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remote_pyrax.py
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remote_pyrax.py
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# Methods to handle remote files
import datetime
import hashlib
import json
import os
import sys
import tempfile
import urllib2
import pyrax
import utility
has_progressbar = False
try:
import progressbar
has_progresbar = True
except ImportError:
pass
def remote_filename(filename):
return filename.replace('/', '~')
class RemoteContainer(object):
def __init__(self, name):
self.region, name = name.split('://')
self.basename = os.path.basename(name)
pyrax.set_setting('identity_type', 'rackspace')
with open(os.path.expanduser('~/.cloudfiles'), 'r') as f:
self.conf = json.loads(f.read())
pyrax.set_credentials(self.conf['access_key'],
self.conf['secret_key'],
region=self.region)
conn = pyrax.connect_to_cloudfiles(region=self.region.upper())
if self.region == 'dfw':
self.container_name = remote_filename(name)
else:
self.container_name = remote_filename('%s/%s' %(self.region, name))
container = conn.create_container(self.container_name)
for i in range(3):
try:
container.log_retention(True)
break
except:
pass
for info in conn.list_containers_info():
if info['name'] == self.container_name:
remote_total = info['bytes']
print ('%s Remote store %s contains %s in %d objects'
%(datetime.datetime.now(), self.region,
utility.DisplayFriendlySize(remote_total),
info['count']))
def get_directory(self, path):
return RemoteDirectory(self.region, self.container_name,
utility.path_join(self.basename, path))
class RemoteDirectory(object):
def __init__(self, region, container_name, path):
self.region = region
self.container_name = container_name
self.path = path
self.shalist = {}
self.remote_files = {}
conn = pyrax.connect_to_cloudfiles(region=self.region.upper())
container = conn.create_container(self.container_name)
if not self.path:
self.shalist_path = '.shalist'
prefix = None
else:
self.shalist_path = remote_filename(os.path.join(self.path,
'.shalist'))
prefix = remote_filename(self.path)
for i in range(3):
try:
self.shalist = json.loads(container.get_object(
remote_filename(self.shalist_path)).fetch())
break
except:
pass
print '%s Finding existing remote files' % datetime.datetime.now()
try:
marker = None
while True:
results = container.get_objects(prefix=prefix, marker=marker)
print ('%s ... %d results, marker %s'
%(datetime.datetime.now(), len(results), marker))
if not results:
break
for f in results:
marker = f.name
if f.name.endswith('.sha512'):
pass
elif f.name.endswith('.shalist'):
pass
else:
self.remote_files[f.name.replace('~', '/')] = True
except pyrax.exceptions.NoSuchObject:
pass
print ('%s Found %d existing files in %s'
%(datetime.datetime.now(), len(self.remote_files), self.region))
def listdir(self):
for ent in self.shalist.keys():
if ent in self.remote_files:
yield ent
# Directories don't appear in shalists
conn = pyrax.connect_to_cloudfiles(region=self.region.upper())
container = conn.create_container(self.container_name)
dirs = {}
marker = None
prefix = remote_filename(self.path) + '~'
while True:
results = container.get_objects(prefix=prefix, marker=marker)
if not results:
break
for f in results:
marker = f.name
if f.name.endswith('.shalist'):
subdir = f.name[len(prefix):]
if subdir and subdir != '.shalist':
dirs[subdir.split('~')[0]] = True
for d in dirs:
yield d
def get_file(self, path):
fullpath = utility.path_join(self.path, path)
r = RemoteFile(self.region, self.container_name, self.shalist,
self.remote_files, self.path, fullpath)
if fullpath in self.shalist:
r.cache['checksum'] = self.shalist[fullpath]
return r
def update_shalist(self, path, checksum):
self.shalist[path] = checksum
def write_shalist(self):
shafile = remote_filename(os.path.join(self.path, '.shalist'))
print '%s Updating %s with %s' %(datetime.datetime.now(), shafile,
self.path)
conn = pyrax.connect_to_cloudfiles(region=self.region.upper())
container = conn.create_container(self.container_name)
for i in range(3):
try:
try:
obj = container.delete_object(shafile)
except:
pass
obj = container.store_object(
shafile, json.dumps(self.shalist, sort_keys=True, indent=4))
break
except Exception as e:
