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# -*- coding: utf-8 -*-
# Description: example netdata python.d module
# Authors: facetoe, dangtranhoang
import re
from copy import deepcopy
import psycopg2
from psycopg2 import extensions
from psycopg2.extras import DictCursor
from base import SimpleService
# default module values
update_every = 1
priority = 90000
retries = 60
ARCHIVE = """
SELECT
CAST(COUNT(*) AS INT) AS file_count,
CAST(COALESCE(SUM(CAST(archive_file ~ $r$\.ready$$r$ as INT)), 0) AS INT) AS ready_count,
CAST(COALESCE(SUM(CAST(archive_file ~ $r$\.done$$r$ AS INT)), 0) AS INT) AS done_count
FROM
pg_catalog.pg_ls_dir('pg_xlog/archive_status') AS archive_files (archive_file);
"""
BACKENDS = """
SELECT
count(*) - (SELECT count(*) FROM pg_stat_activity WHERE state = 'idle') AS backends_active,
(SELECT count(*) FROM pg_stat_activity WHERE state = 'idle' ) AS backends_idle
FROM
pg_stat_activity;
"""
TABLE_STATS = """
SELECT
((sum(relpages) * 8) * 1024) AS size_relations,
count(1) AS relations
FROM pg_class
WHERE relkind IN ('r', 't');
"""
INDEX_STATS = """
SELECT
((sum(relpages) * 8) * 1024) AS size_indexes,
count(1) AS indexes
FROM pg_class
WHERE relkind = 'i';"""
DATABASE = """
SELECT
datname AS database_name,
sum(numbackends) AS connections,
sum(xact_commit) AS xact_commit,
sum(xact_rollback) AS xact_rollback,
sum(blks_read) AS blks_read,
sum(blks_hit) AS blks_hit,
sum(tup_returned) AS tup_returned,
sum(tup_fetched) AS tup_fetched,
sum(tup_inserted) AS tup_inserted,
sum(tup_updated) AS tup_updated,
sum(tup_deleted) AS tup_deleted,
sum(conflicts) AS conflicts
FROM pg_stat_database
WHERE NOT datname ~* '^template\d+'
GROUP BY database_name;
"""
BGWRITER = 'SELECT * FROM pg_stat_bgwriter;'
DATABASE_LOCKS = """
SELECT
pg_database.datname as database_name,
mode,
count(mode) AS count
FROM pg_locks
INNER JOIN pg_database ON pg_database.oid = pg_locks.database
GROUP BY datname, mode
ORDER BY datname, mode;
"""
REPLICATION = """
SELECT
client_hostname,
client_addr,
state,
sent_offset - (
replay_offset - (sent_xlog - replay_xlog) * 255 * 16 ^ 6 ) AS byte_lag
FROM (
SELECT
client_addr, client_hostname, state,
('x' || lpad(split_part(sent_location, '/', 1), 8, '0'))::bit(32)::bigint AS sent_xlog,
('x' || lpad(split_part(replay_location, '/', 1), 8, '0'))::bit(32)::bigint AS replay_xlog,
('x' || lpad(split_part(sent_location, '/', 2), 8, '0'))::bit(32)::bigint AS sent_offset,
('x' || lpad(split_part(replay_location, '/', 2), 8, '0'))::bit(32)::bigint AS replay_offset
FROM pg_stat_replication
) AS s;
"""
LOCK_TYPES = [
'ExclusiveLock',
'RowShareLock',
'SIReadLock',
'ShareUpdateExclusiveLock',
'AccessExclusiveLock',
'AccessShareLock',
'ShareRowExclusiveLock',
'ShareLock',
'RowExclusiveLock'
]
ORDER = ['db_stat_transactions', 'db_stat_tuple_read', 'db_stat_tuple_returned', 'db_stat_tuple_write',
'backend_process', 'index_count', 'index_size', 'table_count', 'table_size', 'wal', 'background_writer']
CHARTS = {
'db_stat_transactions': {
'options': [None, 'Transactions on db', 'transactions/s', 'db statistics', 'postgres.db_stat_transactions', 'line'],
'lines': [
['db_stat_xact_commit', 'committed', 'incremental'],
['db_stat_xact_rollback', 'rolled back', 'incremental']
]},
'db_stat_connections': {
'options': [None, 'Current connections to db', 'count', 'db statistics', 'postgres.db_stat_connections', 'line'],
'lines': [
['db_stat_connections', 'connections', 'absolute']
]},
'db_stat_tuple_read': {
'options': [None, 'Tuple reads from db', 'reads/s', 'db statistics', 'postgres.db_stat_tuple_read', 'line'],
'lines': [
['db_stat_blks_read', 'disk', 'incremental'],
['db_stat_blks_hit', 'cache', 'incremental']
]},
'db_stat_tuple_returned': {
'options': [None, 'Tuples returned from db', 'tuples/s', 'db statistics', 'postgres.db_stat_tuple_returned', 'line'],
'lines': [
['db_stat_tup_returned', 'sequential', 'incremental'],
['db_stat_tup_fetched', 'bitmap', 'incremental']
]},
'db_stat_tuple_write': {
