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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.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
*
* HttpService relies on {@link HttpProcessor} to generate mandatory protocol
* headers for all outgoing messages and apply common, cross-cutting message
* transformations to all incoming and outgoing messages, whereas individual
* {@link HttpRequestHandler}s are expected to take care of application specific
* content generation and processing.
*
* HttpService relies on {@link HttpRequestHandler} to resolve matching request
* handler for a particular request URI of an incoming HTTP request.
*
* HttpService can use optional {@link HttpExpectationVerifier} to ensure that
* incoming requests meet server's expectations.
*
* @since 4.0
*/
public class HttpService {
/**
* TODO: make all variables final in the next major version
*/
private volatile HttpParams params = null;
private volatile HttpProcessor processor = null;
private volatile HttpRequestHandlerResolver handlerResolver = null;
private volatile ConnectionReuseStrategy connStrategy = null;
private volatile HttpResponseFactory responseFactory = null;
private volatile HttpExpectationVerifier expectationVerifier = null;
/**
* Create a new HTTP service.
*
* @param processor the processor to use on requests and responses
* @param connStrategy the connection reuse strategy
* @param responseFactory the response factory
* @param handlerResolver the handler resolver. May be null.
* @param expectationVerifier the expectation verifier. May be null.
* @param params the HTTP parameters
*
* @since 4.1
*/
public HttpService(
final HttpProcessor processor,
final ConnectionReuseStrategy connStrategy,
final HttpResponseFactory responseFactory,
final HttpRequestHandlerResolver handlerResolver,
final HttpExpectationVerifier expectationVerifier,
final HttpParams params) {
super();
if (processor == null) {
throw new IllegalArgumentException("HTTP processor may not be null");
}
if (connStrategy == null) {
throw new IllegalArgumentException("Connection reuse strategy may not be null");
}
if (responseFactory == null) {
throw new IllegalArgumentException("Response factory may not be null");
}
if (params == null) {
throw new IllegalArgumentException("HTTP parameters may not be null");
}
this.processor = processor;
this.connStrategy = connStrategy;
this.responseFactory = responseFactory;
this.handlerResolver = handlerResolver;
this.expectationVerifier = expectationVerifier;
this.params = params;
}
/**
* Create a new HTTP service.
*
* @param processor the processor to use on requests and responses
* @param connStrategy the connection reuse strategy
* @param responseFactory the response factory
* @param handlerResolver the handler resolver. May be null.
* @param params the HTTP parameters
*
* @since 4.1
*/
public HttpService(
final HttpProcessor processor,
final ConnectionReuseStrategy connStrategy,
final HttpResponseFactory responseFactory,
final HttpRequestHandlerResolver handlerResolver,
final HttpParams params) {
this(processor, connStrategy, responseFactory, handlerResolver, null, params);
}
/**
* Create a new HTTP service.
*
* @param proc the processor to use on requests and responses
* @param connStrategy the connection reuse strategy
* @param responseFactory the response factory
*
* @deprecated use {@link HttpService#HttpService(HttpProcessor,
* ConnectionReuseStrategy, HttpResponseFactory, HttpRequestHandlerResolver, HttpParams)}
*/
public HttpService(
final HttpProcessor proc,
final ConnectionReuseStrategy connStrategy,
final HttpResponseFactory responseFactory) {
super();
setHttpProcessor(proc);
setConnReuseStrategy(connStrategy);
setResponseFactory(responseFactory);
}
/**
* @deprecated set {@link HttpProcessor} using constructor
*/
public void setHttpProcessor(final HttpProcessor processor) {
if (processor == null) {
throw new IllegalArgumentException("HTTP processor may not be null");
}
this.processor = processor;
}
/**
* @deprecated set {@link ConnectionReuseStrategy} using constructor
*/
public void setConnReuseStrategy(final ConnectionReuseStrategy connStrategy) {
if (connStrategy == null) {
throw new IllegalArgumentException("Connection reuse strategy may not be null");
}
this.connStrategy = connStrategy;
}
/**
* @deprecated set {@link HttpResponseFactory} using constructor
*/
public void setResponseFactory(final HttpResponseFactory responseFactory) {
if (responseFactory == null) {
throw new IllegalArgumentException("Response factory may not be null");
}
this.responseFactory = responseFactory;
}
/**
* @deprecated set {@link HttpResponseFactory} using constructor
*/
public void setParams(final HttpParams params) {
this.params = params;
}
/**
* @deprecated set {@link HttpRequestHandlerResolver} using constructor
*/
public void setHandlerResolver(final HttpRequestHandlerResolver handlerResolver) {
this.handlerResolver = handlerResolver;
}
/**
* @deprecated set {@link HttpExpectationVerifier} using constructor
*/
public void setExpectationVerifier(final HttpExpectationVerifier expectationVerifier) {
this.expectationVerifier = expectationVerifier;
}
public HttpParams getParams() {
return this.params;
}
/**
* Handles receives one HTTP request over the given connection within the
* given execution context and sends a response back to the client.
*
* @param conn the active connection to the client
* @param context the actual execution context.
