| 1 | package main |
| 2 | |
| 3 | import ( |
| 4 | "context" |
| 5 | "fmt" |
| 6 | "io" |
| 7 | "net" |
| 8 | "net/http" |
| 9 | "net/http/httptest" |
| 10 | "os" |
| 11 | "path/filepath" |
| 12 | "strings" |
| 13 | "testing" |
| 14 | "time" |
| 15 | |
| 16 | "github.com/coder/websocket" |
| 17 | ) |
| 18 | |
| 19 | func TestRouterProxiesByHost(t *testing.T) { |
| 20 | // A backend on a unix socket that echoes the Host header it receives. |
| 21 | sock := tmpSock(t) |
| 22 | ln, err := net.Listen("unix", sock) |
| 23 | if err != nil { |
| 24 | t.Fatalf("listen unix: %v", err) |
| 25 | } |
| 26 | backend := &http.Server{Handler: http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { |
| 27 | io.WriteString(w, "backend:"+r.Host) |
| 28 | })} |
| 29 | go backend.Serve(ln) |
| 30 | t.Cleanup(func() { backend.Close() }) |
| 31 | |
| 32 | reg, err := openRegistry(filepath.Join(t.TempDir(), "registry.db")) |
| 33 | if err != nil { |
| 34 | t.Fatalf("open registry: %v", err) |
| 35 | } |
| 36 | if err := reg.upsert(Route{Host: "chat.example.com", Kind: "instance", Socket: sock}); err != nil { |
| 37 | t.Fatalf("upsert: %v", err) |
| 38 | } |
| 39 | rt, err := newRouter(reg, nil) |
| 40 | if err != nil { |
| 41 | t.Fatalf("new router: %v", err) |
| 42 | } |
| 43 | front := httptest.NewServer(rt) |
| 44 | t.Cleanup(front.Close) |
| 45 | |
| 46 | // Known host is proxied, and the backend sees the real Host header. |
| 47 | if body, code := proxyGet(t, front.URL, "chat.example.com"); code != 200 || body != "backend:chat.example.com" { |
| 48 | t.Fatalf("known host: got %d %q, want 200 backend:chat.example.com", code, body) |
| 49 | } |
| 50 | // Unknown host → 404 (and, as HostPolicy, no cert would be issued for it). |
| 51 | if _, code := proxyGet(t, front.URL, "nope.example.com"); code != http.StatusNotFound { |
| 52 | t.Fatalf("unknown host: got %d, want 404", code) |
| 53 | } |
| 54 | if rt.allowed("nope.example.com") { |
| 55 | t.Fatal("allowed() should be false for an unconfigured host") |
| 56 | } |
| 57 | |
| 58 | // A new route isn't served until reload; after reload it is (atomic swap). |
| 59 | if err := reg.upsert(Route{Host: "two.example.com", Kind: "instance", Socket: sock}); err != nil { |
| 60 | t.Fatalf("upsert two: %v", err) |
| 61 | } |
| 62 | if rt.allowed("two.example.com") { |
| 63 | t.Fatal("route should not be live before reload") |
| 64 | } |
| 65 | if err := rt.reload(); err != nil { |
| 66 | t.Fatalf("reload: %v", err) |
| 67 | } |
| 68 | if body, code := proxyGet(t, front.URL, "two.example.com"); code != 200 || body != "backend:two.example.com" { |
| 69 | t.Fatalf("after reload: got %d %q, want 200 backend:two.example.com", code, body) |
| 70 | } |
| 71 | } |
| 72 | |
| 73 | func TestRouterProxiesWebSocket(t *testing.T) { |
| 74 | // A backend WebSocket echo server on a unix socket. |
| 75 | sock := tmpSock(t) |
| 76 | ln, err := net.Listen("unix", sock) |
| 77 | if err != nil { |
| 78 | t.Fatalf("listen unix: %v", err) |
| 79 | } |
| 80 | backend := &http.Server{Handler: http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { |
