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Script to download multiple directories from remote FTP servers and copy these to local machines under multiple threads.

Python, 534 lines
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# Import statements
from xml.dom.ext.reader.Sax2 import FromXmlStream
from xml.xpath import Evaluate
import os, shutil, sys, pickle, threading, random, time, logging, ftplib

global logger, timer_start_dict, timer_end_dict, download_status

def make_backup(module_id):
	""" Function: Move the directory to  a backup location
	"""
	backup_location = config.find_location_for_module(module_id, 'backup_location') 
	stage_location = config.find_location_for_module(module_id, 'stage_location') 
	logger.info("["+module_id+"] Moving files " + stage_location + " to " + backup_location )
	try:
		if os.path.exists(backup_location):
			shutil.rmtree( backup_location, True )
		else:
			#This is to ensure that backup folder's path exists
			#and this path is reachable
			os.makedirs(backup_location)
			shutil.rmtree(backup_location, True )			
		if os.path.exists(stage_location):	
			shutil.move( stage_location , backup_location)
		else:
			logger.info("Location " + stage_location + " not present, no backup taken")
	except:
		logger.error("[" + module_id + "] Failed to remove:" + backup_location)
		logger.error("[" + module_id + "] Failed to remove Error:" + str(sys.exc_info()[0])+ " " + str(sys.exc_info()[1]))
		raise 
	else:
		os.makedirs(stage_location)
	

def copy_to_machine(machine_name, module_id, config):
	""" Function: Move a module installer files to a remote mahine from local location
	""" 
	remote_location = config.find_location_on_remote_machine(module_id, machine_name)
	local_module_location = config.find_location_for_module(module_id, 'stage_location')
	logger.info( "[" + module_id + "] Copying from " + local_module_location + " to " + remote_location)
	
	try:
		if os.path.isdir(remote_location):
			shutil.rmtree(remote_location, True )
	except:
		logger.error("[" + module_id + "] Failed to remove:" + remote_location + "on machine " + machine_name)
		logger.error("[" + module_id + "] Failed to remove Error:" + str(sys.exc_info()[0])+ " " + str(sys.exc_info()[1]))
	
	try:
		shutil.copytree(local_module_location, remote_location)
	except:
		logger.info("FAILURE: Copy of module " + module_id + "Failed on machine " + machine_name )
		logger.error("[" + module_id + "] Failed to copy:" + remote_location)
		logger.error("[" + module_id + "] Failed to copy Error:" + str(sys.exc_info()[0]) + " " + str(sys.exc_info()[1]))
		
def recur_get(ftp, ftp_loc, local_loc, module_id, config, ftp_pool):
    """ Function: Recursive function to get everything under the remote location ftp_loc 
    	and transfer these to the local location local_loc for module module_id
    	ftp_loc is the absolute location on the remove server however local_loc is the
    	absolute location on the local machine where the files/directories are to be created
    """ 
    local_ftp_loc = ftp_loc
    logger.debug( "Parameters for  recur_get ftp_loc: " + local_ftp_loc  )
    logger.debug( "Parameters for  recur_get local_loc: " + local_loc  )
    logger.debug( "FTP' CDing to location: " + local_ftp_loc  )
    ftp.cwd("/")		
    ftp.cwd(local_ftp_loc)
    for file in ftp.nlst():
        if file == "." or file == "..":
            continue
        try:
            logger.debug( "current position is " + ftp.pwd())
            logger.debug( "Taking up position at " + local_ftp_loc)
            ftp.cwd("/") 
            ftp.cwd(local_ftp_loc) 	
            logger.debug("Try CDing to directory :" + file  + "from" + local_ftp_loc)
            ftp.cwd(file)
            ftp.cwd('..')
            # A rather weired method to see if a file or directory exists on the remote server
            # Since unix and windows has different conventions for directory name, this is the only
            # platform independent method I could think of, suggestions welcome
            logger.debug( "Success, this is a directory: " + file  )
            stage_location_tmp =  os.path.join(local_loc, file)
            logger.debug( "Creating a local folder : " + stage_location_tmp  )
            try:
               os.makedirs(stage_location_tmp)
            except:
               logger.debug( "Already Exists: " + file + " [" + str(sys.exc_info()[1])+ "]"  )
            #The local_ftp_loc string is saved so that it does not get corrupted
            #when the function gets into the recursive loop
            str_for_ftp = local_ftp_loc
            recur_get(ftp, str_for_ftp + "/" + file , os.path.join(local_loc, file), module_id, config, ftp_pool)
            #original position of the ftp object is restored here
            ftp.cwd("/") 
            ftp.cwd(local_ftp_loc)              
        except ftplib.error_perm :
                logger.info( "File: " + file )
                logger.debug("[" + str(sys.exc_info()[1])+ "]")
                localfile = os.path.join(local_loc, file)
            	try:
                    ftp_pool.asynchronous_ftp_get( local_ftp_loc + "/" + file,localfile)
                except:
                    logger.error("Error reading from remote machine")
                    logger.error("Error:" + str(sys.exc_info()[0]) + " " + str(sys.exc_info()[1]))
                    raise                   
        except:	
            logger.info( "Other error " + file + " " + " [" + str(sys.exc_info()[1])+ "]"  )
            raise

