import MySQLdb
import time
import subprocess
import StringIO
import re
from wol import *
import os
import signal
from Util import *
import abc
import sqlite3
from mysql2sqlite import mysql_to_sqlite

def isMachineResponding(machineName):
	(returnCode, stdout, stderr) = executeProgram( [ 'ping', '-o', '-t', '1', machineName ] )
	#log( 'isMachineResponding : result of command %s : %d' % (command, returnCode) )
	
	if returnCode == 0:
		return True
	else:
		bMachineNameIsNotKnown = (returnCode == 68)
		bMachineIsNotResponding = (returnCode == 2)
		if bMachineIsNotResponding == False:
			bBUG_00000004_IS_STILL_ALIVE = True
			if bBUG_00000004_IS_STILL_ALIVE == True and returnCode == 142:
				log('isMachineResponding : bug00000004 Unexpected return code : returnCode=%d, stdout="%s", stderr="%s" , machineName = %s' % (returnCode, stdout, stderr, machineName) )
				# don't stop the program until we understand bug00000004
			elif bBUG_00000004_IS_STILL_ALIVE == True and returnCode == -14: # I had this error code on 07/09/2009 20:38 but I don't know yet what that means
				log('isMachineResponding : bug00000004 Unexpected return code : returnCode=%d, stdout="%s", stderr="%s" , machineName = %s' % (returnCode, stdout, stderr, machineName) )
				# don't stop the program until we understand bug00000004
			else:
				log('isMachineResponding : Unexpected return code : returnCode=%d, stdout="%s", stderr="%s" , machineName = %s' % (returnCode, stdout, stderr, machineName) )
				assert(False)
		return False

class ISqlDatabaseBackend(object):
	def __init__(self):
		pass

	@abc.abstractmethod
	def query(self, sql_query):
		"""
		:param str sql_query: the sql query to perform
		"""
		pass

class RemoteMysqlDb(ISqlDatabaseBackend):
	def __init__(self, db_server_fqdn, db_user, db_name):
		"""
		:param str db_server_fqdn: the fully qualified domain name of the server hosting the database, eg simpatix10.univ-rennes1.fr 
		:param str db_user: the user for accessing the inventory database, eg simpadb_reader
		:param str db_name: the name of the inventory database, eg simpadb
		"""
		self._db_server_fqdn = db_server_fqdn
		self._db_user = db_user
		self._db_name = db_name
		self._connect()
		
	def _connect(self):
		self._conn = MySQLdb.connect(self._db_server_fqdn, self._db_user, '', self._db_name)
		assert(self._conn)

	def query(self, sql_query):
		"""
		:param str sql_query: the sql query to perform
		"""
		self._conn.query( sql_query )
		rows = conn.store_result()
		return rows

		
class SqlFile(ISqlDatabaseBackend):
	def __init__(self, sql_file_path):
		"""
		:param str sql_file_path: the path of the sql file containing the inventory database
		"""
		self._sql_file_path = sql_file_path
		self._cur = None # sqlite cursor

		sqlite_db_path=':memory:'  # sqlite-specific special name for a file stored in memory. We could use something like '/tmp/simpadb.sqlite' here but this would make parsing really slow (1 minute instead of 1s), unless either :
		# - proper fix : group of INSERT statements are surrounded by BEGIN and COMMIT (see http://stackoverflow.com/questions/4719836/python-and-sqlite3-adding-thousands-of-rows)
		# - the file is stored on a solid state disk
		try:
			os.remove(sqlite_db_path)
		except:
			pass
		self._con = sqlite3.connect(sqlite_db_path)
		f = open(self._sql_file_path, 'r')
		sql = f.read() # watch out for built-in `str`
		#print(sql)
		self._cur = self._con.cursor()
		#print(mysql_to_sqlite(sql))
		self._cur.executescript(mysql_to_sqlite(sql))

	def query(self, sql_query):
		"""
		:param str sql_query: the sql query to perform
		"""
		pass
		self._cur.execute( sql_query )
		rows = self._cur.fetchall()
		return rows

		
class SqlDatabaseReader(object):
	
	def __init__(self, inv_provider):
		"""
		:param ISqlDatabaseBackend inv_provider: the input that provides the inventory data
		"""
		self._inv_provider = inv_provider

	def query(self, sql_query):
		"""
		performs a query on the sql database
		
		:param str sql_query: the sql query to perform
		"""
		return self._inv_provider.query(sql_query)

	def get_table_attr(self, table, key_name, key_value, attr_name ):
		"""
		reads the value of the fiven attribute of the given item in the given table
		
