tomcat9源码阅读2接收http请求
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tomcat9源码阅读2接收http请求
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链接1: https://tomcat.apache.org/tomcat-9.0-doc/architecture/requestProcess/request-process.png.
链接2: https://tomcat.apache.org/tomcat-9.0-doc/architecture/requestProcess/authentication-process.png.
1 Acceptor
1.1 Acceptor主要功能
1.响应服务器的pause和stop。
2.调用endPoint中的connectionLimitLatch，来控制连接的数量
3.调用endPoint，创建socket。调用endPoint，处理socket。调用endPoint，关闭socket。
1.2 Acceptor工作机制
acceptor作为守护线程。在其run方法中，一直循环，通过endPoint.serverSocketAccept()来创建socket，通过endPoint.setSocketOptions()来处理socket，关闭socket。如果接收到pause，则会休眠一阵子。如果收到stop则跳出主循环，结束线程。
下面是主要的run方法
@Override
public void run() {
int errorDelay = 0;
try {
// Loop until we receive a shutdown command
while (!stopCalled) {
// Loop if endpoint is paused
while (endpoint.isPaused() && !stopCalled) {
state = AcceptorState.PAUSED;
try {
Thread.sleep(50);
} catch (InterruptedException e) {
// Ignore
}
}
if (stopCalled) {
break;
}
state = AcceptorState.RUNNING;
try {
//if we have reached max connections, wait
endpoint.countUpOrAwaitConnection();
// Endpoint might have been paused while waiting for latch
// If that is the case, don't accept new connections
if (endpoint.isPaused()) {
continue;
}
U socket = null;
try {
// Accept the next incoming connection from the server
// socket
socket = endpoint.serverSocketAccept();
} catch (Exception ioe) {
// We didn't get a socket
endpoint.countDownConnection();
if (endpoint.isRunning()) {
// Introduce delay if necessary
errorDelay = handleExceptionWithDelay(errorDelay);
// re-throw
throw ioe;
} else {
break;
}
}
// Successful accept, reset the error delay
errorDelay = 0;
// Configure the socket
if (!stopCalled && !endpoint.isPaused()) {
// setSocketOptions() will hand the socket off to
// an appropriate processor if successful
if (!endpoint.setSocketOptions(socket)) {
endpoint.closeSocket(socket);
}
} else {
endpoint.destroySocket(socket);
}
} catch (Throwable t) {
ExceptionUtils.handleThrowable(t);
String msg = sm.getString("endpoint.accept.fail");
// APR specific.
// Could push this down but not sure it is worth the trouble.
if (t instanceof Error) {
Error e = (Error) t;
if (e.getError() == 233) {
// Not an error on HP-UX so log as a warning
// so it can be filtered out on that platform
// See bug 50273
log.warn(msg, t);
} else {
log.error(msg, t);
}
} else {
log.error(msg, t);
}
}
}
} finally {
stopLatch.countDown();
}
state = AcceptorState.ENDED;
}
2 AbstractEndpoint，NioEndpoint
2.1 NioEndpoint主要功能
1.NioEndpoint的poller线程消费acceptor生产的socket将socket包装成socketWrapper，并把socketWrapper扔到线程池中去执行
2.NioEndpoint的线程池执行的时候，通过调用NioEndpoint.SocketProcessor来最终调用AbstractProtocol进一步处理socketWrapper
2.2 NioEndpoint工作机制
1.NioEndpoint.setSocketOptions()：将socket包装成socketWrapper并调用poller.register(socketWrapper)将socketWrapper注册到pooler
2.NioEndpoint.Poller.register(final NioSocketWrapper socketWrapper)：将socketWrapper包装成PollerEvent并调用NioEndpoint.Poller.addEvent(PollerEvent event)将事件加入到事件队列中
3.NioEndpoint.Poller.run()：响应关闭事件。寻循环从事件队列中获取事件，调用NioEndpoint.Poller.events()，判定是否有新的事件，将socketChannel注册到selector上。调用NioEndpoint.Poller.processKey(SelectionKey sk, NioSocketWrapper socketWrapper)进一步处理socketWrapper。调用NioEndpoint.Poller.timeout(int keyCount, boolean hasEvents)判定事件处理是否超时
4.NioEndpoint.Poller.processKey(SelectionKey sk, NioSocketWrapper socketWrapper): 响应关闭事件。根据是读事件还是写事件，最终调用NioEndpoint.processSocket(SocketWrapperBase socketWrapper, SocketEvent event, boolean dispatch)把，socketWrapperf封装成NioEndpoint.SocketProcessor最终提交给先endpoint中的线程池进行处理。
5.线程池执行最重是调用NioEndpoint.SocketProcessor.doRun()方法，等待网络协议握手之后，调用：AbstractProtocol.ConnectionHandler.process(SocketWrapperBase wrapper, SocketEvent status)进一步处理socketWrapper。
@Override
protected boolean setSocketOptions(SocketChannel socket) {
NioSocketWrapper socketWrapper = null;
try {
// Allocate channel and wrapper
NioChannel channel = null;
if (nioChannels != null) {
channel = nioChannels.pop();
}
if (channel == null) {
SocketBufferHandler bufhandler = new SocketBufferHandler(
socketProperties.getAppReadBufSize(),
socketProperties.getAppWriteBufSize(),
socketProperties.getDirectBuffer());
if (isSSLEnabled()) {
channel = new SecureNioChannel(bufhandler, selectorPool, this);
} else {
channel = new NioChannel(bufhandler);
}
}
NioSocketWrapper newWrapper = new NioSocketWrapper(channel, this);
channel.reset(socket, newWrapper);
connections.put(socket, newWrapper);
socketWrapper = newWrapper;
// Set socket properties
// Disable blocking, polling will be used
socket.configureBlocking(false);
socketProperties.setProperties(socket.socket());
socketWrapper.setReadTimeout(getConnectionTimeout());
socketWrapper.setWriteTimeout(getConnectionTimeout());
socketWrapper.setKeepAliveLeft(NioEndpoint.this.getMaxKeepAliveRequests());
poller.register(socketWrapper);
return true;
} catch (Throwable t) {
ExceptionUtils.handleThrowable(t);
try {
log.error(sm.getString("endpoint.socketOptionsError"), t);
} catch (Throwable tt) {
ExceptionUtils.handleThrowable(tt);
}
if (socketWrapper == null) {
destroySocket(socket);
}
}
// Tell to close the socket if needed
return false;
}
/**
* The background thread that adds sockets to the Poller, checks the
* poller for triggered events and hands the associated socket off to an
* appropriate processor as events occur.
*/
@Override
public void run() {
// Loop until destroy() is called
while (true) {
boolean hasEvents = false;
try {
if (!close) {
hasEvents = events();
if (wakeupCounter.getAndSet(-1) > 0) {
// If we are here, means we have other stuff to do
// Do a non blocking select
keyCount = selector.selectNow();
} else {
keyCount = selector.select(selectorTimeout);
}
wakeupCounter.set(0);
}
if (close) {
events();
timeout(0, false);
try {
selector.close();
} catch (IOException ioe) {
log.error(sm.getString("endpoint.nio.selectorCloseFail"), ioe);
}
break;
}
// Either we timed out or we woke up, process events first
if (keyCount == 0) {
hasEvents = (hasEvents | events());
}
} catch (Throwable x) {
ExceptionUtils.handleThrowable(x);
log.error(sm.getString("endpoint.nio.selectorLoopError"), x);
continue;
}
Iterator<SelectionKey> iterator =
keyCount > 0 ? selector.selectedKeys().iterator() : null;
// Walk through the collection of ready keys and dispatch
// any active event.
