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mysql-binlog-connector-rust

Overview

• A simple but strong lib to dump mysql binlog (binlog_format=ROW) and parse Row Based Replication Events in RUST with async IO.

Supported mysql versions

• mysql 5.6 (tested in mysql:5.6.51)
• mysql 5.7 (tested in mysql:5.7.40)
• mysql 8.0 (tested in mysql:8.0.31)

Supported replication type

• binlog-file-position-based replication
• gtid-based replication

Supported event types

• FORMAT_DESCRIPTION_EVENT

• ROTATE_EVENT

• PREVIOUS_GTIDS_LOG_EVENT

• GTID_LOG_EVENT

• QUERY_EVENT

• XID_EVENT

• XA_PREPARE_LOG_EVENT

• TRANSACTION_PAYLOAD_EVENT

• ROWS_QUERY_LOG_EVENT

• TABLE_MAP_EVENT

• WRITE_ROWS_EVENT_V1

• WRITE_ROWS_EVENT

• UPDATE_ROWS_EVENT_V1

• UPDATE_ROWS_EVENT

• DELETE_ROWS_EVENT_V1

• DELETE_ROWS_EVENT

• for more details, refer to: mysql doc

Mapping between mysql columns and rust types

• for CHAR / VARCHAR columns, since binlog contains no charset information, we just get raw bytes and store them in ColumnValue::String(Vec<u8>) objects, you may need to convert them into strings based on column metadatas for further usage.
• for UNSIGNED numeric columns, since binlog contains no unsigned flags, we just parse them as signed numerics, you may need to convert them into unsigned values based on column metadatas for further usage.
• for JSON columns, we get raw bytes and store them in ColumnValue::Json(Vec<u8>) objects, we also provide a default deserializer "JsonBinary" to parse them into strings, find example later in this doc.

Quick start

Run tests

• start a mysql, enable binlog without binlog-transaction-compression :

docker run -d --name mysql57 \
--platform linux/x86_64 \
-it --restart=always \
-p 3307:3306 \
-e MYSQL_ROOT_PASSWORD="123456" \
mysql:5.7.40 \
--lower_case_table_names=1 \
--character-set-server=utf8 \
--collation-server=utf8_general_ci \
--datadir=/var/lib/mysql \
--user=mysql \
--server_id=1 \
--log_bin=/var/lib/mysql/mysql-bin.log \
--max_binlog_size=100M \
--gtid_mode=ON \
--enforce_gtid_consistency=ON \
--binlog_format=ROW 

• start a mysql, enable binlog with binlog-transaction-compression

docker run -d --name mysql80 \
--platform linux/x86_64 \
-it  --restart=always \
-p 3308:3306 -e MYSQL_ROOT_PASSWORD="123456" \
 mysql:8.0.31 \
 --lower_case_table_names=1 \
 --character-set-server=utf8 \
 --collation-server=utf8_general_ci \
 --datadir=/var/lib/mysql \
 --user=mysql \
 --server_id=1 \
 --log_bin=/var/lib/mysql/mysql-bin.log \
 --max_binlog_size=100M \
 --gtid_mode=ON \
 --enforce_gtid_consistency=ON \
 --binlog_format=ROW \
 --binlog-transaction-compression \
 --binlog_rows_query_log_events=ON \
 --default_authentication_plugin=mysql_native_password \
 --default_time_zone="+08:00"

• update configs in tests/.env

db_url=mysql://root:123456@127.0.0.1:3307
server_id=200
default_db="db_test"
default_tb="tb_test"
binlog_parse_millis=100

• run tests

cargo test --package mysql-binlog-connector-rust --test integration_test

• each test will:
•   execute sqls to create tables and generate binlogs
•   dump and parse binlogs
•   wait binlog_parse_millis for all binlogs to be parsed
• you may increase binlog_parse_millis for big transactions