print ('%s Upload FAILED TO UPLOAD CHECKSUM (%s)'
%(datetime.datetime.now(), e))
class RemoteFile(object):
def __init__(self, region, container_name, shalist, remote_files,
container_path, path):
self.region = region
self.container_name = container_name
self.shalist = shalist
self.remote_files = remote_files
self.path = path
self.container_path = container_path
self.cache = {}
def checksum(self):
if 'checksum' in self.cache:
return self.cache['checksum']
write_remote_checksum = False
conn = pyrax.connect_to_cloudfiles(region=self.region.upper())
container = conn.create_container(self.container_name)
try:
self.cache['checksum'] = container.get_object(
remote_filename(self.path + '.sha512')).fetch()
container.delete_object(
remote_filename(self.path + '.sha512'))
write_remote_checksum = True
print ('%s Found old style checksum for %s'
%(datetime.datetime.now(), self.path))
except:
print ('%s Missing checksum for %s'
%(datetime.datetime.now(), self.path))
local_file = self.fetch()
h = hashlib.sha512()
with open(local_file) as f:
d = f.read(1024 * 1204)
while d:
h.update(d)
d = f.read(1024 * 1024)
os.remove(local_file)
self.cache['checksum'] = h.hexdigest()
write_remote_checksum = True
if write_remote_checksum:
self.write_checksum(self.cache['checksum'])
return self.cache['checksum']
def size(self):
if 'size' in self.cache:
return self.cache['size']
print ('%s Querying the size of %s in %s'
%(datetime.datetime.now(), self.path, self.region))
conn = pyrax.connect_to_cloudfiles(region=self.region.upper())
container = conn.create_container(self.container_name)
obj = container.get_object(remote_filename(self.path))
self.cache['size'] = obj.total_bytes
return self.cache['size']
def isdir(self):
conn = pyrax.connect_to_cloudfiles(region=self.region.upper())
container = conn.create_container(self.container_name)
prefix = remote_filename(self.path) + '~'
results = container.get_objects(prefix=prefix)
if not results:
return False
return True
def islink(self):
return False
def exists(self):
return self.path in self.remote_files
def write_checksum(self, checksum):
self.shalist[self.path] = checksum
self.cache['checksum'] = checksum
shafile = remote_filename(os.path.join(self.container_path, '.shalist'))
print '%s Updating %s with %s' %(datetime.datetime.now(), shafile,
self.path)
conn = pyrax.connect_to_cloudfiles(region=self.region.upper())
container = conn.create_container(self.container_name)
for i in range(3):
try:
try:
obj = container.delete_object(shafile)
except:
pass
obj = container.store_object(
shafile, json.dumps(self.shalist, sort_keys=True, indent=4))
break
except Exception as e:
print ('%s Upload FAILED TO UPLOAD CHECKSUM (%s)'
%(datetime.datetime.now(), e))
def get_path(self):
return self.path
def store(self, local_path):
# Uploads sometimes timeout. Retry three times.
conn = pyrax.connect_to_cloudfiles(region=self.region.upper())
container = conn.create_container(self.container_name)
for i in range(3):
try:
obj = container.upload_file(
local_path, obj_name=remote_filename(self.path))
break
except Exception as e:
print '%s Upload FAILED (%s)' %(datetime.datetime.now(), e)
def fetch(self):
conn = pyrax.connect_to_cloudfiles(region=self.region.upper())
container = conn.create_container(self.container_name)
(local_fd, local_file) = tempfile.mkstemp()
os.close(local_fd)
url = container.get_object(remote_filename(self.path)).get_temp_url(
3600)
url = url.replace(' ', '%20')
print '%s Fetch URL is %s' %(datetime.datetime.now(), url)
maxval = self.size()
if maxval == 0:
# Special case for zero length remote files
with open(local_file, 'w') as f:
pass
return local_file
if has_progressbar:
widgets = ['Fetching: ', ' ', progressbar.Percentage(), ' ',
progressbar.Bar(marker=progressbar.RotatingMarker()),
' ', progressbar.ETA(), ' ',
progressbar.FileTransferSpeed()]
pbar = progressbar.ProgressBar(widgets=widgets,
maxval=maxval).start()
r = urllib2.urlopen(url)
count = 0
try:
with open(local_file, 'w') as f:
d = r.read(409600)
count += len(d)
while d:
f.write(d)
d = r.read(14096)
count += len(d)
if has_progressbar:
pbar.update(count)
finally:
if has_progressbar:
pbar.finish()
print '%s Fetch finished' % datetime.datetime.now()
r.close()
return local_file