openstack/aodh
Code Issues Proposed changes
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b938f10c320ec5a8c110299a4146334a40c6a773
aodh/ceilometer/storage/impl_hbase.py
Nadya Privalova b938f10c32 Make entities (Resource, User, Project) able to store lists 
When one Resource contains several meters we should store all of them.
The same is true about User, Project and Resource regarding sources.
To make it possible it is needed to change the way we store data in Hbase.

Now Resource, User and Project may contain several sources. Besides, Resource may contain several meters.
To store all of them we use ColumnFamily f and columns m_meters and s_sources.
All meters stored as JSON-ed list.
E.g.
resource_1: {f: {meters: [meter1, meter2, meter3]} }
The same for users and projects:
user_1: {f: [sources: [source_1, source_2]}

We cannot update these lists safely.

In this commit m_meters and s_sources are changed to m_{unique_meter_structure} and s_{unique_source_name}.
So we getting rid of 'lists' and may use safe put() method.
All meters in Resource and sources in User, Project, Resource are
stored with stub value=1 to make filtering simpler.

New ColumnFamilies are not introdused here because CF is a 'namespace' and make sence in case when
there is a lot of requests only for this CF. But it's not the case for Ceilometer: each request may
contain _id field or metadata filter. It's better to store all this info in one CF.

Closes bug 1288284

Change-Id: I5814202e3d59fd29f96c8734e445367f766e6a4a
2014-04-15 17:35:56 +04:00

1001 lines
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Python
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# -*- encoding: utf-8 -*-
#
# Copyright © 2012, 2013 Dell Inc.
#
# Author: Stas Maksimov <Stanislav_M@dell.com>
# Author: Shengjie Min <Shengjie_Min@dell.com>
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
"""HBase storage backend
"""
import copy
import datetime
import hashlib
import itertools
import json
import os
import re
import six.moves.urllib.parse as urlparse
import bson.json_util
import happybase
from ceilometer.openstack.common.gettextutils import _ # noqa
from ceilometer.openstack.common import log
from ceilometer.openstack.common import network_utils
from ceilometer.openstack.common import timeutils
from ceilometer import storage
from ceilometer.storage import base
from ceilometer.storage import models
from ceilometer import utils
LOG = log.getLogger(__name__)
class HBaseStorage(base.StorageEngine):
"""Put the data into a HBase database
Collections:
- user
- row_key: user_id
- Column Families:
f: contains all sources with 's' prefix
- project
- row_key: project_id
- Column Families:
f: contains all sources with 's' prefix
- meter (describes sample actually)
- row-key: consists of reversed timestamp, meter and an md5 of
user+resource+project for purposes of uniqueness
- Column Families:
f: contains the following qualifiers:
-counter_name : <name of counter>
-counter_type : <type of counter>
-counter_unit : <unit of counter>
-counter_volume : <volume of counter>
-message: <raw incoming data>
-message_id: <id of message>
-message_signature: <signature of message>
-resource_metadata: raw metadata for corresponding resource
of the meter
-project_id: <id of project>
-resource_id: <id of resource>
-user_id: <id of user>
-recorded_at: <datetime when sample has been recorded (utc.now)>
-flattened metadata with prefix r_metadata. e.g.
f:r_metadata.display_name or f:r_metadata.tag
-rts: <reversed timestamp of entry>
-timestamp: <meter's timestamp (came from message)>
-source for meter with prefix 's'
- resource
- row_key: uuid of resource
- Column Families:
f: contains the following qualifiers:
-resource_metadata: raw metadata for corresponding resource
-project_id: <id of project>
-resource_id: <id of resource>
-user_id: <id of user>
-flattened metadata with prefix r_metadata. e.g.
f:r_metadata.display_name or f:r_metadata.tag
-sources for all corresponding meters with prefix 's'
-all meters for this resource in format
"%s!%s!%s+%s" % (counter_name, counter_type, counter_unit,
source)
- alarm
- row_key: uuid of alarm
- Column Families:
f: contains the raw incoming alarm data
- alarm_h
- row_key: uuid of alarm + "_" + reversed timestamp
- Column Families:
f: raw incoming alarm_history data. Timestamp becomes now()
if not determined
"""
@staticmethod
def get_connection(conf):
"""Return a Connection instance based on the configuration settings.
