Initial commit.

config/exported.go

@@ -0,0 +1,66 @@
+package config
+
+import (
+	// stdlib
+	"flag"
+	"io/ioutil"
+	"log"
+	"os/user"
+	"path/filepath"
+	"strings"
+
+	// other
+	"gopkg.in/yaml.v2"
+)
+
+var (
+	configPathRaw string
+	Cfg           *Config
+)
+
+// Initialize initializes package.
+func Initialize() {
+	log.Println("Initializing configuration...")
+
+	flag.StringVar(&configPathRaw, "conf", "", "Path to configuration file, should be absolute.")
+}
+
+// Load loads configuration into memory and parses it into Config struct.
+func Load() {
+	if configPathRaw == "" {
+		log.Fatalln("No configuration file path defined! See '-h'!")
+	}
+
+	log.Println("Loading configuration from file:", configPathRaw)
+
+	// Replace home directory if "~" was specified.
+	if strings.Contains(configPathRaw, "~") {
+		u, err := user.Current()
+		if err != nil {
+			log.Fatalln("Failed to get current user's data:", err.Error())
+		}
+
+		configPathRaw = strings.Replace(configPathRaw, "~", u.HomeDir, 1)
+	}
+
+	// Get absolute path to configuration file.
+	configPath, err := filepath.Abs(configPathRaw)
+	if err != nil {
+		log.Fatalln("Failed to get real configuration file path:", err.Error())
+	}
+
+	// Read it.
+	configFileData, err := ioutil.ReadFile(configPath)
+	if err != nil {
+		log.Fatalln("Failed to load configuration file data:", err.Error())
+	}
+
+	// Parse it.
+	Cfg = &Config{}
+	err1 := yaml.Unmarshal(configFileData, Cfg)
+	if err1 != nil {
+		log.Fatalln("Failed to parse configuration file:", err1.Error())
+	}
+
+	log.Printf("Configuration file parsed: %+v\n", Cfg)
+}

config/struct.go

@@ -0,0 +1,11 @@
+package config
+
+// Config represents whole configuration file structure.
+type Config struct {
+	NATS Nats `yaml:"nats"`
+}
+
+// Nats represents NATS connection configuration.
+type Nats struct {
+	ConnectionString string `yaml:"connection_string"`
+}