| 81 | c, err := websocket.Accept(w, r, nil) |
| 82 | if err != nil { |
| 83 | return |
| 84 | } |
| 85 | defer c.Close(websocket.StatusNormalClosure, "") |
| 86 | mt, data, err := c.Read(r.Context()) |
| 87 | if err != nil { |
| 88 | return |
| 89 | } |
| 90 | _ = c.Write(r.Context(), mt, append([]byte("echo:"), data...)) |
| 91 | })} |
| 92 | go backend.Serve(ln) |
| 93 | t.Cleanup(func() { backend.Close() }) |
| 94 | |
| 95 | reg, err := openRegistry(filepath.Join(t.TempDir(), "registry.db")) |
| 96 | if err != nil { |
| 97 | t.Fatalf("open registry: %v", err) |
| 98 | } |
| 99 | // Route the loopback host so the client reaches it without a Host override |
| 100 | // (ServeHTTP strips the port, matching "127.0.0.1"). |
| 101 | if err := reg.upsert(Route{Host: "127.0.0.1", Kind: "instance", Socket: sock}); err != nil { |
| 102 | t.Fatalf("upsert: %v", err) |
| 103 | } |
| 104 | rt, err := newRouter(reg, nil) |
| 105 | if err != nil { |
| 106 | t.Fatalf("new router: %v", err) |
| 107 | } |
| 108 | front := httptest.NewServer(rt) |
| 109 | t.Cleanup(front.Close) |
| 110 | |
| 111 | ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second) |
| 112 | defer cancel() |
| 113 | wsURL := "ws" + strings.TrimPrefix(front.URL, "http") + "/ws" |
| 114 | c, _, err := websocket.Dial(ctx, wsURL, nil) |
| 115 | if err != nil { |
| 116 | t.Fatalf("ws dial through router: %v", err) |
| 117 | } |
| 118 | defer c.Close(websocket.StatusNormalClosure, "") |
| 119 | if err := c.Write(ctx, websocket.MessageText, []byte("hi")); err != nil { |
| 120 | t.Fatalf("ws write: %v", err) |
| 121 | } |
| 122 | _, data, err := c.Read(ctx) |
| 123 | if err != nil { |
| 124 | t.Fatalf("ws read: %v", err) |
| 125 | } |
| 126 | if string(data) != "echo:hi" { |
| 127 | t.Fatalf("ws echo through router: got %q, want %q", data, "echo:hi") |
| 128 | } |
| 129 | } |
| 130 | |
| 131 | func TestIsRetryableDialErr(t *testing.T) { |
| 132 | sock := tmpSock(t) // a path with no listener → ENOENT |
| 133 | if _, err := net.Dial("unix", sock); err == nil { |
| 134 | t.Fatal("expected a dial error for a missing socket") |
| 135 | } else if !isRetryableDialErr(err) { |
| 136 | t.Errorf("missing socket: isRetryableDialErr(%v) = false, want true", err) |
| 137 | } |
| 138 | if isRetryableDialErr(context.Canceled) { |
| 139 | t.Error("context.Canceled should not be retryable") |
| 140 | } |
| 141 | } |
| 142 | |
| 143 | func TestRouterRetriesAcrossRestart(t *testing.T) { |
| 144 | sock := tmpSock(t) |
| 145 | reg, err := openRegistry(filepath.Join(t.TempDir(), "registry.db")) |
| 146 | if err != nil { |
| 147 | t.Fatal(err) |
| 148 | } |
| 149 | if err := reg.upsert(Route{Host: "chat.example.com", Kind: "instance", Socket: sock}); err != nil { |
| 150 | t.Fatal(err) |
| 151 | } |
| 152 | rt, err := newRouter(reg, nil) |
| 153 | if err != nil { |
| 154 | t.Fatal(err) |
| 155 | } |
| 156 | front := httptest.NewServer(rt) |
| 157 | t.Cleanup(front.Close) |
| 158 | |
| 159 | // Fire the request before any backend exists; the router must retry the dial. |
