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|
# Copyright 2011 Canonical Ltd.
# Copyright 2016 LEAP Encryption Access Project
#
# This file is part of u1db.
#
# u1db is free software: you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License version 3
# as published by the Free Software Foundation.
#
# u1db 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 Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with u1db. If not, see <http://www.gnu.org/licenses/>.
"""
A L2DB implementation that uses SQLite as its persistence layer.
"""
import errno
import os
import json
import sys
import time
import uuid
import pkg_resources
from sqlite3 import dbapi2
from leap.soledad.common.l2db.backends import CommonBackend, CommonSyncTarget
from leap.soledad.common.l2db import (
Document, errors,
query_parser, vectorclock)
class SQLiteDatabase(CommonBackend):
"""A U1DB implementation that uses SQLite as its persistence layer."""
_sqlite_registry = {}
def __init__(self, sqlite_file, document_factory=None):
"""Create a new sqlite file."""
self._db_handle = dbapi2.connect(sqlite_file)
self._real_replica_uid = None
self._ensure_schema()
self._factory = document_factory or Document
def set_document_factory(self, factory):
self._factory = factory
def get_sync_target(self):
return SQLiteSyncTarget(self)
@classmethod
def _which_index_storage(cls, c):
try:
c.execute("SELECT value FROM u1db_config"
" WHERE name = 'index_storage'")
except dbapi2.OperationalError, e:
# The table does not exist yet
return None, e
else:
return c.fetchone()[0], None
WAIT_FOR_PARALLEL_INIT_HALF_INTERVAL = 0.5
@classmethod
def _open_database(cls, sqlite_file, document_factory=None):
if not os.path.isfile(sqlite_file):
raise errors.DatabaseDoesNotExist()
tries = 2
while True:
# Note: There seems to be a bug in sqlite 3.5.9 (with python2.6)
# where without re-opening the database on Windows, it
# doesn't see the transaction that was just committed
db_handle = dbapi2.connect(sqlite_file)
c = db_handle.cursor()
v, err = cls._which_index_storage(c)
db_handle.close()
if v is not None:
break
# possibly another process is initializing it, wait for it to be
# done
if tries == 0:
raise err # go for the richest error?
tries -= 1
time.sleep(cls.WAIT_FOR_PARALLEL_INIT_HALF_INTERVAL)
return SQLiteDatabase._sqlite_registry[v](
sqlite_file, document_factory=document_factory)
@classmethod
def open_database(cls, sqlite_file, create, backend_cls=None,
document_factory=None):
try:
return cls._open_database(
sqlite_file, document_factory=document_factory)
except errors.DatabaseDoesNotExist:
if not create:
raise
if backend_cls is None:
# default is SQLitePartialExpandDatabase
backend_cls = SQLitePartialExpandDatabase
return backend_cls(sqlite_file, document_factory=document_factory)
@staticmethod
def delete_database(sqlite_file):
try:
os.unlink(sqlite_file)
except OSError as ex:
if ex.errno == errno.ENOENT:
raise errors.DatabaseDoesNotExist()
raise
@staticmethod
def register_implementation(klass):
"""Register that we implement an SQLiteDatabase.
The attribute _index_storage_value will be used as the lookup key.
"""
SQLiteDatabase._sqlite_registry[klass._index_storage_value] = klass
def _get_sqlite_handle(self):
"""Get access to the underlying sqlite database.
This should only be used by the test suite, etc, for examining the
state of the underlying database.
"""
return self._db_handle
def _close_sqlite_handle(self):
"""Release access to the underlying sqlite database."""
self._db_handle.close()
def close(self):
self._close_sqlite_handle()
def _is_initialized(self, c):
"""Check if this database has been initialized."""
c.execute("PRAGMA case_sensitive_like=ON")
try:
c.execute("SELECT value FROM u1db_config"
" WHERE name = 'sql_schema'")
except dbapi2.OperationalError:
# The table does not exist yet
val = None
else:
val = c.fetchone()
if val is not None:
return True
return False
def _initialize(self, c):
"""Create the schema in the database."""
