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#!/usr/bin/python
# -*- coding: latin1 -*-
### Copyright (C) 2011 Damon Lynch <damonlynch@gmail.com>
### This program is free software; you can redistribute it and/or modify
### it under the terms of the GNU General Public License as published by
### the Free Software Foundation; either version 2 of the License, or
### (at your option) any later version.
### This program is distributed in the hope that it will be useful,
### but WITHOUT ANY WARRANTY; without even the implied warranty of
### MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
### GNU General Public License for more details.
### You should have received a copy of the GNU General Public License
### along with this program; if not, write to the Free Software
### Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
import os
import multiprocessing
import gio
import gtk
import pyexiv2
import rpdmultiprocessing as rpdmp
import rpdfile
import logging
logger = multiprocessing.get_logger()
# python whitespace is significant - don't remove the leading whitespace on
# the second line
file_attributes = "standard::name,standard::display-name,\
standard::type,standard::size,time::modified,access::can-read,id::file"
class Scan(multiprocessing.Process):
"""Scans the given path for files of a specified type.
Returns results in batches, finishing with a total of the size of all the
files in bytes.
"""
def __init__(self, path, batch_size, generate_folder, results_pipe,
terminate_queue, run_event):
"""Setup values needed to conduct the scan.
'path' is a string of the path to be scanned, which is passed to gio.
'batch_size' is the number of files that should be sent back to the
calling function at one time.
'results_pipe' is a connection on which to send the results.
'terminate_queue' is a queue whose sole purpose is to notify the
process that it should terminate and not return any results.
'run_event' is an Event that is used to temporarily halt execution.
"""
multiprocessing.Process.__init__(self)
self.path = path
self.results_pipe = results_pipe
self.terminate_queue = terminate_queue
self.run_event = run_event
self.batch_size = batch_size
self.generate_folder = generate_folder
self.counter = 0
self.files = []
self.file_type_counter = rpdfile.FileTypeCounter()
def _gio_scan(self, path, file_size_sum):
"""recursive function to scan a directory and its subdirectories
for photos and possibly videos"""
children = path.enumerate_children(file_attributes)
for child in children:
# pause if instructed by the caller
self.run_event.wait()
if not self.terminate_queue.empty():
x = self.terminate_queue.get()
# terminate immediately
logger.info("terminating scan...")
self.files = []
return None
# only collect files and scan in directories we can actually read
# cannot assume that users will download only from memory cards
if child.get_attribute_boolean(gio.FILE_ATTRIBUTE_ACCESS_CAN_READ):
file_type = child.get_file_type()
name = child.get_name()
if file_type == gio.FILE_TYPE_DIRECTORY:
file_size_sum = self._gio_scan(path.get_child(name),
file_size_sum)
if file_size_sum is None:
return None
elif file_type == gio.FILE_TYPE_REGULAR:
ext = os.path.splitext(name)[1].lower()[1:]
file_type = rpdfile.file_type(ext)
if file_type is not None:
# count how many files of each type are included
# e.g. photo, video
self.file_type_counter.add(file_type)
self.counter += 1
display_name = child.get_display_name()
size = child.get_size()
modification_time = child.get_modification_time()
file_id = child.get_attribute_string(
gio.FILE_ATTRIBUTE_ID_FILE)
scanned_file = rpdfile.get_rpdfile(ext,
name,
display_name,
path.get_path(),
size,
modification_time,
self.pid,
file_id)
if self.generate_folder:
# this dramatically slows scanning speed, and it
# is unlikely this will be called this early in the
# workflow
scanned_file.read_metadata()
self.files.append(scanned_file)
if self.counter == self.batch_size:
# send batch of results
self.results_pipe.send((rpdmp.CONN_PARTIAL,
self.files))
self.files = []
self.counter = 0
file_size_sum += size
return file_size_sum
def run(self):
"""start the actual scan."""
source = gio.File(self.path)
try:
size = self._gio_scan(source, 0)
except gio.Error, inst:
logger.error("Error while scanning %s: %s", self.path, inst)
size = None
if size is not None:
if self.counter > 0:
# send any remaining results
self.results_pipe.send((rpdmp.CONN_PARTIAL, self.files))
self.results_pipe.send((rpdmp.CONN_COMPLETE, (size,
self.file_type_counter, self.pid)))
self.results_pipe.close()
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