while (iterator != null && iterator.hasNext()) {
SelectionKey sk = iterator.next();
iterator.remove();
NioSocketWrapper socketWrapper = (NioSocketWrapper) sk.attachment();
// Attachment may be null if another thread has called
// cancelledKey()
if (socketWrapper != null) {
processKey(sk, socketWrapper);
}
}
// Process timeouts
timeout(keyCount,hasEvents);
}
getStopLatch().countDown();
}
protected void processKey(SelectionKey sk, NioSocketWrapper socketWrapper) {
try {
if (close) {
cancelledKey(sk, socketWrapper);
} else if (sk.isValid() && socketWrapper != null) {
if (sk.isReadable() || sk.isWritable()) {
if (socketWrapper.getSendfileData() != null) {
processSendfile(sk, socketWrapper, false);
} else {
unreg(sk, socketWrapper, sk.readyOps());
boolean closeSocket = false;
// Read goes before write
if (sk.isReadable()) {
if (socketWrapper.readOperation != null) {
if (!socketWrapper.readOperation.process()) {
closeSocket = true;
}
} else if (!processSocket(socketWrapper, SocketEvent.OPEN_READ, true)) {
closeSocket = true;
}
}
if (!closeSocket && sk.isWritable()) {
if (socketWrapper.writeOperation != null) {
if (!socketWrapper.writeOperation.process()) {
closeSocket = true;
}
} else if (!processSocket(socketWrapper, SocketEvent.OPEN_WRITE, true)) {
closeSocket = true;
}
}
if (closeSocket) {
cancelledKey(sk, socketWrapper);
}
}
}
} else {
// Invalid key
cancelledKey(sk, socketWrapper);
}
} catch (CancelledKeyException ckx) {
cancelledKey(sk, socketWrapper);
} catch (Throwable t) {
ExceptionUtils.handleThrowable(t);
log.error(sm.getString("endpoint.nio.keyProcessingError"), t);
}
}
public boolean processSocket(SocketWrapperBase<S> socketWrapper,
SocketEvent event, boolean dispatch) {
try {
if (socketWrapper == null) {
return false;
}
SocketProcessorBase<S> sc = null;
if (processorCache != null) {
sc = processorCache.pop();
}
if (sc == null) {
sc = createSocketProcessor(socketWrapper, event);
} else {
sc.reset(socketWrapper, event);
}
Executor executor = getExecutor();
if (dispatch && executor != null) {
executor.execute(sc);
} else {
sc.run();
}
} catch (RejectedExecutionException ree) {
getLog().warn(sm.getString("endpoint.executor.fail", socketWrapper) , ree);
return false;
} catch (Throwable t) {
ExceptionUtils.handleThrowable(t);
// This means we got an OOM or similar creating a thread, or that
// the pool and its queue are full
getLog().error(sm.getString("endpoint.process.fail"), t);
return false;
}
return true;
}
线程池执行：
@Override
protected void doRun() {
/*
* Do not cache and re-use the value of socketWrapper.getSocket() in
* this method. If the socket closes the value will be updated to
* CLOSED_NIO_CHANNEL and the previous value potentially re-used for
* a new connection. That can result in a stale cached value which
* in turn can result in unintentionally closing currently active
* connections.
*/
Poller poller = NioEndpoint.this.poller;
if (poller == null) {
socketWrapper.close();
return;
}
try {
int handshake = -1;
try {
if (socketWrapper.getSocket().isHandshakeComplete()) {
// No TLS handshaking required. Let the handler
// process this socket / event combination.
handshake = 0;
} else if (event == SocketEvent.STOP || event == SocketEvent.DISCONNECT ||
event == SocketEvent.ERROR) {
// Unable to complete the TLS handshake. Treat it as
// if the handshake failed.
handshake = -1;
} else {
handshake = socketWrapper.getSocket().handshake(event == SocketEvent.OPEN_READ, event == SocketEvent.OPEN_WRITE);
// The handshake process reads/writes from/to the
// socket. status may therefore be OPEN_WRITE once
// the handshake completes. However, the handshake
// happens when the socket is opened so the status
// must always be OPEN_READ after it completes. It
// is OK to always set this as it is only used if
// the handshake completes.
event = SocketEvent.OPEN_READ;
}
} catch (IOException x) {
handshake = -1;
if (log.isDebugEnabled()) log.debug("Error during SSL handshake",x);
} catch (CancelledKeyException ckx) {
handshake = -1;
}
if (handshake == 0) {
SocketState state = SocketState.OPEN;
// Process the request from this socket
if (event == null) {
state = getHandler().process(socketWrapper, SocketEvent.OPEN_READ);
} else {
state = getHandler().process(socketWrapper, event);
}
if (state == SocketState.CLOSED) {
poller.cancelledKey(getSelectionKey(), socketWrapper);
}
} else if (handshake == -1 ) {
getHandler().process(socketWrapper, SocketEvent.CONNECT_FAIL);
poller.cancelledKey(getSelectionKey(), socketWrapper);
} else if (handshake == SelectionKey.OP_READ){
socketWrapper.registerReadInterest();
} else if (handshake == SelectionKey.OP_WRITE){
socketWrapper.registerWriteInterest();
}
} catch (CancelledKeyException cx) {
poller.cancelledKey(getSelectionKey(), socketWrapper);
} catch (VirtualMachineError vme) {
ExceptionUtils.handleThrowable(vme);
} catch (Throwable t) {
log.error(sm.getString("endpoint.processing.fail"), t);
poller.cancelledKey(getSelectionKey(), socketWrapper);
} finally {
socketWrapper = null;
event = null;
//return to cache
if (running && !paused && processorCache != null) {
processorCache.push(this);
}
}
}
3 AbstractProtocol，Http11NioProtocol
主要根据不同的协议创建具体的processor，并把socketWrapper交给具体的Processor处理
@Override
public SocketState process(SocketWrapperBase<S> wrapper, SocketEvent status) {
if (getLog().isDebugEnabled()) {
getLog().debug(sm.getString("abstractConnectionHandler.process",
wrapper.getSocket(), status));
}
if (wrapper == null) {
// Nothing to do. Socket has been closed.
return SocketState.CLOSED;
}
S socket = wrapper.getSocket();
Processor processor = (Processor) wrapper.getCurrentProcessor();
if (getLog().isDebugEnabled()) {
getLog().debug(sm.getString("abstractConnectionHandler.connectionsGet",
processor, socket));
}
// Timeouts are calculated on a dedicated thread and then
// dispatched. Because of delays in the dispatch process, the
// timeout may no longer be required. Check here and avoid
// unnecessary processing.
if (SocketEvent.TIMEOUT == status &&
(processor == null ||
!processor.isAsync() && !processor.isUpgrade() ||
processor.isAsync() && !processor.checkAsyncTimeoutGeneration())) {
// This is effectively a NO-OP
return SocketState.OPEN;
}
if (processor != null) {
// Make sure an async timeout doesn't fire
getProtocol().removeWaitingProcessor(processor);
} else if (status == SocketEvent.DISCONNECT || status == SocketEvent.ERROR) {
// Nothing to do. Endpoint requested a close and there is no
// longer a processor associated with this socket.
return SocketState.CLOSED;
}
ContainerThreadMarker.set();
try {
if (processor == null) {
String negotiatedProtocol = wrapper.getNegotiatedProtocol();
// OpenSSL typically returns null whereas JSSE typically
// returns "" when no protocol is negotiated
if (negotiatedProtocol != null && negotiatedProtocol.length() > 0) {
UpgradeProtocol upgradeProtocol = getProtocol().getNegotiatedProtocol(negotiatedProtocol);
if (upgradeProtocol != null) {
processor = upgradeProtocol.getProcessor(wrapper, getProtocol().getAdapter());
if (getLog().isDebugEnabled()) {
getLog().debug(sm.getString("abstractConnectionHandler.processorCreate", processor));
}
} else if (negotiatedProtocol.equals("http/1.1")) {
// Explicitly negotiated the default protocol.
// Obtain a processor below.
} else {
// TODO:
// OpenSSL 1.0.2's ALPN callback doesn't support
// failing the handshake with an error if no
// protocol can be negotiated. Therefore, we need to
// fail the connection here. Once this is fixed,
// replace the code below with the commented out
// block.
if (getLog().isDebugEnabled()) {
getLog().debug(sm.getString("abstractConnectionHandler.negotiatedProcessor.fail",
negotiatedProtocol));
}
return SocketState.CLOSED;
/*
* To replace the code above once OpenSSL 1.1.0 is
* used.