def get_build(module_id, config):
    """  Function to get the module from the FTP Server
    """ 
    if config.find_keep_original(module_id).lower() == "yes":
	    make_backup(module_id)
    logger.info("["+module_id+"]FTP for this module started")
    machine_name = config.find_ftp_info_machine_name_for_module(module_id)
    uid = config.find_ftp_info_for_module(module_id, 'ftp_uid')
    pwd = config.find_ftp_info_for_module(module_id, 'ftp_password')
    ftp_loc = config.find_ftp_info_for_module(module_id, 'ftp_location')
    local_loc = config.find_location_for_module(module_id, 'stage_location')
    logger.debug("[" + module_id + "] Connecting to machine " + machine_name)
    ftp_pool = FTP_pool(module_id,config)
    local_loc = os.path.join(local_loc,os.path.basename(ftp_loc))
    os.makedirs(local_loc)
     
    try:
        ftp = ftplib.FTP(machine_name)
        ftp.login(uid, pwd)
        recur_get(ftp, ftp_loc, local_loc, module_id, config, ftp_pool)
        ftp.quit()
        ftp_pool.close_all()
    except:
        ftp_pool.close_all()
        logger.error("[" + module_id + "]Unable to access FTP location")
        logger.error("[" + module_id + "]Error:" + str(sys.exc_info()[0]) + " " + str(sys.exc_info()[1]))
        download_status[module_id] = "FAILED"
        raise
    else:
        logger.info("[" + module_id + "] FTP for module completed")
        download_status[module_id] = "SUCCESS"


def download_distribute(module_id, machine_list,config):
    """ Function to move the module to the list of machines
    """
    global timer_start_dict, timer_end_dict
    timer_start_dict[module_id] = time.time()
    get_build(module_id,config)
    timer_end_dict[module_id] = time.time()
    for machine_name in machine_list:
        copy_to_machine(machine_name, module_id,config )
	

class module_thread(threading.Thread):
    """ For each module that is downloaded a thread of this class is invoked, so 
        that each of the module that is to be downloaded is done in parallel
    """
    def __init__(self, module):
        self.module=module
        self.config=config
        self.machine_list=config.find_subscribed_machines_for_module(module)
        self.location=config.find_location_for_module( module, 'stage_location')
        threading.Thread.__init__(self)

    def run(self):
        try: 
          download_distribute(self.module, self.machine_list, self.config)    
        except: 
          logger.error("[" +self.module + "]FTP Process for this module terminated as error")
          logger.error("Error:" + str(sys.exc_info()[0]) + " " + str(sys.exc_info()[1]))
          download_status[module_id] = "FAILED"

class config_file_util:
    """ The class to handle all the configiration file related infornation
    """

    def __init__(self, config_file):
        fp = open(config_file,'r')
        self.dom = FromXmlStream(fp)
        fp.close()
        self.config_file=config_file
		
    def find_all_modules(self):
		module_id_list = []
		for t in Evaluate('module_list/module[@id]', self.dom.documentElement):
				module_id_list.append(str(Evaluate('@id', t)[0].nodeValue).strip())
		return module_id_list
        
    def find_keep_original(self, module_id):
        module_id_list = []
        t = Evaluate('module_list/module[@id=\''+module_id+'\']', self.dom.documentElement)
        return (str(Evaluate('@keep_original', t[0])[0].nodeValue).strip())
		
