more logging, less server load

app.js

@@ -61,47 +61,58 @@ app.use('/graphql', graphqlHTTP({
 }));
 
 app.listen(config.port || 4000);
+console.log(`Running a GraphQL API server at localhost:${config.port || 4000}/graphql`);
 
 // CHECK LOOP
 (async function () {
   await loop();
   for await (const time of setInterval(config.checkperiod * 1000)) {
-    //console.log("Checking for spaces...");
     await loop();
   }
 })();
 
 async function loop() {
+  console.log(new Date(), "Checking for spaces...");
+  let changecount = 0;
   for (const space of spaces) {
     //console.log(`Checking ${space.id}...`);
-    let o = await checkSpace(space);
+    let response = await checkSpace(space);
     //console.log(`Space ${space.id} is ${o ? "open" : "closed"}`);
-    if (typeof o === "undefined") { continue; }
-    if (o !== cache.get(space.id)) {
-      cache.set(space.id, o);
+    if (typeof response.open === "undefined") {
+      console.error(`The space ${space.id} might not be reachable. Please check the endpoint.`);
+      continue;
+    }
+    if (JSON.stringify(response) != JSON.stringify(cache.get(space.id))) {
+      cache.set(space.id, response);
       let update = await prisma.space.upsert({
         where: { id: space.id },
-        update: { open: o },
-        create: { id: space.id, open: o, name: space.name }
+        update: { open: response.open, lastChange: response.lastchange },
+        create: { id: space.id, open: response.open, lastChange: response.lastchange, name: space.name }
       });
+      changecount++;
     }
   }
+  console.log(new Date(), "Check complete, updated", changecount, "spaces.");
 }
 
 // HELPER FUNCTIONS
 async function checkSpace(space) {
   let response, data, open;
+  let lastchange = null;
   try {
     response = await fetch(space.endpoint);
     data = await response.json();
   } catch (e) { console.error(`The space ${space.id} might not be reachable. Please check the endpoint. Error: ${e}`); }
 
   if (!space.path) {
-    try { open = data.state.open; }
+    try {
+      open = data.state.open;
+      lastchange = new Date(data.state.lastchange*1000);
+    }
     catch { console.error(`The space ${space.id} is not using the SpaceAPI standard. Please specify a path.`); }
   } else {
     try { open = (jp.query(data, space.path) == (space.expected ? space.expected : true)); }
     catch { console.error(`The space ${space.id} has an invalid JSONPath to the target value. Please use https://jsonpath.com/ to evaluate the path.`); }
   }
-  return open;
+  return { open, lastchange };
 }