Append tokens to a back up file

aob.go

@@ -0,0 +1,57 @@
+package main
+
+import (
+	"encoding/json"
+	"log"
+	"os"
+	"time"
+)
+
+var bus BackUpService
+
+type BackUpService struct {
+	entries chan *aobEntry
+}
+
+func (bus *BackUpService) Run() {
+	bus.entries = make(chan *aobEntry, 50)
+	go func() {
+		for {
+			entry := <-bus.entries
+			data, err := entry.MarshalBinary()
+			if err != nil {
+				log.Printf("Unable to marshal aob entry: %s", err.Error())
+				continue
+			}
+			err = appendToBackUp(data)
+			if err != nil {
+				log.Printf("Unable to append aob entry to file: %s", err.Error())
+				continue
+			}
+		}
+	}()
+}
+
+type aobEntry struct {
+	Key      string        `json:"key"`
+	Token    *Token        `json:"token"`
+	Duration time.Duration `json:"duration"`
+}
+
+func (entry *aobEntry) MarshalBinary() (data []byte, err error) {
+	return json.Marshal(entry)
+}
+
+func ItemInserted(key string, token *Token, duration time.Duration) error {
+	entry := &aobEntry{Key: key, Token: token, Duration: duration}
+	bus.entries <- entry
+	return nil
+}
+
+func appendToBackUp(data []byte) error {
+	f, err := os.OpenFile("test.aob", os.O_CREATE|os.O_APPEND|os.O_WRONLY, 0600)
+	defer f.Close()
+	f.Write(data)
+	f.WriteString("\n")
+	return err
+}

aob_test.go

@@ -0,0 +1,32 @@
+package main
+
+import (
+	"fmt"
+	"testing"
+	"time"
+)
+
+func TestItemInserted(t *testing.T) {
+	bus = BackUpService{}
+	bus.Run()
+	token := &Token{1, "test", "Token"}
+
+	err := ItemInserted("a_new_key", token, time.Minute)
+	if err != nil {
+		t.Errorf(err.Error())
+		t.FailNow()
+	}
+}
+
+func TestEntryEncodesIntoJson(t *testing.T) {
+	token := &Token{1, "test", "Token"}
+	json, err := token.MarshalBinary()
+	if err != nil {
+		t.Errorf(err.Error())
+		t.FailNow()
+	}
+	if fmt.Sprintf("%s", json) != "{\"user_id\":\"1\",\"scenario\":\"test\",\"Token\":\"Token\"}" {
+		t.Errorf("Entry did not encode: %s", json)
+		t.FailNow()
+	}
+}