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# Fluent Bit / filter_rust_clib
This source source tree provides an example of WASM program with WASI mode mainly written in Rust.
## Prerequisites
* Rust
* rustc 1.61.0 (fe5b13d68 2022-05-18)
* [rustup](https://rustup.rs/) (For preparing rust compiler and toolchains)
* [cbindgen](https://github.com/eqrion/cbindgen) (For preparing C headers to include exported Rust's c style function(s))
* [WASI SDK](https://github.com/WebAssembly/wasi-sdk)
For Ubuntu, it's easy to install with:
```console
$ export WASI_VERSION=14
$ export WASI_VERSION_FULL=${WASI_VERSION}.0
$ wget https://github.com/WebAssembly/wasi-sdk/releases/download/wasi-sdk-${WASI_VERSION}/wasi-sdk-${WASI_VERSION_FULL}-linux.tar.gz
$ sudo mkdir -p /opt/wasi-sdk/
$ sudo tar xvf wasi-sdk-${WASI_VERSION_FULL}-linux.tar.gz --strip-components=1 -C /opt/wasi-sdk
```
## How to build
Add `wasm32-unknown-unknown` target for Rust toolchain:
```console
$ rustup target add wasm32-unknown-unknown
```
Install `cbindgen` command as follows:
```console
$ cargo install --force cbindgen
```
Then, execute _make build_ as follows:
```console
$ make build
```
Finally, `*.wasm` file will be created:
```console
$ ls *.wasm
rust_clib_filter.wasm
```
## How to confirm WASI integration
Create fluent-bit configuration file as follows:
```ini
[SERVICE]
Flush 1
Daemon Off
Log_Level info
HTTP_Server Off
HTTP_Listen 0.0.0.0
HTTP_Port 2020
[INPUT]
Name dummy
Tag dummy.local
[FILTER]
Name wasm
match dummy.*
WASM_Path /path/to/rust_clib_filter.wasm
Function_Name rust_clib_filter
accessible_paths .,/path/to/fluent-bit
[OUTPUT]
Name stdout
Match *
```
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