added states table for large client storage

indexedDb/impl/state/callbacks.go

+////////////////////////////////////////////////////////////////////////////////
+// Copyright © 2022 xx foundation                                             //
+//                                                                            //
+// Use of this source code is governed by a license that can be found in the  //
+// LICENSE file.                                                              //
+////////////////////////////////////////////////////////////////////////////////
+
+//go:build js && wasm
+
+package main
+
+import (
+	"encoding/json"
+	"github.com/pkg/errors"
+
+	"gitlab.com/elixxir/client/v4/storage/utility"
+	wDm "gitlab.com/elixxir/xxdk-wasm/indexedDb/worker/dm"
+	stateWorker "gitlab.com/elixxir/xxdk-wasm/indexedDb/worker/state"
+	"gitlab.com/elixxir/xxdk-wasm/worker"
+)
+
+// manager handles the message callbacks, which is used to
+// send information between the model and the main thread.
+type manager struct {
+	wtm   *worker.ThreadManager
+	model utility.WebState
+}
+
+// registerCallbacks registers all the reception callbacks to manage messages
+// from the main thread.
+func (m *manager) registerCallbacks() {
+	m.wtm.RegisterCallback(stateWorker.NewStateTag, m.newStateCB)
+	m.wtm.RegisterCallback(stateWorker.SetTag, m.setCB)
+	m.wtm.RegisterCallback(stateWorker.GetTag, m.getCB)
+}
+
+// newStateCB is the callback for NewState. Returns an empty
+// slice on success or an error message on failure.
+func (m *manager) newStateCB(data []byte) ([]byte, error) {
+	var msg wDm.NewWASMEventModelMessage
+	err := json.Unmarshal(data, &msg)
+	if err != nil {
+		return []byte{}, errors.Errorf(
+			"failed to JSON unmarshal %T from main thread: %+v", msg, err)
+	}
+
+	m.model, err = NewState(msg.DatabaseName)
+	if err != nil {
+		return []byte(err.Error()), nil
+	}
+
+	return []byte{}, nil
+}
+
+// setCB is the callback for stateModel.Set.
+// Returns nil on error or the resulting byte data on success.
+func (m *manager) setCB(data []byte) ([]byte, error) {
+	var msg stateWorker.TransferMessage
+	err := json.Unmarshal(data, &msg)
+	if err != nil {
+		return nil, errors.Errorf(
+			"failed to JSON unmarshal %T from main thread: %+v", msg, err)
+	}
+
+	return nil, m.model.Set(msg.Key, msg.Value)
+}
+
+// getCB is the callback for stateModel.Get.
+// Returns nil on error or the resulting byte data on success.
+func (m *manager) getCB(data []byte) ([]byte, error) {
+	result, err := m.model.Get(string(data))
+	if err != nil {
+		return nil, err
+	}
+	return json.Marshal(result)
+}