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# Fluent Bit / filter_wasm_go
This source source tree provides an example of WASM filter program with WASI mode.
## Prerequisites
Tested on
* TinyGo
* [tinygo](https://tinygo.org/) tinygo version 0.23.0 linux/amd64 (using go version go1.18.2 and LLVM version 14.0.0)
* [tinygo](https://tinygo.org/) tinygo version 0.24.0 linux/amd64 (using go version go1.18.2 and LLVM version 14.0.0)
For Ubuntu, it's easy to install with:
```console
$ wget https://github.com/tinygo-org/tinygo/releases/download/v0.24.0/tinygo_0.24.0_amd64.deb
$ sudo dpkg -i tinygo_0.24.0_amd64.deb
```
## How to build
Execute _tinygo build_ as follows:
```console
$ tinygo build -wasm-abi=generic -target=wasi -o filter.wasm filter.go
```
Finally, under the same directory, `*.wasm` file will be created:
```console
$ ls *.wasm
filter.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.wasm
Function_Name go_filter
accessible_paths .,/path/to/fluent-bit
[OUTPUT]
Name stdout
Match *
```
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