// Failed to create processor. This is a bug.
throw new IllegalStateException(sm.getString(
"abstractConnectionHandler.negotiatedProcessor.fail",
negotiatedProtocol));
*/
}
}
}
if (processor == null) {
processor = recycledProcessors.pop();
if (getLog().isDebugEnabled()) {
getLog().debug(sm.getString("abstractConnectionHandler.processorPop", processor));
}
}
if (processor == null) {
processor = getProtocol().createProcessor();
register(processor);
if (getLog().isDebugEnabled()) {
getLog().debug(sm.getString("abstractConnectionHandler.processorCreate", processor));
}
}
processor.setSslSupport(
wrapper.getSslSupport(getProtocol().getClientCertProvider()));
// Associate the processor with the connection
wrapper.setCurrentProcessor(processor);
SocketState state = SocketState.CLOSED;
do {
state = processor.process(wrapper, status);
if (state == SocketState.UPGRADING) {
// Get the HTTP upgrade handler
UpgradeToken upgradeToken = processor.getUpgradeToken();
// Retrieve leftover input
ByteBuffer leftOverInput = processor.getLeftoverInput();
if (upgradeToken == null) {
// Assume direct HTTP/2 connection
UpgradeProtocol upgradeProtocol = getProtocol().getUpgradeProtocol("h2c");
if (upgradeProtocol != null) {
// Release the Http11 processor to be re-used
release(processor);
// Create the upgrade processor
processor = upgradeProtocol.getProcessor(wrapper, getProtocol().getAdapter());
wrapper.unRead(leftOverInput);
// Associate with the processor with the connection
wrapper.setCurrentProcessor(processor);
} else {
if (getLog().isDebugEnabled()) {
getLog().debug(sm.getString(
"abstractConnectionHandler.negotiatedProcessor.fail",
"h2c"));
}
// Exit loop and trigger appropriate clean-up
state = SocketState.CLOSED;
}
} else {
HttpUpgradeHandler httpUpgradeHandler = upgradeToken.getHttpUpgradeHandler();
// Release the Http11 processor to be re-used
release(processor);
// Create the upgrade processor
processor = getProtocol().createUpgradeProcessor(wrapper, upgradeToken);
if (getLog().isDebugEnabled()) {
getLog().debug(sm.getString("abstractConnectionHandler.upgradeCreate",
processor, wrapper));
}
wrapper.unRead(leftOverInput);
// Associate with the processor with the connection
wrapper.setCurrentProcessor(processor);
// Initialise the upgrade handler (which may trigger
// some IO using the new protocol which is why the lines
// above are necessary)
// This cast should be safe. If it fails the error
// handling for the surrounding try/catch will deal with
// it.
if (upgradeToken.getInstanceManager() == null) {
httpUpgradeHandler.init((WebConnection) processor);
} else {
ClassLoader oldCL = upgradeToken.getContextBind().bind(false, null);
try {
httpUpgradeHandler.init((WebConnection) processor);
} finally {
upgradeToken.getContextBind().unbind(false, oldCL);
}
}
if (httpUpgradeHandler instanceof InternalHttpUpgradeHandler) {
if (((InternalHttpUpgradeHandler) httpUpgradeHandler).hasAsyncIO()) {
// The handler will initiate all further I/O
state = SocketState.UPGRADED;
}
}
}
}
} while ( state == SocketState.UPGRADING);
if (state == SocketState.LONG) {
// In the middle of processing a request/response. Keep the
// socket associated with the processor. Exact requirements
// depend on type of long poll
longPoll(wrapper, processor);
if (processor.isAsync()) {
getProtocol().addWaitingProcessor(processor);
}
} else if (state == SocketState.OPEN) {
// In keep-alive but between requests. OK to recycle
// processor. Continue to poll for the next request.
wrapper.setCurrentProcessor(null);
release(processor);
wrapper.registerReadInterest();
} else if (state == SocketState.SENDFILE) {
// Sendfile in progress. If it fails, the socket will be
// closed. If it works, the socket either be added to the
// poller (or equivalent) to await more data or processed
// if there are any pipe-lined requests remaining.
} else if (state == SocketState.UPGRADED) {
// Don't add sockets back to the poller if this was a
// non-blocking write otherwise the poller may trigger
// multiple read events which may lead to thread starvation
// in the connector. The write() method will add this socket
// to the poller if necessary.
if (status != SocketEvent.OPEN_WRITE) {
longPoll(wrapper, processor);
getProtocol().addWaitingProcessor(processor);
}
} else if (state == SocketState.SUSPENDED) {
// Don't add sockets back to the poller.
// The resumeProcessing() method will add this socket
// to the poller.
} else {
// Connection closed. OK to recycle the processor.
// Processors handling upgrades require additional clean-up
// before release.
wrapper.setCurrentProcessor(null);
if (processor.isUpgrade()) {
UpgradeToken upgradeToken = processor.getUpgradeToken();
HttpUpgradeHandler httpUpgradeHandler = upgradeToken.getHttpUpgradeHandler();
InstanceManager instanceManager = upgradeToken.getInstanceManager();
if (instanceManager == null) {
httpUpgradeHandler.destroy();
} else {
ClassLoader oldCL = upgradeToken.getContextBind().bind(false, null);
try {
httpUpgradeHandler.destroy();
} finally {
try {
instanceManager.destroyInstance(httpUpgradeHandler);
} catch (Throwable e) {
ExceptionUtils.handleThrowable(e);
getLog().error(sm.getString("abstractConnectionHandler.error"), e);
}
upgradeToken.getContextBind().unbind(false, oldCL);
}
}
}
release(processor);
}
return state;
} catch(java.net.SocketException e) {
// SocketExceptions are normal
getLog().debug(sm.getString(
"abstractConnectionHandler.socketexception.debug"), e);
} catch (java.io.IOException e) {
// IOExceptions are normal
getLog().debug(sm.getString(
"abstractConnectionHandler.ioexception.debug"), e);
} catch (ProtocolException e) {
// Protocol exceptions normally mean the client sent invalid or
// incomplete data.
getLog().debug(sm.getString(
"abstractConnectionHandler.protocolexception.debug"), e);
}
// Future developers: if you discover any other
// rare-but-nonfatal exceptions, catch them here, and log as
// above.
catch (OutOfMemoryError oome) {
// Try and handle this here to give Tomcat a chance to close the
// connection and prevent clients waiting until they time out.
// Worst case, it isn't recoverable and the attempt at logging
// will trigger another OOME.
getLog().error(sm.getString("abstractConnectionHandler.oome"), oome);
} catch (Throwable e) {
ExceptionUtils.handleThrowable(e);
// any other exception or error is odd. Here we log it
// with "ERROR" level, so it will show up even on
// less-than-verbose logs.
getLog().error(sm.getString("abstractConnectionHandler.error"), e);
} finally {
ContainerThreadMarker.clear();
}
// Make sure socket/processor is removed from the list of current
// connections
wrapper.setCurrentProcessor(null);
release(processor);
return SocketState.CLOSED;
}
4 AbstractProcessorLight，Http11Processor
1.初步从socketWrapper的缓冲中读取报文。通过Http11InputBuffer.parseRequestLine(boolean keptAlive, int connectionTimeout, int keepAliveTimeout)读取http header的头报文。
2.设计具体的http协议版本
3.设置request的filter
4.把已经解析了httpheader的 request 交个 CoyoteAdapter进一步处理。
@Override
public SocketState process(SocketWrapperBase<?> socketWrapper, SocketEvent status)
throws IOException {
SocketState state = SocketState.CLOSED;
Iterator<DispatchType> dispatches = null;
do {
if (dispatches != null) {
DispatchType nextDispatch = dispatches.next();
if (getLog().isDebugEnabled()) {
getLog().debug("Processing dispatch type: [" + nextDispatch + "]");
}
state = dispatch(nextDispatch.getSocketStatus());
if (!dispatches.hasNext()) {
state = checkForPipelinedData(state, socketWrapper);
}
} else if (status == SocketEvent.DISCONNECT) {
// Do nothing here, just wait for it to get recycled
} else if (isAsync() || isUpgrade() || state == SocketState.ASYNC_END) {
state = dispatch(status);
state = checkForPipelinedData(state, socketWrapper);
} else if (status == SocketEvent.OPEN_WRITE) {
// Extra write event likely after async, ignore
state = SocketState.LONG;
} else if (status == SocketEvent.OPEN_READ) {
state = service(socketWrapper);
} else if (status == SocketEvent.CONNECT_FAIL) {
logAccess(socketWrapper);
} else {
// Default to closing the socket if the SocketEvent passed in
// is not consistent with the current state of the Processor
state = SocketState.CLOSED;
}
if (getLog().isDebugEnabled()) {
getLog().debug("Socket: [" + socketWrapper +
"], Status in: [" + status +
"], State out: [" + state + "]");
}
if (isAsync()) {
state = asyncPostProcess();
if (getLog().isDebugEnabled()) {
getLog().debug("Socket: [" + socketWrapper +
"], State after async post processing: [" + state + "]");
}
}
if (dispatches == null || !dispatches.hasNext()) {
// Only returns non-null iterator if there are
// dispatches to process.
