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backend_code.py
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backend_code.py
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import pycassa
import bisect
import hashlib
import sys
from pycassa.system_manager import *
from pycassa.pool import ConnectionPool
from pycassa.columnfamily import ColumnFamily
class keyspace:
"""It will contain all keyspace related opertions list,create,delete,select"""
server_ips = []
complete_list = {}
#------------------------------------------- Error testing ---------------------------------------------------------------------
# Input : machine_id = '10.3.3.20:9160' name = "keyspace_name"
# Output : True/False
def keyspace_contains(self,keyspace_name,column_family_name = ''):
"""Returns true if keyspace with given name and/or column family is on specified machine_id """
for key in keyspace.complete_list:
if (key == keyspace_name):
if(column_family_name != ''):
for cf in keyspace.complete_list[key]:
if(cf == column_family_name):
return True
return False
else:
return True
return False
# Input : machine_id = '10.3.3.20:9160' name = "keyspace_name"
# Output : True/False
def keyspace_columnfamily_list(self,machine_id):
"""Returns dictionary of all keyspace with their column family on specified machine_id """
sys = SystemManager(machine_id)
keyspace.complete_list.clear()
keyspace_list = sys.list_keyspaces()
for key in keyspace_list:
x=[]
result = sys.get_keyspace_column_families(key, use_dict_for_col_metadata=True)
for i in result:
x.append(i)
keyspace.complete_list[key] = x
sys.close()
return keyspace.complete_list
# Input : machine_ip = '10.3.3.20' ,machine_port = '9160'
# Output : ['10.3.3.20:9160','10.3.3.242:9160'] the latest updated list
def machine_add(self,machine_ip,machine_port ='9160'):
"""Add the machine to list(server_ips) which can be used in pool"""
entry = machine_ip +":"+ machine_port
keyspace.server_ips.append(entry)
return keyspace.server_ips
def machine_get_list(self):
return keyspace.server_ips
#************************************************** End ************************************************************************
#------------------------------------------- Keyspace----- ---------------------------------------------------------------------
# Input : machine_id = '10.3.3.20:9160'
# Output : ['TK1', 'system', 'testks'] List of all keyspace on that machine, not possible to pass list of server like in pool
def keyspace_get_list(self,machine_id):
"""Returns all keyspaces in form of list """
sys = SystemManager(machine_id)
keyspace_list = sys.list_keyspaces()
sys.close()
return keyspace_list
# Input : machine_id = '10.3.3.20:9160'
# Output : True
# Unsuccessful : False
def keyspace_create(self,machine_id,keyspace_name):
"""Create keyspace with given name on specified machine_id """
if (self.keyspace_contains(keyspace_name) == True):
print "Error : Keyspace with this name already exist."
return False
sys = SystemManager(machine_id)
print sys.create_keyspace(keyspace_name, SIMPLE_STRATEGY, {'replication_factor': '1'})
self.keyspace_columnfamily_list('localhost:9160')
sys.close()
return True
# Input : machine_id = '10.3.3.20:9160' name = "keyspace_name"
# Output : True
# Unsuccessful : False
def keyspace_delete(self,machine_id,keyspace_name):
"""Delete keyspace with given name on specified machine_id """
if (self.keyspace_contains(keyspace_name) == False):
print "Error : Keyspace with this name dosenot exist."
return False
sys = SystemManager(machine_id)
sys.drop_keyspace(keyspace_name)
self.keyspace_columnfamily_list('localhost:9160')
sys.close()
return True
#************************************************** End ************************************************************************
#------------------------------------------- Column Family ---------------------------------------------------------------------
# Input : machine_id = '10.3.3.20:9160'keyspace_name = 'ks1'
# Output : ['TestCF','Testcf2']
# Unsuccessful : False
def colum_family_list(self,machine_id,keyspace_name):
"""List all column family in a given keyspace """
if (self.keyspace_contains(keyspace_name) == False):
print "Error : Keyspace with this name dosenot exist."
return False
sys = SystemManager(machine_id)
result = sys.get_keyspace_column_families(keyspace_name, use_dict_for_col_metadata=True)
x=[]
for key in result:
x.append(key)
return x
# Input : machine_id = '10.3.3.20:9160',keyspace_name = 'ks1',column_family_name = 'cf1'
# Output : True
# Unsuccessful : False
def colum_family_create(self,machine_id,keyspace_name,column_family_name):
"""Create a column family in a given keyspace """
if (self.keyspace_contains(keyspace_name) == False):
print "Error : Keyspace with this name dosenot exist."
return False
sys = SystemManager(machine_id)
sys.create_column_family(keyspace_name, column_family_name)
self.keyspace_columnfamily_list('localhost:9160')
sys.close()
return True
# Input : machine_id = '10.3.3.20:9160',keyspace_name = 'ks1',column_family_name = 'cf1'
# Output : True
# Unsuccessful : False
def colum_family_delete(self,machine_id,keyspace_name,column_family_name):
"""Create a column family in a given keyspace """
if (self.keyspace_contains(keyspace_name,column_family_name) == False):
print "Error : Keyspace:column family could not be found."
