config.go

/*
Gondul GO API
Copyright 2020, Kristian Lyngstøl <kly@kly.no>

This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
*/

package gondulapi

import (
	"encoding/json"
	"io/ioutil"
	"fmt"
	"github.com/gathering/gondulapi/log"
)

// Config covers global configuration, and if need be it will provide
// mechanisms for local overrides (similar to Skogul).
var Config struct {
	ListenAddress    string // Defaults to :8080
	ConnectionString string // For database connections
	Prefix           string // URL prefix, e.g. "/api".
	HTTPUser         string // username for HTTP basic auth
	HTTPPw           string // password for HTTP basic auth
	Debug            bool   // Enables trace-debugging
	Driver		 string // SQL driver, defaults to postgres
}

// ParseConfig reads a file and parses it as JSON, assuming it will be a
// valid configuration file.
func ParseConfig(file string) error {
	dat, err := ioutil.ReadFile(file)
	if err != nil {
		return fmt.Errorf("Failed to read config file: %w", err)
	}
	if err := json.Unmarshal(dat, &Config); err != nil {
		return fmt.Errorf("Failed to parse config file: %w", err)
	}
	log.Debugf("Parsed config file as %v", Config)
	return nil
}