[FEATURE REQUEST] Run scripts in the server's command

[rustatian]

Discussed in https://github.com/spiral/roadrunner/discussions/796

^{Originally posted by **rustatian** September 13, 2021} Hey, RR community. I want to ask you about one feature. How likely do you guys need to have the ability to execute scripts in the `server` plugin, like this: Script sample: ```bash #!/usr/bin/env bash setenv, generate config, etc etc etc php ../roadrunner/tests/jobs_ok.php <- run PHP or bin ``` `rr.yaml` sample: ```yaml server: command: "./start.sh" <-- script relay: "pipes" relay_timeout: "20s" ``` At the moment we have a limitation around such configuration because we check for the process PID and worker's PID to properly attach relay and they are mismatches. However, for such configuration, the child process will inherit process descriptors from the parent and we may safely send data to the script fd without checking the worker's FD.

[OO00O0O]

I use RR as entrypoint in docker so I really would love to have some way of moving "boot" script to it. I need to warmup symfony, check some services etc. And only when worker is waiting for request and is actually ready I send requests to it. I have hard dependency for docker health check.

My usual config looks like: server: "php --ini /service/docker/php.ini /service/server". server is entry point for rr and console applications. Depends on RR_MODE and php_sapi_name().

Edit: maybe some trigger system would do the thing. Examples: onBoot: "php boot.php" should be called once on rr start - if return 0, continue. Could be any application.

[rustatian]

Hey @OO00O0O . Thanks for your feedback. on_boot feature looks natural to me. This is a good proposal. Could you please describe your on_boot case in a separate ticket and I'll discuss this with our PHP team?

[OO00O0O]

spiral/roadrunner-plugins#57 - done.

Back on topic: if RR can accept any script, then it makes no difference who communicates with it. I mean RR could run ANY worker in ANY language that can work with protobuf and/or json(for fallback).

[rauanmayemir]

Tbh, this feels like a stretch.

You're much better off with something like s6-overlay to deal with the OS level init, letting RR focus strictly on your business domain.

Edit: s/business domain/app domain/.

[rustatian]

@rauanmayemir I don't think, that I correctly understand you. The main purpose of this feature is to allow running scripts. You may run any preparation in it, not only s6-overlay or leave a PHP command inside, doesn't matter 😃