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Amazon Web Services SDK for Android
/*
* Copyright 2010-2014 Amazon.com, Inc. or its affiliates. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License").
* You may not use this file except in compliance with the License.
* A copy of the License is located at
*
* http://aws.amazon.com/apache2.0
*
* or in the "license" file accompanying this file. This file 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.amazonaws.http;
import static com.amazonaws.SDKGlobalConfiguration.DISABLE_CERT_CHECKING_SYSTEM_PROPERTY;
import static com.amazonaws.SDKGlobalConfiguration.PROFILING_SYSTEM_PROPERTY;
import java.io.IOException;
import java.io.InputStream;
import java.net.URI;
import java.security.NoSuchAlgorithmException;
import java.util.Arrays;
import java.util.Collections;
import java.util.Date;
import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import javax.net.ssl.SSLContext;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.http.Header;
import org.apache.http.HttpEntity;
import org.apache.http.HttpEntityEnclosingRequest;
import org.apache.http.HttpStatus;
import org.apache.http.annotation.ThreadSafe;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpEntityEnclosingRequestBase;
import org.apache.http.client.methods.HttpRequestBase;
import org.apache.http.conn.ClientConnectionManager;
import org.apache.http.conn.scheme.Scheme;
import org.apache.http.conn.scheme.SchemeRegistry;
import org.apache.http.conn.ssl.SSLSocketFactory;
import org.apache.http.pool.ConnPoolControl;
import org.apache.http.pool.PoolStats;
import org.apache.http.protocol.BasicHttpContext;
import org.apache.http.protocol.HttpContext;
import com.amazonaws.AmazonClientException;
import com.amazonaws.AmazonServiceException;
import com.amazonaws.AmazonServiceException.ErrorType;
import com.amazonaws.AmazonWebServiceRequest;
import com.amazonaws.AmazonWebServiceResponse;
import com.amazonaws.ClientConfiguration;
import com.amazonaws.Request;
import com.amazonaws.RequestClientOptions;
import com.amazonaws.RequestClientOptions.Marker;
import com.amazonaws.Response;
import com.amazonaws.ResponseMetadata;
import com.amazonaws.SDKGlobalConfiguration;
import com.amazonaws.auth.AWSCredentials;
import com.amazonaws.auth.Signer;
import com.amazonaws.handlers.CredentialsRequestHandler;
import com.amazonaws.handlers.RequestHandler2;
import com.amazonaws.internal.CRC32MismatchException;
import com.amazonaws.metrics.AwsSdkMetrics;
import com.amazonaws.metrics.RequestMetricCollector;
import com.amazonaws.retry.RetryPolicy;
import com.amazonaws.retry.RetryUtils;
import com.amazonaws.util.AWSRequestMetrics;
import com.amazonaws.util.AWSRequestMetrics.Field;
import com.amazonaws.util.CountingInputStream;
import com.amazonaws.util.DateUtils;
import com.amazonaws.util.ResponseMetadataCache;
import com.amazonaws.util.TimingInfo;
@ThreadSafe
public class AmazonHttpClient {
private static final String HEADER_USER_AGENT = "User-Agent";
/**
* Logger providing detailed information on requests/responses. Users can
* enable this logger to get access to AWS request IDs for responses,
* individual requests and parameters sent to AWS, etc.
*/
private static final Log requestLog = LogFactory.getLog("com.amazonaws.request");
/**
* Logger for more detailed debugging information, that might not be as
* useful for end users (ex: HTTP client configuration, etc).
*/
static final Log log = LogFactory.getLog(AmazonHttpClient.class);
/** Internal client for sending HTTP requests */
private final HttpClient httpClient;
/** Client configuration options, such as proxy settings, max retries, etc. */
private final ClientConfiguration config;
/** Cache of metadata for recently executed requests for diagnostic purposes */
private final ResponseMetadataCache responseMetadataCache = new ResponseMetadataCache(50);
/**
* A request metric collector used specifically for this http client; or
* null if there is none. This collector, if specified, always takes
* precedence over the one specified at the AWS SDK level.