Examples

fn main() {
    block_on(dump_and_parse())
}

async fn dump_and_parse() {
    let env_path = env::current_dir().unwrap().join("example/src/.env");
    dotenv::from_path(env_path).unwrap();
    let url = env::var("db_url").unwrap();
    let server_id: u64 = env::var("server_id").unwrap().parse().unwrap();
    let binlog_filename = env::var("binlog_filename").unwrap();
    let binlog_position: u32 = env::var("binlog_position").unwrap().parse().unwrap();
    let gtid_enabled: bool = env::var("gtid_enabled").unwrap().parse().unwrap();
    let gtid_set = env::var("gtid_set").unwrap();

    let mut client = BinlogClient {
        url,
        binlog_filename,
        binlog_position,
        server_id,
        gtid_enabled,
        gtid_set,
    };

    let mut stream = client.connect().await.unwrap();

    loop {
        let (header, data) = stream.read().await.unwrap();
        println!("header: {:?}", header);
        println!("data: {:?}", data);
        println!();
    }
}

Example 1: parse binlogs with binlog-transaction-compression disabled

• execute sqls

flush logs;

SET autocommit=0; 
CREATE DATABASE test_db;
USE test_db;
CREATE TABLE test_tb(id INT, value INT);
INSERT INTO test_tb VALUES(1,1),(2,2),(3,3),(4,4);
UPDATE test_tb SET value=3 WHERE id in(1,2);
DELETE FROM test_tb WHERE id in (1,2);
TRUNCATE TABLE test_tb;
DROP TABLE test_tb;
commit;

• show binlog events

mysql> show binary logs;
+------------------+-----------+
| Log_name         | File_size |
+------------------+-----------+
| mysql-bin.000050 |      1255 |

mysql> show binlog events in 'mysql-bin.000050';
+------------------+------+----------------+-----------+-------------+------------------------------------------------------------------------+
| Log_name         | Pos  | Event_type     | Server_id | End_log_pos | Info                                                                   |
+------------------+------+----------------+-----------+-------------+------------------------------------------------------------------------+
| mysql-bin.000050 |    4 | Format_desc    |         1 |         123 | Server ver: 5.7.40-log, Binlog ver: 4                                  |
| mysql-bin.000050 |  123 | Previous_gtids |         1 |         194 | 50dc6874-13d3-11ee-a17a-0242ac110002:1-176027                          |
| mysql-bin.000050 |  194 | Gtid           |         1 |         259 | SET @@SESSION.GTID_NEXT= '50dc6874-13d3-11ee-a17a-0242ac110002:176028' |
| mysql-bin.000050 |  259 | Query          |         1 |         378 | use `test_db`; CREATE TABLE test_tb(id INT, value INT)                 |
| mysql-bin.000050 |  378 | Gtid           |         1 |         443 | SET @@SESSION.GTID_NEXT= '50dc6874-13d3-11ee-a17a-0242ac110002:176029' |
| mysql-bin.000050 |  443 | Query          |         1 |         518 | BEGIN                                                                  |
| mysql-bin.000050 |  518 | Table_map      |         1 |         572 | table_id: 12832 (test_db.test_tb)                                      |
| mysql-bin.000050 |  572 | Write_rows     |         1 |         643 | table_id: 12832 flags: STMT_END_F                                      |
| mysql-bin.000050 |  643 | Table_map      |         1 |         697 | table_id: 12832 (test_db.test_tb)                                      |
| mysql-bin.000050 |  697 | Update_rows    |         1 |         769 | table_id: 12832 flags: STMT_END_F                                      |
| mysql-bin.000050 |  769 | Table_map      |         1 |         823 | table_id: 12832 (test_db.test_tb)                                      |
| mysql-bin.000050 |  823 | Delete_rows    |         1 |         876 | table_id: 12832 flags: STMT_END_F                                      |
| mysql-bin.000050 |  876 | Xid            |         1 |         907 | COMMIT /* xid=13739 */                                                 |
| mysql-bin.000050 |  907 | Gtid           |         1 |         972 | SET @@SESSION.GTID_NEXT= '50dc6874-13d3-11ee-a17a-0242ac110002:176030' |
| mysql-bin.000050 |  972 | Query          |         1 |        1064 | use `test_db`; TRUNCATE TABLE test_tb                                  |
| mysql-bin.000050 | 1064 | Gtid           |         1 |        1129 | SET @@SESSION.GTID_NEXT= '50dc6874-13d3-11ee-a17a-0242ac110002:176031' |
| mysql-bin.000050 | 1129 | Query          |         1 |        1255 | use `test_db`; DROP TABLE `test_tb` /* generated by server */          |
+------------------+------+----------------+-----------+-------------+------------------------------------------------------------------------+

