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package org.glassfish.grizzly.http.server;
import java.io.CharConversionException;
import java.io.IOException;
import java.nio.charset.Charset;
import java.util.concurrent.Executor;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.glassfish.grizzly.Connection;
import org.glassfish.grizzly.Grizzly;
import org.glassfish.grizzly.ReadHandler;
import org.glassfish.grizzly.WriteHandler;
import org.glassfish.grizzly.filterchain.FilterChainContext;
import org.glassfish.grizzly.http.HttpRequestPacket;
import org.glassfish.grizzly.http.server.util.DispatcherHelper;
import org.glassfish.grizzly.http.server.util.HtmlHelper;
import org.glassfish.grizzly.http.server.util.MappingData;
import org.glassfish.grizzly.http.util.Header;
import org.glassfish.grizzly.http.util.HttpStatus;
import org.glassfish.grizzly.http.util.RequestURIRef;
import org.glassfish.grizzly.localization.LogMessages;
import org.glassfish.grizzly.utils.Charsets;
/**
* Base class to use when Request/Response/InputStream/OutputStream
* are needed to implement a customized HTTP container/extension to the
* HTTP module.
*
* The {@link HttpHandler} provides developers
* with a simple and consistent mechanism for extending the functionality of the
* HTTP WebServer and for bridging existing HTTP based technology like
* JRuby-on-Rail, Servlet, Bayeux Protocol or any HTTP based protocol.
*
* @author Jeanfrancois Arcand
*/
public abstract class HttpHandler {
private final static Logger LOGGER = Grizzly.logger(HttpHandler.class);
private final static RequestExecutorProvider DEFAULT_REQUEST_EXECUTOR_PROVIDER =
new RequestExecutorProvider.WorkerThreadProvider();
/**
* Allow request that uses encoded slash.
*/
private boolean allowEncodedSlash = false;
/**
* Is the URL decoded
*/
private boolean decodeURL = false;
/**
* Request URI encoding
*/
private Charset requestURIEncoding;
/**
* Are custom status messages (reason phrases) allowed?
*/
private boolean allowCustomStatusMessage = true;
/**
* HttpHandler name
*/
private final String name;
/**
* Create HttpHandler.
*/
public HttpHandler() {
this(null);
}
/**
* Create HttpHandler with the specific name.
* @param name
*/
public HttpHandler(String name) {
this.name = name;
}
/**
* Get the HttpHandler name.
* @return the HttpHandler name.
*/
public String getName() {
return name;
}
/**
* Pre-processes HttpHandler {@link Request} and {@link Response},
* checks the HTTP acknowledgment and decodes URL if required. Then passes
* control to {@link #service(Request, Response)}.
*
* @param request the {@link Request}
* @param response the {@link Response}
*
* @return true if the {@link Request} has already been processed in
* the current {@link Thread}, or false otherwise
* @throws Exception if an error occurs serving a static resource or
* from the invocation of {@link #service(Request, Response)}
*/
boolean doHandle(final Request request, final Response response) throws Exception {
request.setRequestExecutorProvider(getRequestExecutorProvider());
request.setSessionCookieName(getSessionCookieName());
request.setSessionManager(getSessionManager(request));
response.setErrorPageGenerator(getErrorPageGenerator(request));
if (request.requiresAcknowledgement()) {
if (!sendAcknowledgment(request, response)) {
return true;
}
}
try {
final HttpRequestPacket httpRequestPacket = request.getRequest();
final RequestURIRef requestURIRef = httpRequestPacket.getRequestURIRef();
requestURIRef.setDefaultURIEncoding(requestURIEncoding);
if (decodeURL) {
// URI decoding
try {
requestURIRef.getDecodedRequestURIBC(allowEncodedSlash);
} catch (CharConversionException e) {
response.setStatus(HttpStatus.INTERNAL_SERVER_ERROR_500);
response.setDetailMessage("Invalid URI: " + e.getMessage());
return true;
}
}
response.getResponse().setAllowCustomReasonPhrase(
allowCustomStatusMessage);
// Parse request URL and if there is an HTTP session parameter -
// extract it from the request URL and store for future use
request.parseSessionId();
return runService(request, response);
} catch (Exception t) {
LOGGER.log(Level.WARNING,
LogMessages.WARNING_GRIZZLY_HTTP_SERVER_HTTPHANDLER_SERVICE_ERROR(), t);
HtmlHelper.setErrorAndSendErrorPage(request, response,
response.getErrorPageGenerator(),
500, HttpStatus.INTERNAL_SERVER_ERROR_500.getReasonPhrase(),
HttpStatus.INTERNAL_SERVER_ERROR_500.getReasonPhrase(), t);
}
return true;
}
private boolean runService(final Request request, final Response response)
throws Exception {
final Executor threadPool = getRequestExecutorProvider().getExecutor(request);
final HttpServerFilter httpServerFilter = request.getServerFilter();
final Connection connection = request.getContext().getConnection();
if (threadPool == null) {
final SuspendStatus suspendStatus = response.initSuspendStatus();
HttpServerProbeNotifier.notifyBeforeService(
httpServerFilter, connection, request, HttpHandler.this);
service(request, response);
return !suspendStatus.getAndInvalidate();
} else {
final FilterChainContext ctx = request.getContext();
ctx.suspend();
threadPool.execute(new Runnable() {
@Override
public void run() {
final SuspendStatus suspendStatus = response.initSuspendStatus();
boolean wasSuspended = false;
try {
HttpServerProbeNotifier.notifyBeforeService(
httpServerFilter, connection, request,
HttpHandler.this);
service(request, response);
wasSuspended = suspendStatus.getAndInvalidate();
} catch (Throwable e) {
LOGGER.log(Level.FINE, "service exception", e);
if (!response.isCommitted()) {
response.reset();
try {
HtmlHelper.setErrorAndSendErrorPage(
request, response,
response.getErrorPageGenerator(),
500, HttpStatus.INTERNAL_SERVER_ERROR_500.getReasonPhrase(),
HttpStatus.INTERNAL_SERVER_ERROR_500.getReasonPhrase(),
e);
} catch (IOException ignored) {
}
}
} finally {
if (!wasSuspended) {
ctx.resume();
}
}
}
});
return false;
}
}
/**
* This method should contain the logic for any HTTP extension to the
* Grizzly HTTP web server.
