Improve responsiveness of request and response viewing.

- Computing the view of a large body is expensive, so we introduce an LRU cache
to hold the latest 20 results.

- Use ListView more correctly, passing it individual urwid.Text snippets,
rather than a single large one. This hugely improves render time.

1 files changed, 31 insertions, 0 deletions

diff --git a/test/test_utils.py b/test/test_utils.py
index c7d4e03f..434d6b26 100644
--- a/test/test_utils.py
+++ b/test/test_utils.py
@@ -310,6 +310,36 @@ class udummy_cert(libpry.AutoTree):
         assert os.path.exists(os.path.join(d, "foo.com.pem"))
 
 
+class uLRUCache(libpry.AutoTree):
+    def test_one(self):
+        class Foo:
+            ran = False
+            @utils.LRUCache(2)
+            def one(self, x):
+                self.ran = True
+                return x
+
+        f = Foo()
+        assert f.one(1) == 1
+        assert f.ran
+        f.ran = False
+        assert f.one(1) == 1
+        assert not f.ran
+
+        f.ran = False
+        assert f.one(1) == 1
+        assert not f.ran
+        assert f.one(2) == 2
+        assert f.one(3) == 3
+        assert f.ran
+
+        f.ran = False
+        assert f.one(1) == 1
+        assert f.ran
+
+        assert len(f._cached_one) == 2
+        assert len(f._cachelist_one) == 2
+
 
 tests = [
     uformat_timestamp(),
@@ -324,4 +354,5 @@ tests = [
     upretty_xmlish(),
     udummy_ca(),
     udummy_cert(),
+    uLRUCache(),
 ]