Comment on page

Wasm

Use Wasm programs as a filter

Wasm Filter allows you to modify the incoming records using Wasm technology.
Due to the necessity to have a flexible filtering mechanism, it is now possible to extend Fluent Bit capabilities by writing custom filters using built Wasm programs and its runtime. A Wasm-based filter takes two steps:
1.(Optional) Compiled as AOT (Ahead Of Time) objects to optimize Wasm execution pipeline
2.Configure the Filter in the main configuration
3.Prepare a Wasm program that will be used by the Filter
Configuration Parameters
The plugin supports the following configuration parameters:
Key
Description
Wasm_Path
Path to the built Wasm program that will be used. This can be a relative path against the main configuration file.
Function_Name
Wasm function name that will be triggered to do filtering. It's assumed that the function is built inside the Wasm program specified above.
Accessible_Paths
Specify the whilelist of paths to be able to access paths from WASM programs.
Configuration Examples
Here is a configuration example.
[INPUT]
    Name   dummy
    Tag    dummy.local
​
[FILTER]
    Name wasm
    Match dummy.*
    WASM_Path /path/to/wasm_program.wasm
    Function_Name filter_function_name
    Accessible_Paths .,/path/to/accessible
​
[OUTPUT]
    Name   stdout
    Match  *

Key	Description
Wasm_Path	Path to the built Wasm program that will be used. This can be a relative path against the main configuration file.
Function_Name	Wasm function name that will be triggered to do filtering. It's assumed that the function is built inside the Wasm program specified above.
Accessible_Paths	Specify the whilelist of paths to be able to access paths from WASM programs.

Last modified 2mo ago