    def find_subscribed_machines_for_module(self,module_id):
        machine_name_list = []
        xpath = 'machine_list/machine/distribute_module/module_name[@id=\'' + module_id + '\']'
        for t in Evaluate(xpath, self.dom.documentElement):
        	m =  Evaluate('parent::*/parent::*', t)
        	machine_name_list.append(str(Evaluate('@machine_name', m[0])[0].nodeValue).strip())
        return machine_name_list
    
    def find_location_for_module(self, module_id, location):
    	xpath = 'module_list/module[@id=\'' + module_id + '\']'+'/'+location+'/text()'
    	return (Evaluate(xpath, self.dom.documentElement)[0].nodeValue).strip()

    def find_ftp_info_machine_name_for_module(self, module_id):
    	xpath = 'module_list/module[@id=\'' + module_id + '\']'+'/ftp_info'
    	m =  Evaluate(xpath, self.dom.documentElement)[0]
    	return (Evaluate('@machine_name', m)[0].nodeValue).strip()
		
    def find_ftp_info_for_module(self, module_id,info_tag):
    	xpath = 'module_list/module[@id=\'' + module_id + '\']'+'/ftp_info/' + info_tag + '/text()'
    	return (Evaluate(xpath, self.dom.documentElement)[0].nodeValue).strip()
                
    def find_location_on_remote_machine(self, module_id, machine_name):
    	xpath = 'machine_list/machine[@machine_name=\"' + machine_name + '\"]'+'/distribute_module/module_name[@id=\"' \
    	        + module_id +'\"]' 
    	m = Evaluate(xpath, self.dom.documentElement)
    	return (Evaluate('parent::*/local_location/text()', m[0])[0].nodeValue).strip()
		
    def find_config(self, config_id):
        xpath = 'config_list/config_item[@id=\"' + config_id + '\"]/text()' 
        m = Evaluate(xpath, self.dom.documentElement)
        return (m[0].nodeValue).strip()
        
# A thread class that would perform the ftp get asyncbronously.
class ftp_thread(threading.Thread):
    """ This thread that is invoked to FTP a single file.
    """
    global logger
    def __init__(self, ftp_session, ftp_session_id, remote_file, localfile, thread_pool_object ):
        self.ftp_session=ftp_session
        self.remote_file=remote_file
        self.localfile=localfile
        self.thread_pool_object = thread_pool_object
        self.ftp_session_id = ftp_session_id
        threading.Thread.__init__(self)

    def run(self):
        try:
            local_file = open(self.localfile, 'wb')
            logger.debug("[Session#"+str(self.ftp_session_id)+"]-Getting file " + self.localfile)
        except:
            logger.error("Error writing to local file")
            logger.error("Error:" + str(sys.exc_info()[0]) + " " + str(sys.exc_info()[1]))
            raise
        try: 
            buffer_size = int(config.find_config("BUFFER_SIZE"))*1024
            self.ftp_session.retrbinary('RETR ' + self.remote_file, local_file.write, buffer_size)   
        except: 
          logger.error("[Session#"+str(self.ftp_session_id)+"]-Error from remote location for file " + self.remote_file )
          logger.error("Error:" + str(sys.exc_info()[0]) + " " + str(sys.exc_info()[1]))
        self.thread_pool_object.release_ftp_session_id(self.ftp_session_id)
        local_file.close()
        
class FTP_pool:
    """
    	Class  for maintaining a Pool of Open FTP sessions
    """
    def __init__(self, module_id, config):
        self.number_of_connections = int(config.find_config("NUM_CONNECTION"))
        self.wait_for_connnection_time = int(config.find_config("FTP_TIMEOUT"))
        self.ftp_session_pool = []
        self.ftp_pool_lock = []
        self.module_id = module_id
        self.machine_name = config.find_ftp_info_machine_name_for_module(module_id)
        self.uid = config.find_ftp_info_for_module(module_id, 'ftp_uid')
        self.pwd = config.find_ftp_info_for_module(module_id, 'ftp_password')
        self.thread_list = []
        for i in range(self.number_of_connections):
            logger.debug("Creating FTP session " + str(i) +" "+ self.machine_name+" "+ self.uid+" "+self.pwd)
            ftp_session = ftplib.FTP(self.machine_name)
            ftp_session.login(self.uid, self.pwd)
            self.ftp_session_pool.append(ftp_session)
            self.ftp_pool_lock.append(threading.Lock())
          
