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checkBackup.py
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checkBackup.py
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#!/usr/bin/env python
import os
import sys
import shutil
import getopt
import prepare_database as pd
import logging
import subprocess
import socket
import smtplib
import time
import distutils.spawn as ds
from html import HTML
import database
#TODO one module with prepare_database
port = '5433'
version = '9.1'
Directory = None
BaseBackupArch = None
pgUser = 'postgres'
pgPass = 'postgres'
host = '127.0.0.1'
pgBin = 'pg_ctl'
statisticFileName = '/tmp/pgstat'
try:
sender = os.getlogin() + '@' + socket.gethostname()
except OSError:
sender = 'cron'
receivers = ['evg.selyavka@gmail.com','aladin@okko.tv','sburdakov@okko.tv']
mailServer = 'relay.spb.play.dc'
class Error(Exception):
"""Base class for other exceptions"""
pass
class DirectoryNotExists(Error):
"""Raised when directory doesn't exists"""
pass
class DirectoryPathIsNotAbs(Error):
"""Raised when directory path isn't absolute"""
pass
def usage():
print """%s, usage\n
-h/--help - display this help\n
<-a/--archive> - basebackup archive\n
<-d/--directory> - directory where to restore\n
[-u/--user] - postgresql user, default is postgres\n
[-w/--password] - postgresql user password, default is postgres\n
[-p/--port] - postgresql listen port, default is 5433\n
[-v/--version] - postgres version, default is 9.1\n
""" % os.path.abspath(__file__)
sys.exit(0)
def getAbsPath(version):
path = ['/usr/lib/postgresql/' + version + '/bin/' + pgBin, '/usr/pgsql-' + version + '/bin']
for p in path:
if os.access(p, os.X_OK):
return os.path.abspath(p)
def generateExecutable():
global version
global pgBin
if version:
if ds.find_executable(pgBin) is not None:
return os.path.abspath(ds.find_executable(pgBin))
else:
return getAbsPath(version)
else:
return getAbsPath('9.1')
def getDatabases(user, passwd, host, port):
ch = database.DB('postgres', user, passwd, host, port)
logging.debug('ch: %s', ch)
if ch.conn is not None:
curr = ch.conn.cursor()
curr.execute('SELECT datname FROM pg_database WHERE datname NOT IN (%s, %s, %s)', ('postgres', 'template0', 'template1'))
databases = curr.fetchall()
curr.close()
del ch
return databases
else:
logging.error('Can\'t connect to postgresql cluster due to timeout')
return None
def getSampleStatistics(user, passwd, host, port):
statistics = dict()
bufDic = dict()
databases = getDatabases(user, passwd, host, port)
if databases is not None:
query = '''WITH allTables AS (
SELECT c.relname AS tablename
FROM pg_catalog.pg_class c
LEFT JOIN pg_catalog.pg_namespace n ON n.oid = c.relnamespace
WHERE c.relkind IN (
'r'
,''
)
AND n.nspname <> 'pg_catalog'
AND n.nspname <> 'information_schema'
AND n.nspname !~ '^pg_toast'
AND pg_catalog.pg_table_is_visible(c.oid)
ORDER BY tablename
)
SELECT relname
,n_live_tup
FROM pg_stat_user_tables
WHERE relname IN (
SELECT tablename
FROM allTables
)
'''
for e in databases:
for d in e:
ch = database.DB(d, user, passwd, host, port)
curr = ch.conn.cursor()
curr.execute(query)
bufDic[d] = curr.fetchall()
logging.debug('Db statistics dict %s' % bufDic)
statistics.update(bufDic)
curr.close()
del ch
return statistics
else:
logging.error('Can\'t fetch list of existing databases for generate statistics')
return None
def generateHTML(unionTablesSet, requestedTablesDict, readTablesDict, diffRequestedTableDict = None, diffReadTableDict = None):
h = HTML()
t = h.table(border='1', cellpadding='1', cellspacing='1', style='width: 500px;')
r = t.tr
r.td('Requested from Backup', colspan='3')
r.td('Read from previous Backup', colspan='3')
r.td('Difference', colspan='3')
r = t.tr
r.td('Database')
r.td('Table')
r.td('Live')
r.td('Database')
r.td('Table')
r.td('Live')
r.td('Count')
for v in unionTablesSet:
try:
diff = requestedTablesDict[v] - readTablesDict[v]
except KeyError:
diff = 0
r = t.tr
r.td(v.split(":")[0])
r.td(v.split(":")[1])
r.td(str(requestedTablesDict[v]))
r.td(v.split(":")[0])
