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 +1,279 @@
+// Package submitapplication implements the `lobby.application.submit`
+// message type. It validates the request against the public-game
+// enrollment rules, calls UserService for eligibility, checks race name
+// availability through the Race Name Directory, persists the new
+// submitted application via ApplicationStore, and publishes the
+// `lobby.application.submitted` notification intent.
+package submitapplication
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"log/slog"
+	"time"
+
+	"galaxy/lobby/internal/domain/application"
+	"galaxy/lobby/internal/domain/common"
+	"galaxy/lobby/internal/domain/game"
+	"galaxy/lobby/internal/logging"
+	"galaxy/lobby/internal/ports"
+	"galaxy/lobby/internal/service/shared"
+	"galaxy/lobby/internal/telemetry"
+	"galaxy/notificationintent"
+)
+
+// Service executes the public-game application submission use case.
+type Service struct {
+	games        ports.GameStore
+	memberships  ports.MembershipStore
+	applications ports.ApplicationStore
+	users        ports.UserService
+	directory    ports.RaceNameDirectory
+	intents      ports.IntentPublisher
+	ids          ports.IDGenerator
+	clock        func() time.Time
+	logger       *slog.Logger
+	telemetry    *telemetry.Runtime
+}
+
+// Dependencies groups the collaborators used by Service.
+type Dependencies struct {
+	// Games loads the target game record for enrollment validation.
+	Games ports.GameStore
+
+	// Memberships is consulted for the active-member roster count used
+	// to enforce the max_players + start_gap_players capacity guard.
+	Memberships ports.MembershipStore
+
+	// Applications persists the new submitted record.
+	Applications ports.ApplicationStore
+
+	// Users resolves the synchronous eligibility snapshot.
+	Users ports.UserService
+
+	// Directory checks race name availability.
+	Directory ports.RaceNameDirectory
+
+	// Intents publishes the lobby.application.submitted intent.
+	Intents ports.IntentPublisher
+
+	// IDs mints the new opaque application identifier.
+	IDs ports.IDGenerator
+
+	// Clock supplies the wall-clock used for CreatedAt and the
+	// notification's OccurredAt. Defaults to time.Now when nil.
+	Clock func() time.Time
+
+	// Logger records structured service-level events. Defaults to
+	// slog.Default when nil.
+	Logger *slog.Logger
+
+	// Telemetry records the `lobby.application.outcomes` counter on each
+	// successful submission. Optional; nil disables metric emission.
+	Telemetry *telemetry.Runtime
+}
+
+// NewService constructs one Service with deps.
+func NewService(deps Dependencies) (*Service, error) {
+	switch {
+	case deps.Games == nil:
+		return nil, errors.New("new submit application service: nil game store")
+	case deps.Memberships == nil:
+		return nil, errors.New("new submit application service: nil membership store")
+	case deps.Applications == nil:
+		return nil, errors.New("new submit application service: nil application store")
+	case deps.Users == nil:
+		return nil, errors.New("new submit application service: nil user service")
+	case deps.Directory == nil:
+		return nil, errors.New("new submit application service: nil race name directory")
+	case deps.Intents == nil:
+		return nil, errors.New("new submit application service: nil intent publisher")
+	case deps.IDs == nil:
+		return nil, errors.New("new submit application service: nil id generator")
+	}
+	clock := deps.Clock
+	if clock == nil {
+		clock = time.Now
+	}
+	logger := deps.Logger
+	if logger == nil {
+		logger = slog.Default()
+	}
+	return &Service{
+		games:        deps.Games,
+		memberships:  deps.Memberships,
+		applications: deps.Applications,
+		users:        deps.Users,
+		directory:    deps.Directory,
+		intents:      deps.Intents,
+		ids:          deps.IDs,
+		clock:        clock,
+		logger:       logger.With("service", "lobby.submitapplication"),
+		telemetry:    deps.Telemetry,
+	}, nil
+}
+
+// Input stores the arguments required to submit one application.
+type Input struct {
+	// Actor identifies the caller. Must be ActorKindUser.
+	Actor shared.Actor
+
+	// GameID identifies the target game.
+	GameID common.GameID
+
+	// RaceName stores the desired in-game name in original casing.
+	RaceName string
+}
+
+// Handle validates input, authorizes the actor, verifies eligibility and
+// race name availability, persists the new submitted application, and
+// publishes the lobby.application.submitted intent on success.