"""
return Connection(conf)
AVAILABLE_CAPABILITIES = {
'meters': {'query': {'simple': True,
'metadata': True}},
'resources': {'query': {'simple': True,
'metadata': True}},
'samples': {'query': {'simple': True,
'metadata': True}},
'statistics': {'query': {'simple': True,
'metadata': True},
'aggregation': {'standard': True}},
}
class Connection(base.Connection):
"""HBase connection.
"""
_memory_instance = None
PROJECT_TABLE = "project"
USER_TABLE = "user"
RESOURCE_TABLE = "resource"
METER_TABLE = "meter"
ALARM_TABLE = "alarm"
ALARM_HISTORY_TABLE = "alarm_h"
def __init__(self, conf):
"""Hbase Connection Initialization."""
super(Connection, self).__init__(conf, AVAILABLE_CAPABILITIES)
opts = self._parse_connection_url(conf.database.connection)
if opts['host'] == '__test__':
url = os.environ.get('CEILOMETER_TEST_HBASE_URL')
if url:
# Reparse URL, but from the env variable now
opts = self._parse_connection_url(url)
self.conn_pool = self._get_connection_pool(opts)
else:
# This is a in-memory usage for unit tests
if Connection._memory_instance is None:
LOG.debug(_('Creating a new in-memory HBase '
'Connection object'))
Connection._memory_instance = MConnectionPool()
self.conn_pool = Connection._memory_instance
else:
self.conn_pool = self._get_connection_pool(opts)
def upgrade(self):
with self.conn_pool.connection() as conn:
conn.create_table(self.PROJECT_TABLE, {'f': dict(max_versions=1)})
conn.create_table(self.USER_TABLE, {'f': dict(max_versions=1)})
conn.create_table(self.RESOURCE_TABLE, {'f': dict(max_versions=1)})
conn.create_table(self.METER_TABLE, {'f': dict(max_versions=1)})
conn.create_table(self.ALARM_TABLE, {'f': dict()})
conn.create_table(self.ALARM_HISTORY_TABLE, {'f': dict()})
def clear(self):
LOG.debug(_('Dropping HBase schema...'))
with self.conn_pool.connection() as conn:
for table in [self.PROJECT_TABLE,
self.USER_TABLE,
self.RESOURCE_TABLE,
self.METER_TABLE,
self.ALARM_TABLE,
self.ALARM_HISTORY_TABLE]:
try:
conn.disable_table(table)
except Exception:
LOG.debug(_('Cannot disable table but ignoring error'))
try:
conn.delete_table(table)
except Exception:
LOG.debug(_('Cannot delete table but ignoring error'))
@staticmethod
def _get_connection_pool(conf):
"""Return a connection pool to the database.
.. note::
The tests use a subclass to override this and return an
in-memory connection pool.
"""
LOG.debug(_('connecting to HBase on %(host)s:%(port)s') % (
{'host': conf['host'], 'port': conf['port']}))
return happybase.ConnectionPool(size=100, host=conf['host'],
port=conf['port'],
table_prefix=conf['table_prefix'])
@staticmethod
def _parse_connection_url(url):
"""Parse connection parameters from a database url.
.. note::
HBase Thrift does not support authentication and there is no
database name, so we are not looking for these in the url.
"""
opts = {}
result = network_utils.urlsplit(url)
opts['table_prefix'] = urlparse.parse_qs(
result.query).get('table_prefix', [None])[0]
opts['dbtype'] = result.scheme
if ':' in result.netloc:
opts['host'], port = result.netloc.split(':')
else:
opts['host'] = result.netloc
port = 9090
opts['port'] = port and int(port) or 9090
return opts
def update_alarm(self, alarm):
"""Create an alarm.