• binlogs parsed

header: EventHeader { timestamp: 0, event_type: 4, server_id: 1, event_length: 47, next_event_position: 0, event_flags: 32 }
data: Rotate(RotateEvent { binlog_filename: "mysql-bin.000050", binlog_position: 194 })

header: EventHeader { timestamp: 1704443761, event_type: 15, server_id: 1, event_length: 119, next_event_position: 0, event_flags: 0 }
data: FormatDescription(FormatDescriptionEvent { binlog_version: 4, server_version: "5.7.40-log\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0", create_timestamp: 0, header_length: 19, checksum_type: CRC32 })

header: EventHeader { timestamp: 1704443769, event_type: 33, server_id: 1, event_length: 65, next_event_position: 259, event_flags: 0 }
data: Gtid(GtidEvent { flags: 1, gtid: "50dc6874-13d3-11ee-a17a-0242ac110002:176028" })

header: EventHeader { timestamp: 1704443769, event_type: 2, server_id: 1, event_length: 119, next_event_position: 378, event_flags: 0 }
data: Query(QueryEvent { thread_id: 493, exec_time: 0, error_code: 0, schema: "test_db", query: "CREATE TABLE test_tb(id INT, value INT)" })

header: EventHeader { timestamp: 1704443769, event_type: 33, server_id: 1, event_length: 65, next_event_position: 443, event_flags: 0 }
data: Gtid(GtidEvent { flags: 0, gtid: "50dc6874-13d3-11ee-a17a-0242ac110002:176029" })

header: EventHeader { timestamp: 1704443769, event_type: 2, server_id: 1, event_length: 75, next_event_position: 518, event_flags: 8 }
data: Query(QueryEvent { thread_id: 493, exec_time: 0, error_code: 0, schema: "test_db", query: "BEGIN" })

header: EventHeader { timestamp: 1704443769, event_type: 19, server_id: 1, event_length: 54, next_event_position: 572, event_flags: 0 }
data: TableMap(TableMapEvent { table_id: 12832, database_name: "test_db", table_name: "test_tb", column_types: [3, 3], column_metas: [0, 0], null_bits: [true, true] })

header: EventHeader { timestamp: 1704443769, event_type: 30, server_id: 1, event_length: 71, next_event_position: 643, event_flags: 0 }
data: WriteRows(WriteRowsEvent { table_id: 12832, included_columns: [true, true], rows: [RowEvent { column_values: [Long(1), Long(1)] }, RowEvent { column_values: [Long(2), Long(2)] }, RowEvent { column_values: [Long(3), Long(3)] }, RowEvent { column_values: [Long(4), Long(4)] }] })

header: EventHeader { timestamp: 1704443769, event_type: 19, server_id: 1, event_length: 54, next_event_position: 697, event_flags: 0 }
data: TableMap(TableMapEvent { table_id: 12832, database_name: "test_db", table_name: "test_tb", column_types: [3, 3], column_metas: [0, 0], null_bits: [true, true] })

header: EventHeader { timestamp: 1704443769, event_type: 31, server_id: 1, event_length: 72, next_event_position: 769, event_flags: 0 }
data: UpdateRows(UpdateRowsEvent { table_id: 12832, included_columns_before: [true, true], included_columns_after: [true, true], rows: [(RowEvent { column_values: [Long(1), Long(1)] }, RowEvent { column_values: [Long(1), Long(3)] }), (RowEvent { column_values: [Long(2), Long(2)] }, RowEvent { column_values: [Long(2), Long(3)] })] })

header: EventHeader { timestamp: 1704443769, event_type: 19, server_id: 1, event_length: 54, next_event_position: 823, event_flags: 0 }
data: TableMap(TableMapEvent { table_id: 12832, database_name: "test_db", table_name: "test_tb", column_types: [3, 3], column_metas: [0, 0], null_bits: [true, true] })

