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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.coyote.http2;
import java.io.File;
import java.io.IOException;
import java.util.Iterator;
import org.apache.coyote.AbstractProcessor;
import org.apache.coyote.ActionCode;
import org.apache.coyote.Adapter;
import org.apache.coyote.ContainerThreadMarker;
import org.apache.coyote.ErrorState;
import org.apache.coyote.Request;
import org.apache.coyote.Response;
import org.apache.coyote.http11.filters.GzipOutputFilter;
import org.apache.juli.logging.Log;
import org.apache.juli.logging.LogFactory;
import org.apache.tomcat.util.buf.ByteChunk;
import org.apache.tomcat.util.http.FastHttpDateFormat;
import org.apache.tomcat.util.http.MimeHeaders;
import org.apache.tomcat.util.net.AbstractEndpoint.Handler.SocketState;
import org.apache.tomcat.util.net.DispatchType;
import org.apache.tomcat.util.net.SendfileState;
import org.apache.tomcat.util.net.SocketEvent;
import org.apache.tomcat.util.net.SocketWrapperBase;
import org.apache.tomcat.util.res.StringManager;
class StreamProcessor extends AbstractProcessor {
private static final Log log = LogFactory.getLog(StreamProcessor.class);
private static final StringManager sm = StringManager.getManager(StreamProcessor.class);
private final Http2UpgradeHandler handler;
private final Stream stream;
private SendfileData sendfileData = null;
private SendfileState sendfileState = null;
StreamProcessor(Http2UpgradeHandler handler, Stream stream, Adapter adapter,
SocketWrapperBase socketWrapper) {
super(adapter, stream.getCoyoteRequest(), stream.getCoyoteResponse());
this.handler = handler;
this.stream = stream;
setSocketWrapper(socketWrapper);
}
final void process(SocketEvent event) {
try {
// FIXME: the regular processor syncs on socketWrapper, but here this deadlocks
synchronized (this) {
// HTTP/2 equivalent of AbstractConnectionHandler#process() without the
// socket <-> processor mapping
ContainerThreadMarker.set();
SocketState state = SocketState.CLOSED;
try {
state = process(socketWrapper, event);
if (state == SocketState.CLOSED) {
if (!getErrorState().isConnectionIoAllowed()) {
ConnectionException ce = new ConnectionException(sm.getString(
"streamProcessor.error.connection", stream.getConnectionId(),
stream.getIdentifier()), Http2Error.INTERNAL_ERROR);
stream.close(ce);
} else if (!getErrorState().isIoAllowed()) {
StreamException se = stream.getResetException();
if (se == null) {
se = new StreamException(sm.getString(
"streamProcessor.error.stream", stream.getConnectionId(),
stream.getIdentifier()), Http2Error.INTERNAL_ERROR,
stream.getIdAsInt());
}
stream.close(se);
}
}
} catch (Exception e) {
String msg = sm.getString("streamProcessor.error.connection",
stream.getConnectionId(), stream.getIdentifier());
if (log.isDebugEnabled()) {
log.debug(msg, e);
}
ConnectionException ce = new ConnectionException(msg, Http2Error.INTERNAL_ERROR);
ce.initCause(e);
stream.close(ce);
} finally {
ContainerThreadMarker.clear();
}
}
} finally {
handler.executeQueuedStream();
}
}
@Override
protected final void prepareResponse() throws IOException {
response.setCommitted(true);
if (handler.hasAsyncIO() && handler.getProtocol().getUseSendfile()) {
prepareSendfile();
}
prepareHeaders(request, response, sendfileData == null, handler.getProtocol(), stream);
stream.writeHeaders();
}
private void prepareSendfile() {
String fileName = (String) stream.getCoyoteRequest().getAttribute(
org.apache.coyote.Constants.SENDFILE_FILENAME_ATTR);
if (fileName != null) {
sendfileData = new SendfileData();
sendfileData.path = new File(fileName).toPath();
sendfileData.pos = ((Long) stream.getCoyoteRequest().getAttribute(
org.apache.coyote.Constants.SENDFILE_FILE_START_ATTR)).longValue();
sendfileData.end = ((Long) stream.getCoyoteRequest().getAttribute(
org.apache.coyote.Constants.SENDFILE_FILE_END_ATTR)).longValue();
sendfileData.left = sendfileData.end - sendfileData.pos;
sendfileData.stream = stream;
}
}
// Static so it can be used by Stream to build the MimeHeaders required for
// an ACK. For that use case coyoteRequest, protocol and stream will be null.
