feat: game lobby service

2026-04-25 23:20:55 +02:00
parent 32dc29359a
commit 48b0056b49
336 changed files with 57074 additions and 1418 deletions
@@ -0,0 +1,367 @@
+// Package internalhttp provides the trusted internal HTTP listener used by
+// the runnable Game Lobby Service process. In the runnable
+// skeleton it exposes only the platform liveness and readiness probes;
+// later stages add Game Master registration and admin routes.
+package internalhttp
+
+import (
+	"context"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"log/slog"
+	"net"
+	"net/http"
+	"strconv"
+	"sync"
+	"time"
+
+	"galaxy/lobby/internal/api/httpcommon"
+	"galaxy/lobby/internal/service/approveapplication"
+	"galaxy/lobby/internal/service/blockmember"
+	"galaxy/lobby/internal/service/cancelgame"
+	"galaxy/lobby/internal/service/creategame"
+	"galaxy/lobby/internal/service/getgame"
+	"galaxy/lobby/internal/service/listgames"
+	"galaxy/lobby/internal/service/listmemberships"
+	"galaxy/lobby/internal/service/manualreadytostart"
+	"galaxy/lobby/internal/service/openenrollment"
+	"galaxy/lobby/internal/service/pausegame"
+	"galaxy/lobby/internal/service/rejectapplication"
+	"galaxy/lobby/internal/service/removemember"
+	"galaxy/lobby/internal/service/resumegame"
+	"galaxy/lobby/internal/service/retrystartgame"
+	"galaxy/lobby/internal/service/startgame"
+	"galaxy/lobby/internal/service/updategame"
+	"galaxy/lobby/internal/telemetry"
+
+	"go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp"
+	"go.opentelemetry.io/otel/attribute"
+)
+
+const jsonContentType = "application/json; charset=utf-8"
+
+const (
+	// HealthzPath is the internal liveness probe route.
+	HealthzPath = "/healthz"
+
+	// ReadyzPath is the internal readiness probe route.
+	ReadyzPath = "/readyz"
+)
+
+// Config describes the trusted internal HTTP listener owned by
+// Game Lobby Service.
+type Config struct {
+	// Addr is the TCP listen address used by the internal HTTP server.
+	Addr string
+
+	// ReadHeaderTimeout bounds how long the listener may spend reading request
+	// headers before the server rejects the connection.
+	ReadHeaderTimeout time.Duration
+
+	// ReadTimeout bounds how long the listener may spend reading one request.
+	ReadTimeout time.Duration
+
+	// IdleTimeout bounds how long the listener keeps an idle keep-alive
+	// connection open.
+	IdleTimeout time.Duration
+}
+
+// Validate reports whether cfg contains a usable internal HTTP listener
+// configuration.
+func (cfg Config) Validate() error {
+	switch {
+	case cfg.Addr == "":
+		return errors.New("internal HTTP addr must not be empty")
+	case cfg.ReadHeaderTimeout <= 0:
+		return errors.New("internal HTTP read header timeout must be positive")
+	case cfg.ReadTimeout <= 0:
+		return errors.New("internal HTTP read timeout must be positive")
+	case cfg.IdleTimeout <= 0:
+		return errors.New("internal HTTP idle timeout must be positive")
+	default:
+		return nil
+	}
+}
+
+// Dependencies describes the collaborators used by the internal HTTP
+// transport layer.
+type Dependencies struct {
+	// Logger writes structured listener lifecycle logs. When nil,
+	// slog.Default is used.
+	Logger *slog.Logger
+
+	// Telemetry records low-cardinality probe metrics and lifecycle events.
+	Telemetry *telemetry.Runtime
+
+	// CreateGame handles admin-initiated `lobby.game.create` calls routed
+	// through Admin Service. A nil value makes the corresponding route
+	// return `internal_error`; tests that do not exercise the route may
+	// leave it nil.
+	CreateGame *creategame.Service
+
+	// UpdateGame handles admin-initiated `lobby.game.update` calls.
+	UpdateGame *updategame.Service
+
+	// OpenEnrollment handles admin-initiated `lobby.game.open_enrollment`
+	// calls.
+	OpenEnrollment *openenrollment.Service
+
+	// CancelGame handles admin-initiated `lobby.game.cancel` calls.
