swh.objstorage.backends.winery.roshard module#

exception swh.objstorage.backends.winery.roshard.ShardNotMapped[source]#

Bases: Exception

class swh.objstorage.backends.winery.roshard.Pool(shard_max_size: int, rbd_use_sudo: bool = True, rbd_pool_name: str = 'shards', rbd_data_pool_name: str | None = None, rbd_image_features_unsupported: Tuple[str, ...] = (), rbd_map_options: str = '')[source]#

Bases: object

Manage a Ceph RBD pool for Winery shards.

Parameters:

  • shard_max_size – max size of shard contents

  • rbd_use_sudo – whether to use sudo for rbd commands

  • rbd_pool_name – name of the pool used for RBD images (metadata)

  • rbd_data_pool_name – name of the pool used for RBD images (data)

  • rbd_image_features_unsupported – features not supported by the kernel mounting the rbd images

  • rbd_map_options – options to pass to rbd device map, e.g. ms_mode=prefer-secure to connect to a ceph cluster with encryption enabled

POOL_CONFIG: Tuple[str, ...] = ('shard_max_size', 'rbd_use_sudo', 'rbd_pool_name', 'rbd_data_pool_name', 'rbd_image_features_unsupported', 'rbd_map_options')#
classmethod from_kwargs(**kwargs) → Pool[source]#

Create a Pool from a set of arbitrary keyword arguments

run(*cmd: str) → Iterable[str][source]#

Run the given command, and return its output as lines.

Return: the standard output of the run command

Raises: CalledProcessError if the command doesn’t exit with exit code 0.

rbd(*arguments: str) → Iterable[str][source]#

Run rbd with the given arguments

image_exists(image: str)[source]#
image_mapped(image: str) → Literal['ro', 'rw'] | None[source]#

Check whether the image is already mapped, read-only or read-write

image_list()[source]#
image_path(image: str) → str[source]#
image_create(image: str)[source]#
image_map(image: str, options: str)[source]#
image_remap_ro(image: str)[source]#
image_unmap(image: str)[source]#
manage_images(base_dsn: str, manage_rw_images: bool, wait_for_image: Callable[[int], None], stop_running: Callable[[], bool], application_name: str | None = None) → None[source]#

Manage RBD image creation and mapping automatically.

Parameters:

  • base_dsn – the DSN of the connection to the SharedBase

  • manage_rw_images – whether RW images should be created and mapped

  • wait_for_image – function which is called at each loop iteration, with an attempt number, if no images had to be mapped recently

  • stop_running – callback that returns True when the manager should stop running

  • application_name – the application name sent to PostgreSQL

class swh.objstorage.backends.winery.roshard.ROShard(name, **kwargs)[source]#

Bases: object

open()[source]#
get(key)[source]#
close()[source]#
static delete(pool, shard_name, obj_id)[source]#
class swh.objstorage.backends.winery.roshard.ROShardCreator(name: str, count: int, rbd_create_images: bool = True, rbd_wait_for_image: ~typing.Callable[[int], None] = <function sleep_exponential.<locals>.sleep>, **kwargs)[source]#

Bases: object

Helper for Read-Only shard creation.

Parameters:

  • name – Name of the shard to be initialized

  • count – Number of objects to provision in the shard

  • rbd_create_images – whether the ROShardCreator should create the rbd image, or delegate to the rbd_shard_manager

  • rbd_wait_for_image – function called when waiting for a shard to be mapped

  • shard_max_size – the size of the shard, passed to Pool

  • rbd_* – other RBD-related Pool arguments

  • throttle_* – Throttler arguments

zero_image_if_needed()[source]#

Check whether the image is empty, and zero it out if it’s not.

We really check only the first 1kB, as we assume that the SWHShard marker will have been written at the beginning of the image under all circumstances if the RO Shard creation has been interrupted.

add(content, obj_id)[source]#