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Changing the script so reconnections to the master also works following a failover #2

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Changing the script so reconnections to the master also works following a failover #2

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72 changes: 35 additions & 37 deletions patroni/HAtester.py
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Original file line number Diff line number Diff line change
Expand Up @@ -46,55 +46,53 @@
###############################################################################

import sys,time,psycopg2

def create_conn():
try:
conn = psycopg2.connect(connectionString)
except psycopg2.Error as e:
print("Unable to connect to database :")
print(e)
sys.exit(1)
conn = None
return conn

if __name__ == "__main__":
conn = create_conn()
if conn is not None:
cur = conn.cursor()
while True:
try:
time.sleep(1)
if conn is not None:
cur = conn.cursor()
while True:
try:
if conn is not None:
cur = conn.cursor()
else:
raise Exception("Connection not ready")
# Check if connected to master or replica
# NOTE: a recently promoted/demoted server may still be transitioning and
# initially reply with the previous role
cur.execute("select pg_is_in_recovery(),inet_server_addr()")
rows = cur.fetchone()
if (rows[0] == False):
print (" Working with: MASTER - %s" % rows[1]),
if doDML:
cur.execute("INSERT INTO HATEST VALUES(CURRENT_TIMESTAMP) RETURNING TM")
if cur.rowcount == 1 :
conn.commit()
tmrow = str(cur.fetchone()[0])
print (' Inserted: %s\n' % tmrow)
else:
raise Exception("Connection not ready")
#Check connected to master or Slave
cur.execute("select pg_is_in_recovery(),inet_server_addr()")
rows = cur.fetchone()
if (rows[0] == False):
print (" Working with: MASTER - %s" % rows[1]),
if doDML:
cur.execute("INSERT INTO HATEST VALUES(CURRENT_TIMESTAMP) RETURNING TM")
if cur.rowcount == 1 :
conn.commit()
tmrow = str(cur.fetchone()[0])
print (' Inserted: %s\n' % tmrow)
else:
print ("No Attempt to insert data")
print ("No Attempt to insert data")
else:
print (" Working with: REPLICA - %s" % rows[1]),
if doDML:
cur.execute("SELECT MAX(TM) FROM HATEST")
row = cur.fetchone()
print (" Retrieved: %s\n" % str(row[0]))
else:
print (" Working with: REPLICA - %s" % rows[1]),
if doDML:
cur.execute("SELECT MAX(TM) FROM HATEST")
row = cur.fetchone()
print (" Retrived: %s\n" % str(row[0]))
else:
print ("No Attempt to retrive data")

except:
print ("Trying to connect")
if conn is not None:
conn.close()
conn = create_conn()
if conn is not None:
cur = conn.cursor()
print ("No Attempt to retrieve data")
time.sleep(1)
except:
print ("Trying to connect")
if conn is not None:
conn.close()
conn = create_conn()

conn.close()

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