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Merge pull request #300 from matrix-org/erikj/store_engine

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Split out the schema preparation and update logic into its own module
This commit is contained in:
Erik Johnston 2015-10-13 14:01:15 +01:00
commit 7ec9be9c53
6 changed files with 402 additions and 381 deletions
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5
synapse/app/homeserver.py
View File

@ -35,9 +35,8 @@ if __name__ == '__main__':
from synapse.storage.engines import create_engine, IncorrectDatabaseSetup
from synapse.storage import (
are_all_users_on_domain, UpgradeDatabaseException,
)
from synapse.storage import are_all_users_on_domain
from synapse.storage.prepare_database import UpgradeDatabaseException
from synapse.server import HomeServer

375
synapse/storage/__init__.py
View File

@ -42,22 +42,12 @@ from .end_to_end_keys import EndToEndKeyStore
from .receipts import ReceiptsStore
import fnmatch
import imp
import logging
import os
import re
logger = logging.getLogger(__name__)
# Remember to update this number every time a change is made to database
# schema files, so the users will be informed on server restarts.
SCHEMA_VERSION = 24
dir_path = os.path.abspath(os.path.dirname(__file__))
# Number of msec of granularity to store the user IP 'last seen' time. Smaller
# times give more inserts into the database even for readonly API hits
# 120 seconds == 2 minutes
@ -158,371 +148,6 @@ class DataStore(RoomMemberStore, RoomStore,
)
def read_schema(path):
""" Read the named database schema.
Args:
path: Path of the database schema.
Returns:
A string containing the database schema.
"""
with open(path) as schema_file:
return schema_file.read()
class PrepareDatabaseException(Exception):
pass
class UpgradeDatabaseException(PrepareDatabaseException):
pass
def prepare_database(db_conn, database_engine):
"""Prepares a database for usage. Will either create all necessary tables
or upgrade from an older schema version.
"""
try:
cur = db_conn.cursor()
version_info = _get_or_create_schema_state(cur, database_engine)
if version_info:
user_version, delta_files, upgraded = version_info
_upgrade_existing_database(
cur, user_version, delta_files, upgraded, database_engine
)
else:
_setup_new_database(cur, database_engine)
# cur.execute("PRAGMA user_version = %d" % (SCHEMA_VERSION,))
cur.close()
db_conn.commit()
except:
db_conn.rollback()
raise
def _setup_new_database(cur, database_engine):
"""Sets up the database by finding a base set of "full schemas" and then
applying any necessary deltas.
The "full_schemas" directory has subdirectories named after versions. This
function searches for the highest version less than or equal to
`SCHEMA_VERSION` and executes all .sql files in that directory.
The function will then apply all deltas for all versions after the base
version.
Example directory structure:
schema/
delta/
...
full_schemas/
3/
test.sql
...
11/
foo.sql
bar.sql
...
In the example foo.sql and bar.sql would be run, and then any delta files
for versions strictly greater than 11.
"""
current_dir = os.path.join(dir_path, "schema", "full_schemas")
directory_entries = os.listdir(current_dir)
valid_dirs = []
pattern = re.compile(r"^\d+(\.sql)?$")
for filename in directory_entries:
match = pattern.match(filename)
abs_path = os.path.join(current_dir, filename)
if match and os.path.isdir(abs_path):
ver = int(match.group(0))
if ver <= SCHEMA_VERSION:
valid_dirs.append((ver, abs_path))
else:
logger.warn("Unexpected entry in 'full_schemas': %s", filename)
