Support overriding properties from flags or environment variables

[l-lin]

Which version are you using?

v0.10.0

Which operating system are you using?

Linux

Enhancement request

It seems there was a time when the rtsp-simple-server could be configured via flags (for example in the #17 comment). However it's now only configurable from a yaml file (from this improvement).

I was wondering if you plan to (re-)support overriding the properties from another source than the configuration file (e.g. flags, environment variables, ...)? What do you think about https://github.com/spf13/viper?

---

My use case is that I want to spawn dynamically X rtsp-simple-servers in a single server.
For example, if I want to spawn 100 rtsp-simple-services, I could do something like:

#!/usr/bin/env bash

set -e

for i in {0..100}; do
  rtsp_port=$(expr $i + 10000)
  rtp_port=$(expr $i + 8000)
  rtcp_port=$(expr $i + 9000)
  rtsp-simple-servers --rtsp-port="${rtsp_port}" --rtp-port="${rtp_port}" --rtcp-port="${rtcp_port}"
done

But I can't imagine creating 100 rtsp-simple-server.yml files. It's not quite scalable.

Note: I can always mitigate my issue by creating 100 docker containers by mapping the default ports 8554, 8000 and 8001 to the host desired ports.

[aler9]

Hello, i use Grafana a lot, and it's configurable in a way similar to the one proposed by Viper; there's a configuration file, and at the same time config values can be overridden with environment variables.
So yes, i think it can be implemented.

[aler9]

feature added in v0.10.1

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