dispatches = getIteratorAndClearDispatches();
}
} while (state == SocketState.ASYNC_END ||
dispatches != null && state != SocketState.CLOSED);
return state;
}
@Override
public SocketState service(SocketWrapperBase<?> socketWrapper)
throws IOException {
RequestInfo rp = request.getRequestProcessor();
rp.setStage(org.apache.coyote.Constants.STAGE_PARSE);
// Setting up the I/O
setSocketWrapper(socketWrapper);
// Flags
keepAlive = true;
openSocket = false;
readComplete = true;
boolean keptAlive = false;
SendfileState sendfileState = SendfileState.DONE;
while (!getErrorState().isError() && keepAlive && !isAsync() && upgradeToken == null &&
sendfileState == SendfileState.DONE && !protocol.isPaused()) {
// Parsing the request header
try {
if (!inputBuffer.parseRequestLine(keptAlive, protocol.getConnectionTimeout(),
protocol.getKeepAliveTimeout())) {
if (inputBuffer.getParsingRequestLinePhase() == -1) {
return SocketState.UPGRADING;
} else if (handleIncompleteRequestLineRead()) {
break;
}
}
// Process the Protocol component of the request line
// Need to know if this is an HTTP 0.9 request before trying to
// parse headers.
prepareRequestProtocol();
if (protocol.isPaused()) {
// 503 - Service unavailable
response.setStatus(503);
setErrorState(ErrorState.CLOSE_CLEAN, null);
} else {
keptAlive = true;
// Set this every time in case limit has been changed via JMX
request.getMimeHeaders().setLimit(protocol.getMaxHeaderCount());
// Don't parse headers for HTTP/0.9
if (!http09 && !inputBuffer.parseHeaders()) {
// We've read part of the request, don't recycle it
// instead associate it with the socket
openSocket = true;
readComplete = false;
break;
}
if (!protocol.getDisableUploadTimeout()) {
socketWrapper.setReadTimeout(protocol.getConnectionUploadTimeout());
}
}
} catch (IOException e) {
if (log.isDebugEnabled()) {
log.debug(sm.getString("http11processor.header.parse"), e);
}
setErrorState(ErrorState.CLOSE_CONNECTION_NOW, e);
break;
} catch (Throwable t) {
ExceptionUtils.handleThrowable(t);
UserDataHelper.Mode logMode = userDataHelper.getNextMode();
if (logMode != null) {
String message = sm.getString("http11processor.header.parse");
switch (logMode) {
case INFO_THEN_DEBUG:
message += sm.getString("http11processor.fallToDebug");
//$FALL-THROUGH$
case INFO:
log.info(message, t);
break;
case DEBUG:
log.debug(message, t);
}
}
// 400 - Bad Request
response.setStatus(400);
setErrorState(ErrorState.CLOSE_CLEAN, t);
}
// Has an upgrade been requested?
if (isConnectionToken(request.getMimeHeaders(), "upgrade")) {
// Check the protocol
String requestedProtocol = request.getHeader("Upgrade");
UpgradeProtocol upgradeProtocol = protocol.getUpgradeProtocol(requestedProtocol);
if (upgradeProtocol != null) {
if (upgradeProtocol.accept(request)) {
response.setStatus(HttpServletResponse.SC_SWITCHING_PROTOCOLS);
response.setHeader("Connection", "Upgrade");
response.setHeader("Upgrade", requestedProtocol);
action(ActionCode.CLOSE, null);
getAdapter().log(request, response, 0);
InternalHttpUpgradeHandler upgradeHandler =
upgradeProtocol.getInternalUpgradeHandler(
socketWrapper, getAdapter(), cloneRequest(request));
UpgradeToken upgradeToken = new UpgradeToken(upgradeHandler, null, null, requestedProtocol);
action(ActionCode.UPGRADE, upgradeToken);
return SocketState.UPGRADING;
}
}
}
if (getErrorState().isIoAllowed()) {
// Setting up filters, and parse some request headers
rp.setStage(org.apache.coyote.Constants.STAGE_PREPARE);
try {
prepareRequest();
} catch (Throwable t) {
ExceptionUtils.handleThrowable(t);
if (log.isDebugEnabled()) {
log.debug(sm.getString("http11processor.request.prepare"), t);
}
// 500 - Internal Server Error
response.setStatus(500);
setErrorState(ErrorState.CLOSE_CLEAN, t);
}
}
int maxKeepAliveRequests = protocol.getMaxKeepAliveRequests();
if (maxKeepAliveRequests == 1) {
keepAlive = false;
} else if (maxKeepAliveRequests > 0 &&
socketWrapper.decrementKeepAlive() <= 0) {
keepAlive = false;
}
// Process the request in the adapter
if (getErrorState().isIoAllowed()) {
try {
rp.setStage(org.apache.coyote.Constants.STAGE_SERVICE);
getAdapter().service(request, response);
// Handle when the response was committed before a serious
// error occurred. Throwing a ServletException should both
// set the status to 500 and set the errorException.
// If we fail here, then the response is likely already
// committed, so we can't try and set headers.
if(keepAlive && !getErrorState().isError() && !isAsync() &&
statusDropsConnection(response.getStatus())) {
setErrorState(ErrorState.CLOSE_CLEAN, null);
}
} catch (InterruptedIOException e) {
setErrorState(ErrorState.CLOSE_CONNECTION_NOW, e);
} catch (HeadersTooLargeException e) {
log.error(sm.getString("http11processor.request.process"), e);
// The response should not have been committed but check it
// anyway to be safe
if (response.isCommitted()) {
setErrorState(ErrorState.CLOSE_NOW, e);
} else {
response.reset();
response.setStatus(500);
setErrorState(ErrorState.CLOSE_CLEAN, e);
response.setHeader("Connection", "close"); // TODO: Remove
}
} catch (Throwable t) {
ExceptionUtils.handleThrowable(t);
log.error(sm.getString("http11processor.request.process"), t);
// 500 - Internal Server Error
response.setStatus(500);
setErrorState(ErrorState.CLOSE_CLEAN, t);
getAdapter().log(request, response, 0);
}
}
// Finish the handling of the request
rp.setStage(org.apache.coyote.Constants.STAGE_ENDINPUT);
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();
}
rp.setStage(org.apache.coyote.Constants.STAGE_ENDOUTPUT);
// If there was an error, make sure the request is counted as
// and error, and update the statistics counter
if (getErrorState().isError()) {
response.setStatus(500);
}
if (!isAsync() || getErrorState().isError()) {
request.updateCounters();
if (getErrorState().isIoAllowed()) {
inputBuffer.nextRequest();
outputBuffer.nextRequest();
}
}
if (!protocol.getDisableUploadTimeout()) {
int connectionTimeout = protocol.getConnectionTimeout();
if(connectionTimeout > 0) {
socketWrapper.setReadTimeout(connectionTimeout);
} else {
socketWrapper.setReadTimeout(0);
}
}
rp.setStage(org.apache.coyote.Constants.STAGE_KEEPALIVE);
sendfileState = processSendfile(socketWrapper);
}
rp.setStage(org.apache.coyote.Constants.STAGE_ENDED);
if (getErrorState().isError() || (protocol.isPaused() && !isAsync())) {
return SocketState.CLOSED;
} else if (isAsync()) {
return SocketState.LONG;
} else if (isUpgrade()) {
return SocketState.UPGRADING;
} else {
if (sendfileState == SendfileState.PENDING) {
return SocketState.SENDFILE;
} else {
if (openSocket) {
if (readComplete) {
return SocketState.OPEN;
} else {
return SocketState.LONG;
}
} else {
return SocketState.CLOSED;
}
}
}
}
private void prepareRequestProtocol() {
MessageBytes protocolMB = request.protocol();
if (protocolMB.equals(Constants.HTTP_11)) {
http09 = false;
http11 = true;
protocolMB.setString(Constants.HTTP_11);
} else if (protocolMB.equals(Constants.HTTP_10)) {
http09 = false;
http11 = false;
keepAlive = false;
protocolMB.setString(Constants.HTTP_10);
} else if (protocolMB.equals("")) {
// HTTP/0.9
http09 = true;
http11 = false;
keepAlive = false;
} else {
// Unsupported protocol
http09 = false;
http11 = false;
// Send 505; Unsupported HTTP version
response.setStatus(505);
setErrorState(ErrorState.CLOSE_CLEAN, null);
if (log.isDebugEnabled()) {
log.debug(sm.getString("http11processor.request.prepare")+
" Unsupported HTTP version \""+protocolMB+"\"");
}
}
/**
* After reading the request headers, we have to setup the request filters.
