create config and metadata if none exists

main.go

@@ -6,7 +6,9 @@ import (
 	configTypes "grain/config/types"
 	"grain/relay"
 	"grain/relay/db"
+	"grain/relay/utils"
 	"grain/web"
+
 	"log"
 	"net/http"
 
@@ -14,6 +16,9 @@ import (
 )
 
 func main() {
+	utils.EnsureFileExists("config.yml", "config/config.example.yml")
+	utils.EnsureFileExists("relay_metadata.json", "web/relay_metadata.example.json")
+
 	cfg, err := config.LoadConfig("config.yml")
 	if err != nil {
 		log.Fatal("Error loading config: ", err)

relay/utils/copyFile.go

@@ -0,0 +1,31 @@
+package utils
+
+import (
+	"io"
+	"os"
+	"path/filepath"
+)
+
+func copyFile(src, dst string) error {
+	sourceFile, err := os.Open(src)
+	if err != nil {
+		return err
+	}
+	defer sourceFile.Close()
+
+	// Create the directory for the destination file if it doesn't exist
+	destDir := filepath.Dir(dst)
+	err = os.MkdirAll(destDir, os.ModePerm)
+	if err != nil {
+		return err
+	}
+
+	destinationFile, err := os.Create(dst)
+	if err != nil {
+		return err
+	}
+	defer destinationFile.Close()
+
+	_, err = io.Copy(destinationFile, sourceFile)
+	return err
+}

relay/utils/ensureFileExists.go

@@ -0,0 +1,15 @@
+package utils
+
+import (
+	"log"
+	"os"
+)
+
+func EnsureFileExists(filePath, examplePath string) {
+	if _, err := os.Stat(filePath); os.IsNotExist(err) {
+		err = copyFile(examplePath, filePath)
+		if err != nil {
+			log.Fatalf("Failed to copy %s to %s: %v", examplePath, filePath, err)
+		}
+	}
+}