r.td(v.split(":")[1])
r.td(str(readTablesDict[v]))
if diff > 0:
r.td(str(diff),bgcolor='green')
elif diff < 0:
r.td(str(diff),bgcolor='red')
else:
r.td(str(diff))
if diffRequestedTableDict is not None and diffReadTableDict is None:
for k in diffRequestedTableDict.keys():
r = t.tr(bgcolor='red')
r.td(k.split(":")[0])
r.td(k.split(":")[1])
r.td(str(diffRequestedTableDict[k]))
r.td('Can''t find corresponding table in file', colspan='4')
elif diffReadTableDict is not None and diffRequestedTableDict is None:
for k in diffReadTableDict.keys():
r = t.tr(bgcolor='red')
r.td('Can''t find corresponding table in requested database', colspan='3')
r.td(k.split(":")[0])
r.td(k.split(":")[1])
r.td(str(diffReadTableDict[k]))
r.td(' ')
elif diffReadTableDict is not None and diffRequestedTableDict is not None:
for k in diffRequestedTableDict.keys():
r = t.tr(bgcolor='red')
r.td(k.split(":")[0])
r.td(k.split(":")[1])
r.td(str(diffRequestedTableDict[k]))
r.td('Can''t find corresponding table in file', colspan='4')
for k in diffReadTableDict.keys():
r = t.tr(bgcolor='red')
r.td('Can''t find corresponding table in requested database', colspan='3')
r.td(k.split(":")[0])
r.td(k.split(":")[1])
r.td(str(diffReadTableDict[k]))
r.td(' ')
return str(t)
def sendEmail(sender, receivers, mailServer, html):
message = '''From: %s
To: %s
MIME-Version: 1.0
Content-type: text/html
Subject: Database restore statistics
''' % (sender, ','.join(receivers))
try:
smtpObj = smtplib.SMTP(mailServer)
smtpObj.sendmail(sender, receivers, message+html)
logging.info('Successfully sent email')
except SMTPException:
logging.error('Error: unable to send email')
def compareStatistics(statistics, fileName, port):
if statistics is None:
return "<h1>Can't generate report, statistics is unavailable</h1>"
firstTime = False
requestedStatList = list()
readStatList = list()
result = ''
try:
f = open(fileName + "_" + port, 'r+')
logging.debug('File %s successfully open' % (fileName + "_" + port))
except IOError:
firstTime = True
try:
f = open(fileName + "_" + port, 'w+')
logging.debug('File %s successfully open in first time' % (fileName + "_" + port))
except IOError:
raise IOError, "Can't open file %s" % (fileName + "_" + port)
for d in statistics.keys():
for tables in statistics[d]:
requestedStatList.append(d + ":" + tables[0] + ":" + str(tables[1]) + "\n")
if firstTime:
readStatList = requestedStatList
else:
readStatList = f.readlines()
requestedTablesDict = dict()
readTablesDict = dict()
for s in requestedStatList:
requestedTablesDict[s.split(":")[0] + ":" + s.split(":")[1]] = long(s.split(":")[2].replace("\n",""))
for s in readStatList:
readTablesDict[s.split(":")[0] + ":" + s.split(":")[1]] = long(s.split(":")[2].replace("\n",""))
requestedTablesSet = set(requestedTablesDict.keys()) - set(readTablesDict.keys())
readTablesDiffSet = set(readTablesDict.keys()) - set(requestedTablesDict.keys())
unionTablesSet = set(readTablesDict.keys()) & set(requestedTablesDict.keys())
if requestedTablesSet is not None and readTablesDiffSet is None:
diffRequestedTableDict = dict()
for e in requestedTablesSet:
diffRequestedTableDict[e] = requestedTablesDict[e]
result = generateHTML(unionTablesSet, requestedTablesDict, readTablesDict, diffRequestedTableDict)
elif readTablesDiffSet is not None and requestedTablesSet is None:
diffReadTableDict = dict()
for e in readTablesDiffSet:
diffReadTableDict[e] = readTablesDict[e]
result = generateHTML(unionTablesSet, requestedTablesDict, readTablesDict, None, diffReadTableDict)
elif requestedTablesSet is not None and readTablesDiffSet is not None:
diffRequestedTableDict = dict()
for e in requestedTablesSet:
diffRequestedTableDict[e] = requestedTablesDict[e]
diffReadTableDict = dict()
for e in readTablesDiffSet:
diffReadTableDict[e] = readTablesDict[e]
result = generateHTML(unionTablesSet, requestedTablesDict, readTablesDict, diffRequestedTableDict, diffReadTableDict)
else:
result = generateHTML(unionTablesSet, requestedTablesDict, readTablesDict)
f.seek(0,0)
f.truncate()
