Initial commit
This commit is contained in:
Aram Chia Sarafian
281
index.js
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281
index.js
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import fetch from 'node-fetch';
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import cron from 'node-cron';
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import fs from 'fs';
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import path from 'path';
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// Configuration
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const CONFIG = {
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API_URL: 'https://gateway.bibliocommons.com/v2/libraries/sandiego/bibs/S161C1805116/availability',
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BRANCH_NAME: 'Rancho Penasquitos',
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NTFY_TOPIC: 'sdparkpass', // Change this to your preferred topic
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NTFY_SERVER: 'https://ntfy.sh', // Change this if using your own ntfy server
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STATE_FILE: path.join(process.cwd(), 'last_availability.json'),
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POLL_INTERVAL: '0 * * * *', // Every hour at minute 0
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USER_AGENT: 'SD Park Pass Monitor/1.0'
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};
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// Merge in any overrides from config.js
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import { CONFIG_OVERRIDE } from './config.js';
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Object.assign(CONFIG, CONFIG_OVERRIDE);
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/**
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* Loads the last known availability count from the state file
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* @returns {number} The last availability count, or 0 if file doesn't exist
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*/
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function loadLastAvailabilityCount() {
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try {
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if (fs.existsSync(CONFIG.STATE_FILE)) {
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const data = JSON.parse(fs.readFileSync(CONFIG.STATE_FILE, 'utf8'));
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return data.availabilityCount || 0;
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}
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} catch (error) {
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console.error('Error reading state file:', error.message);
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}
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return 0;
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}
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/**
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* Saves the current availability count to the state file
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* @param {number} count - The current availability count
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* @param {Object} metadata - Additional metadata to save
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*/
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function saveAvailabilityCount(count, metadata = {}) {
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try {
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const data = {
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availabilityCount: count,
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lastUpdated: new Date().toISOString(),
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...metadata
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};
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fs.writeFileSync(CONFIG.STATE_FILE, JSON.stringify(data, null, 2));
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console.log(`Saved availability count: ${count}`);
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} catch (error) {
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console.error('Error saving state file:', error.message);
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}
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}
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/**
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* Sends a notification via ntfy
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* @param {string} title - Notification title
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* @param {string} message - Notification message
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* @param {string} priority - Priority level (low, default, high)
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*/
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async function sendNotification(title, message, priority = 'default') {
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try {
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const response = await fetch(`${CONFIG.NTFY_SERVER}/${CONFIG.NTFY_TOPIC}`, {
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method: 'POST',
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headers: {
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'Title': title,
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'Priority': priority,
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'Tags': 'park,pass,library',
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'User-Agent': CONFIG.USER_AGENT
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},
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body: message
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});
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if (response.ok) {
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console.log('Notification sent successfully');
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} else {
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console.error('Failed to send notification:', response.status, response.statusText);
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}
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} catch (error) {
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console.error('Error sending notification:', error.message);
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}
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}
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/**
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* Counts available or recently returned items for the specified branch
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* @param {Object} apiResponse - The API response object
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* @returns {number} Count of available/recently returned items
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*/
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function countAvailableItems(apiResponse) {
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try {
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if (!apiResponse?.entities?.bibItems) {
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console.log('No bibItems found in API response');
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return 0;
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}
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let availableCount = 0;
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// Loop through all bibItems in the response
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const bibItems = apiResponse.entities.bibItems;
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for (const itemId in bibItems) {
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const item = bibItems[itemId];
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// Check if this is the Rancho Penasquitos branch
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if (item.branchName?.includes(CONFIG.BRANCH_NAME)) {
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// Check if item is available (statusType is not "UNAVAILABLE")
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if (item.availability?.statusType &&
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item.availability.statusType !== 'UNAVAILABLE') {
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availableCount++;
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console.log(`Found available item at ${CONFIG.BRANCH_NAME}: ${item.availability.statusType} (${item.availability.libraryStatus || 'No status'})`);
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}
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// Also check for items with no dueDate (not checked out)
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else if (item.availability &&
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!item.dueDate &&
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item.branchName.includes(CONFIG.BRANCH_NAME)) {
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availableCount++;
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console.log(`Found available item at ${CONFIG.BRANCH_NAME}: Available (no due date)`);
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}
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}
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}
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return availableCount;
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} catch (error) {
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console.error('Error counting available items:', error.message);
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return 0;
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}
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}
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/**
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* Fetches availability data from the library API
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* @returns {Object|null} The API response or null if failed
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*/
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async function fetchAvailabilityData() {
