added a home screen to jank client

stats.js

@@ -0,0 +1,142 @@
+const index = require('./index.js');
+const fs=require("fs");
+let uptimeObject={};
+if(fs.existsSync("./uptime.json")){
+    try{
+        uptimeObject=JSON.parse(fs.readFileSync('./uptime.json', 'utf8'));
+    }catch{
+        uptimeObject={};
+    }
+}
+
+async function observe(instances){
+    const active=new Set();
+    async function resolveinstance(instance){
+        calcStats(instance);
+        let api;
+        if(instance.urls){
+            api=instance.urls.api;
+        }else if(instance.url){
+            const urls=await index.getapiurls(instance.url);
+            if(urls){
+                api=urls.api;
+            }
+        }
+        if(!api||api===""){
+
+            setSatus(instance,false);
+            console.warn(instance.name+" does not resolve api URL");
+            setTimeout(_=>{resolveinstance(instance)},1000*60*30,);
+            return
+        }
+        active.add(instance.name);
+        api+=api.endsWith("/")?"":"/"
+        function check(){
+            fetch(api+"ping").then(_=>{
+                setSatus(instance,_.ok);
+            })
+        }
+        setTimeout(
+            _=>{
+                check();
+                setInterval(_=>{
+                    check();
+                },1000*60*30)
+            },Math.random()*1000*60*10
+        )
+    }
+    const promlist=[];
+    for(const instance of instances){
+        promlist.push(resolveinstance(instance));
+    }
+    await Promise.allSettled(promlist);
+    for(const key of Object.keys(uptimeObject)){
+        if(!active.has(key)){
+            setSatus(key,false);
+        }
+    }
+}
+function calcStats(instance){
+    let obj=uptimeObject[instance.name];
+    if(!obj) return;
+    const day=Date.now()-1000*60*60*24;
+    const week=Date.now()-1000*60*60*24*7;
+    let alltime=-1;
+    let totalTimePassed=0;
+    let laststamp=0;
+    let daytime=-1;
+    let weektime=-1;
+    let online=false;
+    for(const thing of obj){
+        const stamp=thing.time;
+        if(alltime===-1){
+            laststamp=stamp;
+            alltime=0;
+        }
+        const timepassed=stamp-laststamp;
+        totalTimePassed+=timepassed;
+        alltime+=online*timepassed;
+        if(stamp>week){
+            if(weektime===-1){
+                weektime=online*(stamp-week);
+            }else{
+                weektime+=online*timepassed;
+            }
+            if(stamp>day){
+                if(daytime===-1){
+                    daytime=online*(stamp-day);
+                }else{
+                    daytime+=online*timepassed;
+                }
+            }
+        }
+        online=thing.online;
+    }
+    instance.online=online;
+    const timepassed=Date.now()-laststamp;
+    totalTimePassed+=timepassed;
+    daytime+=online*timepassed;
+    weektime+=online*timepassed;
+    alltime+=online*timepassed;
+    alltime/=totalTimePassed;
+    if(timepassed>1000*60*60*24){
+        daytime/=1000*60*60*24;
+        if(timepassed>1000*60*60*24*7){
+            weektime/=1000*60*60*24*7;
+        }else{
+            weektime=alltime;
+        }
+    }else{
+        weektime=alltime
+        daytime=alltime;
+    }
+    instance.uptime={daytime,weektime,alltime}
+}
+/**
+ * @param {string} name
+ * @param {boolean} status
+ */
+function setSatus(instance,status){
+    const name=instance.name;
+    let obj=uptimeObject[name];
+    let needSetting=false;
+    if(!obj){
+        obj=[];
+        uptimeObject[name]=obj;
+        needSetting=true;
+    }else{
+        if(obj[obj.length-1].online!==status){
+            needSetting=true;
+        }
+    }
+    if(needSetting){
+        obj.push({time:Date.now(),online:status});
+        updatejson();
+    }
+    calcStats(instance);
+}
+function updatejson(){
+    fs.writeFile('./uptime.json',JSON.stringify(uptimeObject),_=>{});
+}
+exports.observe=observe;
+exports.uptime=uptimeObject;