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/*
* Copyright (C) 2022 Kristóf Marussy <kristof@marussy.com>
*
* This file is part of Sophie.
*
* Sophie is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, version 3.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*
* SPDX-License-Identifier: AGPL-3.0-only
*/
import type { SharedStoreSnapshotOut } from '@sophie/shared';
import {
addMiddleware,
getSnapshot,
IJsonPatch,
IMiddlewareEvent,
onPatch,
} from 'mobx-state-tree';
import type MainStore from '../../stores/MainStore';
import Disposer from '../../utils/Disposer';
import { getLogger } from '../../utils/log';
const log = getLogger('RendererBridge');
export type PatchListener = (patch: IJsonPatch[]) => void;
export default class RendererBridge {
snapshot: SharedStoreSnapshotOut;
private readonly disposeOnPatch: Disposer;
private readonly disposeMiddleware: Disposer;
constructor(store: MainStore, listener: PatchListener) {
this.snapshot = getSnapshot(store.shared);
// The call for the currently pending action, if any.
let topLevelCall: IMiddlewareEvent | undefined;
// An array of accumulated patches if we're in an action, `undefined` otherwise.
let patches: IJsonPatch[] | undefined;
this.disposeOnPatch = onPatch(store.shared, (patch) => {
if (patches === undefined) {
// Update unprotected stores (outside an action) right away.
listener([patch]);
} else {
patches.push(patch);
}
});
this.disposeMiddleware = addMiddleware(store, (call, next, abort) => {
if (call.parentActionEvent !== undefined) {
// We're already in an action, there's no need to enter one.
next(call);
return;
}
if (patches !== undefined) {
log.error(
'Unexpected call',
call,
'during dispatching another call',
topLevelCall,
'with accumulated patches',
patches,
);
abort(undefined);
return;
}
// Make shure that the saved snapshot is consistent with the patches we're going to send.
this.snapshot = getSnapshot(store.shared);
topLevelCall = call;
patches = [];
try {
next(call);
} finally {
try {
if (patches.length > 0) {
listener(patches);
}
} finally {
topLevelCall = undefined;
patches = undefined;
}
}
});
}
dispose(): void {
this.disposeMiddleware();
this.disposeOnPatch();
}
}
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