root / snf-cyclades-app / synnefo / logic / rapi_pool.py @ 3f339d85
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1 | 3524241a | Christos Stavrakakis | # Copyright 2011-2012 GRNET S.A. All rights reserved.
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2 | 3524241a | Christos Stavrakakis | #
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3 | 3524241a | Christos Stavrakakis | # Redistribution and use in source and binary forms, with or
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4 | 3524241a | Christos Stavrakakis | # without modification, are permitted provided that the following
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5 | 3524241a | Christos Stavrakakis | # conditions are met:
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6 | 3524241a | Christos Stavrakakis | #
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7 | 3524241a | Christos Stavrakakis | # 1. Redistributions of source code must retain the above
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8 | 3524241a | Christos Stavrakakis | # copyright notice, this list of conditions and the following
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9 | 3524241a | Christos Stavrakakis | # disclaimer.
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10 | 3524241a | Christos Stavrakakis | #
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11 | 3524241a | Christos Stavrakakis | # 2. Redistributions in binary form must reproduce the above
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12 | 3524241a | Christos Stavrakakis | # copyright notice, this list of conditions and the following
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13 | 3524241a | Christos Stavrakakis | # disclaimer in the documentation and/or other materials
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14 | 3524241a | Christos Stavrakakis | # provided with the distribution.
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15 | 3524241a | Christos Stavrakakis | #
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16 | 3524241a | Christos Stavrakakis | # THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS
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17 | 3524241a | Christos Stavrakakis | # OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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18 | 3524241a | Christos Stavrakakis | # WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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19 | 3524241a | Christos Stavrakakis | # PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR
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20 | 3524241a | Christos Stavrakakis | # CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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21 | 3524241a | Christos Stavrakakis | # SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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22 | 3524241a | Christos Stavrakakis | # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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23 | 3524241a | Christos Stavrakakis | # USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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24 | 3524241a | Christos Stavrakakis | # AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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25 | 3524241a | Christos Stavrakakis | # LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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26 | 3524241a | Christos Stavrakakis | # ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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27 | 3524241a | Christos Stavrakakis | # POSSIBILITY OF SUCH DAMAGE.
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28 | 3524241a | Christos Stavrakakis | #
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29 | 3524241a | Christos Stavrakakis | # The views and conclusions contained in the software and
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30 | 3524241a | Christos Stavrakakis | # documentation are those of the authors and should not be
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31 | 3524241a | Christos Stavrakakis | # interpreted as representing official policies, either expressed
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32 | 3524241a | Christos Stavrakakis | # or implied, of GRNET S.A.
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33 | 3524241a | Christos Stavrakakis | |
34 | 1a736ca8 | Christos Stavrakakis | from objpool import ObjectPool |
35 | 3524241a | Christos Stavrakakis | from synnefo.logic.rapi import GanetiRapiClient |
36 | 3524241a | Christos Stavrakakis | |
37 | 3524241a | Christos Stavrakakis | from logging import getLogger |
38 | 3524241a | Christos Stavrakakis | log = getLogger(__name__) |
39 | 3524241a | Christos Stavrakakis | |
40 | 3524241a | Christos Stavrakakis | _pools = {} |
41 | ffa7f6f6 | Christos Stavrakakis | _hashes = {} |
42 | 3524241a | Christos Stavrakakis | pool_size = 8
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43 | 3524241a | Christos Stavrakakis | |
44 | 3524241a | Christos Stavrakakis | |
45 | 3524241a | Christos Stavrakakis | class GanetiRapiClientPool(ObjectPool): |
46 | 3524241a | Christos Stavrakakis | """Pool of Ganeti RAPI Clients."""