| 160 | type res struct { |
| 161 | code int |
| 162 | body string |
| 163 | } |
| 164 | ch := make(chan res, 1) |
| 165 | go func() { |
| 166 | req, _ := http.NewRequest(http.MethodGet, front.URL+"/", nil) |
| 167 | req.Host = "chat.example.com" |
| 168 | resp, err := http.DefaultClient.Do(req) |
| 169 | if err != nil { |
| 170 | ch <- res{0, "err: " + err.Error()} |
| 171 | return |
| 172 | } |
| 173 | b, _ := io.ReadAll(resp.Body) |
| 174 | resp.Body.Close() |
| 175 | ch <- res{resp.StatusCode, string(b)} |
| 176 | }() |
| 177 | |
| 178 | // Bind the backend after a gap, simulating the instance restart window. |
| 179 | time.Sleep(300 * time.Millisecond) |
| 180 | ln, err := net.Listen("unix", sock) |
| 181 | if err != nil { |
| 182 | t.Fatalf("listen: %v", err) |
| 183 | } |
| 184 | backend := &http.Server{Handler: http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { |
| 185 | io.WriteString(w, "late-backend") |
| 186 | })} |
| 187 | go backend.Serve(ln) |
| 188 | t.Cleanup(func() { backend.Close() }) |
| 189 | |
| 190 | select { |
| 191 | case r := <-ch: |
| 192 | if r.code != 200 || r.body != "late-backend" { |
| 193 | t.Fatalf("retry across gap: got %d %q, want 200 late-backend", r.code, r.body) |
| 194 | } |
| 195 | case <-time.After(10 * time.Second): |
| 196 | t.Fatal("request never completed; router did not retry across the gap") |
| 197 | } |
| 198 | } |
| 199 | |
| 200 | func TestReloadOnlyServesReady(t *testing.T) { |
| 201 | reg, err := openRegistry(filepath.Join(t.TempDir(), "registry.db")) |
| 202 | if err != nil { |
| 203 | t.Fatal(err) |
| 204 | } |
| 205 | for _, r := range []Route{ |
| 206 | {Host: "ready.example.com", Kind: "instance", Socket: "/run/lchat/a.sock", Status: "ready"}, |
| 207 | {Host: "failed.example.com", Kind: "instance", Socket: "/run/lchat/b.sock", Status: "failed"}, |
| 208 | {Host: "creating.example.com", Kind: "instance", Socket: "/run/lchat/c.sock", Status: "creating"}, |
| 209 | } { |
| 210 | if err := reg.upsert(r); err != nil { |
| 211 | t.Fatal(err) |
| 212 | } |
| 213 | } |
| 214 | rt, err := newRouter(reg, nil) |
| 215 | if err != nil { |
| 216 | t.Fatal(err) |
| 217 | } |
| 218 | if !rt.allowed("ready.example.com") { |
| 219 | t.Error("ready route should be served") |
| 220 | } |
| 221 | if rt.allowed("failed.example.com") { |
| 222 | t.Error("failed route should not be served or cert-eligible") |
| 223 | } |
| 224 | if rt.allowed("creating.example.com") { |
| 225 | t.Error("creating route should not be served") |
| 226 | } |
| 227 | } |
| 228 | |
| 229 | func TestWaitHealthy(t *testing.T) { |
| 230 | serve := func(status int) string { |
| 231 | sock := tmpSock(t) |
| 232 | ln, err := net.Listen("unix", sock) |
| 233 | if err != nil { |
| 234 | t.Fatal(err) |
| 235 | } |
| 236 | srv := &http.Server{Handler: http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) { w.WriteHeader(status) })} |
| 237 | go srv.Serve(ln) |
| 238 | t.Cleanup(func() { srv.Close() }) |
| 239 | return sock |
| 240 | } |
| 241 | if err := waitHealthy(serve(200), 3*time.Second); err != nil { |
