add debug buffer time based access

debug/buffer/buffer.go

@@ -3,12 +3,18 @@ package buffer
 
 import (
 	"sync"
+	"time"
 )
 
 type Buffer struct {
 	size int
 	sync.RWMutex
-	vals []interface{}
+	vals []*Entry
+}
+
+type Entry struct {
+	Value     interface{}
+	Timestamp time.Time
 }
 
 func (b *Buffer) Put(v interface{}) {
@@ -16,7 +22,10 @@ func (b *Buffer) Put(v interface{}) {
 	defer b.Unlock()
 
 	// append to values
-	b.vals = append(b.vals, v)
+	b.vals = append(b.vals, &Entry{
+		Value:     v,
+		Timestamp: time.Now(),
+	})
 
 	// trim if bigger than size required
 	if len(b.vals) > b.size {
@@ -25,7 +34,7 @@ func (b *Buffer) Put(v interface{}) {
 }
 
 // Get returns the last n entries
-func (b *Buffer) Get(n int) []interface{} {
+func (b *Buffer) Get(n int) []*Entry {
 	// reset any invalid values
 	if n > b.size || n < 0 {
 		n = b.size
@@ -46,6 +55,34 @@ func (b *Buffer) Get(n int) []interface{} {
 	return b.vals[delta:]
 }
 
+// Return the entries since a specific time
+func (b *Buffer) Since(t time.Time) []*Entry {
+	b.RLock()
+	defer b.RUnlock()
+
+	// return all the values
+	if t.IsZero() {
+		return b.vals
+	}
+
+	// if its in the future return nothing
+	if time.Since(t).Seconds() < 0.0 {
+		return nil
+	}
+
+	for i, v := range b.vals {
+		// find the starting point
+		d := v.Timestamp.Sub(t)
+
+		// return the values
+		if d.Seconds() > 0.0 {
+			return b.vals[i:]
+		}
+	}
+
+	return nil
+}
+
 func (b *Buffer) Size() int {
 	return b.size
 }