# read the script with sql commands
# TODO: Change how we set up the dependency. Most likely use something
# like lp:dirspec to grab the file from a common resource
# directory. Doesn't specifically need to be handled until we get
# to the point of packaging this.
schema_content = pkg_resources.resource_string(
__name__, 'dbschema.sql')
# Note: We'd like to use c.executescript() here, but it seems that
# executescript always commits, even if you set
# isolation_level = None, so if we want to properly handle
# exclusive locking and rollbacks between processes, we need
# to execute it line-by-line
for line in schema_content.split(';'):
if not line:
continue
c.execute(line)
# add extra fields
self._extra_schema_init(c)
# A unique identifier should be set for this replica. Implementations
# don't have to strictly use uuid here, but we do want the uid to be
# unique amongst all databases that will sync with each other.
# We might extend this to using something with hostname for easier
# debugging.
self._set_replica_uid_in_transaction(uuid.uuid4().hex)
c.execute("INSERT INTO u1db_config VALUES" " ('index_storage', ?)",
(self._index_storage_value,))
def _ensure_schema(self):
"""Ensure that the database schema has been created."""
old_isolation_level = self._db_handle.isolation_level
c = self._db_handle.cursor()
if self._is_initialized(c):
return
try:
# autocommit/own mgmt of transactions
self._db_handle.isolation_level = None
with self._db_handle:
# only one execution path should initialize the db
c.execute("begin exclusive")
if self._is_initialized(c):
return
self._initialize(c)
finally:
self._db_handle.isolation_level = old_isolation_level
def _extra_schema_init(self, c):
"""Add any extra fields, etc to the basic table definitions."""
def _parse_index_definition(self, index_field):
"""Parse a field definition for an index, returning a Getter."""
# Note: We may want to keep a Parser object around, and cache the
# Getter objects for a greater length of time. Specifically, if
# you create a bunch of indexes, and then insert 50k docs, you'll
# re-parse the indexes between puts. The time to insert the docs
# is still likely to dominate put_doc time, though.
parser = query_parser.Parser()
getter = parser.parse(index_field)
return getter
def _update_indexes(self, doc_id, raw_doc, getters, db_cursor):
"""Update document_fields for a single document.
:param doc_id: Identifier for this document
:param raw_doc: The python dict representation of the document.
:param getters: A list of [(field_name, Getter)]. Getter.get will be
called to evaluate the index definition for this document, and the
results will be inserted into the db.
:param db_cursor: An sqlite Cursor.
:return: None
"""
values = []
for field_name, getter in getters:
for idx_value in getter.get(raw_doc):
values.append((doc_id, field_name, idx_value))
if values:
db_cursor.executemany(
"INSERT INTO document_fields VALUES (?, ?, ?)", values)
def _set_replica_uid(self, replica_uid):
"""Force the replica_uid to be set."""
with self._db_handle:
self._set_replica_uid_in_transaction(replica_uid)
def _set_replica_uid_in_transaction(self, replica_uid):
"""Set the replica_uid. A transaction should already be held."""
