/*
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neon - Embeddable HTTP Server based on jdk.httpserver
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Copyright (C) 2024 Ulrich Hilger
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU Affero General Public License as
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published by the Free Software Foundation, either version 3 of the
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License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Affero General Public License for more details.
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You should have received a copy of the GNU Affero General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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package de.uhilger.neon;
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import com.google.gson.Gson;
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import com.sun.net.httpserver.Authenticator;
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import com.sun.net.httpserver.HttpContext;
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import com.sun.net.httpserver.HttpHandler;
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import com.sun.net.httpserver.HttpServer;
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import de.uhilger.neon.entity.ContextDescriptor;
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import de.uhilger.neon.entity.NeonDescriptor;
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import de.uhilger.neon.entity.ServerDescriptor;
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import java.io.BufferedReader;
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import java.io.File;
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import java.io.FileReader;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.InputStreamReader;
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import java.lang.reflect.InvocationTargetException;
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import java.lang.reflect.Method;
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import java.net.InetSocketAddress;
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import java.util.ArrayList;
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import java.util.Arrays;
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import java.util.HashMap;
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import java.util.Iterator;
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import java.util.List;
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import java.util.Map;
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import java.util.concurrent.Executors;
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/**
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* Einen Neon-Server aus einer Beschreibungsdatei herstellen
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*
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* Die Werte aus der Beschreibungsdatei werden in die Attribute der HttpContext-Objekte geschrieben,
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* die zu jedem Server eroeffnet werden.
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*
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* Die Entitaeten stehen wie folgt in Beziehung: HttpServer -1:n-> HttpContext -1:1-> HttpHandler
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*
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* Die Factory legt die Kontexte, Handler sowie die Verbindung zu den Actors selbsttaetig an. Alle
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* Parameter aus 'attributes'-Elementen der Beschreibungsdatei werden als Attribute in den
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* HttpContext uebertragen. Deshalb ist es wichtig, dass die Attributnamen eindeutig gewaehlt
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* werden, damit sie sich nicht gegenseitig ueberschreiben.
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*
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* @author Ulrich Hilger
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* @version 1, 6.2.2024
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*/
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public class Factory {
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public Factory() {
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listeners = new ArrayList<>();
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}
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/**
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* Beschreibungsdatei lesen
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*
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* @param file die Datei, die den Server beschreibt
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* @return ein Objekt, das den Server beschreibt
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* @throws IOException wenn die Datei nicht gelesen werden konnte
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*/
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public NeonDescriptor readDescriptor(File file) throws IOException {
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//Logger logger = Logger.getLogger(Factory.class.getName());
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//logger.log(Level.INFO, "reading NeonDescriptor from {0}", file.getAbsolutePath());
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StringBuilder sb = new StringBuilder();
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BufferedReader r = new BufferedReader(new FileReader(file));
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String line = r.readLine();
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while (line != null) {
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sb.append(line);
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line = r.readLine();
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}
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r.close();
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Gson gson = new Gson();
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return gson.fromJson(sb.toString(), NeonDescriptor.class);
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}
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public void runInstance(NeonDescriptor d)
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throws ClassNotFoundException, NoSuchMethodException, InstantiationException,
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IllegalAccessException, IllegalArgumentException, InvocationTargetException, IOException {
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this.runInstance(d, null, new ArrayList<>());
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}
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public void runInstance(NeonDescriptor d, List<String> packageNames)
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throws ClassNotFoundException, NoSuchMethodException, InstantiationException,
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IllegalAccessException, IllegalArgumentException, InvocationTargetException, IOException {
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this.runInstance(d, packageNames, new ArrayList<>());
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}
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/**
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* Einen Neon-Server gemaess einem Serverbeschreibungsobjekt herstellen und starten
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*
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* @param d das Object mit der Serverbeschreibung
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* @param packageNames Namen der Packages, aus der rekursiv vorgefundene Actors eingebaut werden
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* sollen
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* @param sdp die DataProvider fuer diese Neon-Instanz
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* @throws ClassNotFoundException
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* @throws NoSuchMethodException
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* @throws InstantiationException
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* @throws IllegalAccessException
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* @throws IllegalArgumentException
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* @throws InvocationTargetException
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* @throws IOException
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*/
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public void runInstance(NeonDescriptor d, List<String> packageNames, List<DataProvider> sdp)
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throws ClassNotFoundException, NoSuchMethodException, InstantiationException,
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IllegalAccessException, IllegalArgumentException, InvocationTargetException, IOException {
