root / snf-pithos-backend / pithos / backends / lib / hashfiler / archipelagomapper.py @ 32293ec0
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# Copyright 2013 GRNET S.A. All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or
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# without modification, are permitted provided that the following
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# conditions are met:
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#
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# 1. Redistributions of source code must retain the above
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# copyright notice, this list of conditions and the following
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# disclaimer.
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#
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# 2. Redistributions in binary form must reproduce the above
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# copyright notice, this list of conditions and the following
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# disclaimer in the documentation and/or other materials
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# provided with the distribution.
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#
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# THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS
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# OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR
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# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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# USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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# POSSIBILITY OF SUCH DAMAGE.
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#
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# The views and conclusions contained in the software and
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# documentation are those of the authors and should not be
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# interpreted as representing official policies, either expressed
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# or implied, of GRNET S.A.
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from binascii import hexlify |
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import os, re |
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import ctypes |
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from context_archipelago import ArchipelagoObject |
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from archipelago.common import ( |
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Request, |
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xseg_reply_info, |
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xseg_reply_map, |
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xseg_reply_map_scatterlist, |
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string_at, |
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) |
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from pithos.workers import ( |
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glue, |
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monkey, |
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) |
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monkey.patch_Request() |
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from pithos.api.settings import BACKEND_ARCHIPELAGO_CONF |
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class ArchipelagoMapper(object): |
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"""Mapper.
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Required constructor parameters: namelen.
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"""
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namelen = None
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def __init__(self, **params): |
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self.params = params
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self.namelen = params['namelen'] |
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ioctx_pool = glue.WorkerGlue().ioctx_pool |
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cfg = {} |
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bcfg = open(BACKEND_ARCHIPELAGO_CONF).read()
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cfg['blockerm'] = re.search('\'blockerm_port\'\s*:\s*\d+', |
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bcfg).group(0).split(':')[1] |
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cfg['mapperd'] = re.search('\'mapper_port\'\s*:\s*\d+', |
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bcfg).group(0).split(':')[1] |
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self.ioctx_pool = ioctx_pool
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self.dst_port = int(cfg['blockerm']) |
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self.mapperd_port = int(cfg['mapperd']) |
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def _get_rear_map(self, maphash, create=0): |
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name = hexlify(maphash) |
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return ArchipelagoObject(name, self.ioctx_pool, self.dst_port, create) |
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def _check_rear_map(self, maphash): |
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name = hexlify(maphash) |
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ioctx = self.ioctx_pool.pool_get()
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req = Request.get_info_request(ioctx, self.dst_port, name)
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req.submit() |
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req.wait() |
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ret = req.success() |
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req.put() |
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self.ioctx_pool.pool_put(ioctx)
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if ret:
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return True |
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else:
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return False |
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def map_retr(self, maphash, blkoff=0, nr=100000000000000): |
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"""Return as a list, part of the hashes map of an object
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at the given block offset.
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By default, return the whole hashes map.
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"""
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namelen = self.namelen
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hashes = () |
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ioctx = self.ioctx_pool.pool_get()
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req = Request.get_info_request(ioctx, self.dst_port,
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hexlify(maphash)) |
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req.submit() |
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req.wait() |
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ret = req.success() |
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if ret:
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info = req.get_data(_type=xseg_reply_info) |
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size = int(info.contents.size)
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req.put() |
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else:
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req.put() |
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self.ioctx_pool.pool_put(ioctx)
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raise RuntimeError("Hashmap '%s' doesn't exists" % hexlify(maphash)) |
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req = Request.get_read_request(ioctx, self.dst_port,
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hexlify(maphash), size = size) |
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req.submit() |
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req.wait() |
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ret = req.success() |
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if ret:
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data = string_at(req.get_data(),size) |
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req.put() |
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self.ioctx_pool.pool_put(ioctx)
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for idx in xrange(0,len(data),namelen): |
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hashes = hashes + (data[idx:idx+namelen],) |
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hashes = list(hashes)
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else:
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req.put() |
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self.ioctx_pool.pool_put(ioctx)
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raise RuntimeError("Hashmap '%s' doesn't exists" % hexlify(maphash)) |
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return hashes
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def map_retr_archipelago(self, maphash, size): |
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"""Retrieve Archipelago mapfile"""
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ioctx = self.ioctx_pool.pool_get()
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maphash = maphash.split("archip:")[1] |
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req = Request.get_mapr_request(ioctx, self.mapperd_port, maphash,
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offset=0, size=size)
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req.submit() |
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req.wait() |
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ret = req.success() |
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if ret:
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data = req.get_data(xseg_reply_map) |
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Segsarray = xseg_reply_map_scatterlist * data.contents.cnt |
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segs = Segsarray.from_address(ctypes.addressof(data.contents.segs)) |
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req.put() |
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else:
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req.put() |
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self.ioctx_pool.pool_put(ioctx)
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raise Exception("Could not retrieve Archipelago mapfile.") |
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self.ioctx_pool.pool_put(ioctx)
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return [string_at(segs[idx].target, segs[idx].targetlen) for idx in xrange(len(segs))] |
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def map_stor(self, maphash, hashes=(), blkoff=0, create=1): |
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"""Store hashes in the given hashes map."""
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namelen = self.namelen
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if self._check_rear_map(maphash): |
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return
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with self._get_rear_map(maphash, 1) as rmap: |
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rmap.sync_write_chunks(namelen, blkoff, hashes, None)
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