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import {type JsonNode, Model, type Patch} from 'json-joy/lib/json-crdt';
import {concurrency} from 'thingies/lib/concurrency';
import {createRace} from 'thingies/lib/createRace';
import {SESSION_GLOBAL} from '../constants';
import {Subject} from 'rxjs';
import {first, takeUntil} from 'rxjs/operators';
import type {
BlockId,
LocalRepo,
LocalRepoDeleteEvent,
LocalRepoEvent,
LocalRepoMergeEvent,
LocalRepoRebaseEvent,
LocalRepoResetEvent,
} from '../local/types';
export class EditSession<N extends JsonNode = JsonNode<any>> {
public log: Log<N>;
protected _stopped = false;
protected _stop$ = new Subject<void>();
public onsyncerror?: (error: Error | unknown) => void;
private _syncRace = createRace();
public get model(): Model<N> {
return this.log.end;
}
constructor(
public readonly repo: LocalRepo,
public readonly id: BlockId,
protected start: Model<N>,
public cursor: undefined | unknown = undefined,
protected readonly session: number = Math.floor(Math.random() * 0x7fffffff),
) {
this.log = new Log<N>(() => this.start.clone());
const api = this.log.end.api;
const flushUnsubscribe = api.onFlush.listen(() => {
this.syncLog();
});
const patchUnsubscribe = api.onPatch.listen((patch) => {
const id = patch.getId();
Iif (!id) return;
const clock = this.model.clock;
Eif (id.sid === clock.sid && clock.time >= id.time) {
this.syncLog();
}
});
this._stop$.pipe(first()).subscribe(() => {
flushUnsubscribe();
patchUnsubscribe();
});
this.repo.change$(this.id).pipe(takeUntil(this._stop$)).subscribe(this.onEvent);
}
public dispose(): void {
if (this._stopped) return;
this._stopped = true;
this._stop$.next();
}
protected clear(): void {
const {start, log} = this;
const empty = Model.create(undefined, start.clock.sid);
start.reset(<any>empty);
log.patches.clear();
log.end.reset(<any>empty);
}
private saveInProgress = false;
private readonly _syncQueue = concurrency(1);
/**
* Push (persist) any in-memory changes and pull (load) the latest state
* from the local repo.
*/
public sync(): Promise<null | {remote?: Promise<void>}> {
return this._syncQueue(() => this._sync());
}
private async _sync(): Promise<null | {remote?: Promise<void>}> {
if (this._stopped) return null;
const log = this.log;
const api = log.end.api;
api.flush();
this.saveInProgress = true;
try {
const patches: Patch[] = [];
log.patches.forEach((patch) => {
patches.push(patch.v);
});
const length = patches.length;
// TODO: After async call check that sync state is still valid. New patches, might have been added.
if (length || this.cursor === undefined) {
const time = this.start.clock.time - 1;
const res = await this.repo.sync({
id: this.id,
patches,
time,
cursor: this.cursor,
session: this.session,
});
if (this._stopped) return null;
// TODO: After sync call succeeds, remove the patches from the log.
if (length) {
const last = patches[length - 1];
const lastId = last.getId();
Eif (lastId) this.log.advanceTo(lastId);
this.start.applyBatch(patches);
}
if (res.model) {
this._syncRace(() => {
this.reset(<any>res.model!);
});
} else if (res.merge && res.merge) {
this._syncRace(() => {
this.merge(<any>res.merge!);
});
}
const cursorBehind = this.cursor !== res.cursor;
if (cursorBehind) {
const timer = setTimeout(async () => {
try {
if (this._stopped) return;
const get = await this.repo.getIf({
id: this.id,
cursor: this.cursor,
});
Iif (this._stopped) return;
if (!get) return;
this.reset(<any>get.model);
this.cursor = get.cursor;
} catch {
// Best-effort catch-up in a detached timer. The block may have
// been deleted (getIf throws "NotFound") or the repo stopped
// between scheduling and firing. Deletion is handled via the
// change$/onEvent delete flow, so swallow the error here instead
// of letting it surface as an unhandled promise rejection.
