Using channels

[Ido Rosenzwig]

Hello cockpit-devel,

I have a project, a cockpit plugin - cockpit-ovirt written in ReactJS.
In the project, I need to run a script that will run for a long time
(~20-30 minutes) that will be executed after an event has occurred (let's
say a button click).
This script outputs a stream of data and I would like to get the data in
cockpit and print it to the screen during the time the script is executed.

What is the recommended way to do it using cockpit API ?

I saw the raw channel documentation, but found no examples / usage that I
can use.

Please help,
Ido Rosenzwig

[Stef Walter]

On 06.08.19 13:29, Ido Rosenzwig wrote:
> Hello cockpit-devel,
>
> I have a project, a cockpit plugin - cockpit-ovirt written in ReactJS.
> In the project, I need to run a script that will run for a long time
> (~20-30 minutes) that will be executed after an event has occurred
> (let's say a button click).
> This script outputs a stream of data and I would like to get the data in
> cockpit and print it to the screen during the time the script is executed.
>
> What is the recommended way to do it using cockpit API ?

While you could use channels directly, the cockpit.spawn() API works
well for this:

https://cockpit-project.org/guide/latest/cockpit-spawn.html

Something like this:

process = cockpit.spawn(["/path/to/script"], err: "message");
process.fail(function(ex) {
   /* invoked if script fails */
});
process.stream(function(data) {
   /* invoked  for every block of data script write to stdout */
});

Use this option to include stderr output in the streamed output:

err: "out"

If the script expects input or EOF on stdin, you can send it using:

process.input("data");

or

process.input("");

... respectively. Hope this helps,

Stef
> I saw the raw channel documentation, but found no examples / usage that
> I can use.
>
> Please help,
> Ido Rosenzwig
>
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