Current File : //lib/python3/dist-packages/duplicity/backends/pcabackend.py
# -*- Mode:Python; indent-tabs-mode:nil; tab-width:4; encoding:utf-8 -*-
#
# Copyright 2013 Matthieu Huin <mhu@enovance.com>
# Copyright 2017 Xavier Lucas <xavier.lucas@corp.ovh.com>
#
# This file is part of duplicity.
#
# Duplicity is free software; you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by the
# Free Software Foundation; either version 2 of the License, or (at your
# option) any later version.
#
# Duplicity is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with duplicity; if not, write to the Free Software Foundation,
# Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
import os
import time
import duplicity.backend
from duplicity import log
from duplicity.errors import BackendException
class PCABackend(duplicity.backend.Backend):
"""
Backend for OVH PCA
"""
def __init__(self, parsed_url):
duplicity.backend.Backend.__init__(self, parsed_url)
try:
from swiftclient import Connection
from swiftclient import ClientException
except ImportError as e:
raise BackendException(
f"""PCA backend requires the python-swiftclient library.
Exception: {str(e)}"""
)
self.resp_exc = ClientException
self.conn_cls = Connection
conn_kwargs = {}
# if the user has already authenticated
if "PCA_PREAUTHURL" in os.environ and "PCA_PREAUTHTOKEN" in os.environ:
conn_kwargs["preauthurl"] = os.environ["PCA_PREAUTHURL"]
conn_kwargs["preauthtoken"] = os.environ["PCA_PREAUTHTOKEN"]
else:
if "PCA_USERNAME" not in os.environ:
raise BackendException("PCA_USERNAME environment variable " "not set.")
if "PCA_PASSWORD" not in os.environ:
raise BackendException("PCA_PASSWORD environment variable " "not set.")
if "PCA_AUTHURL" not in os.environ:
raise BackendException("PCA_AUTHURL environment variable " "not set.")
conn_kwargs["user"] = os.environ["PCA_USERNAME"]
conn_kwargs["key"] = os.environ["PCA_PASSWORD"]
conn_kwargs["authurl"] = os.environ["PCA_AUTHURL"]
os_options = {}
if "PCA_AUTHVERSION" in os.environ:
conn_kwargs["auth_version"] = os.environ["PCA_AUTHVERSION"]
if os.environ["PCA_AUTHVERSION"] == "3":
if "PCA_USER_DOMAIN_NAME" in os.environ:
os_options.update({"user_domain_name": os.environ["PCA_USER_DOMAIN_NAME"]})
if "PCA_USER_DOMAIN_ID" in os.environ:
os_options.update({"user_domain_id": os.environ["PCA_USER_DOMAIN_ID"]})
if "PCA_PROJECT_DOMAIN_NAME" in os.environ:
os_options.update({"project_domain_name": os.environ["PCA_PROJECT_DOMAIN_NAME"]})
if "PCA_PROJECT_DOMAIN_ID" in os.environ:
os_options.update({"project_domain_id": os.environ["PCA_PROJECT_DOMAIN_ID"]})
if "PCA_TENANTNAME" in os.environ:
os_options.update({"tenant_name": os.environ["PCA_TENANTNAME"]})
if "PCA_ENDPOINT_TYPE" in os.environ:
os_options.update({"endpoint_type": os.environ["PCA_ENDPOINT_TYPE"]})
if "PCA_USERID" in os.environ:
os_options.update({"user_id": os.environ["PCA_USERID"]})
if "PCA_TENANTID" in os.environ:
os_options.update({"tenant_id": os.environ["PCA_TENANTID"]})
if "PCA_REGIONNAME" in os.environ:
os_options.update({"region_name": os.environ["PCA_REGIONNAME"]})
else:
conn_kwargs["auth_version"] = "2"
if "PCA_TENANTNAME" in os.environ:
conn_kwargs["tenant_name"] = os.environ["PCA_TENANTNAME"]
if "PCA_REGIONNAME" in os.environ:
os_options.update({"region_name": os.environ["PCA_REGIONNAME"]})
conn_kwargs["os_options"] = os_options
conn_kwargs["retries"] = 0
self.conn_kwargs = conn_kwargs
# This folds the null prefix and all null parts, which means that:
# //MyContainer/ and //MyContainer are equivalent.
# //MyContainer//My/Prefix/ and //MyContainer/My/Prefix are equivalent.
url_parts = [x for x in parsed_url.path.split("/") if x != ""]
self.container = url_parts.pop(0)
if url_parts:
self.prefix = f"{'/'.join(url_parts)}/"
else:
self.prefix = ""
policy = "PCA"
policy_header = "X-Storage-Policy"
container_metadata = None
try:
self.conn = Connection(**self.conn_kwargs)
container_metadata = self.conn.head_container(self.container)
except ClientException:
pass
except Exception as e:
log.FatalError(
f"Connection failed: {e.__class__.__name__} {str(e)}",
log.ErrorCode.connection_failed,
)
if container_metadata is None:
log.Info(f"Creating container {self.container}")
try:
headers = dict([[policy_header, policy]])
self.conn.put_container(self.container, headers=headers)
except Exception as e:
log.FatalError(
f"Container creation failed: {e.__class__.__name__} {str(e)}",
log.ErrorCode.connection_failed,
)
elif policy and container_metadata[policy_header.lower()] != policy:
log.FatalError(
f"Container '{self.container}' exists but its storage policy is "
f"'{container_metadata[policy_header.lower()]}' not '{policy}'."
