| 1 | package tinygit |
| 2 | |
| 3 | import ( |
| 4 | "context" |
| 5 | "crypto/tls" |
| 6 | "io" |
| 7 | "net/http" |
| 8 | "net/http/httptest" |
| 9 | "net/url" |
| 10 | "strings" |
| 11 | "sync/atomic" |
| 12 | "testing" |
| 13 | "time" |
| 14 | ) |
| 15 | |
| 16 | func repairProxyClient(t *testing.T, ctx context.Context, target string, budget *byteBudget, limit int64) (*repairProxy, *http.Client) { |
| 17 | t.Helper() |
| 18 | u, err := url.Parse(target) |
| 19 | if err != nil { |
| 20 | t.Fatal(err) |
| 21 | } |
| 22 | proxy, err := newRepairProxy(ctx, u.Hostname(), u.Hostname(), u.Port(), budget, limit) |
| 23 | if err != nil { |
| 24 | t.Fatal(err) |
| 25 | } |
| 26 | t.Cleanup(func() { _ = proxy.Close() }) |
| 27 | proxyURL, _ := url.Parse(proxy.URL()) |
| 28 | transport := &http.Transport{Proxy: http.ProxyURL(proxyURL), TLSClientConfig: &tls.Config{InsecureSkipVerify: true}} // Local test server's self-signed certificate. |
| 29 | t.Cleanup(transport.CloseIdleConnections) |
| 30 | return proxy, &http.Client{Transport: transport, Timeout: 5 * time.Second} |
| 31 | } |
| 32 | |
| 33 | func TestRepairProxyEnforcesSharedResponseBudget(t *testing.T) { |
| 34 | var requests atomic.Int32 |
| 35 | server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { |
| 36 | requests.Add(1) |
| 37 | if r.URL.Path == "/small" { |
| 38 | _, _ = io.WriteString(w, "first" ) |
| 39 | return |
| 40 | } |
| 41 | _, _ = io.WriteString(w, strings.Repeat("x" , 8192)) |
| 42 | })) |
| 43 | defer server.Close() |
| 44 | budget := &byteBudget{} |
| 45 | _, client := repairProxyClient(t, context.Background(), server.URL, budget, 2048) |
| 46 | response, err := client.Get(server.URL + "/small" ) |
| 47 | if err != nil { |
| 48 | t.Fatal(err) |
| 49 | } |
| 50 | body, err := io.ReadAll(response.Body) |
| 51 | response.Body.Close() |
| 52 | if err != nil || string(body) != "first" { |
| 53 | t.Fatalf("first response = %q, %v" , body, err) |
| 54 | } |
| 55 | before := budget.used.Load() |
| 56 | if before == 0 || before >= 2048 { |
| 57 | t.Fatalf("first request consumed %d bytes" , before) |
| 58 | } |
| 59 | response, err = client.Get(server.URL + "/large" ) |
| 60 | if err == nil { |
| 61 | body, err = io.ReadAll(response.Body) |
| 62 | response.Body.Close() |
| 63 | if len(body) >= 2048 { |
| 64 | t.Fatalf("oversized response leaked %d bytes" , len(body)) |
| 65 | } |
| 66 | } |
| 67 | if err == nil { |
| 68 | t.Fatal("oversized response completed" ) |
| 69 | } |
| 70 | if budget.used.Load() != 2048 { |
| 71 | t.Fatalf("budget = %d, want 2048" , budget.used.Load()) |
| 72 | } |
| 73 | if requests.Load() != 2 { |
| 74 | t.Fatalf("upstream requests = %d, want two" , requests.Load()) |
| 75 | } |
| 76 | if response, err = client.Get(server.URL + "/small" ); err == nil { |
| 77 | response.Body.Close() |
| 78 | t.Fatal("request passed after shared budget exhausted" ) |
| 79 | } |
| 80 | if requests.Load() != 2 { |
| 81 | t.Fatal("exhausted proxy contacted upstream" ) |
| 82 | } |
| 83 | } |
| 84 | |
| 85 | func TestRepairProxyLimitsHTTPSTunnel(t *testing.T) { |
| 86 | server := httptest.NewTLSServer(http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) { |
| 87 | _, _ = io.WriteString(w, strings.Repeat("x" , 256<<10)) |
| 88 | })) |
| 89 | defer server.Close() |
| 90 | budget := &byteBudget{} |
| 91 | _, client := repairProxyClient(t, context.Background(), server.URL, budget, 64<<10) |
| 92 | response, err := client.Get(server.URL) |
| 93 | if err == nil { |
| 94 | body, bodyErr := io.ReadAll(response.Body) |
| 95 | response.Body.Close() |
| 96 | if len(body) >= 64<<10 { |
| 97 | t.Fatalf("HTTPS body exceeded wire budget: %d" , len(body)) |
| 98 | } |
| 99 | err = bodyErr |
| 100 | } |
| 101 | if err == nil { |
| 102 | t.Fatal("oversized HTTPS body completed" ) |
| 103 | } |
| 104 | if budget.used.Load() != 64<<10 { |
| 105 | t.Fatalf("HTTPS budget = %d" , budget.used.Load()) |
| 106 | } |
| 107 | } |
| 108 | |
| 109 | func TestRepairProxyCancellationInterruptsStalledUpstream(t *testing.T) { |
| 110 | started := make(chan struct{}) |
| 111 | server := httptest.NewServer(http.HandlerFunc(func(_ http.ResponseWriter, r *http.Request) { |
| 112 | close(started) |
| 113 | <-r.Context().Done() |
| 114 | })) |
| 115 | defer server.Close() |
| 116 | ctx, cancel := context.WithCancel(context.Background()) |
| 117 | defer cancel() |
| 118 | _, client := repairProxyClient(t, ctx, server.URL, &byteBudget{}, 4096) |
| 119 | done := make(chan error, 1) |
| 120 | go func() { |
| 121 | response, err := client.Get(server.URL) |
| 122 | if response != nil { |
| 123 | response.Body.Close() |
| 124 | } |
| 125 | done <- err |
| 126 | }() |
| 127 | select { |
| 128 | case <-started: |
| 129 | case <-time.After(5 * time.Second): |
| 130 | t.Fatal("upstream did not receive request" ) |
| 131 | } |
| 132 | cancel() |
| 133 | select { |
| 134 | case err := <-done: |
| 135 | if err == nil { |
| 136 | t.Fatal("canceled request succeeded" ) |
| 137 | } |
| 138 | case <-time.After(time.Second): |
| 139 | t.Fatal("cancel did not interrupt stalled request" ) |
| 140 | } |
| 141 | } |
| 142 | |
| 143 | func TestRepairProxyRejectsAnotherPort(t *testing.T) { |
| 144 | var contacted atomic.Bool |
| 145 | server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) { contacted.Store(true) })) |
| 146 | defer server.Close() |
| 147 | _, client := repairProxyClient(t, context.Background(), "http://127.0.0.1:1" , &byteBudget{}, 4096) |
| 148 | if response, err := client.Get(server.URL); err == nil { |
| 149 | response.Body.Close() |
| 150 | t.Fatal("proxy accepted a different port" ) |
| 151 | } |
| 152 | if contacted.Load() { |
| 153 | t.Fatal("proxy contacted a different target" ) |
| 154 | } |
| 155 | } |