header: EventHeader { timestamp: 1704443769, event_type: 32, server_id: 1, event_length: 53, next_event_position: 876, event_flags: 0 }
data: DeleteRows(DeleteRowsEvent { table_id: 12832, included_columns: [true, true], rows: [RowEvent { column_values: [Long(1), Long(3)] }, RowEvent { column_values: [Long(2), Long(3)] }] })

header: EventHeader { timestamp: 1704443769, event_type: 16, server_id: 1, event_length: 31, next_event_position: 907, event_flags: 0 }
data: Xid(XidEvent { xid: 13739 })

header: EventHeader { timestamp: 1704443769, event_type: 33, server_id: 1, event_length: 65, next_event_position: 972, event_flags: 0 }
data: Gtid(GtidEvent { flags: 1, gtid: "50dc6874-13d3-11ee-a17a-0242ac110002:176030" })

header: EventHeader { timestamp: 1704443769, event_type: 2, server_id: 1, event_length: 92, next_event_position: 1064, event_flags: 0 }
data: Query(QueryEvent { thread_id: 493, exec_time: 0, error_code: 0, schema: "test_db", query: "TRUNCATE TABLE test_tb" })

header: EventHeader { timestamp: 1704443769, event_type: 33, server_id: 1, event_length: 65, next_event_position: 1129, event_flags: 0 }
data: Gtid(GtidEvent { flags: 1, gtid: "50dc6874-13d3-11ee-a17a-0242ac110002:176031" })

header: EventHeader { timestamp: 1704443769, event_type: 2, server_id: 1, event_length: 126, next_event_position: 1255, event_flags: 4 }
data: Query(QueryEvent { thread_id: 493, exec_time: 0, error_code: 0, schema: "test_db", query: "DROP TABLE `test_tb` /* generated by server */" })

Example 2: parse binlogs with binlog-transaction-compression enabled

• execute sqls

flush logs;

SET autocommit=0; 
CREATE DATABASE test_db;
USE test_db;
CREATE TABLE test_tb(id INT, value INT);
INSERT INTO test_tb VALUES(1,1),(2,2),(3,3),(4,4);
UPDATE test_tb SET value=3 WHERE id in(1,2);
DELETE FROM test_tb WHERE id in (1,2);
TRUNCATE TABLE test_tb;
DROP TABLE test_tb;
commit;

• show binlog events

mysql> show binary logs;
+------------------+-----------+-----------+
| Log_name         | File_size | Encrypted |
+------------------+-----------+-----------+
| mysql-bin.000033 |      1429 | No        |

