63 | b1dadd0e | Sofia Papagiannaki | self.queue_exchange = queue_exchange
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64 | 1f3f907f | Sofia Papagiannaki | self.quotaholder_enabled = quotaholder_enabled
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65 | 3173699c | Sofia Papagiannaki | self.quotaholder_url = quotaholder_url
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66 | 3173699c | Sofia Papagiannaki | self.quotaholder_token = quotaholder_token
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67 | b336e6fa | Georgios D. Tsoukalas | self.quotaholder_client_poolsize = quotaholder_client_poolsize
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68 | b1dadd0e | Sofia Papagiannaki | self.free_versioning = free_versioning
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69 | 4a105ce2 | Sofia Papagiannaki | self.public_url_security=public_url_security
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70 | 56f3c759 | Sofia Papagiannaki | self.public_url_alphabet=public_url_alphabet
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71 | edb7875c | Christos Stavrakakis | |
72 | edb7875c | Christos Stavrakakis | def _pool_create(self): |
73 | b336e6fa | Georgios D. Tsoukalas | backend = connect_backend( |
74 | b336e6fa | Georgios D. Tsoukalas | db_module=self.db_module,
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75 | b336e6fa | Georgios D. Tsoukalas | db_connection=self.db_connection,
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76 | b336e6fa | Georgios D. Tsoukalas | block_module=self.block_module,
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77 | b336e6fa | Georgios D. Tsoukalas | block_path=self.block_path,
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78 | b336e6fa | Georgios D. Tsoukalas | block_umask=self.block_umask,
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79 | b336e6fa | Georgios D. Tsoukalas | queue_module=self.queue_module,
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80 | b336e6fa | Georgios D. Tsoukalas | block_params=self.block_params,
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81 | b336e6fa | Georgios D. Tsoukalas | queue_hosts=self.queue_hosts,
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82 | b336e6fa | Georgios D. Tsoukalas | queue_exchange=self.queue_exchange,
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83 | b336e6fa | Georgios D. Tsoukalas | quotaholder_enabled=self.quotaholder_enabled,
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84 | b336e6fa | Georgios D. Tsoukalas | quotaholder_url=self.quotaholder_url,
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85 | b336e6fa | Georgios D. Tsoukalas | quotaholder_token=self.quotaholder_token,
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86 | b336e6fa | Georgios D. Tsoukalas | quotaholder_client_poolsize=self.quotaholder_client_poolsize,
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87 | 56f3c759 | Sofia Papagiannaki | free_versioning=self.free_versioning,
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88 | 4a105ce2 | Sofia Papagiannaki | public_url_security=self.public_url_security,
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89 | 56f3c759 | Sofia Papagiannaki | public_url_alphabet=self.public_url_alphabet)
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90 | edb7875c | Christos Stavrakakis | |
91 | edb7875c | Christos Stavrakakis | backend._real_close = backend.close |
92 | edb7875c | Christos Stavrakakis | backend.close = instancemethod(_pooled_backend_close, backend, |
93 | edb7875c | Christos Stavrakakis | type(backend))
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94 | edb7875c | Christos Stavrakakis | backend._pool = self
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95 | edb7875c | Christos Stavrakakis | backend._use_count = USAGE_LIMIT |
96 | b0b87c56 | Stratos Psomadakis | backend.messages = [] |
97 | edb7875c | Christos Stavrakakis | return backend
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98 | edb7875c | Christos Stavrakakis | |
99 | edb7875c | Christos Stavrakakis | def _pool_verify(self, backend): |
100 | edb7875c | Christos Stavrakakis | wrapper = backend.wrapper |
101 | edb7875c | Christos Stavrakakis | conn = wrapper.conn |
102 | edb7875c | Christos Stavrakakis | if conn.closed:
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103 | edb7875c | Christos Stavrakakis | return False |
104 | edb7875c | Christos Stavrakakis | |
105 | edb7875c | Christos Stavrakakis | if conn.in_transaction():
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106 | edb7875c | Christos Stavrakakis | conn.close() |
107 | edb7875c | Christos Stavrakakis | return False |
108 | edb7875c | Christos Stavrakakis | |
109 | edb7875c | Christos Stavrakakis | try:
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110 | edb7875c | Christos Stavrakakis | fd = conn.connection.connection.fileno() |
111 | edb7875c | Christos Stavrakakis | r, w, x = select([fd], (), (), 0)
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112 | edb7875c | Christos Stavrakakis | if r:
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113 | edb7875c | Christos Stavrakakis | conn.close() |
114 | edb7875c | Christos Stavrakakis | return False |
115 | edb7875c | Christos Stavrakakis | except:
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116 | edb7875c | Christos Stavrakakis | print_exc() |
117 | edb7875c | Christos Stavrakakis | return False |
118 | edb7875c | Christos Stavrakakis | |
119 | edb7875c | Christos Stavrakakis | return True |
120 | edb7875c | Christos Stavrakakis | |
121 | edb7875c | Christos Stavrakakis | def _pool_cleanup(self, backend): |
122 | edb7875c | Christos Stavrakakis | c = backend._use_count - 1
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123 | edb7875c | Christos Stavrakakis | if c < 0: |
124 | edb7875c | Christos Stavrakakis | backend._real_close() |
125 | edb7875c | Christos Stavrakakis | return True |
126 | edb7875c | Christos Stavrakakis | |
127 | edb7875c | Christos Stavrakakis | backend._use_count = c |
128 | edb7875c | Christos Stavrakakis | wrapper = backend.wrapper |
129 | edb7875c | Christos Stavrakakis | if wrapper.trans is not None: |
130 | edb7875c | Christos Stavrakakis | conn = wrapper.conn |
131 | edb7875c | Christos Stavrakakis | if conn.closed:
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132 | edb7875c | Christos Stavrakakis | wrapper.trans = None
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133 | edb7875c | Christos Stavrakakis | else:
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134 | edb7875c | Christos Stavrakakis | wrapper.rollback() |
135 | b0b87c56 | Stratos Psomadakis | backend.messages = [] |
136 | edb7875c | Christos Stavrakakis | return False |
137 | edb7875c | Christos Stavrakakis | |
138 | edb7875c | Christos Stavrakakis | |
139 | edb7875c | Christos Stavrakakis | def _pooled_backend_close(backend): |
140 | edb7875c | Christos Stavrakakis | backend._pool.pool_put(backend) |