c = self._db_handle.cursor()
c.execute("INSERT OR REPLACE INTO u1db_config"
" VALUES ('replica_uid', ?)",
(replica_uid,))
self._real_replica_uid = replica_uid
def _get_replica_uid(self):
if self._real_replica_uid is not None:
return self._real_replica_uid
c = self._db_handle.cursor()
c.execute("SELECT value FROM u1db_config WHERE name = 'replica_uid'")
val = c.fetchone()
if val is None:
return None
self._real_replica_uid = val[0]
return self._real_replica_uid
_replica_uid = property(_get_replica_uid)
def _get_generation(self):
c = self._db_handle.cursor()
c.execute('SELECT max(generation) FROM transaction_log')
val = c.fetchone()[0]
if val is None:
return 0
return val
def _get_generation_info(self):
c = self._db_handle.cursor()
c.execute(
'SELECT max(generation), transaction_id FROM transaction_log ')
val = c.fetchone()
if val[0] is None:
return(0, '')
return val
def _get_trans_id_for_gen(self, generation):
if generation == 0:
return ''
c = self._db_handle.cursor()
c.execute(
'SELECT transaction_id FROM transaction_log WHERE generation = ?',
(generation,))
val = c.fetchone()
if val is None:
raise errors.InvalidGeneration
return val[0]
def _get_transaction_log(self):
c = self._db_handle.cursor()
c.execute("SELECT doc_id, transaction_id FROM transaction_log"
" ORDER BY generation")
return c.fetchall()
def _get_doc(self, doc_id, check_for_conflicts=False):
"""Get just the document content, without fancy handling."""
c = self._db_handle.cursor()
if check_for_conflicts:
c.execute(
"SELECT document.doc_rev, document.content, "
"count(conflicts.doc_rev) FROM document LEFT OUTER JOIN "
"conflicts ON conflicts.doc_id = document.doc_id WHERE "
"document.doc_id = ? GROUP BY document.doc_id, "
"document.doc_rev, document.content;", (doc_id,))
else:
c.execute(
"SELECT doc_rev, content, 0 FROM document WHERE doc_id = ?",
(doc_id,))
val = c.fetchone()
if val is None:
return None
doc_rev, content, conflicts = val
doc = self._factory(doc_id, doc_rev, content)
doc.has_conflicts = conflicts > 0
return doc
def _has_conflicts(self, doc_id):
c = self._db_handle.cursor()
c.execute("SELECT 1 FROM conflicts WHERE doc_id = ? LIMIT 1",
(doc_id,))
val = c.fetchone()
if val is None:
return False
else:
return True
def get_doc(self, doc_id, include_deleted=False):
doc = self._get_doc(doc_id, check_for_conflicts=True)
if doc is None:
return None
if doc.is_tombstone() and not include_deleted:
return None
return doc
def get_all_docs(self, include_deleted=False):
"""Get all documents from the database."""
generation = self._get_generation()
results = []
c = self._db_handle.cursor()
c.execute(
"SELECT document.doc_id, document.doc_rev, document.content, "
"count(conflicts.doc_rev) FROM document LEFT OUTER JOIN conflicts "
"ON conflicts.doc_id = document.doc_id GROUP BY document.doc_id, "
"document.doc_rev, document.content;")
rows = c.fetchall()
for doc_id, doc_rev, content, conflicts in rows:
if content is None and not include_deleted:
continue
doc = self._factory(doc_id, doc_rev, content)
doc.has_conflicts = conflicts > 0
results.append(doc)
return (generation, results)
def put_doc(self, doc):
if doc.doc_id is None:
raise errors.InvalidDocId()
self._check_doc_id(doc.doc_id)
self._check_doc_size(doc)
with self._db_handle:
old_doc = self._get_doc(doc.doc_id, check_for_conflicts=True)
if old_doc and old_doc.has_conflicts:
raise errors.ConflictedDoc()
if old_doc and doc.rev is None and old_doc.is_tombstone():
new_rev = self._allocate_doc_rev(old_doc.rev)
else:
if old_doc is not None:
if old_doc.rev != doc.rev:
raise errors.RevisionConflict()
else:
if doc.rev is not None:
raise errors.RevisionConflict()
new_rev = self._allocate_doc_rev(doc.rev)
doc.rev = new_rev
self._put_and_update_indexes(old_doc, doc)
return new_rev
def _expand_to_fields(self, doc_id, base_field, raw_doc, save_none):
"""Convert a dict representation into named fields.
So something like: {'key1': 'val1', 'key2': 'val2'}
gets converted into: [(doc_id, 'key1', 'val1', 0)
(doc_id, 'key2', 'val2', 0)]
:param doc_id: Just added to every record.
