/**
* Handle an HTTP status code or Java exception by forwarding control to the location included in
* the specified errorPage object. It is assumed that the caller has already recorded any request
* attributes that are to be forwarded to this page. Return <code>true</code> if we successfully
* utilized the specified error page location, or <code>false</code> if the default error report
* should be rendered.
*
* @param request The request being processed
* @param response The response being generated
* @param errorPage The errorPage directive we are obeying
*/
private boolean custom(Request request, Response response, ErrorPage errorPage) {
if (container.getLogger().isDebugEnabled())
container.getLogger().debug("Processing " + errorPage);
try {
// Forward control to the specified location
ServletContext servletContext = request.getContext().getServletContext();
RequestDispatcher rd = servletContext.getRequestDispatcher(errorPage.getLocation());
if (response.isCommitted()) {
// Response is committed - including the error page is the
// best we can do
rd.include(request.getRequest(), response.getResponse());
} else {
// Reset the response (keeping the real error code and message)
response.resetBuffer(true);
response.setContentLength(-1);
rd.forward(request.getRequest(), response.getResponse());
// If we forward, the response is suspended again
response.setSuspended(false);
}
// Indicate that we have successfully processed this custom page
return (true);
} catch (Throwable t) {
ExceptionUtils.handleThrowable(t);
// Report our failure to process this custom page
container.getLogger().error("Exception Processing " + errorPage, t);
return (false);
}
}
/**
* Internal method that allows a redirect to be sent with a status other than {@link
* HttpServletResponse#SC_FOUND} (302). No attempt is made to validate the status code.
*/
public void sendRedirect(String location, int status) throws IOException {
if (isCommitted()) {
throw new IllegalStateException(sm.getString("coyoteResponse.sendRedirect.ise"));
}
// Ignore any call from an included servlet
if (included) {
return;
}
// Clear any data content that has been buffered
resetBuffer(true);
// Generate a temporary redirect to the specified location
try {
String absolute = toAbsolute(location);
setStatus(status);
setHeader("Location", absolute);
if (getContext().getSendRedirectBody()) {
PrintWriter writer = getWriter();
writer.print(
sm.getString("coyoteResponse.sendRedirect.note", RequestUtil.filter(absolute)));
flushBuffer();
}
} catch (IllegalArgumentException e) {
setStatus(SC_NOT_FOUND);
}
// Cause the response to be finished (from the application perspective)
setSuspended(true);
}
public void finish() {
if (response == null) {
throw new IllegalStateException(sm.getString("responseFacade.nullResponse"));
}
response.setSuspended(true);
}
@Override
public PrintWriter getWriter() throws IOException {
// if (isFinished())
// throw new IllegalStateException
// (/*sm.getString("responseFacade.finished")*/);
PrintWriter writer = response.getWriter();
if (isFinished()) response.setSuspended(true);
return (writer);
}
@Override
public ServletOutputStream getOutputStream() throws IOException {
// if (isFinished())
// throw new IllegalStateException
// (/*sm.getString("responseFacade.finished")*/);
ServletOutputStream sos = response.getOutputStream();
if (isFinished()) response.setSuspended(true);
return (sos);
}
/**
* Invoke the next Valve in the sequence. When the invoke returns, check the response state, and
* output an error report is necessary.
*
* @param request The servlet request to be processed
* @param response The servlet response to be created
* @exception IOException if an input/output error occurs
* @exception ServletException if a servlet error occurs
*/
@Override
public void invoke(Request request, Response response) throws IOException, ServletException {
// Perform the request
getNext().invoke(request, response);
if (response.isCommitted()) {
return;
}
Throwable throwable = (Throwable) request.getAttribute(RequestDispatcher.ERROR_EXCEPTION);
if (request.isAsyncStarted() && response.getStatus() < 400 && throwable == null) {
return;
}
if (throwable != null) {
// The response is an error
response.setError();
// Reset the response (if possible)
try {
response.reset();
} catch (IllegalStateException e) {
// Ignore
}
response.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
}
response.setSuspended(false);
try {
report(request, response, throwable);
} catch (Throwable tt) {
ExceptionUtils.handleThrowable(tt);
}
if (request.isAsyncStarted()) {
request.getAsyncContext().complete();
}
}
/**
* Send an error response with the specified status and message.