:param alarm: The alarm to create. It is Alarm object, so we need to
call as_dict()
"""
_id = alarm.alarm_id
alarm_to_store = serialize_entry(alarm.as_dict())
with self.conn_pool.connection() as conn:
alarm_table = conn.table(self.ALARM_TABLE)
alarm_table.put(_id, alarm_to_store)
stored_alarm = deserialize_entry(alarm_table.row(_id))[0]
return models.Alarm(**stored_alarm)
create_alarm = update_alarm
def delete_alarm(self, alarm_id):
with self.conn_pool.connection() as conn:
alarm_table = conn.table(self.ALARM_TABLE)
alarm_table.delete(alarm_id)
def get_alarms(self, name=None, user=None,
project=None, enabled=None, alarm_id=None, pagination=None):
if pagination:
raise NotImplementedError('Pagination not implemented')
q = make_query(alarm_id=alarm_id, name=name, enabled=enabled,
user_id=user, project_id=project)
with self.conn_pool.connection() as conn:
alarm_table = conn.table(self.ALARM_TABLE)
gen = alarm_table.scan(filter=q)
for ignored, data in gen:
stored_alarm = deserialize_entry(data)[0]
yield models.Alarm(**stored_alarm)
def get_alarm_changes(self, alarm_id, on_behalf_of,
user=None, project=None, type=None,
start_timestamp=None, start_timestamp_op=None,
end_timestamp=None, end_timestamp_op=None):
q = make_query(alarm_id=alarm_id, on_behalf_of=on_behalf_of, type=type,
user_id=user, project_id=project)
start_row, end_row = make_timestamp_query(
_make_general_rowkey_scan,
start=start_timestamp, start_op=start_timestamp_op,
end=end_timestamp, end_op=end_timestamp_op, bounds_only=True,
some_id=alarm_id)
with self.conn_pool.connection() as conn:
alarm_history_table = conn.table(self.ALARM_HISTORY_TABLE)
gen = alarm_history_table.scan(filter=q, row_start=start_row,
row_stop=end_row)
for ignored, data in gen:
stored_entry = deserialize_entry(data)[0]
yield models.AlarmChange(**stored_entry)
def record_alarm_change(self, alarm_change):
"""Record alarm change event.
"""
alarm_change_dict = serialize_entry(alarm_change)
ts = alarm_change.get('timestamp') or datetime.datetime.now()
rts = reverse_timestamp(ts)
with self.conn_pool.connection() as conn:
alarm_history_table = conn.table(self.ALARM_HISTORY_TABLE)
alarm_history_table.put(alarm_change.get('alarm_id') + "_" +
str(rts), alarm_change_dict)
def record_metering_data(self, data):
"""Write the data to the backend storage system.
:param data: a dictionary such as returned by
ceilometer.meter.meter_message_from_counter
"""
with self.conn_pool.connection() as conn:
project_table = conn.table(self.PROJECT_TABLE)
user_table = conn.table(self.USER_TABLE)
resource_table = conn.table(self.RESOURCE_TABLE)
meter_table = conn.table(self.METER_TABLE)
if data['user_id']:
user_table.put(data['user_id'], serialize_entry(
**{'source': data['source']}))
project_table.put(data['project_id'], serialize_entry(
**{'source': data['source']})
)
resource_metadata = data.get('resource_metadata', {})
# Determine the name of new meter
new_meter = _format_meter_reference(
data['counter_name'], data['counter_type'],
data['counter_unit'], data['source'])
#TODO(nprivalova): try not to store resource_id
resource = serialize_entry(**{
'source': data['source'], 'meter': new_meter,
'resource_metadata': resource_metadata,
'resource_id': data['resource_id'],
'project_id': data['project_id'], 'user_id': data['user_id']})
resource_table.put(data['resource_id'], resource)
#TODO(nprivalova): improve uniqueness
# Rowkey consists of reversed timestamp, meter and an md5 of
# user+resource+project for purposes of uniqueness
m = hashlib.md5()
m.update("%s%s%s" % (data['user_id'], data['resource_id'],
data['project_id']))
# We use reverse timestamps in rowkeys as they are sorted
# alphabetically.
rts = reverse_timestamp(data['timestamp'])
row = "%s_%d_%s" % (data['counter_name'], rts, m.hexdigest())
record = serialize_entry(data, **{'source': data['source'],
'rts': rts,
'message': data,
'recorded_at': timeutils.utcnow(
)})
meter_table.put(row, record)
def get_users(self, source=None):
"""Return an iterable of user id strings.