:param base_field: if set, these are nested keys, so each field should
be appropriately prefixed.
:param raw_doc: The python dictionary.
"""
# TODO: Handle lists
values = []
for field_name, value in raw_doc.iteritems():
if value is None and not save_none:
continue
if base_field:
full_name = base_field + '.' + field_name
else:
full_name = field_name
if value is None or isinstance(value, (int, float, basestring)):
values.append((doc_id, full_name, value, len(values)))
else:
subvalues = self._expand_to_fields(doc_id, full_name, value,
save_none)
for _, subfield_name, val, _ in subvalues:
values.append((doc_id, subfield_name, val, len(values)))
return values
def _put_and_update_indexes(self, old_doc, doc):
"""Actually insert a document into the database.
This both updates the existing documents content, and any indexes that
refer to this document.
"""
raise NotImplementedError(self._put_and_update_indexes)
def whats_changed(self, old_generation=0):
c = self._db_handle.cursor()
c.execute("SELECT generation, doc_id, transaction_id"
" FROM transaction_log"
" WHERE generation > ? ORDER BY generation DESC",
(old_generation,))
results = c.fetchall()
cur_gen = old_generation
seen = set()
changes = []
newest_trans_id = ''
for generation, doc_id, trans_id in results:
if doc_id not in seen:
changes.append((doc_id, generation, trans_id))
seen.add(doc_id)
if changes:
cur_gen = changes[0][1] # max generation
newest_trans_id = changes[0][2]
changes.reverse()
else:
c.execute("SELECT generation, transaction_id"
" FROM transaction_log ORDER BY generation DESC LIMIT 1")
results = c.fetchone()
if not results:
cur_gen = 0
newest_trans_id = ''
else:
cur_gen, newest_trans_id = results
return cur_gen, newest_trans_id, changes
def delete_doc(self, doc):
with self._db_handle:
old_doc = self._get_doc(doc.doc_id, check_for_conflicts=True)
if old_doc is None:
raise errors.DocumentDoesNotExist
if old_doc.rev != doc.rev:
raise errors.RevisionConflict()
if old_doc.is_tombstone():
raise errors.DocumentAlreadyDeleted
if old_doc.has_conflicts:
raise errors.ConflictedDoc()
new_rev = self._allocate_doc_rev(doc.rev)
doc.rev = new_rev
doc.make_tombstone()
self._put_and_update_indexes(old_doc, doc)
return new_rev
def _get_conflicts(self, doc_id):
c = self._db_handle.cursor()
c.execute("SELECT doc_rev, content FROM conflicts WHERE doc_id = ?",
(doc_id,))
return [self._factory(doc_id, doc_rev, content)
for doc_rev, content in c.fetchall()]
def get_doc_conflicts(self, doc_id):
with self._db_handle:
conflict_docs = self._get_conflicts(doc_id)
if not conflict_docs:
return []
this_doc = self._get_doc(doc_id)
this_doc.has_conflicts = True
return [this_doc] + conflict_docs
def _get_replica_gen_and_trans_id(self, other_replica_uid):
c = self._db_handle.cursor()
c.execute("SELECT known_generation, known_transaction_id FROM sync_log"
" WHERE replica_uid = ?",
(other_replica_uid,))
val = c.fetchone()
if val is None:
other_gen = 0
trans_id = ''
else:
other_gen = val[0]
trans_id = val[1]
return other_gen, trans_id
def _set_replica_gen_and_trans_id(self, other_replica_uid,
other_generation, other_transaction_id):
with self._db_handle:
self._do_set_replica_gen_and_trans_id(
other_replica_uid, other_generation, other_transaction_id)
def _do_set_replica_gen_and_trans_id(self, other_replica_uid,
other_generation,
other_transaction_id):
c = self._db_handle.cursor()
c.execute("INSERT OR REPLACE INTO sync_log VALUES (?, ?, ?)",
