Myprotosql

A set of mysql stored functions/procedures to read protobuf binary data

Getting started (with *.proto files)

See decode using .proto files for an example.

• Download and install protoc

• Install myprotosql (requires python):

  pip install myprotosql

• Run protoc with the myprotosql plugin (your *.proto files located in ./proto, output in ./build):

  protoc  --proto_path=proto --myprotosql_out=build ./proto/*

• Run the generated install_myproto.sql and myproto_descriptors.sql scripts in MySQL
  If you used this proto file, you can now decode your first protobuf message

  select myproto_decode_to_textformat(
      0x1a03089601, 'foo.bar.ParentMessage', myproto_descriptors());

Getting started (without *.proto files)

This is similar to protoc --decode_raw. See decode raw for an example.

• Install myprotosql (requires python):

  pip install myprotosql

• Generate the install script

  myprotosql-install-script > install_myproto.sql

• Run the generated install_myproto.sql script in MySQL
  Decode your first protobuf message:

  select myproto_decode_to_textformat(0x1a03089601, null, null);

Alternative

Instead of using pip and python to install myprotosql, you can also just download the install_myproto.sql from the github repository and run that in MySQL.

Decoding

Running install_myproto.sql installs two functions that can be used to decode protobuf binary messages:

• myproto_decode_to_textformat(binary_message, message_type, type_descriptors)
• myproto_decode_to_jsonformat(binary_message, message_type, type_descriptors)

Decode raw

Decoding without the *.proto files

Textformat

decode_raw the 0x1a03089601 binary data to textformat:

select myproto_decode_to_textformat(0x1a03089601, null, null);

Returns:

3: {
 1: 150
}

JSON

select myproto_decode_to_jsonformat(0x1a03089601, null, null);

Returns:

{"3": {"1": 150}}

Decode using .proto files

Let's say we have a .proto file like this:

package foo.bar;

message SubMessage {
  optional int32 a = 1;
}

message ParentMessage {
  optional SubMessage c = 3;
}

Check out Getting started (with *.proto files) to compile these *.proto files in something MySQL can understand.

Textformat

For example to decode the 0x1a03089601 binary data to textformat:

select myproto_decode_to_textformat(0x1a03089601, 'foo.bar.ParentMessage', myproto_descriptors());

Returns:

c: {
 a: 150
}

JSON

select myproto_decode_to_jsonformat(0x1a03089601, 'foo.bar.ParentMessage', myproto_descriptors());

Returns:

{"c": {"a": 150}}

Troubleshooting

on Windows if you used Virtualenv

you need to specify the full path to the myprotosql plugin, like this:

protoc.exe  --proto_path=proto --myprotosql_out=build --plugin=protoc-gen-myprotosql=.\venv\Scripts\protoc-gen-myprotosql.exe .\proto\* 

This assumed your proto files are located in .\proto and your virtual env path is .\venv. In general the command is of the form:

protoc  --proto_path=<the-path-to-your-proto-files> --myprotosql_out=<the-output-path> --plugin=protoc-gen-myprotosql=<the-path-to-the-myprotosql-plugin> <the-path-to-your-proto-files>\*

Limitations of decode_raw

Decode raw has limitations because protobuf binary data does not contain all info to properly decode the data.

• output will not contain field names, only field numbers
• packed repeated scalar values will be decoded as one binary string
• numbers will be decoded as unsigned integers

If you need proper decoding, then read on and learn how to use information in your *.proto files

Uninstalling

• Generate the uninstall script

  myprotosql-uninstall-script > uninstall_myproto.sql

• Run the generated uninstall_myproto.sql script in MySQL

Alternative

Download the uninstall_myproto.sql from the github repository and run that in MySQL.

Todo

• todos in code