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com.blade.server.netty.RouteMethodHandler Maven / Gradle / Ivy
package com.blade.server.netty;
import com.blade.exception.BladeException;
import com.blade.exception.InternalErrorException;
import com.blade.exception.NotFoundException;
import com.blade.kit.BladeCache;
import com.blade.kit.BladeKit;
import com.blade.kit.ReflectKit;
import com.blade.mvc.Const;
import com.blade.mvc.RouteContext;
import com.blade.mvc.WebContext;
import com.blade.mvc.annotation.JSON;
import com.blade.mvc.annotation.Path;
import com.blade.mvc.handler.RequestHandler;
import com.blade.mvc.handler.RouteHandler;
import com.blade.mvc.handler.RouteHandler0;
import com.blade.mvc.hook.WebHook;
import com.blade.mvc.http.*;
import com.blade.mvc.route.Route;
import com.blade.mvc.route.RouteMatcher;
import com.blade.mvc.ui.ModelAndView;
import com.blade.reflectasm.MethodAccess;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelFutureListener;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.http.*;
import io.netty.handler.codec.http.cookie.Cookie;
import io.netty.handler.stream.ChunkedStream;
import lombok.extern.slf4j.Slf4j;
import java.io.InputStream;
import java.io.StringWriter;
import java.lang.reflect.Method;
import java.nio.charset.StandardCharsets;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
import static com.blade.kit.BladeKit.log404;
import static com.blade.server.netty.HttpConst.CONTENT_LENGTH;
import static com.blade.server.netty.HttpConst.KEEP_ALIVE;
import static io.netty.handler.codec.http.HttpHeaderNames.TRANSFER_ENCODING;
import static io.netty.handler.codec.http.HttpVersion.HTTP_1_1;
/**
* Http Server Handler
*
* @author biezhi
* 2017/5/31
*/
@Slf4j
public class RouteMethodHandler implements RequestHandler {
private final RouteMatcher routeMatcher = WebContext.blade().routeMatcher();
private final boolean hasMiddleware = routeMatcher.getMiddleware().size() > 0;
private final boolean hasBeforeHook = routeMatcher.hasBeforeHook();
private final boolean hasAfterHook = routeMatcher.hasAfterHook();
public void handleResponse(Response response, ChannelHandlerContext context, boolean keepAlive) {
response.body().write(new BodyWriter() {
@Override
public Void onText(StringBody body) {
handleFullResponse(
createFullResponse(response.statusCode(), keepAlive, response.headers(), response.cookiesRaw(), body.content()),
context, keepAlive);
return null;
}
@Override
public Void onStream(StreamBody body) {
handleStreamResponse(response.statusCode(), response.headers(), body.content(), context, keepAlive);
return null;
}
@Override
public Void onView(ViewBody body) {
StringWriter sw = new StringWriter();
try {
WebContext.blade().templateEngine().render(body.modelAndView(), sw);
response.contentType(Const.CONTENT_TYPE_HTML);
handleFullResponse(
createFullResponse(response.statusCode(), keepAlive, response.headers(), response.cookiesRaw(), sw.toString()),
context, keepAlive);
} catch (Exception e) {
log.error("Render view error", e);
}
return null;
}
@Override
public Void onEmpty(EmptyBody emptyBody) {
handleFullResponse(
createFullResponse(response.statusCode(), keepAlive, response.headers(), response.cookiesRaw(), ""),
context, keepAlive);
return null;
}
@Override
public Void onRawBody(RawBody body) {
handleFullResponse(body.httpResponse(), context, keepAlive);
return null;
}
});
}
public void handleFullResponse(FullHttpResponse response, ChannelHandlerContext context, boolean keepAlive) {
if (context.channel().isActive()) {
if (!keepAlive) {
context.write(response).addListener(ChannelFutureListener.CLOSE);
} else {
response.headers().set(HttpConst.CONNECTION, KEEP_ALIVE);
context.write(response, context.voidPromise());
}
context.flush();
}
}
public Map getDefaultHeader(boolean keepAlive) {
Map map = new HashMap<>();
map.put(HttpConst.DATE.toString(), HttpServerInitializer.date.toString());
map.put(HttpConst.X_POWER_BY.toString(), HttpConst.VERSION.toString());
if (keepAlive) {
map.put(HttpConst.CONNECTION.toString(), "keep-alive");
}
return map;
}
public void handleStreamResponse(int status, Map headers, InputStream body,
ChannelHandlerContext context, boolean keepAlive) {
DefaultHttpResponse response = new DefaultHttpResponse(HTTP_1_1, HttpResponseStatus.valueOf(status));
response.headers().set(TRANSFER_ENCODING, HttpHeaderValues.CHUNKED);
headers.forEach((key, value) -> response.headers().set(key, value));
context.write(response);
context.write(new ChunkedStream(body));
ChannelFuture lastContentFuture = context.writeAndFlush(LastHttpContent.EMPTY_LAST_CONTENT);
if (!keepAlive) {
lastContentFuture.addListener(ChannelFutureListener.CLOSE);
}
}
public FullHttpResponse createFullResponse(int status, boolean keepAlive, Map headers, Set cookies, String body) {
headers.putAll(getDefaultHeader(keepAlive));
if (cookies.size() > 0) {
cookies.forEach(cookie -> headers.put(HttpConst.SET_COOKIE.toString(), io.netty.handler.codec.http.cookie.ServerCookieEncoder.LAX.encode(cookie)));
}
FullHttpResponse response = new DefaultFullHttpResponse(
HTTP_1_1, HttpResponseStatus.valueOf(status),
body.isEmpty() ? Unpooled.buffer(0) : Unpooled.wrappedBuffer(body.getBytes(StandardCharsets.UTF_8)));
response.headers().set(CONTENT_LENGTH, response.content().readableBytes());
