161 lines
6.5 KiB
Python
161 lines
6.5 KiB
Python
# Copyright (c) 2006,2007 Mitch Garnaat http://garnaat.org/
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#
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# Permission is hereby granted, free of charge, to any person obtaining a
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# copy of this software and associated documentation files (the
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# "Software"), to deal in the Software without restriction, including
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# without limitation the rights to use, copy, modify, merge, publish, dis-
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# tribute, sublicense, and/or sell copies of the Software, and to permit
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# persons to whom the Software is furnished to do so, subject to the fol-
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# lowing conditions:
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#
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# The above copyright notice and this permission notice shall be included
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# in all copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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# OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABIL-
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# ITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
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# SHALL THE AUTHOR BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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# WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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# IN THE SOFTWARE.
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import boto
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from boto.services.message import ServiceMessage
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from boto.services.servicedef import ServiceDef
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from boto.pyami.scriptbase import ScriptBase
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from boto.utils import get_ts
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import time
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import os
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import mimetypes
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class Service(ScriptBase):
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# Time required to process a transaction
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ProcessingTime = 60
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def __init__(self, config_file=None, mimetype_files=None):
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super(Service, self).__init__(config_file)
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self.name = self.__class__.__name__
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self.working_dir = boto.config.get('Pyami', 'working_dir')
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self.sd = ServiceDef(config_file)
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self.retry_count = self.sd.getint('retry_count', 5)
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self.loop_delay = self.sd.getint('loop_delay', 30)
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self.processing_time = self.sd.getint('processing_time', 60)
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self.input_queue = self.sd.get_obj('input_queue')
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self.output_queue = self.sd.get_obj('output_queue')
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self.output_domain = self.sd.get_obj('output_domain')
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if mimetype_files:
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mimetypes.init(mimetype_files)
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def split_key(key):
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if key.find(';') < 0:
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t = (key, '')
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else:
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key, type = key.split(';')
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label, mtype = type.split('=')
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t = (key, mtype)
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return t
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def read_message(self):
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boto.log.info('read_message')
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message = self.input_queue.read(self.processing_time)
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if message:
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boto.log.info(message.get_body())
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key = 'Service-Read'
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message[key] = get_ts()
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return message
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# retrieve the source file from S3
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def get_file(self, message):
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bucket_name = message['Bucket']
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key_name = message['InputKey']
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file_name = os.path.join(self.working_dir, message.get('OriginalFileName', 'in_file'))
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boto.log.info('get_file: %s/%s to %s' % (bucket_name, key_name, file_name))
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bucket = boto.lookup('s3', bucket_name)
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key = bucket.new_key(key_name)
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key.get_contents_to_filename(os.path.join(self.working_dir, file_name))
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return file_name
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# process source file, return list of output files
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def process_file(self, in_file_name, msg):
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return []
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# store result file in S3
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def put_file(self, bucket_name, file_path, key_name=None):
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boto.log.info('putting file %s as %s.%s' % (file_path, bucket_name, key_name))
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bucket = boto.lookup('s3', bucket_name)
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key = bucket.new_key(key_name)
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key.set_contents_from_filename(file_path)
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return key
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def save_results(self, results, input_message, output_message):
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output_keys = []
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for file, type in results:
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if 'OutputBucket' in input_message:
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output_bucket = input_message['OutputBucket']
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else:
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output_bucket = input_message['Bucket']
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key_name = os.path.split(file)[1]
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key = self.put_file(output_bucket, file, key_name)
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output_keys.append('%s;type=%s' % (key.name, type))
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output_message['OutputKey'] = ','.join(output_keys)
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# write message to each output queue
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def write_message(self, message):
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message['Service-Write'] = get_ts()
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message['Server'] = self.name
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if 'HOSTNAME' in os.environ:
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message['Host'] = os.environ['HOSTNAME']
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else:
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message['Host'] = 'unknown'
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message['Instance-ID'] = self.instance_id
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if self.output_queue:
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boto.log.info('Writing message to SQS queue: %s' % self.output_queue.id)
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self.output_queue.write(message)
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if self.output_domain:
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boto.log.info('Writing message to SDB domain: %s' % self.output_domain.name)
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item_name = '/'.join([message['Service-Write'], message['Bucket'], message['InputKey']])
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self.output_domain.put_attributes(item_name, message)
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# delete message from input queue
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def delete_message(self, message):
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boto.log.info('deleting message from %s' % self.input_queue.id)
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self.input_queue.delete_message(message)
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# to clean up any files, etc. after each iteration
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def cleanup(self):
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pass
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def shutdown(self):
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on_completion = self.sd.get('on_completion', 'shutdown')
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if on_completion == 'shutdown':
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if self.instance_id:
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time.sleep(60)
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c = boto.connect_ec2()
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c.terminate_instances([self.instance_id])
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def main(self, notify=False):
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self.notify('Service: %s Starting' % self.name)
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empty_reads = 0
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while self.retry_count < 0 or empty_reads < self.retry_count:
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try:
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input_message = self.read_message()
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if input_message:
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empty_reads = 0
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output_message = ServiceMessage(None, input_message.get_body())
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input_file = self.get_file(input_message)
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results = self.process_file(input_file, output_message)
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self.save_results(results, input_message, output_message)
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self.write_message(output_message)
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self.delete_message(input_message)
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self.cleanup()
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else:
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empty_reads += 1
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time.sleep(self.loop_delay)
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except Exception:
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boto.log.exception('Service Failed')
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empty_reads += 1
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self.notify('Service: %s Shutting Down' % self.name)
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self.shutdown()
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