Multiple Exporters and custom Exporters support added.

exporter/json.go

@@ -0,0 +1,43 @@
+package exporter
+
+import (
+	"encoding/json"
+	"fmt"
+	"os"
+	"sync"
+)
+
+// JSONExporter exports response data as JSON streaming file
+type JSONExporter struct {
+	Filename   string
+	EscapeHTML bool
+
+	file *os.File
+	once sync.Once
+}
+
+// Export exports response data as JSON streaming file
+func (e JSONExporter) Export(exports chan interface{}) {
+
+	// Default Filename
+	if e.Filename == "" {
+		e.Filename = "out.json"
+	}
+
+	// Create File
+	e.once.Do(func() {
+		newFile, err := os.OpenFile(e.Filename, os.O_RDWR|os.O_CREATE|os.O_APPEND, 0666)
+		if err != nil {
+			fmt.Fprintf(os.Stderr, "output file creation error: %v", err)
+			return
+		}
+		e.file = newFile
+	})
+
+	// Export data as responses came
+	for res := range exports {
+		encoder := json.NewEncoder(e.file)
+		encoder.SetEscapeHTML(e.EscapeHTML)
+		encoder.Encode(res)
+	}
+}