5 files changed, 411 insertions, 0 deletions
diff --git a/db/atlasdb/001_init_db.go b/db/atlasdb/001_init_db.go
new file mode 100644
index 0000000..8550fc0
--- /dev/null
+++ b/db/atlasdb/001_init_db.go
@@ -0,0 +1,43 @@
+package atlasdb
+
+import (
+	"context"
+	"fmt"
+	"strings"
+
+	"github.com/jmoiron/sqlx"
+)
+
+func init() {
+	migrate(up001, down001)
+}
+
+func up001(ctx context.Context, tx *sqlx.Tx) error {
+	if _, err := tx.ExecContext(ctx, strings.ReplaceAll(`
+		CREATE TABLE accounts (
+			uid         TEXT PRIMARY KEY NOT NULL,
+			username    TEXT NOT NULL DEFAULT '' COLLATE NOCASE,
+			auth_ip     TEXT,
+			auth_token  TEXT,
+			auth_expiry INTEGER,
+			last_server TEXT
+		) STRICT;
+	`, `
+		`, "\n")); err != nil {
+		return fmt.Errorf("create accounts table: %w", err)
+	}
+	if _, err := tx.ExecContext(ctx, `CREATE INDEX accounts_username_idx ON accounts(username, uid)`); err != nil {
+		return fmt.Errorf("create accounts index: %w", err)
+	}
+	return nil
+}
+
+func down001(ctx context.Context, tx *sqlx.Tx) error {
+	if _, err := tx.ExecContext(ctx, `DROP INDEX accounts_username_idx`); err != nil {
+		return fmt.Errorf("drop accounts_username_idx index: %w", err)
+	}
+	if _, err := tx.ExecContext(ctx, `DROP TABLE accounts`); err != nil {
+		return fmt.Errorf("drop accounts table: %w", err)
+	}
+	return nil
+}
diff --git a/db/atlasdb/db.go b/db/atlasdb/db.go
new file mode 100644
index 0000000..d58a784
--- /dev/null
+++ b/db/atlasdb/db.go
@@ -0,0 +1,118 @@
+// Package atlasdb implements sqlite3 database storage for accounts and other atlas data.
+package atlasdb
+
+import (
+	"database/sql"
+	"errors"
+	"fmt"
+	"net/netip"
+	"net/url"
+	"time"
+
+	"github.com/jmoiron/sqlx"
+	"github.com/pg9182/atlas/pkg/api/api0"
+)
+
+// DB stores atlas data in a sqlite3 database.
+type DB struct {
+	x *sqlx.DB
+}
+
+// Open opens a DB from the provided sqlite3 filename.
+func Open(name string) (*DB, error) {
+	// note: WAL and a larger cache makes our writes and queries MUCH faster
+	x, err := sqlx.Connect("sqlite3", (&url.URL{
+		Path: name,
+		RawQuery: (url.Values{
+			"_journal":      {"WAL"},
+			"_cache_size":   {"-32000"},
+			"_busy_timeout": {"4000"},
+		}).Encode(),
+	}).String())
+	if err != nil {
+		return nil, err
+	}
+	return &DB{x}, nil
+}
+
+func (db *DB) Close() error {
+	return db.x.Close()
+}
+
+func (db *DB) GetUIDsByUsername(username string) ([]uint64, error) {
+	var u []uint64
+	if username != "" {
+		if err := db.x.Select(&u, `SELECT uid FROM accounts WHERE username = ?`, username); err != nil {
+			return nil, err
+		}
+	}
+	return u, nil
+}
+
+func (db *DB) GetAccount(uid uint64) (*api0.Account, error) {
+	var obj struct {
+		UID        uint64 `db:"uid"`
+		Username   string `db:"username"`
+		AuthIP     string `db:"auth_ip"`
+		AuthToken  string `db:"auth_token"`
+		AuthExpiry int64  `db:"auth_expiry"`
+		LastServer string `db:"last_server"`
+	}
+	if err := db.x.Get(&obj, `SELECT * FROM accounts WHERE uid = ?`, uid); err != nil {
+		if errors.Is(err, sql.ErrNoRows) {
+			return nil, nil
+		}
+		return nil, err
+	}
+
+	var authExpiry time.Time
+	if obj.AuthExpiry != 0 {
+		authExpiry = time.Unix(obj.AuthExpiry, 0)
+	}
+
+	var authIP netip.Addr
+	if obj.AuthIP != "" {
+		if v, err := netip.ParseAddr(obj.AuthIP); err == nil {
+			authIP = v
+		} else {
