Convert monitor to http server

monitor/item.go

@@ -1,21 +1,48 @@
 package monitor
 
 import (
+	"encoding/json"
+	"errors"
 	"time"
 
 	"github.com/golang-collections/go-datastructures/queue"
 )
 
+type Duration struct {
+	time.Duration
+}
+
+func (d *Duration) UnmarshalJSON(b []byte) error {
+	var v interface{}
+	if err := json.Unmarshal(b, &v); err != nil {
+		return err
+	}
+	switch value := v.(type) {
+	case float64:
+		d.Duration = time.Duration(value)
+		return nil
+	case string:
+		var err error
+		d.Duration, err = time.ParseDuration(value)
+		if err != nil {
+			return err
+		}
+		return nil
+	default:
+		return errors.New("invalid duration")
+	}
+}
+
 type Item struct {
-	url      string
-	interval time.Duration
+	URL      string
+	Interval Duration
 	next     time.Time
 }
 
-func NewItem(url string, interval time.Duration) *Item {
+func NewItem(URL string, Interval time.Duration) *Item {
 	return &Item{
-		url:      url,
-		interval: interval,
+		URL:      URL,
+		Interval: Duration{Interval},
 		next:     time.Now(),
 	}
 }
@@ -30,15 +57,15 @@ func (item *Item) Compare(other queue.Item) int {
 	} else if item.next.After(j.next) {
 		return 1
 	}
-	if item.interval < j.interval {
+	if item.Interval.Duration < j.Interval.Duration {
 		return -1
-	} else if item.interval > j.interval {
+	} else if item.Interval.Duration > j.Interval.Duration {
 		return 1
 	}
 	return 0
 }
 
 func (item *Item) increment() *Item {
-	item.next = time.Now().Add(item.interval)
+	item.next = time.Now().Add(item.Interval.Duration)
 	return item
 }