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 +1,284 @@
+package redisstate
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"strings"
+
+	"galaxy/lobby/internal/domain/common"
+	"galaxy/lobby/internal/domain/invite"
+	"galaxy/lobby/internal/ports"
+
+	"github.com/redis/go-redis/v9"
+)
+
+// InviteStore provides Redis-backed durable storage for invite records.
+type InviteStore struct {
+	client *redis.Client
+	keys   Keyspace
+}
+
+// NewInviteStore constructs one Redis-backed invite store. It returns an
+// error when client is nil.
+func NewInviteStore(client *redis.Client) (*InviteStore, error) {
+	if client == nil {
+		return nil, errors.New("new invite store: nil redis client")
+	}
+
+	return &InviteStore{
+		client: client,
+		keys:   Keyspace{},
+	}, nil
+}
+
+// Save persists a new created invite record. Save is create-only; a
+// second save against the same invite id returns invite.ErrConflict.
+func (store *InviteStore) Save(ctx context.Context, record invite.Invite) error {
+	if store == nil || store.client == nil {
+		return errors.New("save invite: nil store")
+	}
+	if ctx == nil {
+		return errors.New("save invite: nil context")
+	}
+	if err := record.Validate(); err != nil {
+		return fmt.Errorf("save invite: %w", err)
+	}
+	if record.Status != invite.StatusCreated {
+		return fmt.Errorf(
+			"save invite: status must be %q, got %q",
+			invite.StatusCreated, record.Status,
+		)
+	}
+
+	payload, err := MarshalInvite(record)
+	if err != nil {
+		return fmt.Errorf("save invite: %w", err)
+	}
+
+	primaryKey := store.keys.Invite(record.InviteID)
+	gameIndexKey := store.keys.InvitesByGame(record.GameID)
+	userIndexKey := store.keys.InvitesByUser(record.InviteeUserID)
+	inviterIndexKey := store.keys.InvitesByInviter(record.InviterUserID)
+	member := record.InviteID.String()
+
+	watchErr := store.client.Watch(ctx, func(tx *redis.Tx) error {
+		existing, getErr := tx.Exists(ctx, primaryKey).Result()
+		if getErr != nil {
+			return fmt.Errorf("save invite: %w", getErr)
+		}
+		if existing != 0 {
+			return fmt.Errorf("save invite: %w", invite.ErrConflict)
+		}
+
+		_, err := tx.TxPipelined(ctx, func(pipe redis.Pipeliner) error {
+			pipe.Set(ctx, primaryKey, payload, InviteRecordTTL)
+			pipe.SAdd(ctx, gameIndexKey, member)
+			pipe.SAdd(ctx, userIndexKey, member)
+			pipe.SAdd(ctx, inviterIndexKey, member)
+			return nil
+		})
+		return err
+	}, primaryKey)
+
+	switch {
+	case errors.Is(watchErr, redis.TxFailedErr):
+		return fmt.Errorf("save invite: %w", invite.ErrConflict)
+	case watchErr != nil:
+		return watchErr
+	default:
+		return nil
+	}
+}
+
+// Get returns the record identified by inviteID.
+func (store *InviteStore) Get(ctx context.Context, inviteID common.InviteID) (invite.Invite, error) {
+	if store == nil || store.client == nil {
+		return invite.Invite{}, errors.New("get invite: nil store")
+	}
+	if ctx == nil {
+		return invite.Invite{}, errors.New("get invite: nil context")
+	}
+	if err := inviteID.Validate(); err != nil {
+		return invite.Invite{}, fmt.Errorf("get invite: %w", err)
+	}
+
+	payload, err := store.client.Get(ctx, store.keys.Invite(inviteID)).Bytes()
+	switch {
+	case errors.Is(err, redis.Nil):
+		return invite.Invite{}, invite.ErrNotFound
+	case err != nil:
+		return invite.Invite{}, fmt.Errorf("get invite: %w", err)
+	}
+
+	record, err := UnmarshalInvite(payload)
+	if err != nil {
+		return invite.Invite{}, fmt.Errorf("get invite: %w", err)
+	}
+	return record, nil
+}
+
+// GetByGame returns every invite attached to gameID.
+func (store *InviteStore) GetByGame(ctx context.Context, gameID common.GameID) ([]invite.Invite, error) {
+	if store == nil || store.client == nil {
+		return nil, errors.New("get invites by game: nil store")
+	}
+	if ctx == nil {
+		return nil, errors.New("get invites by game: nil context")
+	}
+	if err := gameID.Validate(); err != nil {
+		return nil, fmt.Errorf("get invites by game: %w", err)
+	}
+
+	return store.loadInvitesBySet(ctx,
+		"get invites by game",
+		store.keys.InvitesByGame(gameID),
+	)
+}
+
+// GetByUser returns every invite addressed to inviteeUserID.