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List serverList = d.server;
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Iterator<ServerDescriptor> serverIterator = serverList.iterator();
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while (serverIterator.hasNext()) {
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ServerDescriptor sd = serverIterator.next();
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HttpServer server = HttpServer.create(new InetSocketAddress(sd.port), 0);
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fireServerCreated(server);
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if(packageNames == null) {
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packageNames = d.actorPackages;
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}
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addContexts(d, server, sd.contexts, packageNames, sdp);
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server.setExecutor(Executors.newFixedThreadPool(10));
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server.start();
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}
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fireInstanceStarted();
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}
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private Authenticator createAuthenticator(NeonDescriptor d) {
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Authenticator auth = null;
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if(d.authenticator != null) {
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try {
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Object authObj = Class.forName(d.authenticator.className)
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.getDeclaredConstructor().newInstance();
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if(authObj instanceof Authenticator) {
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auth = (Authenticator) authObj;
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return auth;
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}
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} catch (ClassNotFoundException | NoSuchMethodException | SecurityException |
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InstantiationException | IllegalAccessException | IllegalArgumentException |
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InvocationTargetException ex) {
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// Klasse nicht gefunden. Muss das geloggt oder sonstwie behandel werden?
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return null;
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}
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}
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return auth;
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}
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private void addContexts(NeonDescriptor d, HttpServer server, List contextList, List<String> packageNames,
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List<DataProvider> sdp)
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throws ClassNotFoundException, NoSuchMethodException, InstantiationException,
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IllegalAccessException, IllegalArgumentException, InvocationTargetException, IOException {
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Map<String, HttpHandler> sharedHandlers = new HashMap();
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Iterator<ContextDescriptor> contextIterator = contextList.iterator();
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while (contextIterator.hasNext()) {
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ContextDescriptor cd = contextIterator.next();
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HttpHandler h = buildHandler(cd, sharedHandlers);
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if (h != null) {
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HttpContext ctx = server.createContext(cd.contextPath, h);
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Map<String, Object> ctxAttrs = ctx.getAttributes();
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/*
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Achtung: Wenn verschiedene Elemente dasselbe Attribut
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deklarieren, ueberschreiben sie sich die Attribute gegenseitig.
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*/
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ctxAttrs.putAll(cd.attributes);
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if (h instanceof Handler) {
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for (String packageName : packageNames) {
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wireActors(
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packageName, Actor.class, (Handler) h,
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cd.attributes.get("contextName"));
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ctx.getAttributes().put("serverDataProviderList", sdp);
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}
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}
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Authenticator auth = createAuthenticator(d);
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if (auth instanceof Authenticator && cd.authenticator instanceof String) {
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ctx.setAuthenticator(auth);
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ctx.getAttributes().putAll(d.authenticator.attributes);
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fireAuthenticatorCreated(ctx, auth);
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}
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fireHandlerCreated(ctx, h);
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fireContextCreated(ctx);
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} else {
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// Handler konnte nicht erstellt werden
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}
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}
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}
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private HttpHandler buildHandler(ContextDescriptor cd, Map<String, HttpHandler> sharedHandlers) throws ClassNotFoundException, NoSuchMethodException, InstantiationException,
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IllegalAccessException, IllegalArgumentException, InvocationTargetException, IOException {
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HttpHandler h;
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if (!cd.sharedHandler) {
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h = getHandlerInstance(cd);
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} else {
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HttpHandler sharedHandler = sharedHandlers.get(cd.attributes.get("contextName"));
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if (sharedHandler instanceof HttpHandler) {
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h = sharedHandler;
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} else {
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h = getHandlerInstance(cd);
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sharedHandlers.put(cd.attributes.get("contextName"), h);
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}
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}
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return h;
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}
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private HttpHandler getHandlerInstance(ContextDescriptor cd) {
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try {
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Object handlerObj = Class.forName(cd.className)
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.getDeclaredConstructor().newInstance();
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if (handlerObj instanceof HttpHandler) {
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return (HttpHandler) handlerObj;
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} else {
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// kein HttpHandler aus newInstance
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return null;
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}
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} catch (ClassNotFoundException | NoSuchMethodException | SecurityException |
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InstantiationException | IllegalAccessException | IllegalArgumentException |
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InvocationTargetException ex) {
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// Klasse nicht gefunden. Muss das geloggt oder sonstwie behandel werden?
