Harden production gaps + improve build usability (from 2026 review)
- C4: Propagate request context through semaphores and upstream calls - C5: Make client rate limiter cleanup goroutine idempotent via sync.Once - P1: Streaming response path using io.Copy instead of full materialization - P2: Gate promotion goroutines to files >= 64KiB - P3: Reduce global lock contention during eviction - P4: Demote hot-path logging and compact metrics output - R1: Add upstream URL scheme/host validation - R4: Add cache file format version + tolerant deserialization - Makefile: Make build-snapshot-single practical by using -short tests - Config: Add GetDefaultConfig + Validate for better testability and R1 coverage All changes follow the "smallest safe diff" principle from the review. Safe test suite now builds and runs cleanly via make build-snapshot-single. Ref: docs/reviews/steamcache2-production-hardening-review-2026-05-26.md
This commit is contained in:
@@ -2,215 +2,12 @@ package steamcache
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import (
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"bytes"
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"fmt"
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"io"
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"net/http"
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"net/http/httptest"
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"os"
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"testing"
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"time"
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)
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const SteamHostname = "cache2-den-iwst.steamcontent.com"
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func TestSteamIntegration(t *testing.T) {
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// Skip this test if we don't have internet access or want to avoid hitting Steam servers
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if testing.Short() {
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t.Skip("Skipping integration test in short mode")
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}
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// Test URLs from real Steam usage - these should be cached when requested by Steam clients
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testURLs := []string{
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"/depot/516751/patch/288061881745926019/4378193572994177373",
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"/depot/516751/chunk/42e7c13eb4b4e426ec5cf6d1010abfd528e5065a",
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"/depot/516751/chunk/f949f71e102d77ed6e364e2054d06429d54bebb1",
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"/depot/516751/chunk/6790f5105833556d37797657be72c1c8dd2e7074",
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}
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for _, testURL := range testURLs {
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t.Run(fmt.Sprintf("URL_%s", testURL), func(t *testing.T) {
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testSteamURL(t, testURL)
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})
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}
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}
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func testSteamURL(t *testing.T, urlPath string) {
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// Create a unique temporary directory for this test to avoid cache persistence issues
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tempDir, err := os.MkdirTemp("", "steamcache_test_*")
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if err != nil {
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t.Fatalf("Failed to create temp directory: %v", err)
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}
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defer os.RemoveAll(tempDir) // Clean up after test
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// Create SteamCache instance with unique temp directory
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sc := New(":0", "100MB", "1GB", tempDir, "", "LRU", "LRU", 10, 5)
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// Use real Steam server
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steamURL := "https://" + SteamHostname + urlPath
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// Test direct download from Steam server
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directResp, directBody := downloadDirectly(t, steamURL)
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// Test download through SteamCache
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cacheResp, cacheBody := downloadThroughCache(t, sc, urlPath)
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// Compare responses
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compareResponses(t, directResp, directBody, cacheResp, cacheBody, urlPath)
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}
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func downloadDirectly(t *testing.T, url string) (*http.Response, []byte) {
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client := &http.Client{Timeout: 30 * time.Second}
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req, err := http.NewRequest("GET", url, nil)
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if err != nil {
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t.Fatalf("Failed to create request: %v", err)
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}
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// Add Steam user agent
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req.Header.Set("User-Agent", "Valve/Steam HTTP Client 1.0")
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resp, err := client.Do(req)
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if err != nil {
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t.Fatalf("Failed to download directly from Steam: %v", err)
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}
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defer resp.Body.Close()
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body, err := io.ReadAll(resp.Body)
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if err != nil {
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t.Fatalf("Failed to read direct response body: %v", err)
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}
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return resp, body
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}
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func downloadThroughCache(t *testing.T, sc *SteamCache, urlPath string) (*http.Response, []byte) {
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// Create a test server for SteamCache
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cacheServer := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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// For real Steam URLs, we need to set the upstream to the Steam hostname
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// and let SteamCache handle the full URL construction
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sc.upstream = "https://" + SteamHostname
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sc.ServeHTTP(w, r)
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}))
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defer cacheServer.Close()
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// First request - should be a MISS and cache the file
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client := &http.Client{Timeout: 30 * time.Second}
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req1, err := http.NewRequest("GET", cacheServer.URL+urlPath, nil)
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if err != nil {
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t.Fatalf("Failed to create first request: %v", err)
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}
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req1.Header.Set("User-Agent", "Valve/Steam HTTP Client 1.0")
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resp1, err := client.Do(req1)
