feat: use postgres

2026-04-26 20:34:39 +02:00
parent 48b0056b49
commit fe829285a6
365 changed files with 29223 additions and 24049 deletions
@@ -0,0 +1,310 @@
+// Package applicationstore implements the PostgreSQL-backed adapter for
+// `ports.ApplicationStore`.
+//
+// PG_PLAN.md §6A migrates Game Lobby Service away from Redis-backed durable
+// application records; see `galaxy/lobby/docs/postgres-migration.md` for
+// the full decision record.
+package applicationstore
+
+import (
+	"context"
+	"database/sql"
+	"errors"
+	"fmt"
+	"strings"
+	"time"
+
+	"galaxy/lobby/internal/adapters/postgres/internal/sqlx"
+	pgtable "galaxy/lobby/internal/adapters/postgres/jet/lobby/table"
+	"galaxy/lobby/internal/domain/application"
+	"galaxy/lobby/internal/domain/common"
+	"galaxy/lobby/internal/ports"
+
+	pg "github.com/go-jet/jet/v2/postgres"
+)
+
+// Config configures one PostgreSQL-backed application store instance.
+type Config struct {
+	// DB stores the connection pool the store uses for every query.
+	DB *sql.DB
+
+	// OperationTimeout bounds one round trip.
+	OperationTimeout time.Duration
+}
+
+// Store persists Game Lobby application records in PostgreSQL.
+type Store struct {
+	db               *sql.DB
+	operationTimeout time.Duration
+}
+
+// New constructs one PostgreSQL-backed application store from cfg.
+func New(cfg Config) (*Store, error) {
+	if cfg.DB == nil {
+		return nil, errors.New("new postgres application store: db must not be nil")
+	}
+	if cfg.OperationTimeout <= 0 {
+		return nil, errors.New("new postgres application store: operation timeout must be positive")
+	}
+	return &Store{
+		db:               cfg.DB,
+		operationTimeout: cfg.OperationTimeout,
+	}, nil
+}
+
+// applicationSelectColumns is the canonical SELECT list for the applications
+// table, matching scanApplication's column order.
+var applicationSelectColumns = pg.ColumnList{
+	pgtable.Applications.ApplicationID,
+	pgtable.Applications.GameID,
+	pgtable.Applications.ApplicantUserID,
+	pgtable.Applications.RaceName,
+	pgtable.Applications.Status,
+	pgtable.Applications.CreatedAt,
+	pgtable.Applications.DecidedAt,
+}
+
+// Save persists a new submitted application record. The single-active
+// constraint is enforced by the partial unique index
+// `applications_active_per_user_game_uidx`.
+func (store *Store) Save(ctx context.Context, record application.Application) error {
+	if store == nil || store.db == nil {
+		return errors.New("save application: nil store")
+	}
+	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,
+		)
+	}
+
+	operationCtx, cancel, err := sqlx.WithTimeout(ctx, "save application", store.operationTimeout)
+	if err != nil {
+		return err
+	}
+	defer cancel()
+
+	stmt := pgtable.Applications.INSERT(
+		pgtable.Applications.ApplicationID,
+		pgtable.Applications.GameID,
+		pgtable.Applications.ApplicantUserID,
+		pgtable.Applications.RaceName,
+		pgtable.Applications.Status,
+		pgtable.Applications.CreatedAt,
+		pgtable.Applications.DecidedAt,
+	).VALUES(
+		record.ApplicationID.String(),
+		record.GameID.String(),
+		record.ApplicantUserID,
+		record.RaceName,
+		string(record.Status),
+		record.CreatedAt.UTC(),
+		sqlx.NullableTimePtr(record.DecidedAt),
+	)
+
+	query, args := stmt.Sql()
+	if _, err := store.db.ExecContext(operationCtx, query, args...); err != nil {
+		if sqlx.IsUniqueViolation(err) {
+			return fmt.Errorf("save application: %w", application.ErrConflict)
+		}
+		return fmt.Errorf("save application: %w", err)
+	}
+	return nil
+}
+
+// Get returns the record identified by applicationID. It returns
+// application.ErrNotFound when no record exists.
+func (store *Store) Get(ctx context.Context, applicationID common.ApplicationID) (application.Application, error) {
+	if store == nil || store.db == nil {
+		return application.Application{}, errors.New("get application: nil store")
+	}
+	if err := applicationID.Validate(); err != nil {
+		return application.Application{}, fmt.Errorf("get application: %w", err)
+	}
+
+	operationCtx, cancel, err := sqlx.WithTimeout(ctx, "get application", store.operationTimeout)
+	if err != nil {
+		return application.Application{}, err
+	}
+	defer cancel()
+
+	stmt := pg.SELECT(applicationSelectColumns).
+		FROM(pgtable.Applications).
+		WHERE(pgtable.Applications.ApplicationID.EQ(pg.String(applicationID.String())))
+
+	query, args := stmt.Sql()
+	row := store.db.QueryRowContext(operationCtx, query, args...)
+	record, err := scanApplication(row)
+	if sqlx.IsNoRows(err) {
+		return application.Application{}, application.ErrNotFound
+	}
+	if err != nil {
+		return application.Application{}, fmt.Errorf("get application: %w", err)
+	}
+	return record, nil
+}
+
+// GetByGame returns every application attached to gameID. Sorted by
+// created_at ASC then application_id ASC.
+func (store *Store) GetByGame(ctx context.Context, gameID common.GameID) ([]application.Application, error) {
+	if store == nil || store.db == nil {
+		return nil, errors.New("get applications by game: nil store")
+	}
+	if err := gameID.Validate(); err != nil {
+		return nil, fmt.Errorf("get applications by game: %w", err)
+	}
+
+	stmt := pg.SELECT(applicationSelectColumns).
