subprocess

BETA

This component is mostly stable but breaking changes could still be made outside of major version releases if a fundamental problem with the component is found.

Executes a command, runs it as a subprocess, and consumes messages from it over stdout.

Common

# Common config fields, showing default values
input:
  label: ""
  subprocess:
    name: cat # No default (required)
    args: []
    codec: lines
    restart_on_exit: false

Advanced

# All config fields, showing default values
input:
  label: ""
  subprocess:
    name: cat # No default (required)
    args: []
    codec: lines
    restart_on_exit: false
    max_buffer: 65536

Messages are consumed according to a specified codec. The command is executed once and if it terminates the input also closes down gracefully. Alternatively, the field restart_on_close can be set to true in order to have Benthos re-execute the command each time it stops.

The field max_buffer defines the maximum message size able to be read from the subprocess. This value should be set significantly above the real expected maximum message size.

The execution environment of the subprocess is the same as the Benthos instance, including environment variables and the current working directory.

Fields

name

The command to execute as a subprocess.

Type: string

# Examples

name: cat

name: sed

name: awk

args

A list of arguments to provide the command.

Type: array
Default: []

codec

The way in which messages should be consumed from the subprocess.

Type: string
Default: "lines"
Options: lines.

restart_on_exit

Whether the command should be re-executed each time the subprocess ends.

Type: bool
Default: false

max_buffer

The maximum expected size of an individual message.

Type: int
Default: 65536