:param source: Optional source filter.
"""
with self.conn_pool.connection() as conn:
user_table = conn.table(self.USER_TABLE)
LOG.debug(_("Query User table: source=%s") % source)
scan_args = {}
if source:
scan_args['columns'] = ['f:s_%s' % source]
return sorted(key for key, ignored in user_table.scan(**scan_args))
def get_projects(self, source=None):
"""Return an iterable of project id strings.
:param source: Optional source filter.
"""
with self.conn_pool.connection() as conn:
project_table = conn.table(self.PROJECT_TABLE)
LOG.debug(_("Query Project table: source=%s") % source)
scan_args = {}
if source:
scan_args['columns'] = ['f:s_%s' % source]
return (key for key, ignored in project_table.scan(**scan_args))
def get_resources(self, user=None, project=None, source=None,
start_timestamp=None, start_timestamp_op=None,
end_timestamp=None, end_timestamp_op=None,
metaquery={}, resource=None, pagination=None):
"""Return an iterable of models.Resource instances
:param user: Optional ID for user that owns the resource.
:param project: Optional ID for project that owns the resource.
:param source: Optional source filter.
:param start_timestamp: Optional modified timestamp start range.
:param start_timestamp_op: Optional start time operator, like ge, gt.
:param end_timestamp: Optional modified timestamp end range.
:param end_timestamp_op: Optional end time operator, like lt, le.
:param metaquery: Optional dict with metadata to match on.
:param resource: Optional resource filter.
:param pagination: Optional pagination query.
"""
if pagination:
raise NotImplementedError('Pagination not implemented')
sample_filter = storage.SampleFilter(
user=user, project=project,
start=start_timestamp, start_timestamp_op=start_timestamp_op,
end=end_timestamp, end_timestamp_op=end_timestamp_op,
resource=resource, source=source, metaquery=metaquery)
q, start_row, stop_row = make_sample_query_from_filter(
sample_filter, require_meter=False)
with self.conn_pool.connection() as conn:
meter_table = conn.table(self.METER_TABLE)
LOG.debug(_("Query Meter table: %s") % q)
meters = meter_table.scan(filter=q, row_start=start_row,
row_stop=stop_row)
d_meters = []
for i, m in meters:
d_meters.append(deserialize_entry(m))
# We have to sort on resource_id before we can group by it.
# According to the itertools documentation a new group is
# generated when the value of the key function changes
# (it breaks there).
meters = sorted(d_meters, key=_resource_id_from_record_tuple)
for resource_id, r_meters in itertools.groupby(
meters, key=_resource_id_from_record_tuple):
# We need deserialized entry(data[0]), sources (data[1]) and
# metadata(data[3])
meter_rows = [(data[0], data[1], data[3]) for data in sorted(
r_meters, key=_timestamp_from_record_tuple)]
latest_data = meter_rows[-1]
min_ts = meter_rows[0][0]['timestamp']
max_ts = latest_data[0]['timestamp']
yield models.Resource(
resource_id=resource_id,
first_sample_timestamp=min_ts,
last_sample_timestamp=max_ts,
project_id=latest_data[0]['project_id'],
source=latest_data[1][0],
user_id=latest_data[0]['user_id'],
metadata=latest_data[2],
)
def get_meters(self, user=None, project=None, resource=None, source=None,
metaquery={}, pagination=None):
"""Return an iterable of models.Meter instances
:param user: Optional ID for user that owns the resource.