'options': [None, 'Tuples written to db', 'writes/s', 'db statistics', 'postgres.db_stat_tuple_write', 'line'],
'lines': [
['db_stat_tup_inserted', 'inserted', 'incremental'],
['db_stat_tup_updated', 'updated', 'incremental'],
['db_stat_tup_deleted', 'deleted', 'incremental'],
['db_stat_conflicts', 'conflicts', 'incremental']
]},
'backend_process': {
'options': [None, 'Current Backend Processes', 'processes', 'backend processes', 'postgres.backend_process', 'line'],
'lines': [
['backend_process_active', 'active', 'absolute'],
['backend_process_idle', 'idle', 'absolute']
]},
'index_count': {
'options': [None, 'Total indexes', 'index', 'indexes', 'postgres.index_count', 'line'],
'lines': [
['index_count', 'total', 'absolute']
]},
'index_size': {
'options': [None, 'Indexes size', 'MB', 'indexes', 'postgres.index_size', 'line'],
'lines': [
['index_size', 'size', 'absolute', 1, 1024 * 1024]
]},
'table_count': {
'options': [None, 'Total Tables', 'tables', 'tables', 'postgres.table_count', 'line'],
'lines': [
['table_count', 'total', 'absolute']
]},
'table_size': {
'options': [None, 'Tables size', 'MB', 'tables', 'postgres.table_size', 'line'],
'lines': [
['table_size', 'size', 'absolute', 1, 1024 * 1024]
]},
'wal': {
'options': [None, 'Write-Ahead Logging Statistics', 'files/s', 'write ahead log', 'postgres.wal', 'line'],
'lines': [
['wal_total', 'total', 'incremental'],
['wal_ready', 'ready', 'incremental'],
['wal_done', 'done', 'incremental']
]},
'background_writer': {
'options': [None, 'Checkpoints', 'writes/s', 'background writer', 'postgres.background_writer', 'line'],
'lines': [
['background_writer_scheduled', 'scheduled', 'incremental'],
['background_writer_requested', 'requested', 'incremental']
]}
}
class Service(SimpleService):
def __init__(self, configuration=None, name=None):
super(self.__class__, self).__init__(configuration=configuration, name=name)
self.order = ORDER
self.definitions = CHARTS
self.table_stats = configuration.pop('table_stats', True)
self.index_stats = configuration.pop('index_stats', True)
self.configuration = configuration
self.connection = None
self.is_superuser = False
self.data = {}
self.databases = set()
def _connect(self):
params = dict(user='postgres',
database=None,
password=None,
host='localhost',
port=5432)
params.update(self.configuration)
if not self.connection:
self.connection = psycopg2.connect(**params)
self.connection.set_isolation_level(extensions.ISOLATION_LEVEL_AUTOCOMMIT)
self.connection.set_session(readonly=True)
def check(self):
try:
self._connect()
cursor = self.connection.cursor()
self._discover_databases(cursor)
self._check_if_superuser(cursor)
cursor.close()
self._create_definitions()
return True
except Exception as e:
self.error(e)
return False
def _discover_databases(self, cursor):
cursor.execute("""
SELECT datname
FROM pg_stat_database
WHERE NOT datname ~* '^template\d+'
""")
self.databases = set(r[0] for r in cursor)
def _check_if_superuser(self, cursor):
cursor.execute("""
SELECT current_setting('is_superuser') = 'on' AS is_superuser;
""")
self.is_superuser = cursor.fetchone()[0]
def _create_definitions(self):
for database_name in self.databases:
for chart_template_name in list(CHARTS):
if chart_template_name.startswith('db_stat'):
self._add_database_stat_chart(chart_template_name, database_name)
self._add_database_lock_chart(database_name)
def _add_database_stat_chart(self, chart_template_name, database_name):
chart_template = CHARTS[chart_template_name]
chart_name = "{}_{}".format(database_name, chart_template_name)
if chart_name not in self.order:
self.order.insert(0, chart_name)
name, title, units, family, context, chart_type = chart_template['options']
self.definitions[chart_name] = {
'options': [
name,
title + ': ' + database_name,
units,
'db ' + database_name,
context,
chart_type
]
}
self.definitions[chart_name]['lines'] = []
for line in deepcopy(chart_template['lines']):
line[0] = "{}_{}".format(database_name, line[0])
self.definitions[chart_name]['lines'].append(line)