*
* @param status HTTP status code to send
* @param message Corresponding message to send
* @exception IllegalStateException if this response has already been committed
* @exception IOException if an input/output error occurs
*/
@Override
public void sendError(int status, String message) throws IOException {
if (isCommitted()) {
throw new IllegalStateException(sm.getString("coyoteResponse.sendError.ise"));
}
// Ignore any call from an included servlet
if (included) {
return;
}
setError();
coyoteResponse.setStatus(status);
coyoteResponse.setMessage(message);
// Clear any data content that has been buffered
resetBuffer();
// Cause the response to be finished (from the application perspective)
setSuspended(true);
}
/**
* Process Comet event.
*
* @param request Request to be processed
* @param response Response to be produced
* @param event the event
* @exception IOException if an input/output error occurred
* @exception ServletException if a servlet error occurred
*/
@Override
public final void event(Request request, Response response, CometEvent event)
throws IOException, ServletException {
// Select the Context to be used for this Request
Context context = request.getContext();
// Bind the context CL to the current thread
if (context.getLoader() != null) {
// Not started - it should check for availability first
// This should eventually move to Engine, it's generic.
Thread.currentThread().setContextClassLoader(context.getLoader().getClassLoader());
}
// Ask this Context to process this request
context.getPipeline().getFirst().event(request, response, event);
// Error page processing
response.setSuspended(false);
Throwable t = (Throwable) request.getAttribute(RequestDispatcher.ERROR_EXCEPTION);
if (t != null) {
throwable(request, response, t);
} else {
status(request, response);
}
// Access a session (if present) to update last accessed time, based on a
// strict interpretation of the specification
if (ACCESS_SESSION) {
request.getSession(false);
}
// Restore the context classloader
Thread.currentThread().setContextClassLoader(StandardHostValve.class.getClassLoader());
}
@Override
public boolean asyncDispatch(
org.apache.coyote.Request req, org.apache.coyote.Response res, SocketStatus status)
throws Exception {
Request request = (Request) req.getNote(ADAPTER_NOTES);
Response response = (Response) res.getNote(ADAPTER_NOTES);
if (request == null) {
throw new IllegalStateException("Dispatch may only happen on an existing request.");
}
boolean comet = false;
boolean success = true;
AsyncContextImpl asyncConImpl = (AsyncContextImpl) request.getAsyncContext();
req.getRequestProcessor().setWorkerThreadName(Thread.currentThread().getName());
try {
if (!request.isAsync() && !comet) {
// Error or timeout - need to tell listeners the request is over
// Have to test this first since state may change while in this
// method and this is only required if entering this method in
// this state
Context ctxt = (Context) request.getMappingData().context;
if (ctxt != null) {
ctxt.fireRequestDestroyEvent(request);
}
// Lift any suspension (e.g. if sendError() was used by an async
// request) to allow the response to be written to the client
response.setSuspended(false);
}
if (status == SocketStatus.TIMEOUT) {
if (!asyncConImpl.timeout()) {
asyncConImpl.setErrorState(null, false);
}
}
// Has an error occurred during async processing that needs to be
// processed by the application's error page mechanism (or Tomcat's
// if the application doesn't define one)?
if (!request.isAsyncDispatching() && request.isAsync() && response.isErrorReportRequired()) {
connector.getService().getContainer().getPipeline().getFirst().invoke(request, response);
}
if (request.isAsyncDispatching()) {
connector.getService().getContainer().getPipeline().getFirst().invoke(request, response);
Throwable t = (Throwable) request.getAttribute(RequestDispatcher.ERROR_EXCEPTION);
if (t != null) {
asyncConImpl.setErrorState(t, true);
}
}
if (request.isComet()) {
if (!response.isClosed() && !response.isError()) {
if (request.getAvailable()
|| (request.getContentLength() > 0 && (!request.isParametersParsed()))) {
// Invoke a read event right away if there are available bytes
if (event(req, res, SocketStatus.OPEN_READ)) {
comet = true;
res.action(ActionCode.COMET_BEGIN, null);
}
} else {
comet = true;
res.action(ActionCode.COMET_BEGIN, null);
}
} else {
// Clear the filter chain, as otherwise it will not be reset elsewhere
// since this is a Comet request
request.setFilterChain(null);
}
}
if (!request.isAsync() && !comet) {
request.finishRequest();
response.finishResponse();
req.action(ActionCode.POST_REQUEST, null);
((Context) request.getMappingData().context)
.logAccess(request, response, System.currentTimeMillis() - req.getStartTime(), false);
}
// Check to see if the processor is in an error state. If it is,
// bail out now.
