# Exec Wasi

The **exec\_wasi** input plugin, allows to execute WASM program that is WASI target like as external program and collects event logs from there.

## Configuration Parameters

The plugin supports the following configuration parameters:

| Key               | Description                                                                                                           |
| ----------------- | --------------------------------------------------------------------------------------------------------------------- |
| WASI\_Path        | The place of a WASM program file.                                                                                     |
| Parser            | Specify the name of a parser to interpret the entry as a structured message.                                          |
| Accessible\_Paths | Specify the whilelist of paths to be able to access paths from WASM programs.                                         |
| Interval\_Sec     | Polling interval (seconds).                                                                                           |
| Interval\_NSec    | Polling interval (nanosecond).                                                                                        |
| Buf\_Size         | Size of the buffer (check [unit sizes](https://docs.fluentbit.io/manual/configuration/unit_sizes) for allowed values) |
| Oneshot           | Only run once at startup. This allows collection of data precedent to fluent-bit's startup (bool, default: false)     |

## Configuration Examples

Here is a configuration example. in\_exec\_wasi can handle parser. To retrieve from structured data from WASM program, you have to create parser.conf:

Note that `Time_Format` should be aligned for the format of your using timestamp. In this documents, we assume that WASM program should write JSON style strings into stdout.

```python
[PARSER]
    Name        wasi
    Format      json
    Time_Key    time
    Time_Format %Y-%m-%dT%H:%M:%S.%L %z
```

Then, you can specify the above parsers.conf in the main fluent-bit configuration:

```python
[SERVICE]
    Flush        1
    Daemon       Off
    Parsers_File parsers.conf
    Log_Level    info
    HTTP_Server  Off
    HTTP_Listen  0.0.0.0
    HTTP_Port    2020

[INPUT]
    Name exec_wasi
    Tag  exec.wasi.local
    WASI_Path /path/to/wasi/program.wasm
    Accessible_Paths .,/path/to/accessible
    Parser wasi

[OUTPUT]
    Name  stdout
    Match *

```


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.fluentbit.io/manual/2.1/pipeline/inputs/exec-wasi.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.