(other_replica_uid, other_generation,
other_transaction_id))
def _put_doc_if_newer(self, doc, save_conflict, replica_uid=None,
replica_gen=None, replica_trans_id=None):
with self._db_handle:
return super(SQLiteDatabase, self)._put_doc_if_newer(
doc,
save_conflict=save_conflict,
replica_uid=replica_uid, replica_gen=replica_gen,
replica_trans_id=replica_trans_id)
def _add_conflict(self, c, doc_id, my_doc_rev, my_content):
c.execute("INSERT INTO conflicts VALUES (?, ?, ?)",
(doc_id, my_doc_rev, my_content))
def _delete_conflicts(self, c, doc, conflict_revs):
deleting = [(doc.doc_id, c_rev) for c_rev in conflict_revs]
c.executemany("DELETE FROM conflicts"
" WHERE doc_id=? AND doc_rev=?", deleting)
doc.has_conflicts = self._has_conflicts(doc.doc_id)
def _prune_conflicts(self, doc, doc_vcr):
if self._has_conflicts(doc.doc_id):
autoresolved = False
c_revs_to_prune = []
for c_doc in self._get_conflicts(doc.doc_id):
c_vcr = vectorclock.VectorClockRev(c_doc.rev)
if doc_vcr.is_newer(c_vcr):
c_revs_to_prune.append(c_doc.rev)
elif doc.same_content_as(c_doc):
c_revs_to_prune.append(c_doc.rev)
doc_vcr.maximize(c_vcr)
autoresolved = True
if autoresolved:
doc_vcr.increment(self._replica_uid)
doc.rev = doc_vcr.as_str()
c = self._db_handle.cursor()
self._delete_conflicts(c, doc, c_revs_to_prune)
def _force_doc_sync_conflict(self, doc):
my_doc = self._get_doc(doc.doc_id)
c = self._db_handle.cursor()
self._prune_conflicts(doc, vectorclock.VectorClockRev(doc.rev))
self._add_conflict(c, doc.doc_id, my_doc.rev, my_doc.get_json())
doc.has_conflicts = True
self._put_and_update_indexes(my_doc, doc)
def resolve_doc(self, doc, conflicted_doc_revs):
with self._db_handle:
cur_doc = self._get_doc(doc.doc_id)
# TODO: https://bugs.launchpad.net/u1db/+bug/928274
# I think we have a logic bug in resolve_doc
# Specifically, cur_doc.rev is always in the final vector
# clock of revisions that we supersede, even if it wasn't in
# conflicted_doc_revs. We still add it as a conflict, but the
# fact that _put_doc_if_newer propagates resolutions means I
# think that conflict could accidentally be resolved. We need
# to add a test for this case first. (create a rev, create a
# conflict, create another conflict, resolve the first rev
# and first conflict, then make sure that the resolved
# rev doesn't supersede the second conflict rev.) It *might*
# not matter, because the superseding rev is in as a
# conflict, but it does seem incorrect
new_rev = self._ensure_maximal_rev(cur_doc.rev,
conflicted_doc_revs)
superseded_revs = set(conflicted_doc_revs)
c = self._db_handle.cursor()
doc.rev = new_rev
if cur_doc.rev in superseded_revs:
self._put_and_update_indexes(cur_doc, doc)
else:
self._add_conflict(c, doc.doc_id, new_rev, doc.get_json())
# TODO: Is there some way that we could construct a rev that would
# end up in superseded_revs, such that we add a conflict, and
# then immediately delete it?
self._delete_conflicts(c, doc, superseded_revs)
def list_indexes(self):
"""Return the list of indexes and their definitions."""
c = self._db_handle.cursor()
# TODO: How do we test the ordering?
c.execute("SELECT name, field FROM index_definitions"
" ORDER BY name, offset")
definitions = []
cur_name = None
for name, field in c.fetchall():
if cur_name != name:
definitions.append((name, []))
cur_name = name
definitions[-1][-1].append(field)
return definitions
def _get_index_definition(self, index_name):
"""Return the stored definition for a given index_name."""
