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 +1,277 @@
+package redisstate
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"strings"
+
+	"galaxy/lobby/internal/domain/application"
+	"galaxy/lobby/internal/domain/common"
+	"galaxy/lobby/internal/ports"
+
+	"github.com/redis/go-redis/v9"
+)
+
+// ApplicationStore provides Redis-backed durable storage for application
+// records.
+type ApplicationStore struct {
+	client *redis.Client
+	keys   Keyspace
+}
+
+// NewApplicationStore constructs one Redis-backed application store. It
+// returns an error when client is nil.
+func NewApplicationStore(client *redis.Client) (*ApplicationStore, error) {
+	if client == nil {
+		return nil, errors.New("new application store: nil redis client")
+	}
+
+	return &ApplicationStore{
+		client: client,
+		keys:   Keyspace{},
+	}, nil
+}
+
+// Save persists a new submitted application record and enforces the
+// single-active (non-rejected) constraint per (applicant, game) pair.
+func (store *ApplicationStore) Save(ctx context.Context, record application.Application) error {
+	if store == nil || store.client == nil {
+		return errors.New("save application: nil store")
+	}
+	if ctx == nil {
+		return errors.New("save application: nil context")
+	}
+	if err := record.Validate(); err != nil {
+		return fmt.Errorf("save application: %w", err)
+	}
+	if record.Status != application.StatusSubmitted {
+		return fmt.Errorf(
+			"save application: status must be %q, got %q",
+			application.StatusSubmitted, record.Status,
+		)
+	}
+
+	payload, err := MarshalApplication(record)
+	if err != nil {
+		return fmt.Errorf("save application: %w", err)
+	}
+
+	primaryKey := store.keys.Application(record.ApplicationID)
+	activeLookupKey := store.keys.UserGameApplication(record.ApplicantUserID, record.GameID)
+	gameIndexKey := store.keys.ApplicationsByGame(record.GameID)
+	userIndexKey := store.keys.ApplicationsByUser(record.ApplicantUserID)
+	member := record.ApplicationID.String()
+
+	watchErr := store.client.Watch(ctx, func(tx *redis.Tx) error {
+		existingPrimary, getErr := tx.Exists(ctx, primaryKey).Result()
+		if getErr != nil {
+			return fmt.Errorf("save application: %w", getErr)
+		}
+		if existingPrimary != 0 {
+			return fmt.Errorf("save application: %w", application.ErrConflict)
+		}
+
+		existingActive, getErr := tx.Exists(ctx, activeLookupKey).Result()
+		if getErr != nil {
+			return fmt.Errorf("save application: %w", getErr)
+		}
+		if existingActive != 0 {
+			return fmt.Errorf("save application: %w", application.ErrConflict)
+		}
+
+		_, err := tx.TxPipelined(ctx, func(pipe redis.Pipeliner) error {
+			pipe.Set(ctx, primaryKey, payload, ApplicationRecordTTL)
+			pipe.Set(ctx, activeLookupKey, member, ApplicationRecordTTL)
+			pipe.SAdd(ctx, gameIndexKey, member)
+			pipe.SAdd(ctx, userIndexKey, member)
+			return nil
+		})
+		return err
+	}, primaryKey, activeLookupKey)
+
+	switch {
+	case errors.Is(watchErr, redis.TxFailedErr):
+		return fmt.Errorf("save application: %w", application.ErrConflict)
+	case watchErr != nil:
+		return watchErr
+	default:
+		return nil
+	}
+}
+
+// Get returns the record identified by applicationID.
+func (store *ApplicationStore) Get(ctx context.Context, applicationID common.ApplicationID) (application.Application, error) {
+	if store == nil || store.client == nil {
+		return application.Application{}, errors.New("get application: nil store")
+	}
+	if ctx == nil {
+		return application.Application{}, errors.New("get application: nil context")
+	}
+	if err := applicationID.Validate(); err != nil {
+		return application.Application{}, fmt.Errorf("get application: %w", err)
+	}
+
+	payload, err := store.client.Get(ctx, store.keys.Application(applicationID)).Bytes()
+	switch {
+	case errors.Is(err, redis.Nil):
+		return application.Application{}, application.ErrNotFound
+	case err != nil:
+		return application.Application{}, fmt.Errorf("get application: %w", err)
+	}
+
+	record, err := UnmarshalApplication(payload)
+	if err != nil {
+		return application.Application{}, fmt.Errorf("get application: %w", err)
+	}
+	return record, nil
+}
+
+// GetByGame returns every application attached to gameID.