f.writelines(requestedStatList)
f.close()
return result
# TODO multi thread support
def analyzeDb(user, passwd, host, port):
databases = getDatabases(user, passwd, host, port)
logging.debug('Database list %s' % databases)
if databases is not None:
for e in databases:
for d in e:
ch = database.DB(d, user, passwd, host, port)
curr = ch.conn.cursor()
logging.debug('Perform ANALYZE on %s database' % d)
curr.execute('ANALYZE')
curr.close()
del ch
else:
logging.error('Can\'t fetch list of existing databases in cluster for analyze execution')
def stopPostgres():
global Directory
FNULL = open(os.devnull, 'w')
pgExecutable = generateExecutable()
if os.path.exists(pgExecutable):
try:
subprocess.check_call([pgExecutable, 'stop', '-D', Directory, '-m', 'fast'], stdout=FNULL, stderr=subprocess.STDOUT)
logging.info("Postmaster is stoped in directory %s" % Directory)
except subprocess.CalledProcessError:
logging.info("Postmaster already stoped in directory %s" % Directory)
except Exception:
raise
else:
raise OSError, 'File %s doesn\'t exists' % pgExecutable
def startPostgres():
global Directory
FNULL = open(os.devnull, 'w')
pgExecutable = generateExecutable()
if os.path.exists(pgExecutable):
try:
subprocess.check_call([pgExecutable, 'start', '-D', Directory], stdout=FNULL, stderr=subprocess.STDOUT)
logging.info("Postmaster is started in directory %s" % Directory)
except subprocess.CalledProcessError:
logging.info("Postmaster can't start in directory %s, check postmaster log output" % Directory)
except Exception:
raise
else:
raise OSError, 'File %s doesn\'t exists' % pgExecutable
def createLinks(linkName):
global Directory
dirs = os.listdir( Directory )
flag = None
if not os.path.exists(Directory + '/' + linkName):
for file in dirs:
if file.endswith('.simple'):
try:
flag = True
os.symlink(Directory + '/' + file, Directory + '/' + linkName)
except:
raise
if not flag:
logging.info("Can't find autovacuum.conf.simple in %s" % Directory)
def cleanupArgv(argvList, itemsList):
for item in itemsList:
if item in argvList:
argvList.remove(item)
return argvList
def checkDir(path):
if os.path.exists(path):
if os.path.isabs(path):
pass
else:
raise DirectoryPathIsNotAbs, "Path %s isn\'t absolute" % path
else:
raise DirectoryNotExists, "Directory %s doesn't exists" % path
def mkDir(path):
try:
checkDir(path)
except DirectoryPathIsNotAbs, e:
raise DirectoryPathIsNotAbs, e
except DirectoryNotExists:
os.mkdir(path)
def rmDir(path):
try:
checkDir(path)
shutil.rmtree(path)
except DirectoryPathIsNotAbs, e:
raise DirectoryPathIsNotAbs, e
except DirectoryNotExists, e:
mkDir(path)
chmodDir(path)
def chmodDir(path, perm = 0700):
try:
checkDir(path)
os.chmod(Directory, perm)
except DirectoryPathIsNotAbs, e:
raise DirectoryPathIsNotAbs, e
except DirectoryNotExists, e:
raise DirectoryNotExists, e
def main(argv):
global Directory
global BaseBackupArch
global port
global version
global pgUser
global pgPass
try:
opts, args = getopt.getopt(argv,"h:a:d:u:w:p:v",["help=","archive=","directory=","user","password","port=","version="])
except getopt.GetoptError:
usage()
sys.exit(2)
if len(opts) == 0 or len(opts) == 1:
usage()
sys.exit(2)
for opt, arg in opts:
if opt in ("-h", "--help"):
usage()
elif opt in ("-a", "--archive"):
BaseBackupArch = arg
elif opt in ("-d", "--directory"):
Directory = arg
elif opt in ("-u", "--user"):
pgUser = arg
elif opt in ("-w", "--password"):
pgPass = arg
elif opt in ("-p", "--port"):
port = arg
elif opt in ("-v", "--version"):
version = arg
else:
assert False, "unhandled option"
if Directory is None or BaseBackupArch is None:
usage()
stopPostgres()
rmDir(Directory)
mkDir(Directory)
chmodDir(Directory)
pd.main(cleanupArgv(argv, ["-v", "--version","-w", "--password", "-u", "--user"]))
# createLinks('autovacuum.conf')
startPostgres()
analyzeDb(pgUser, pgPass, host, port)
statStr = compareStatistics(getSampleStatistics(pgUser, pgPass, host, port), statisticFileName, port)
sendEmail(sender, receivers, mailServer, statStr)
if __name__=='__main__':
main(sys.argv[1:])