c = self._db_handle.cursor()
c.execute("SELECT field FROM index_definitions"
" WHERE name = ? ORDER BY offset", (index_name,))
fields = [x[0] for x in c.fetchall()]
if not fields:
raise errors.IndexDoesNotExist
return fields
@staticmethod
def _strip_glob(value):
"""Remove the trailing * from a value."""
assert value[-1] == '*'
return value[:-1]
def _format_query(self, definition, key_values):
# First, build the definition. We join the document_fields table
# against itself, as many times as the 'width' of our definition.
# We then do a query for each key_value, one-at-a-time.
# Note: All of these strings are static, we could cache them, etc.
tables = ["document_fields d%d" % i for i in range(len(definition))]
novalue_where = ["d.doc_id = d%d.doc_id"
" AND d%d.field_name = ?"
% (i, i) for i in range(len(definition))]
wildcard_where = [novalue_where[i] +
(" AND d%d.value NOT NULL" % (i,))
for i in range(len(definition))]
exact_where = [novalue_where[i] +
(" AND d%d.value = ?" % (i,))
for i in range(len(definition))]
like_where = [novalue_where[i] +
(" AND d%d.value GLOB ?" % (i,))
for i in range(len(definition))]
is_wildcard = False
# Merge the lists together, so that:
# [field1, field2, field3], [val1, val2, val3]
# Becomes:
# (field1, val1, field2, val2, field3, val3)
args = []
where = []
for idx, (field, value) in enumerate(zip(definition, key_values)):
args.append(field)
if value.endswith('*'):
if value == '*':
where.append(wildcard_where[idx])
else:
# This is a glob match
if is_wildcard:
# We can't have a partial wildcard following
# another wildcard
raise errors.InvalidGlobbing
where.append(like_where[idx])
args.append(value)
is_wildcard = True
else:
if is_wildcard:
raise errors.InvalidGlobbing
where.append(exact_where[idx])
args.append(value)
statement = (
"SELECT d.doc_id, d.doc_rev, d.content, count(c.doc_rev) FROM "
"document d, %s LEFT OUTER JOIN conflicts c ON c.doc_id = "
"d.doc_id WHERE %s GROUP BY d.doc_id, d.doc_rev, d.content ORDER "
"BY %s;" % (', '.join(tables), ' AND '.join(where), ', '.join(
['d%d.value' % i for i in range(len(definition))])))
return statement, args
def get_from_index(self, index_name, *key_values):
definition = self._get_index_definition(index_name)
if len(key_values) != len(definition):
raise errors.InvalidValueForIndex()
statement, args = self._format_query(definition, key_values)
c = self._db_handle.cursor()
try:
c.execute(statement, tuple(args))
except dbapi2.OperationalError, e:
raise dbapi2.OperationalError(
str(e) +
'\nstatement: %s\nargs: %s\n' % (statement, args))
res = c.fetchall()
results = []
for row in res:
doc = self._factory(row[0], row[1], row[2])
doc.has_conflicts = row[3] > 0
results.append(doc)
return results
def _format_range_query(self, definition, start_value, end_value):
tables = ["document_fields d%d" % i for i in range(len(definition))]
novalue_where = [
"d.doc_id = d%d.doc_id AND d%d.field_name = ?" % (i, i) for i in
range(len(definition))]
wildcard_where = [
novalue_where[i] + (" AND d%d.value NOT NULL" % (i,)) for i in
range(len(definition))]
like_where = [
novalue_where[i] + (
" AND (d%d.value < ? OR d%d.value GLOB ?)" % (i, i)) for i in
range(len(definition))]
range_where_lower = [
novalue_where[i] + (" AND d%d.value >= ?" % (i,)) for i in
range(len(definition))]
range_where_upper = [
novalue_where[i] + (" AND d%d.value <= ?" % (i,)) for i in
range(len(definition))]
args = []
where = []
if start_value:
if isinstance(start_value, basestring):
start_value = (start_value,)
if len(start_value) != len(definition):
raise errors.InvalidValueForIndex()
is_wildcard = False
for idx, (field, value) in enumerate(zip(definition, start_value)):
args.append(field)
if value.endswith('*'):
if value == '*':
where.append(wildcard_where[idx])
else:
