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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.catalina.connector;
import java.io.IOException;
import java.io.Writer;
import java.nio.charset.Charset;
import java.security.AccessController;
import java.security.PrivilegedActionException;
import java.security.PrivilegedExceptionAction;
import java.util.HashMap;
import java.util.Map;
import javax.servlet.WriteListener;
import javax.servlet.http.HttpServletResponse;
import org.apache.catalina.Globals;
import org.apache.coyote.ActionCode;
import org.apache.coyote.Response;
import org.apache.tomcat.util.buf.B2CConverter;
import org.apache.tomcat.util.buf.ByteChunk;
import org.apache.tomcat.util.buf.C2BConverter;
import org.apache.tomcat.util.buf.CharChunk;
import org.apache.tomcat.util.res.StringManager;
/**
* The buffer used by Tomcat response. This is a derivative of the Tomcat 3.3
* OutputBuffer, with the removal of some of the state handling (which in
* Coyote is mostly the Processor's responsibility).
*
* @author Costin Manolache
* @author Remy Maucherat
*/
public class OutputBuffer extends Writer
implements ByteChunk.ByteOutputChannel, CharChunk.CharOutputChannel {
private static final StringManager sm = StringManager.getManager(OutputBuffer.class);
public static final int DEFAULT_BUFFER_SIZE = 8*1024;
/**
* Encoder cache.
*/
private final Map encoders = new HashMap<>();
// ----------------------------------------------------- Instance Variables
/**
* The byte buffer.
*/
private final ByteChunk bb;
/**
* The chunk buffer.
*/
private final CharChunk cb;
/**
* State of the output buffer.
*/
private boolean initial = true;
/**
* Number of bytes written.
*/
private long bytesWritten = 0;
/**
* Number of chars written.
*/
private long charsWritten = 0;
/**
* Flag which indicates if the output buffer is closed.
*/
private volatile boolean closed = false;
/**
* Do a flush on the next operation.
*/
private boolean doFlush = false;
/**
* Byte chunk used to output bytes.
*/
private final ByteChunk outputChunk = new ByteChunk();
/**
* Char chunk used to output chars.
*/
private CharChunk outputCharChunk = new CharChunk();
/**
* Encoding to use.
*/
private String enc;
/**
* Current char to byte converter.
*/
protected C2BConverter conv;
/**
* Associated Coyote response.
*/
private Response coyoteResponse;
/**
* Suspended flag. All output bytes will be swallowed if this is true.
*/
private volatile boolean suspended = false;
// ----------------------------------------------------------- Constructors
/**
* Default constructor. Allocate the buffer with the default buffer size.
*/
public OutputBuffer() {
this(DEFAULT_BUFFER_SIZE);
}
/**
* Alternate constructor which allows specifying the initial buffer size.
*
* @param size Buffer size to use
*/
public OutputBuffer(int size) {
bb = new ByteChunk(size);
bb.setLimit(size);
bb.setByteOutputChannel(this);
cb = new CharChunk(size);
cb.setLimit(size);
cb.setOptimizedWrite(false);
cb.setCharOutputChannel(this);
}
// ------------------------------------------------------------- Properties
/**
* Associated Coyote response.
*
* @param coyoteResponse Associated Coyote response
*/
public void setResponse(Response coyoteResponse) {
this.coyoteResponse = coyoteResponse;
}
/**
* Is the response output suspended ?
*
* @return suspended flag value
*/
public boolean isSuspended() {
return this.suspended;
}
/**
* Set the suspended flag.
*
* @param suspended New suspended flag value
*/
public void setSuspended(boolean suspended) {
this.suspended = suspended;
}
/**
* Is the response output closed ?
*
* @return closed flag value
*/
public boolean isClosed() {
return this.closed;
}
// --------------------------------------------------------- Public Methods
/**
* Recycle the output buffer.
*/
public void recycle() {
initial = true;
bytesWritten = 0;
charsWritten = 0;
bb.recycle();
cb.recycle();
outputCharChunk.setChars(null, 0, 0);
closed = false;
suspended = false;
doFlush = false;
if (conv != null) {
conv.recycle();
conv = null;
}
enc = null;
}
/**
* Close the output buffer. This tries to calculate the response size if
* the response has not been committed yet.