def _add_database_lock_chart(self, database_name):
chart_name = "{}_locks".format(database_name)
if chart_name not in self.order:
self.order.insert(-1, chart_name)
self.definitions[chart_name] = dict(
options=
[
None,
'Locks on db: ' + database_name,
'locks',
'db ' + database_name,
'postgres.db_locks',
'line'
],
lines=[]
)
for lock_type in LOCK_TYPES:
lock_id = "{}_{}".format(database_name, lock_type)
label = re.sub("([a-z])([A-Z])", "\g<1> \g<2>", lock_type)
self.definitions[chart_name]['lines'].append([lock_id, label, 'absolute'])
def _get_data(self):
self._connect()
cursor = self.connection.cursor(cursor_factory=DictCursor)
self.add_stats(cursor)
cursor.close()
return self.data
def add_stats(self, cursor):
self.add_database_stats(cursor)
self.add_backend_stats(cursor)
if self.index_stats:
self.add_index_stats(cursor)
if self.table_stats:
self.add_table_stats(cursor)
self.add_lock_stats(cursor)
self.add_bgwriter_stats(cursor)
# self.add_replication_stats(cursor)
if self.is_superuser:
self.add_wal_stats(cursor)
def add_database_stats(self, cursor):
cursor.execute(DATABASE)
for row in cursor:
database_name = row.get('database_name')
self.data["{}_{}".format(database_name, 'db_stat_xact_commit')] = int(row.get('xact_commit', 0))
self.data["{}_{}".format(database_name, 'db_stat_xact_rollback')] = int(row.get('xact_rollback', 0))
self.data["{}_{}".format(database_name, 'db_stat_blks_read')] = int(row.get('blks_read', 0))
self.data["{}_{}".format(database_name, 'db_stat_blks_hit')] = int(row.get('blks_hit', 0))
self.data["{}_{}".format(database_name, 'db_stat_tup_returned')] = int(row.get('tup_returned', 0))
self.data["{}_{}".format(database_name, 'db_stat_tup_fetched')] = int(row.get('tup_fetched', 0))
self.data["{}_{}".format(database_name, 'db_stat_tup_inserted')] = int(row.get('tup_inserted', 0))
self.data["{}_{}".format(database_name, 'db_stat_tup_updated')] = int(row.get('tup_updated', 0))
self.data["{}_{}".format(database_name, 'db_stat_tup_deleted')] = int(row.get('tup_deleted', 0))
self.data["{}_{}".format(database_name, 'db_stat_conflicts')] = int(row.get('conflicts', 0))
self.data["{}_{}".format(database_name, 'db_stat_connections')] = int(row.get('connections', 0))
def add_backend_stats(self, cursor):
cursor.execute(BACKENDS)
temp = cursor.fetchone()
self.data['backend_process_active'] = int(temp.get('backends_active', 0))
self.data['backend_process_idle'] = int(temp.get('backends_idle', 0))
def add_index_stats(self, cursor):
cursor.execute(INDEX_STATS)
temp = cursor.fetchone()
self.data['index_count'] = int(temp.get('indexes', 0))
self.data['index_size'] = int(temp.get('size_indexes', 0))
def add_table_stats(self, cursor):
cursor.execute(TABLE_STATS)
temp = cursor.fetchone()
self.data['table_count'] = int(temp.get('relations', 0))
self.data['table_size'] = int(temp.get('size_relations', 0))
def add_lock_stats(self, cursor):
cursor.execute(DATABASE_LOCKS)
# zero out all current lock values
for database_name in self.databases:
for lock_type in LOCK_TYPES:
self.data["{}_{}".format(database_name, lock_type)] = 0
# populate those that have current locks
for row in cursor:
database_name, lock_type, lock_count = row
self.data["{}_{}".format(database_name, lock_type)] = lock_count
def add_wal_stats(self, cursor):
cursor.execute(ARCHIVE)
temp = cursor.fetchone()
self.data['wal_total'] = int(temp.get('file_count', 0))
self.data['wal_ready'] = int(temp.get('ready_count', 0))
self.data['wal_done'] = int(temp.get('done_count', 0))
def add_bgwriter_stats(self, cursor):
cursor.execute(BGWRITER)
temp = cursor.fetchone()
self.data['background_writer_scheduled'] = temp.get('checkpoints_timed', 0)
self.data['background_writer_requested'] = temp.get('checkpoints_requests', 0)
'''
def add_replication_stats(self, cursor):
cursor.execute(REPLICATION)
temp = cursor.fetchall()
for row in temp:
self.add_gauge_value('Replication/%s' % row.get('client_addr', 'Unknown'),
'byte_lag',
int(row.get('byte_lag', 0)))
'''
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