543 lines
19 KiB
Python
543 lines
19 KiB
Python
#!/usr/bin/env python3
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# -*- coding: utf-8 -*-
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import os
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import binascii
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import datetime
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import uuid
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import string
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import itertools
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import json
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from hashlib import sha256
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from typing import Optional, Union, Tuple, Iterable, Iterator, Mapping
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import radicale
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import radicale.config
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import radicale.types
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from radicale.storage import BaseStorage, BaseCollection
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from radicale.log import logger
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from radicale import item as radicale_item
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import sqlalchemy as sa
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from . import db
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PLUGIN_CONFIG_SCHEMA = {
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'storage': {
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'db_url': {
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'value': '',
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'type': str,
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},
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},
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}
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class Collection(BaseCollection):
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def __init__(self, storage: "Storage", id: uuid.UUID, path: str):
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self._storage = storage
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self._id = id
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self._path = path
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def __repr__(self) -> str:
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return f'Collection(id={self._id}, path={self._path})'
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@property
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def path(self) -> str:
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return self._path
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def _row_to_item(self, row):
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return radicale_item.Item(
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collection=self,
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href=row.name,
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last_modified=row.modified,
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text=row.data.decode(),
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)
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def get_multi(self, hrefs: Iterable[str]) -> Iterable[Tuple[str, Optional["radicale_item.Item"]]]:
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item_table = self._storage._meta.tables['item']
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hrefs_ = list(hrefs)
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#hrefs_ = [(x,) for x in hrefs]
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if not hrefs_:
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return []
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select_stmt = sa.select(
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item_table.c,
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).select_from(
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item_table,
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).where(
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sa.and_(
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item_table.c.collection_id == self._id,
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item_table.c.name.in_(hrefs_)
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),
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)
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l = []
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with self._storage._engine.begin() as connection:
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for row in connection.execute(select_stmt):
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l += [(row.name, self._row_to_item(row))]
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hrefs_set = set(hrefs_)
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hrefs_set_have = set([x[0] for x in l])
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l += [(x, None) for x in (hrefs_set - hrefs_set_have)]
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return l
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def get_all(self) -> Iterator["radicale_item.Item"]:
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item_table = self._storage._meta.tables['item']
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select_stmt = sa.select(
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item_table.c,
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).select_from(
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item_table,
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).where(
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item_table.c.collection_id == self._id,
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)
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with self._storage._engine.begin() as connection:
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for row in connection.execute(select_stmt):
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yield self._row_to_item(row)
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def upload(self, href: str, item: "radicale_item.Item") -> "radicale_item.Item":
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item_table = self._storage._meta.tables['item']
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item_serialized = item.serialize().encode()
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select_stmt = sa.select(
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item_table.c,
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).select_from(
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item_table,
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).where(
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sa.and_(
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item_table.c.collection_id == self._id,
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item_table.c.name == href,
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),
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)
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insert_stmt = sa.insert(
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item_table,
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).values(
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collection_id=self._id,
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name=href,
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data=item_serialized,
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)
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update_stmt = sa.update(
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item_table,
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).values(
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data=item_serialized,
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).where(
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sa.and_(
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item_table.c.collection_id == self._id,
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item_table.c.name == href,
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),
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)
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with self._storage._engine.begin() as connection:
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if connection.execute(select_stmt).one_or_none() is None:
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connection.execute(insert_stmt)
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else:
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connection.execute(update_stmt)
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res = list(self.get_multi([href]))[0][1]
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assert res is not None
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return res
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def delete(self, href: Optional[str] = None) -> None:
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collection_table = self._storage._meta.tables['collection']
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item_table = self._storage._meta.tables['item']
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if href is None:
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delete_stmt = sa.delete(
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collection_table,
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).where(
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collection_table.c.id == self._id,
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)