:param project: Optional ID for project that owns the resource.
:param resource: Optional resource filter.
:param source: Optional source filter.
:param metaquery: Optional dict with metadata to match on.
:param pagination: Optional pagination query.
"""
if pagination:
raise NotImplementedError(_('Pagination not implemented'))
with self.conn_pool.connection() as conn:
resource_table = conn.table(self.RESOURCE_TABLE)
q = make_query(metaquery=metaquery, user_id=user,
project_id=project, resource_id=resource,
source=source)
LOG.debug(_("Query Resource table: %s") % q)
gen = resource_table.scan(filter=q)
# We need result set to be sure that user doesn't receive several
# same meters. Please see bug
# https://bugs.launchpad.net/ceilometer/+bug/1301371
result = set()
for ignored, data in gen:
flatten_result, s, meters, md = deserialize_entry(data)
for m in meters:
meter_raw, m_source = m.split("+")
name, type, unit = meter_raw.split('!')
meter_dict = {'name': name,
'type': type,
'unit': unit,
'resource_id': flatten_result['resource_id'],
'project_id': flatten_result['project_id'],
'user_id': flatten_result['user_id']}
frozen_meter = frozenset(meter_dict.items())
if frozen_meter in result:
continue
result.add(frozen_meter)
meter_dict.update({'source':
m_source if m_source else None})
yield models.Meter(**meter_dict)
def get_samples(self, sample_filter, limit=None):
"""Return an iterable of models.Sample instances.
:param sample_filter: Filter.
:param limit: Maximum number of results to return.
"""
with self.conn_pool.connection() as conn:
meter_table = conn.table(self.METER_TABLE)
q, start, stop = make_sample_query_from_filter(
sample_filter, require_meter=False)
LOG.debug(_("Query Meter Table: %s") % q)
gen = meter_table.scan(filter=q, row_start=start, row_stop=stop)
for ignored, meter in gen:
if limit is not None:
if limit == 0:
break
else:
limit -= 1
d_meter = deserialize_entry(meter)[0]
d_meter['message']['recorded_at'] = d_meter['recorded_at']
yield models.Sample(**d_meter['message'])
@staticmethod
def _update_meter_stats(stat, meter):
"""Do the stats calculation on a requested time bucket in stats dict
:param stats: dict where aggregated stats are kept
:param index: time bucket index in stats
:param meter: meter record as returned from HBase
:param start_time: query start time
:param period: length of the time bucket
"""
vol = meter['counter_volume']
ts = meter['timestamp']
stat.unit = meter['counter_unit']
stat.min = min(vol, stat.min or vol)
stat.max = max(vol, stat.max)
stat.sum = vol + (stat.sum or 0)
stat.count += 1
stat.avg = (stat.sum / float(stat.count))
stat.duration_start = min(ts, stat.duration_start or ts)
stat.duration_end = max(ts, stat.duration_end or ts)
stat.duration = \
timeutils.delta_seconds(stat.duration_start,
stat.duration_end)
def get_meter_statistics(self, sample_filter, period=None, groupby=None,
aggregate=None):
"""Return an iterable of models.Statistics instances containing meter
statistics described by the query parameters.
The filter must have a meter value set.
.. note::
Due to HBase limitations the aggregations are implemented
in the driver itself, therefore this method will be quite slow
because of all the Thrift traffic it is going to create.
"""
if groupby:
raise NotImplementedError("Group by not implemented.")