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return null;
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}
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}
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private void wireActors(String packageName, Class annotation, Handler h, String contextName) {
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ClassLoader cl = ClassLoader.getSystemClassLoader();
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InputStream stream = cl
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.getResourceAsStream(packageName.replaceAll("[.]", "/"));
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BufferedReader reader = new BufferedReader(new InputStreamReader(stream));
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Iterator i = reader.lines().iterator();
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while (i.hasNext()) {
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String line = i.next().toString();
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if (line.endsWith(".class")) {
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try {
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Class actorClass = Class.forName(packageName + "."
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+ line.substring(0, line.lastIndexOf('.')));
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if (actorClass != null && actorClass.isAnnotationPresent(annotation)) {
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wire(h, actorClass, contextName);
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}
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} catch (ClassNotFoundException ex) {
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// Klasse nicht gefunden. Muss das geloggt oder sonstwie behandel werden?
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}
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} else {
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wireActors(packageName + "." + line, annotation, h, contextName);
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}
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}
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}
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/*
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Eine Action-Annotation enthaelt gewoehnlich die Route,
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die 'unterhalb' des Kontextpfades als 'Ausloeser' zur
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Ausfuehrung der Action verwendet wird.
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Wenn die Action fuer alle Routen 'unterhalb' des
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Kontextpfades ausgefuehrt werden soll, muss die Action
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als Route '/' angeben.
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*/
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private void wire(Handler h, Class c, String contextName) {
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Method[] methods = c.getMethods();
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for (Method method : methods) {
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Action action = method.getAnnotation(Action.class);
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if (action != null) {
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List actionHandlers = Arrays.asList(action.handler());
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if (actionHandlers.contains(contextName)) {
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h.setActor(action.type(), action.route(), c.getName());
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}
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}
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}
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}
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/* -------------- FactoryListener Implementierung --------------- */
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private List<FactoryListener> listeners;
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public void addListener(FactoryListener l) {
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this.listeners.add(l);
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}
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public void removeListener(FactoryListener l) {
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this.listeners.remove(l);
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}
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public void destroy() {
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this.listeners.clear();
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this.listeners = null;
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}
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private void fireServerCreated(HttpServer server) {
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for (FactoryListener l : listeners) {
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l.serverCreated(server);
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}
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}
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private void fireHandlerCreated(HttpContext ctx, HttpHandler h) {
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for (FactoryListener l : listeners) {
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l.handlerCreated(ctx, h);
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}
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}
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private void fireContextCreated(HttpContext context) {
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for (FactoryListener l : listeners) {
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l.contextCreated(context);
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}
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}
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private void fireAuthenticatorCreated(HttpContext context, Authenticator auth) {
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for (FactoryListener l : listeners) {
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l.authenticatorCreated(context, auth);
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}
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}
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private void fireInstanceStarted() {
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for (FactoryListener l : listeners) {
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l.instanceStarted();
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}
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}
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}
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