Page Cache

system/PageCache.js

@@ -0,0 +1,65 @@
+"use strict";
+
+const Dragonfly = global.Dragonfly;
+const cl = global.botanLoader;
+
+class PageCache
+{
+	constructor()
+	{
+		this.cache = { };
+		setInterval( () => {
+			var d = new Date().getTime();
+			for( var i in this.cache )
+			{
+				var c = this.cache[ i ];
+				if( c.ttl < d ) delete this.cache[ i ];
+			}
+		}, 30000 );
+	}
+
+	store( req, res, data, ttl )
+	{
+		if( !global.pagecache ) return;
+		var key = req.url;
+
+		var expires = new Date().getTime() + 1000 * ttl;
+
+		this.cache[ key ] = {
+			data: data
+			, headers: {
+				"Content-Length": res.headers[ "Content-Length" ]
+				, "Content-Type": res.headers[ "Content-Type" ]
+				, "X-Cache-Expires": new Date( expires )
+			}
+			, ttl: expires
+		};
+
+		Dragonfly.Debug( "StoreCache: \"" + key + "\", expire " + new Date( expires ) );
+	}
+
+	process( req, res )
+	{
+		var url = req.url;
+		if( url in this.cache )
+		{
+			Dragonfly.Info(
+				"[C] "
+				+ ( req.headers[ "x-forwarded-for" ] || req.connection.remoteAddress ) + " "
+				+ req.method + ": " + encodeURI( url )
+				+ " - " + req.headers["user-agent"]
+				, Dragonfly.Visibility.VISIBLE
+			);
+
+			var c = this.cache[ url ];
+			res.headers = c.headers;
+			res.write( c.data );
+			res.end();
+			return true;
+		}
+
+		return false;
+	}
+}
+
+module.exports = PageCache;