66 lines
1.6 KiB
JavaScript
66 lines
1.6 KiB
JavaScript
"use strict";
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window.VK = window.VK ?? {};
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const bus = new Map();
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window.VK.bus = {
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on(type, handler) {
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const handlers = bus.get(type) ?? new Set();
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handlers.add(handler);
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bus.set(type, handlers);
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return () => handlers.delete(handler);
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},
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emit(type, payload) {
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for (const handler of bus.get(type) ?? []) {
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try {
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handler(payload);
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} catch (error) {
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console.error(`[bus] ${type} handler failed`, error);
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}
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}
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}
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};
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async function request(path, options) {
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const response = await fetch(path, options);
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let body;
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try {
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body = await response.json();
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} catch {
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throw new Error(`request failed (${response.status})`);
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}
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if (!body.ok) {
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const error = new Error(body.error ?? `request failed (${response.status})`);
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if (body.code) error.code = body.code;
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throw error;
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}
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return body.result;
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}
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window.VK.api = {
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get: path => request(path),
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post: (path, data) =>
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request(path, {
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method: "POST",
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headers: { "Content-Type": "application/json" },
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body: JSON.stringify(data ?? {})
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})
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};
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window.VK.connectEvents = function connectEvents() {
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const source = new EventSource("/api/events");
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source.onmessage = message => {
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let data;
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try {
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data = JSON.parse(message.data);
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} catch {
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return;
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}
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window.VK.bus.emit("event", data);
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};
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source.onerror = () => window.VK.bus.emit("sse-error");
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};
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