Page MenuHomeSoftware Heritage
Files F7450745

director.py
No OneTemporary
Actions

director.py
View Options

# Copyright (C) 2015-2016 The Software Heritage developers
# See the AUTHORS file at the top-level directory of this distribution
# License: GNU General Public License version 3, or any later version
# See top-level LICENSE file for more information
import abc
import click
import sys
from swh.core import config, utils, hashutil
from swh.scheduler.celery_backend.config import app
from . import tasks # noqa
from .storage import ArchiverStorage
class ArchiverDirectorBase(config.SWHConfig, metaclass=abc.ABCMeta):
"""Abstract Director class
An archiver director is in charge of dispatching batch of
contents to archiver workers (for them to archive).
Inherit from this class and provide:
- ADDITIONAL_CONFIG: Some added configuration needed for the
director to work
- CONFIG_BASE_FILENAME: relative path to lookup for the
configuration file
- def get_contents_to_archive(self): Implementation method to read
contents to archive
"""
DEFAULT_CONFIG = {
'batch_max_size': ('int', 1500),
'asynchronous': ('bool', True),
'dbconn': ('str', 'dbname=softwareheritage-archiver-dev user=guest')
}
# Destined to be overridden by subclass
ADDITIONAL_CONFIG = {}
# We use the same configuration file as the worker
CONFIG_BASE_FILENAME = 'archiver/worker'
# The worker's task queue name to use
TASK_NAME = None
def __init__(self):
""" Constructor of the archiver director.
Args:
db_conn_archiver: Either a libpq connection string,
or a psycopg2 connection for the archiver db.
config: optionnal additional configuration. Keys in the dict will
override the one parsed from the configuration file.
"""
super().__init__()
self.config = self.parse_config_file(
additional_configs=[self.ADDITIONAL_CONFIG])
self.archiver_storage = ArchiverStorage(self.config['dbconn'])
def run(self):
""" Run the archiver director.
The archiver director will check all the contents of the archiver
database and do the required backup jobs.
"""
if self.config['asynchronous']:
run_fn = self.run_async_worker
else:
run_fn = self.run_sync_worker
for batch in self.read_batch_contents():
run_fn(batch)
def run_async_worker(self, batch):
""" Produce a worker that will be added to the task queue.
"""
task = app.tasks[self.TASK_NAME]
task.delay(batch=batch)
def run_sync_worker(self, batch):
""" Run synchronously a worker on the given batch.
"""
task = app.tasks[self.TASK_NAME]
task(batch=batch)
def read_batch_contents(self):
""" Create batch of contents that needs to be archived
Yields:
batch of sha1 that corresponds to contents that needs more archive
copies.
"""
contents = []
for content in self.get_contents_to_archive():
contents.append(content)
if len(contents) > self.config['batch_max_size']:
yield contents
contents = []
if len(contents) > 0:
yield contents
@abc.abstractmethod
def get_contents_to_archive(self):
"""Retrieve generator of sha1 to archive
Yields:
sha1 to archive
"""
pass
class ArchiverWithRetentionPolicyDirector(ArchiverDirectorBase):
"""Process the files in order to know which one is needed as backup.
The archiver director processes the files in the local storage in order
to know which one needs archival and it delegates this task to
archiver workers.
"""
ADDITIONAL_CONFIG = {
'retention_policy': ('int', 2),
}
TASK_NAME = 'swh.storage.archiver.tasks.SWHArchiverWithRetentionPolicyTask'
def get_contents_to_archive(self):
"""Create batch of contents that needs to be archived
Yields:
Datas about a content as a tuple
(content_id, present_copies, ongoing_copies) where ongoing_copies
is a dict mapping copy to mtime.
"""
last_content = None
while True:
archiver_contents = list(
self.archiver_storage.content_archive_get_unarchived_copies(
last_content=last_content,
retention_policy=self.config['retention_policy']))
if not archiver_contents:
return
for content_id, _, _ in archiver_contents:
last_content = content_id
yield content_id
def read_sha1_from_stdin():
"""Read sha1 from stdin.
"""
for sha1 in sys.stdin:
yield {'content_id': hashutil.hex_to_hash(sha1.rstrip())}
class ArchiverStdinToBackendDirector(ArchiverDirectorBase):
"""A cloud archiver director in charge of reading contents and send
them in batch in the cloud.
The archiver director processes the files in the local storage in
order to know which one needs archival and it delegates this task
to archiver workers.
"""
ADDITIONAL_CONFIG = {
'destination_host': ('str', 'azure'),
'force_copy': ('bool', False),
}
CONFIG_BASE_FILENAME = 'archiver/worker-to-backend'
TASK_NAME = 'swh.storage.archiver.tasks.SWHArchiverToBackendTask'
def __init__(self):
super().__init__()
self.destination_host = self.config['destination_host']
self.force_copy = self.config['force_copy']
def get_contents_to_archive(self):
gen_content_ids = (
ids for ids in utils.grouper(read_sha1_from_stdin(),
self.config['batch_max_size'])
)
if self.force_copy:
for content_ids in gen_content_ids:
content_ids = list(content_ids)
if not content_ids:
continue
print('Send %s contents to archive' % len(content_ids))
for content in content_ids:
yield content['content_id']
else:
for content_ids in gen_content_ids:
content_ids = list(
self.archiver_storage.content_archive_get_missing(
content_ids=content_ids,
backend_name=self.destination_host))
if not content_ids:
continue
print('Send %s contents to archive' % len(content_ids))
for content in content_ids:
yield content
@click.command()
@click.option('--direct', is_flag=True,
help="""The archiver sends content for backup to
one storage.""")
def launch(direct):
if direct:
archiver = ArchiverStdinToBackendDirector()
else:
archiver = ArchiverWithRetentionPolicyDirector()
archiver.run()
if __name__ == '__main__':
launch()

File Metadata

Mime Type
text/x-python
Expires
Thu, Apr 17, 8:34 AM (4 d, 20 h ago)
Storage Engine
blob
Storage Format
Raw Data
Storage Handle
3275556

Event Timeline

About · Developer information · Legal