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else:
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delete_stmt = sa.delete(
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item_table,
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).where(
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sa.and_(
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item_table.c.collection_id == self._id,
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item_table.c.name == href,
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),
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)
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with self._storage._engine.begin() as connection:
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connection.execute(delete_stmt)
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def get_meta(self, key: Optional[str] = None) -> Union[Mapping[str, str], Optional[str]]:
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collection_metadata = self._storage._meta.tables['collection_metadata']
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select_meta = sa.select(
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collection_metadata.c.key,
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collection_metadata.c.value,
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).select_from(
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collection_metadata,
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).where(
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collection_metadata.c.collection_id == self._id,
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)
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if key is not None:
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select_meta = select_meta.where(
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collection_metadata.c.key == key,
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)
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metadata = {}
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with self._storage._engine.begin() as connection:
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for row in connection.execute(select_meta):
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metadata[row.key] = row.value
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if key is not None:
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return metadata.get(key)
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return metadata
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def set_meta(self, props: Mapping[str, str]) -> None:
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collection_metadata = self._storage._meta.tables['collection_metadata']
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delete_stmt = sa.delete(
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collection_metadata,
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).where(
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collection_metadata.c.collection_id == self._id,
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)
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insert_stmt = sa.insert(
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collection_metadata,
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).values([dict(collection_id=self._id, key=k, value=v) for k, v in props.items()])
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with self._storage._engine.begin() as connection:
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connection.execute(delete_stmt)
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connection.execute(insert_stmt)
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@property
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def last_modified(self) -> str:
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collection = self._storage._meta.tables['collection']
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select_stmt = sa.select(
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collection.c.modified,
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).select_from(
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collection,
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).where(
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collection.c.id == self._id,
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)
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with self._storage._engine.begin() as connection:
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c = connection.execute(select_stmt).one()
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return c.modified.strftime('%a, %d %b %Y %H:%M:%S GMT')
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def _update_history_etag(self, href: str, item: Optional["radicale_item.Item"]) -> str:
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item_history_table = self._storage._meta.tables['item_history']
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select_etag_stmt = sa.select(
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item_history_table.c,
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).select_from(
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item_history_table,
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).where(
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sa.and_(
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item_history_table.c.collection_id == self._id,
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item_history_table.c.name == href,
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),
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)
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exists: bool
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with self._storage._engine.begin() as connection:
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item_history = connection.execute(select_etag_stmt).one_or_none()
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if item_history is not None:
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exists = True
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cache_etag = item_history.etag,
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history_etag = item_history.history_etag
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else:
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exists = False
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cache_etag = ''
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history_etag = binascii.hexlify(os.urandom(16)).decode('ascii')
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etag = item.etag if item else ''
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if etag != cache_etag:
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if exists:
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upsert = sa.update(
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item_history_table,
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).values(
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etag=etag,
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history_etag=history_etag,
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).where(
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sa.and_(
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item_history_table.c.collection_id == self._id,
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item_history_table.c.name == href,
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),
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)
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else:
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upsert = sa.insert(
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item_history_table,
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).values(
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collection_id=self._id,
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name=href,
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etag=etag,
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history_etag=history_etag,
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)
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connection.execute(upsert)
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return history_etag
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def _get_deleted_history_refs(self):
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item_table = self._storage._meta.tables['item']
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item_history_table = self._storage._meta.tables['item_history']
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select_stmt = sa.select(
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item_history_table.c.name,
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).select_from(
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item_history_table.join(
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item_table,
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sa.and_(
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item_history_table.c.collection_id == item_table.c.collection_id,
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item_history_table.c.name == item_table.c.name,
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),
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isouter=True,
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),
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).where(
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item_table.c.id == None,
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)
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with self._storage._engine.begin() as connection:
