stub

src/lib/event/serialize.go

@@ -0,0 +1,34 @@
+package event
+
+import (
+	"encoding/json"
+	"fmt"
+)
+
+func Serialize(t string, v any) ([]byte, error) {
+	var wrapper struct {
+		Type    string `json:"type"`
+		Payload any    `json:"payload"`
+	}
+	wrapper.Type = t
+	wrapper.Payload = v
+	return json.Marshal(wrapper)
+}
+
+func Parse(b []byte, typesToPointers map[string]any) (string, error) {
+	var wrapper struct {
+		Type    string          `json:"type"`
+		Payload json.RawMessage `json:"payload"`
+	}
+	if err := json.Unmarshal(b, &wrapper); err != nil {
+		return "", err
+	}
+
+	if ptr, ok := typesToPointers[wrapper.Type]; !ok {
+		return "", fmt.Errorf("cannot parse unknown type %s", wrapper.Type)
+	} else if err := json.Unmarshal(wrapper.Payload, ptr); err != nil {
+		return "", fmt.Errorf("failed parsing type %s: %w", wrapper.Type, err)
+	}
+
+	return wrapper.Type, nil
+}

src/state/fsm/lobby/events.go

@@ -8,11 +8,11 @@ import (
 )
 
 func (l *Lobby) Join(ctx context.Context, id int) error {
-	return l.upsertEvent(ctx, lobby.PlayerJoin{ID: id})
+	return l.upsertEvent(ctx, &lobby.PlayerJoin{ID: id})
 }
 
 func (l *Lobby) Leave(ctx context.Context, id int) error {
-	return l.upsertEvent(ctx, lobby.PlayerLeave{ID: id})
+	return l.upsertEvent(ctx, &lobby.PlayerLeave{ID: id})
 }
 
 func (l *Lobby) upsertEvent(ctx context.Context, e lobby.Event) error {
@@ -43,11 +43,11 @@ func upsertEvent(ctx context.Context, lobbyID int, e lobby.Event) error {
 
 func (l *Lobby) apply(e lobby.Event) error {
 	switch e := e.(type) {
-	case lobby.PlayerJoin:
+	case *lobby.PlayerJoin:
 		if !slices.Contains(l.Players, e.ID) {
 			l.Players = append(l.Players, e.ID)
 		}
-	case lobby.PlayerLeave:
+	case *lobby.PlayerLeave:
 		l.Players = slices.DeleteFunc(l.Players, func(id int) bool { return id == e.ID })
 	}
 	return nil

src/state/fsm/lobby/internal/event.go

@@ -1,8 +1,8 @@
 package lobby
 
 import (
-	"encoding/json"
 	"fmt"
+	"gitea/price-is-wrong/src/lib/event"
 )
 
 type Event interface{}
@@ -16,37 +16,14 @@ type PlayerLeave struct {
 }
 
 func ParseEvent(b []byte) (Event, error) {
-	var wrapper struct {
+	typesToPointers := map[string]any{
-		Type    string          `json:"type"`
+		"*lobby.PlayerJoin":  &PlayerJoin{},
-		Payload json.RawMessage `json:"payload"`
+		"*lobby.PlayerLeave": &PlayerLeave{},
 	}
-	if err := json.Unmarshal(b, &wrapper); err != nil {
+	t, err := event.Parse(b, typesToPointers)
-		return nil, err
+	return typesToPointers[t], err
-	}
-
-	var e Event
-	var err error
-	switch wrapper.Type {
-	case "lobby.PlayerJoin":
-		v := PlayerJoin{}
-		err = json.Unmarshal(wrapper.Payload, &v)
-		e = v
-	case "lobby.PlayerLeave":
-		v := PlayerLeave{}
-		err = json.Unmarshal(wrapper.Payload, &v)
-		e = v
-	default:
-		return nil, fmt.Errorf("failed to parse event %q", wrapper.Type)
-	}
-	return e, err
 }
 
 func MarshalEvent(e Event) ([]byte, error) {
-	var marshalme struct {
+	return event.Serialize(fmt.Sprintf("%T", e), e)
-		Payload Event  `json:"payload"`
-		Type    string `json:"type"`
-	}
-	marshalme.Payload = e
-	marshalme.Type = fmt.Sprintf("%T", e)
-	return json.Marshal(marshalme)
 }

src/state/fsm/lobby/internal/event_test.go

@@ -1,6 +1,7 @@
 package lobby_test
 
 import (
+	"fmt"
 	lobby "gitea/price-is-wrong/src/state/fsm/lobby/internal"
 	"testing"
 )
@@ -9,8 +10,8 @@ func TestMarshalUnmarshal(t *testing.T) {
 	cases := map[string]struct {
 		e lobby.Event
 	}{
-		"PlayerJoin":  {e: lobby.PlayerJoin{ID: 1}},
+		"PlayerJoin":  {e: &lobby.PlayerJoin{ID: 1}},
-		"PlayerLeave": {e: lobby.PlayerLeave{ID: 1}},
+		"PlayerLeave": {e: &lobby.PlayerLeave{ID: 1}},
 	}
 
 	for name, d := range cases {
@@ -28,7 +29,7 @@ func TestMarshalUnmarshal(t *testing.T) {
 			}
 			t.Logf("unmarshalled: %+v", e)
 
