145 lines
2.7 KiB
JavaScript
145 lines
2.7 KiB
JavaScript
const uuid = require('node-uuid');
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const Emitter = require('component-emitter');
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const crosstab = require('crosstab');
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const values = require('lodash.values');
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const actions = require('./state/actions');
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const emitter = module.exports = new Emitter();
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let isMaster = crosstab.util.tabs['MASTER_TAB'].id === crosstab.id;
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const bridge = new Map();
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const {
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updatePrinters,
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updateWorkerId
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} = actions;
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const printers = {
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'1': {
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id: '1',
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name: 'Main printer',
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lock: ''
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},
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'2': {
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id: '2',
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name: 'Handled printer',
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lock: ''
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}
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};
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const handlers = {
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'PRINT': (action, fn) => {
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fn();
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},
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'LOCK_PRINTER': (action, fn) => {
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const alreadyLocked = values(printers).filter((printer) => {
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return printer.lock === action._origin;
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});
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alreadyLocked.forEach((printer) => {
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printers[printer.id] = {
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...printers[printer.id],
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lock: ''
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};
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});
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printers[action.payload] = {
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...printers[action.payload],
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lock: action._origin
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};
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fn();
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}
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};
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crosstab.util.events.on('message', ({
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data,
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origin
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}) => {
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if (origin === crosstab.id) {
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return;
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}
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if (!data || !data.type) {
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return;
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}
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if (!data._id) {
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return emitter.emit('action', data);
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}
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const b = bridge.get(data._id);
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if (b) {
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data.error ? b.reject(new Error(data.error)) : b.resolve(data.payload);
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return bridge.delete(data._id);
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}
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if (!handlers[data.type]) {
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return emitter.emit('action', data);
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}
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handlers[data.type]({
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...data,
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_origin: origin
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}, (err, res) => {
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crosstab.broadcast('message', {
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...data,
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error: err && err.message
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}, origin);
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});
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});
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crosstab.util.events.on(crosstab.util.eventTypes.becomeMaster, () => {
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isMaster = true;
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});
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crosstab.util.events.on(crosstab.util.eventTypes.demoteFromMaster, () => {
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isMaster = false;
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});
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const dispatch = module.exports.dispatch = (action, tab) => {
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if (isMaster && !tab) {
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if (handlers[action.type]) {
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return new Promise(function(resolve, reject) {
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handlers[action.type]({
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...action,
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_origin: crosstab.id
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}, function(err, res) {
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return err ? reject(err) : resolve(res);
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});
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});
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}
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}
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const id = uuid.v4();
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const then = new Promise((resolve, reject) => {
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bridge.set(id, {
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resolve,
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reject
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});
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});
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crosstab.broadcast('message', {
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...action,
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_id: id
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}, tab);
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return then;
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};
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setTimeout(function() {
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emitter.emit('action', updateWorkerId(crosstab.id));
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}, 450);
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setInterval(() => {
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if (!isMaster) {
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return;
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}
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const action = updatePrinters(values(printers));
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emitter.emit('action', action);
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dispatch(action);
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}, 1000);
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