*/
private void prepareRequest() throws IOException {
contentDelimitation = false;
if (protocol.isSSLEnabled()) {
request.scheme().setString("https");
}
MimeHeaders headers = request.getMimeHeaders();
// Check connection header
MessageBytes connectionValueMB = headers.getValue(Constants.CONNECTION);
if (connectionValueMB != null && !connectionValueMB.isNull()) {
Set<String> tokens = new HashSet<>();
TokenList.parseTokenList(headers.values(Constants.CONNECTION), tokens);
if (tokens.contains(Constants.CLOSE)) {
keepAlive = false;
} else if (tokens.contains(Constants.KEEP_ALIVE_HEADER_VALUE_TOKEN)) {
keepAlive = true;
}
}
if (http11) {
MessageBytes expectMB = headers.getValue("expect");
if (expectMB != null && !expectMB.isNull()) {
if (expectMB.toString().trim().equalsIgnoreCase("100-continue")) {
inputBuffer.setSwallowInput(false);
request.setExpectation(true);
} else {
response.setStatus(HttpServletResponse.SC_EXPECTATION_FAILED);
setErrorState(ErrorState.CLOSE_CLEAN, null);
}
}
}
// Check user-agent header
Pattern restrictedUserAgents = protocol.getRestrictedUserAgentsPattern();
if (restrictedUserAgents != null && (http11 || keepAlive)) {
MessageBytes userAgentValueMB = headers.getValue("user-agent");
// Check in the restricted list, and adjust the http11
// and keepAlive flags accordingly
if(userAgentValueMB != null && !userAgentValueMB.isNull()) {
String userAgentValue = userAgentValueMB.toString();
if (restrictedUserAgents.matcher(userAgentValue).matches()) {
http11 = false;
keepAlive = false;
}
}
}
// Check host header
MessageBytes hostValueMB = null;
try {
hostValueMB = headers.getUniqueValue("host");
} catch (IllegalArgumentException iae) {
// Multiple Host headers are not permitted
badRequest("http11processor.request.multipleHosts");
}
if (http11 && hostValueMB == null) {
badRequest("http11processor.request.noHostHeader");
}
// Check for an absolute-URI less the query string which has already
// been removed during the parsing of the request line
ByteChunk uriBC = request.requestURI().getByteChunk();
byte[] uriB = uriBC.getBytes();
if (uriBC.startsWithIgnoreCase("http", 0)) {
int pos = 4;
// Check for https
if (uriBC.startsWithIgnoreCase("s", pos)) {
pos++;
}
// Next 3 characters must be "://"
if (uriBC.startsWith("://", pos)) {
pos += 3;
int uriBCStart = uriBC.getStart();
// '/' does not appear in the authority so use the first
// instance to split the authority and the path segments
int slashPos = uriBC.indexOf('/', pos);
// '@' in the authority delimits the userinfo
int atPos = uriBC.indexOf('@', pos);
if (slashPos > -1 && atPos > slashPos) {
// First '@' is in the path segments so no userinfo
atPos = -1;
}
if (slashPos == -1) {
slashPos = uriBC.getLength();
// Set URI as "/". Use 6 as it will always be a '/'.
// 01234567
// http://
// https://
request.requestURI().setBytes(uriB, uriBCStart + 6, 1);
} else {
request.requestURI().setBytes(uriB, uriBCStart + slashPos, uriBC.getLength() - slashPos);
}
// Skip any user info
if (atPos != -1) {
// Validate the userinfo
for (; pos < atPos; pos++) {
byte c = uriB[uriBCStart + pos];
if (!HttpParser.isUserInfo(c)) {
// Strictly there needs to be a check for valid %nn
// encoding here but skip it since it will never be
// decoded because the userinfo is ignored
badRequest("http11processor.request.invalidUserInfo");
break;
}
}
// Skip the '@'
pos = atPos + 1;
}
if (http11) {
// Missing host header is illegal but handled above
if (hostValueMB != null) {
// Any host in the request line must be consistent with
// the Host header
if (!hostValueMB.getByteChunk().equals(
uriB, uriBCStart + pos, slashPos - pos)) {
if (protocol.getAllowHostHeaderMismatch()) {
// The requirements of RFC 2616 are being
// applied. If the host header and the request
// line do not agree, the request line takes
// precedence
hostValueMB = headers.setValue("host");
hostValueMB.setBytes(uriB, uriBCStart + pos, slashPos - pos);
} else {
// The requirements of RFC 7230 are being
// applied. If the host header and the request
// line do not agree, trigger a 400 response.
badRequest("http11processor.request.inconsistentHosts");
}
}
}
} else {
// Not HTTP/1.1 - no Host header so generate one since
// Tomcat internals assume it is set
try {
hostValueMB = headers.setValue("host");
hostValueMB.setBytes(uriB, uriBCStart + pos, slashPos - pos);
} catch (IllegalStateException e) {
// Edge case
// If the request has too many headers it won't be
// possible to create the host header. Ignore this as
// processing won't reach the point where the Tomcat
// internals expect there to be a host header.
}
}
} else {
badRequest("http11processor.request.invalidScheme");
}
}
// Validate the characters in the URI. %nn decoding will be checked at
// the point of decoding.
for (int i = uriBC.getStart(); i < uriBC.getEnd(); i++) {
if (!httpParser.isAbsolutePathRelaxed(uriB[i])) {
badRequest("http11processor.request.invalidUri");
break;
}
}
// Input filter setup
InputFilter[] inputFilters = inputBuffer.getFilters();
// Parse transfer-encoding header
if (http11) {
MessageBytes transferEncodingValueMB = headers.getValue("transfer-encoding");
if (transferEncodingValueMB != null) {
List<String> encodingNames = new ArrayList<>();
if (TokenList.parseTokenList(headers.values("transfer-encoding"), encodingNames)) {
for (String encodingName : encodingNames) {
// "identity" codings are ignored
addInputFilter(inputFilters, encodingName);
}
} else {
// Invalid transfer encoding
badRequest("http11processor.request.invalidTransferEncoding");
}
}
}
// Parse content-length header
long contentLength = -1;
try {
contentLength = request.getContentLengthLong();
} catch (NumberFormatException e) {
badRequest("http11processor.request.nonNumericContentLength");
} catch (IllegalArgumentException e) {
badRequest("http11processor.request.multipleContentLength");
}
if (contentLength >= 0) {
if (contentDelimitation) {
// contentDelimitation being true at this point indicates that
// chunked encoding is being used but chunked encoding should
// not be used with a content length. RFC 2616, section 4.4,
// bullet 3 states Content-Length must be ignored in this case -
// so remove it.