+			return nil, fmt.Errorf("parse auth_ip: %w", err)
+		}
+	}
+
+	return &api0.Account{
+		UID:             obj.UID,
+		Username:        obj.Username,
+		AuthIP:          authIP,
+		AuthToken:       obj.AuthToken,
+		AuthTokenExpiry: authExpiry,
+		LastServerID:    obj.LastServer,
+	}, nil
+}
+
+func (db *DB) SaveAccount(a *api0.Account) error {
+	var authExpiry int64
+	if !a.AuthTokenExpiry.IsZero() {
+		authExpiry = a.AuthTokenExpiry.Unix()
+	}
+
+	var authIP string
+	if a.AuthIP.IsValid() {
+		authIP = a.AuthIP.StringExpanded()
+	}
+
+	if _, err := db.x.NamedExec(`
+		INSERT OR REPLACE INTO
+		accounts ( uid,  username,  auth_ip,  auth_token,  auth_expiry,  last_server)
+		VALUES   (:uid, :username, :auth_ip, :auth_token, :auth_expiry, :last_server)
+	`, map[string]any{
+		"uid":         a.UID,
+		"username":    a.Username,
+		"auth_ip":     authIP,
+		"auth_token":  a.AuthToken,
+		"auth_expiry": authExpiry,
+		"last_server": a.LastServerID,
+	}); err != nil {
+		return err
+	}
+	return nil
+}
diff --git a/db/atlasdb/db_test.go b/db/atlasdb/db_test.go
new file mode 100644
index 0000000..1af59f1
--- /dev/null
+++ b/db/atlasdb/db_test.go
@@ -0,0 +1,31 @@
+package atlasdb
+
+import (
+	"context"
+	"path/filepath"
+	"testing"
+
+	_ "github.com/mattn/go-sqlite3"
+	"github.com/pg9182/atlas/pkg/api/api0/api0testutil"
+)
+
+func TestAccountStorage(t *testing.T) {
+	db, err := Open(filepath.Join(t.TempDir(), "atlas.db"))
+	if err != nil {
+		panic(err)
+	}
+	defer db.Close()
+
+	cur, tgt, err := db.Version()
+	if err != nil {
+		panic(err)
+	}
+	if cur != 0 {
+		panic("current version not 0")
+	}
+	if err := db.MigrateUp(context.Background(), tgt); err != nil {
+		panic(err)
+	}
+
+	api0testutil.TestAccountStorage(t, db)
+}
diff --git a/db/atlasdb/migrations.go b/db/atlasdb/migrations.go
new file mode 100644
index 0000000..3aa47bb
--- /dev/null
+++ b/db/atlasdb/migrations.go
@@ -0,0 +1,170 @@
+package atlasdb
+
+import (
+	"context"
+	"database/sql"
+	"fmt"
+	"path"
+	"runtime"
+	"sort"
+	"strconv"
+	"strings"
+
+	"github.com/jmoiron/sqlx"
+)
+
+// TODO: support versions which can't be migrated down from
+
+type migration struct {
+	Name string
+	Up   func(context.Context, *sqlx.Tx) error
+	Down func(context.Context, *sqlx.Tx) error
+}
+
+var migrations = map[uint64]migration{}
+
+func migrate(up, down func(context.Context, *sqlx.Tx) error) {
+	_, fn, _, ok := runtime.Caller(1)
+	if !ok {
+		panic("add migration: failed to get filename")
+	}
+	fn = path.Base(strings.ReplaceAll(fn, `\`, `/`))
+
+	if n, _, ok := strings.Cut(fn, "_"); !ok {
+		panic("add migration: failed to parse filename")
+	} else if v, err := strconv.ParseUint(n, 10, 64); err != nil {
+		panic("add migration: failed to parse filename: " + err.Error())
+	} else if v == 0 {
+		panic("add migration: version must not be 0")
+	} else {
+		migrations[v] = migration{strings.TrimSuffix(n, ".go"), up, down}
+	}
+}
+
+// Version gets the current and required database versions. It should be checked
+// before using the database.
+func (db *DB) Version() (current, required uint64, err error) {
+	if err = db.x.Get(&current, `PRAGMA user_version`); err != nil {
+		err = fmt.Errorf("get version: %w", err)
+		return
+	}
+	for v := range migrations {
+		if v > required {
+			required = v
+		}
+	}
+	return
+}
+
+// MigrateUp migrates the database to the provided version.
