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process_pair.py
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process_pair.py
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import boto3
from boto3.dynamodb.types import TypeDeserializer
import json
import os
import shutil
import signal
import string
import sys
import time
import yaml
WAIT_SECONDS = 20
# taken from https://gist.github.com/seanh/93666
def format_filename(s):
valid_chars = "-_.() %s%s" % (string.ascii_letters, string.digits)
filename = ''.join(c for c in s if c in valid_chars)
filename = filename.replace(' ','_') # I don't like spaces in filenames.
return filename
# Compare the contents of 2 track manifests. Returns a tuple. The first
# element is a Boolean indicating whether checksums and track counts
# are identical.
#
# If False, the second parameter contains an error message.
#
# If True, the second parameter contains a dictionary of information to
# be logged to the database.
def compare_manifests(manifest1_filename, manifest2_filename):
manifest1 = json.loads(open(manifest1_filename, 'r').read())
manifest2 = json.loads(open(manifest2_filename, 'r').read())
if len(manifest1['tracks']) != len(manifest2['tracks']):
error = "manifests have different track counts: %d != %d\n" % (manifest1['tracks'], manifest2['tracks'])
return (False, error)
track_info = []
drive_info = [{
'device': manifest1['device'],
'drive_string': manifest1['drive_string'],
'start_time_utc': manifest1['start_time_utc'],
'end_time_utc': manifest1['end_time_utc'],
'time_in_seconds': manifest1['time_in_seconds'],
'read_performance': []
}, {
'device': manifest2['device'],
'drive_string': manifest2['drive_string'],
'start_time_utc': manifest2['start_time_utc'],
'end_time_utc': manifest2['end_time_utc'],
'time_in_seconds': manifest2['time_in_seconds'],
'read_performance': []
}]
for i in range(len(manifest1['tracks'])):
track1 = manifest1['tracks'][i]
track2 = manifest2['tracks'][i]
if track1['sha1'] != track2['sha1']:
error = "track %d has different checksums:\n"
error += " 1) %d bytes, sha1 = %s\n" % (track1['size'], track1['sha1'])
error += " 2) %d bytes, sha1 = %s" % (track2['size'], track2['sha1'])
return (False, error)
track_info.append({
'track_number': track1['track_number'],
'type': track1['type'],
'data_type': track1['data_type'],
'filename': track1['path'][track1['path'].rfind('/')+1:],
'size': track1['size'],
'sector_size': track1['sector_size'],
'sector_count': track1['sector_count'],
'sha1': track1['sha1']
})
drive_info[0]['read_performance'].append(track1['size_progress'])
drive_info[1]['read_performance'].append(track2['size_progress'])
return (True, (track_info, drive_info))
def organize_metadata(metadata):
db_item = {
'disc_title': metadata['disc_title'],
'disc_number': 1 if not metadata['disc_number'] else metadata['disc_number'],
'disc_count': 1 if not metadata['disc_count'] else metadata['disc_count']
}
if metadata['years']:
db_item['years'] = metadata['years']
if metadata['companies']:
db_item['companies'] = metadata['companies']
return(db_item)
