check_environment.go

package env

import (
	"errors"
	"log/slog"
	"os"
)

// checkEnvironment checks if environment variables are present
func checkEnvironment(vars ...string) (errs []error) {
	// iterate over necessary os vars
	for _, v := range vars {
		if len(os.Getenv(v)) == 0 {
			msg := "Environment variable " + v + " is not present."
			errs = append(errs, errors.New(msg))
		}
	}
	return
}

// CheckRequiredEnvironmentVariables checks if environment variables are present
// panics if one is missing
func CheckRequiredEnvironmentVariables(requiredEnvironmentVariables ...string) {
	errs := checkEnvironment(requiredEnvironmentVariables...)
	// if necessary env variable: panic
	if len(errs) != 0 {
		for _, e := range errs {
			slog.With("err", e).Error("environment variable is missing. Please add the variable to startup the system")
		}
		panic("Missing required environment variables")
	}
	return
}

// CheckOptionalEnvironmentVariables checks if
func CheckOptionalEnvironmentVariables(possibleEnvironmentVariables ...string) {
	errs := checkEnvironment(possibleEnvironmentVariables...)
	// if necessary env variable: panic
	if len(errs) != 0 {
		for _, e := range errs {
			slog.With("err", e).Warn("environment variable can be set but is missing")
		}
	}
	return
}