if aggregate:
raise NotImplementedError('Selectable aggregates not implemented')
with self.conn_pool.connection() as conn:
meter_table = conn.table(self.METER_TABLE)
q, start, stop = make_sample_query_from_filter(sample_filter)
meters = map(deserialize_entry, list(meter for (ignored, meter) in
meter_table.scan(filter=q, row_start=start,
row_stop=stop)))
if sample_filter.start:
start_time = sample_filter.start
elif meters:
start_time = meters[-1][0]['timestamp']
else:
start_time = None
if sample_filter.end:
end_time = sample_filter.end
elif meters:
end_time = meters[0][0]['timestamp']
else:
end_time = None
results = []
if not period:
period = 0
period_start = start_time
period_end = end_time
# As our HBase meters are stored as newest-first, we need to iterate
# in the reverse order
for meter in meters[::-1]:
ts = meter[0]['timestamp']
if period:
offset = int(timeutils.delta_seconds(
start_time, ts) / period) * period
period_start = start_time + datetime.timedelta(0, offset)
if not results or not results[-1].period_start == \
period_start:
if period:
period_end = period_start + datetime.timedelta(
0, period)
results.append(
models.Statistics(unit='',
count=0,
min=0,
max=0,
avg=0,
sum=0,
period=period,
period_start=period_start,
period_end=period_end,
duration=None,
duration_start=None,
duration_end=None,
groupby=None)
)
self._update_meter_stats(results[-1], meter[0])
return results
###############
# This is a very crude version of "in-memory HBase", which implements just
# enough functionality of HappyBase API to support testing of our driver.
#
class MTable(object):
"""HappyBase.Table mock
"""
def __init__(self, name, families):
self.name = name
self.families = families
self._rows = {}
def row(self, key):
return self._rows.get(key, {})
def rows(self, keys):
return ((k, self.row(k)) for k in keys)
def put(self, key, data):
if key not in self._rows:
self._rows[key] = data
else:
self._rows[key].update(data)
def delete(self, key):
del self._rows[key]
def scan(self, filter=None, columns=[], row_start=None, row_stop=None):
sorted_keys = sorted(self._rows)
# copy data between row_start and row_stop into a dict
rows = {}
for row in sorted_keys:
if row_start and row < row_start:
continue
if row_stop and row > row_stop:
break
rows[row] = copy.copy(self._rows[row])
if columns:
ret = {}
for row in rows.keys():
data = rows[row]
for key in data:
if key in columns:
ret[row] = data
rows = ret
elif filter:
# TODO(jdanjou): we should really parse this properly,
# but at the moment we are only going to support AND here
filters = filter.split('AND')
for f in filters:
# Extract filter name and its arguments
g = re.search("(.*)\((.*),?\)", f)
fname = g.group(1).strip()
fargs = [s.strip().replace('\'', '')
for s in g.group(2).split(',')]
m = getattr(self, fname)
if callable(m):
# overwrite rows for filtering to take effect
# in case of multiple filters
rows = m(fargs, rows)
else:
raise NotImplementedError("%s filter is not implemented, "
"you may want to add it!")
for k in sorted(rows):
yield k, rows[k]
@staticmethod
def SingleColumnValueFilter(args, rows):
"""This method is called from scan() when 'SingleColumnValueFilter'
is found in the 'filter' argument
"""
op = args[2]
column = "%s:%s" % (args[0], args[1])
value = args[3]
if value.startswith('binary:'):
value = value[7:]
r = {}
for row in rows:
data = rows[row]
if op == '=':
if column in data and data[column] == value:
r[row] = data
elif op == '<=':
if column in data and data[column] <= value:
r[row] = data
elif op == '>=':
if column in data and data[column] >= value:
r[row] = data
else:
raise NotImplementedError("In-memory "
"SingleColumnValueFilter "
"doesn't support the %s operation "
"yet" % op)
return r
class MConnectionPool(object):
def __init__(self):
self.conn = MConnection()
def connection(self):
return self.conn
class MConnection(object):
"""HappyBase.Connection mock
"""
def __init__(self):
self.tables = {}
def __enter__(self, *args, **kwargs):
return self
def __exit__(self, exc_type, exc_val, exc_tb):
pass
def open(self):
LOG.debug(_("Opening in-memory HBase connection"))
def create_table(self, n, families={}):
if n in self.tables:
return self.tables[n]
t = MTable(n, families)
self.tables[n] = t
return t
def delete_table(self, name, use_prefix=True):
del self.tables[name]
def table(self, name):
return self.create_table(name)
#################################################
# Here be various HBase helpers
def reverse_timestamp(dt):
"""Reverse timestamp so that newer timestamps are represented by smaller
numbers than older ones.