# This is a glob match
if is_wildcard:
# We can't have a partial wildcard following
# another wildcard
raise errors.InvalidGlobbing
where.append(range_where_lower[idx])
args.append(self._strip_glob(value))
is_wildcard = True
else:
if is_wildcard:
raise errors.InvalidGlobbing
where.append(range_where_lower[idx])
args.append(value)
if end_value:
if isinstance(end_value, basestring):
end_value = (end_value,)
if len(end_value) != len(definition):
raise errors.InvalidValueForIndex()
is_wildcard = False
for idx, (field, value) in enumerate(zip(definition, end_value)):
args.append(field)
if value.endswith('*'):
if value == '*':
where.append(wildcard_where[idx])
else:
# This is a glob match
if is_wildcard:
# We can't have a partial wildcard following
# another wildcard
raise errors.InvalidGlobbing
where.append(like_where[idx])
args.append(self._strip_glob(value))
args.append(value)
is_wildcard = True
else:
if is_wildcard:
raise errors.InvalidGlobbing
where.append(range_where_upper[idx])
args.append(value)
statement = (
"SELECT d.doc_id, d.doc_rev, d.content, count(c.doc_rev) FROM "
"document d, %s LEFT OUTER JOIN conflicts c ON c.doc_id = "
"d.doc_id WHERE %s GROUP BY d.doc_id, d.doc_rev, d.content ORDER "
"BY %s;" % (', '.join(tables), ' AND '.join(where), ', '.join(
['d%d.value' % i for i in range(len(definition))])))
return statement, args
def get_range_from_index(self, index_name, start_value=None,
end_value=None):
"""Return all documents with key values in the specified range."""
definition = self._get_index_definition(index_name)
statement, args = self._format_range_query(
definition, start_value, end_value)
c = self._db_handle.cursor()
try:
c.execute(statement, tuple(args))
except dbapi2.OperationalError, e:
raise dbapi2.OperationalError(
str(e) +
'\nstatement: %s\nargs: %s\n' % (statement, args))
res = c.fetchall()
results = []
for row in res:
doc = self._factory(row[0], row[1], row[2])
doc.has_conflicts = row[3] > 0
results.append(doc)
return results
def get_index_keys(self, index_name):
c = self._db_handle.cursor()
definition = self._get_index_definition(index_name)
value_fields = ', '.join([
'd%d.value' % i for i in range(len(definition))])
tables = ["document_fields d%d" % i for i in range(len(definition))]
novalue_where = [
"d.doc_id = d%d.doc_id AND d%d.field_name = ?" % (i, i) for i in
range(len(definition))]
where = [
novalue_where[i] + (" AND d%d.value NOT NULL" % (i,)) for i in
range(len(definition))]
statement = (
"SELECT %s FROM document d, %s WHERE %s GROUP BY %s;" % (
value_fields, ', '.join(tables), ' AND '.join(where),
value_fields))
try:
c.execute(statement, tuple(definition))
except dbapi2.OperationalError, e:
raise dbapi2.OperationalError(
str(e) +
'\nstatement: %s\nargs: %s\n' % (statement, tuple(definition)))
return c.fetchall()
def delete_index(self, index_name):
with self._db_handle:
c = self._db_handle.cursor()
c.execute("DELETE FROM index_definitions WHERE name = ?",
(index_name,))
c.execute(
"DELETE FROM document_fields WHERE document_fields.field_name "
" NOT IN (SELECT field from index_definitions)")
class SQLiteSyncTarget(CommonSyncTarget):
def get_sync_info(self, source_replica_uid):
source_gen, source_trans_id = self._db._get_replica_gen_and_trans_id(
source_replica_uid)
my_gen, my_trans_id = self._db._get_generation_info()
return (
self._db._replica_uid, my_gen, my_trans_id, source_gen,
source_trans_id)
def record_sync_info(self, source_replica_uid, source_replica_generation,
source_replica_transaction_id):
if self._trace_hook:
self._trace_hook('record_sync_info')
self._db._set_replica_gen_and_trans_id(
source_replica_uid, source_replica_generation,
source_replica_transaction_id)
class SQLitePartialExpandDatabase(SQLiteDatabase):
"""An SQLite Backend that expands documents into a document_field table.
