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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.message import ServiceMessage
from boto.services.servicedef import ServiceDef
from boto.pyami.scriptbase import ScriptBase
from boto.utils import get_ts
import time
import os
import mimetypes
class Service(ScriptBase):
# Time required to process a transaction
ProcessingTime = 60
def __init__(self, config_file=None, mimetype_files=None):
ScriptBase.__init__(self, config_file)
self.name = self.__class__.__name__
self.working_dir = boto.config.get('Pyami', 'working_dir')
self.sd = ServiceDef(config_file)
self.retry_count = self.sd.getint('retry_count', 5)
self.loop_delay = self.sd.getint('loop_delay', 30)
self.processing_time = self.sd.getint('processing_time', 60)
self.input_queue = self.sd.get_obj('input_queue')
self.output_queue = self.sd.get_obj('output_queue')
self.output_domain = self.sd.get_obj('output_domain')
if mimetype_files:
mimetypes.init(mimetype_files)
def split_key(key):
if key.find(';') < 0:
t = (key, '')
else:
key, type = key.split(';')
label, mtype = type.split('=')
t = (key, mtype)
return t
def read_message(self):
boto.log.info('read_message')
message = self.input_queue.read(self.processing_time)
if message:
boto.log.info(message.get_body())
key = 'Service-Read'
message[key] = get_ts()
return message
# retrieve the source file from S3
def get_file(self, message):
bucket_name = message['Bucket']
key_name = message['InputKey']
file_name = os.path.join(self.working_dir, message.get('OriginalFileName', 'in_file'))
boto.log.info('get_file: %s/%s to %s' % (bucket_name, key_name, file_name))
bucket = boto.lookup('s3', bucket_name)
key = bucket.new_key(key_name)
key.get_contents_to_filename(os.path.join(self.working_dir, file_name))
return file_name
# process source file, return list of output files
def process_file(self, in_file_name, msg):
return []
# store result file in S3
def put_file(self, bucket_name, file_path, key_name=None):
boto.log.info('putting file %s as %s.%s' % (file_path, bucket_name, key_name))
bucket = boto.lookup('s3', bucket_name)
key = bucket.new_key(key_name)
key.set_contents_from_filename(file_path)
return key
def save_results(self, results, input_message, output_message):
output_keys = []
for file, type in results:
if input_message.has_key('OutputBucket'):
output_bucket = input_message['OutputBucket']
else:
output_bucket = input_message['Bucket']
key_name = os.path.split(file)[1]
key = self.put_file(output_bucket, file, key_name)
output_keys.append('%s;type=%s' % (key.name, type))
output_message['OutputKey'] = ','.join(output_keys)
# write message to each output queue
def write_message(self, message):
message['Service-Write'] = get_ts()
message['Server'] = self.name
if os.environ.has_key('HOSTNAME'):
message['Host'] = os.environ['HOSTNAME']
else:
message['Host'] = 'unknown'
message['Instance-ID'] = self.instance_id
if self.output_queue:
boto.log.info('Writing message to SQS queue: %s' % self.output_queue.id)
self.output_queue.write(message)
if self.output_domain:
boto.log.info('Writing message to SDB domain: %s' % self.output_domain.name)
item_name = '/'.join([message['Service-Write'], message['Bucket'], message['InputKey']])
self.output_domain.put_attributes(item_name, message)
# delete message from input queue
def delete_message(self, message):
boto.log.info('deleting message from %s' % self.input_queue.id)
self.input_queue.delete_message(message)
# to clean up any files, etc. after each iteration
def cleanup(self):
pass
def shutdown(self):
on_completion = self.sd.get('on_completion', 'shutdown')
if on_completion == 'shutdown':
if self.instance_id:
time.sleep(60)
c = boto.connect_ec2()
c.terminate_instances([self.instance_id])
def main(self, notify=False):
self.notify('Service: %s Starting' % self.name)
empty_reads = 0
while self.retry_count < 0 or empty_reads < self.retry_count:
try:
input_message = self.read_message()
if input_message:
empty_reads = 0
output_message = ServiceMessage(None, input_message.get_body())
input_file = self.get_file(input_message)
results = self.process_file(input_file, output_message)
self.save_results(results, input_message, output_message)
self.write_message(output_message)
self.delete_message(input_message)
self.cleanup()
else:
empty_reads += 1
time.sleep(self.loop_delay)
except Exception:
boto.log.exception('Service Failed')
empty_reads += 1
self.notify('Service: %s Shutting Down' % self.name)
self.shutdown()
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