)
def _error_code(self, operation, e): # pylint: disable= unused-argument
if isinstance(e, self.resp_exc):
if e.http_status == 404:
return log.ErrorCode.backend_not_found
def _put(self, source_path, remote_filename):
self.conn.put_object(
self.container,
self.prefix + os.fsdecode(remote_filename),
open(os.fsdecode(source_path.name), "rb"),
)
def _get(self, remote_filename, local_path):
body = self.unseal(os.fsdecode(remote_filename))
if body:
with open(os.fsdecode(local_path.name), "wb") as f:
for chunk in body:
f.write(chunk)
def __list_objs(self, ffilter=None):
# full_listing should be set to True but a bug in python-swiftclient
# doesn't forward query_string in this case...
# bypass here using a patched copy (with query_string) from swiftclient code
rv = self.conn.get_container(
self.container,
full_listing=False,
path=self.prefix,
query_string="policy_extra=true",
)
listing = rv[1]
while listing:
marker = listing[-1]["name"]
version_marker = listing[-1].get("version_id")
listing = self.conn.get_container(
self.container,
marker=marker,
version_marker=version_marker,
full_listing=False,
path=self.prefix,
query_string="policy_extra=true",
)[1]
if listing:
rv[1].extend(listing)
if ffilter is not None:
return list(filter(ffilter, rv[1]))
return rv[1]
def _list(self):
return [os.fsencode(o["name"][len(self.prefix) :]) for o in self.__list_objs()]
def _delete(self, filename):
self.conn.delete_object(self.container, self.prefix + os.fsdecode(filename))
def _query(self, filename):
sobject = self.conn.head_object(self.container, self.prefix + os.fsdecode(filename))
return {"size": int(sobject["content-length"])}
def unseal(self, remote_filename):
try:
_, body = self.conn.get_object(self.container, remote_filename, resp_chunk_size=1024)
log.Info(f"File {remote_filename} was successfully unsealed.")
return body
except self.resp_exc as e:
# The object is sealed but being released.
if e.http_status == 429:
# The retry-after header contains the remaining duration before
# the unsealing operation completes.
duration = int(e.http_response_headers["Retry-After"])
m, s = divmod(duration, 60)
h, m = divmod(m, 60)
eta = f"{int(h)}h{int(m):02}m{int(s):02}s"
log.Info(f"File {remote_filename} is being unsealed, operation ETA is {eta}.")
else:
log.FatalError(
f"Connection failed: {e.__class__.__name__} {str(e)}",
log.ErrorCode.connection_failed,
)
return None
def pre_process_download_batch(self, remote_filenames):
"""
This is called before downloading volumes from this backend
by main engine. For PCA, volumes passed as argument need to be unsealed.
This method is blocking, showing a status at regular interval
"""
retry_interval = 60 # status will be shown every 60s
# remote_filenames are bytes string
u_remote_filenames = list(map(os.fsdecode, remote_filenames))
objs = self.__list_objs(
ffilter=lambda x: os.fsdecode(x["name"]) in [self.prefix + s for s in u_remote_filenames]
)
# first step: retrieve pca seal status for all required volumes
# and launch unseal for all sealed files
one_object_not_unsealed = False
for o in objs:
filename = os.fsdecode(o["name"])
# see ovh documentation for policy_retrieval_state definition
policy_retrieval_state = o["policy_retrieval_state"]
log.Info(f"Volume {filename}. State : {policy_retrieval_state}. ")
if policy_retrieval_state == "sealed":
log.Notice(f"Launching unseal of volume {filename}.")
self.unseal(o["name"])
one_object_not_unsealed = True
elif policy_retrieval_state == "unsealing":
one_object_not_unsealed = True
# second step: display estimated time for last volume unseal
# and loop until all volumes are unsealed
while one_object_not_unsealed:
one_object_not_unsealed = self.unseal_status(u_remote_filenames)
time.sleep(retry_interval)
# might be a good idea to show a progress bar here...
else:
log.Notice("All volumes to download are unsealed.")
def unseal_status(self, u_remote_filenames):
"""
Shows unsealing status for input volumes
"""
one_object_not_unsealed = False
objs = self.__list_objs(
ffilter=lambda x: os.fsdecode(x["name"]) in [self.prefix + s for s in u_remote_filenames]
)
max_duration = 0
for o in objs:
policy_retrieval_state = o["policy_retrieval_state"]
filename = os.fsdecode(o["name"])
if policy_retrieval_state == "sealed":
log.Notice(f"Error: volume is still in sealed state : {filename}.")
log.Notice(f"Launching unseal of volume {filename}.")
self.unseal(o["name"])
one_object_not_unsealed = True
elif policy_retrieval_state == "unsealing":
duration = int(o["policy_retrieval_delay"])
log.Info(f"{filename} available in {int(duration)} seconds.")
if duration > max_duration:
max_duration = duration
one_object_not_unsealed = True
m, s = divmod(max_duration, 60)
h, m = divmod(m, 60)
max_duration_eta = f"{int(h)}h{int(m):02}m{int(s):02}s"
log.Notice(f"Need to wait {max_duration_eta} before all volumes are unsealed.")
return one_object_not_unsealed
duplicity.backend.register_backend("pca", PCABackend)
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