+		FROM(pgtable.Applications).
+		WHERE(pgtable.Applications.GameID.EQ(pg.String(gameID.String()))).
+		ORDER_BY(pgtable.Applications.CreatedAt.ASC(), pgtable.Applications.ApplicationID.ASC())
+
+	return store.queryList(ctx, "get applications by game", stmt)
+}
+
+// GetByUser returns every application submitted by applicantUserID.
+func (store *Store) GetByUser(ctx context.Context, applicantUserID string) ([]application.Application, error) {
+	if store == nil || store.db == nil {
+		return nil, errors.New("get applications by user: nil store")
+	}
+	trimmed := strings.TrimSpace(applicantUserID)
+	if trimmed == "" {
+		return nil, fmt.Errorf("get applications by user: applicant user id must not be empty")
+	}
+
+	stmt := pg.SELECT(applicationSelectColumns).
+		FROM(pgtable.Applications).
+		WHERE(pgtable.Applications.ApplicantUserID.EQ(pg.String(trimmed))).
+		ORDER_BY(pgtable.Applications.CreatedAt.ASC(), pgtable.Applications.ApplicationID.ASC())
+
+	return store.queryList(ctx, "get applications by user", stmt)
+}
+
+func (store *Store) queryList(ctx context.Context, operation string, stmt pg.SelectStatement) ([]application.Application, error) {
+	operationCtx, cancel, err := sqlx.WithTimeout(ctx, operation, store.operationTimeout)
+	if err != nil {
+		return nil, err
+	}
+	defer cancel()
+
+	query, args := stmt.Sql()
+	rows, err := store.db.QueryContext(operationCtx, query, args...)
+	if err != nil {
+		return nil, fmt.Errorf("%s: %w", operation, err)
+	}
+	defer rows.Close()
+
+	records := make([]application.Application, 0)
+	for rows.Next() {
+		record, err := scanApplication(rows)
+		if err != nil {
+			return nil, fmt.Errorf("%s: scan: %w", operation, err)
+		}
+		records = append(records, record)
+	}
+	if err := rows.Err(); err != nil {
+		return nil, fmt.Errorf("%s: %w", operation, err)
+	}
+	if len(records) == 0 {
+		return nil, nil
+	}
+	return records, nil
+}
+
+// UpdateStatus applies one status transition with compare-and-swap on the
+// current status column.
+func (store *Store) UpdateStatus(ctx context.Context, input ports.UpdateApplicationStatusInput) error {
+	if store == nil || store.db == nil {
+		return errors.New("update application status: nil store")
+	}
+	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
+	}
+
+	operationCtx, cancel, err := sqlx.WithTimeout(ctx, "update application status", store.operationTimeout)
+	if err != nil {
+		return err
+	}
+	defer cancel()
+
+	at := input.At.UTC()
+	stmt := pgtable.Applications.UPDATE(pgtable.Applications.Status, pgtable.Applications.DecidedAt).
+		SET(string(input.To), at).
+		WHERE(pg.AND(
+			pgtable.Applications.ApplicationID.EQ(pg.String(input.ApplicationID.String())),
+			pgtable.Applications.Status.EQ(pg.String(string(input.ExpectedFrom))),
+		))
+
+	query, args := stmt.Sql()
+	result, err := store.db.ExecContext(operationCtx, query, args...)
+	if err != nil {
+		return fmt.Errorf("update application status: %w", err)
+	}
+	affected, err := result.RowsAffected()
+	if err != nil {
+		return fmt.Errorf("update application status: rows affected: %w", err)
+	}
+	if affected == 0 {
+		probe := pg.SELECT(pgtable.Applications.Status).
+			FROM(pgtable.Applications).
+			WHERE(pgtable.Applications.ApplicationID.EQ(pg.String(input.ApplicationID.String())))
+		probeQuery, probeArgs := probe.Sql()
+
+		var current string
+		row := store.db.QueryRowContext(operationCtx, probeQuery, probeArgs...)
+		if err := row.Scan(&current); err != nil {
+			if sqlx.IsNoRows(err) {
+				return application.ErrNotFound
+			}
+			return fmt.Errorf("update application status: probe: %w", err)
+		}
+		return fmt.Errorf("update application status: %w", application.ErrConflict)
+	}
+	return nil
+}
+
+type rowScanner interface {
+	Scan(dest ...any) error
+}
+
+func scanApplication(rs rowScanner) (application.Application, error) {
+	var (
+		applicationID   string
+		gameID          string
+		applicantUserID string
+		raceName        string
+		status          string
+		createdAt       time.Time
+		decidedAt       sql.NullTime
+	)
+	if err := rs.Scan(
+		&applicationID,
+		&gameID,
+		&applicantUserID,
+		&raceName,
+		&status,
+		&createdAt,
+		&decidedAt,
+	); err != nil {
+		return application.Application{}, err
+	}
+	return application.Application{
+		ApplicationID:   common.ApplicationID(applicationID),
+		GameID:          common.GameID(gameID),
+		ApplicantUserID: applicantUserID,
+		RaceName:        raceName,
+		Status:          application.Status(status),
+		CreatedAt:       createdAt.UTC(),
+		DecidedAt:       sqlx.TimePtrFromNullable(decidedAt),
+	}, nil
+}
+
+// Ensure Store satisfies the ports.ApplicationStore interface at compile
+// time.
+var _ ports.ApplicationStore = (*Store)(nil)