*
* @see AwsSdkMetrics
*/
private final RequestMetricCollector requestMetricCollector;
private static final HttpRequestFactory httpRequestFactory = new HttpRequestFactory();
private static final HttpClientFactory httpClientFactory = new HttpClientFactory();
static {
// Customers have reported XML parsing issues with the following
// JVM versions, which don't occur with more recent versions, so
// if we detect any of these, give customers a heads up.
List problematicJvmVersions = Arrays.asList(
"1.6.0_06", "1.6.0_13", "1.6.0_17");
String jvmVersion = System.getProperty("java.version");
if (problematicJvmVersions.contains(jvmVersion)) {
log.warn("Detected a possible problem with the current JVM version (" + jvmVersion + "). " +
"If you experience XML parsing problems using the SDK, try upgrading to a more recent JVM update.");
}
}
/**
* Constructs a new AWS client using the specified client configuration
* options (ex: max retry attempts, proxy settings, etc).
*
* @param config
* Configuration options specifying how this client will
* communicate with AWS (ex: proxy settings, retry count, etc.).
*/
public AmazonHttpClient(ClientConfiguration config) {
this(config, null);
}
/**
* Constructs a new AWS client using the specified client configuration
* options (ex: max retry attempts, proxy settings, etc), and request metric
* collector.
*
* @param config
* Configuration options specifying how this client will
* communicate with AWS (ex: proxy settings, retry count, etc.).
* @param requestMetricCollector
* client specific request metric collector, which takes
* precedence over the one at the AWS SDK level; or null if there
* is none.
*/
public AmazonHttpClient(ClientConfiguration config, RequestMetricCollector requestMetricCollector) {
this(config, httpClientFactory.createHttpClient(config), requestMetricCollector);
}
/**
* Package-protected constructor for unit test purposes.
*/
AmazonHttpClient(
ClientConfiguration config,
HttpClient httpClient,
RequestMetricCollector requestMetricCollector) {
this.config = config;
this.httpClient = httpClient;
this.requestMetricCollector = requestMetricCollector;
}
/**
* Returns additional response metadata for an executed request. Response
* metadata isn't considered part of the standard results returned by an
* operation, so it's accessed instead through this diagnostic interface.
* Response metadata is typically used for troubleshooting issues with AWS
* support staff when services aren't acting as expected.
*
* @param request
* A previously executed AmazonWebServiceRequest object, whose
* response metadata is desired.
*
* @return The response metadata for the specified request, otherwise null
* if there is no response metadata available for the request.
*/
public ResponseMetadata getResponseMetadataForRequest(AmazonWebServiceRequest request) {
return responseMetadataCache.get(request);
}
/**
* Disables the default strict hostname verification in this client and
* instead uses a browser compatible hostname verification strategy (i.e.
* cert hostname wildcards are evaulated more liberally).
*/
public void disableStrictHostnameVerification() {
/*
* If SSL cert checking for endpoints is disabled, we don't need
* to do any changes to the SSL context.
*/
if (System.getProperty(DISABLE_CERT_CHECKING_SYSTEM_PROPERTY) != null) {
return;
}
try {
SchemeRegistry schemeRegistry = httpClient.getConnectionManager().getSchemeRegistry();
SSLSocketFactory sf = new SSLSocketFactory(
SSLContext.getDefault(),
SSLSocketFactory.BROWSER_COMPATIBLE_HOSTNAME_VERIFIER);
Scheme https = new Scheme("https", 443, sf);
schemeRegistry.register(https);
} catch (NoSuchAlgorithmException e) {
throw new AmazonClientException("Unable to access default SSL context to disable strict hostname verification");
}
}
/**
* Executes the request and returns the result.