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for row in connection.execute(select_stmt):
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yield row.href
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def _delete_history_refs(self):
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item_history_table = self._storage._meta.tables['item_history']
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delete_stmt = sa.delete(
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item_history_table,
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).where(
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sa.and_(
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item_history_table.c.href.in_(list(self._get_deleted_history_refs())),
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item_history_table.c.collection_id == self._id,
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item_history_table.c.modified < (datetime.datetime.now() - datetime.timedelta(seconds=self._storage.configuration.get('storage', 'max_sync_token_age')))
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),
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)
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with self._storage._engine.begin() as connection:
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connection.execute(delete_stmt)
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def sync(self, old_token: str = '') -> Tuple[str, Iterable[str]]:
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_prefix = 'http://radicale.org/ns/sync/'
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collection_state_table = self._storage._meta.tables['collection_state']
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def check_token_name(token_name: str) -> bool:
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print(token_name)
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print(len(token_name))
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if len(token_name) != 64:
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return False
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for c in token_name:
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if c not in string.hexdigits.lower():
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return False
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return True
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old_token_name = ''
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if old_token:
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if not old_token.startswith(_prefix):
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raise ValueError(f'Malformed token: {old_token}')
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old_token_name = old_token[len(_prefix):]
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if not check_token_name(old_token_name):
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raise ValueError(f'Malformed token: {old_token}')
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state = {}
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token_name_hash = sha256()
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# compute new state
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for href, item in itertools.chain(
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((item.href, item) for item in self.get_all()),
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((href, None) for href in self._get_deleted_history_refs())
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):
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assert isinstance(href, str)
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history_etag = self._update_history_etag(href, item)
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state[href] = history_etag
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token_name_hash.update((href + '/' + history_etag).encode())
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token_name = token_name_hash.hexdigest()
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token = _prefix + token_name
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# if new state hasn't changed: dont send any updates
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if token_name == old_token_name:
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return token, ()
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# load old state
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old_state = {}
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with self._storage._engine.begin() as connection:
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if old_token_name:
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select_stmt = sa.select(
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collection_state_table.c,
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).select_from(
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collection_state_table,
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).where(
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sa.and_(
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collection_state_table.c.collection_id == self._id,
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collection_state_table.c.name == old_token_name,
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),
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)
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state_row = connection.execute(select_stmt).one()
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state = json.loads(state_row.state.decode())
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# store new state
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## should never be a duplicate
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insert_stmt = sa.insert(
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collection_state_table,
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).values(
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collection_id=self._id,
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name=token_name,
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state=json.dumps(state).encode(),
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)
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connection.execute(insert_stmt)
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changes = []
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for href, history_etag in state.items():
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if history_etag != old_state.get(href):
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changes += [href]
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for href, history_etag in old_state.items():
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if href not in state:
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changes += [href]
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return token, changes
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class Storage(BaseStorage):
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def __init__(self, configuration: "radicale.config.Configuration"):
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super().__init__(configuration)
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self._meta = db.create_meta()
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self._engine, self._root_collection = db.create(self.configuration.get('storage', 'url'), self._meta)
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def _split_path(self, path: str):
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path_parts = path.split('/')
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if path_parts[0] == '':
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path_parts = path_parts[1:]
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if path_parts[-1] == '':
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path_parts = path_parts[:-1]
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return path_parts
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def discover(self, path: str, depth: str = "0") -> Iterable["radicale.types.CollectionOrItem"]:
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logger.info("path = %s, depth = %s", path, depth)
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if path == '/':
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return [Collection(self, self._root_collection.id, '')]
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path_parts = self._split_path(path)
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collection_table = self._meta.tables['collection']
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item_table = self._meta.tables['item']
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select_collection_or_item = sa.select(
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collection_table.c.id,
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collection_table.c.parent_id.label('parent_id'),
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collection_table.c.modified,
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collection_table.c.name,
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sa.literal(None, sa.LargeBinary()).label('data'),
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sa.literal('collection', sa.String(16)).label('type_'),
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).select_from(
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collection_table
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).union_all(sa.select(
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item_table.c.id,
