diff --git a/scripts/port_to_maria.py b/scripts/port_to_maria.py
new file mode 100644
index 0000000000..6e0adf7030
--- /dev/null
+++ b/scripts/port_to_maria.py
@@ -0,0 +1,271 @@
+# -*- coding: utf-8 -*-
+# Copyright 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.
+
+from twisted.internet import defer, reactor
+from twisted.enterprise import adbapi
+
+from synapse.storage._base import LoggingTransaction, SQLBaseStore
+from synapse.storage.engines import create_engine
+
+import argparse
+import itertools
+import logging
+import yaml
+
+
+logger = logging.getLogger("port_to_maria")
+
+
+BINARY_COLUMNS = {
+ "event_content_hashes": ["hash"],
+ "event_reference_hashes": ["hash"],
+ "event_signatures": ["signature"],
+ "event_edge_hashes": ["hash"],
+ "events": ["content", "unrecognized_keys"],
+ "event_json": ["internal_metadata", "json"],
+ "application_services_txns": ["event_ids"],
+ "received_transactions": ["response_json"],
+ "sent_transactions": ["response_json"],
+ "server_tls_certificates": ["tls_certificate"],
+ "server_signature_keys": ["verify_key"],
+ "pushers": ["pushkey", "data"],
+ "user_filters": ["filter_json"],
+}
+
+UNICODE_COLUMNS = {
+ "events": ["content", "unrecognized_keys"],
+ "event_json": ["internal_metadata", "json"],
+ "users": ["password_hash"],
+}
+
+
+class Store(object):
+ def __init__(self, db_pool, engine):
+ self.db_pool = db_pool
+ self.engine = engine
+
+ _simple_insert_txn = SQLBaseStore.__dict__["_simple_insert_txn"]
+ _simple_insert = SQLBaseStore.__dict__["_simple_insert"]
+
+ _simple_select_onecol_txn = SQLBaseStore.__dict__["_simple_select_onecol_txn"]
+ _simple_select_onecol = SQLBaseStore.__dict__["_simple_select_onecol"]
+
+ _execute_and_decode = SQLBaseStore.__dict__["_execute_and_decode"]
+
+ def runInteraction(self, desc, func, *args, **kwargs):
+ def r(conn):
+ try:
+ i = 0
+ N = 5
+ while True:
+ try:
+ txn = conn.cursor()
+ return func(
+ LoggingTransaction(txn, desc, self.engine),
+ *args, **kwargs
+ )
+ except self.engine.module.DatabaseError as e:
+ if self.engine.is_deadlock(e):
+ logger.warn("[TXN DEADLOCK] {%s} %d/%d", desc, i, N)
+ if i < N:
+ i += 1
+ conn.rollback()
+ continue
+ raise
+ except Exception as e:
+ logger.debug("[TXN FAIL] {%s}", desc, e)
+ raise
+
+ return self.db_pool.runWithConnection(r)
+
+ def insert_many(self, table, headers, rows):
+ sql = "INSERT INTO %s (%s) VALUES (%s)" % (
+ table,
+ ", ".join(k for k in headers),
+ ", ".join("%s" for _ in headers)
+ )
+
+ def t(txn):
+ try:
+ txn.executemany(sql, rows)
+ except:
+ logger.exception(
+ "Failed to insert: %s",
+ table,
+ )
+ raise
+
+ return self.runInteraction("insert_many", t)
+
+
+def chunks(n):
+ for i in itertools.count(0, n):
+ yield range(i, i+n)
+
+
+@defer.inlineCallbacks
+def handle_table(table, sqlite_store, mysql_store):
+ N = 1000
+
+ select = "SELECT rowid, * FROM %s WHERE rowid >= ? ORDER BY rowid LIMIT ?" % (table,)
+
+ uni_col_names = UNICODE_COLUMNS.get(table, [])
+
+ def conv_uni(c):
+ return sqlite_store.engine.load_unicode(c)
+
+ next_chunk = 0
+ while True:
+ def r(txn):
+ txn.execute(select, (next_chunk, N,))
+ rows = txn.fetchall()