		:param str table: the name of the table to read
		:param str key_name: the name of the column that stores the id of the item to read
		:param str key_value: the id of the item to read
		:param str attr_name: the name of the attribute to read from the item
		"""
		attr_value = None
		rows = self.query("SELECT "+attr_name+" FROM "+table+" WHERE "+key_name+"='"+key_value+"'")
		if len(rows) > 0:
			attr_value = rows[0][0]
		return attr_value

def machineNameToMacAddress( machineName ):
	conn = MySQLdb.connect('simpatix10', 'simpadb_reader', '', 'simpadb')
	assert(conn)
	sqlQuery = """SELECT mac_address FROM ethernet_cards WHERE machine_name='"""+machineName+"""' AND type='normal'"""
	#print sqlQuery
	conn.query( sqlQuery )
	r=conn.store_result()
	row = r.fetch_row(0)
	assert( len(row) == 1 )
	#print 'row =', row
	macAddress = row[0][0]
	#print macAddress
	conn.close()
	return macAddress

def getLightOutManagementIpAddress( machineName ):
	"""
		the light out management ip of servers allows to talk to the server even when it's asleep
	"""
	conn = MySQLdb.connect('simpatix10', 'simpadb_reader', '', 'simpadb')
	assert(conn)
	sqlQuery = """SELECT ip_address_1,ip_address_2,ip_address_3,ip_address_4 FROM ethernet_cards WHERE machine_name='"""+machineName+"""' AND type='light_out_management'"""
	#print sqlQuery
	conn.query( sqlQuery )
	r=conn.store_result()
	row = r.fetch_row(0)
	assert( len(row) == 1 )
	#print 'row =', row
	ipAddress = ('%s.%s.%s.%s') % (row[0][0], row[0][1], row[0][2], row[0][3])
	#print macAddress
	conn.close()
	return ipAddress


def getClusterMachinesNames():
	clusterMachinesNames = []
	conn = MySQLdb.connect('simpatix10', 'simpadb_reader', '', 'simpadb')
	assert(conn)
	sqlQuery = """SELECT name FROM machines WHERE affectation='cluster'"""
	#print sqlQuery
	conn.query( sqlQuery )
	r=conn.store_result()
	rows = r.fetch_row(0)
	for row in rows:
		#print row
		clusterMachinesNames.append( row[0] )
	conn.close()
	return clusterMachinesNames

def machineSupportsIpmi( machineName ):
	if (machineName == 'simpatix') or (machineName == 'simpatix01' or (machineName == 'simpa-mac2')):
		# the command ipmitool sensor on simpatix doesn't work :
		# Unabled to establish a session with the BMC.
		# Command failed due to Unknown (0xFFFEF921) (0xFFFEF921)
		return False
	return True

def putToSleep( machineName ):
	# note : pmset must be executed as root
	(returnCode, stdout, stderr) = executeCommand([ 'ssh', machineName, 'pmset sleepnow' ])
	"""
	print returnCode
	print 'stdout :'
	print stdout
	print 'stderr :'
	print stderr
	"""
	assert( returnCode == 0 )
	# check if the command succeeded by looking at the output (that's the only way I found)
	f = StringIO.StringIO(stdout)
	line = f.readline()
	f.close()
	matchObj = re.match('^Sleeping now...', line)
	if matchObj:
		return True
	else:
		return False

def wakeUp(machineName):
	macAddress = machineNameToMacAddress( machineName )
	wake_on_lan(macAddress)
	return True

	
def isNonRespondingMachineSleeping(machineName):
	"""
		note : crappy method to detect if the machine is sleeping (if other methods are available, I would be very interested)
	"""
	wakeUp(machineName)
	time.sleep(120)
	if isMachineResponding( machineName ):
		putToSleep( machineName )
		time.sleep(30) # allow a little time to make sure the machine is ready to receive other wake on lan messages
		return True
	else:
		return False

if __name__ == '__main__':
	"""
	for i in range(30):
		machineName = 'simpatix%d' % (i+10)
		print 'lom ip of %s is %s' % (machineName, getLightOutManagementIpAddress(machineName))
	"""
	wakeUp('simpatix21')
	#print putToSleep('simpatix13')
	#print isNonRespondingMachineSleeping('simpatix13')