-			if c.e != e {
+			if fmt.Sprintf("%+v", c.e) != fmt.Sprintf("%+v", e) {
 				t.Errorf("expected %+v but got %+v", c.e, e)
 			}
 		})

src/state/fsm/priceiswrong/events.go

@@ -0,0 +1,44 @@
+package priceiswrong
+
+import (
+	"context"
+	"gitea/price-is-wrong/src/lib/db"
+	priceiswrong "gitea/price-is-wrong/src/state/fsm/priceiswrong/internal"
+	"io"
+)
+
+func (p *PriceIsWrong) TODO(ctx context.Context, id int) error {
+	return io.EOF
+}
+
+func (p *PriceIsWrong) upsertEvent(ctx context.Context, e priceiswrong.Event) error {
+	if err := upsertEvent(ctx, p.id, e); err != nil {
+		return err
+	}
+
+	p2, err := openID(ctx, p.id)
+	if err != nil {
+		return err
+	}
+
+	*p = *p2
+	return nil
+}
+
+func upsertEvent(ctx context.Context, priceIsWrongID int, e priceiswrong.Event) error {
+	b, err := priceiswrong.MarshalEvent(e)
+	if err != nil {
+		return err
+	}
+
+	_, err = db.From(ctx).ExecContext(ctx, `
+      INSERT INTO priceiswrong_events (priceiswrong_id, payload) VALUES (?, ?)
+   `, priceIsWrongID, b)
+	return err
+}
+
+func (p *PriceIsWrong) apply(e priceiswrong.Event) error {
+	switch e := e.(type) {
+	}
+	return nil
+}

src/state/fsm/priceiswrong/internal/event.go

@@ -0,0 +1,20 @@
+package priceiswrong
+
+import (
+	"fmt"
+	"gitea/price-is-wrong/src/lib/event"
+)
+
+type Event interface{}
+
+func ParseEvent(b []byte) (Event, error) {
+	typesToPointers := map[string]any{
+		"*any": &b,
+	}
+	t, err := event.Parse(b, typesToPointers)
+	return typesToPointers[t], err
+}
+
+func MarshalEvent(e Event) ([]byte, error) {
+	return event.Serialize(fmt.Sprintf("%T", e), e)
+}

src/state/fsm/priceiswrong/open.go

@@ -0,0 +1,115 @@
+package priceiswrong
+
+import (
+	"context"
+	"database/sql"
+	"fmt"
+	"gitea/price-is-wrong/src/lib/db"
+	priceiswrong "gitea/price-is-wrong/src/state/fsm/priceiswrong/internal"
+)
+
+type PriceIsWrong struct {
+	id          int
+	Host        int
+	Contestants Player
+}
+
+type Player struct {
+	ID int
+}
+
+func Open(ctx context.Context, name string) (*PriceIsWrong, error) {
+	if err := initialize(ctx); err != nil {
+		return nil, fmt.Errorf("failed to initialize priceiswrong: %w", err)
+	}
+
+	if result, err := open(ctx, name); err != nil {
+		return nil, err
+	} else if result == nil {
+		if err := create(ctx, name); err != nil {
+			return nil, err
+		}
+	}
+
+	return mustOpen(ctx, name)
+}
+
+func mustOpen(ctx context.Context, name string) (*PriceIsWrong, error) {
+	result, err := open(ctx, name)
+	if err != nil {
+		return nil, err
+	}
+	if result == nil {
+		return nil, fmt.Errorf("no priceiswrong found with name %s", name)
+	}
+	return result, nil
+}
+
+func open(ctx context.Context, name string) (*PriceIsWrong, error) {
+	row := db.From(ctx).QueryRow(`SELECT id FROM priceiswrongs WHERE name=?`, name)
+	if err := row.Err(); err != nil {
+		return nil, fmt.Errorf("no priceiswrong found with name %s", name)
+	}
+
+	var id sql.NullInt32
+	if err := row.Scan(&id); err == sql.ErrNoRows || !id.Valid {
+		return nil, nil
+	} else if err != nil {
+		return nil, fmt.Errorf("failed to scan id from priceiswrongs: %w", err)
+	}
+
+	return openID(ctx, int(id.Int32))
+}
+
+func openID(ctx context.Context, id int) (*PriceIsWrong, error) {
+	rows, err := db.From(ctx).QueryContext(ctx, `
+      SELECT payload
+      FROM priceiswrong_events
+      WHERE priceiswrong_events.priceiswrong_id=?
+      ORDER BY id
+   `, id)
+	if err != nil {
+		return nil, fmt.Errorf("failed to query event payloads for id %d: %w", id, err)
+	}
+	defer rows.Close()
+
+	result := PriceIsWrong{id: id}
+	for rows.Next() {
+		var b []byte
+		if err := rows.Scan(&b); err != nil {
+			return nil, fmt.Errorf("failed to scan event: %w", err)
+		}
+		event, err := priceiswrong.ParseEvent(b)
+		if err != nil {
+			return nil, fmt.Errorf("failed to parse event: %w", err)
+		}
+		if err := result.apply(event); err != nil {
+			return nil, fmt.Errorf("failed to apply event %s: %w", b, err)
+		}
+	}
+
+	return &result, rows.Err()
+}
+
+func create(ctx context.Context, name string) error {
+	_, err := db.From(ctx).ExecContext(ctx, `
+      INSERT INTO priceiswrongs (name) VALUES (?)
+   `, name)
+	return err
+}
+
+func initialize(ctx context.Context) error {
+	_, err := db.From(ctx).ExecContext(ctx, `
+      CREATE TABLE IF NOT EXISTS priceiswrongs (
+         id INTEGER PRIMARY KEY,
+         name TEXT
+      );
+      CREATE TABLE IF NOT EXISTS priceiswrong_events (
+         id INTEGER PRIMARY KEY,
+         priceiswrong_id NUMBER,
+         payload TEXT,
+         FOREIGN KEY (priceiswrong_id) REFERENCES priceiswrongs (id)
+      );
+   `)
+	return err
+}