headers.removeHeader("content-length");
request.setContentLength(-1);
} else {
inputBuffer.addActiveFilter(inputFilters[Constants.IDENTITY_FILTER]);
contentDelimitation = true;
}
}
// Validate host name and extract port if present
parseHost(hostValueMB);
if (!contentDelimitation) {
// If there's no content length
// (broken HTTP/1.0 or HTTP/1.1), assume
// the client is not broken and didn't send a body
inputBuffer.addActiveFilter(inputFilters[Constants.VOID_FILTER]);
contentDelimitation = true;
}
if (!getErrorState().isIoAllowed()) {
getAdapter().log(request, response, 0);
}
}
5 CoyoteAdapter
1.从request中取出httpRequest或者根据request生成httpRequest；从response中取出httpResponse或者根据response生成httpResponse
2.设置requestURI的编码
3.进一步解析http报文，解析uri，解析pathParameter，解析host信息，解析或者生成sessionID，设置或者生成userPrincipal
4.根据uri找到对应Host，context（war包），wrapper（servlet）
5.httpReques和httpResponse，交给容器StandardService处理
6.完成httpReques和httpResponse
@Override
public void service(org.apache.coyote.Request req, org.apache.coyote.Response res)
throws Exception {
Request request = (Request) req.getNote(ADAPTER_NOTES);
Response response = (Response) res.getNote(ADAPTER_NOTES);
if (request == null) {
// Create objects
request = connector.createRequest();
request.setCoyoteRequest(req);
response = connector.createResponse();
response.setCoyoteResponse(res);
// Link objects
request.setResponse(response);
response.setRequest(request);
// Set as notes
req.setNote(ADAPTER_NOTES, request);
res.setNote(ADAPTER_NOTES, response);
// Set query string encoding
req.getParameters().setQueryStringCharset(connector.getURICharset());
}
if (connector.getXpoweredBy()) {
response.addHeader("X-Powered-By", POWERED_BY);
}
boolean async = false;
boolean postParseSuccess = false;
req.getRequestProcessor().setWorkerThreadName(THREAD_NAME.get());
try {
// Parse and set Catalina and configuration specific
// request parameters
postParseSuccess = postParseRequest(req, request, res, response);
if (postParseSuccess) {
//check valves if we support async
request.setAsyncSupported(
connector.getService().getContainer().getPipeline().isAsyncSupported());
// Calling the container
connector.getService().getContainer().getPipeline().getFirst().invoke(
request, response);
}
if (request.isAsync()) {
async = true;
ReadListener readListener = req.getReadListener();
if (readListener != null && request.isFinished()) {
// Possible the all data may have been read during service()
// method so this needs to be checked here
ClassLoader oldCL = null;
try {
oldCL = request.getContext().bind(false, null);
if (req.sendAllDataReadEvent()) {
req.getReadListener().onAllDataRead();
}
} finally {
request.getContext().unbind(false, oldCL);
}
}
Throwable throwable =
(Throwable) request.getAttribute(RequestDispatcher.ERROR_EXCEPTION);
// If an async request was started, is not going to end once
// this container thread finishes and an error occurred, trigger
// the async error process
if (!request.isAsyncCompleting() && throwable != null) {
request.getAsyncContextInternal().setErrorState(throwable, true);
}
} else {
request.finishRequest();
response.finishResponse();
}
} catch (IOException e) {
// Ignore
} finally {
AtomicBoolean error = new AtomicBoolean(false);
res.action(ActionCode.IS_ERROR, error);
if (request.isAsyncCompleting() && error.get()) {
// Connection will be forcibly closed which will prevent
// completion happening at the usual point. Need to trigger
// call to onComplete() here.
res.action(ActionCode.ASYNC_POST_PROCESS, null);
async = false;
}
// Access log
if (!async && postParseSuccess) {
// Log only if processing was invoked.
// If postParseRequest() failed, it has already logged it.
Context context = request.getContext();
Host host = request.getHost();
// If the context is null, it is likely that the endpoint was
// shutdown, this connection closed and the request recycled in
// a different thread. That thread will have updated the access
// log so it is OK not to update the access log here in that
// case.
// The other possibility is that an error occurred early in
// processing and the request could not be mapped to a Context.
// Log via the host or engine in that case.
long time = System.currentTimeMillis() - req.getStartTime();
if (context != null) {
context.logAccess(request, response, time, false);
} else if (response.isError()) {
if (host != null) {
host.logAccess(request, response, time, false);
} else {
connector.getService().getContainer().logAccess(
request, response, time, false);
}
}
}
req.getRequestProcessor().setWorkerThreadName(null);
// Recycle the wrapper request and response
if (!async) {
updateWrapperErrorCount(request, response);
request.recycle();
response.recycle();
}
}
}
/**
* Perform the necessary processing after the HTTP headers have been parsed
* to enable the request/response pair to be passed to the start of the
* container pipeline for processing.
*
* @param req The coyote request object
* @param request The catalina request object
* @param res The coyote response object
* @param response The catalina response object
*
* @return <code>true</code> if the request should be passed on to the start
* of the container pipeline, otherwise <code>false</code>
*
* @throws IOException If there is insufficient space in a buffer while
* processing headers
* @throws ServletException If the supported methods of the target servlet
* cannot be determined
*/
protected boolean postParseRequest(org.apache.coyote.Request req, Request request,
org.apache.coyote.Response res, Response response) throws IOException, ServletException {
// If the processor has set the scheme (AJP does this, HTTP does this if
// SSL is enabled) use this to set the secure flag as well. If the
// processor hasn't set it, use the settings from the connector
if (req.scheme().isNull()) {
// Use connector scheme and secure configuration, (defaults to
// "http" and false respectively)
req.scheme().setString(connector.getScheme());
request.setSecure(connector.getSecure());
} else {
// Use processor specified scheme to determine secure state
request.setSecure(req.scheme().equals("https"));
}
// At this point the Host header has been processed.
// Override if the proxyPort/proxyHost are set
String proxyName = connector.getProxyName();
int proxyPort = connector.getProxyPort();
if (proxyPort != 0) {
req.setServerPort(proxyPort);
} else if (req.getServerPort() == -1) {
// Not explicitly set. Use default ports based on the scheme
if (req.scheme().equals("https")) {
req.setServerPort(443);
} else {
req.setServerPort(80);
}
}
if (proxyName != null) {
req.serverName().setString(proxyName);
}
MessageBytes undecodedURI = req.requestURI();
// Check for ping OPTIONS * request
if (undecodedURI.equals("*")) {
if (req.method().equalsIgnoreCase("OPTIONS")) {
StringBuilder allow = new StringBuilder();
allow.append("GET, HEAD, POST, PUT, DELETE, OPTIONS");
// Trace if allowed
if (connector.getAllowTrace()) {
allow.append(", TRACE");
}
res.setHeader("Allow", allow.toString());
// Access log entry as processing won't reach AccessLogValve
connector.getService().getContainer().logAccess(request, response, 0, true);
return false;
} else {
response.sendError(400, "Invalid URI");
}
}
MessageBytes decodedURI = req.decodedURI();
if (undecodedURI.getType() == MessageBytes.T_BYTES) {
// Copy the raw URI to the decodedURI
decodedURI.duplicate(undecodedURI);
// Parse (and strip out) the path parameters
parsePathParameters(req, request);
// URI decoding
// %xx decoding of the URL
try {
req.getURLDecoder().convert(decodedURI.getByteChunk(), connector.getEncodedSolidusHandlingInternal());
} catch (IOException ioe) {
response.sendError(400, "Invalid URI: " + ioe.getMessage());
}
// Normalization
if (normalize(req.decodedURI())) {
// Character decoding
convertURI(decodedURI, request);
// Check that the URI is still normalized
// Note: checkNormalize is deprecated because the test is no
// longer required in Tomcat 10 onwards and has been
// removed
if (!checkNormalize(req.decodedURI())) {
response.sendError(400, "Invalid URI");
}
} else {
response.sendError(400, "Invalid URI");
}
} else {
/* The URI is chars or String, and has been sent using an in-memory
* protocol handler. The following assumptions are made:
* - req.requestURI() has been set to the 'original' non-decoded,
* non-normalized URI
* - req.decodedURI() has been set to the decoded, normalized form
* of req.requestURI()
*/
decodedURI.toChars();
// Remove all path parameters; any needed path parameter should be set
// using the request object rather than passing it in the URL
CharChunk uriCC = decodedURI.getCharChunk();
int semicolon = uriCC.indexOf(';');
if (semicolon > 0) {
decodedURI.setChars(uriCC.getBuffer(), uriCC.getStart(), semicolon);
}
}
// Request mapping.
MessageBytes serverName;
if (connector.getUseIPVHosts()) {
serverName = req.localName();
if (serverName.isNull()) {
// well, they did ask for it
res.action(ActionCode.REQ_LOCAL_NAME_ATTRIBUTE, null);
}
} else {
serverName = req.serverName();
}
// Version for the second mapping loop and
// Context that we expect to get for that version
String version = null;
Context versionContext = null;
boolean mapRequired = true;
if (response.isError()) {
// An error this early means the URI is invalid. Ensure invalid data
// is not passed to the mapper. Note we still want the mapper to
// find the correct host.
decodedURI.recycle();
}
while (mapRequired) {
// This will map the the latest version by default
connector.getService().getMapper().map(serverName, decodedURI,
version, request.getMappingData());
// If there is no context at this point, either this is a 404
// because no ROOT context has been deployed or the URI was invalid
// so no context could be mapped.
if (request.getContext() == null) {
// Allow processing to continue.
// If present, the rewrite Valve may rewrite this to a valid
// request.
// The StandardEngineValve will handle the case of a missing
// Host and the StandardHostValve the case of a missing Context.
