javascript-2020.github.io/service-worker.js at main · javascript-2020/javascript-2020.github.io · GitHub

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//1
                                                                                console.log('[ sw ]','running');
        var cache_name    = 'runtime-cache-v1';
        var ttl           = 5000;
        var timestamps    = new Map();


        var ext;
        var html_loader;


        self.addEventListener('install',e=>{
                                                                                console.log('[ sw ]','install');
              self.skipWaiting();

        });


        self.addEventListener('activate',e=>{
                                                                                console.log('[ sw ]','activate');
              e.waitUntil((async()=>{

                    var keys    = await caches.keys();
                    await Promise.all(keys.map(key=>{

                          if(key!==cache_name){
                                return caches.delete(key);
                          }

                    }));
                    await cache_purge();
                    self.clients.claim();

              })());

        });


        self.addEventListener('fetch',e=>{
                                                                                console.log('[ sw ]','fetch');
              var {request}   = e;
              if(request.method!=='GET'){
                    return;
              }

              e.respondWith(cache_request(e,request));

        });


        self.addEventListener('message',({data})=>{
                                                                                console.log('[ sw ]','message',data);
              if(data.type=='load')load(data);

        });


  //:


        async function cache_request(e,request){
                                                                                console.log('[ sw ]','cache_request');
              var client;
              var url;
              if(e.clientId){
                    client    = await self.clients.get(e.clientId);
                                                                                //console.log(client);
                    url       = client?.url;
              }
                                                                                console.log('[ sw ]','url',url,request.url);
              var cache     = await caches.open(cache_name);
              var cached    = await cache.match(request);

              if(url){

                    if(url.includes('/html-editor')){

                          var now       = Date.now();
                          var last      = timestamps.get(request.url)||0;

                          if(cached){
                                if(now-last<ttl){
                                                                                console.log('[ sw ]','cache hit');
                                      return cached;
                                }
                                timestamps.delete(request.url);
                                cache.delete(request);
                          }

                    }

              }

              var response    = await fetch(request);

              cache.put(request,response.clone());
              timestamps.set(request.url,now);

              return response;

        }//cache_request


        async function cache_purge(){
                                                                                console.log('[ sw ]','cache_purge');
              var cache   = await caches.open(cache_name);
              var keys    = await cache.keys();
              var now     = Date.now();

              for(var request of keys){

                    var last    = timestamps.get(request.url)||0;
                    if(now-last>ttl){
                          await cache.delete(request);
                          timestamps.delete(request.url);
                    }

              }//for

        }//purge


        function load(data){

        }//load


        function cloud_loader(request){

              var url   = request.url;

              var nodename;
						  var i	=	url.indexOf('?');
						  if(i!=-1){
										nodename		=	url.slice(i+1);
										nodename    = decodeURI(nodename);
										                                                            //df && console.log('url ?',nodename);
						  }

							if(nodename){
							      var txt     = html_loader;
										var i		    =	txt.indexOf('/* params */');
										i			      = txt.indexOf('\n',i)+1;
										txt         =	txt.slice(0,i)+`var nodename='${nodename}';`+txt.slice(i+1);
							}

              var opts        = {};
              var response    = new Response(txt2,opts);
              return response;

        }//cloud_loader