+func (service *Service) Handle(ctx context.Context, input Input) (application.Application, error) {
+	if service == nil {
+		return application.Application{}, errors.New("submit application: nil service")
+	}
+	if ctx == nil {
+		return application.Application{}, errors.New("submit application: nil context")
+	}
+	if err := input.Actor.Validate(); err != nil {
+		return application.Application{}, fmt.Errorf("submit application: actor: %w", err)
+	}
+	if !input.Actor.IsUser() {
+		return application.Application{}, fmt.Errorf(
+			"%w: only authenticated users may submit applications",
+			shared.ErrForbidden,
+		)
+	}
+	if err := input.GameID.Validate(); err != nil {
+		return application.Application{}, fmt.Errorf("submit application: %w", err)
+	}
+
+	gameRecord, err := service.games.Get(ctx, input.GameID)
+	if err != nil {
+		return application.Application{}, fmt.Errorf("submit application: %w", err)
+	}
+	if gameRecord.GameType != game.GameTypePublic {
+		return application.Application{}, fmt.Errorf(
+			"submit application: game %q is not public: %w",
+			gameRecord.GameID, game.ErrConflict,
+		)
+	}
+	if gameRecord.Status != game.StatusEnrollmentOpen {
+		return application.Application{}, fmt.Errorf(
+			"submit application: game %q is not in enrollment_open: %w",
+			gameRecord.GameID, game.ErrConflict,
+		)
+	}
+
+	eligibility, err := service.users.GetEligibility(ctx, input.Actor.UserID)
+	if err != nil {
+		return application.Application{}, fmt.Errorf(
+			"submit application: %w: %w",
+			shared.ErrServiceUnavailable, err,
+		)
+	}
+	if !eligibility.Exists || !eligibility.CanJoinGame {
+		return application.Application{}, fmt.Errorf(
+			"%w: user is not eligible to join games",
+			shared.ErrEligibilityDenied,
+		)
+	}
+
+	if err := service.checkRosterCapacity(ctx, gameRecord); err != nil {
+		return application.Application{}, err
+	}
+
+	availability, err := service.directory.Check(ctx, input.RaceName, input.Actor.UserID)
+	if err != nil {
+		return application.Application{}, fmt.Errorf("submit application: %w", err)
+	}
+	if availability.Taken {
+		return application.Application{}, fmt.Errorf(
+			"submit application: race name held by another user: %w",
+			ports.ErrNameTaken,
+		)
+	}
+
+	applicationID, err := service.ids.NewApplicationID()
+	if err != nil {
+		return application.Application{}, fmt.Errorf("submit application: %w", err)
+	}
+
+	now := service.clock().UTC()
+	record, err := application.New(application.NewApplicationInput{
+		ApplicationID:   applicationID,
+		GameID:          input.GameID,
+		ApplicantUserID: input.Actor.UserID,
+		RaceName:        input.RaceName,
+		Now:             now,
+	})
+	if err != nil {
+		return application.Application{}, fmt.Errorf("submit application: %w", err)
+	}
+
+	if err := service.applications.Save(ctx, record); err != nil {
+		return application.Application{}, fmt.Errorf("submit application: %w", err)
+	}
+
+	intent, err := notificationintent.NewPublicLobbyApplicationSubmittedIntent(
+		notificationintent.Metadata{
+			IdempotencyKey: "lobby.application.submitted:" + record.ApplicationID.String(),
+			OccurredAt:     now,
+		},
+		notificationintent.LobbyApplicationSubmittedPayload{
+			GameID:          gameRecord.GameID.String(),
+			GameName:        gameRecord.GameName,
+			ApplicantUserID: record.ApplicantUserID,
+			ApplicantName:   record.RaceName,
+		},
+	)
+	if err != nil {
+		// Building the intent failed: this is a programmer error
+		// (mismatched payload contract), not a transport failure.
+		// Log and proceed — the application is already committed.
+		service.logger.ErrorContext(ctx, "build application submitted intent",
+			"application_id", record.ApplicationID.String(),
+			"err", err.Error(),
+		)
+	} else if _, publishErr := service.intents.Publish(ctx, intent); publishErr != nil {
+		// Notification degradation per README §Notification Contracts:
+		// do not roll back business state.
+		service.logger.WarnContext(ctx, "publish application submitted intent",
+			"application_id", record.ApplicationID.String(),
+			"err", publishErr.Error(),
+		)
+	}
+
+	service.telemetry.RecordApplicationOutcome(ctx, "submitted")
+
+	logArgs := []any{
+		"game_id", record.GameID.String(),
+		"game_type", string(gameRecord.GameType),
+		"game_status", string(gameRecord.Status),
+		"application_id", record.ApplicationID.String(),
+		"user_id", record.ApplicantUserID,
+		"race_name", record.RaceName,
+	}
+	logArgs = append(logArgs, logging.ContextAttrs(ctx)...)
+	service.logger.InfoContext(ctx, "application submitted", logArgs...)
+	return record, nil
+}
+
+// checkRosterCapacity counts active memberships for gameRecord and
+// returns game.ErrConflict when the roster has reached the gap-window
+// upper bound (max_players + start_gap_players).
+func (service *Service) checkRosterCapacity(ctx context.Context, gameRecord game.Game) error {
+	cap := gameRecord.MaxPlayers + gameRecord.StartGapPlayers
+	count, err := shared.CountActiveMemberships(ctx, service.memberships, gameRecord.GameID)
+	if err != nil {
+		return fmt.Errorf("submit application: %w", err)
+	}
+	if count >= cap {
+		return fmt.Errorf(
+			"submit application: roster full (%d active >= %d cap): %w",
+			count, cap, game.ErrConflict,
+		)
+	}
+	return nil
+}