if not valid_dirs:
raise PrepareDatabaseException(
"Could not find a suitable base set of full schemas"
)
max_current_ver, sql_dir = max(valid_dirs, key=lambda x: x[0])
logger.debug("Initialising schema v%d", max_current_ver)
directory_entries = os.listdir(sql_dir)
for filename in fnmatch.filter(directory_entries, "*.sql"):
sql_loc = os.path.join(sql_dir, filename)
logger.debug("Applying schema %s", sql_loc)
executescript(cur, sql_loc)
cur.execute(
database_engine.convert_param_style(
"INSERT INTO schema_version (version, upgraded)"
" VALUES (?,?)"
),
(max_current_ver, False,)
)
_upgrade_existing_database(
cur,
current_version=max_current_ver,
applied_delta_files=[],
upgraded=False,
database_engine=database_engine,
)
def _upgrade_existing_database(cur, current_version, applied_delta_files,
upgraded, database_engine):
"""Upgrades an existing database.
Delta files can either be SQL stored in *.sql files, or python modules
in *.py.
There can be multiple delta files per version. Synapse will keep track of
which delta files have been applied, and will apply any that haven't been
even if there has been no version bump. This is useful for development
where orthogonal schema changes may happen on separate branches.
Different delta files for the same version *must* be orthogonal and give
the same result when applied in any order. No guarantees are made on the
order of execution of these scripts.
This is a no-op of current_version == SCHEMA_VERSION.
Example directory structure:
schema/
delta/
11/
foo.sql
...
12/
foo.sql
bar.py
...
full_schemas/
...
In the example, if current_version is 11, then foo.sql will be run if and
only if `upgraded` is True. Then `foo.sql` and `bar.py` would be run in
some arbitrary order.
Args:
cur (Cursor)
current_version (int): The current version of the schema.
applied_delta_files (list): A list of deltas that have already been
applied.
upgraded (bool): Whether the current version was generated by having
applied deltas or from full schema file. If `True` the function
will never apply delta files for the given `current_version`, since
the current_version wasn't generated by applying those delta files.
"""
if current_version > SCHEMA_VERSION:
raise ValueError(
"Cannot use this database as it is too " +
"new for the server to understand"
)
start_ver = current_version
if not upgraded:
start_ver += 1
logger.debug("applied_delta_files: %s", applied_delta_files)
for v in range(start_ver, SCHEMA_VERSION + 1):
logger.debug("Upgrading schema to v%d", v)
delta_dir = os.path.join(dir_path, "schema", "delta", str(v))
try:
directory_entries = os.listdir(delta_dir)
except OSError:
logger.exception("Could not open delta dir for version %d", v)
raise UpgradeDatabaseException(
"Could not open delta dir for version %d" % (v,)
)
directory_entries.sort()
for file_name in directory_entries:
relative_path = os.path.join(str(v), file_name)
logger.debug("Found file: %s", relative_path)
if relative_path in applied_delta_files:
continue
absolute_path = os.path.join(
dir_path, "schema", "delta", relative_path,
)
root_name, ext = os.path.splitext(file_name)
if ext == ".py":
# This is a python upgrade module. We need to import into some
# package and then execute its `run_upgrade` function.
module_name = "synapse.storage.v%d_%s" % (
v, root_name
)
with open(absolute_path) as python_file:
module = imp.load_source(
module_name, absolute_path, python_file
)
logger.debug("Running script %s", relative_path)
module.run_upgrade(cur, database_engine)
elif ext == ".pyc":
