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Filename : sonofmmm.py
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# Copyright (c) 2006,2007 Mitch Garnaat http://garnaat.org/
#
# 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, dis-
# tribute, sublicense, and/or sell copies of the Software, and to permit
# persons to whom the Software is furnished to do so, subject to the fol-
# lowing 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 MERCHANTABIL-
# ITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
# SHALL THE AUTHOR 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 boto
from boto.services.service import Service
from boto.services.message import ServiceMessage
import os
import mimetypes

class SonOfMMM(Service):

    def __init__(self, config_file=None):
        super(SonOfMMM, self).__init__(config_file)
        self.log_file = '%s.log' % self.instance_id
        self.log_path = os.path.join(self.working_dir, self.log_file)
        boto.set_file_logger(self.name, self.log_path)
        if self.sd.has_option('ffmpeg_args'):
            self.command = '/usr/local/bin/ffmpeg ' + self.sd.get('ffmpeg_args')
        else:
            self.command = '/usr/local/bin/ffmpeg -y -i %s %s'
        self.output_mimetype = self.sd.get('output_mimetype')
        if self.sd.has_option('output_ext'):
            self.output_ext = self.sd.get('output_ext')
        else:
            self.output_ext = mimetypes.guess_extension(self.output_mimetype)
        self.output_bucket = self.sd.get_obj('output_bucket')
        self.input_bucket = self.sd.get_obj('input_bucket')
        # check to see if there are any messages queue
        # if not, create messages for all files in input_bucket
        m = self.input_queue.read(1)
        if not m:
            self.queue_files()

    def queue_files(self):
        boto.log.info('Queueing files from %s' % self.input_bucket.name)
        for key in self.input_bucket:
            boto.log.info('Queueing %s' % key.name)
            m = ServiceMessage()
            if self.output_bucket:
                d = {'OutputBucket' : self.output_bucket.name}
            else:
                d = None
            m.for_key(key, d)
            self.input_queue.write(m)

    def process_file(self, in_file_name, msg):
        base, ext = os.path.splitext(in_file_name)
        out_file_name = os.path.join(self.working_dir,
                                     base+self.output_ext)
        command = self.command % (in_file_name, out_file_name)
        boto.log.info('running:\n%s' % command)
        status = self.run(command)
        if status == 0:
            return [(out_file_name, self.output_mimetype)]
        else:
            return []

    def shutdown(self):
        if os.path.isfile(self.log_path):
            if self.output_bucket:
                key = self.output_bucket.new_key(self.log_file)
                key.set_contents_from_filename(self.log_path)
        super(SonOfMMM, self).shutdown()