Chore: able to deploy with environment variables (#36)

pkg/conf/data.go

@@ -1,24 +1,49 @@
 package conf
 
+import (
+	"os"
+	"strconv"
+)
+
+func env(name string, defaultValue string) string {
+	env := os.Getenv(name)
+	if env == "" {
+		return defaultValue
+	}
+	return env
+}
+
+func envNum(name string, defaultValue int) int {
+	env := os.Getenv(name)
+	if env == "" {
+		return defaultValue
+	}
+	num, err := strconv.Atoi(env)
+	if err != nil {
+		return defaultValue
+	}
+	return num
+}
+
 var SystemConfig = &system{
-	Listen: ":8080",
-	Debug:  true,
+	Listen: env("LISTEN", ":8080"),
+	Debug:  env("DEBUG", "false") == "true",
 }
 
 var DataSourceConfig = &datasource{
-	Driver:   "sqlite3",
-	Host:     "localhost",
-	Port:     3306,
-	Database: "leziapi",
-	Username: "root",
-	Password: "root",
-	File:     "leziapi.db",
-	Prefix:   "lezi_",
+	Driver:   env("DB_DRIVER", "sqlite3"),
+	Host:     env("DB_HOST", "localhost"),
+	Port:     envNum("DB_PORT", 3306),
+	Database: env("DB_DATABASE", "leziapi"),
+	Username: env("DB_USERNAME", "root"),
+	Password: env("DB_PASSWORD", "root"),
+	File:     env("DB_FILE", "leziapi.db"),
+	Prefix:   env("DB_PREFIX", "lezi_"),
 }
 
 var RedisConfig = &redis{
-	Network:  "tcp",
-	Server:   "",
-	Password: "",
-	DB:       0,
+	Network:  env("REDIS_NETWORK", "tcp"),
+	Server:   env("REDIS_SERVER", ""),
+	Password: env("REDIS_PASSWORD", ""),
+	DB:       envNum("REDIS_DB", 0),
 }