# Sometimes .pyc files turn up anyway even though we've
# disabled their generation; e.g. from distribution package
# installers. Silently skip it
pass
elif ext == ".sql":
# A plain old .sql file, just read and execute it
logger.debug("Applying schema %s", relative_path)
executescript(cur, absolute_path)
else:
# Not a valid delta file.
logger.warn(
"Found directory entry that did not end in .py or"
" .sql: %s",
relative_path,
)
continue
# Mark as done.
cur.execute(
database_engine.convert_param_style(
"INSERT INTO applied_schema_deltas (version, file)"
" VALUES (?,?)",
),
(v, relative_path)
)
cur.execute("DELETE FROM schema_version")
cur.execute(
database_engine.convert_param_style(
"INSERT INTO schema_version (version, upgraded)"
" VALUES (?,?)",
),
(v, True)
)
def get_statements(f):
statement_buffer = ""
in_comment = False # If we're in a /* ... */ style comment
for line in f:
line = line.strip()
if in_comment:
# Check if this line contains an end to the comment
comments = line.split("*/", 1)
if len(comments) == 1:
continue
line = comments[1]
in_comment = False
# Remove inline block comments
line = re.sub(r"/\*.*\*/", " ", line)
# Does this line start a comment?
comments = line.split("/*", 1)
if len(comments) > 1:
line = comments[0]
in_comment = True
# Deal with line comments
line = line.split("--", 1)[0]
line = line.split("//", 1)[0]
# Find *all* semicolons. We need to treat first and last entry
# specially.
statements = line.split(";")
# We must prepend statement_buffer to the first statement
first_statement = "%s %s" % (
statement_buffer.strip(),
statements[0].strip()
)
statements[0] = first_statement
# Every entry, except the last, is a full statement
for statement in statements[:-1]:
yield statement.strip()
# The last entry did *not* end in a semicolon, so we store it for the
# next semicolon we find
statement_buffer = statements[-1].strip()
def executescript(txn, schema_path):
with open(schema_path, 'r') as f:
for statement in get_statements(f):
txn.execute(statement)
def _get_or_create_schema_state(txn, database_engine):
# Bluntly try creating the schema_version tables.
schema_path = os.path.join(
dir_path, "schema", "schema_version.sql",
)
executescript(txn, schema_path)
txn.execute("SELECT version, upgraded FROM schema_version")
row = txn.fetchone()
current_version = int(row[0]) if row else None
upgraded = bool(row[1]) if row else None
if current_version:
txn.execute(
database_engine.convert_param_style(
"SELECT file FROM applied_schema_deltas WHERE version >= ?"
),
(current_version,)
)
applied_deltas = [d for d, in txn.fetchall()]
return current_version, applied_deltas, upgraded
return None
def prepare_sqlite3_database(db_conn):
"""This function should be called before `prepare_database` on sqlite3
databases.
Since we changed the way we store the current schema version and handle
updates to schemas, we need a way to upgrade from the old method to the
new. This only affects sqlite databases since they were the only ones
supported at the time.
"""
with db_conn:
schema_path = os.path.join(
dir_path, "schema", "schema_version.sql",
)
create_schema = read_schema(schema_path)
db_conn.executescript(create_schema)
c = db_conn.execute("SELECT * FROM schema_version")
rows = c.fetchall()
c.close()
if not rows:
c = db_conn.execute("PRAGMA user_version")
row = c.fetchone()
c.close()
if row and row[0]:
db_conn.execute(
"REPLACE INTO schema_version (version, upgraded)"
" VALUES (?,?)",
(row[0], False)
)
def are_all_users_on_domain(txn, database_engine, domain):
sql = database_engine.convert_param_style(
"SELECT COUNT(*) FROM users WHERE name NOT LIKE ?"

