WASM Input Plugins
Calyptia Fluent Bit currently supports integration of wasm plugins built as wasm/wasi objects for input and filter plugins only. The interface for the WASM filter plugins is currently under development but is functional.
Currently, Calyptia Fluent Bit supports the following WASM toolchains:
Currently, Calyptia Fluent Bit's WASM input assumes WASI ABI that is also known as
wasm32-wasion Rust target and
wasm32-wasion TinyGo target.
$ rustup target add wasm32-wasi
WASM input plugins execute the function that has wasi main function entrypoint. And Calyptia Fluent Bit's WASM input plugin communicates via stdout on WASM programs.
WASM programs should handle stdout for ingesting logs into Calyptia Fluent Bit.
Once built, a WASM/WASI program will be available. Then, that built program can be executed with the following Calyptia Fluent Bit configuration:
# For security reasons, WASM/WASI program cannot access its outer world
# without accessible permissions.
# accessible_paths .,/path/to/calyptia-fluent-bit
For further example that handles structured logs, calyptia-fluent-bit has a Rust serde-json example: https://github.com/fluent/fluent-bit/tree/master/examples/wasi_serde_json