return False
sys = SystemManager(machine_id)
sys.drop_column_family(keyspace_name, column_family_name)
self.keyspace_columnfamily_list('localhost:9160')
sys.close()
return True
# Important to specify buffer size else cassandra will try to load complete table in main memory which can crash system
# Input : machine_id = '10.3.3.20:9160',keyspace_name = 'ks1',column_family_name = 'cf1'
# Output : [ ('Key1', OrderedDict([('AGE', '24'), ('NAME', 'PRAJIT')])),('Key2', OrderedDict([('AGE', '23'), ('NAME', 'MAYUR')])) ]
# Unsuccessful : False
def colum_family_content(self,machine_id,keyspace_name,column_family_name):
"""Returns content of column family of given keyspace """
if (self.keyspace_contains(keyspace_name,column_family_name) == False):
print "Error : Keyspace:column family could not be found."
return False
pool = ConnectionPool(keyspace = keyspace_name, server_list = keyspace.server_ips, prefill = False)
col_fam = ColumnFamily(pool, column_family_name)
tmp_result = col_fam.get_range(start='', finish='',row_count=5,buffer_size=10)
result = []
for i in tmp_result:
result.append(i)
#print sum(1 for _ in result) # for count
return result
# Input : machine_id = '10.3.3.20:9160',keyspace_name = 'ks1',column_family_name = 'cf1'
# Output : True
# Unsuccessful : False
def colum_family_insert(self,machine_id,keyspace_name,column_family_name,user_content):
"""Insert into a column family for a given keyspace """
if (self.keyspace_contains(keyspace_name,column_family_name) == False):
print "Error : Keyspace:column family could not be found."
return False
pool = ConnectionPool(keyspace = keyspace_name, server_list = keyspace.server_ips, prefill=False)
col_fam = ColumnFamily(pool, column_family_name)
for content in user_content:
col_fam.insert(content,user_content[content])
#col_fam.insert('Key2', {'name':'mayur', 'age':'23'})
return True
# Input : machine_id = '10.3.3.20:9160',keyspace_name = 'ks1',column_family_name = 'cf1'
# Output : True
# Unsuccessful : False
def column_family_remove(self,machine_id,keyspace_name,column_family_name,key):
"""Remove a key from column family for a given keyspace """
if (self.keyspace_contains(keyspace_name,column_family_name) == False):
print "Error : Keyspace:column family could not be found."
return False
pool = ConnectionPool(keyspace = keyspace_name, server_list = keyspace.server_ips, prefill=False)
col_fam = ColumnFamily(pool, column_family_name)
col_fam.remove(key)
return True
def main():
print "You are in main"
key = keyspace()
#key.machine_add('10.3.3.20','9160')
#key.machine_add('10.3.3.242','9160')
key.machine_add('localhost','9160')
print key.keyspace_columnfamily_list('localhost:9160')
machine = 'localhost:9160'
while(True):
print 'Enter your choice: \n 1) List all keyspace \n 2) Create a keyspace \n 3) Delete a keyspace'
print ' 4) List all column family for a keyspace \n 5) Create a column family for keyspace'
print ' 6) Delete a column family from a keyspace \n 7) List content of a column family from keyspace'
print ' 8) Add content to a column family \n 9) Delete content from a column family'
print ' 10) List all machines in pool \n 11) Exit'
x = int(raw_input())
if (x==1) :
print "\n"
result = key.keyspace_get_list('localhost:9160')
elif (x==2) :
name = raw_input('Enter name for keyspace to be created :')
result = key.keyspace_create(machine,name)
elif (x==3) :
name = raw_input('Enter keyspace name to be deleted :')
result = key.keyspace_delete(machine,name)
elif (x==4) :
name = raw_input('Enter keyspace name :')
result = key.colum_family_list(machine,name)
elif (x==5) :
ks_name = raw_input('Enter keyspace name :')
cf_name = raw_input('Enter column family name :')
result = key.colum_family_create(machine,ks_name,cf_name)
elif (x==6) :
ks_name = raw_input('Enter keyspace name :')
cf_name = raw_input('Enter column family name :')
result = key.colum_family_delete(machine,ks_name,cf_name)
elif (x==7) :
ks_name = raw_input('Enter keyspace name :')
cf_name = raw_input('Enter column family name :')
result = key.colum_family_content(machine,ks_name,cf_name)
elif (x==8) :
ks_name = raw_input('Enter keyspace name :')
cf_name = raw_input('Enter column family name :')
content = raw_input('Enter content :')
inp = { 'Key1': {'name':'prajit', 'age':'24'} , 'Key2': {'name':'mayur', 'age':'23'} }
result = key.colum_family_insert( machine, ks_name, cf_name, inp)
elif (x==9) :
ks_name = raw_input('Enter keyspace name :')
cf_name = raw_input('Enter column family name :')
cf_key = raw_input('Enter key :')
result = key.column_family_remove(machine,ks_name,cf_name,cf_key)
elif (x==10) :
print 'List of machines :\n'
result = key.machine_get_list()
else :
print 'Exit........ing...........\n'
break
print result
raw_input('Press any key to continue...')
if __name__ == "__main__":
main()