+ headers = [column[0] for column in txn.description]
+
+ return headers, rows
+
+ headers, rows = yield sqlite_store.runInteraction("select", r)
+
+ logger.info("Got %d rows for %s", len(rows), table)
+
+ if rows:
+ uni_cols = [i for i, h in enumerate(headers) if h in uni_col_names]
+ next_chunk = rows[-1][0] + 1
+
+ for i, row in enumerate(rows):
+ rows[i] = tuple(
+ mysql_store.engine.encode_parameter(
+ conv_uni(col) if j in uni_cols else col
+ )
+ for j, col in enumerate(row)
+ if j > 0
+ )
+
+ yield mysql_store.insert_many(table, headers[1:], rows)
+ else:
+ return
+
+
+def setup_db(db_config, database_engine):
+ db_conn = database_engine.module.connect(
+ **{
+ k: v for k, v in db_config.get("args", {}).items()
+ if not k.startswith("cp_")
+ }
+ )
+
+ database_engine.prepare_database(db_conn)
+
+ db_conn.commit()
+
+
+@defer.inlineCallbacks
+def main(sqlite_config, mysql_config):
+ try:
+ sqlite_db_pool = adbapi.ConnectionPool(
+ sqlite_config["name"],
+ **sqlite_config["args"]
+ )
+
+ mysql_db_pool = adbapi.ConnectionPool(
+ mysql_config["name"],
+ **mysql_config["args"]
+ )
+
+ sqlite_engine = create_engine("sqlite3")
+ mysql_engine = create_engine("mysql.connector")
+
+ sqlite_store = Store(sqlite_db_pool, sqlite_engine)
+ mysql_store = Store(mysql_db_pool, mysql_engine)
+
+ # Step 1. Set up mysql database.
+ logger.info("Preparing sqlite database...")
+ setup_db(sqlite_config, sqlite_engine)
+
+ logger.info("Preparing mysql database...")
+ setup_db(mysql_config, mysql_engine)
+
+ # Step 2. Get tables.
+ logger.info("Fetching tables...")
+ tables = yield sqlite_store._simple_select_onecol(
+ table="sqlite_master",
+ keyvalues={
+ "type": "table",
+ },
+ retcol="name",
+ )
+
+ logger.info("Found %d tables", len(tables))
+
+ # Process tables.
+ yield defer.gatherResults(
+ [
+ handle_table(table, sqlite_store, mysql_store)
+ for table in tables
+ if table not in ["schema_version", "applied_schema_deltas"]
+ and not table.startswith("sqlite_")
+ ],
+ consumeErrors=True,
+ )
+
+ # for table in ["current_state_events"]: # tables:
+ # if table not in ["schema_version", "applied_schema_deltas"]:
+ # if not table.startswith("sqlite_"):
+ # yield handle_table(table, sqlite_store, mysql_store)
+ except:
+ logger.exception("")
+ finally:
+ reactor.stop()
+
+
+if __name__ == "__main__":
+ parser = argparse.ArgumentParser()
+ parser.add_argument("--sqlite-database")
+ parser.add_argument(
+ "--mysql-config", type=argparse.FileType('r'),
+ )
+
+ args = parser.parse_args()
+ logging.basicConfig(level=logging.INFO)
+
+ sqlite_config = {
+ "name": "sqlite3",
+ "args": {
+ "database": args.sqlite_database,
+ "cp_min": 1,
+ "cp_max": 1,
+ "check_same_thread": False,
+ },
+ }
+
+ mysql_config = yaml.safe_load(args.mysql_config)
+ mysql_config["args"].update({
+ "sql_mode": "TRADITIONAL",
+ "charset": "utf8mb4",
+ "use_unicode": True,
+ "collation": "utf8mb4_bin",
+ })
+
+ import codecs
+ codecs.register(
+ lambda name: codecs.lookup('utf8') if name == "utf8mb4" else None
+ )
+
+ reactor.callWhenRunning(
+ main,
+ sqlite_config=sqlite_config,
+ mysql_config=mysql_config,
+ )
+
+ reactor.run()
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