Caching added.

JSON File export will append, not truncate.

export.go

@@ -4,14 +4,21 @@ import (
 	"encoding/json"
 	"fmt"
 	"os"
+	"sync"
 )
 
+var file *os.File
+var once sync.Once
+
 func Export(response *Response) {
-	file, err := os.Create("out.json")
-	if err != nil {
-		fmt.Fprintf(os.Stderr, "output file creation error: %v", err)
-		return
-	}
+	once.Do(func() {
+		newFile, err := os.OpenFile("out.json", os.O_RDWR|os.O_CREATE|os.O_APPEND, 0666)
+		if err != nil {
+			fmt.Fprintf(os.Stderr, "output file creation error: %v", err)
+			return
+		}
+		file = newFile
+	})
 
 	for res := range response.Exports {
 		//fmt.Println(res)