It stores the original document text in document.doc. For fields that are
indexed, the data goes into document_fields.
"""
_index_storage_value = 'expand referenced'
def _get_indexed_fields(self):
"""Determine what fields are indexed."""
c = self._db_handle.cursor()
c.execute("SELECT field FROM index_definitions")
return set([x[0] for x in c.fetchall()])
def _evaluate_index(self, raw_doc, field):
parser = query_parser.Parser()
getter = parser.parse(field)
return getter.get(raw_doc)
def _put_and_update_indexes(self, old_doc, doc):
c = self._db_handle.cursor()
if doc and not doc.is_tombstone():
raw_doc = json.loads(doc.get_json())
else:
raw_doc = {}
if old_doc is not None:
c.execute("UPDATE document SET doc_rev=?, content=?"
" WHERE doc_id = ?",
(doc.rev, doc.get_json(), doc.doc_id))
c.execute("DELETE FROM document_fields WHERE doc_id = ?",
(doc.doc_id,))
else:
c.execute("INSERT INTO document (doc_id, doc_rev, content)"
" VALUES (?, ?, ?)",
(doc.doc_id, doc.rev, doc.get_json()))
indexed_fields = self._get_indexed_fields()
if indexed_fields:
# It is expected that len(indexed_fields) is shorter than
# len(raw_doc)
getters = [(field, self._parse_index_definition(field))
for field in indexed_fields]
self._update_indexes(doc.doc_id, raw_doc, getters, c)
trans_id = self._allocate_transaction_id()
c.execute("INSERT INTO transaction_log(doc_id, transaction_id)"
" VALUES (?, ?)", (doc.doc_id, trans_id))
def create_index(self, index_name, *index_expressions):
with self._db_handle:
c = self._db_handle.cursor()
cur_fields = self._get_indexed_fields()
definition = [(index_name, idx, field)
for idx, field in enumerate(index_expressions)]
try:
c.executemany("INSERT INTO index_definitions VALUES (?, ?, ?)",
definition)
except dbapi2.IntegrityError as e:
stored_def = self._get_index_definition(index_name)
if stored_def == [x[-1] for x in definition]:
return
raise errors.IndexNameTakenError, e, sys.exc_info()[2]
new_fields = set(
[f for f in index_expressions if f not in cur_fields])
if new_fields:
self._update_all_indexes(new_fields)
def _iter_all_docs(self):
c = self._db_handle.cursor()
c.execute("SELECT doc_id, content FROM document")
while True:
next_rows = c.fetchmany()
if not next_rows:
break
for row in next_rows:
yield row
def _update_all_indexes(self, new_fields):
"""Iterate all the documents, and add content to document_fields.
:param new_fields: The index definitions that need to be added.
"""
getters = [(field, self._parse_index_definition(field))
for field in new_fields]
c = self._db_handle.cursor()
for doc_id, doc in self._iter_all_docs():
if doc is None:
continue
raw_doc = json.loads(doc)
self._update_indexes(doc_id, raw_doc, getters, c)
SQLiteDatabase.register_implementation(SQLitePartialExpandDatabase)
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