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postgresql.py
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postgresql.py
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from collections import defaultdict
import psycopg2
import psycopg2.extras
from porkchop.plugin import PorkchopPlugin
def exc(conn, query, col_key = None, col_val = None):
data = {}
cursor = conn.cursor(cursor_factory=psycopg2.extras.DictCursor)
cursor.execute(query)
if col_key and col_val:
for row in cursor.fetchall():
data[row[col_key]] = row[col_val]
else:
data = cursor.fetchall()
return data
class PostgresqlPlugin(PorkchopPlugin):
def _connect(self, dbname = None):
dbname = dbname if dbname else 'postgres'
try:
conn_string = "host='%s' dbname='%s' user='%s' password='%s'" %\
(self.config['postgresql']['host'],
dbname,
self.config['postgresql']['user'],
self.config['postgresql']['password'])
conn = psycopg2.connect(conn_string)
conn.set_isolation_level(0) # don't need transactions
except:
return None
return conn
def get_data(self):
data = self.gendict()
conn = self._connect()
datname_list_query = "SELECT datname FROM pg_database \
WHERE datallowconn AND NOT datistemplate \
AND NOT datname='postgres' ORDER BY 1 LIMIT 10"
buffercache_query = 'SELECT sum(blks_read) \
AS blks_read,sum(blks_hit) AS blks_hit \
FROM pg_stat_database'
all_conn_count_query = "SELECT tmp.state,COALESCE(count,0) FROM \
(VALUES ('active'),('waiting'),('idle'),\
('idletransaction'),('unknown')) AS tmp(state) \
LEFT JOIN \
(SELECT CASE WHEN waiting THEN 'waiting' \
WHEN current_query='<IDLE>' THEN 'idle' \
WHEN current_query='<IDLE> in transaction' \
THEN 'idletransaction' \
WHEN current_query='<insufficient privilege>' \
THEN 'unknown' ELSE 'active' END AS state, \
count(*) AS count \
FROM pg_stat_activity \
WHERE procpid != pg_backend_pid() \
GROUP BY CASE WHEN waiting THEN 'waiting' \
WHEN current_query='<IDLE>' THEN 'idle' \
WHEN current_query='<IDLE> in transaction' \
THEN 'idletransaction' \
WHEN current_query='<insufficient privilege>' \
THEN 'unknown' ELSE 'active' END \
) AS tmp2 \
ON tmp.state=tmp2.state ORDER BY 1"
db_conn_count_query = 'SELECT pg_database.datname, \
COALESCE(count,0) AS count FROM pg_database \
LEFT JOIN \
(SELECT datname,count(*) FROM pg_stat_activity \
WHERE procpid != pg_backend_pid() \
GROUP BY datname) AS tmp \
ON pg_database.datname=tmp.datname \
WHERE datallowconn ORDER BY 1'
user_conn_count_query = 'SELECT usename,count(*) \
FROM pg_stat_activity \
WHERE procpid != pg_backend_pid() \
GROUP BY usename ORDER BY 1'
locks_query = 'SELECT lower(mode) AS mode,count(*) \
FROM pg_locks WHERE database \
IS NOT NULL GROUP BY mode ORDER BY 1'
db_size_query = 'SELECT datname,pg_database_size(oid) \
FROM pg_database ORDER BY 1'
query_time_query = "SELECT 'query' AS type, COALESCE(max(extract(epoch \
FROM CURRENT_TIMESTAMP-query_start)),0) \
FROM pg_stat_activity WHERE current_query \
NOT LIKE '<IDLE%' UNION ALL \
SELECT 'transaction', \
COALESCE(max(extract(epoch \
FROM CURRENT_TIMESTAMP-xact_start)),0) \
FROM pg_stat_activity WHERE 1=1"
idle_xact_time_query = "SELECT datname, \
max(COALESCE(ROUND(EXTRACT(epoch \
FROM now()-query_start)),0)) FROM pg_stat_activity \
WHERE current_query = '<IDLE> in transaction' \
GROUP BY 1"
xact_count_query = "SELECT 'commit' AS type, \
sum(pg_stat_get_db_xact_commit(oid)) FROM pg_database \
UNION ALL SELECT 'rollback', \
sum(pg_stat_get_db_xact_rollback(oid)) FROM pg_database"
scan_type_query = 'SELECT COALESCE(sum(seq_scan),0) AS sequential, \
COALESCE(sum(idx_scan),0) AS index \
FROM pg_stat_user_tables'
xlog_query = "SELECT count(*) AS segments FROM pg_ls_dir('pg_xlog') t(fn) \
WHERE fn ~ '^[0-9A-Z]{24}\$'"
tuple_access_query = "SELECT COALESCE(sum(seq_tup_read),0) AS seqread, \
COALESCE(sum(idx_tup_fetch),0) AS idxfetch, \
COALESCE(sum(n_tup_ins),0) AS inserted, \
COALESCE(sum(n_tup_upd),0) AS updated, \
COALESCE(sum(n_tup_del),0) AS deleted, \
COALESCE(sum(n_tup_hot_upd),0) AS hotupdated \
FROM pg_stat_user_tables"
data['query_time'] = exc(conn, query_time_query, 'type', 'coalesce')
datnames = exc(conn, datname_list_query)[0]
data['datnames'] = ', '.join(datnames)
row = exc(conn, 'SELECT * from pg_stat_bgwriter')[0]
for key in row.keys():
data['bgwriter'][key] = row[key]
row = exc(conn, buffercache_query)[0]
for key in row.keys():
data['buffercache'][key] = row[key]
data['connections'] = {
'state': exc(conn, all_conn_count_query, 'state', 'coalesce'),
'database': exc(conn, db_conn_count_query, 'datname', 'count'),
'user': exc(conn, user_conn_count_query, 'usename', 'count')
}
data['size'] = exc(conn, db_size_query, 'datname', 'pg_database_size')
data['locks'] = exc(conn, locks_query, 'mode', 'count')
data['idle_xact_time'] = exc(conn, idle_xact_time_query, 'datname', 'max')
data['xactn_count'] = exc(conn, xact_count_query, 'type', 'sum')
row = exc(conn, xlog_query)[0]
for key in row.keys():
data['xlog'][key] = row[key]
for db in datnames:
conn2 = self._connect(db)
row = exc(conn2, tuple_access_query)[0]
for key in row.keys():
data['tuple_access'][db][key] = row[key]
row = exc(conn2, scan_type_query)[0]
for key in row.keys():
data['scans'][db][key] = row[key]
try:
slony_db = self.config['postgresql']['slony_db']
slony_node_string = self.config['postgresql']['slony_node_string']
slony_table = self.config['postgresql']['slony_table']
replication_lag_query = "SELECT SUBSTRING(sl.no_comment \
FROM '%s') AS NODE, \
st.st_lag_num_events AS lag_events \
FROM %s.sl_status AS st, %s.sl_node AS sl \
WHERE sl.no_id = st.st_received" % \
(slony_node_string, slony_table, slony_table)
conn2 = self._connect(slony_db)
data['slony_replication'] = exc(conn2, replication_lag_query,
'node',
'lag_events')
except:
pass
return data