api,db: add comments count endpoint

Closes https://gitlab.com/commento/commento-ce/issues/27

api/comment_count_test.go

@@ -0,0 +1,54 @@
+package main
+
+import (
+	"testing"
+	"time"
+)
+
+func TestCommentCountBasics(t *testing.T) {
+	failTestOnError(t, setupTestEnv())
+
+	commenterHex, _ := commenterNew("test@example.com", "Test", "undefined", "http://example.com/photo.jpg", "google", "")
+
+	commentNew(commenterHex, "example.com", "/path.html", "root", "**foo**", "approved", time.Now().UTC())
+	commentNew(commenterHex, "example.com", "/path.html", "root", "**bar**", "approved", time.Now().UTC())
+	commentNew(commenterHex, "example.com", "/path.html", "root", "**baz**", "unapproved", time.Now().UTC())
+
+	count, err := commentCount("example.com", "/path.html")
+	if err != nil {
+		t.Errorf("unexpected error counting comments: %v", err)
+		return
+	}
+
+	if count != 2 {
+		t.Errorf("expected count=2 got count=%d", count)
+		return
+	}
+}
+
+func TestCommentCountNewPage(t *testing.T) {
+	failTestOnError(t, setupTestEnv())
+
+	count, err := commentCount("example.com", "/path.html")
+	if err != nil {
+		t.Errorf("unexpected error counting comments: %v", err)
+		return
+	}
+
+	if count != 0 {
+		t.Errorf("expected count=0 got count=%d", count)
+		return
+	}
+}
+
+func TestCommentCountEmpty(t *testing.T) {
+	if _, err := commentCount("example.com", ""); err != nil {
+		t.Errorf("unexpected error counting comments on empty path: %v", err)
+		return
+	}
+
+	if _, err := commentCount("", ""); err == nil {
+		t.Errorf("expected error not found counting comments with empty everything")
+		return
+	}
+}