}
}, 50);
(timer as {unref?: () => void}).unref?.();
}
return {remote: res.remote};
} else {
const res = await this.repo.getIf({id: this.id, time: this.model.clock.time - 1, cursor: this.cursor});
if (this._stopped) return null;
Iif (res) {
this.reset(<any>res.model);
this.cursor = res.cursor;
}
return null;
}
} finally {
this.saveInProgress = false;
this.drainEvents();
}
}
public syncLog(): void {
Iif (!this.log.patches.size()) {
return;
}
this._syncRace(() => {
this.sync()
.then((result) => {
Iif (result instanceof Error) this.onsyncerror?.(result);
})
.catch((error) => {
console.error('syncLog: sync error', error);
this.onsyncerror?.(error);
});
});
}
public async del(): Promise<void> {
this.clear();
this.dispose();
await this.repo.del(this.id);
}
/**
* Load latest state from the local repo.
*/
public async load(): Promise<void> {
const {model} = await this.repo.get({id: this.id});
Eif (model.clock.time > this.start.clock.time) this.reset(<any>model);
}
public loadSilent(): void {
this.load().catch(() => {});
}
// ------------------------------------------------------- change integration
protected reset(model: Model<N>): void {
this.start = model.clone();
const log = this.log;
const end = log.end;
const ext = end.ext;
Iif (end.api.builder.patch.ops.length) end.api.flush();
end.reset(model);
end.ext = ext;
log.patches.forEach((patch) => end.applyPatch(patch.v));
}
protected rebase(patches: Patch[]): void {
Iif (patches.length === 0) return;
const log = this.log;
const end = log.end;
Iif (end.api.builder.patch.ops.length) end.api.flush();
Eif (log.patches.size() === 0) {
this.merge(patches);
return;
}
this.start.applyBatch(patches);
const newEnd = this.start.clone();
const lastPatch = patches[patches.length - 1];
let nextTick = lastPatch.getId()!.time + lastPatch.span();
const rebased: Patch[] = [];
log.patches.forEach(({v}) => {
const patch = v.rebase(nextTick);
rebased.push(patch);
newEnd.applyPatch(patch);
nextTick += patch.span();
});
log.patches.clear();
for (const patch of rebased) log.patches.set(patch.getId()!, patch);
const ext = log.end.ext;
log.end.reset(newEnd);
log.end.ext = ext;
}
protected merge(patches: Patch[]): void {
if (!patches.length) return;
const start = this.start;
const log = this.log;
const end = log.end;
const sid = end.clock.sid;
for (const patch of patches) {
const patchId = patch.getId();
Iif (!patchId) continue;
const patchSid = patchId.sid;
Iif (patchSid === SESSION_GLOBAL) continue;
if (patchSid === sid && patchId.time < end.clock.time) continue;
end.applyPatch(patch);
start.applyPatch(patch);
log.patches.del(patchId);
}
}
// ------------------------------------------------ reactive event processing
private events: LocalRepoEvent[] = [];
private onEvent = (event: LocalRepoEvent): void => {
Iif (this._stopped) return;
if ((event as LocalRepoMergeEvent).merge) {
const cursor = (event as LocalRepoMergeEvent).cursor;
Eif (cursor !== undefined) {
this.cursor = cursor;
}
}
if ((event as LocalRepoRebaseEvent).rebase) {
if ((event as LocalRepoRebaseEvent).session === this.session) return;
}
this.events.push(event);
this.drainEvents();
};
private drainEvents(): void {
if (this.saveInProgress || this._stopped) return;
this._syncRace(() => {
const events = this.events;
const length = events.length;
for (let i = 0; i < length; i++) {
const event = events[i];
try {
if ((event as LocalRepoResetEvent).reset) this.reset(<any>(event as LocalRepoResetEvent).reset);
else if ((event as LocalRepoRebaseEvent).rebase) this.rebase((event as LocalRepoRebaseEvent).rebase);
else if ((event as LocalRepoMergeEvent).merge) this.merge((event as LocalRepoMergeEvent).merge);
else Eif ((event as LocalRepoDeleteEvent).del) {
this.clear();
break;
}
} catch (error) {
// tslint:disable-next-line no-console
console.error('Failed to apply event', event, error);
}
}
this.events = [];
});
}
}
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