Reverse timestamps is a technique used in HBase rowkey design. When period
queries are required the HBase rowkeys must include timestamps, but as
rowkeys in HBase are ordered lexicographically, the timestamps must be
reversed.
"""
epoch = datetime.datetime(1970, 1, 1)
td = dt - epoch
ts = td.microseconds + td.seconds * 1000000 + td.days * 86400000000
return 0x7fffffffffffffff - ts
def make_timestamp_query(func, start=None, start_op=None, end=None,
end_op=None, bounds_only=False, **kwargs):
"""Return a filter start and stop row for filtering and a query
which based on the fact that CF-name is 'rts'
:param start: Optional start timestamp
:param start_op: Optional start timestamp operator, like gt, ge
:param end: Optional end timestamp
:param end_op: Optional end timestamp operator, like lt, le
:param bounds_only: if True than query will not be returned
:param func: a function that provide a format of row
:param kwargs: kwargs for :param func
"""
rts_start, rts_end = get_start_end_rts(start, start_op, end, end_op)
start_row, end_row = func(rts_start, rts_end, **kwargs)
if bounds_only:
return start_row, end_row
q = []
# We dont need to dump here because get_start_end_rts returns strings
if rts_start:
q.append("SingleColumnValueFilter ('f', 'rts', <=, 'binary:%s')" %
rts_start)
if rts_end:
q.append("SingleColumnValueFilter ('f', 'rts', >=, 'binary:%s')" %
rts_end)
res_q = None
if len(q):
res_q = " AND ".join(q)
return start_row, end_row, res_q
def get_start_end_rts(start, start_op, end, end_op):
rts_start = str(reverse_timestamp(start) + 1) if start else ""
rts_end = str(reverse_timestamp(end) + 1) if end else ""
#By default, we are using ge for lower bound and lt for upper bound
if start_op == 'gt':
rts_start = str(long(rts_start) - 2)
if end_op == 'le':
rts_end = str(long(rts_end) - 1)
return rts_start, rts_end
def make_query(metaquery=None, **kwargs):
"""Return a filter query string based on the selected parameters.
:param metaquery: optional metaquery dict
:param kwargs: key-value pairs to filter on. Key should be a real
column name in db
"""
q = []
# Note: we use extended constructor for SingleColumnValueFilter here.
# It is explicitly specified that entry should not be returned if CF is not
# found in table.
for key, value in kwargs.items():
if value is not None:
if key == 'source':
q.append("SingleColumnValueFilter "
"('f', 's_%s', =, 'binary:%s', true, true)" %
(value, dump('1')))
else:
q.append("SingleColumnValueFilter "
"('f', '%s', =, 'binary:%s', true, true)" %
(key, dump(value)))
res_q = None
if len(q):
res_q = " AND ".join(q)
if metaquery:
meta_q = []
for k, v in metaquery.items():
meta_q.append(
"SingleColumnValueFilter ('f', '%s', =, 'binary:%s', "
"true, true)"
% ('r_' + k, dump(v)))
meta_q = " AND ".join(meta_q)
# join query and metaquery
if res_q is not None:
res_q += " AND " + meta_q
else:
res_q = meta_q # metaquery only
return res_q
def make_sample_query_from_filter(sample_filter, require_meter=True):
"""Return a query dictionary based on the settings in the filter.
:param sample_filter: SampleFilter instance
:param require_meter: If true and the filter does not have a meter,
raise an error.
