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mysql-binlog-connector-rust

概览

使用异步 IO 拉取并解析 mysql binlog（binlog_format=ROW）

支持的 mysql 版本

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)

支持的复制模式

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

支持的事件类型

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
更多细节, 参考: mysql doc

mysql 数据类型和 rust 数据类型映射

mysql column type	binlog column type(raw)	binlog column type(parsed from binlog column meta)	rust type
BIT	MYSQL_TYPE_BIT = 16	ColumnType::Bit	ColumnValue::Bit(u64)
TINYINT [UNSIGNED]	MYSQL_TYPE_TINY = 1	ColumnType::Tiny	ColumnValue::Tiny(i8)
SMALLINT [UNSIGNED]	MYSQL_TYPE_SHORT = 2	ColumnType::Short	ColumnValue::Short(i16)
MEDIUMINT [UNSIGNED]	MYSQL_TYPE_INT24 = 9	ColumnType::Int24	ColumnValue::Long(i32)
INT [UNSIGNED]	MYSQL_TYPE_LONG = 3	ColumnType::Long	ColumnValue::Long(i32)
BIGINT [UNSIGNED]	MYSQL_TYPE_LONGLONG = 8	ColumnType::LongLong	ColumnValue::LongLong(i64)
FLOAT	MYSQL_TYPE_FLOAT = 4	ColumnType::Float	ColumnValue::Float(f32)
DOUBLE	MYSQL_TYPE_DOUBLE = 5	ColumnType::Double	ColumnValue::Double(f64)
DECIMAL	MYSQL_TYPE_NEWDECIMAL = 246	ColumnType::NewDecimal	ColumnValue::Decimal(String)
DATE	MYSQL_TYPE_DATE = 10	ColumnType::Date	ColumnValue::Date(String)
TIME	MYSQL_TYPE_TIME2 = 19	ColumnType::Time2	ColumnValue::Time(String)
TIMESTAMP	MYSQL_TYPE_TIMESTAMP2 = 17	ColumnType::TimeStamp2	ColumnValue::Timestamp(i64)
DATETIME	MYSQL_TYPE_DATETIME2 = 18	ColumnType::DateTime2	ColumnValue::DateTime(String)
YEAR	MYSQL_TYPE_YEAR = 13	ColumnType::Year	ColumnValue::Year(u16)
CHAR	MYSQL_TYPE_STRING = 254	ColumnType::String	ColumnValue::String(Vec<u8>)
VARCHAR	MYSQL_TYPE_VARCHAR = 15	ColumnType::VarChar	ColumnValue::String(Vec<u8>)
BINARY	MYSQL_TYPE_STRING = 254	ColumnType::String	ColumnValue::String(Vec<u8>)
VARBINARY	MYSQL_TYPE_VARCHAR = 15	ColumnType::VarChar	ColumnValue::String(Vec<u8>)
ENUM	MYSQL_TYPE_STRING = 254	ColumnType::Enum	ColumnValue::Enum(u32)
SET	MYSQL_TYPE_STRING = 254	ColumnType::Set	ColumnValue::Set(u64)
TINYTEXT TEXT MEDIUMTEXT LONGTEXT TINYBLOB BLOB MEDIUMBLOB LONGBLOB	MYSQL_TYPE_BLOB = 252	ColumnType::Blob	ColumnValue::Blob(Vec<u8>)
GEOMETRY	MYSQL_TYPE_GEOMETRY = 255	ColumnType::Geometry	ColumnValue::Blob(Vec<u8>)
JSON	MYSQL_TYPE_JSON = 245	ColumnType::Json	ColumnValue::Json(Vec<u8>)

对于 CHAR / VARCHAR 列，由于 binlog 不包含字符集信息，我们只获取二进制数据并存储在 ColumnValue::String(Vec<u8>) 对象中，用户需根据列的元数据进行转换。
对于 UNSIGNED 数字列，由于 binlog 不包含符号标志，我们只将其解析为有符号数字，用户需根据列的元数据进行转换。
对于 JSON 列，我们只获取二进制数据并将其存储在 ColumnValue::Json(Vec<u8>) 对象中，同时我们还提供一个的默认解析器 JsonBinary 将其解析为字符串，本文后续有相应示例。

快速开始

运行测试用例

docker 启动 mysql 5.7，开启 binlog，关闭 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

docker 启动 mysql 8.0，开启 binlog，打开 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"

更新 tests/.env 中的配置

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

运行测试

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

每个测试用例会：
执行 sql 并生成 binlog
获取 binlog 并解析
等待 binlog_parse_millis 以将所有 binlog 解析完毕
对于大事务，可能需要增大 binlog_parse_millis

用例

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!();
    }
}

用例 1: 解析关闭 binlog-transaction-compression 的事务

执行 sql

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;

查看 binlog 事件

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 */          |
+------------------+------+----------------+-----------+-------------+------------------------------------------------------------------------+

解析出的 binlog

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 */" })

用例 2: 解析开启 binlog-transaction-compression 的 binlog

执行 sql

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;

查看 binlog 事件

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 */ |
+------------------+------+---------------------+-----------+-------------+----------------------------------------------------------------------------+

解析出的 binlog

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 */" })

用例 3: 将 json 字段解析成 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);
            }
        }
        _ => {}
    }
}

执行 sql

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;

解析出的 json 字段

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":"😀"}

用例 4: 解析 binlog 文件

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!("");
    }
}

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