77 lines
2.2 KiB
JavaScript
77 lines
2.2 KiB
JavaScript
// load configs and spaces
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const config = require("./config.json");
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const spaces = require("./spaces.json");
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// load modules
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const { setInterval } = require("node:timers/promises");
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const fetch = require("node-fetch");
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const express = require("express");
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const { graphqlHTTP } = require('express-graphql');
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const { buildSchema } = require('graphql');
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const NodeCache = require("node-cache");
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const jp = require('jsonpath');
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const { PrismaClient } = require('@prisma/client');
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const prisma = new PrismaClient();
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// set up things
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const cache = new NodeCache({ stdTTL: config.checkperiod * 3 });
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let schema = buildSchema(`
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type Query {
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isOpen(id: String): Boolean
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}
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`);
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let root = {
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sisOpen({ id }) {
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let open = cache.get(id);
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return { open };
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}
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};
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let app = express();
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app.use('/graphql', graphqlHTTP({
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schema: schema,
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rootValue: root,
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graphiql: true,
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}));
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app.listen(4000);
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// CHECK LOOP
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(async function () {
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for await (const time of setInterval(config.checkperiod * 10)) {
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console.log("Checking for spaces...");
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for (const space of spaces) {
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console.log(`Checking ${space.id}...`);
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let o = await checkSpace(space);
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console.log(`Space ${space.id} is ${o ? "open" : "closed"}`);
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if (o !== cache.get(space.id)) {
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cache.set(space.id, o);
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let update = await prisma.space.upsert({
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where: { id: space.id },
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update: { open: o },
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create: { id: space.id, open: o }
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});
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}
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}
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}
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})();
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// HELPER FUNCTIONS
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async function checkSpace(space) {
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let response, data, open;
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try {
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response = await fetch(space.endpoint);
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data = await response.json();
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} catch (e) { console.error(`The space ${space.id} might not be reachable. Please check the endpoint. Error: ${e}`); }
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if (!space.path) {
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try { open = data.state.open; }
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catch { console.error(`The space ${space.id} is not using the SpaceAPI standard. Please specify a path.`); }
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} else {
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try { open = (jp.query(data, space.path) == (space.expected ? space.expected : true)); }
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catch { console.error(`The space ${space.id} has an invalid JSONPath to the target value. Please use https://jsonpath.com/ to evaluate the path.`); }
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}
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return open;
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} |