"""
meter = sample_filter.meter
if not meter and require_meter:
raise RuntimeError('Missing required meter specifier')
start_row, end_row, ts_query = make_timestamp_query(
_make_general_rowkey_scan,
start=sample_filter.start, start_op=sample_filter.start_timestamp_op,
end=sample_filter.end, end_op=sample_filter.end_timestamp_op,
some_id=meter)
q = make_query(metaquery=sample_filter.metaquery,
user_id=sample_filter.user,
project_id=sample_filter.project,
counter_name=meter,
resource_id=sample_filter.resource,
source=sample_filter.source,
message_id=sample_filter.message_id)
if q:
ts_query = (" AND " + ts_query) if ts_query else ""
res_q = q + ts_query if ts_query else q
else:
res_q = ts_query if ts_query else None
return res_q, start_row, end_row
def _make_general_rowkey_scan(rts_start=None, rts_end=None, some_id=None):
"""If it's filter on some_id without start and end,
start_row = some_id while end_row = some_id + MAX_BYTE
"""
if some_id is None:
return None, None
if not rts_start:
rts_start = chr(127)
end_row = "%s_%s" % (some_id, rts_start)
start_row = "%s_%s" % (some_id, rts_end)
return start_row, end_row
def _format_meter_reference(counter_name, counter_type, counter_unit, source):
"""Format reference to meter data.
"""
return "%s!%s!%s+%s" % (counter_name, counter_type, counter_unit, source)
def _timestamp_from_record_tuple(record):
"""Extract timestamp from HBase tuple record
"""
return record[0]['timestamp']
def _resource_id_from_record_tuple(record):
"""Extract resource_id from HBase tuple record
"""
return record[0]['resource_id']
def deserialize_entry(entry, get_raw_meta=True):
"""Return a list of flatten_result, sources, meters and metadata
flatten_result contains a dict of simple structures such as 'resource_id':1
sources/meters are the lists of sources and meters correspondingly.
metadata is metadata dict. This dict may be returned as flattened if
get_raw_meta is False.
:param entry: entry from HBase, without row name and timestamp
:param get_raw_meta: If true then raw metadata will be returned
If False metadata will be constructed from
'f:r_metadata.' fields
"""
flatten_result = {}
sources = []
meters = []
metadata_flattened = {}
for k, v in entry.items():
if k.startswith('f:s_'):
sources.append(k[4:])
elif k.startswith('f:r_metadata.'):
metadata_flattened[k[len('f:r_metadata.'):]] = load(v)
elif k.startswith('f:m_'):
meters.append(k[4:])
else:
flatten_result[k[2:]] = load(v)
if get_raw_meta:
metadata = flatten_result.get('resource_metadata', {})
else:
metadata = metadata_flattened
return flatten_result, sources, meters, metadata
def serialize_entry(data={}, **kwargs):
"""Return a dict that is ready to be stored to HBase
:param data: dict to be serialized
:param kwargs: additional args
"""
entry_dict = copy.copy(data)
entry_dict.update(**kwargs)
result = {}
for k, v in entry_dict.items():
if k == 'source':
# user, project and resource tables may contain several sources.
# Besides, resource table may contain several meters.
# To make insertion safe we need to store all meters and sources in
# a separate cell. For this purpose s_ and m_ prefixes are
# introduced.
result['f:s_%s' % v] = dump('1')
elif k == 'meter':
result['f:m_%s' % v] = dump('1')
elif k == 'resource_metadata':
# keep raw metadata as well as flattened to provide
# capability with API v2. It will be flattened in another
# way on API level. But we need flattened too for quick filtering.
flattened_meta = dump_metadata(v)
for k, m in flattened_meta.items():
result['f:r_metadata.' + k] = dump(m)
result['f:resource_metadata'] = dump(v)
else:
result['f:' + k] = dump(v)
return result
def dump_metadata(meta):
resource_metadata = {}
for key, v in utils.dict_to_keyval(meta):
resource_metadata[key] = v
return resource_metadata
def dump(data):
return json.dumps(data, default=bson.json_util.default)
def load(data):
return json.loads(data, object_hook=object_hook)
# We don't want to have tzinfo in decoded json.This object_hook is
# overwritten json_util.object_hook for $date
def object_hook(dct):
if "$date" in dct:
dt = bson.json_util.object_hook(dct)
return dt.replace(tzinfo=None)
return bson.json_util.object_hook(dct)
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