rewrite most code; removes database to solely rely on config file

config.go

@@ -0,0 +1,48 @@
+package main
+
+import (
+	"fmt"
+	"github.com/pelletier/go-toml"
+	"os"
+)
+
+type Config struct {
+	ServerPort uint16     `toml:"port"`
+	RRConfigs  []RRConfig `toml:"rrconfig"`
+
+	rrconfigs map[string]*RRConfig
+}
+
+type RRConfig struct {
+	Username   string `toml:"username"`
+	Password   string `toml:"password"`
+	Nameserver string `toml:"nameserver"`
+	Zonename   string `toml:"zonename"`
+	Hostname   string `toml:"hostname"`
+	Tsigkey    string `toml:"tsigkey"`
+	Ttl        int    `toml:"ttl" default:"60"`
+}
+
+func LoadConfig(path string) (*Config, error) {
+	var cfg Config
+
+	f, err := os.Open(path)
+	if err != nil {
+		return nil, err
+	}
+
+	decoder := toml.NewDecoder(f).Strict(true)
+	err = decoder.Decode(&cfg)
+	if err != nil {
+		return nil, err
+	}
+
+	cfg.rrconfigs = map[string]*RRConfig{}
+	for _, entry := range cfg.RRConfigs {
+		if _, ok := cfg.rrconfigs[entry.Username]; ok {
+			return nil, fmt.Errorf("Duplicate username detected")
+		}
+		cfg.rrconfigs[entry.Username] = &entry
+	}
+	return &cfg, nil
+}