    def __get_ftp_session_id_(self):
        """ Returns an unsued FTP session from the pool
        """
        wait_time = 0
        while True:
            for i in range(self.number_of_connections):
                if self.ftp_pool_lock[i].locked() == False:
                    self.ftp_pool_lock[i].acquire()
                    logger.debug("Request for ftp session got session #" + str(i) )
                    return i
            time.sleep(3)
            wait_time = wait_time + 3
            if wait_time < self.wait_for_connnection_time:
               logger.debug("No ftp sessions available..re-checking after wait..." )
               continue
            else:
               raise NameError, "TimeOut for FTP"
               
    def release_ftp_session_id(self, ftp_session_id):
        """ Method to release the FTP session back to the common pool 
        """
        self.ftp_pool_lock[ftp_session_id].release()

               
    def asynchronous_ftp_get(self,remote_file,localfile):
        """ This function is called to invoke a thread that will download the file
        """
        ftp_session_id = self.__get_ftp_session_id_()
        logger.debug("session allocated " + str(ftp_session_id))
        thread_id = ftp_thread( self.ftp_session_pool[ftp_session_id],ftp_session_id,remote_file, localfile, self)
        thread_id.start()
        self.thread_list.append(thread_id)
        
    def close_all(self):
        """ Close all FTP connections and threads
        """
        for tid in self.thread_list:
            logger.debug("Waiting for thread" + str(tid) )
            tid.join()
            logger.debug("thread" + str(tid) + " terminated")
        for i in range(self.number_of_connections):
            self.ftp_session_pool[i].quit()
        
            
"""
    End of Functions and Class definitions
"""
def main(command_line):
    """
    	Function invoked my __main__
    """
    usage = """
    myFTP : A tool to download files and directories from remote location
    Usage : myftp <config.xml>   
    """
    if len(command_line) < 2 :
        print usage
        sys.exit(1)
    else:
        config_file = command_line[1]
        
    # Read the configurations
    print "Reading config file :" + config_file
    global config, logger, timer_start_dict, timer_end_dict, download_status

    try:
        config = config_file_util(config_file)
    except:
        print "Configuration file may be corrupted, Quiting..."
        print str(sys.exc_info()[0])+ " " + str(sys.exc_info()[1])
        sys.exit(1)  
    
    # Execute the FTP Process for all modules
    thread_id_list = []
    timer_end_dict = {}
    timer_start_dict = {}
    download_status = {}
    logger_status = {"DEBUG":logging.DEBUG, "ERROR":logging.ERROR, \
                     "INFO":logging.INFO, "WARNING":logging.WARNING}
                     
    # Creating the Logging Mechanism
    try:
        logger = logging.getLogger('ftpbuild')
        hdlr = logging.FileHandler(config.find_config("LOG"),"wb")
        stderr_hdlr = logging.StreamHandler()
        formatter = logging.Formatter('%(asctime)s : %(levelname)s : %(message)s')
        hdlr.setFormatter(formatter)
        logger.addHandler(hdlr) 
        logger.addHandler(stderr_hdlr) 
        logger.setLevel(logger_status[config.find_config("LOG_LEVEL")])
        logger.info("========================================================")
        logger.info("=========== START OF FTP PROCESS  ======================")
        logger.info("========================================================")
    except:
        print "Unable to start logging, Quiting..."
        print str(sys.exc_info()[0])+ " " + str(sys.exc_info()[1])
        sys.exit(1)  

       
    for module_id in config.find_all_modules():
        timer_start_dict[module_id] = 0
        timer_end_dict[module_id] = 0
        download_status[module_id] = "SUCCESS"
        thread_id = module_thread(module_id)
        thread_id_list.append(thread_id)
        thread_id.start() 
        
    for tid in thread_id_list:
        tid.join()
    
    for module_id in config.find_all_modules():
        if download_status[module_id] == "SUCCESS":
            download_time = time.strftime("%d-%H:%M:%S",time.gmtime(timer_end_dict[module_id] - timer_start_dict[module_id]))
            logger.info(">>>>>>>>["+module_id + "] DOWNLOAD SUCCESSFUL<<<<<<<")
            logger.info(">>>>>>>>Download time for module ["+module_id + "] is " + download_time)
        else:
            logger.info("<<<<<<<<<<["+module_id + "] DOWNLOAD FAILED>>>>>>>")
            
    logger.info("========================================================")
    logger.info("=========== END OF FTP PROCESS  ========================")
    logger.info("========================================================")

if __name__ == "__main__":
    main(sys.argv)

