Print Sample Data

The print hook prints processed samples to the standard output or into a file. While doing so, it supports all the formats described here: Format Types . It can also optionally prefix each line of output with a user definable prefix in order to distinguish the output of multiple print hooks.

Implementation

The source code of the hook is available here: https://github.com/VILLASframework/node/blob/master/lib/hooks/print.cpp

Configuration

output	string Default: "/dev/stdout" An optional path to a file to which the samples processed by this hook will be written to.
	Format Object (object) or Format Name (string) (format_spec)
prefix	string Default: "" An optional prefix which will be prepended to each line written by this hook to the output
enabled	boolean Default: true An optional field which can be used to disable a hook.
priority	integer Default: 99 The priority of this hook which determines the order in which hooks are executed. Hooks with a lwoer priority are executed before ones with a higher priority. If no priority is configured, hooks are executed in the order they are configured in the configuration file.

{

• "output": "/dev/stdout",
• "format": "villas.human",
• "prefix": "",
• "enabled": true,
• "priority": 99

}

Example

node/etc/examples/hooks/print.conf

@include "hook-nodes.conf"

paths = (
    {
        in = "signal_node"
        out = "file_node"

        hooks = (
            {
                type = "print"

                output = "print_output_file.log"
                format = "villas.human"
                # prefix = "[file_node] " # Prefix and output are exclusive settings!
            }
        )
    }
)