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92 lines
1.9 KiB
92 lines
1.9 KiB
import {randId} from "./random";
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import {fetchGet} from "./fetcher";
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import {notNullish} from "./null";
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const localData = {};
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const callbacks = [];
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export function subscribeToGroup(groupId, callback) {
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const callbackId = randId();
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callbacks.push({callbackId, groupId, callback});
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if (groupId >= 0) {
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if (notNullish(localData[groupId])) {
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dispatch(localData[groupId]);
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}
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fetchOne(groupId);
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} else {
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const list = [];
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for (let key in localData) {
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if (localData.hasOwnProperty(key) && notNullish(localData[key])) {
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list.push(localData[key]);
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}
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}
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dispatch(list);
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fetchAll();
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}
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console.log("subscribed");
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console.dir(callbacks);
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return callbackId;
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}
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export function unsubscribeFromGroup(callbackId) {
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const callback = callbacks.find(c => c !== null && c.callbackId === callbackId);
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const index = callbacks.indexOf(callback);
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callbacks[index] = null;
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console.log("unsubscribed");
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console.dir(callbacks);
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}
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function fetchAll() {
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fetchGet("/group/").then(({data, error}) => {
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if (error === null) {
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handleGroups(data);
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}
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});
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}
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function fetchOne(id) {
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fetchGet(`/group/${id}`).then(({data, error}) => {
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if (error === null) {
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handleGroup(data);
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}
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});
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}
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function handleGroups(groups) {
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groups.forEach(g => handleGroup(g));
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for (let key in localData) {
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if (localData.hasOwnProperty(key) && !groups.hasOwnProperty(key)) {
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delete localData[key];
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}
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}
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dispatch(groups);
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}
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function handleGroup(group) {
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localData[group.id] = group;
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dispatch(group);
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}
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function dispatch(data) {
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if (Array.isArray(data)) {
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callbacks
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.filter(c => c !== null)
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.filter(c => c.groupId === -1)
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.forEach(c => c.callback(data));
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} else {
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callbacks
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.filter(c => c !== null)
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.filter(c => c.groupId === data.id)
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.forEach(c => c.callback(data));
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}
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}
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