* @param request The {@link Request}
* @param response The {@link Response}
*/
public abstract void service(Request request, Response response) throws Exception;
/**
* Called when the {@link HttpHandler}'s
* container is started by invoking {@link HttpServer#start}.
*
* By default, it does nothing.
*/
public void start() {
}
/**
* Invoked when the {@link HttpServer} and may be overridden by custom
* implementations to perform implementation specific resource reclaimation
* tasks.
*
* By default, this method does nothing.
*/
public void destroy() {
}
/**
* Returns true if custom status messages (reason phrases)
* are allowed for this response, or false otherwise.
*
* @return true if custom status messages (reason phrases)
* are allowed for this response, or false otherwise.
*/
public boolean isAllowCustomStatusMessage() {
return allowCustomStatusMessage;
}
/**
* Sets if the custom status messages (reason phrases) are allowed for
* this response.
*
* @param allowCustomStatusMessage true if custom status
* messages (reason phrases) are allowed for this response,
* or false otherwise.
*/
public void setAllowCustomStatusMessage(boolean allowCustomStatusMessage) {
this.allowCustomStatusMessage = allowCustomStatusMessage;
}
/**
* Is HTTP URL request allowed to contains encoded slash.
* @return Is HTTP URL request allowed to contains encoded slash.
*/
public boolean isAllowEncodedSlash() {
return allowEncodedSlash;
}
/**
* When true, URL that contains encoded slash will be allowed. When false,
* the URL will be rejected and considered as an invalid one.
* @param allowEncodedSlash true
*/
public void setAllowEncodedSlash(boolean allowEncodedSlash) {
this.allowEncodedSlash = allowEncodedSlash;
}
/**
* Get the request URI encoding used by this HttpHandler.
* @return the request URI encoding used by this HttpHandler.
*/
public Charset getRequestURIEncoding() {
return requestURIEncoding;
}
/**
* Set the request URI encoding used by this HttpHandler.
* @param requestURIEncoding the request URI encoding used by this HttpHandler.
*/
public void setRequestURIEncoding(final Charset requestURIEncoding) {
this.requestURIEncoding = requestURIEncoding;
}
/**
* Set the request URI encoding used by this HttpHandler.
* @param requestURIEncoding the request URI encoding used by this HttpHandler.
*/
public void setRequestURIEncoding(final String requestURIEncoding) {
this.requestURIEncoding = Charsets.lookupCharset(requestURIEncoding);
}
/**
* @return the {@link RequestExecutorProvider} responsible for executing
* user's code in {@link HttpHandler#service(org.glassfish.grizzly.http.server.Request, org.glassfish.grizzly.http.server.Response)}
* and notifying {@link ReadHandler}, {@link WriteHandler} registered by the user.
*/
public RequestExecutorProvider getRequestExecutorProvider() {
return DEFAULT_REQUEST_EXECUTOR_PROVIDER;
}
/**
* Returns the {@link ErrorPageGenerator}, that might be used
* (if an error occurs) during {@link Request} processing.
*
* @param request {@link Request}
*
* @return the {@link ErrorPageGenerator}, that might be used
* (if an error occurs) during {@link Request} processing
*/
protected ErrorPageGenerator getErrorPageGenerator(final Request request) {
return request.getHttpFilter().getConfiguration().getDefaultErrorPageGenerator();
}
/**
* @return session cookie name, if not set default JSESSIONID name will be used
*/
protected String getSessionCookieName() {
return null;
}
/**
* @param request {@link Request}
*
* @return the {@link SessionManager} to be used. null value implies {@link DefaultSessionManager}
*/
protected SessionManager getSessionManager(final Request request) {
return request.getHttpFilter().getConfiguration().getSessionManager();
}
/**
* The default implementation will acknowledge an Expect: 100-Continue
* with a response line with the status 100 followed by the final response
* to this request.
*
* @param request the {@link Request}.
* @param response the {@link Response}.
*
* @return true if request processing should continue after
* acknowledgment of the expectation, otherwise return false.
*
* @throws IOException if an error occurs sending the acknowledgment.
*/
protected boolean sendAcknowledgment(final Request request,
final Response response)
throws IOException {
if ("100-continue".equalsIgnoreCase(request.getHeader(Header.Expect))) {
response.setStatus(HttpStatus.CONINTUE_100);
response.sendAcknowledgement();
return true;
} else {
response.setStatus(HttpStatus.EXPECTATION_FAILED_417);
return false;
}
}
/**
* Should this class decode the URL
*/
protected void setDecodeUrl(boolean decodeURL){
this.decodeURL = decodeURL;
}
/**
* Utility method to update {@link Request} path values.
*
* @param request
* @param mappingData
*/
protected static void updatePaths(final Request request,
final MappingData mappingData) {
request.setContextPath(mappingData.contextPath.toString());
request.setPathInfo(mappingData.pathInfo.toString());
request.setHttpHandlerPath(mappingData.wrapperPath.toString());
}
protected void setDispatcherHelper(final DispatcherHelper dispatcherHelper) {
}
}