*
* @param request
* The AmazonWebServices request to send to the remote server
* @param responseHandler
* A response handler to accept a successful response from the
* remote server
* @param errorResponseHandler
* A response handler to accept an unsuccessful response from the
* remote server
* @param executionContext
* Additional information about the context of this web service
* call
*/
public Response execute(Request request,
HttpResponseHandler> responseHandler,
HttpResponseHandler errorResponseHandler,
ExecutionContext executionContext) throws AmazonClientException, AmazonServiceException {
if (executionContext == null)
throw new AmazonClientException("Internal SDK Error: No execution context parameter specified.");
List requestHandler2s = requestHandler2s(request, executionContext);
final AWSRequestMetrics awsRequestMetrics = executionContext.getAwsRequestMetrics();
Response response = null;
try {
response = executeHelper(request, responseHandler, errorResponseHandler, executionContext);
TimingInfo timingInfo = awsRequestMetrics.getTimingInfo().endTiming();
afterResponse(request, requestHandler2s, response, timingInfo);
return response;
} catch (AmazonClientException e) {
afterError(request, response, requestHandler2s, e);
throw e;
}
}
private void afterError(Request request, Response response,
List requestHandler2s, AmazonClientException e) {
for (RequestHandler2 handler2 : requestHandler2s) {
handler2.afterError(request, response, e);
}
}
private void afterResponse(Request request,
List requestHandler2s,
Response response,
TimingInfo timingInfo) {
for (RequestHandler2 handler2 : requestHandler2s) {
handler2.afterResponse(request, response);
}
}
private List requestHandler2s(Request request,
ExecutionContext executionContext) {
List requestHandler2s = executionContext
.getRequestHandler2s();
if (requestHandler2s == null) {
return Collections.emptyList();
}
// Apply any additional service specific request handlers that need
// to be run
for (RequestHandler2 requestHandler2 : requestHandler2s) {
// If the request handler is a type of CredentialsRequestHandler,
// then set the credentials in the request handler.
if (requestHandler2 instanceof CredentialsRequestHandler)
((CredentialsRequestHandler) requestHandler2)
.setCredentials(executionContext.getCredentials());
requestHandler2.beforeRequest(request);
}
return requestHandler2s;
}
/**
* Internal method to execute the HTTP method given.
*
* @see AmazonHttpClient#execute(Request, HttpResponseHandler, HttpResponseHandler)
* @see AmazonHttpClient#execute(Request, HttpResponseHandler, HttpResponseHandler, ExecutionContext)
*/
private Response executeHelper(Request request,
HttpResponseHandler> responseHandler,
HttpResponseHandler errorResponseHandler,
ExecutionContext executionContext)
throws AmazonClientException, AmazonServiceException
{
/*
* Depending on which response handler we end up choosing to handle the
* HTTP response, it might require us to leave the underlying HTTP
* connection open, depending on whether or not it reads the complete
* HTTP response stream from the HTTP connection, or if delays reading
* any of the content until after a response is returned to the caller.
*/
boolean leaveHttpConnectionOpen = false;
AWSRequestMetrics awsRequestMetrics = executionContext.getAwsRequestMetrics();
/* add the service endpoint to the logs. You can infer service name from service endpoint */
awsRequestMetrics.addProperty(Field.ServiceName, request.getServiceName());
awsRequestMetrics.addProperty(Field.ServiceEndpoint, request.getEndpoint());
// Apply whatever request options we know how to handle, such as user-agent.
setUserAgent(request);
int requestCount = 0;
URI redirectedURI = null;
HttpEntity entity = null;
AmazonClientException retriedException = null;
// Make a copy of the original request params and headers so that we can
// permute it in this loop and start over with the original every time.