        
------------------------------------------------------------------------
Sample XML file
-------------------
<?xml version="1.0"?>

<!DOCTYPE download [
<!ELEMENT download (config_list, module_list, machine_list )>
<!ELEMENT config_list (config_item+)>
<!ELEMENT config_item (#PCDATA)>
<!ELEMENT module_list (module+)>
<!ELEMENT machine_list (machine*)>
<!ELEMENT machine (distribute_module+)>
<!ELEMENT distribute_module (module_name, local_location)>
<!ELEMENT module_name (#PCDATA)>
<!ELEMENT local_location (#PCDATA)>
<!ELEMENT module (alias_name_list, ftp_info, stage_location, backup_location)>
<!ELEMENT alias_name_list (alias_name)>
<!ELEMENT alias_name (#PCDATA)>
<!ELEMENT ftp_info (ftp_uid,ftp_password,ftp_location)>
<!ELEMENT ftp_uid (#PCDATA)>
<!ELEMENT ftp_password (#PCDATA)>
<!ELEMENT ftp_location (#PCDATA)>
<!ELEMENT backup_location (#PCDATA)>
<!ELEMENT stage_location (#PCDATA)>

<!ATTLIST module id CDATA #REQUIRED common_name CDATA #REQUIRED install_depot_name CDATA #REQUIRED keep_original CDATA #REQUIRED keep_history CDATA #REQUIRED>
<!ATTLIST module_name id CDATA #REQUIRED>
<!ATTLIST machine machine_name CDATA #REQUIRED>
<!ATTLIST ftp_info machine_name CDATA #REQUIRED>
<!ATTLIST config_item id CDATA #REQUIRED description CDATA #REQUIRED>
<!ATTLIST ftp_password encryption (plaintext|base64) #IMPLIED>
]> 
<download>
<!-- List of configiurations items, these are self explanatory-->
<config_list>
	<config_item id = "LOG" description="The location and file where the log file for this process is stored">
		c:\docume~1\sasdemo\locals~1\temp\ftp.log
	</config_item>
	<config_item id = "NUM_CONNECTION" description="number of connections to be maintained in the pool">
		35
	</config_item>
	<config_item id = "FTP_TIMEOUT" description="number of seconds to wait for a FTP session">
		21600
	</config_item>
	<!-- Logging levels "DEBUG" "ERROR""INFO""WARNING" -->
	<config_item id = "LOG_LEVEL" description="What is the level of logging required INFO/ERROR/WARNING">
			INFO
	</config_item>	
	<config_item id = "BUFFER_SIZE" description="Size of the file buffer size used by the FTP in kilo bytes">
			16
	</config_item>	
	
</config_list>
<!-- module_list: Describes the module(s) ( directory structure on your server machine) to be downloaded -->
<module_list>
<!-- module_id: A unique name for the module
     install_depit_name: the directory name of this module in the server
     keep_original: if this module is already present on your local machine,'yes' would move this directory to 
                    .org folder
     keep_history: not yet implemented-->