mysql> show binlog events in 'mysql-bin.000033';
+------------------+------+---------------------+-----------+-------------+----------------------------------------------------------------------------+
| Log_name         | Pos  | Event_type          | Server_id | End_log_pos | Info                                                                       |
+------------------+------+---------------------+-----------+-------------+----------------------------------------------------------------------------+
| mysql-bin.000033 |    4 | Format_desc         |         1 |         126 | Server ver: 8.0.31, Binlog ver: 4                                          |
| mysql-bin.000033 |  126 | Previous_gtids      |         1 |         197 | 36682cf3-a048-11ed-b4b3-0242ac110004:1-125753                              |
| mysql-bin.000033 |  197 | Gtid                |         1 |         274 | SET @@SESSION.GTID_NEXT= '36682cf3-a048-11ed-b4b3-0242ac110004:125754'     |
| mysql-bin.000033 |  274 | Query               |         1 |         391 | CREATE DATABASE test_db /* xid=5 */                                        |
| mysql-bin.000033 |  391 | Gtid                |         1 |         468 | SET @@SESSION.GTID_NEXT= '36682cf3-a048-11ed-b4b3-0242ac110004:125755'     |
| mysql-bin.000033 |  468 | Query               |         1 |         601 | use `test_db`; CREATE TABLE test_tb(id INT, value INT) /* xid=10 */        |
| mysql-bin.000033 |  601 | Gtid                |         1 |         680 | SET @@SESSION.GTID_NEXT= '36682cf3-a048-11ed-b4b3-0242ac110004:125756'     |
| mysql-bin.000033 |  680 | Transaction_payload |         1 |        1033 | compression='ZSTD', decompressed_size=633 bytes                            |
| mysql-bin.000033 | 1033 | Query               |         1 |        1033 | BEGIN                                                                      |
| mysql-bin.000033 | 1033 | Rows_query          |         1 |        1033 | # INSERT INTO test_tb VALUES(1,1),(2,2),(3,3),(4,4)                        |
| mysql-bin.000033 | 1033 | Table_map           |         1 |        1033 | table_id: 90 (test_db.test_tb)                                             |
| mysql-bin.000033 | 1033 | Write_rows          |         1 |        1033 | table_id: 90 flags: STMT_END_F                                             |
| mysql-bin.000033 | 1033 | Rows_query          |         1 |        1033 | # UPDATE test_tb SET value=3 WHERE id in(1,2)                              |
| mysql-bin.000033 | 1033 | Table_map           |         1 |        1033 | table_id: 90 (test_db.test_tb)                                             |
| mysql-bin.000033 | 1033 | Update_rows         |         1 |        1033 | table_id: 90 flags: STMT_END_F                                             |
| mysql-bin.000033 | 1033 | Rows_query          |         1 |        1033 | # DELETE FROM test_tb WHERE id in (1,2)                                    |
| mysql-bin.000033 | 1033 | Table_map           |         1 |        1033 | table_id: 90 (test_db.test_tb)                                             |
| mysql-bin.000033 | 1033 | Delete_rows         |         1 |        1033 | table_id: 90 flags: STMT_END_F                                             |
| mysql-bin.000033 | 1033 | Xid                 |         1 |        1033 | COMMIT /* xid=11 */                                                        |
| mysql-bin.000033 | 1033 | Gtid                |         1 |        1110 | SET @@SESSION.GTID_NEXT= '36682cf3-a048-11ed-b4b3-0242ac110004:125757'     |
| mysql-bin.000033 | 1110 | Query               |         1 |        1214 | use `test_db`; TRUNCATE TABLE test_tb /* xid=14 */                         |
| mysql-bin.000033 | 1214 | Gtid                |         1 |        1291 | SET @@SESSION.GTID_NEXT= '36682cf3-a048-11ed-b4b3-0242ac110004:125758'     |
| mysql-bin.000033 | 1291 | Query               |         1 |        1429 | use `test_db`; DROP TABLE `test_tb` /* generated by server */ /* xid=15 */ |
+------------------+------+---------------------+-----------+-------------+----------------------------------------------------------------------------+

• binlogs parsed

header: EventHeader { timestamp: 1704445709, event_type: 15, server_id: 1, event_length: 122, next_event_position: 126, event_flags: 0 }
data: FormatDescription(FormatDescriptionEvent { binlog_version: 4, server_version: "8.0.31\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0", create_timestamp: 0, header_length: 19, checksum_type: CRC32 })

header: EventHeader { timestamp: 1704445709, event_type: 35, server_id: 1, event_length: 71, next_event_position: 197, event_flags: 128 }
data: PreviousGtids(PreviousGtidsEvent { gtid_set: "36682cf3-a048-11ed-b4b3-0242ac110004:1-125753" })

header: EventHeader { timestamp: 1704445716, event_type: 33, server_id: 1, event_length: 77, next_event_position: 274, event_flags: 0 }
data: Gtid(GtidEvent { flags: 1, gtid: "36682cf3-a048-11ed-b4b3-0242ac110004:125754" })

header: EventHeader { timestamp: 1704445716, event_type: 2, server_id: 1, event_length: 117, next_event_position: 391, event_flags: 8 }
data: Query(QueryEvent { thread_id: 8, exec_time: 0, error_code: 0, schema: "test_db", query: "CREATE DATABASE test_db" })

header: EventHeader { timestamp: 1704445716, event_type: 33, server_id: 1, event_length: 77, next_event_position: 468, event_flags: 0 }
data: Gtid(GtidEvent { flags: 1, gtid: "36682cf3-a048-11ed-b4b3-0242ac110004:125755" })

header: EventHeader { timestamp: 1704445716, event_type: 2, server_id: 1, event_length: 133, next_event_position: 601, event_flags: 0 }
data: Query(QueryEvent { thread_id: 8, exec_time: 0, error_code: 0, schema: "test_db", query: "CREATE TABLE test_tb(id INT, value INT)" })