Map originalParameters = new LinkedHashMap();
originalParameters.putAll(request.getParameters());
Map originalHeaders = new HashMap();
originalHeaders.putAll(request.getHeaders());
final AWSCredentials credentials = executionContext.getCredentials();
Signer signer = null;
while (true) {
++requestCount;
awsRequestMetrics.setCounter(Field.RequestCount, requestCount);
if (requestCount > 1) { // retry
request.setParameters(originalParameters);
request.setHeaders(originalHeaders);
}
HttpRequestBase httpRequest = null;
org.apache.http.HttpResponse apacheResponse = null;
try {
// Sign the request if a signer was provided
if (signer == null)
signer = executionContext.getSignerByURI(request.getEndpoint());
if (signer != null && credentials != null) {
awsRequestMetrics.startEvent(Field.RequestSigningTime);
try {
signer.sign(request, credentials);
} finally {
awsRequestMetrics.endEvent(Field.RequestSigningTime);
}
}
if (requestLog.isDebugEnabled()) {
requestLog.debug("Sending Request: " + request.toString());
}
httpRequest = httpRequestFactory.createHttpRequest(request, config, executionContext);
if (httpRequest instanceof HttpEntityEnclosingRequest) {
entity = ((HttpEntityEnclosingRequest)httpRequest).getEntity();
}
if (redirectedURI != null) {
httpRequest.setURI(redirectedURI);
}
if (requestCount > 1) { // retry
awsRequestMetrics.startEvent(Field.RetryPauseTime);
try {
pauseBeforeNextRetry(request.getOriginalRequest(),
retriedException,
requestCount,
config.getRetryPolicy());
} finally {
awsRequestMetrics.endEvent(Field.RetryPauseTime);
}
}
if ( entity != null ) {
InputStream content = entity.getContent();
if ( requestCount > 1 ) { // retry
if ( content.markSupported() ) {
content.reset();
content.mark(-1);
}
} else {
if ( content.markSupported() ) {
content.mark(-1);
}
}
}
captureConnectionPoolMetrics(httpClient.getConnectionManager(), awsRequestMetrics);
HttpContext httpContext = new BasicHttpContext();
httpContext.setAttribute(
AWSRequestMetrics.class.getSimpleName(),
awsRequestMetrics);
retriedException = null;
awsRequestMetrics.startEvent(Field.HttpRequestTime);
try {
apacheResponse = httpClient.execute(httpRequest, httpContext);
} finally {
awsRequestMetrics.endEvent(Field.HttpRequestTime);
}
if (isRequestSuccessful(apacheResponse)) {
awsRequestMetrics.addProperty(Field.StatusCode, apacheResponse.getStatusLine().getStatusCode());
/*
* If we get back any 2xx status code, then we know we should
* treat the service call as successful.
*/
leaveHttpConnectionOpen = responseHandler
.needsConnectionLeftOpen();
HttpResponse httpResponse = createResponse(httpRequest,
request, apacheResponse);
T response = handleResponse(request, responseHandler,
httpRequest, httpResponse, apacheResponse,
executionContext);
return new Response(response, httpResponse);
} else if (isTemporaryRedirect(apacheResponse)) {
/*
* S3 sends 307 Temporary Redirects if you try to delete an
* EU bucket from the US endpoint. If we get a 307, we'll
* point the HTTP method to the redirected location, and let
* the next retry deliver the request to the right location.
*/
Header[] locationHeaders = apacheResponse.getHeaders("location");
String redirectedLocation = locationHeaders[0].getValue();
log.debug("Redirecting to: " + redirectedLocation);
redirectedURI = URI.create(redirectedLocation);
httpRequest.setURI(redirectedURI);
awsRequestMetrics.addProperty(Field.StatusCode, apacheResponse.getStatusLine().getStatusCode());
awsRequestMetrics.addProperty(Field.RedirectLocation, redirectedLocation);
awsRequestMetrics.addProperty(Field.AWSRequestID, null);
} else {
leaveHttpConnectionOpen = errorResponseHandler.needsConnectionLeftOpen();
AmazonServiceException ase = handleErrorResponse(request, errorResponseHandler, httpRequest, apacheResponse);
awsRequestMetrics.addProperty(Field.AWSRequestID, ase.getRequestId());
awsRequestMetrics.addProperty(Field.AWSErrorCode, ase.getErrorCode());
awsRequestMetrics.addProperty(Field.StatusCode, ase.getStatusCode());
if (!shouldRetry(request.getOriginalRequest(),
httpRequest,
ase,
requestCount,
config.getRetryPolicy())) {
throw ase;
}
// Cache the retryable exception
retriedException = ase;
/*
* Checking for clock skew error again because we don't want to set the
* global time offset for every service exception.