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47 | 3524241a | Christos Stavrakakis | |
48 | 3524241a | Christos Stavrakakis | def __init__(self, host, port, user, passwd, size=None): |
49 | cc92b70f | Christos Stavrakakis | log.debug("INIT: Initializing pool of size %d, host %s,"
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50 | 3524241a | Christos Stavrakakis | " port %d, user %s", size, host, port, user)
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51 | 3524241a | Christos Stavrakakis | ObjectPool.__init__(self, size=size)
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52 | 3524241a | Christos Stavrakakis | self.host = host
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53 | 3524241a | Christos Stavrakakis | self.port = port
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54 | 3524241a | Christos Stavrakakis | self.user = user
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55 | 3524241a | Christos Stavrakakis | self.passwd = passwd
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56 | 3524241a | Christos Stavrakakis | |
57 | 3524241a | Christos Stavrakakis | def _pool_create(self): |
58 | 3524241a | Christos Stavrakakis | log.debug("CREATE: Creating new client from pool %r", self) |
59 | 3524241a | Christos Stavrakakis | client = GanetiRapiClient(self.host, self.port, self.user, self.passwd) |
60 | 3524241a | Christos Stavrakakis | client._pool = self
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61 | 3524241a | Christos Stavrakakis | return client
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62 | 3524241a | Christos Stavrakakis | |
63 | 3524241a | Christos Stavrakakis | def _pool_verify(self, client): |
64 | 3524241a | Christos Stavrakakis | return True |
65 | 3524241a | Christos Stavrakakis | |
66 | 3524241a | Christos Stavrakakis | def _pool_cleanup(self, conn): |
67 | 3524241a | Christos Stavrakakis | return False |
68 | 3524241a | Christos Stavrakakis | |
69 | 3524241a | Christos Stavrakakis | |
70 | 3524241a | Christos Stavrakakis | def get_rapi_client(backend_id, backend_hash, host, port, user, passwd): |
71 | 3524241a | Christos Stavrakakis | """Get a ganeti RAPI client from pool."""
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72 | 3524241a | Christos Stavrakakis | log.debug("GET: Getting RAPI client")
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73 | 3524241a | Christos Stavrakakis | m = "%s cannot be None"
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74 | 3524241a | Christos Stavrakakis | if host is None: |
75 | 3524241a | Christos Stavrakakis | raise ValueError(m % "host") |
76 | 3524241a | Christos Stavrakakis | if port is None: |
77 | 3524241a | Christos Stavrakakis | raise ValueError(m % "port") |
78 | 3524241a | Christos Stavrakakis | |
79 | 3524241a | Christos Stavrakakis | # does the pool need to be created?
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80 | 3524241a | Christos Stavrakakis | if backend_hash not in _pools: |
81 | 3524241a | Christos Stavrakakis | log.debug("GET: No Pool. Creating new for host %s", host)
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82 | 3524241a | Christos Stavrakakis | pool = GanetiRapiClientPool(host, port, user, passwd, pool_size) |
83 | 3524241a | Christos Stavrakakis | _pools[backend_hash] = pool |
84 | ffa7f6f6 | Christos Stavrakakis | # Delete Pool for old backend_hash
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85 | ffa7f6f6 | Christos Stavrakakis | if backend_id in _hashes: |
86 | ffa7f6f6 | Christos Stavrakakis | del _pools[_hashes[backend_id]]
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87 | ffa7f6f6 | Christos Stavrakakis | _hashes[backend_id] = backend_hash |
88 | 3524241a | Christos Stavrakakis | |
89 | 3524241a | Christos Stavrakakis | obj = _pools[backend_hash].pool_get() |
90 | 3524241a | Christos Stavrakakis | log.debug("GET: Got object %r from pool", obj)
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91 | 3524241a | Christos Stavrakakis | return obj
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92 | 3524241a | Christos Stavrakakis | |
93 | 3524241a | Christos Stavrakakis | |
94 | 3524241a | Christos Stavrakakis | def put_rapi_client(client): |
95 | 3524241a | Christos Stavrakakis | pool = client._pool |
96 | 3524241a | Christos Stavrakakis | log.debug("PUT: putting client %r back to pool %r", client, pool)
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97 | 3524241a | Christos Stavrakakis | if pool is None: |
98 | 3524241a | Christos Stavrakakis | log.debug("PUT: client %r does not have a pool", client)
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99 | 3524241a | Christos Stavrakakis | return
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100 | 3524241a | Christos Stavrakakis | pool.pool_put(client) |