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# Fluent Bit / filter_wasm_c
This source source tree provides an example of WASM filter program with WASI mode.
## Prerequisites
Tested on
* [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
Execute _make_ as follows:
```console
$ make
/opt/wasi-sdk/bin/clang -O3 -nostdlib \
-z stack-size=8192 -Wl,--initial-memory=65536 \
-o c_filter.wasm c_filter.c \
-Wl,--export=__heap_base -Wl,--export=__data_end -Wl,--export=c_filter \
-Wl,--no-entry -Wl,--strip-all -Wl,--allow-undefined
```
Finally, under the same directory, `*.wasm` file will be created:
```console
$ ls *.wasm
c_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 c_filter.wasm
Function_Name c_filter
accessible_paths .,/path/to/fluent-bit
[OUTPUT]
Name stdout
Match *
```
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