+func (db *DB) MigrateUp(ctx context.Context, to uint64) error {
+	tx, err := db.x.BeginTxx(ctx, &sql.TxOptions{})
+	if err != nil {
+		return fmt.Errorf("begin transaction: %w", err)
+	}
+	defer tx.Rollback()
+
+	var cv uint64
+	if err = tx.GetContext(ctx, &cv, `PRAGMA user_version`); err != nil {
+		return fmt.Errorf("get version: %w", err)
+	}
+	if to < cv {
+		return fmt.Errorf("target version %d is less than current version %d", to, cv)
+	}
+
+	var ms []uint64
+	foundC, foundT := cv == 0, to == 0
+	for v := range migrations {
+		if v == cv {
+			foundC = true
+		}
+		if v == to {
+			foundT = true
+		}
+		if v > cv && v <= to {
+			ms = append(ms, v)
+		}
+	}
+	if !foundC {
+		return fmt.Errorf("unsupported db version %d", cv)
+	}
+	if !foundT {
+		return fmt.Errorf("unknown db version %d", cv)
+	}
+
+	sort.Slice(ms, func(i, j int) bool {
+		return ms[i] < ms[j]
+	})
+
+	for _, v := range ms {
+		if err := migrations[v].Up(ctx, tx); err != nil {
+			return fmt.Errorf("migrate %d: %w", v, err)
+		}
+	}
+
+	if _, err := tx.ExecContext(ctx, `PRAGMA user_version = `+strconv.FormatUint(to, 10)); err != nil {
+		return fmt.Errorf("update version: %w", err)
+	}
+
+	if err := tx.Commit(); err != nil {
+		return fmt.Errorf("commit transaction: %w", err)
+	}
+	return nil
+}
+
+// MigrateDown migrates the database down to the provided version. This will
+// probably eat your data.
+func (db *DB) MigrateDown(ctx context.Context, to uint64) error {
+	tx, err := db.x.BeginTxx(ctx, &sql.TxOptions{})
+	if err != nil {
+		return fmt.Errorf("begin transaction: %w", err)
+	}
+	defer tx.Rollback()
+
+	var cv uint64
+	if err = tx.GetContext(ctx, &cv, `PRAGMA user_version`); err != nil {
+		return fmt.Errorf("get version: %w", err)
+	}
+	if cv < to {
+		return fmt.Errorf("current version %d is less than target version %d", cv, to)
+	}
+
+	var ms []uint64
+	foundC, foundT := cv == 0, to == 0
+	for v := range migrations {
+		if v == cv {
+			foundC = true
+		}
+		if v == to {
+			foundT = true
+		}
+		if v <= cv && v > to {
+			ms = append(ms, v)
+		}
+	}
+	if !foundC {
+		return fmt.Errorf("unsupported db version %d", cv)
+	}
+	if !foundT {
+		return fmt.Errorf("unknown db version %d", cv)
+	}
+
+	sort.Slice(ms, func(i, j int) bool {
+		return ms[i] > ms[j]
+	})
+
+	for _, v := range ms {
+		if err := migrations[v].Down(ctx, tx); err != nil {
+			return fmt.Errorf("migrate %d: %w", v, err)
+		}
+	}
+
+	if _, err := tx.ExecContext(ctx, `PRAGMA user_version = `+strconv.FormatUint(to, 10)); err != nil {
+		return fmt.Errorf("update version: %w", err)
+	}
+
+	if err := tx.Commit(); err != nil {
+		return fmt.Errorf("commit transaction: %w", err)
+	}
+	return nil
+}
diff --git a/db/atlasdb/migrations_test.go b/db/atlasdb/migrations_test.go
new file mode 100644
index 0000000..2149717
--- /dev/null
+++ b/db/atlasdb/migrations_test.go
@@ -0,0 +1,49 @@
+package atlasdb
+
+import (
+	"context"
+	"path/filepath"
+	"sort"
+	"testing"
+
+	_ "github.com/mattn/go-sqlite3"
+)
+
+func TestMigrations(t *testing.T) {
+	db, err := Open(filepath.Join(t.TempDir(), "atlas.db"))
+	if err != nil {
+		panic(err)
+	}
+	defer db.Close()
+
+	cur, _, err := db.Version()
+	if err != nil {
+		panic(err)
+	}
+	if cur != 0 {
+		t.Fatalf("current version not 0")
+	}
+
+	var ms []uint64
+	for m := range migrations {
+		ms = append(ms, m)
+	}
+	sort.Slice(ms, func(i, j int) bool {
+		return ms[i] < ms[j]
+	})
+
+	for _, to := range ms {
+		if err := db.MigrateUp(context.Background(), to); err != nil {
+			t.Fatalf("migrate up to %d: %v", to, err)
+		}
+		if err := db.MigrateDown(context.Background(), 0); err != nil {
+			t.Fatalf("migrate down from %d to 0: %v", to, err)
+		}
+		if err := db.MigrateUp(context.Background(), to); err != nil {
+			t.Fatalf("migrate up to %d again: %v", to, err)
+		}
+		if err := db.MigrateDown(context.Background(), 0); err != nil {
+			t.Fatalf("migrate down from %d to 0 again: %v", to, err)
+		}
+	}
+}