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ftpdown.py
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ftpdown.py
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#!/usr/bin/env python
# encoding: utf-8
import os
import sys
import ftplib
import traceback
class FtpDownloader(object):
PATH_TYPE_UNKNOWN = -1
PATH_TYPE_FILE = 0
PATH_TYPE_DIR = 1
def __init__(self, host, user=None, passwd=None, port=21, timeout=10):
self.conn = ftplib.FTP(
host=host,
user=user,
passwd=passwd,
timeout=timeout
)
def dir(self, *args):
'''
by defualt, ftplib.FTP.dir() does not return any value.
Instead, it prints the dir info to the stdout.
So we re-implement it in FtpDownloader, which is able to return the dir info.
'''
info = []
cmd = 'LIST'
for arg in args:
if arg:
cmd = cmd + (' ' + arg)
self.conn.retrlines(cmd, lambda x: info.append(x.strip().split()))
return info
def tree(self, rdir=None, init=True):
'''
recursively get the tree structure of a directory on FTP Server.
args:
rdir - remote direcotry path of the FTP Server.
init - flag showing whether in a recursion.
'''
if init and rdir in ('.', None):
rdir = self.conn.pwd()
tree = []
tree.append((rdir, self.PATH_TYPE_DIR))
dir_info = self.dir(rdir)
for info in dir_info:
attr = info[0] # attribute
name = info[-1]
path = os.path.join(rdir, name)
if attr.startswith('-'):
tree.append((path, self.PATH_TYPE_FILE))
elif attr.startswith('d'):
if (name == '.' or name == '..'): # skip . and ..
continue
tree.extend(self.tree(rdir=path,init=False)) # recurse
else:
tree.append(path, self.PATH_TYPE_UNKNOWN)
return tree
def downloadFile(self, rfile, lfile):
'''
download a file with path %rfile on a FTP Server and save it to locate
path %lfile.
'''
ldir = os.path.dirname(lfile)
if not os.path.exists(ldir):
os.makedirs(ldir)
f = open(lfile, 'wb')
self.conn.retrbinary('RETR %s' % rfile, f.write)
f.close()
return True
def treeStat(self, tree):
numDir = 0
numFile = 0
numUnknown = 0
for path, pathType in tree:
if pathType == self.PATH_TYPE_DIR:
numDir += 1
elif pathType == self.PATH_TYPE_FILE:
numFile += 1
elif pathType == self.PATH_TYPE_UNKNOWN:
numUnknown += 1
return numDir, numFile, numUnknown
def downloadDir(self, rdir='.', ldir='.', tree=None,
errHandleFunc=None, verbose=True):
'''
download a direcotry with path %rdir on a FTP Server and save it to
locate path %ldir.
args:
tree - the tree structure return by function FtpDownloader.tree()
errHandleFunc - error handling function when error happens in
downloading one file, such as a function that writes a log.
By default, the error is print to the stdout.
'''
if not tree:
tree = self.tree(rdir=rdir, init=True)
numDir, numFile, numUnknown = self.treeStat(tree)
if verbose:
print 'Host %s tree statistic:' % self.conn.host
print '%d directories, %d files, %d unknown type' % (
numDir,
numFile,
numUnknown
)
if not os.path.exists(ldir):
os.makedirs(ldir)
ldir = os.path.abspath(ldir)
numDownOk = 0
numDownErr = 0
for rpath, pathType in tree:
lpath = os.path.join(ldir, rpath.strip('/').strip('\\'))
if pathType == self.PATH_TYPE_DIR:
if not os.path.exists(lpath):
os.makedirs(lpath)
elif pathType == self.PATH_TYPE_FILE:
try:
self.downloadFile(rpath, lpath)
numDownOk += 1
except Exception as err:
numDownErr += 1
if errHandleFunc:
errHandleFunc(err, rpath, lpath)
elif verbose:
print 'An Error occurred when downloading '\
'remote file %s' % rpath
traceback.print_exc()
print
if verbose:
print 'Host %s: %d/%d/%d(ok/err/total) files downloaded' % (
self.conn.host,
numDownOk,
numDownErr,
numFile
)
elif pathType == self.PATH_TYPE_UNKNOWN:
if verbose:
print 'Unknown type romote path got: %s' % rpath
if verbose:
print 'Host %s directory %s download finished:' % (
self.conn.host, rdir
)
print '%d directories, %d(%d failed) files, %d unknown type.' % (
numDir,
numFile,
numDownErr,
numUnknown
)
return numDir, numFile, numUnknown, numDownErr
if __name__ == '__main__':
import sys
import traceback
from pprint import pprint as pr
flog = open('err.log', 'wb')
def run(host):
try:
fd = FtpDownloader(
host=host,
user='test',
passwd='test',
port=21,
timeout=10
)
numDir, numFile, numUnknown, numDownErr = fd.downloadDir(
rdir='.',
ldir='download',
tree=None,
errHandleFunc=None,
verbose=True
)
flog.write(
'%s\nok\n'
'%d directories, %d(%d failed) files, %d unknown type\n\n\n' % (
host,
numDir,
numFile,
numDownErr,
numUnknown
)
)
except Exception as err:
traceback.print_exc()
flog.write(
'%s\nerror\n%s\n\n\n' % (
host,
traceback.format_exc()
)
)
pr(run(sys.argv[1]))
flog.close()