/**
* Copyright © 2010-2011 Nokia
*
* Licensed 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 com.github.restdriver.clientdriver.jetty;
import java.io.IOException;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.List;
import java.util.Map.Entry;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.eclipse.jetty.server.Request;
import org.eclipse.jetty.server.handler.AbstractHandler;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.github.restdriver.RestDriverProperties;
import com.github.restdriver.clientdriver.ClientDriverExpectation;
import com.github.restdriver.clientdriver.ClientDriverRequest;
import com.github.restdriver.clientdriver.ClientDriverRequestResponsePair;
import com.github.restdriver.clientdriver.ClientDriverResponse;
import com.github.restdriver.clientdriver.HttpRealRequest;
import com.github.restdriver.clientdriver.RequestMatcher;
import com.github.restdriver.clientdriver.exception.ClientDriverFailedExpectationException;
import com.github.restdriver.clientdriver.exception.ClientDriverInternalException;
import com.google.common.collect.Lists;
/**
* Class which acts as a Jetty Handler to see if the actual incoming HTTP
* request matches any expectation and to act accordingly. In case of any kind
* of error, {@link ClientDriverInternalException} is usually thrown.
*/
public final class DefaultClientDriverJettyHandler extends AbstractHandler implements ClientDriverJettyHandler {
private static final Logger LOGGER = LoggerFactory.getLogger(DefaultClientDriverJettyHandler.class);
private static final long DEFAULT_WAIT_INTERVAL = 500;
private final List<ClientDriverExpectation> expectations;
private final List<ClientDriverRequestResponsePair> matchedResponses;
private final RequestMatcher matcher;
private final List<HttpRealRequest> unexpectedRequests;
private boolean failFastOnUnexpectedRequest = true;
/**
* Constructor which accepts a {@link RequestMatcher}.
*
* @param matcher
* The {@link RequestMatcher} to use.
*/
public DefaultClientDriverJettyHandler(RequestMatcher matcher) {
expectations = new ArrayList<ClientDriverExpectation>();
matchedResponses = new ArrayList<ClientDriverRequestResponsePair>();
unexpectedRequests = new ArrayList<HttpRealRequest>();
this.matcher = matcher;
}
/**
* {@inheritDoc}
* <p/>
* This implementation uses the expected {@link ClientDriverRequest}/ {@link ClientDriverResponse} pairs to serve its requests. If an unexpected request comes in, a
* {@link ClientDriverInternalException} is thrown.
*/
@Override
public void handle(String target, Request baseRequest, HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException {
LOGGER.info("Handling: {} {}", request.getMethod(), request.getPathInfo());
ClientDriverRequestResponsePair matchingPair = getMatchingRequestPair(request);
if (matchingPair != null) {
matchedResponses.add(matchingPair);
ClientDriverResponse matchedResponse = matchingPair.getResponse();
response.setContentType(matchedResponse.getContentType());
response.setStatus(matchedResponse.getStatus());
response.setHeader("Server", "rest-client-driver(" + RestDriverProperties.getVersion() + ")");
for (Entry<String, String> thisHeader : matchedResponse.getHeaders().entrySet()) {
response.setHeader(thisHeader.getKey(), thisHeader.getValue());
}
if (matchedResponse.hasBody()) {
OutputStream output = response.getOutputStream();
output.write(matchedResponse.getContentAsBytes());
}
delayIfNecessary(matchingPair.getResponse());
} else {
response.setStatus(404);
}
baseRequest.setHandled(true);
}
private void delayIfNecessary(ClientDriverResponse response) {
if (response.getDelayTime() > 0) {
try {
response.getDelayTimeUnit().sleep(response.getDelayTime());
} catch (InterruptedException ie) {
throw new ClientDriverInternalException("Requested delay was interrupted", ie);
}
}
}
private synchronized ClientDriverRequestResponsePair getMatchingRequestPair(HttpServletRequest request) {
ClientDriverExpectation matchedExpectation = null;
HttpRealRequest realRequest = new HttpRealRequest(request);
int index;
for (index = 0; index < expectations.size(); index++) {
ClientDriverExpectation thisExpectation = expectations.get(index);
ClientDriverRequestResponsePair thisPair = thisExpectation.getPair();
if (matcher.isMatch(realRequest, thisPair.getRequest())) {
thisExpectation.match(realRequest);
matchedExpectation = thisExpectation;
break;
}
}
if (matchedExpectation == null) {
this.unexpectedRequests.add(new HttpRealRequest(request));
if (failFastOnUnexpectedRequest) {
throw new ClientDriverFailedExpectationException(unexpectedRequests, expectations);
} else {
return null;
}
} else {
if (matchedExpectation.isSatisfied()) {
expectations.remove(index);
}
captureBodyIfRequired(realRequest, matchedExpectation);
return matchedExpectation.getPair();
}
}
private void captureBodyIfRequired(HttpRealRequest realRequest,
ClientDriverExpectation matchedExpectation) {
ClientDriverRequest request = matchedExpectation.getPair().getRequest();
if (request.getBodyCapture() != null) {
request.getBodyCapture().setBody(realRequest.getBodyContent());
}
}
@Override
public void checkForUnexpectedRequests() {
if (!unexpectedRequests.isEmpty()) {
throw new ClientDriverFailedExpectationException(unexpectedRequests, expectations);
}
}
@Override
public void checkForUnmatchedExpectations() {
if (expectations.isEmpty()) {
return;
}
long period = 0;
List<ClientDriverExpectation> failedExpectations = Lists.newArrayList();
while (true) {
if (period > 0) {
waitFor(period);
period = 0;
}
for (ClientDriverExpectation expectation : expectations) {
if (expectation.shouldMatchAnyTimes()) {
continue;
}
ClientDriverResponse response = expectation.getPair().getResponse();
if (response.canExpire() && response.hasNotExpired()) {
period = DEFAULT_WAIT_INTERVAL;
break;
}
failedExpectations.add(expectation);
}
if (period > 0) {
continue;
}
if (!failedExpectations.isEmpty()) {
throw new ClientDriverFailedExpectationException(failedExpectations);
}
break;
}
}
@Override
public void noFailFastOnUnexpectedRequest() {
failFastOnUnexpectedRequest = false;
}
@Override
public void reset() {
expectations.clear();
matchedResponses.clear();
unexpectedRequests.clear();
failFastOnUnexpectedRequest = true;
}
private void waitFor(long time) {
try {
Thread.sleep(time);
} catch (InterruptedException ie) {
throw new ClientDriverInternalException("Waiting for requests was interrupted", ie);
}
}
/**
* Add in a {@link ClientDriverRequest}/ {@link com.github.restdriver.clientdriver.ClientDriverResponse} pair.
*
* @param request
* The expected request
* @param response
* The response to serve to that request
* @return The added expectation
*/
@Override
public ClientDriverExpectation addExpectation(ClientDriverRequest request, ClientDriverResponse response) {
ClientDriverRequestResponsePair pair = new ClientDriverRequestResponsePair(request, response);
ClientDriverExpectation expectation = new ClientDriverExpectation(pair);
expectations.add(expectation);
return expectation;
}
}