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item_table.c.collection_id.label('parent_id'),
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item_table.c.modified,
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item_table.c.name,
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item_table.c.data,
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sa.literal('item', sa.String(16)).label('type_'),
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).select_from(
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item_table
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))
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i = 0
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select_from = select_collection_or_item.alias('data')
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aliases = [select_from]
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for path in path_parts[::-1]:
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aliases += [select_collection_or_item.alias(f't{i}')]
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i += 1
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select_from = select_from.join(
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aliases[-1],
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sa.and_(
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aliases[-2].c.parent_id == aliases[-1].c.id,
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aliases[-2].c.name == path,
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),
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)
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select_stmt = sa.select(
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aliases[0].c,
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).select_from(
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select_from
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).where(
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aliases[-1].c.parent_id == None,
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)
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select_sub_stmt = None
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if depth != "0":
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aliased = select_collection_or_item.alias('data_list')
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select_sub_stmt = sa.select(
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aliased.c,
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).select_from(
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aliased.join(
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select_from,
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aliased.c.parent_id == aliases[0].c.id,
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),
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).where(
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aliases[-1].c.parent_id == None,
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)
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l = []
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with self._engine.begin() as connection:
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self_collection = connection.execute(select_stmt).one_or_none()
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if self_collection is None:
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return []
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self_collection = Collection(self, self_collection.id, '/'.join(path_parts))
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l += [self_collection]
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if select_sub_stmt is not None:
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for row in connection.execute(select_sub_stmt):
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path = '/'.join(path_parts)
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path += '/'
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path += row.name
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if row.type_ == 'collection':
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l += [Collection(self, row.id, path)]
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elif row.type_ == 'item':
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assert self_collection is not None
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l += [self_collection._row_to_item(row)]
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return l
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def move(self, item: "radicale_item.Item", to_collection: "BaseCollection", to_href: str) -> None:
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pass
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def create_collection(
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self,
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href: str,
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items: Optional[Iterable["radicale_item.Item"]]=None,
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props: Optional[Mapping[str, str]]=None,
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) -> "BaseCollection":
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print('creating collection')
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print(f'href={href}, items={items}, props={props}')
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path = self._split_path(href)
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parent_id = self._root_collection.id
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collection_table = self._meta.tables['collection']
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collection_metadata_table = self._meta.tables['collection_metadata']
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item_table = self._meta.tables['item']
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with self._engine.begin() as connection:
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for p in path:
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select_stmt = sa.select(
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collection_table.c,
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).select_from(
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collection_table,
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).where(
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sa.and_(
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collection_table.c.parent_id == parent_id,
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collection_table.c.name == p,
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),
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)
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c = connection.execute(select_stmt).one_or_none()
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if c is None:
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insert_stmt = sa.insert(
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collection_table,
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).values(
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parent_id=parent_id,
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name=p,
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).returning(
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collection_table.c,
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)
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c = connection.execute(insert_stmt).one()
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parent_id = c.id
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if items is not None or props is not None:
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# drop all subcollections and items
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delete_collections_stmt = sa.delete(
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collection_table,
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).where(
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collection_table.c.parent_id == parent_id,
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)
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delete_meta_stmt = sa.delete(
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collection_metadata_table,
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).where(
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collection_metadata_table.c.collection_id == parent_id,
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)
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delete_items_stmt = sa.delete(
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item_table,
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).where(
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item_table.c.collection_id == parent_id,
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)
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connection.execute(delete_collections_stmt)
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connection.execute(delete_meta_stmt)
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|
connection.execute(delete_items_stmt)
|
|
if props is not None:
|
|
insert_stmt = sa.insert(
|
|
collection_metadata_table,
|
|
).values([dict(collection_id=parent_id, key=k, value=v) for k, v in props.items()])
|
|
connection.execute(insert_stmt)
|
|
if props is not None and 'key' in props and items is not None:
|
|
print(items)
|
|
# TODO insert items
|
|
c = Collection(self, parent_id, '/'.join(path))
|
|
print(c)
|
|
return c
|
|
|
|
|
|
|
|
@radicale.types.contextmanager
|
|
def acquire_lock(self, mode: str, user: str = "") -> Iterator[None]:
|
|
# locking happens on a db level
|
|
yield
|
|
|
|
def verify(self) -> bool:
|
|
return True
|