Fix parsing of row events for MySQL8 partitioned table

pymysqlreplication/row_event.py

@@ -57,7 +57,22 @@ def __init__(self, from_packet, event_size, table_map, ctl_connection, **kwargs)
                 self.event_type == BINLOG.DELETE_ROWS_EVENT_V2 or \
                 self.event_type == BINLOG.UPDATE_ROWS_EVENT_V2:
                 self.flags, self.extra_data_length = struct.unpack('<HH', self.packet.read(4))
-                self.extra_data = self.packet.read(self.extra_data_length / 8)
+                if self.extra_data_length > 2:
+                    self.extra_data_type = struct.unpack('<B', self.packet.read(1))[0]
+
+                    # ndb information
+                    if self.extra_data_type == 0:
+                        self.nbd_info_length, self.nbd_info_format = struct.unpack('<BB', self.packet.read(1))
+                        self.nbd_info = self.packet.read(self.nbd_info_length - 2)
+                    # partition information
+                    elif self.extra_data_type == 1:
+                        if self.event_type == BINLOG.UPDATE_ROWS_EVENT_V2:
+                            self.partition_id, self.source_partition_id = struct.unpack('<HH', self.packet.read(4))
+                        else:
+                            self.partition_id = struct.unpack('<H', self.packet.read(2))[0]
+                    # etc
+                    else:
+                        self.extra_data = self.packet.read(self.extra_info_length - 3)
         else:
             self.flags = struct.unpack('<H', self.packet.read(2))[0]
 

pymysqlreplication/tests/base.py

@@ -60,6 +60,10 @@ def isMySQL57(self):
         version = float(self.getMySQLVersion().rsplit('.', 1)[0])
         return version == 5.7
 
+    def isMySQL80AndMore(self):
+        version = float(self.getMySQLVersion().rsplit('.', 1)[0])
+        return version >= 8.0
+
     @property
     def supportsGTID(self):
         if not self.isMySQL56AndMore():

pymysqlreplication/tests/test_data_type.py

@@ -625,5 +625,21 @@ def test_zerofill(self):
         self.assertEqual(event.rows[0]["values"]["test4"], '0000000001')
         self.assertEqual(event.rows[0]["values"]["test5"], '00000000000000000001')
 
+    def test_partition_id(self):
+        if not self.isMySQL80AndMore():
+            self.skipTest("Not supported in this version of MySQL")
+        create_query = "CREATE TABLE test (id INTEGER) \
+            PARTITION BY RANGE (id) ( \
+                PARTITION p0 VALUES LESS THAN (1),   \
+                PARTITION p1 VALUES LESS THAN (2),   \
+                PARTITION p2 VALUES LESS THAN (3),   \
+                PARTITION p3 VALUES LESS THAN (4),   \
+                PARTITION p4 VALUES LESS THAN (5)    \
+            )"
+        insert_query = "INSERT INTO test (id) VALUES(3)"
+        event = self.create_and_insert_value(create_query, insert_query)
+        self.assertEqual(event.extra_data_type, 1)
+        self.assertEqual(event.partition_id, 3)
+
 if __name__ == "__main__":
     unittest.main()