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localhost_postgres_stats.py
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localhost_postgres_stats.py
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# -*- coding: utf-8 -*-
#
# 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.
"""
This module contains code for statistics extraction that is based
on access to local Postgres data directory.
"""
import os
import re
from postgresql_metrics.common import get_logger
LOG = get_logger()
def get_multixact_member_files(data_dir):
try:
members_dir = os.path.join(data_dir, "pg_multixact", "members")
if os.path.isdir(members_dir):
return len([f for f in os.listdir(members_dir) if os.path.isfile(os.path.join(members_dir, f))])
else:
LOG.exception(f"Missing pg_multixact/members directory in data_dir: {data_dir}")
except OSError:
LOG.exception('Failed accessing multixact member files in: {data_dir}. Is data dir readable by user?')
return 0
def get_amount_of_wal_files(data_dir):
amount_of_wal_files = 0
try:
if data_dir and os.path.isdir(data_dir):
wal_dir = os.path.join(data_dir, 'pg_wal')
if not os.path.isdir(wal_dir):
wal_dir = os.path.join(data_dir, 'pg_xlog')
# each WAL file is named as 24-character hexadecimal number
for possible_wal_file_name in os.listdir(wal_dir):
if re.match('^[0-9A-F]{24}$', possible_wal_file_name):
amount_of_wal_files += 1
except OSError:
LOG.exception('Failed accessing WAL files. Is data dir readable by user?')
return amount_of_wal_files