* @throws IOException in case of an I/O error.
* @throws HttpException in case of HTTP protocol violation or a processing
* problem.
*/
public void handleRequest(
final HttpServerConnection conn,
final HttpContext context) throws IOException, HttpException {
context.setAttribute(ExecutionContext.HTTP_CONNECTION, conn);
HttpResponse response = null;
try {
HttpRequest request = conn.receiveRequestHeader();
request.setParams(
new DefaultedHttpParams(request.getParams(), this.params));
ProtocolVersion ver =
request.getRequestLine().getProtocolVersion();
if (!ver.lessEquals(HttpVersion.HTTP_1_1)) {
// Downgrade protocol version if greater than HTTP/1.1
ver = HttpVersion.HTTP_1_1;
}
if (request instanceof HttpEntityEnclosingRequest) {
if (((HttpEntityEnclosingRequest) request).expectContinue()) {
response = this.responseFactory.newHttpResponse(ver,
HttpStatus.SC_CONTINUE, context);
response.setParams(
new DefaultedHttpParams(response.getParams(), this.params));
if (this.expectationVerifier != null) {
try {
this.expectationVerifier.verify(request, response, context);
} catch (HttpException ex) {
response = this.responseFactory.newHttpResponse(HttpVersion.HTTP_1_0,
HttpStatus.SC_INTERNAL_SERVER_ERROR, context);
response.setParams(
new DefaultedHttpParams(response.getParams(), this.params));
handleException(ex, response);
}
}
if (response.getStatusLine().getStatusCode() < 200) {
// Send 1xx response indicating the server expections
// have been met
conn.sendResponseHeader(response);
conn.flush();
response = null;
conn.receiveRequestEntity((HttpEntityEnclosingRequest) request);
}
} else {
conn.receiveRequestEntity((HttpEntityEnclosingRequest) request);
}
}
if (response == null) {
response = this.responseFactory.newHttpResponse(ver, HttpStatus.SC_OK, context);
response.setParams(
new DefaultedHttpParams(response.getParams(), this.params));
context.setAttribute(ExecutionContext.HTTP_REQUEST, request);
context.setAttribute(ExecutionContext.HTTP_RESPONSE, response);
this.processor.process(request, context);
doService(request, response, context);
}
// Make sure the request content is fully consumed
if (request instanceof HttpEntityEnclosingRequest) {
HttpEntity entity = ((HttpEntityEnclosingRequest)request).getEntity();
EntityUtils.consume(entity);
}
} catch (HttpException ex) {
response = this.responseFactory.newHttpResponse
(HttpVersion.HTTP_1_0, HttpStatus.SC_INTERNAL_SERVER_ERROR,
context);
response.setParams(
new DefaultedHttpParams(response.getParams(), this.params));
handleException(ex, response);
}
this.processor.process(response, context);
conn.sendResponseHeader(response);
conn.sendResponseEntity(response);
conn.flush();
if (!this.connStrategy.keepAlive(response, context)) {
conn.close();
}
}
/**
* Handles the given exception and generates an HTTP response to be sent
* back to the client to inform about the exceptional condition encountered
* in the course of the request processing.
*
* @param ex the exception.
* @param response the HTTP response.
*/
protected void handleException(final HttpException ex, final HttpResponse response) {
if (ex instanceof MethodNotSupportedException) {
response.setStatusCode(HttpStatus.SC_NOT_IMPLEMENTED);
} else if (ex instanceof UnsupportedHttpVersionException) {
response.setStatusCode(HttpStatus.SC_HTTP_VERSION_NOT_SUPPORTED);
} else if (ex instanceof ProtocolException) {
response.setStatusCode(HttpStatus.SC_BAD_REQUEST);
} else {
response.setStatusCode(HttpStatus.SC_INTERNAL_SERVER_ERROR);
}
byte[] msg = EncodingUtils.getAsciiBytes(ex.getMessage());
ByteArrayEntity entity = new ByteArrayEntity(msg);
entity.setContentType("text/plain; charset=US-ASCII");
response.setEntity(entity);
}
/**
* The default implementation of this method attempts to resolve an
* {@link HttpRequestHandler} for the request URI of the given request
* and, if found, executes its
* {@link HttpRequestHandler#handle(HttpRequest, HttpResponse, HttpContext)}
* method.
*
* Super-classes can override this method in order to provide a custom
* implementation of the request processing logic.
*
* @param request the HTTP request.
* @param response the HTTP response.
* @param context the execution context.
* @throws IOException in case of an I/O error.
* @throws HttpException in case of HTTP protocol violation or a processing
* problem.
*/
protected void doService(
final HttpRequest request,
final HttpResponse response,
final HttpContext context) throws HttpException, IOException {
HttpRequestHandler handler = null;
if (this.handlerResolver != null) {
String requestURI = request.getRequestLine().getUri();
handler = this.handlerResolver.lookup(requestURI);
}
if (handler != null) {
handler.handle(request, response, context);
} else {
response.setStatusCode(HttpStatus.SC_NOT_IMPLEMENTED);
}
}
}