+func (store *InviteStore) GetByUser(ctx context.Context, inviteeUserID string) ([]invite.Invite, error) {
+	if store == nil || store.client == nil {
+		return nil, errors.New("get invites by user: nil store")
+	}
+	if ctx == nil {
+		return nil, errors.New("get invites by user: nil context")
+	}
+	trimmed := strings.TrimSpace(inviteeUserID)
+	if trimmed == "" {
+		return nil, fmt.Errorf("get invites by user: invitee user id must not be empty")
+	}
+
+	return store.loadInvitesBySet(ctx,
+		"get invites by user",
+		store.keys.InvitesByUser(trimmed),
+	)
+}
+
+// GetByInviter returns every invite created by inviterUserID.
+func (store *InviteStore) GetByInviter(ctx context.Context, inviterUserID string) ([]invite.Invite, error) {
+	if store == nil || store.client == nil {
+		return nil, errors.New("get invites by inviter: nil store")
+	}
+	if ctx == nil {
+		return nil, errors.New("get invites by inviter: nil context")
+	}
+	trimmed := strings.TrimSpace(inviterUserID)
+	if trimmed == "" {
+		return nil, fmt.Errorf("get invites by inviter: inviter user id must not be empty")
+	}
+
+	return store.loadInvitesBySet(ctx,
+		"get invites by inviter",
+		store.keys.InvitesByInviter(trimmed),
+	)
+}
+
+// loadInvitesBySet materializes invites whose ids are stored in setKey.
+// Stale set members (primary key removed out-of-band) are dropped silently.
+func (store *InviteStore) loadInvitesBySet(ctx context.Context, operation, setKey string) ([]invite.Invite, error) {
+	members, err := store.client.SMembers(ctx, setKey).Result()
+	if err != nil {
+		return nil, fmt.Errorf("%s: %w", operation, err)
+	}
+	if len(members) == 0 {
+		return nil, nil
+	}
+
+	primaryKeys := make([]string, len(members))
+	for index, member := range members {
+		primaryKeys[index] = store.keys.Invite(common.InviteID(member))
+	}
+
+	payloads, err := store.client.MGet(ctx, primaryKeys...).Result()
+	if err != nil {
+		return nil, fmt.Errorf("%s: %w", operation, err)
+	}
+
+	records := make([]invite.Invite, 0, len(payloads))
+	for _, entry := range payloads {
+		if entry == nil {
+			continue
+		}
+		raw, ok := entry.(string)
+		if !ok {
+			return nil, fmt.Errorf("%s: unexpected payload type %T", operation, entry)
+		}
+		record, err := UnmarshalInvite([]byte(raw))
+		if err != nil {
+			return nil, fmt.Errorf("%s: %w", operation, err)
+		}
+		records = append(records, record)
+	}
+
+	return records, nil
+}
+
+// UpdateStatus applies one status transition in a compare-and-swap fashion.
+func (store *InviteStore) UpdateStatus(ctx context.Context, input ports.UpdateInviteStatusInput) error {
+	if store == nil || store.client == nil {
+		return errors.New("update invite status: nil store")
+	}
+	if ctx == nil {
+		return errors.New("update invite status: nil context")
+	}
+	if err := input.Validate(); err != nil {
+		return fmt.Errorf("update invite status: %w", err)
+	}
+
+	if err := invite.Transition(input.ExpectedFrom, input.To); err != nil {
+		return err
+	}
+
+	primaryKey := store.keys.Invite(input.InviteID)
+	at := input.At.UTC()
+
+	watchErr := store.client.Watch(ctx, func(tx *redis.Tx) error {
+		payload, getErr := tx.Get(ctx, primaryKey).Bytes()
+		switch {
+		case errors.Is(getErr, redis.Nil):
+			return invite.ErrNotFound
+		case getErr != nil:
+			return fmt.Errorf("update invite status: %w", getErr)
+		}
+
+		existing, err := UnmarshalInvite(payload)
+		if err != nil {
+			return fmt.Errorf("update invite status: %w", err)
+		}
+		if existing.Status != input.ExpectedFrom {
+			return fmt.Errorf("update invite status: %w", invite.ErrConflict)
+		}
+
+		existing.Status = input.To
+		decidedAt := at
+		existing.DecidedAt = &decidedAt
+		if input.To == invite.StatusRedeemed {
+			existing.RaceName = strings.TrimSpace(input.RaceName)
+		}
+
+		encoded, err := MarshalInvite(existing)
+		if err != nil {
+			return fmt.Errorf("update invite status: %w", err)
+		}
+
+		_, err = tx.TxPipelined(ctx, func(pipe redis.Pipeliner) error {
+			pipe.Set(ctx, primaryKey, encoded, InviteRecordTTL)
+			return nil
+		})
+		return err
+	}, primaryKey)
+
+	switch {
+	case errors.Is(watchErr, redis.TxFailedErr):
+		return fmt.Errorf("update invite status: %w", invite.ErrConflict)
+	case watchErr != nil:
+		return watchErr
+	default:
+		return nil
+	}
+}
+
+// Ensure InviteStore satisfies the ports.InviteStore interface at
+// compile time.
+var _ ports.InviteStore = (*InviteStore)(nil)