header: EventHeader { timestamp: 1704445717, event_type: 33, server_id: 1, event_length: 79, next_event_position: 680, event_flags: 0 }
data: Gtid(GtidEvent { flags: 0, gtid: "36682cf3-a048-11ed-b4b3-0242ac110004:125756" })

header: EventHeader { timestamp: 1704445717, event_type: 40, server_id: 1, event_length: 353, next_event_position: 1033, event_flags: 0 }
data: TransactionPayload(TransactionPayloadEvent { uncompressed_size: 633, uncompressed_events: [(EventHeader { timestamp: 1704445716, event_type: 2, server_id: 1, event_length: 74, next_event_position: 0, event_flags: 8 }, Query(QueryEvent { thread_id: 8, exec_time: 1, error_code: 0, schema: "test_db", query: "BEGIN" })), (EventHeader { timestamp: 1704445716, event_type: 29, server_id: 1, event_length: 69, next_event_position: 0, event_flags: 128 }, RowsQuery(RowsQueryEvent { query: "INSERT INTO test_tb VALUES(1,1),(2,2),(3,3),(4,4)" })), (EventHeader { timestamp: 1704445716, event_type: 19, server_id: 1, event_length: 53, next_event_position: 0, event_flags: 0 }, TableMap(TableMapEvent { table_id: 90, database_name: "test_db", table_name: "test_tb", column_types: [3, 3], column_metas: [0, 0], null_bits: [true, true] })), (EventHeader { timestamp: 1704445716, event_type: 30, server_id: 1, event_length: 67, next_event_position: 0, event_flags: 0 }, WriteRows(WriteRowsEvent { table_id: 90, included_columns: [true, true], rows: [RowEvent { column_values: [Long(1), Long(1)] }, RowEvent { column_values: [Long(2), Long(2)] }, RowEvent { column_values: [Long(3), Long(3)] }, RowEvent { column_values: [Long(4), Long(4)] }] })), (EventHeader { timestamp: 1704445717, event_type: 29, server_id: 1, event_length: 63, next_event_position: 0, event_flags: 128 }, RowsQuery(RowsQueryEvent { query: "UPDATE test_tb SET value=3 WHERE id in(1,2)" })), (EventHeader { timestamp: 1704445717, event_type: 19, server_id: 1, event_length: 53, next_event_position: 0, event_flags: 0 }, TableMap(TableMapEvent { table_id: 90, database_name: "test_db", table_name: "test_tb", column_types: [3, 3], column_metas: [0, 0], null_bits: [true, true] })), (EventHeader { timestamp: 1704445717, event_type: 31, server_id: 1, event_length: 68, next_event_position: 0, event_flags: 0 }, UpdateRows(UpdateRowsEvent { table_id: 90, included_columns_before: [true, true], included_columns_after: [true, true], rows: [(RowEvent { column_values: [Long(1), Long(1)] }, RowEvent { column_values: [Long(1), Long(3)] }), (RowEvent { column_values: [Long(2), Long(2)] }, RowEvent { column_values: [Long(2), Long(3)] })] })), (EventHeader { timestamp: 1704445717, event_type: 29, server_id: 1, event_length: 57, next_event_position: 0, event_flags: 128 }, RowsQuery(RowsQueryEvent { query: "DELETE FROM test_tb WHERE id in (1,2)" })), (EventHeader { timestamp: 1704445717, event_type: 19, server_id: 1, event_length: 53, next_event_position: 0, event_flags: 0 }, TableMap(TableMapEvent { table_id: 90, database_name: "test_db", table_name: "test_tb", column_types: [3, 3], column_metas: [0, 0], null_bits: [true, true] })), (EventHeader { timestamp: 1704445717, event_type: 32, server_id: 1, event_length: 49, next_event_position: 0, event_flags: 0 }, DeleteRows(DeleteRowsEvent { table_id: 90, included_columns: [true, true], rows: [RowEvent { column_values: [Long(1), Long(3)] }, RowEvent { column_values: [Long(2), Long(3)] }] })), (EventHeader { timestamp: 1704445717, event_type: 16, server_id: 1, event_length: 27, next_event_position: 0, event_flags: 0 }, Xid(XidEvent { xid: 11 }))] })