# Returns a Boolean which is True if the response indicates success.
def aws_succeeded(resp):
if resp.get('ResponseMetadata') and resp['ResponseMetadata'].get('HTTPStatusCode') == 200:
return True
else:
return False
def process_directory(input_path, archive_dir, dbd_client):
serializer = boto3.dynamodb.types.TypeSerializer()
# make sure the input path exists
if not os.path.exists(input_path):
print(input_path + " does not exist")
return
# load metadata
metadata = json.loads(open(input_path + '/metadata.json').read())
# process 2 pairs
both_pairs_succeeded = True
for i in [1, 2]:
disc_key = 'disc' + str(i)
dir_name = metadata[disc_key]['disc_title']
if metadata[disc_key]['disc_count'] > 1:
dir_name += ' - disc ' + str(metadata[disc_key]['disc_number'])
dir_name = format_filename(dir_name)
full_output_path = archive_dir + '/' + dir_name
print("Processing '" + metadata[disc_key]['disc_title'] + "' into directory '" + full_output_path + "'")
if os.path.exists(full_output_path):
print("Output directory '%s' already exists; skipping item" % (full_output_path))
continue
# compare manifests
(status, data) = compare_manifests(
input_path + '/' + disc_key + '-dir1/track-manifest.json',
input_path + '/' + disc_key + '-dir2/track-manifest.json',
)
if status:
(tracks, drive_info) = data
# log the track info
db_item = organize_metadata(metadata[disc_key])
db_item['directory'] = dir_name
db_item['tracks'] = tracks
dbd_item = {k: serializer.serialize(v) for k,v in db_item.items()}
response = dbd_client.put_item(TableName='disc_table', Item=dbd_item)
if not aws_succeeded(response):
print("Received an AWS error:")
print(response)
both_pairs_succeeded = False
continue
# log the drive info dictionaries
for drive_item in drive_info:
drive_item['disc_directory'] = dir_name
dbd_item = {k: serializer.serialize(v) for k,v in drive_item.items()}
response = dbd_client.put_item(TableName='drive_table', Item=dbd_item)
if not aws_succeeded(response):
print("Received an AWS error:")
print(response)
both_pairs_succeeded = False
continue
# move the contents of one of the directories to its final spot
shutil.move(input_path + '/' + disc_key + '-dir1', full_output_path)
else:
both_pairs_succeeded = False
# if all the data underneath the top level directory was successfully
# processed, remove the top level directory
if both_pairs_succeeded:
print("removing directory '" + input_path + "'...")
shutil.rmtree(input_path)
# handle Ctrl-C:
force_cancel = False
def ctrlc_handler(signal_received, frame):
print('SIGINT or CTRL-C detected. Exiting gracefully')
sys.exit(0)
if __name__ == "__main__":
# re-route Ctrl-C:
signal.signal(signal.SIGINT, ctrlc_handler)
if len(sys.argv) < 2:
print("USAGE: process_pair.py <configuration file>")
sys.exit(1)
# parse the configuration file
config = yaml.safe_load(open(sys.argv[1], 'r').read())
archive_dir = config['Archive Directory']
# validate that the final archive directory exists and is writable
if not os.path.exists(archive_dir):
print(archive_dir + " does not exist")
sys.exit(1)
if not os.path.isdir(archive_dir):
print(archive_dir + " is not a directory")
sys.exit(1)
if not os.access(archive_dir, os.X_OK):
print(archive_dir + " is not writable")
sys.exit(1)
# connect to the AWS simple queue service
aws = config.get('AWS')
print("Connecting to SQS...")
sqs_client = boto3.client(
'sqs',
region_name=config['AWS']['Region'],
aws_access_key_id=config['AWS']['Access Key'],
aws_secret_access_key=config['AWS']['Secret Key']
)
pd_queue_url = sqs_client.get_queue_url(QueueName=config['AWS']['Queue'])['QueueUrl']
# connect to DynamoDB
print("Connecting to DynamoDB...")
dbd_client = boto3.client(
'dynamodb',
region_name=config['AWS']['Region'],
aws_access_key_id=config['AWS']['Access Key'],
aws_secret_access_key=config['AWS']['Secret Key']
)
# while there are messages in the queue, process directory messages
print("Waiting for messages...")
while True:
# get a message
sqs_response = sqs_client.receive_message(
QueueUrl=pd_queue_url,
WaitTimeSeconds=WAIT_SECONDS,
MaxNumberOfMessages=1
)
metadata = sqs_response['ResponseMetadata']
if metadata.get('HTTPStatusCode') != 200:
print("Message did not return HTTP status 200")
continue
if 'Messages' not in sqs_response:
continue
message = sqs_response['Messages'][0]
receipt_handle = message['ReceiptHandle']
# process the message
print("Processing " + message['Body'])
process_directory(message['Body'], archive_dir, dbd_client)
# remember to delete message
print("Processing finished; deleting message from queue...")
sqs_client.delete_message(
QueueUrl=pd_queue_url,
ReceiptHandle=receipt_handle
)
print("Waiting for messages...")