// If present, the error reporting valve will provide a response
// body.
return true;
}
// Now we have the context, we can parse the session ID from the URL
// (if any). Need to do this before we redirect in case we need to
// include the session id in the redirect
String sessionID;
if (request.getServletContext().getEffectiveSessionTrackingModes()
.contains(SessionTrackingMode.URL)) {
// Get the session ID if there was one
sessionID = request.getPathParameter(
SessionConfig.getSessionUriParamName(
request.getContext()));
if (sessionID != null) {
request.setRequestedSessionId(sessionID);
request.setRequestedSessionURL(true);
}
}
// Look for session ID in cookies and SSL session
try {
parseSessionCookiesId(request);
} catch (IllegalArgumentException e) {
// Too many cookies
if (!response.isError()) {
response.setError();
response.sendError(400);
}
return true;
}
parseSessionSslId(request);
sessionID = request.getRequestedSessionId();
mapRequired = false;
if (version != null && request.getContext() == versionContext) {
// We got the version that we asked for. That is it.
} else {
version = null;
versionContext = null;
Context[] contexts = request.getMappingData().contexts;
// Single contextVersion means no need to remap
// No session ID means no possibility of remap
if (contexts != null && sessionID != null) {
// Find the context associated with the session
for (int i = contexts.length; i > 0; i--) {
Context ctxt = contexts[i - 1];
if (ctxt.getManager().findSession(sessionID) != null) {
// We found a context. Is it the one that has
// already been mapped?
if (!ctxt.equals(request.getMappingData().context)) {
// Set version so second time through mapping
// the correct context is found
version = ctxt.getWebappVersion();
versionContext = ctxt;
// Reset mapping
request.getMappingData().recycle();
mapRequired = true;
// Recycle cookies and session info in case the
// correct context is configured with different
// settings
request.recycleSessionInfo();
request.recycleCookieInfo(true);
}
break;
}
}
}
}
if (!mapRequired && request.getContext().getPaused()) {
// Found a matching context but it is paused. Mapping data will
// be wrong since some Wrappers may not be registered at this
// point.
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
// Should never happen
}
// Reset mapping
request.getMappingData().recycle();
mapRequired = true;
}
}
// Possible redirect
MessageBytes redirectPathMB = request.getMappingData().redirectPath;
if (!redirectPathMB.isNull()) {
String redirectPath = URLEncoder.DEFAULT.encode(
redirectPathMB.toString(), StandardCharsets.UTF_8);
String query = request.getQueryString();
if (request.isRequestedSessionIdFromURL()) {
// This is not optimal, but as this is not very common, it
// shouldn't matter
redirectPath = redirectPath + ";" +
SessionConfig.getSessionUriParamName(
request.getContext()) +
"=" + request.getRequestedSessionId();
}
if (query != null) {
// This is not optimal, but as this is not very common, it
// shouldn't matter
redirectPath = redirectPath + "?" + query;
}
response.sendRedirect(redirectPath);
request.getContext().logAccess(request, response, 0, true);
return false;
}
// Filter trace method
if (!connector.getAllowTrace()
&& req.method().equalsIgnoreCase("TRACE")) {
Wrapper wrapper = request.getWrapper();
String header = null;
if (wrapper != null) {
String[] methods = wrapper.getServletMethods();
if (methods != null) {
for (String method : methods) {
if ("TRACE".equals(method)) {
continue;
}
if (header == null) {
header = method;
} else {
header += ", " + method;
}
}
}
}
if (header != null) {
res.addHeader("Allow", header);
}
response.sendError(405, "TRACE method is not allowed");
// Safe to skip the remainder of this method.
return true;
}
doConnectorAuthenticationAuthorization(req, request);
return true;
}
6 StandardService StandardWrapperValve ApplicationFilterChain
1.执行完所有的Valve和filter后再执行servlet的service方法，并根据http报文中的方法具体执行get，post，put等等方法。
public final void invoke(Request request, Response response)
throws IOException, ServletException {
// Initialize local variables we may need
boolean unavailable = false;
Throwable throwable = null;
// This should be a Request attribute...
long t1=System.currentTimeMillis();
requestCount.incrementAndGet();
StandardWrapper wrapper = (StandardWrapper) getContainer();
Servlet servlet = null;
Context context = (Context) wrapper.getParent();
// Check for the application being marked unavailable
if (!context.getState().isAvailable()) {
response.sendError(HttpServletResponse.SC_SERVICE_UNAVAILABLE,
sm.getString("standardContext.isUnavailable"));
unavailable = true;
}
// Check for the servlet being marked unavailable
if (!unavailable && wrapper.isUnavailable()) {
container.getLogger().info(sm.getString("standardWrapper.isUnavailable",
wrapper.getName()));
long available = wrapper.getAvailable();
if ((available > 0L) && (available < Long.MAX_VALUE)) {
response.setDateHeader("Retry-After", available);
response.sendError(HttpServletResponse.SC_SERVICE_UNAVAILABLE,
sm.getString("standardWrapper.isUnavailable",
wrapper.getName()));
} else if (available == Long.MAX_VALUE) {
response.sendError(HttpServletResponse.SC_NOT_FOUND,
sm.getString("standardWrapper.notFound",
wrapper.getName()));
}
unavailable = true;
}
// Allocate a servlet instance to process this request
try {
if (!unavailable) {
servlet = wrapper.allocate();
}
} catch (UnavailableException e) {
container.getLogger().error(
sm.getString("standardWrapper.allocateException",
wrapper.getName()), e);
long available = wrapper.getAvailable();
if ((available > 0L) && (available < Long.MAX_VALUE)) {
response.setDateHeader("Retry-After", available);
response.sendError(HttpServletResponse.SC_SERVICE_UNAVAILABLE,
sm.getString("standardWrapper.isUnavailable",
wrapper.getName()));
} else if (available == Long.MAX_VALUE) {
response.sendError(HttpServletResponse.SC_NOT_FOUND,
sm.getString("standardWrapper.notFound",
wrapper.getName()));
}
} catch (ServletException e) {
container.getLogger().error(sm.getString("standardWrapper.allocateException",
wrapper.getName()), StandardWrapper.getRootCause(e));
throwable = e;
exception(request, response, e);
} catch (Throwable e) {
ExceptionUtils.handleThrowable(e);
container.getLogger().error(sm.getString("standardWrapper.allocateException",
wrapper.getName()), e);
throwable = e;
exception(request, response, e);
servlet = null;
}
MessageBytes requestPathMB = request.getRequestPathMB();
DispatcherType dispatcherType = DispatcherType.REQUEST;
if (request.getDispatcherType()==DispatcherType.ASYNC) dispatcherType = DispatcherType.ASYNC;
request.setAttribute(Globals.DISPATCHER_TYPE_ATTR,dispatcherType);
request.setAttribute(Globals.DISPATCHER_REQUEST_PATH_ATTR,
requestPathMB);
// Create the filter chain for this request
ApplicationFilterChain filterChain =
ApplicationFilterFactory.createFilterChain(request, wrapper, servlet);
// Call the filter chain for this request
// NOTE: This also calls the servlet's service() method
Container container = this.container;
try {
if ((servlet != null) && (filterChain != null)) {
// Swallow output if needed
if (context.getSwallowOutput()) {
try {
SystemLogHandler.startCapture();
if (request.isAsyncDispatching()) {
request.getAsyncContextInternal().doInternalDispatch();
} else {
filterChain.doFilter(request.getRequest(),
response.getResponse());
}
} finally {
String log = SystemLogHandler.stopCapture();
if (log != null && log.length() > 0) {
context.getLogger().info(log);
}
}
} else {
if (request.isAsyncDispatching()) {
request.getAsyncContextInternal().doInternalDispatch();
} else {
filterChain.doFilter
(request.getRequest(), response.getResponse());
}
}
}
} catch (ClientAbortException | CloseNowException e) {
if (container.getLogger().isDebugEnabled()) {
container.getLogger().debug(sm.getString(
"standardWrapper.serviceException", wrapper.getName(),
context.getName()), e);
}
throwable = e;
exception(request, response, e);
} catch (IOException e) {
container.getLogger().error(sm.getString(
"standardWrapper.serviceException", wrapper.getName(),
context.getName()), e);
throwable = e;
exception(request, response, e);
} catch (UnavailableException e) {
container.getLogger().error(sm.getString(
"standardWrapper.serviceException", wrapper.getName(),
context.getName()), e);
// throwable = e;
// exception(request, response, e);
wrapper.unavailable(e);
long available = wrapper.getAvailable();
if ((available > 0L) && (available < Long.MAX_VALUE)) {
response.setDateHeader("Retry-After", available);
response.sendError(HttpServletResponse.SC_SERVICE_UNAVAILABLE,
sm.getString("standardWrapper.isUnavailable",
wrapper.getName()));
} else if (available == Long.MAX_VALUE) {
response.sendError(HttpServletResponse.SC_NOT_FOUND,
sm.getString("standardWrapper.notFound",
wrapper.getName()));
}
// Do not save exception in 'throwable', because we
// do not want to do exception(request, response, e) processing
} catch (ServletException e) {
Throwable rootCause = StandardWrapper.getRootCause(e);
if (!(rootCause instanceof ClientAbortException)) {
container.getLogger().error(sm.getString(
"standardWrapper.serviceExceptionRoot",
wrapper.getName(), context.getName(), e.getMessage()),
rootCause);
}
throwable = e;
exception(request, response, e);
} catch (Throwable e) {
ExceptionUtils.handleThrowable(e);
container.getLogger().error(sm.getString(
"standardWrapper.serviceException", wrapper.getName(),
context.getName()), e);
throwable = e;
exception(request, response, e);
} finally {
// Release the filter chain (if any) for this request
if (filterChain != null) {
filterChain.release();
}
// Deallocate the allocated servlet instance
try {
if (servlet != null) {
wrapper.deallocate(servlet);
}
} catch (Throwable e) {
ExceptionUtils.handleThrowable(e);
container.getLogger().error(sm.getString("standardWrapper.deallocateException",
wrapper.getName()), e);
if (throwable == null) {
throwable = e;
exception(request, response, e);
}
}
// If this servlet has been marked permanently unavailable,
// unload it and release this instance
try {
if ((servlet != null) &&
(wrapper.getAvailable() == Long.MAX_VALUE)) {
wrapper.unload();
}
} catch (Throwable e) {
ExceptionUtils.handleThrowable(e);
container.getLogger().error(sm.getString("standardWrapper.unloadException",
wrapper.getName()), e);
if (throwable == null) {
exception(request, response, e);
}
}
long t2=System.currentTimeMillis();
long time=t2-t1;
processingTime += time;
if( time > maxTime) maxTime=time;
if( time < minTime) minTime=time;
}
}
/**
* Invoke the next filter in this chain, passing the specified request
* and response. If there are no more filters in this chain, invoke
* the <code>service()</code> method of the servlet itself.