*
* @throws IOException An underlying IOException occurred
*/
@Override
public void close()
throws IOException {
if (closed) {
return;
}
if (suspended) {
return;
}
// If there are chars, flush all of them to the byte buffer now as bytes are used to
// calculate the content-length (if everything fits into the byte buffer, of course).
if (cb.getLength() > 0) {
cb.flushBuffer();
}
if ((!coyoteResponse.isCommitted()) && (coyoteResponse.getContentLengthLong() == -1) &&
!coyoteResponse.getRequest().method().equals("HEAD")) {
// If this didn't cause a commit of the response, the final content
// length can be calculated. Only do this if this is not a HEAD
// request since in that case no body should have been written and
// setting a value of zero here will result in an explicit content
// length of zero being set on the response.
if (!coyoteResponse.isCommitted()) {
coyoteResponse.setContentLength(bb.getLength());
}
}
if (coyoteResponse.getStatus() ==
HttpServletResponse.SC_SWITCHING_PROTOCOLS) {
doFlush(true);
} else {
doFlush(false);
}
closed = true;
// The request should have been completely read by the time the response
// is closed. Further reads of the input a) are pointless and b) really
// confuse AJP (bug 50189) so close the input buffer to prevent them.
Request req = (Request) coyoteResponse.getRequest().getNote(
CoyoteAdapter.ADAPTER_NOTES);
req.inputBuffer.close();
coyoteResponse.action(ActionCode.CLOSE, null);
}
/**
* Flush bytes or chars contained in the buffer.
*
* @throws IOException An underlying IOException occurred
*/
@Override
public void flush() throws IOException {
doFlush(true);
}
/**
* Flush bytes or chars contained in the buffer.
*
* @param realFlush true if this should also cause a real network flush
* @throws IOException An underlying IOException occurred
*/
protected void doFlush(boolean realFlush) throws IOException {
if (suspended) {
return;
}
try {
doFlush = true;
if (initial) {
coyoteResponse.sendHeaders();
initial = false;
}
if (cb.getLength() > 0) {
cb.flushBuffer();
}
if (bb.getLength() > 0) {
bb.flushBuffer();
}
} finally {
doFlush = false;
}
if (realFlush) {
coyoteResponse.action(ActionCode.CLIENT_FLUSH, null);
// If some exception occurred earlier, or if some IOE occurred
// here, notify the servlet with an IOE
if (coyoteResponse.isExceptionPresent()) {
throw new ClientAbortException(coyoteResponse.getErrorException());
}
}
}
// ------------------------------------------------- Bytes Handling Methods
/**
* Sends the buffer data to the client output, checking the
* state of Response and calling the right interceptors.
*
* @param buf Byte buffer to be written to the response
* @param off Offset
* @param cnt Length
*
* @throws IOException An underlying IOException occurred
*/
@Override
public void realWriteBytes(byte buf[], int off, int cnt)
throws IOException {
if (closed) {
return;
}
if (coyoteResponse == null) {
return;
}
// If we really have something to write
if (cnt > 0) {
// real write to the adapter
outputChunk.setBytes(buf, off, cnt);
try {
coyoteResponse.doWrite(outputChunk);
} catch (IOException e) {
// An IOException on a write is almost always due to
// the remote client aborting the request. Wrap this
// so that it can be handled better by the error dispatcher.
throw new ClientAbortException(e);
}
}
}
public void write(byte b[], int off, int len) throws IOException {
if (suspended) {
return;
}
writeBytes(b, off, len);
}
private void writeBytes(byte b[], int off, int len)
throws IOException {
if (closed) {
return;
}
bb.append(b, off, len);
bytesWritten += len;
// if called from within flush(), then immediately flush
// remaining bytes
if (doFlush) {
bb.flushBuffer();
}
}
public void writeByte(int b)
throws IOException {
if (suspended) {
return;
}
bb.append((byte) b);
bytesWritten++;
}
// ------------------------------------------------- Chars Handling Methods
/**
* Convert the chars to bytes, then send the data to the client.