AtomicBoolean error = new AtomicBoolean(false);
res.action(ActionCode.IS_ERROR, error);
if (error.get()) {
success = false;
}
} catch (IOException e) {
success = false;
// Ignore
} catch (Throwable t) {
ExceptionUtils.handleThrowable(t);
success = false;
log.error(sm.getString("coyoteAdapter.service"), t);
} finally {
req.getRequestProcessor().setWorkerThreadName(null);
// Recycle the wrapper request and response
if (!success || (!comet && !request.isAsync())) {
request.recycle();
response.recycle();
} else {
// Clear converters so that the minimum amount of memory
// is used by this processor
request.clearEncoders();
response.clearEncoders();
}
}
return success;
}
/**
* Select the appropriate child Context to process this request, based on the specified request
* URI. If no matching Context can be found, return an appropriate HTTP error.
*
* @param request Request to be processed
* @param response Response to be produced
* @exception IOException if an input/output error occurred
* @exception ServletException if a servlet error occurred
*/
@Override
public final void invoke(Request request, Response response)
throws IOException, ServletException {
/*
* xujb:
* 和Engine一样，调用下层的context，让它来做一些处理
* 自身也处理了一些的逻辑
*
* */
// Select the Context to be used for this Request
Context context = request.getContext();
if (context == null) {
response.sendError(
HttpServletResponse.SC_INTERNAL_SERVER_ERROR, sm.getString("standardHost.noContext"));
return;
}
// Bind the context CL to the current thread
if (context.getLoader() != null) {
// Not started - it should check for availability first
// This should eventually move to Engine, it's generic.
if (Globals.IS_SECURITY_ENABLED) {
PrivilegedAction<Void> pa = new PrivilegedSetTccl(context.getLoader().getClassLoader());
AccessController.doPrivileged(pa);
} else {
Thread.currentThread().setContextClassLoader(context.getLoader().getClassLoader());
}
}
if (request.isAsyncSupported()) {
request.setAsyncSupported(context.getPipeline().isAsyncSupported());
}
boolean asyncAtStart = request.isAsync();
boolean asyncDispatching = request.isAsyncDispatching();
if (asyncAtStart || context.fireRequestInitEvent(request)) {
// Ask this Context to process this request. Requests that are in
// async mode and are not being dispatched to this resource must be
// in error and have been routed here to check for application
// defined error pages.
try {
if (!asyncAtStart || asyncDispatching) {
context.getPipeline().getFirst().invoke(request, response);
} else {
// Make sure this request/response is here because an error
// report is required.
if (!response.isErrorReportRequired()) {
throw new IllegalStateException(sm.getString("standardHost.asyncStateError"));
}
}
} catch (Throwable t) {
ExceptionUtils.handleThrowable(t);
// If a new error occurred while trying to report a previous
// error simply log the new error and allow the original error
// to be reported.
if (response.isErrorReportRequired()) {
container.getLogger().error("Exception Processing " + request.getRequestURI(), t);
} else {
request.setAttribute(RequestDispatcher.ERROR_EXCEPTION, t);
throwable(request, response, t);
}
}
// Now that the request/response pair is back under container
// control lift the suspension so that the error handling can
// complete and/or the container can flush any remaining data
response.setSuspended(false);
Throwable t = (Throwable) request.getAttribute(RequestDispatcher.ERROR_EXCEPTION);
// Protect against NPEs if the context was destroyed during a
// long running request.
if (!context.getState().isAvailable()) {
return;
}
// Look for (and render if found) an application level error page
if (response.isErrorReportRequired()) {
if (t != null) {
throwable(request, response, t);
} else {
status(request, response);
}
}
if (!request.isAsync() && (!asyncAtStart || !response.isErrorReportRequired())) {
context.fireRequestDestroyEvent(request);
}
}
// Access a session (if present) to update last accessed time, based on a
// strict interpretation of the specification
if (ACCESS_SESSION) {
request.getSession(false);
}
// Restore the context classloader
if (Globals.IS_SECURITY_ENABLED) {
PrivilegedAction<Void> pa = new PrivilegedSetTccl(StandardHostValve.class.getClassLoader());
AccessController.doPrivileged(pa);
} else {
Thread.currentThread().setContextClassLoader(StandardHostValve.class.getClassLoader());
}
}