WeScale-Wasm-Plugin-Template

Pre-requisites

• You need to have TinyGo to compile the code, you can install it by following the instructions here.

• You will also need to have the wescale_wasm binary to deploy the plugin, you can download it by running the following command.

make install-wescale-wasm

Write your code

You can write your code in the main.go file. You can use the following template to write your code. You can see the example code in the examples directory.

Build

You can build the wasm binary by running the following command. You can specify the wasm file name by using the WASM_FILE variable. You can see the wasm binary in the bin directory.

make build WASM_FILE=my_plugin.wasm

If you want to build the example plugin, you can run the following command.

make build-examples

Deploy

How to deploy a wasm binary to WeScale to be a Filter:

1. You need to use the make build command to build the wasm binary (if it's not already built).
2. You need to use the make install-wescale-wasm command to download the wescale_wasm binary (if it's not already downloaded).
3. You need to use the wescale_wasm binary to install the plugin.
   • It will copy the wasm binary to the WeScale cluster. You can see the wasm binary in the mysql.wasm_binary system table.
   • It will create a new filter and attach the wasm binary to it. You can see the filter using the SHOW FILTERS command.

You can specify detailed arguments for the wescale_wasm binary to install the plugin.

# To see all the available arguments
./bin/wescale_wasm -h

# To specify the mysql arguments
./bin/wescale_wasm --command=install --wasm_file=./bin/my_plugin.wasm --mysql_host=127.0.0.1 --mysql_port=15306 --mysql_user=root --mysql_password=root --create_filter 

# To specify the filter arguments
./bin/wescale_wasm --command=install --wasm_file=./bin/my_plugin.wasm --create_filter --filter_name=my_plugin_wasm_filter --filter_desc='some kind of description' --filter_status=INACTIVE

UnDeploy

How to undeploy a wasm binary:

1. You need to use the wescale_wasm binary to uninstall the plugin.
   • It will delete the wasm binary from the WeScale cluster. You can see the wasm binary in the mysql.wasm_binary system table.
   • It will delete the filter and detach the wasm binary from it. You can see the filter using the SHOW FILTERS command.

./bin/wescale_wasm --command=uninstall --filter_name=my_plugin_wasm_filter