static void prepareHeaders(Request coyoteRequest, Response coyoteResponse, boolean noSendfile,
Http2Protocol protocol, Stream stream) {
MimeHeaders headers = coyoteResponse.getMimeHeaders();
int statusCode = coyoteResponse.getStatus();
// Add the pseudo header for status
headers.addValue(":status").setString(Integer.toString(statusCode));
// Check to see if a response body is present
if (!(statusCode < 200 || statusCode == 204 || statusCode == 205 || statusCode == 304)) {
String contentType = coyoteResponse.getContentType();
if (contentType != null) {
headers.setValue("content-type").setString(contentType);
}
String contentLanguage = coyoteResponse.getContentLanguage();
if (contentLanguage != null) {
headers.setValue("content-language").setString(contentLanguage);
}
// Add a content-length header if a content length has been set unless
// the application has already added one
long contentLength = coyoteResponse.getContentLengthLong();
if (contentLength != -1 && headers.getValue("content-length") == null) {
headers.addValue("content-length").setLong(contentLength);
}
} else {
if (statusCode == 205) {
// RFC 7231 requires the server to explicitly signal an empty
// response in this case
coyoteResponse.setContentLength(0);
} else {
coyoteResponse.setContentLength(-1);
}
}
// Add date header unless it is an informational response or the
// application has already set one
if (statusCode >= 200 && headers.getValue("date") == null) {
headers.addValue("date").setString(FastHttpDateFormat.getCurrentDate());
}
// Compression can't be used with sendfile
if (noSendfile && protocol != null &&
protocol.useCompression(coyoteRequest, coyoteResponse)) {
// Enable compression. Headers will have been set. Need to configure
// output filter at this point.
stream.addOutputFilter(new GzipOutputFilter());
}
}
@Override
protected final void finishResponse() throws IOException {
sendfileState = handler.processSendfile(sendfileData);
if (!(sendfileState == SendfileState.PENDING)) {
stream.getOutputBuffer().end();
}
}
@Override
protected final void ack() {
if (!response.isCommitted() && request.hasExpectation()) {
try {
stream.writeAck();
} catch (IOException ioe) {
setErrorState(ErrorState.CLOSE_CONNECTION_NOW, ioe);
}
}
}
@Override
protected final void flush() throws IOException {
stream.getOutputBuffer().flush();
}
@Override
protected final int available(boolean doRead) {
return stream.getInputBuffer().available();
}
@Override
protected final void setRequestBody(ByteChunk body) {
stream.getInputBuffer().insertReplayedBody(body);
try {
stream.receivedEndOfStream();
} catch (ConnectionException e) {
// Exception will not be thrown in this case
}
}
@Override
protected final void setSwallowResponse() {
// NO-OP
}
@Override
protected final void disableSwallowRequest() {
// NO-OP
// HTTP/2 has to swallow any input received to ensure that the flow
// control windows are correctly tracked.
}
@Override
protected void processSocketEvent(SocketEvent event, boolean dispatch) {
if (dispatch) {
handler.processStreamOnContainerThread(this, event);
} else {
this.process(event);
}
}
@Override
protected final boolean isReadyForRead() {
return stream.getInputBuffer().isReadyForRead();
}
@Override
protected final boolean isRequestBodyFullyRead() {
return stream.getInputBuffer().isRequestBodyFullyRead();
}
@Override
protected final void registerReadInterest() {
// Should never be called for StreamProcessor as isReadyForRead() is
// overridden
throw new UnsupportedOperationException();
}
@Override
protected final boolean isReadyForWrite() {
return stream.isReadyForWrite();
}
@Override
protected final void executeDispatches() {
Iterator dispatches = getIteratorAndClearDispatches();
/*
* Compare with superclass that uses SocketWrapper
* A sync is not necessary here as the window sizes are updated with
* syncs before the dispatches are executed and it is the window size
* updates that need to be complete before the dispatch executes.
