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ExternalTable.py
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ExternalTable.py
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#!/usr/bin/python
# -*- coding: utf-8 -*-
from DirectoryManagement import DirectoryManagement
import logging, random, string
from Utils import checkOptionsGivenByTheUser
from Constants import *
class ExternalTable (DirectoryManagement):
'''
Allow the user to read file thanks to external tables
'''
def __init__(self,args):
'''
Constructor
'''
logging.debug("ExternalTable object created")
DirectoryManagement.__init__(self,args)
self.tableName = self.__generateRandomString__()
self.__setDirectoryName__()
self.ERROR_EXTERNAL_TABLE_WITH_WRITE = "ORA-30653: "
self.ERROR_EXTERNAL_TABLE_READ ="ORA-29400: "
self.ERROR_ODCIEXTTABLEOPEN="ORA-29913: "
def __createTableForReadFile__(self,remoteNameFile):
'''
Create table name with, for exemple:
CREATE TABLE rf1 (id NUMBER PRIMARY KEY, path VARCHAR(255) UNIQUE, ot_format VARCHAR(6));
'''
logging.info('Create the table: {0}'.format(self.tableName))
query = "CREATE TABLE {0} (line varchar2(256)) ORGANIZATION EXTERNAL (TYPE oracle_loader DEFAULT DIRECTORY {1} ACCESS PARAMETERS ( RECORDS DELIMITED BY NEWLINE BADFILE 'bad_data.bad' NOLOGFILE FIELDS TERMINATED BY ',' MISSING FIELD VALUES ARE NULL REJECT ROWS WITH ALL NULL FIELDS (line)) LOCATION ('{2}')) PARALLEL REJECT LIMIT 0 NOMONITORING".format(self.tableName, self.directoryName, remoteNameFile)
response = self.__execThisQuery__(query=query,isquery=False)
if isinstance(response,Exception) :
logging.info('Error with the SQL request {0}: {1}'.format(query,str(response)))
return response
else : return True
def __createTableForExec__(self,remoteNameFile):
'''
Create a table in order to execute a command
'''
logging.info('Create the table: {0}'.format(self.tableName))
query = """CREATE TABLE {0} ( line NUMBER , text VARCHAR2(4000)) ORGANIZATION EXTERNAL ( TYPE ORACLE_LOADER DEFAULT DIRECTORY {1} ACCESS PARAMETERS ( RECORDS DELIMITED BY NEWLINE NOLOGFILE PREPROCESSOR {1}: '{2}' FIELDS TERMINATED BY WHITESPACE ( line RECNUM , text POSITION(1:4000)) ) LOCATION ('{2}') ) REJECT LIMIT UNLIMITED""".format(self.tableName, self.directoryName, remoteNameFile)
response = self.__execThisQuery__(query=query,isquery=False)
if isinstance(response,Exception) :
logging.info('Error with the SQL request {0}: {1}'.format(query,str(response)))
return response
else : return True
def __dropTable__(self):
'''
Drop the table with, for exemple
DROP TABLE my_table PURGE;
'''
logging.info('Drop the table: {0}'.format(self.tableName))
query = "DROP TABLE {0} PURGE".format(self.tableName)
response = self.__execThisQuery__(query=query,isquery=False)
if isinstance(response,Exception) :
logging.info('Error with the SQL request {0}: {1}'.format(query,str(response)))
return response
else : return True
def getFile (self,remotePath, remoteNameFile, localFile):
'''
Create the localFile file containing data stored on the remoteNameFile (stored in the remotePath)
'''
data = ""
logging.info("Copy the {0} remote file (stored in {1}) to {2}".format(remoteNameFile,remotePath,localFile))
status = self.__createOrRemplaceDirectory__(remotePath)
if isinstance(status,Exception): return status
status = self.__createTableForReadFile__(remoteNameFile)
if isinstance(status,Exception): return status
request = "select line from {0}".format(self.tableName)
response = self.__execThisQuery__(query=request,ld=['line'])
if isinstance(response,Exception):
logging.info('Error with the SQL request {0}: {1}'.format(request,response))
status = self.__dropDirectory__()
status = self.__dropTable__()
return response
else :
for l in response:
data += l['line']+'\n'
status = self.__dropDirectory__()
status = self.__dropTable__()
return data
def execute (self, remotePath, remoteNameFile):
'''
Execute a command
'''
logging.info("Execute the {0} command stored stored in {1}".format(remoteNameFile,remotePath))
status = self.__createOrRemplaceDirectory__(remotePath)
if isinstance(status,Exception): return status
status = self.__createTableForExec__(remoteNameFile)
if isinstance(status,Exception): return status
request = "select line from {0}".format(self.tableName)
response = self.__execThisQuery__(query=request, ld=['line'])
if isinstance(response,Exception):
logging.info('Error with the SQL request {0}: {1}'.format(request,response))
status = self.__dropDirectory__()
status = self.__dropTable__()
return response
else :
logging.info("{0} command executed without errors".format(remoteNameFile))
status = self.__dropDirectory__()
status = self.__dropTable__()
return response
def testAll(self):
'''
Test all functions
'''
folder = self.__generateRandomString__()
self.args['print'].subtitle("External table to read files ?")
logging.info("Simulate the file reading in the {0} folder thanks to an external table".format(folder))
status = self.getFile(remotePath=folder, remoteNameFile='data.txt', localFile="test.txt")
if (status == True or self.ERROR_EXTERNAL_TABLE_WITH_WRITE in str(status) or self.ERROR_EXTERNAL_TABLE_READ in str(status)):
self.args['print'].goodNews("OK")
else :
self.args['print'].badNews("KO")
self.args['print'].subtitle("External table to execute system commands ?")
logging.info("Simulate the file execution thanks to an external table")
status = self.execute (remotePath=folder, remoteNameFile='test')
if (status == True or self.ERROR_EXTERNAL_TABLE_WITH_WRITE in str(status) or self.ERROR_EXTERNAL_TABLE_READ in str(status)):
self.args['print'].goodNews("OK")
else :
self.args['print'].badNews("KO")
def runExternalTableModule (args):
'''
Run the External Table module
'''
status = True
if checkOptionsGivenByTheUser(args,["test-module","getFile","exec"]) == False : return EXIT_MISS_ARGUMENT
externalTable = ExternalTable(args)
status = externalTable.connection(stopIfError=True)
if args['test-module'] == True :
args['print'].title("Test if the External Table module can be used")
status = externalTable.testAll()
#Option 1: getFile
if args['getFile'] != None:
args['print'].title("Read the {0} file stored in the {1} path".format(args['getFile'][1],args['getFile'][0]))
data = externalTable.getFile (remotePath=args['getFile'][0], remoteNameFile=args['getFile'][1], localFile=args['getFile'][2])
if isinstance(data,Exception):
args['print'].badNews("There is an error: {0}".format(data))
else:
args['print'].goodNews("Data stored in the remote file {0} stored in {1}".format(args['getFile'][1],args['getFile'][0]))
print(data)
#Option 2: exec a script or command
if args['exec'] != None:
args['print'].title("Execute the {0} command stored in the {1} path".format(args['exec'][1],args['exec'][0]))
data = externalTable.execute (remotePath=args['exec'][0], remoteNameFile=args['exec'][1])
if isinstance(data,Exception):
args['print'].badNews("There is an error: {0}".format(data))
else:
args['print'].goodNews("The {0} command stored in {1} has been executed (normally)".format(args['exec'][1],args['exec'][0]))