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import { redirect } from '@sveltejs/kit';
import { goto } from '$app/navigation';
import * as api from './apiServer.js';
import * as r from './state/remote/state.svelte.js';
import * as l from './state/local/conversations.svelte.js';
import * as p from './state/local/push.svelte.js';
import { Watchdog } from './watchdog.js';
import { DateTime } from 'luxon';
class Conversation {
static fromRemote({ at, id, name }, messages, meta) {
const sentAt = messages
.filter((message) => message.conversation === id)
.map((message) => message.at);
const lastEventAt = DateTime.max(at, ...sentAt);
const lastReadAt = meta.get(id)?.lastReadAt;
const hasUnreads = lastReadAt === undefined || lastEventAt > lastReadAt;
return new Conversation({ at, id, name, hasUnreads });
}
constructor({ at, id, name, hasUnreads }) {
this.at = at;
this.id = id;
this.name = name;
this.hasUnreads = hasUnreads;
}
}
class Message {
static fromRemote({ id, at, conversation, sender, body }, users) {
return new Message({
id,
at,
conversation,
sender: users.get(sender),
body,
});
}
constructor({ id, at, conversation, sender, body }) {
this.id = id;
this.at = at;
this.conversation = conversation;
this.sender = sender;
this.body = body;
}
}
class Session {
remote = $state();
local = $state();
push = $state();
currentUser = $derived(this.remote.currentUser);
users = $derived(this.remote.users.all);
messages = $derived(
this.remote.messages.all.map((message) => Message.fromRemote(message, this.users)),
);
conversations = $derived(
this.remote.conversations.all.map((conversation) =>
Conversation.fromRemote(conversation, this.messages, this.local.all),
),
);
static async boot({ login, resume_point, heartbeat, events }) {
const remote = r.State.boot({
currentUser: login,
resumePoint: resume_point,
heartbeat,
events,
});
const local = l.Conversations.fromLocalStorage();
const push = await p.Push.boot(events);
return new Session(remote, local, push);
}
async reboot({ login, resume_point, heartbeat, events }) {
this.remote = r.State.boot({
currentUser: login,
resumePoint: resume_point,
heartbeat,
events,
});
this.push = await p.Push.boot(events);
}
constructor(remote, local, push) {
this.watchdog = new Watchdog(this.watchdogExpired.bind(this));
this.remote = remote;
this.local = local;
this.push = push;
}
begin() {
this.events = api.subscribeToEvents(this.remote.resumePoint);
this.events.onmessage = this.onMessage.bind(this);
this.watchdog.reset(this.heartbeatMillis());
}
end() {
this.watchdog.stop();
this.events.close();
this.events = null;
}
active() {
return this.events !== null;
}
onMessage(message) {
const event = JSON.parse(message.data);
this.remote.onEvent(event);
this.push.onEvent(event);
this.local.retainConversations(this.remote.conversations.all);
this.watchdog.reset(this.heartbeatMillis());
}
heartbeatMillis() {
return this.remote.heartbeat /* in seconds */ * 1000 /* millis */;
}
async watchdogExpired() {
// We leave `this.events` set here as a marker that the interruption is temporary. That's then
// used below, after a potential delay, to decide whether to start the stream back up again or
// not.
this.events.close();
this.watchdog.stop();
const response = await bootOrNavigate(goto);
// Session abandoned; give up here. We need to do this after each await, because that's time in
// which the session may have been abandoned.
if (!this.active()) return;
await this.reboot(response);
this.begin();
}
}
async function bootOrNavigate(navigateTo) {
try {
const response = await api.retry(async () => await api.boot());
return response.data;
} catch (err) {
switch (true) {
case err instanceof api.LoggedOut:
// Can't use `Push` state manager here as it requires boot, which we just failed to do.
const sw = await navigator.serviceWorker.ready;
const subscription = await sw.pushManager.getSubscription();
if (subscription !== null) {
await subscription.unsubscribe();
}
await navigateTo('/login');
break;
case err instanceof api.SetupRequired:
await navigateTo('/setup');
break;
default:
throw err;
}
}
}
export async function boot() {
const response = await bootOrNavigate(async (url) => redirect(307, url));
return await Session.boot(response);
}
|
