Directory monitor

#!/usr/bin/python

# ----------------------------------------------------------------------------
# Copyright (c) 2010, Asim Ihsan
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
# ----------------------------------------------------------------------------

import os
import sys
import time
import pprint
import logging
import datetime
import glob
import shutil

# ----------------------------------------------------------------------------
#   Constants to change.
# ----------------------------------------------------------------------------

DIRECTORIES = [r"/tmp/dir1",
               r"/tmp/dir2",
              ]

DESTINATION = r"/Volumes/MONGOOSE/temp"

CHECK_INTERVAL = 15 * 60 # 15 minutes
RETRY_TIME = 30 * 60 # 30 minutes

START_TIME = datetime.time(hour=21, minute=0)
END_TIME = datetime.time(hour=23, minute=0)

# ----------------------------------------------------------------------------

# ----------------------------------------------------------------------------
#   Other constants, leave alone.
# ----------------------------------------------------------------------------

# ----------------------------------------------------------------------------

# create logger
logger = logging.getLogger("monitor_directory")
logger.setLevel(logging.DEBUG)

# create console handler and set level to debug
ch = logging.StreamHandler()
ch.setLevel(logging.DEBUG)

# create formatter
formatter = logging.Formatter("%(asctime)s - %(message)s")

# add formatter to ch
ch.setFormatter(formatter)

# add ch to logger
logger.addHandler(ch)

if __name__ == "__main__":
    logger.debug("making sure directories exist...")
    if any(not os.path.isdir(directory) for directory in DIRECTORIES):
        for directory in DIRECTORIES:
            if not os.path.isdir(directory):
                logger.error("directory '%s' does not exist" % (directory, ))
        sys.exit(1)
    if not os.path.isdir(DESTINATION):
        logger.error("destination directory '%s' does not exist" % (directory, ))
        sys.exit(1)
    logger.debug("all directories exist")

    logger.info("starting to monitor the following directories:\n'%s'" % (pprint.pformat(DIRECTORIES), ))
    while 1:
        time_now = datetime.datetime.now().time()
        if time_now < START_TIME or time_now > END_TIME:
            logger.debug("not the right time.  will try again later.")
            time.sleep(RETRY_TIME)
            continue
        logger.debug("correct time period. what's new?")
        remote_files = [(path, os.stat(path).st_mtime) for subdir in DIRECTORIES for path in glob.glob(os.path.join(subdir, "*"))]
        local_files = [(path, os.stat(path).st_mtime) for path in glob.glob(os.path.join(DESTINATION, "*"))]

        local_base_lookup = dict([(os.path.basename(path), m_time) for (path, m_time) in local_files])
        today = datetime.date.today()
        for (remote_path, remote_m_time) in remote_files:
            logger.debug("considering %s..." % (remote_path, ))
            # do not consider files that have not been modified today.
            if datetime.datetime.fromtimestamp(remote_m_time).date() != today:
                logger.debug("remote file %s too old" % (remote_path, ))
                continue

            if os.path.basename(remote_path) not in local_base_lookup:
                logger.debug("remote path %s does not exist locally. will copy." % (remote_path, ))
                dest = os.path.join(DESTINATION, os.path.basename(remote_path))
                if os.path.isdir(remote_path):
                    shutil.copytree(remote_path, dest)
                else:
                    shutil.copy2(remote_path, dest)
            #elif remote_m_time > local_base_lookup[os.path.basename(remote_path)]:
            #    logger.debug("remote path %s exists locally but is newer.  will overwrite." % (remote_path, ))
            #    if os.path.isdir(remote_path):
            #        shutil.rmtree(os.path.join(local_base_lookup[os.path.basename(remote_path)]))
            #    else:
            #        os.delete(os.path.join(local_base_lookup[os.path.basename(remote_path)]))
            #    if os.path.isdir(remote_path):
            #        shutil.copytree(remote_path, dest)
            #    else:
            #        shutil.copy2(remote_path, dest)

        logger.debug("finished this interval, sleeping...")
        time.sleep(CHECK_INTERVAL)