| 1 | package host |
| 2 | |
| 3 | import ( |
| 4 | "fmt" |
| 5 | "net/http" |
| 6 | "net/http/httptest" |
| 7 | "testing" |
| 8 | "time" |
| 9 | ) |
| 10 | |
| 11 | // The dial/serve/handshake tests for this channel live in |
| 12 | // internal/tunnelclient, where that code now lives. What is testable HERE is |
| 13 | // the agent's wrapper: the env convention, and the state transitions the |
| 14 | // status heartbeat reads off tunnelState(). |
| 15 | |
| 16 | // TestTunnelLoopStateTransitions drives tunnelLoop against a fake edge that |
| 17 | // hijacks, answers 101, then holds the raw conn open until the test releases |
| 18 | // it — enough to observe tunnelState() go "" -> "connected", and then |
| 19 | // "connected" -> "reconnecting" once the conn is torn down. This is the state |
| 20 | // Task 6's heartbeat probe reads, so its transitions are worth asserting |
| 21 | // through the wrapper that publishes them, not only in the package that |
| 22 | // reports them. |
| 23 | func TestTunnelLoopStateTransitions(t *testing.T) { |
| 24 | release := make(chan struct{}) |
| 25 | srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { |
| 26 | conn, bufrw, err := w.(http.Hijacker).Hijack() |
| 27 | if err != nil { |
| 28 | t.Errorf("hijack: %v", err) |
| 29 | return |
| 30 | } |
| 31 | fmt.Fprintf(bufrw, "HTTP/1.1 101 Switching Protocols\r\nUpgrade: carlos-tunnel/1\r\nConnection: Upgrade\r\n\r\n") |
| 32 | bufrw.Flush() |
| 33 | <-release |
| 34 | conn.Close() |
| 35 | })) |
| 36 | defer srv.Close() |
| 37 | |
| 38 | t.Setenv("CARLOS_TUNNEL_URL", srv.URL) |
| 39 | t.Setenv("CARLOS_TUNNEL_TOKEN", "sekrit") |
| 40 | t.Setenv("CARLOS_TUNNEL_NAME", "pi-box") |
| 41 | |
| 42 | // tunnelLoop never returns while configured (by design — it retries |
| 43 | // forever on context.Background()), so this goroutine outlives the test; |
| 44 | // the fake edge is torn down via defer, and any further redial attempts |
| 45 | // just fail fast against a closed listener. |
| 46 | go tunnelLoop(http.NewServeMux()) |
| 47 | |
| 48 | waitForTunnelState(t, "connected") |
| 49 | |
| 50 | close(release) |
| 51 | |
| 52 | waitForTunnelState(t, "reconnecting") |
| 53 | } |
| 54 | |
| 55 | // TestTunnelLoopInertUnlessFullyConfigured checks the documented convention: |
| 56 | // tunnelLoop must return immediately — never dial, never block — unless all |
| 57 | // three of CARLOS_TUNNEL_URL/_TOKEN/_NAME are set. |
| 58 | func TestTunnelLoopInertUnlessFullyConfigured(t *testing.T) { |
| 59 | cases := []struct { |
| 60 | name, url, token, tname string |
| 61 | }{ |
| 62 | {"all unset", "", "", ""}, |
| 63 | {"url only", "http://tunnel.invalid", "", ""}, |
| 64 | {"token only", "", "tok", ""}, |
| 65 | {"name only", "", "", "pi-box"}, |
| 66 | {"url and token", "http://tunnel.invalid", "tok", ""}, |
| 67 | {"url and name", "http://tunnel.invalid", "", "pi-box"}, |
| 68 | {"token and name", "", "tok", "pi-box"}, |
| 69 | } |
| 70 | for _, c := range cases { |
| 71 | t.Run(c.name, func(t *testing.T) { |
| 72 | t.Setenv("CARLOS_TUNNEL_URL", c.url) |
| 73 | t.Setenv("CARLOS_TUNNEL_TOKEN", c.token) |
| 74 | t.Setenv("CARLOS_TUNNEL_NAME", c.tname) |
| 75 | |
| 76 | done := make(chan struct{}) |
| 77 | go func() { |
| 78 | tunnelLoop(http.NewServeMux()) |
| 79 | close(done) |
| 80 | }() |
| 81 | select { |
| 82 | case <-done: |
| 83 | case <-time.After(500 * time.Millisecond): |
| 84 | t.Fatal("tunnelLoop did not return promptly with an incomplete env config") |
| 85 | } |
| 86 | }) |
| 87 | } |
| 88 | } |
| 89 | |
| 90 | func waitForTunnelState(t *testing.T, want string) { |
| 91 | t.Helper() |
| 92 | deadline := time.Now().Add(2 * time.Second) |
| 93 | for time.Now().Before(deadline) { |
| 94 | if tunnelState() == want { |
| 95 | return |
| 96 | } |
| 97 | time.Sleep(5 * time.Millisecond) |
| 98 | } |
| 99 | t.Fatalf("tunnelState() = %q, want %q before deadline", tunnelState(), want) |
| 100 | } |
| 101 | |
amadan