Calyptia Core Agent
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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 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.
[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:
[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 *