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server.ts
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server.ts
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import express from 'express';
import http from 'http';
import socketio from 'socket.io';
import jsonfile from 'jsonfile';
import fs from 'fs';
import os from 'os';
import apiVals, { SongLineAction } from './lib/apiValues';
import Song from './lib/song';
import _ from 'lodash';
import { LocalDateTime } from 'js-joda';
import path from 'path';
import { promisify } from 'util';
const dataDir = path.resolve(__dirname, 'data');
const songsPath = path.resolve(dataDir, 'songs.json');
const songsShownLogPath = path.resolve(dataDir, 'songsShown.log');
const currentSongsPath = path.resolve(dataDir, 'currentSongs.json');
const ccliLicensePath = path.resolve(dataDir, 'ccli.json');
const readJsonFile = promisify(jsonfile.readFile);
const writeJsonFile = promisify(jsonfile.writeFile);
(async function() {
const [allSongs, ccliLicense, currentSongs] = await Promise.all([
getAllSongs(),
getCcliLicense(),
getPersistedCurrentSongs()
]);
const app = getExpressRoutes(ccliLicense, allSongs);
const server = http.createServer(app);
setupSocketIoHandlers(socketio(server), currentSongs, allSongs);
startServer(server);
})().catch(e => logError('ERROR', e));
async function getAllSongs() {
return await (readJsonFile(songsPath)) as Song[];
}
async function getCcliLicense() {
const ccliObj = await readJsonFile(ccliLicensePath);
const ccliLicense = typeof ccliObj === 'number' && ccliObj > 0 ? ccliObj : false;
return ccliLicense;
}
async function getPersistedCurrentSongs(): Promise<CurrentSongs> {
if (await promisify(fs.exists)(currentSongsPath)) {
const { songIds, songLineAction, songLineRef } = await readJsonFile(currentSongsPath);
const validSongIds = Array.isArray(songIds) && songIds.every(val => typeof val === 'number');
const validLineAction = songLineAction === apiVals.select || songLineAction === apiVals.unselect || songLineAction === null;
const validLineRef = songLineRef === null || Array.isArray(songLineRef);
if (validSongIds && validLineAction && validLineRef) {
return { songIds, songLineAction, songLineRef, };
}
}
return {
songIds: [],
songLineAction: null,
songLineRef: null
};
}
function getExpressRoutes(ccliLicense: number | boolean, allSongs: Song[]) {
const app = express();
app.get(apiVals.ccli, function (_req, res) {
res.json(ccliLicense);
});
app.get(apiVals.songsJson, function (_req, res) {
res.json(allSongs);
});
app.use('/data', express.static(__dirname + '/data'));
app.use(express.static(__dirname + '/dist'));
return app;
}
function setupSocketIoHandlers(io: socketio.Server, currentSongs: CurrentSongs, allSongs: Song[]) {
io.on('connection', client => {
console.log(`client ${client.id} connected`);
client.on(apiVals.songs_ready, () => {
console.log(`received ${apiVals.songs_ready}`);
client.emit(apiVals.songs_change, currentSongs.songIds);
sendSongLine();
});
client.on(apiVals.songLine_ready, () => {
console.log('received ' + apiVals.songLine_ready);
sendSongLine();
});
function sendSongLine() {
if (currentSongs.songLineAction && currentSongs.songLineRef) {
console.log(`sending ${apiVals.songLine}:${currentSongs.songLineAction}`, currentSongs.songLineRef);
client.emit(`${apiVals.songLine}:${currentSongs.songLineAction}`, ...currentSongs.songLineRef);
}
}
client.on(apiVals.songs_change, (songIds: number[]) => {
console.log(`echo ${apiVals.songs_change}`, songIds);
io.emit(apiVals.songs_change, songIds);
currentSongs.songIds = songIds;
currentSongs.songLineAction = currentSongs.songLineRef = null;
persistCurrentSongs(currentSongs);
});
([apiVals.select, apiVals.unselect] as SongLineAction[]).forEach(action => {
const event = `${apiVals.songLine}:${action}`;
client.on(event, (song: number, stanza: number, line: number) => {
console.log(`echo ${event}`, { song, stanza, line });
io.emit(event, song, stanza, line);
currentSongs.songLineAction = action;
currentSongs.songLineRef = [song, stanza, line];
if (action === 'select') {
logSongShown(allSongs, currentSongs.songIds[song]);
}
persistCurrentSongs(currentSongs);
});
});
client.on('disconnect', reason => console.log(`client ${client.id} disconnected: ${reason}`));
});
}
function startServer(server: http.Server) {
const port = 8080;
server.listen(port, () => {
const addresses: string[] = [];
Object.values(os.networkInterfaces()).forEach(interfaces => {
interfaces
.filter(iface => iface.family === 'IPv4' && iface.internal === false)
.forEach(iface => addresses.push(`http://${iface.address}:${port}`));
});
console.log(`Listening on ${addresses.join('\n ')}\n`);
});
}
function persistCurrentSongs(currentSongs: CurrentSongs) {
writeJsonFile(currentSongsPath, currentSongs).catch(err => logError('Error persisting song data', err));
}
const loggedSongIds = new Set<number>();
function logSongShown(allSongs: Song[], songId: number) {
if (!loggedSongIds.has(songId)) {
loggedSongIds.add(songId);
const { title, ccliSongNumber, majestyNumber, stanzas, author, copyright } = allSongs[songId - 1];
const logEntry = JSON.stringify({
dateTime: LocalDateTime.now().toString(),
majestyNumber,
scripture: (author as any).scriptureRef,
title,
ccliSongNumber,
copyright,
firstLine: _.get(stanzas, '[0]', { lines: [] }).lines[0]
});
console.log('logging song shown', logEntry);
promisify(fs.writeFile)(songsShownLogPath, logEntry + '\n', { flag: 'a' }).catch(err => logError('Error logging song shown', err));
}
}
function logError(message: string, error: any) {
console.error(message, error);
}
interface CurrentSongs {
songIds: number[];
songLineAction: SongLineAction;
songLineRef: [number, number, number] | null;
}