| 242 | t.Errorf("200 backend: waitHealthy = %v, want nil", err) |
| 243 | } |
| 244 | if err := waitHealthy(serve(500), 1*time.Second); err == nil { |
| 245 | t.Error("500 backend: waitHealthy = nil, want error (a broken binary must fail the deploy gate)") |
| 246 | } |
| 247 | } |
| 248 | |
| 249 | // proxyGet sends GET base+"/" with an overridden Host header and returns the |
| 250 | // response body + status code. |
| 251 | func proxyGet(t *testing.T, base, host string) (string, int) { |
| 252 | t.Helper() |
| 253 | req, err := http.NewRequest(http.MethodGet, base+"/", nil) |
| 254 | if err != nil { |
| 255 | t.Fatalf("new request: %v", err) |
| 256 | } |
| 257 | req.Host = host |
| 258 | resp, err := http.DefaultClient.Do(req) |
| 259 | if err != nil { |
| 260 | t.Fatalf("request: %v", err) |
| 261 | } |
| 262 | defer resp.Body.Close() |
| 263 | b, _ := io.ReadAll(resp.Body) |
| 264 | return string(b), resp.StatusCode |
| 265 | } |
| 266 | |
| 267 | // tmpSock returns a short unix socket path (the sun_path limit is ~104 bytes, so |
| 268 | // t.TempDir() can be too long on macOS) and schedules its removal. |
| 269 | func tmpSock(t *testing.T) string { |
| 270 | t.Helper() |
| 271 | s := fmt.Sprintf("/tmp/lchat-rt-%d-%d.sock", os.Getpid(), time.Now().UnixNano()%1_000_000) |
| 272 | os.Remove(s) |
| 273 | t.Cleanup(func() { os.Remove(s) }) |
| 274 | return s |
| 275 | } |
| 276 | |
| 277 | func TestRouterUnknownHostFallback(t *testing.T) { |
| 278 | reg, err := openRegistry(filepath.Join(t.TempDir(), "registry.db")) |
| 279 | if err != nil { |
| 280 | t.Fatalf("open registry: %v", err) |
| 281 | } |
| 282 | rt, err := newRouter(reg, nil) |
| 283 | if err != nil { |
| 284 | t.Fatalf("new router: %v", err) |
| 285 | } |
| 286 | rt.fallbackURL = "https://elevenmessenger.com" |
| 287 | front := httptest.NewServer(rt) |
| 288 | t.Cleanup(front.Close) |
| 289 | |
| 290 | // Unknown host → 302 to the fallback, never a bare 404. 302 (not 301) so a |
| 291 | // typo'd host isn't cached as permanently moved. |
| 292 | req, _ := http.NewRequest(http.MethodGet, front.URL+"/some/path", nil) |
| 293 | req.Host = "typo.elevenmessenger.com" |
| 294 | client := &http.Client{CheckRedirect: func(*http.Request, []*http.Request) error { return http.ErrUseLastResponse }} |
| 295 | resp, err := client.Do(req) |
| 296 | if err != nil { |
| 297 | t.Fatalf("request: %v", err) |
| 298 | } |
| 299 | defer resp.Body.Close() |
| 300 | if resp.StatusCode != http.StatusFound { |
| 301 | t.Fatalf("status = %d, want 302", resp.StatusCode) |
| 302 | } |
| 303 | if loc := resp.Header.Get("Location"); loc != "https://elevenmessenger.com" { |
| 304 | t.Fatalf("Location = %q, want the fallback", loc) |
| 305 | } |
| 306 | |
| 307 | // Without a fallback the classic 404 stands (covered again for regressions). |
| 308 | rt.fallbackURL = "" |
| 309 | if _, code := proxyGet(t, front.URL, "typo.elevenmessenger.com"); code != http.StatusNotFound { |
| 310 | t.Fatalf("no fallback: status = %d, want 404", code) |
| 311 | } |
| 312 | } |
| 313 | |
amadan