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try {
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console.log(`Fetching availability data from: ${CONFIG.API_URL}`);
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const response = await fetch(CONFIG.API_URL, {
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headers: {
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'User-Agent': CONFIG.USER_AGENT,
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'Accept': 'application/json'
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}
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});
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if (!response.ok) {
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throw new Error(`HTTP ${response.status}: ${response.statusText}`);
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}
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const data = await response.json();
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console.log('Successfully fetched availability data');
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return data;
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} catch (error) {
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console.error('Error fetching availability data:', error.message);
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return null;
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}
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}
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/**
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* Main monitoring function that checks availability and sends notifications
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*/
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async function checkAvailability() {
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console.log('\n--- Starting availability check ---');
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console.log(`Time: ${new Date().toISOString()}`);
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try {
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// Fetch current availability data
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const apiResponse = await fetchAvailabilityData();
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if (!apiResponse) {
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console.log('Failed to fetch data, skipping this check');
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return;
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}
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// Count currently available items
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const currentCount = countAvailableItems(apiResponse);
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console.log(`Current available items at ${CONFIG.BRANCH_NAME}: ${currentCount}`);
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// Load previous count
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const previousCount = loadLastAvailabilityCount();
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console.log(`Previous available items: ${previousCount}`);
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// Check if availability increased (new items became available)
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if (currentCount > previousCount) {
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const newItems = currentCount - previousCount;
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const title = 'Parking Pass Available!';
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const message = `${newItems} new parking pass(es) became available at ${CONFIG.BRANCH_NAME} branch. Total available: ${currentCount}`;
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console.log(`📢 Sending notification: ${message}`);
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await sendNotification(title, message, 'high');
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} else if (currentCount < previousCount) {
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console.log(`Availability decreased by ${previousCount - currentCount} parking pass(es)`);
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} else {
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console.log('No change in availability');
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}
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// Save current state
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saveAvailabilityCount(currentCount, {
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previousCount,
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branch: CONFIG.BRANCH_NAME,
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apiUrl: CONFIG.API_URL
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});
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} catch (error) {
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console.error('Error in checkAvailability:', error.message);
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// Send error notification
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await sendNotification(
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'SD Park Pass Monitor Error',
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`Error checking availability: ${error.message}`,
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'low'
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);
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}
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console.log('--- Availability check completed ---\n');
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}
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/**
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* Initializes the monitoring service
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*/
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async function initialize() {
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console.log('🚀 SD Park Pass Monitor Starting...');
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console.log(`Monitoring: ${CONFIG.API_URL}`);
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console.log(`Branch: ${CONFIG.BRANCH_NAME}`);
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console.log(`Ntfy Topic: ${CONFIG.NTFY_TOPIC}`);
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console.log(`Poll Interval: ${CONFIG.POLL_INTERVAL}`);
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// Send startup notification
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await sendNotification(
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'SD Park Pass Monitor Started',
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`Now monitoring ${CONFIG.BRANCH_NAME} branch for park pass availability`,
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'low'
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);
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// Run initial check
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console.log('Running initial availability check...');
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await checkAvailability();
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// Schedule hourly checks
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console.log('Setting up hourly monitoring schedule...');
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cron.schedule(CONFIG.POLL_INTERVAL, checkAvailability, {
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scheduled: true,
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timezone: "America/Los_Angeles" // San Diego timezone
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});
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console.log('✅ SD Park Pass Monitor is now running!');
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console.log('Press Ctrl+C to stop the monitor');
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}
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/**
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* Graceful shutdown handler
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*/
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process.on('SIGINT', async () => {
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console.log('\n🛑 Shutting down SD Park Pass Monitor...');
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await sendNotification(
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'SD Park Pass Monitor Stopped',
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'SD Park Pass monitoring has been stopped',
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'low'
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);
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console.log('Goodbye! 👋');
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process.exit(0);
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});
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// Handle uncaught errors
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process.on('uncaughtException', async (error) => {
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console.error('Uncaught Exception:', error);
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await sendNotification(
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'SD Park Pass Monitor Crashed',
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`Critical error: ${error.message}`,
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'high'
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);
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process.exit(1);
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});
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// Start the application
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if (import.meta.url === `file://${process.argv[1]}`) {
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initialize().catch(console.error);
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}
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export { checkAvailability, sendNotification, CONFIG, countAvailableItems, loadLastAvailabilityCount, saveAvailabilityCount };
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