diff options
Diffstat (limited to '')
| -rw-r--r-- | python.d/postgres.chart.py | 386 |
1 files changed, 386 insertions, 0 deletions
diff --git a/python.d/postgres.chart.py b/python.d/postgres.chart.py new file mode 100644 index 00000000..919b6f8e --- /dev/null +++ b/python.d/postgres.chart.py @@ -0,0 +1,386 @@ +# -*- 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::text, '/', 1), 8, '0'))::bit(32)::bigint AS sent_xlog, + ('x' || lpad(split_part(replay_location::text, '/', 1), 8, '0'))::bit(32)::bigint AS replay_xlog, + ('x' || lpad(split_part(sent_location::text, '/', 2), 8, '0'))::bit(32)::bigint AS sent_offset, + ('x' || lpad(split_part(replay_location::text, '/', 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 = "{0}_{1}".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] = "{0}_{1}".format(database_name, line[0]) + self.definitions[chart_name]['lines'].append(line) + + def _add_database_lock_chart(self, database_name): + chart_name = "{0}_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 = "{0}_{1}".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["{0}_{1}".format(database_name, 'db_stat_xact_commit')] = int(row.get('xact_commit', 0)) + self.data["{0}_{1}".format(database_name, 'db_stat_xact_rollback')] = int(row.get('xact_rollback', 0)) + self.data["{0}_{1}".format(database_name, 'db_stat_blks_read')] = int(row.get('blks_read', 0)) + self.data["{0}_{1}".format(database_name, 'db_stat_blks_hit')] = int(row.get('blks_hit', 0)) + self.data["{0}_{1}".format(database_name, 'db_stat_tup_returned')] = int(row.get('tup_returned', 0)) + self.data["{0}_{1}".format(database_name, 'db_stat_tup_fetched')] = int(row.get('tup_fetched', 0)) + self.data["{0}_{1}".format(database_name, 'db_stat_tup_inserted')] = int(row.get('tup_inserted', 0)) + self.data["{0}_{1}".format(database_name, 'db_stat_tup_updated')] = int(row.get('tup_updated', 0)) + self.data["{0}_{1}".format(database_name, 'db_stat_tup_deleted')] = int(row.get('tup_deleted', 0)) + self.data["{0}_{1}".format(database_name, 'db_stat_conflicts')] = int(row.get('conflicts', 0)) + self.data["{0}_{1}".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["{0}_{1}".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["{0}_{1}".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))) +''' |