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# Fluent Bit / filter_rust
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)
## How to build
Add `wasm32-unknown-unknown` target for Rust toolchain:
```console
$ rustup target add wasm32-unknown-unknown
```
Then, execute _cargo build_ as follows:
```console
$ cargo build --target wasm32-unknown-unknown --release
```
Finally, `*.wasm` file will be created:
```console
$ ls target/wasm32-unknown-unknown/release/*.wasm
target/wasm32-unknown-unknown/release/filter_rust.wasm
```
## How to confirm WASM filter 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/filter_rust.wasm
Function_Name rust_filter
accessible_paths .,/path/to/fluent-bit
[OUTPUT]
Name stdout
Match *
```
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