Dependency injection, example .env, and config handling

app/app.go

@@ -0,0 +1,12 @@
+package app
+
+import (
+	"GoWeb/config"
+	"database/sql"
+)
+
+// App contains and supplies available configurations and connections
+type App struct {
+	Config config.Configuration
+	Db     *sql.DB
+}

config/config.go

@@ -0,0 +1,49 @@
+package config
+
+import (
+	"encoding/json"
+	"flag"
+	"log"
+	"os"
+)
+
+type Configuration struct {
+	Db struct {
+		Ip       string `json:"DbIp"`
+		Port     string `json:"DbPort"`
+		Name     string `json:"DbName"`
+		User     string `json:"DbUser"`
+		Password string `json:"DbPassword"`
+	}
+
+	Listen struct {
+		Ip   string `json:"HttpIp"`
+		Port string `json:"HttpPort"`
+	}
+
+	Template struct {
+		BaseName string `json:"BaseTemplateName"`
+	}
+}
+
+// LoadConfig loads and returns a configuration struct
+func LoadConfig() Configuration {
+	c := flag.String("c", "env.json", "Path to the json configuration file")
+	flag.Parse()
+	file, err := os.Open(*c)
+	if err != nil {
+		log.Fatal("Unable to open config JSON file: ", err)
+	}
+
+	defer file.Close()
+
+	// Decode json config file to Configuration struct named config
+	decoder := json.NewDecoder(file)
+	Config := Configuration{}
+	err = decoder.Decode(&Config)
+	if err != nil {
+		log.Fatal("Unable to decode config JSON file: ", err)
+	}
+
+	return Config
+}

env_example.json

@@ -0,0 +1,16 @@
+{
+  "Db": {
+    "DbIp": "127.0.0.1",
+    "DbPort": "5432",
+    "DbName": "database",
+    "DbUser": "user",
+    "DbPassword": "password"
+  },
+  "Listen": {
+    "HttpIp": "127.0.0.1",
+    "HttpPort": "8090"
+  },
+  "Template": {
+    "BaseTemplateName": "templates/base.html"
+  }
+}