2
synapse/storage/engines/postgres.py
View File

@ -13,7 +13,7 @@
# See the License for the specific language governing permissions and
# limitations under the License.
from synapse.storage import prepare_database
from synapse.storage.prepare_database import prepare_database
from ._base import IncorrectDatabaseSetup

4
synapse/storage/engines/sqlite3.py
View File

@ -13,7 +13,9 @@
# See the License for the specific language governing permissions and
# limitations under the License.
from synapse.storage import prepare_database, prepare_sqlite3_database
from synapse.storage.prepare_database import (
prepare_database, prepare_sqlite3_database
)
class Sqlite3Engine(object):

395
synapse/storage/prepare_database.py Normal file
View File

@ -0,0 +1,395 @@
# -*- coding: utf-8 -*-
# Copyright 2014, 2015 OpenMarket Ltd
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import fnmatch
import imp
import logging
import os
import re
logger = logging.getLogger(__name__)
# Remember to update this number every time a change is made to database
# schema files, so the users will be informed on server restarts.
SCHEMA_VERSION = 24
dir_path = os.path.abspath(os.path.dirname(__file__))
def read_schema(path):
""" Read the named database schema.
Args:
path: Path of the database schema.
Returns:
A string containing the database schema.
"""
with open(path) as schema_file:
return schema_file.read()
class PrepareDatabaseException(Exception):
pass
class UpgradeDatabaseException(PrepareDatabaseException):
pass
def prepare_database(db_conn, database_engine):
"""Prepares a database for usage. Will either create all necessary tables
or upgrade from an older schema version.
"""
try:
cur = db_conn.cursor()
version_info = _get_or_create_schema_state(cur, database_engine)
if version_info:
user_version, delta_files, upgraded = version_info
_upgrade_existing_database(
cur, user_version, delta_files, upgraded, database_engine
)
else:
_setup_new_database(cur, database_engine)
# cur.execute("PRAGMA user_version = %d" % (SCHEMA_VERSION,))
cur.close()
db_conn.commit()
except:
db_conn.rollback()
raise
def _setup_new_database(cur, database_engine):
"""Sets up the database by finding a base set of "full schemas" and then
applying any necessary deltas.
The "full_schemas" directory has subdirectories named after versions. This
function searches for the highest version less than or equal to
`SCHEMA_VERSION` and executes all .sql files in that directory.
The function will then apply all deltas for all versions after the base
version.
Example directory structure:
schema/
delta/
...
full_schemas/
3/
test.sql
...
11/
foo.sql
bar.sql
...
In the example foo.sql and bar.sql would be run, and then any delta files
for versions strictly greater than 11.
"""
current_dir = os.path.join(dir_path, "schema", "full_schemas")
directory_entries = os.listdir(current_dir)
valid_dirs = []
pattern = re.compile(r"^\d+(\.sql)?$")
for filename in directory_entries:
match = pattern.match(filename)
abs_path = os.path.join(current_dir, filename)
if match and os.path.isdir(abs_path):
ver = int(match.group(0))
if ver <= SCHEMA_VERSION:
valid_dirs.append((ver, abs_path))
else:
logger.warn("Unexpected entry in 'full_schemas': %s", filename)
if not valid_dirs:
raise PrepareDatabaseException(
"Could not find a suitable base set of full schemas"
)
max_current_ver, sql_dir = max(valid_dirs, key=lambda x: x[0])
logger.debug("Initialising schema v%d", max_current_ver)
directory_entries = os.listdir(sql_dir)
for filename in fnmatch.filter(directory_entries, "*.sql"):
sql_loc = os.path.join(sql_dir, filename)
logger.debug("Applying schema %s", sql_loc)
executescript(cur, sql_loc)
cur.execute(
database_engine.convert_param_style(
"INSERT INTO schema_version (version, upgraded)"
" VALUES (?,?)"
),
(max_current_ver, False,)
)
_upgrade_existing_database(
cur,
current_version=max_current_ver,
applied_delta_files=[],
upgraded=False,
database_engine=database_engine,
)
def _upgrade_existing_database(cur, current_version, applied_delta_files,
upgraded, database_engine):
"""Upgrades an existing database.
Delta files can either be SQL stored in *.sql files, or python modules
in *.py.
There can be multiple delta files per version. Synapse will keep track of
which delta files have been applied, and will apply any that haven't been
even if there has been no version bump. This is useful for development
where orthogonal schema changes may happen on separate branches.
Different delta files for the same version *must* be orthogonal and give
the same result when applied in any order. No guarantees are made on the
order of execution of these scripts.
This is a no-op of current_version == SCHEMA_VERSION.
Example directory structure:
schema/
delta/
11/
foo.sql
...
12/
foo.sql
bar.py
...
full_schemas/
...
In the example, if current_version is 11, then foo.sql will be run if and
only if `upgraded` is True. Then `foo.sql` and `bar.py` would be run in
some arbitrary order.
Args:
cur (Cursor)
current_version (int): The current version of the schema.
applied_delta_files (list): A list of deltas that have already been
applied.
upgraded (bool): Whether the current version was generated by having
applied deltas or from full schema file. If `True` the function
will never apply delta files for the given `current_version`, since
