mysql-simpleproxy

For the purpose of learning netty and mysql protocol

This project is in the purpose of learning netty and mysql protocol.

How to use

Run Server.java, and then use the mysql command line tool to login in this proxy just like logining mysql server:

mysql -u${mysql_user} -p${mysql_password} -P8066 -h127.0.0.1

By default, it will route to the default backend mysql server localhost:3306. you can change it in the SystemConfig.java:

private String mysqlHost = "localhost";
private int mysqlPort = 3306;

As soon as login successfully, you can use whatever command like what you use with mysql, becasue it just transfered your command directly into the real mysql server and recevie the server reponse back to you!

In the output console, you can see each mysql protocol packet data like :

# input show database, and get its packet data :

          +-------------------------------------------------+
         |  0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f |
+--------+-------------------------------------------------+----------------+
|00000000| 0f 00 00 00 03 73 68 6f 77 20 64 61 74 61 62 61 |.....show databa|
|00000010| 73 65 73                                        |ses             |
+--------+-------------------------------------------------+----------------+

# then reponse like this:

         +-------------------------------------------------+
         |  0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f |
+--------+-------------------------------------------------+----------------+
|00000000| 01 00 00 01 01 4b 00 00 02 03 64 65 66 12 69 6e |.....K....def.in|
|00000010| 66 6f 72 6d 61 74 69 6f 6e 5f 73 63 68 65 6d 61 |formation_schema|
|00000020| 08 53 43 48 45 4d 41 54 41 08 53 43 48 45 4d 41 |.SCHEMATA.SCHEMA|
|00000030| 54 41 08 44 61 74 61 62 61 73 65 0b 53 43 48 45 |TA.Database.SCHE|
|00000040| 4d 41 5f 4e 41 4d 45 0c 21 00 c0 00 00 00 fd 01 |MA_NAME.!.......|
|00000050| 00 00 00 00 13 00 00 03 12 69 6e 66 6f 72 6d 61 |.........informa|
|00000060| 74 69 6f 6e 5f 73 63 68 65 6d 61 06 00 00 04 05 |tion_schema.....|
|00000070| 6d 79 73 71 6c 13 00 00 05 12 70 65 72 66 6f 72 |mysql.....perfor|
|00000080| 6d 61 6e 63 65 5f 73 63 68 65 6d 61 04 00 00 06 |mance_schema....|
|00000090| 03 73 79 73 08 00 00 07 07 74 65 73 74 64 62 31 |.sys.....testdb1|
|000000a0| 08 00 00 08 07 74 65 73 74 64 62 32 08 00 00 09 |.....testdb2....|
|000000b0| 07 74 65 73 74 64 62 33 08 00 00 0a 07 74 65 73 |.testdb3.....tes|
|000000c0| 74 64 62 34 07 00 00 0b fe 00 00 22 00 00 00    |tdb4......."... |
+--------+-------------------------------------------------+----------------+