+func (store *ApplicationStore) GetByGame(ctx context.Context, gameID common.GameID) ([]application.Application, error) {
+	if store == nil || store.client == nil {
+		return nil, errors.New("get applications by game: nil store")
+	}
+	if ctx == nil {
+		return nil, errors.New("get applications by game: nil context")
+	}
+	if err := gameID.Validate(); err != nil {
+		return nil, fmt.Errorf("get applications by game: %w", err)
+	}
+
+	return store.loadApplicationsBySet(ctx,
+		"get applications by game",
+		store.keys.ApplicationsByGame(gameID),
+	)
+}
+
+// GetByUser returns every application submitted by applicantUserID.
+func (store *ApplicationStore) GetByUser(ctx context.Context, applicantUserID string) ([]application.Application, error) {
+	if store == nil || store.client == nil {
+		return nil, errors.New("get applications by user: nil store")
+	}
+	if ctx == nil {
+		return nil, errors.New("get applications by user: nil context")
+	}
+	trimmed := strings.TrimSpace(applicantUserID)
+	if trimmed == "" {
+		return nil, fmt.Errorf("get applications by user: applicant user id must not be empty")
+	}
+
+	return store.loadApplicationsBySet(ctx,
+		"get applications by user",
+		store.keys.ApplicationsByUser(trimmed),
+	)
+}
+
+// loadApplicationsBySet materializes applications whose ids are stored in
+// setKey. Stale set members (primary key removed out-of-band) are dropped
+// silently, mirroring gamestore.GetByStatus.
+func (store *ApplicationStore) loadApplicationsBySet(ctx context.Context, operation, setKey string) ([]application.Application, 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.Application(common.ApplicationID(member))
+	}
+
+	payloads, err := store.client.MGet(ctx, primaryKeys...).Result()
+	if err != nil {
+		return nil, fmt.Errorf("%s: %w", operation, err)
+	}
+
+	records := make([]application.Application, 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 := UnmarshalApplication([]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 *ApplicationStore) UpdateStatus(ctx context.Context, input ports.UpdateApplicationStatusInput) error {
+	if store == nil || store.client == nil {
+		return errors.New("update application status: nil store")
+	}
+	if ctx == nil {
+		return errors.New("update application status: nil context")
+	}
+	if err := input.Validate(); err != nil {
+		return fmt.Errorf("update application status: %w", err)
+	}
+
+	if err := application.Transition(input.ExpectedFrom, input.To); err != nil {
+		return err
+	}
+
+	primaryKey := store.keys.Application(input.ApplicationID)
+	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 application.ErrNotFound
+		case getErr != nil:
+			return fmt.Errorf("update application status: %w", getErr)
+		}
+
+		existing, err := UnmarshalApplication(payload)
+		if err != nil {
+			return fmt.Errorf("update application status: %w", err)
+		}
+		if existing.Status != input.ExpectedFrom {
+			return fmt.Errorf("update application status: %w", application.ErrConflict)
+		}
+
+		existing.Status = input.To
+		decidedAt := at
+		existing.DecidedAt = &decidedAt
+
+		encoded, err := MarshalApplication(existing)
+		if err != nil {
+			return fmt.Errorf("update application status: %w", err)
+		}
+
+		activeLookupKey := store.keys.UserGameApplication(existing.ApplicantUserID, existing.GameID)
+
+		_, err = tx.TxPipelined(ctx, func(pipe redis.Pipeliner) error {
+			pipe.Set(ctx, primaryKey, encoded, ApplicationRecordTTL)
+			if input.To == application.StatusRejected {
+				pipe.Del(ctx, activeLookupKey)
+			}
+			return nil
+		})
+		return err
+	}, primaryKey)
+
+	switch {
+	case errors.Is(watchErr, redis.TxFailedErr):
+		return fmt.Errorf("update application status: %w", application.ErrConflict)
+	case watchErr != nil:
+		return watchErr
+	default:
+		return nil
+	}
+}
+
+// Ensure ApplicationStore satisfies the ports.ApplicationStore interface
+// at compile time.
+var _ ports.ApplicationStore = (*ApplicationStore)(nil)