From f6e2cc3890ea9a11e4aad38d67a91751ecc38304 Mon Sep 17 00:00:00 2001
From: Sergey Cherepanov <cheggaaa@gmail.com>
Date: Wed, 1 Feb 2023 21:38:47 +0300
Subject: [PATCH] ldiff: Len

---
 app/ldiff/diff.go      | 8 ++++++++
 app/ldiff/diff_test.go | 1 +
 2 files changed, 9 insertions(+)

diff --git a/app/ldiff/diff.go b/app/ldiff/diff.go
index dd49d980..f0a2f197 100644
--- a/app/ldiff/diff.go
+++ b/app/ldiff/diff.go
@@ -94,6 +94,8 @@ type Diff interface {
 	Ids() []string
 	// Hash returns hash of all elements in the diff
 	Hash() string
+	// Len returns count of elements in the diff
+	Len() int
 }
 
 // Remote interface for using in the Diff
@@ -159,6 +161,12 @@ func (d *diff) Ids() (ids []string) {
 	return
 }
 
+func (d *diff) Len() int {
+	d.mu.RLock()
+	defer d.mu.RUnlock()
+	return d.sl.Len()
+}
+
 func (d *diff) Elements() (elements []Element) {
 	d.mu.RLock()
 	defer d.mu.RUnlock()
diff --git a/app/ldiff/diff_test.go b/app/ldiff/diff_test.go
index 682bf1d5..e15f6b82 100644
--- a/app/ldiff/diff_test.go
+++ b/app/ldiff/diff_test.go
@@ -179,6 +179,7 @@ func TestDiff_Ids(t *testing.T) {
 	gotIds := d.Ids()
 	sort.Strings(gotIds)
 	assert.Equal(t, ids, gotIds)
+	assert.Equal(t, len(ids), d.Len())
 }
 
 func TestDiff_Elements(t *testing.T) {