*
* @param request The servlet request we are processing
* @param response The servlet response we are creating
*
* @exception IOException if an input/output error occurs
* @exception ServletException if a servlet exception occurs
*/
@Override
public void doFilter(ServletRequest request, ServletResponse response)
throws IOException, ServletException {
if( Globals.IS_SECURITY_ENABLED ) {
final ServletRequest req = request;
final ServletResponse res = response;
try {
java.security.AccessController.doPrivileged(
new java.security.PrivilegedExceptionAction<Void>() {
@Override
public Void run()
throws ServletException, IOException {
internalDoFilter(req,res);
return null;
}
}
);
} catch( PrivilegedActionException pe) {
Exception e = pe.getException();
if (e instanceof ServletException)
throw (ServletException) e;
else if (e instanceof IOException)
throw (IOException) e;
else if (e instanceof RuntimeException)
throw (RuntimeException) e;
else
throw new ServletException(e.getMessage(), e);
}
} else {
internalDoFilter(request,response);
}
}
private void internalDoFilter(ServletRequest request,
ServletResponse response)
throws IOException, ServletException {
// Call the next filter if there is one
if (pos < n) {
ApplicationFilterConfig filterConfig = filters[pos++];
try {
Filter filter = filterConfig.getFilter();
if (request.isAsyncSupported() && "false".equalsIgnoreCase(
filterConfig.getFilterDef().getAsyncSupported())) {
request.setAttribute(Globals.ASYNC_SUPPORTED_ATTR, Boolean.FALSE);
}
if( Globals.IS_SECURITY_ENABLED ) {
final ServletRequest req = request;
final ServletResponse res = response;
Principal principal =
((HttpServletRequest) req).getUserPrincipal();
Object[] args = new Object[]{req, res, this};
SecurityUtil.doAsPrivilege ("doFilter", filter, classType, args, principal);
} else {
filter.doFilter(request, response, this);
}
} catch (IOException | ServletException | RuntimeException e) {
throw e;
} catch (Throwable e) {
e = ExceptionUtils.unwrapInvocationTargetException(e);
ExceptionUtils.handleThrowable(e);
throw new ServletException(sm.getString("filterChain.filter"), e);
}
return;
}
// We fell off the end of the chain -- call the servlet instance
try {
if (ApplicationDispatcher.WRAP_SAME_OBJECT) {
lastServicedRequest.set(request);
lastServicedResponse.set(response);
}
if (request.isAsyncSupported() && !servletSupportsAsync) {
request.setAttribute(Globals.ASYNC_SUPPORTED_ATTR,
Boolean.FALSE);
}
// Use potentially wrapped request from this point
if ((request instanceof HttpServletRequest) &&
(response instanceof HttpServletResponse) &&
Globals.IS_SECURITY_ENABLED ) {
final ServletRequest req = request;
final ServletResponse res = response;
Principal principal =
((HttpServletRequest) req).getUserPrincipal();
Object[] args = new Object[]{req, res};
SecurityUtil.doAsPrivilege("service",
servlet,
classTypeUsedInService,
args,
principal);
} else {
servlet.service(request, response);
}
} catch (IOException | ServletException | RuntimeException e) {
throw e;
} catch (Throwable e) {
e = ExceptionUtils.unwrapInvocationTargetException(e);
ExceptionUtils.handleThrowable(e);
throw new ServletException(sm.getString("filterChain.servlet"), e);
} finally {
if (ApplicationDispatcher.WRAP_SAME_OBJECT) {
lastServicedRequest.set(null);
lastServicedResponse.set(null);
}
}
}
/**
* Receives standard HTTP requests from the public
* <code>service</code> method and dispatches
* them to the <code>do</code><i>Method</i> methods defined in
* this class. This method is an HTTP-specific version of the
* {@link javax.servlet.Servlet#service} method. There's no
* need to override this method.
*
* @param req the {@link HttpServletRequest} object that
* contains the request the client made of
* the servlet
*
* @param resp the {@link HttpServletResponse} object that
* contains the response the servlet returns
* to the client
*
* @exception IOException if an input or output error occurs
* while the servlet is handling the
* HTTP request
*
* @exception ServletException if the HTTP request
* cannot be handled
*
* @see javax.servlet.Servlet#service
*/
protected void service(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
String method = req.getMethod();
if (method.equals(METHOD_GET)) {
long lastModified = getLastModified(req);
if (lastModified == -1) {
// servlet doesn't support if-modified-since, no reason
// to go through further expensive logic
doGet(req, resp);
} else {
long ifModifiedSince;
try {
ifModifiedSince = req.getDateHeader(HEADER_IFMODSINCE);
} catch (IllegalArgumentException iae) {
// Invalid date header - proceed as if none was set
ifModifiedSince = -1;
}
if (ifModifiedSince < (lastModified / 1000 * 1000)) {
// If the servlet mod time is later, call doGet()
// Round down to the nearest second for a proper compare
// A ifModifiedSince of -1 will always be less
maybeSetLastModified(resp, lastModified);
doGet(req, resp);
} else {
resp.setStatus(HttpServletResponse.SC_NOT_MODIFIED);
}
}
} else if (method.equals(METHOD_HEAD)) {
long lastModified = getLastModified(req);
maybeSetLastModified(resp, lastModified);
doHead(req, resp);
} else if (method.equals(METHOD_POST)) {
doPost(req, resp);
} else if (method.equals(METHOD_PUT)) {
doPut(req, resp);
} else if (method.equals(METHOD_DELETE)) {
doDelete(req, resp);
} else if (method.equals(METHOD_OPTIONS)) {
doOptions(req,resp);
} else if (method.equals(METHOD_TRACE)) {
doTrace(req,resp);
} else {
//
// Note that this means NO servlet supports whatever
// method was requested, anywhere on this server.
//
String errMsg = lStrings.getString("http.method_not_implemented");
Object[] errArgs = new Object[1];
errArgs[0] = method;
errMsg = MessageFormat.format(errMsg, errArgs);
resp.sendError(HttpServletResponse.SC_NOT_IMPLEMENTED, errMsg);
}
}
标签：processor,http,request,socketWrapper,else,源码,null,response,tomcat9 来源： https://blog.csdn.net/weixin_45043548/article/details/113625088