	<module id = "TEST" common_name= "test" install_depot_name = "test" keep_original = "yes" keep_history = "no">
		<!--List of alias names that you can specify for this module name, not yet implemented -->
		<alias_name_list>
			<alias_name>
			</alias_name>
		</alias_name_list>
		<!--Name of the machine you are trying to FTP the module from -->
		<ftp_info machine_name = "remte_server_name.domain.com">
			<ftp_uid>my_user_id</ftp_uid>
			<ftp_password>my_password</ftp_password>
			<!-- Location on the remote machine where the module is located-->
			<ftp_location>/Work</ftp_location>
		</ftp_info>
		<!--stage_location: location in the local machine where the module will be downloaded -->
		<stage_location>c:\docume~1\sasdemo\locals~1\temp\target</stage_location>
		<!--backup_location: if the module TEST is already downloaded at the stage_location, backup_location
		                     refers to which location the already downloaded module should be moved-->
		<backup_location>c:\docume~1\sasdemo\locals~1\temp\backup</backup_location>
	</module>
	<module id = "TEST2" common_name= "test" install_depot_name = "test" keep_original = "yes" keep_history = "no">
		<!--List of alias names that you can specify for this module name, not yet implemented -->
		<alias_name_list>
			<alias_name>
			</alias_name>
		</alias_name_list>
		<!--Name of the machine you are trying to FTP the module from -->
		<ftp_info machine_name = "remte_server_name.domain.com">
			<ftp_uid>my_user_id</ftp_uid>
			<ftp_password>my_password</ftp_password>
			<!-- Location on the remote machine where the module is located i.e. on the remote machine the 
			     files are located at /worl/TEST2 so under ftp_location the location is mentioned as /work-->
			<ftp_location>/Work</ftp_location>
		</ftp_info>
		<!--stage_location: location in the local machine where the module will be downloaded -->
		<stage_location>c:\docume~1\sasdemo\locals~1\temp\target</stage_location>
		<!--backup_location: if the module TEST is already downloaded at the stage_location, backup_location
												 refers to which location the already downloaded module should be moved-->
		<backup_location>c:\docume~1\sasdemo\locals~1\temp\backup</backup_location>
	</module>

</module_list>
<!-- Machine_list: the list of machines on which the modules downloaded above is to be copied -->
<machine_list>
	<!-- machine_name: refers to the machine(s) on which this module is to be copied-->
	<machine machine_name= "one_machine_on_my_network">
	  <!-- distribute_module: the list of module(s) ( mentioned under module_name ) that beeds to be transfered-->
		<distribute_module >
			<module_name id = "TEST"/>
			<!-- local_location: the location on the machine to copy the files to.-->
			<local_location>\\one_machine_on_my_network\location_to_copy_test</local_location>
		</distribute_module>
		<distribute_module >
			<module_name id = "TEST2"/>
			<!-- local_location: the location on the machine to copy the files to.-->
			<local_location>\\one_machine_on_my_network\location_to_copy_test</local_location>
		</distribute_module>
	</machine>
	<machine machine_name= "two_machine_on_my_network">
	  <!-- distribute_module: the list of module(s) ( mentioned under module_name ) that beeds to be transfered-->
		<distribute_module >
			<module_name id = "TEST"/>
			<!-- local_location: the location on the machine to copy the files to.-->
			<local_location>\\one_machine_on_my_network\location_to_copy_test</local_location>
		</distribute_module>
		<distribute_module >
			<module_name id = "TEST2"/>
			<!-- local_location: the location on the machine to copy the files to.-->
			<local_location>\\two_machine_on_my_network\location_to_copy_test</local_location>
		</distribute_module>
	</machine>
</machine_list>
</download>        
        

This script expects an XML file with details on the directories that requires to be downloaded from remote FTP servers. The script does a recursive FTP of files within the directory and this FTP of each file is done in parallel, each file within the directory being processed by a seperate thread. The script is also capable of downloading directories from multiple FTP servers at the same time, the directories on each machine being handled by different threads. For example, directory test1 is residing on host ftp_server1 and directory test2 is residing on ftp_server2, these two directories can be downloaded in paralled by this script. The script keeps a backup of the directory if its already present on the local machine. Can be used for scheduled download of directories on a regular uninturrupted basis.

1 comment

Grant Paton-Simpson 14 years, 3 months ago  # | flag

Alternative to deprecated FromXmlStream. According to http://www.xml.com/pub/a/2002/12/11/py-xml.html the FromXmlStream function is deprecated (as are others like it). So we apparently shouldn't use the form:

from xml.dom.ext.reader.Sax2 import FromXmlStream

doc = FromXmlStream(sys.stdin)

But rather:

from xml.dom.ext.reader import Sax2

reader = Sax2.Reader()

doc = reader.fromStream(sys.stdin)

The reader object apparently has the advantage of being reusable, with some savings in overhead.

Created by Rajesh Kazhankodath on Mon, 30 Aug 2004 (PSF)
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