*/
while (dispatches != null && dispatches.hasNext()) {
DispatchType dispatchType = dispatches.next();
/*
* Dispatch on new thread.
* Firstly, this avoids a deadlock on the SocketWrapper as Streams
* being processed by container threads lock the SocketProcessor
* before they lock the SocketWrapper which is the opposite order to
* container threads processing via Http2UpgrageHandler.
* Secondly, this code executes after a Window update has released
* one or more Streams. By dispatching each Stream to a dedicated
* thread, those Streams may progress concurrently.
*/
processSocketEvent(dispatchType.getSocketStatus(), true);
}
}
@Override
protected final boolean isPushSupported() {
return stream.isPushSupported();
}
@Override
protected final void doPush(Request pushTarget) {
try {
stream.push(pushTarget);
} catch (IOException ioe) {
setErrorState(ErrorState.CLOSE_CONNECTION_NOW, ioe);
response.setErrorException(ioe);
}
}
@Override
protected boolean isTrailerFieldsReady() {
return stream.isTrailerFieldsReady();
}
@Override
protected boolean isTrailerFieldsSupported() {
return stream.isTrailerFieldsSupported();
}
@Override
public final void recycle() {
// StreamProcessor instances are not re-used.
// Clear fields that can be cleared to aid GC and trigger NPEs if this
// is reused
setSocketWrapper(null);
}
@Override
protected final Log getLog() {
return log;
}
@Override
public final void pause() {
// NO-OP. Handled by the Http2UpgradeHandler
}
@Override
public final SocketState service(SocketWrapperBase socket) throws IOException {
try {
adapter.service(request, response);
} catch (Exception e) {
if (log.isDebugEnabled()) {
log.debug(sm.getString("streamProcessor.service.error"), e);
}
response.setStatus(500);
setErrorState(ErrorState.CLOSE_NOW, e);
}
if (!isAsync()) {
// If this is an async request then the request ends when it has
// been completed. The AsyncContext is responsible for calling
// endRequest() in that case.
endRequest();
}
if (sendfileState == SendfileState.PENDING) {
return SocketState.SENDFILE;
} else if (getErrorState().isError()) {
action(ActionCode.CLOSE, null);
request.updateCounters();
return SocketState.CLOSED;
} else if (isAsync()) {
return SocketState.LONG;
} else {
action(ActionCode.CLOSE, null);
request.updateCounters();
return SocketState.CLOSED;
}
}
@Override
protected final boolean flushBufferedWrite() throws IOException {
if (log.isDebugEnabled()) {
log.debug(sm.getString("streamProcessor.flushBufferedWrite.entry",
stream.getConnectionId(), stream.getIdentifier()));
}
if (stream.flush(false)) {
// The buffer wasn't fully flushed so re-register the
// stream for write. Note this does not go via the
// Response since the write registration state at
// that level should remain unchanged. Once the buffer
// has been emptied then the code below will call
// dispatch() which will enable the
// Response to respond to this event.
if (stream.isReadyForWrite()) {
// Unexpected
throw new IllegalStateException();
}
return true;
}
return false;
}
@Override
protected final SocketState dispatchEndRequest() throws IOException {
endRequest();
return SocketState.CLOSED;
}
private void endRequest() throws IOException {
if (!stream.isInputFinished() && getErrorState().isIoAllowed()) {
if (handler.hasAsyncIO() && !stream.isContentLengthInconsistent()) {
// Need an additional checks for asyncIO as the end of stream
// might have been set on the header frame but not processed
// yet. Checking for this here so the extra processing only
// occurs on the potential error condition rather than on every
// request.
return;
}
// The request has been processed but the request body has not been
// fully read. This typically occurs when Tomcat rejects an upload
// of some form (e.g. PUT or POST). Need to tell the client not to
// send any more data but only if a reset has not already been
// triggered.
StreamException se = new StreamException(
sm.getString("streamProcessor.cancel", stream.getConnectionId(),
stream.getIdentifier()), Http2Error.CANCEL, stream.getIdAsInt());
handler.sendStreamReset(se);
}
}
}