+	CancelGame *cancelgame.Service
+
+	// ManualReadyToStart handles admin-initiated
+	// `lobby.game.ready_to_start` calls.
+	ManualReadyToStart *manualreadytostart.Service
+
+	// StartGame handles admin-initiated `lobby.game.start` calls
+	//.
+	StartGame *startgame.Service
+
+	// RetryStartGame handles admin-initiated `lobby.game.retry_start`
+	// calls.
+	RetryStartGame *retrystartgame.Service
+
+	// PauseGame handles admin-initiated `lobby.game.pause` calls
+	//.
+	PauseGame *pausegame.Service
+
+	// ResumeGame handles admin-initiated `lobby.game.resume` calls
+	//.
+	ResumeGame *resumegame.Service
+
+	// ApproveApplication handles admin-initiated
+	// `lobby.application.approve` calls. Wired on the internal port for
+	// Admin Service routing.
+	ApproveApplication *approveapplication.Service
+
+	// RejectApplication handles admin-initiated
+	// `lobby.application.reject` calls.
+	RejectApplication *rejectapplication.Service
+
+	// RemoveMember handles admin-initiated `lobby.membership.remove`
+	// calls.
+	RemoveMember *removemember.Service
+
+	// BlockMember handles admin-initiated `lobby.membership.block`
+	// calls.
+	BlockMember *blockmember.Service
+
+	// GetGame handles `internalGetGame` and `adminGetGame` reads
+	//. The handler always passes shared.NewAdminActor() so
+	// the response is unrestricted by visibility rules.
+	GetGame *getgame.Service
+
+	// ListGames handles `adminListGames`. The handler
+	// always passes shared.NewAdminActor() so every status is included.
+	ListGames *listgames.Service
+
+	// ListMemberships handles `internalListMemberships` and
+	// `adminListMemberships` reads. The handler always
+	// passes shared.NewAdminActor() so every membership is returned.
+	ListMemberships *listmemberships.Service
+}
+
+// Server owns the trusted internal HTTP listener exposed by
+// Game Lobby Service.
+type Server struct {
+	cfg Config
+
+	handler http.Handler
+	logger  *slog.Logger
+	metrics *telemetry.Runtime
+
+	stateMu  sync.RWMutex
+	server   *http.Server
+	listener net.Listener
+}
+
+// NewServer constructs one trusted internal HTTP server for cfg and deps.
+func NewServer(cfg Config, deps Dependencies) (*Server, error) {
+	if err := cfg.Validate(); err != nil {
+		return nil, fmt.Errorf("new internal HTTP server: %w", err)
+	}
+
+	logger := deps.Logger
+	if logger == nil {
+		logger = slog.Default()
+	}
+
+	return &Server{
+		cfg:     cfg,
+		handler: newHandler(deps, logger),
+		logger:  logger.With("component", "internal_http"),
+		metrics: deps.Telemetry,
+	}, nil
+}
+
+// Addr returns the currently bound listener address after Run is called. It
+// returns an empty string if the server has not yet bound a listener.
+func (server *Server) Addr() string {
+	server.stateMu.RLock()
+	defer server.stateMu.RUnlock()
+	if server.listener == nil {
+		return ""
+	}
+
+	return server.listener.Addr().String()
+}
+
+// Run binds the configured listener and serves the internal HTTP surface
+// until Shutdown closes the server.
+func (server *Server) Run(ctx context.Context) error {
+	if ctx == nil {
+		return errors.New("run internal HTTP server: nil context")
+	}
+	if err := ctx.Err(); err != nil {
+		return err
+	}
+
+	listener, err := net.Listen("tcp", server.cfg.Addr)
+	if err != nil {
+		return fmt.Errorf("run internal HTTP server: listen on %q: %w", server.cfg.Addr, err)
+	}
+
+	httpServer := &http.Server{
+		Handler:           server.handler,
+		ReadHeaderTimeout: server.cfg.ReadHeaderTimeout,
+		ReadTimeout:       server.cfg.ReadTimeout,
+		IdleTimeout:       server.cfg.IdleTimeout,
+	}
+
+	server.stateMu.Lock()
+	server.server = httpServer
+	server.listener = listener
+	server.stateMu.Unlock()
+
+	server.logger.Info("internal HTTP server started", "addr", listener.Addr().String())
+
+	defer func() {
+		server.stateMu.Lock()
+		server.server = nil
+		server.listener = nil
+		server.stateMu.Unlock()
+	}()
+
+	err = httpServer.Serve(listener)
+	switch {
+	case err == nil:
+		return nil
+	case errors.Is(err, http.ErrServerClosed):
+		server.logger.Info("internal HTTP server stopped")
+		return nil
+	default:
+		return fmt.Errorf("run internal HTTP server: serve on %q: %w", server.cfg.Addr, err)
+	}
+}
+
+// Shutdown gracefully stops the internal HTTP server within ctx.
