283 lines
9.4 KiB
Python
283 lines
9.4 KiB
Python
#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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""" This is a very crude version of "in-memory HBase", which implements just
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enough functionality of HappyBase API to support testing of our driver.
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"""
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import copy
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import re
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import six
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import ceilometer
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from ceilometer.i18n import _
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from ceilometer.openstack.common import log
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LOG = log.getLogger(__name__)
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class MTable(object):
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"""HappyBase.Table mock."""
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def __init__(self, name, families):
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self.name = name
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self.families = families
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self._rows_with_ts = {}
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def row(self, key, columns=None):
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if key not in self._rows_with_ts:
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return {}
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res = copy.copy(sorted(six.iteritems(
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self._rows_with_ts.get(key)))[-1][1])
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if columns:
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keys = res.keys()
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for key in keys:
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if key not in columns:
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res.pop(key)
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return res
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def rows(self, keys):
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return ((k, self.row(k)) for k in keys)
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def put(self, key, data, ts=None):
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# Note: Now we use 'timestamped' but only for one Resource table.
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# That's why we may put ts='0' in case when ts is None. If it is
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# needed to use 2 types of put in one table ts=0 cannot be used.
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if ts is None:
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ts = "0"
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if key not in self._rows_with_ts:
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self._rows_with_ts[key] = {ts: data}
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else:
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if ts in self._rows_with_ts[key]:
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self._rows_with_ts[key][ts].update(data)
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else:
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self._rows_with_ts[key].update({ts: data})
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def delete(self, key):
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del self._rows_with_ts[key]
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def _get_latest_dict(self, row):
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# The idea here is to return latest versions of columns.
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# In _rows_with_ts we store {row: {ts_1: {data}, ts_2: {data}}}.
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# res will contain a list of tuples [(ts_1, {data}), (ts_2, {data})]
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# sorted by ts, i.e. in this list ts_2 is the most latest.
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# To get result as HBase provides we should iterate in reverse order
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# and get from "latest" data only key-values that are not in newer data
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data = {}
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for i in sorted(six.iteritems(self._rows_with_ts[row])):
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data.update(i[1])
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return data
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def scan(self, filter=None, columns=None, row_start=None, row_stop=None,
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limit=None):
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columns = columns or []
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sorted_keys = sorted(self._rows_with_ts)
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# copy data between row_start and row_stop into a dict
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rows = {}
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for row in sorted_keys:
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if row_start and row < row_start:
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continue
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if row_stop and row > row_stop:
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break
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rows[row] = self._get_latest_dict(row)
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if columns:
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ret = {}
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for row, data in six.iteritems(rows):
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for key in data:
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if key in columns:
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ret[row] = data
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rows = ret
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if filter:
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# TODO(jdanjou): we should really parse this properly,
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# but at the moment we are only going to support AND here
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filters = filter.split('AND')
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for f in filters:
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# Extract filter name and its arguments
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g = re.search("(.*)\((.*),?\)", f)
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fname = g.group(1).strip()
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fargs = [s.strip().replace('\'', '')
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for s in g.group(2).split(',')]
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m = getattr(self, fname)
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if callable(m):
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# overwrite rows for filtering to take effect
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# in case of multiple filters
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rows = m(fargs, rows)
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else:
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raise ceilometer.NotImplementedError(
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"%s filter is not implemented, "
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"you may want to add it!")
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for k in sorted(rows)[:limit]:
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yield k, rows[k]
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@staticmethod
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def SingleColumnValueFilter(args, rows):
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"""This is filter for testing "in-memory HBase".
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This method is called from scan() when 'SingleColumnValueFilter'
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is found in the 'filter' argument.
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"""
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op = args[2]
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column = "%s:%s" % (args[0], args[1])
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value = args[3]
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if value.startswith('binary:'):
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value = value[7:]
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r = {}
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for row in rows:
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data = rows[row]
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if op == '=':
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if column in data and data[column] == value:
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r[row] = data
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elif op == '<':
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if column in data and data[column] < value:
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r[row] = data
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elif op == '<=':
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if column in data and data[column] <= value:
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r[row] = data
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elif op == '>':
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if column in data and data[column] > value:
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r[row] = data
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elif op == '>=':
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if column in data and data[column] >= value:
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r[row] = data
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elif op == '!=':
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if column in data and data[column] != value:
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r[row] = data
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return r
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@staticmethod
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def ColumnPrefixFilter(args, rows):
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"""This is filter for testing "in-memory HBase".
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This method is called from scan() when 'ColumnPrefixFilter' is found
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in the 'filter' argument.
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:param args: a list of filter arguments, contain prefix of column
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:param rows: a dict of row prefixes for filtering
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"""
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value = args[0]
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column = 'f:' + value
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r = {}
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for row, data in rows.items():
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column_dict = {}
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for key in data:
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if key.startswith(column):
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column_dict[key] = data[key]
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r[row] = column_dict
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return r
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@staticmethod
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def RowFilter(args, rows):
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"""This is filter for testing "in-memory HBase".
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This method is called from scan() when 'RowFilter' is found in the
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'filter' argument.
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:param args: a list of filter arguments, it contains operator and
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sought string
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:param rows: a dict of rows which are filtered
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"""
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op = args[0]
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value = args[1]
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if value.startswith('regexstring:'):
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value = value[len('regexstring:'):]
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r = {}
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for row, data in rows.items():
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try:
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g = re.search(value, row).group()
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if op == '=':
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if g == row:
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r[row] = data
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else:
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raise ceilometer.NotImplementedError(
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"In-memory "
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"RowFilter doesn't support "
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"the %s operation yet" % op)
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except AttributeError:
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pass
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return r
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@staticmethod
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def QualifierFilter(args, rows):
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"""This is filter for testing "in-memory HBase".
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This method is called from scan() when 'QualifierFilter' is found in
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the 'filter' argument
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"""
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op = args[0]
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value = args[1]
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is_regex = False
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if value.startswith('binaryprefix:'):
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value = value[len('binaryprefix:'):]
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if value.startswith('regexstring:'):
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value = value[len('regexstring:'):]
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is_regex = True
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column = 'f:' + value
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r = {}
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for row in rows:
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data = rows[row]
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r_data = {}
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for key in data:
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if ((op == '=' and key.startswith(column)) or
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(op == '>=' and key >= column) or
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(op == '<=' and key <= column) or
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(op == '>' and key > column) or
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(op == '<' and key < column) or
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(is_regex and re.search(value, key))):
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r_data[key] = data[key]
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else:
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raise ceilometer.NotImplementedError(
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"In-memory QualifierFilter "
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"doesn't support the %s "
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"operation yet" % op)
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if r_data:
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r[row] = r_data
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return r
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class MConnectionPool(object):
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def __init__(self):
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self.conn = MConnection()
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def connection(self):
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return self.conn
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class MConnection(object):
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"""HappyBase.Connection mock."""
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def __init__(self):
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self.tables = {}
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def __enter__(self, *args, **kwargs):
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return self
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def __exit__(self, exc_type, exc_val, exc_tb):
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pass
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@staticmethod
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def open():
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LOG.debug(_("Opening in-memory HBase connection"))
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def create_table(self, n, families=None):
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families = families or {}
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if n in self.tables:
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return self.tables[n]
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t = MTable(n, families)
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self.tables[n] = t
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return t
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def delete_table(self, name, use_prefix=True):
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del self.tables[name]
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def table(self, name):
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return self.create_table(name)
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