alt/services/api/internal/socket/server_test.go

package socket

import (
	"context"
	"net"
	"testing"
	"time"

	altv1 "git.toki-labs.com/toki/alt/packages/contracts/gen/go/alt/v1"
	"git.toki-labs.com/toki/alt/services/api/internal/config"
	apiContracts "git.toki-labs.com/toki/alt/services/api/internal/contracts"
	protoSocket "git.toki-labs.com/toki/proto-socket/go"
)

func TestServerRespondsToHelloRequest(t *testing.T) {
	ctx, cancel := context.WithCancel(context.Background())
	defer cancel()

	cfg := config.Config{
		Host:                 "127.0.0.1",
		Port:                 freeTCPPort(t),
		SocketPath:           "/socket",
		HeartbeatIntervalSec: 0,
		HeartbeatWaitSec:     0,
	}
	server := NewServer(cfg)
	if err := server.Start(ctx); err != nil {
		t.Fatalf("failed to start server: %v", err)
	}
	defer server.Stop()

	client, err := protoSocket.DialWsWithHeartbeat(ctx, cfg.Host, cfg.Port, cfg.SocketPath, 0, 0, apiContracts.ParserMap())
	if err != nil {
		t.Fatalf("failed to dial server: %v", err)
	}
	defer client.Close()

	res, err := protoSocket.SendRequestTyped[*altv1.HelloRequest, *altv1.HelloResponse](
		&client.Communicator,
		&altv1.HelloRequest{
			ClientName:         "alt-test",
			ClientVersion:      "test",
			AltProtocolVersion: "alt.v1",
		},
		2*time.Second,
	)
	if err != nil {
		t.Fatalf("failed to send hello request: %v", err)
	}

	if res.GetServerName() != serverName {
		t.Errorf("server name mismatch: expected %q, got %q", serverName, res.GetServerName())
	}
	if res.GetServerVersion() != serverVersion {
		t.Errorf("server version mismatch: expected %q, got %q", serverVersion, res.GetServerVersion())
	}
	if res.GetAltProtocolVersion() != "alt.v1" {
		t.Errorf("protocol version mismatch: expected %q, got %q", "alt.v1", res.GetAltProtocolVersion())
	}
	if len(res.GetCapabilities()) == 0 {
		t.Fatal("expected capabilities to be set")
	}
}

func TestSessionHandlersHaveUniqueRequestTypes(t *testing.T) {
	seen := make(map[string]int)
	for _, handler := range sessionHandlers() {
		if handler.requestType == "" {
			t.Errorf("session handler has empty request type")
			continue
		}
		seen[handler.requestType]++
	}

	for requestType, count := range seen {
		if count > 1 {
			t.Errorf("request type %q registered %d times; duplicate handlers would panic the communicator", requestType, count)
		}
	}
}

func TestSessionHandlersCoverRequiredRequests(t *testing.T) {
	registered := make(map[string]bool)
	for _, handler := range sessionHandlers() {
		registered[handler.requestType] = true
	}

	required := []string{
		protoSocket.TypeNameOf(&altv1.HelloRequest{}),
	}
	for _, requestType := range required {
		if !registered[requestType] {
			t.Errorf("required handler for %q is not registered", requestType)
		}
	}
}

func TestRegisterSessionHandlersSkipsNilRegistrar(t *testing.T) {
	// registerSessionHandlers must tolerate a malformed registry entry instead
	// of panicking during connection setup.
	defer func() {
		if r := recover(); r != nil {
			t.Fatalf("registerSessionHandlers panicked on nil registrar: %v", r)
		}
	}()

	handler := sessionHandler{requestType: "alt.v1.NilRegistrarProbe", register: nil}
	if handler.register != nil {
		t.Fatal("expected nil registrar for probe handler")
	}
	registerSessionHandlers(nil)
}

func freeTCPPort(t *testing.T) int {
	t.Helper()

	listener, err := net.Listen("tcp", "127.0.0.1:0")
	if err != nil {
		t.Fatalf("failed to reserve TCP port: %v", err)
	}
	defer listener.Close()

	addr, ok := listener.Addr().(*net.TCPAddr)
	if !ok {
		t.Fatalf("unexpected listener address type %T", listener.Addr())
	}
	return addr.Port
}