Add performance benchmarks, stress tests, and frontend perf tests

Go benchmarks cover item CRUD/filter/sanitization, API endpoints (stream,
item update, feed list), middleware stack (gzip, security headers, CSRF),
and crawler pipeline (feed parsing, mocked crawl). Stress tests verify
concurrent reads/writes and large dataset handling. Frontend perf tests
measure template generation, DOM insertion, and store event throughput.

New Makefile targets: bench, bench-short, stress, test-perf.

https://claude.ai/code/session_01ChDVWFDrQoFjMYHpaLGr9s

1 files changed, 141 insertions, 0 deletions

diff --git a/internal/crawler/crawler_bench_test.go b/internal/crawler/crawler_bench_test.go
new file mode 100644
index 0000000..90d92cc
--- /dev/null
+++ b/internal/crawler/crawler_bench_test.go
@@ -0,0 +1,141 @@
+package crawler
+
+import (
+	"net/http"
+	"net/http/httptest"
+	"testing"
+
+	"adammathes.com/neko/config"
+	"adammathes.com/neko/internal/safehttp"
+	"adammathes.com/neko/models"
+	"adammathes.com/neko/models/feed"
+
+	"github.com/mmcdole/gofeed"
+)
+
+const testRSSFeed = `<?xml version="1.0" encoding="UTF-8"?>
+<rss version="2.0">
+  <channel>
+    <title>Bench Test Feed</title>
+    <link>https://example.com</link>
+    <description>A feed for benchmarking</description>
+    <item>
+      <title>Article One</title>
+      <link>https://example.com/1</link>
+      <description>&lt;p&gt;First article with &lt;b&gt;bold&lt;/b&gt; and &lt;a href="https://example.com"&gt;link&lt;/a&gt;&lt;/p&gt;</description>
+      <pubDate>Mon, 01 Jan 2024 00:00:00 +0000</pubDate>
+    </item>
+    <item>
+      <title>Article Two</title>
+      <link>https://example.com/2</link>
+      <description>&lt;p&gt;Second article with some content&lt;/p&gt;</description>
+      <pubDate>Tue, 02 Jan 2024 00:00:00 +0000</pubDate>
+    </item>
+    <item>
+      <title>Article Three</title>
+      <link>https://example.com/3</link>
+      <description>&lt;p&gt;Third article&lt;/p&gt;</description>
+      <pubDate>Wed, 03 Jan 2024 00:00:00 +0000</pubDate>
+    </item>
+    <item>
+      <title>Article Four</title>
+      <link>https://example.com/4</link>
+      <description>&lt;p&gt;Fourth article with &lt;img src="https://example.com/img.jpg"&gt;&lt;/p&gt;</description>
+      <pubDate>Thu, 04 Jan 2024 00:00:00 +0000</pubDate>
+    </item>
+    <item>
+      <title>Article Five</title>
+      <link>https://example.com/5</link>
+      <description>&lt;p&gt;Fifth article&lt;/p&gt;</description>
+      <pubDate>Fri, 05 Jan 2024 00:00:00 +0000</pubDate>
+    </item>
+    <item>
+      <title>Article Six</title>
+      <link>https://example.com/6</link>
+      <description>&lt;p&gt;Sixth article&lt;/p&gt;</description>
+      <pubDate>Sat, 06 Jan 2024 00:00:00 +0000</pubDate>
+    </item>
+    <item>
+      <title>Article Seven</title>
+      <link>https://example.com/7</link>
+      <description>&lt;p&gt;Seventh article&lt;/p&gt;</description>
+      <pubDate>Sun, 07 Jan 2024 00:00:00 +0000</pubDate>
+    </item>
+    <item>
+      <title>Article Eight</title>
+      <link>https://example.com/8</link>
+      <description>&lt;p&gt;Eighth article&lt;/p&gt;</description>
+      <pubDate>Mon, 08 Jan 2024 00:00:00 +0000</pubDate>
+    </item>
+    <item>
+      <title>Article Nine</title>
+      <link>https://example.com/9</link>
+      <description>&lt;p&gt;Ninth article with longer content to simulate a real feed item that has more text in it&lt;/p&gt;</description>
+      <pubDate>Tue, 09 Jan 2024 00:00:00 +0000</pubDate>
+    </item>
+    <item>
+      <title>Article Ten</title>
+      <link>https://example.com/10</link>
+      <description>&lt;p&gt;Tenth article&lt;/p&gt;</description>
+      <pubDate>Wed, 10 Jan 2024 00:00:00 +0000</pubDate>
+    </item>
+  </channel>
+</rss>`
+
+func BenchmarkParseFeed(b *testing.B) {
+	fp := gofeed.NewParser()
+
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		_, err := fp.ParseString(testRSSFeed)
+		if err != nil {
+			b.Fatal(err)
+		}
+	}
+}
+
+func BenchmarkCrawlFeedMocked(b *testing.B) {
+	safehttp.AllowLocal = true
+
+	ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("Content-Type", "application/rss+xml")
+		w.WriteHeader(200)
+		w.Write([]byte(testRSSFeed))
+	}))
+	defer ts.Close()
+
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		// Each iteration needs a fresh DB since CrawlFeed inserts items
+		config.Config.DBFile = ":memory:"
+		models.InitDB()
+
+		f := &feed.Feed{Url: ts.URL, Title: "Bench Feed"}
+		f.Create()
+
+		ch := make(chan string, 1)
+		CrawlFeed(f, ch)
+		<-ch
+
+		models.DB.Close()
+	}
+}
+
+func BenchmarkGetFeedContent(b *testing.B) {
+	safehttp.AllowLocal = true
+
+	ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("Content-Type", "application/rss+xml")
+		w.WriteHeader(200)
+		w.Write([]byte(testRSSFeed))
+	}))
+	defer ts.Close()
+
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		content := GetFeedContent(ts.URL)
+		if content == "" {
+			b.Fatal("empty content")
+		}
+	}
+}