headers.forEach((key, value) -> response.headers().set(key, value));
return response;
}
/**
* Actual routing method execution
*
* @param context route context
*/
private void routeHandle(RouteContext context) {
Object target = context.routeTarget();
if (null == target) {
Class clazz = context.routeAction().getDeclaringClass();
target = WebContext.blade().getBean(clazz);
context.route().setTarget(target);
}
if (context.targetType() == RouteHandler.class) {
RouteHandler routeHandler = (RouteHandler) target;
routeHandler.handle(context);
} else if (context.targetType() == RouteHandler0.class) {
RouteHandler0 routeHandler = (RouteHandler0) target;
routeHandler.handle(context.request(), context.response());
} else {
Method actionMethod = context.routeAction();
Class returnType = actionMethod.getReturnType();
Path path = target.getClass().getAnnotation(Path.class);
JSON JSON = actionMethod.getAnnotation(JSON.class);
boolean isRestful = (null != JSON) || (null != path && path.restful());
// if request is restful and not InternetExplorer userAgent
if (isRestful) {
if (!context.isIE()) {
context.contentType(Const.CONTENT_TYPE_JSON);
} else {
context.contentType(Const.CONTENT_TYPE_HTML);
}
}
int len = actionMethod.getParameterTypes().length;
MethodAccess methodAccess = BladeCache.getMethodAccess(target.getClass());
Object returnParam = methodAccess.invoke(target, actionMethod.getName(), len > 0 ? context.routeParameters() : null);
if (null == returnParam) {
return;
}
if (isRestful) {
context.json(returnParam);
return;
}
if (returnType == String.class) {
context.body(new ViewBody(new ModelAndView(returnParam.toString())));
return;
}
if (returnType == ModelAndView.class) {
context.body(new ViewBody((ModelAndView) returnParam));
}
}
}
/**
* Invoke WebHook
*
* @param context current execute route handler signature
* @param hookRoute current webhook route handler
* @return Return true then next handler, and else interrupt request
* @throws Exception throw like parse param exception
*/
private boolean invokeHook(RouteContext context, Route hookRoute) throws Exception {
Method hookMethod = hookRoute.getAction();
Object target = hookRoute.getTarget();
if (null == target) {
Class clazz = hookRoute.getAction().getDeclaringClass();
target = WebContext.blade().ioc().getBean(clazz);
hookRoute.setTarget(target);
}
// execute
int len = hookMethod.getParameterTypes().length;
hookMethod.setAccessible(true);
Object returnParam;
if (len > 0) {
if (len == 1) {
MethodAccess methodAccess = BladeCache.getMethodAccess(target.getClass());
returnParam = methodAccess.invoke(target, hookMethod.getName(), context);
} else if (len == 2) {
MethodAccess methodAccess = BladeCache.getMethodAccess(target.getClass());
returnParam = methodAccess.invoke(target, hookMethod.getName(), context.request(), context.response());
} else {
throw new InternalErrorException("Bad web hook structure");
}
} else {
returnParam = ReflectKit.invokeMethod(target, hookMethod);
}
if (null == returnParam) return true;
Class returnType = returnParam.getClass();
if (returnType == Boolean.class || returnType == boolean.class) {
return Boolean.valueOf(returnParam.toString());
}
return true;
}
private boolean invokeMiddleware(List middleware, RouteContext context) throws BladeException {
if (BladeKit.isEmpty(middleware)) {
return true;
}
for (Route route: middleware) {
WebHook webHook = (WebHook) route.getTarget();
boolean flag = webHook.before(context);
if (!flag) return false;
}
return true;
}
/**
* invoke hooks
*
* @param hooks webHook list
* @param context http request
* @return return invoke hook is abort
*/
private boolean invokeHook(List hooks, RouteContext context) throws Exception {
for (Route hook: hooks) {
if (hook.getTargetType() == RouteHandler.class) {
RouteHandler routeHandler = (RouteHandler) hook.getTarget();
routeHandler.handle(context);
} else if (hook.getTargetType() == RouteHandler0.class) {
RouteHandler0 routeHandler = (RouteHandler0) hook.getTarget();
routeHandler.handle(context.request(), context.response());
} else {
boolean flag = this.invokeHook(context, hook);
if (!flag) return false;
}
}
return true;
}
@Override
public void handle(ChannelHandlerContext ctx, Request request, Response response) throws Exception {
RouteContext context = new RouteContext(request, response);
// if execution returns false then execution is interrupted
String uri = context.uri();
boolean keepAlive = context.keepAlive();
Route route = routeMatcher.lookupRoute(context.method(), uri);
if (null == route) {
log404(log, context.method(), context.uri());
throw new NotFoundException(context.uri());
}
// init route, request parameters, route action method and parameter.
context.initRoute(route);
// execution middleware
if (hasMiddleware && !invokeMiddleware(routeMatcher.getMiddleware(), context)) {
context.body(EmptyBody.empty());
handleResponse(context.response(), ctx, keepAlive);
return;
}
context.injectParameters();
// web hook before
if (hasBeforeHook && !invokeHook(routeMatcher.getBefore(uri), context)) {
context.body(EmptyBody.empty());
handleResponse(context.response(), ctx, keepAlive);
return;
}
// execute
this.routeHandle(context);
// webHook
if (hasAfterHook) {
this.invokeHook(routeMatcher.getAfter(uri), context);
}
}
}
