netdata/python.d/postgres.chart.py at master · trashSydowDev/netdata · GitHub

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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(str(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)))

'''

netdata/python.d/postgres.chart.py at master · trashSydowDev/netdata · GitHub

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