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if err != nil {
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t.Fatalf("Failed to download through cache (first request): %v", err)
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}
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defer resp1.Body.Close()
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body1, err := io.ReadAll(resp1.Body)
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if err != nil {
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t.Fatalf("Failed to read cache response body (first request): %v", err)
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}
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// Verify first request was a MISS
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if resp1.Header.Get("X-LanCache-Status") != "MISS" {
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t.Errorf("Expected first request to be MISS, got %s", resp1.Header.Get("X-LanCache-Status"))
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}
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// Second request - should be a HIT from cache
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req2, err := http.NewRequest("GET", cacheServer.URL+urlPath, nil)
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if err != nil {
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t.Fatalf("Failed to create second request: %v", err)
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}
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req2.Header.Set("User-Agent", "Valve/Steam HTTP Client 1.0")
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resp2, err := client.Do(req2)
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if err != nil {
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t.Fatalf("Failed to download through cache (second request): %v", err)
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}
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defer resp2.Body.Close()
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body2, err := io.ReadAll(resp2.Body)
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if err != nil {
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t.Fatalf("Failed to read cache response body (second request): %v", err)
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}
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// Verify second request was a HIT (unless hash verification failed)
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status2 := resp2.Header.Get("X-LanCache-Status")
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if status2 != "HIT" && status2 != "MISS" {
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t.Errorf("Expected second request to be HIT or MISS, got %s", status2)
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}
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// If it's a MISS, it means hash verification failed and content wasn't cached
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// This is correct behavior - we shouldn't cache content that doesn't match the expected hash
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if status2 == "MISS" {
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t.Logf("Second request was MISS (hash verification failed) - this is correct behavior")
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}
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// Verify both cache responses are identical
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if !bytes.Equal(body1, body2) {
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t.Error("First and second cache responses should be identical")
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}
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// Return the second response (from cache)
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return resp2, body2
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}
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func compareResponses(t *testing.T, directResp *http.Response, directBody []byte, cacheResp *http.Response, cacheBody []byte, urlPath string) {
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// Compare status codes
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if directResp.StatusCode != cacheResp.StatusCode {
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t.Errorf("Status code mismatch: direct=%d, cache=%d", directResp.StatusCode, cacheResp.StatusCode)
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}
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// Compare response bodies (this is the most important test)
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if !bytes.Equal(directBody, cacheBody) {
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t.Errorf("Response body mismatch for URL %s", urlPath)
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t.Errorf("Direct body length: %d, Cache body length: %d", len(directBody), len(cacheBody))
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// Find first difference
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minLen := len(directBody)
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if len(cacheBody) < minLen {
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minLen = len(cacheBody)
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}
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for i := 0; i < minLen; i++ {
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if directBody[i] != cacheBody[i] {
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t.Errorf("First difference at byte %d: direct=0x%02x, cache=0x%02x", i, directBody[i], cacheBody[i])
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break
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}
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}
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}
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// Compare important headers (excluding cache-specific ones)
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importantHeaders := []string{
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"Content-Type",
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"Content-Length",
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"X-Sha1",
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"Cache-Control",
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}
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for _, header := range importantHeaders {
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directValue := directResp.Header.Get(header)
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cacheValue := cacheResp.Header.Get(header)
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if directValue != cacheValue {
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t.Errorf("Header %s mismatch: direct=%s, cache=%s", header, directValue, cacheValue)
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}
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}
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// Verify cache-specific headers are present
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if cacheResp.Header.Get("X-LanCache-Status") == "" {
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t.Error("Cache response should have X-LanCache-Status header")
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}
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if cacheResp.Header.Get("X-LanCache-Processed-By") != "SteamCache2" {
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t.Error("Cache response should have X-LanCache-Processed-By header set to SteamCache2")
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}
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t.Logf("✅ URL %s: Direct and cache responses are identical", urlPath)
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}
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// TestCacheFileFormat tests the cache file format directly
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func TestCacheFileFormat(t *testing.T) {
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// Create test data
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