+func (server *Server) Shutdown(ctx context.Context) error {
+	if ctx == nil {
+		return errors.New("shutdown internal HTTP server: nil context")
+	}
+
+	server.stateMu.RLock()
+	httpServer := server.server
+	server.stateMu.RUnlock()
+
+	if httpServer == nil {
+		return nil
+	}
+
+	if err := httpServer.Shutdown(ctx); err != nil && !errors.Is(err, http.ErrServerClosed) {
+		return fmt.Errorf("shutdown internal HTTP server: %w", err)
+	}
+
+	return nil
+}
+
+func newHandler(deps Dependencies, logger *slog.Logger) http.Handler {
+	if logger == nil {
+		logger = slog.Default()
+	}
+	mux := http.NewServeMux()
+	mux.HandleFunc("GET "+HealthzPath, handleHealthz)
+	mux.HandleFunc("GET "+ReadyzPath, handleReadyz)
+	registerGameRoutes(mux, deps, logger)
+	registerApplicationRoutes(mux, deps, logger)
+	registerReadyToStartRoutes(mux, deps, logger)
+	registerStartRoutes(mux, deps, logger)
+	registerPauseResumeRoutes(mux, deps, logger)
+	registerMembershipRoutes(mux, deps, logger)
+
+	metrics := deps.Telemetry
+	options := []otelhttp.Option{}
+	if metrics != nil {
+		options = append(options,
+			otelhttp.WithTracerProvider(metrics.TracerProvider()),
+			otelhttp.WithMeterProvider(metrics.MeterProvider()),
+		)
+	}
+
+	observable := otelhttp.NewHandler(withObservability(mux, metrics), "lobby.internal_http", options...)
+	return httpcommon.RequestID(observable)
+}
+
+func withObservability(next http.Handler, metrics *telemetry.Runtime) http.Handler {
+	return http.HandlerFunc(func(writer http.ResponseWriter, request *http.Request) {
+		startedAt := time.Now()
+		recorder := &statusRecorder{
+			ResponseWriter: writer,
+			statusCode:     http.StatusOK,
+		}
+
+		next.ServeHTTP(recorder, request)
+
+		route := request.Pattern
+		switch recorder.statusCode {
+		case http.StatusMethodNotAllowed:
+			route = "method_not_allowed"
+		case http.StatusNotFound:
+			route = "not_found"
+		case 0:
+			route = "unmatched"
+		}
+		if route == "" {
+			route = "unmatched"
+		}
+
+		metrics.RecordInternalHTTPRequest(
+			request.Context(),
+			[]attribute.KeyValue{
+				attribute.String("route", route),
+				attribute.String("method", request.Method),
+				attribute.String("status_code", strconv.Itoa(recorder.statusCode)),
+			},
+			time.Since(startedAt),
+		)
+	})
+}
+
+func handleHealthz(writer http.ResponseWriter, _ *http.Request) {
+	writeStatusResponse(writer, http.StatusOK, "ok")
+}
+
+func handleReadyz(writer http.ResponseWriter, _ *http.Request) {
+	writeStatusResponse(writer, http.StatusOK, "ready")
+}
+
+func writeStatusResponse(writer http.ResponseWriter, statusCode int, status string) {
+	writer.Header().Set("Content-Type", jsonContentType)
+	writer.WriteHeader(statusCode)
+	_ = json.NewEncoder(writer).Encode(statusResponse{Status: status})
+}
+
+type statusResponse struct {
+	Status string `json:"status"`
+}
+
+type statusRecorder struct {
+	http.ResponseWriter
+	statusCode int
+}
+
+func (recorder *statusRecorder) WriteHeader(statusCode int) {
+	recorder.statusCode = statusCode
+	recorder.ResponseWriter.WriteHeader(statusCode)
+}