*
* @param buf Char buffer to be written to the response
* @param off Offset
* @param len Length
*
* @throws IOException An underlying IOException occurred
*/
@Override
public void realWriteChars(char buf[], int off, int len)
throws IOException {
outputCharChunk.setChars(buf, off, len);
while (outputCharChunk.getLength() > 0) {
conv.convert(outputCharChunk, bb);
if (bb.getLength() == 0) {
// Break out of the loop if more chars are needed to produce any output
break;
}
if (outputCharChunk.getLength() > 0) {
if (bb.getBuffer().length == bb.getEnd() && bb.getLength() < bb.getLimit()) {
// Need to expand output buffer
bb.makeSpace(outputCharChunk.getLength());
} else {
bb.flushBuffer();
}
}
}
}
@Override
public void write(int c)
throws IOException {
if (suspended) {
return;
}
cb.append((char) c);
charsWritten++;
}
@Override
public void write(char c[])
throws IOException {
if (suspended) {
return;
}
write(c, 0, c.length);
}
@Override
public void write(char c[], int off, int len)
throws IOException {
if (suspended) {
return;
}
cb.append(c, off, len);
charsWritten += len;
}
/**
* Append a string to the buffer
*/
@Override
public void write(String s, int off, int len)
throws IOException {
if (suspended) {
return;
}
if (s == null) {
throw new NullPointerException(sm.getString("outputBuffer.writeNull"));
}
cb.append(s, off, len);
charsWritten += len;
}
@Override
public void write(String s)
throws IOException {
if (suspended) {
return;
}
if (s == null) {
s = "null";
}
cb.append(s);
charsWritten += s.length();
}
public void setEncoding(String s) {
enc = s;
}
public void checkConverter() throws IOException {
if (conv == null) {
setConverter();
}
}
private void setConverter() throws IOException {
if (coyoteResponse != null) {
enc = coyoteResponse.getCharacterEncoding();
}
if (enc == null) {
enc = org.apache.coyote.Constants.DEFAULT_CHARACTER_ENCODING;
}
final Charset charset = getCharset(enc);
conv = encoders.get(charset);
if (conv == null) {
conv = createConverter(charset);
encoders.put(charset, conv);
}
}
private static Charset getCharset(String encoding) throws IOException {
if (Globals.IS_SECURITY_ENABLED) {
try {
return AccessController.doPrivileged(
new PrivilegedExceptionAction() {
@Override
public Charset run() throws IOException {
return B2CConverter.getCharset(encoding);
}
});
} catch (PrivilegedActionException ex) {
Exception e = ex.getException();
if (e instanceof IOException) {
throw (IOException) e;
} else {
throw new IOException(ex);
}
}
} else {
return B2CConverter.getCharset(encoding);
}
}
private static C2BConverter createConverter(Charset charset) throws IOException {
if (Globals.IS_SECURITY_ENABLED){
try {
return AccessController.doPrivileged(
new PrivilegedExceptionAction(){
@Override
public C2BConverter run() throws IOException{
return new C2BConverter(charset);
}
}
);
} catch (PrivilegedActionException ex) {
Exception e = ex.getException();
if (e instanceof IOException) {
throw (IOException) e;
} else {
throw new IOException(ex);
}
}
} else {
return new C2BConverter(charset);
}
}
// -------------------- BufferedOutputStream compatibility
public long getContentWritten() {
return bytesWritten + charsWritten;
}
/**
* Has this buffer been used at all?
*
* @return true if no chars or bytes have been added to the buffer since the
* last call to {@link #recycle()}
*/
public boolean isNew() {
return (bytesWritten == 0) && (charsWritten == 0);
}
public void setBufferSize(int size) {
if (size > bb.getLimit()) {// ??????
bb.setLimit(size);
}
}
public void reset() {
reset(false);
}
public void reset(boolean resetWriterStreamFlags) {
bb.recycle();
cb.recycle();
bytesWritten = 0;
charsWritten = 0;
if (resetWriterStreamFlags) {
if (conv != null) {
conv.recycle();
}
conv = null;
enc = null;
}
initial = true;
}
public int getBufferSize() {
return bb.getLimit();
}
/*
* All the non-blocking write state information is held in the Response so
* it is visible / accessible to all the code that needs it.
*/
public boolean isReady() {
return coyoteResponse.isReady();
}
public void setWriteListener(WriteListener listener) {
coyoteResponse.setWriteListener(listener);
}
public boolean isBlocking() {
return coyoteResponse.getWriteListener() == null;
}
public void checkRegisterForWrite() {
coyoteResponse.checkRegisterForWrite();
}
}
