152 lines
4.8 KiB
Python
Executable File
152 lines
4.8 KiB
Python
Executable File
###
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# Copyright 2008-2011 Diamond Light Source Ltd.
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# This file is part of Diffcalc.
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#
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# Diffcalc is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# Diffcalc is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with Diffcalc. If not, see <http://www.gnu.org/licenses/>.
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###
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from __future__ import with_statement
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import os, glob
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from diffcalc.ub.calcstate import UBCalcStateEncoder
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import datetime
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try:
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import json
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except ImportError:
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import simplejson as json
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def is_writable(directory):
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"""Return true if the file is writable from the current user
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"""
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probe = os.path.join(directory, "probe")
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try:
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open(probe, 'w')
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except IOError:
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return False
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else:
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os.remove(probe)
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return True
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def check_directory_appropriate(directory):
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if not os.path.exists(directory):
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raise IOError("'%s' does not exist")
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if not os.path.isdir(directory):
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raise IOError("'%s' is not a directory")
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if not is_writable(directory):
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raise IOError("'%s' is not writable")
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class UBCalculationJSONPersister(object):
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def __init__(self, directory):
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check_directory_appropriate(directory)
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self.directory = directory
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self.description = directory
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def filepath(self, name):
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return os.path.join(self.directory, name + '.json')
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def save(self, state, name):
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# FORMAT = '%Y-%m-%d %H:%M:%S'
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# time_string = datetime.datetime.strftime(datetime.datetime.now(), FORMAT)
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with open(self.filepath(name), 'w') as f:
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json.dump(state, f, indent=4, cls=UBCalcStateEncoder)
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def load(self, name):
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with open(self.filepath(name), 'r') as f:
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return json.load(f)
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def list(self): # @ReservedAssignment
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files = self._get_save_files()
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return [os.path.basename(f + '.json').split('.json')[0] for f in files]
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def list_metadata(self):
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metadata = []
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for f in self._get_save_files():
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dt = datetime.datetime.fromtimestamp(os.path.getmtime(f))
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metadata.append(dt.strftime('%d %b %Y (%H:%M)'))
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return metadata
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def _get_save_files(self):
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files = filter(os.path.isfile, glob.glob(os.path.join(self.directory, '*.json')))
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files.sort(key=lambda x: os.path.getmtime(x))
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files.reverse()
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return files
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def remove(self, name):
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os.remove(self.filepath(name))
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class UBCalculationPersister(object):
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"""Attempts to the use the gda's database to store ub calculation state
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"""
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def __init__(self):
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try:
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from uk.ac.diamond.daq.persistence.jythonshelf import LocalJythonShelfManager
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from uk.ac.diamond.daq.persistence.jythonshelf.LocalDatabase import \
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LocalDatabaseException
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self.shelf = LocalJythonShelfManager.getLocalObjectShelf(
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'diffcalc.ub')
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except ImportError, e:
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print ("!!! UBCalculationPersister could not import the gda database "
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"code: " + repr(e))
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self.shelf = None
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except LocalDatabaseException, e:
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print ("UBCalculationPersister could not connect to the gda "
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"database: " + repr(e))
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self.shelf = None
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self.description = 'GDA sql database'
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def save(self, state, key):
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if self.shelf is not None:
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self.shelf[key] = state
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else:
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print "<<<no database available to save UB calculation>>>"
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def load(self, name):
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if self.shelf is not None:
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return self.shelf[name]
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else:
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raise IOError("Could not load UB calculation: no database available")
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def list(self): # @ReservedAssignment
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if self.shelf is not None:
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names = list(self.shelf.keys())
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names.sort()
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return names
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else:
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return []
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def remove(self, name):
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if self.shelf is not None:
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del self.shelf[name]
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else:
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raise IOError("Could not remove UB calculation: no database available")
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class UbCalculationNonPersister(UBCalculationPersister):
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"""
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A version of UBCalculationPersister that simply stores to a local dict
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rather than a database. Useful for testing.
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"""
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def __init__(self):
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self.shelf = dict()
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self.description = 'memory only'
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