header: EventHeader { timestamp: 1704445717, event_type: 33, server_id: 1, event_length: 77, next_event_position: 1110, event_flags: 0 }
data: Gtid(GtidEvent { flags: 1, gtid: "36682cf3-a048-11ed-b4b3-0242ac110004:125757" })

header: EventHeader { timestamp: 1704445717, event_type: 2, server_id: 1, event_length: 104, next_event_position: 1214, event_flags: 0 }
data: Query(QueryEvent { thread_id: 8, exec_time: 0, error_code: 0, schema: "test_db", query: "TRUNCATE TABLE test_tb" })

header: EventHeader { timestamp: 1704445717, event_type: 33, server_id: 1, event_length: 77, next_event_position: 1291, event_flags: 0 }
data: Gtid(GtidEvent { flags: 1, gtid: "36682cf3-a048-11ed-b4b3-0242ac110004:125758" })

header: EventHeader { timestamp: 1704445717, event_type: 2, server_id: 1, event_length: 138, next_event_position: 1429, event_flags: 4 }
data: Query(QueryEvent { thread_id: 8, exec_time: 0, error_code: 0, schema: "test_db", query: "DROP TABLE `test_tb` /* generated by server */" })

Example 3: parse json column to string

fn parse_json_columns(data: EventData) {
    let parse_row = |row: RowEvent| {
        for column_value in row.column_values {
            if let ColumnValue::Json(bytes) = column_value {
                println!(
                    "json column: {}",
                    JsonBinary::parse_as_string(&bytes).unwrap()
                )
            }
        }
    };

    match data {
        EventData::WriteRows(event) => {
            for row in event.rows {
                parse_row(row)
            }
        }
        EventData::DeleteRows(event) => {
            for row in event.rows {
                parse_row(row)
            }
        }
        EventData::UpdateRows(event) => {
            for (before, after) in event.rows {
                parse_row(before);
                parse_row(after);
            }
        }
        _ => {}
    }
}

• execute sqls

CREATE TABLE test_db_1.json_test(id INT AUTO_INCREMENT, json_col JSON, PRIMARY KEY(id));

SET autocommit=0;
INSERT INTO test_db_1.json_test VALUES (NULL, '{"k.1":1,"k.0":0,"k.-1":-1,"k.true":true,"k.false":false,"k.null":null,"k.string":"string","k.true_false":[true,false],"k.32767":32767,"k.32768":32768,"k.-32768":-32768,"k.-32769":-32769,"k.2147483647":2147483647,"k.2147483648":2147483648,"k.-2147483648":-2147483648,"k.-2147483649":-2147483649,"k.18446744073709551615":18446744073709551615,"k.18446744073709551616":18446744073709551616,"k.3.14":3.14,"k.{}":{},"k.[]":[]}');
INSERT INTO test_db_1.json_test VALUES (NULL, '{"中文":"😀"}');
commit;

• parsed json column values:

json column: {"k.0":0,"k.1":1,"k.-1":-1,"k.[]":[],"k.{}":{},"k.3.14":3.14,"k.null":null,"k.true":true,"k.32767":32767,"k.32768":32768,"k.false":false,"k.-32768":-32768,"k.-32769":-32769,"k.string":"string","k.2147483647":2147483647,"k.2147483648":2147483648,"k.true_false":[true,false],"k.-2147483648":-2147483648,"k.-2147483649":-2147483649,"k.18446744073709551615":18446744073709551615,"k.18446744073709551616":18446744073709552000}

json column: {"中文":"😀"}

Example 4: parse binlog file

async fn parse_file() {
    let file_path = "path-to-binlog-file";
    let mut file = File::open(file_path).unwrap();

    let mut parser = BinlogParser {
        checksum_length: 4,
        table_map_event_by_table_id: HashMap::new(),
    };

    assert!(parser.check_magic(&mut file).is_ok());
    while let Ok((header, data)) = parser.next(&mut file) {
        println!("header: {:?}", header);
        println!("data: {:?}", data);
        println!("");
    }
}