the current_version wasn't generated by applying those delta files.
"""
if current_version > SCHEMA_VERSION:
raise ValueError(
"Cannot use this database as it is too " +
"new for the server to understand"
)
start_ver = current_version
if not upgraded:
start_ver += 1
logger.debug("applied_delta_files: %s", applied_delta_files)
for v in range(start_ver, SCHEMA_VERSION + 1):
logger.debug("Upgrading schema to v%d", v)
delta_dir = os.path.join(dir_path, "schema", "delta", str(v))
try:
directory_entries = os.listdir(delta_dir)
except OSError:
logger.exception("Could not open delta dir for version %d", v)
raise UpgradeDatabaseException(
"Could not open delta dir for version %d" % (v,)
)
directory_entries.sort()
for file_name in directory_entries:
relative_path = os.path.join(str(v), file_name)
logger.debug("Found file: %s", relative_path)
if relative_path in applied_delta_files:
continue
absolute_path = os.path.join(
dir_path, "schema", "delta", relative_path,
)
root_name, ext = os.path.splitext(file_name)
if ext == ".py":
# This is a python upgrade module. We need to import into some
# package and then execute its `run_upgrade` function.
module_name = "synapse.storage.v%d_%s" % (
v, root_name
)
with open(absolute_path) as python_file:
module = imp.load_source(
module_name, absolute_path, python_file
)
logger.debug("Running script %s", relative_path)
module.run_upgrade(cur, database_engine)
elif ext == ".pyc":
# Sometimes .pyc files turn up anyway even though we've
# disabled their generation; e.g. from distribution package
# installers. Silently skip it
pass
elif ext == ".sql":
# A plain old .sql file, just read and execute it
logger.debug("Applying schema %s", relative_path)
executescript(cur, absolute_path)
else:
# Not a valid delta file.
logger.warn(
"Found directory entry that did not end in .py or"
" .sql: %s",
relative_path,
)
continue
# Mark as done.
cur.execute(
database_engine.convert_param_style(
"INSERT INTO applied_schema_deltas (version, file)"
" VALUES (?,?)",
),
(v, relative_path)
)
cur.execute("DELETE FROM schema_version")
cur.execute(
database_engine.convert_param_style(
"INSERT INTO schema_version (version, upgraded)"
" VALUES (?,?)",
),
(v, True)
)
def get_statements(f):
statement_buffer = ""
in_comment = False # If we're in a /* ... */ style comment
for line in f:
line = line.strip()
if in_comment:
# Check if this line contains an end to the comment
comments = line.split("*/", 1)
if len(comments) == 1:
continue
line = comments[1]
in_comment = False
# Remove inline block comments
line = re.sub(r"/\*.*\*/", " ", line)
# Does this line start a comment?
comments = line.split("/*", 1)
if len(comments) > 1:
line = comments[0]
in_comment = True
# Deal with line comments
line = line.split("--", 1)[0]
line = line.split("//", 1)[0]
# Find *all* semicolons. We need to treat first and last entry
# specially.
statements = line.split(";")
# We must prepend statement_buffer to the first statement
first_statement = "%s %s" % (
statement_buffer.strip(),
statements[0].strip()
)
statements[0] = first_statement
# Every entry, except the last, is a full statement
for statement in statements[:-1]:
yield statement.strip()
# The last entry did *not* end in a semicolon, so we store it for the
# next semicolon we find
statement_buffer = statements[-1].strip()
def executescript(txn, schema_path):
with open(schema_path, 'r') as f:
for statement in get_statements(f):
txn.execute(statement)
def _get_or_create_schema_state(txn, database_engine):
# Bluntly try creating the schema_version tables.
schema_path = os.path.join(
dir_path, "schema", "schema_version.sql",
)
executescript(txn, schema_path)
txn.execute("SELECT version, upgraded FROM schema_version")
row = txn.fetchone()
current_version = int(row[0]) if row else None
upgraded = bool(row[1]) if row else None
if current_version:
txn.execute(
database_engine.convert_param_style(
"SELECT file FROM applied_schema_deltas WHERE version >= ?"
),
(current_version,)
)
applied_deltas = [d for d, in txn.fetchall()]
return current_version, applied_deltas, upgraded
return None
def prepare_sqlite3_database(db_conn):
"""This function should be called before `prepare_database` on sqlite3
databases.
Since we changed the way we store the current schema version and handle
updates to schemas, we need a way to upgrade from the old method to the
new. This only affects sqlite databases since they were the only ones
supported at the time.
"""
with db_conn:
schema_path = os.path.join(
dir_path, "schema", "schema_version.sql",
)
create_schema = read_schema(schema_path)
db_conn.executescript(create_schema)
c = db_conn.execute("SELECT * FROM schema_version")
rows = c.fetchall()
c.close()
if not rows:
c = db_conn.execute("PRAGMA user_version")
row = c.fetchone()
c.close()
if row and row[0]:
db_conn.execute(
"REPLACE INTO schema_version (version, upgraded)"
" VALUES (?,?)",
(row[0], False)
)

2
tests/utils.py
View File

@ -16,7 +16,7 @@
from synapse.http.server import HttpServer
from synapse.api.errors import cs_error, CodeMessageException, StoreError
from synapse.api.constants import EventTypes
from synapse.storage import prepare_database
from synapse.storage.prepare_database import prepare_database
from synapse.storage.engines import create_engine
from synapse.server import HomeServer