*/
if(RetryUtils.isClockSkewError(ase)) {
int timeOffset = parseClockSkewOffset(apacheResponse, ase);
SDKGlobalConfiguration.setGlobalTimeOffset(timeOffset);
}
resetRequestAfterError(request, ase);
}
} catch (IOException ioe) {
if (log.isInfoEnabled()) {
log.info("Unable to execute HTTP request: " + ioe.getMessage(), ioe);
}
awsRequestMetrics.incrementCounter(Field.Exception);
awsRequestMetrics.addProperty(Field.Exception, ioe);
awsRequestMetrics.addProperty(Field.AWSRequestID, null);
AmazonClientException ace = new AmazonClientException("Unable to execute HTTP request: " + ioe.getMessage(), ioe);
if (!shouldRetry(request.getOriginalRequest(),
httpRequest,
ace,
requestCount,
config.getRetryPolicy())) {
throw ace;
}
// Cache the retryable exception
retriedException = ace;
resetRequestAfterError(request, ioe);
} catch(RuntimeException e) {
throw handleUnexpectedFailure(e, awsRequestMetrics);
} catch(Error e) {
throw handleUnexpectedFailure(e, awsRequestMetrics);
} finally {
/*
* Some response handlers need to manually manage the HTTP
* connection and will take care of releasing the connection on
* their own, but if this response handler doesn't need the
* connection left open, we go ahead and release the it to free
* up resources.
*/
if (!leaveHttpConnectionOpen) {
try {
if (apacheResponse != null && apacheResponse.getEntity() != null
&& apacheResponse.getEntity().getContent() != null) {
apacheResponse.getEntity().getContent().close();
}
} catch (IOException e) {
log.warn("Cannot close the response content.", e);
}
}
}
} /* end while (true) */
}
/**
* Captures the connection pool metrics.
*/
private void captureConnectionPoolMetrics(ClientConnectionManager connectionManager,
AWSRequestMetrics awsRequestMetrics) {
if (awsRequestMetrics.isEnabled()
&& connectionManager instanceof ConnPoolControl) {
ConnPoolControl control = (ConnPoolControl) connectionManager;
PoolStats stats = control.getTotalStats();
awsRequestMetrics.setCounter(
AWSRequestMetrics.Field.HttpClientPoolAvailableCount,
stats.getAvailable());
awsRequestMetrics.setCounter(
AWSRequestMetrics.Field.HttpClientPoolLeasedCount,
stats.getLeased());
awsRequestMetrics.setCounter(
AWSRequestMetrics.Field.HttpClientPoolPendingCount,
stats.getPending());
}
}
/**
* Handles an unexpected failure, returning the Throwable instance as given.
*/
private T handleUnexpectedFailure(T t, AWSRequestMetrics awsRequestMetrics) {
awsRequestMetrics.incrementCounter(Field.Exception);
awsRequestMetrics.addProperty(Field.Exception, t);
return t;
}
/**
* Resets the specified request, so that it can be sent again, after
* receiving the specified error. If a problem is encountered with resetting
* the request, then an AmazonClientException is thrown with the original
* error as the cause (not an error about being unable to reset the stream).
*
* @param request
* The request being executed that failed and needs to be reset.
* @param cause
* The original error that caused the request to fail.
*
* @throws AmazonClientException
* If the request can't be reset.
*/
private void resetRequestAfterError(Request request, Exception cause) throws AmazonClientException {
if ( request.getContent() == null ) {
return; // no reset needed
}
if ( ! request.getContent().markSupported() ) {
throw new AmazonClientException("Encountered an exception and stream is not resettable", cause);
}
try {
request.getContent().reset();
} catch ( IOException e ) {
// This exception comes from being unable to reset the input stream,
// so throw the original, more meaningful exception
throw new AmazonClientException(
"Encountered an exception and couldn't reset the stream to retry", cause);
}
}
/**
* Sets a User-Agent for the specified request, taking into account
* any custom data.
*/
private void setUserAgent(Request request) {
String userAgent = config.getUserAgent();
if ( !userAgent.equals(ClientConfiguration.DEFAULT_USER_AGENT) ) {
userAgent += ", " + ClientConfiguration.DEFAULT_USER_AGENT;
}
if ( userAgent != null ) {
request.addHeader(HEADER_USER_AGENT, userAgent);
}
AmazonWebServiceRequest awsreq = request.getOriginalRequest();
if (awsreq != null) {
RequestClientOptions opts = awsreq.getRequestClientOptions();
if (opts != null) {
String userAgentMarker = opts.getClientMarker(Marker.USER_AGENT);
if (userAgentMarker != null) {
request.addHeader(HEADER_USER_AGENT,
createUserAgentString(userAgent, userAgentMarker));
}
}
}
}
/**
* Appends the given user-agent string to the existing one and returns it.
*/
private static String createUserAgentString(String existingUserAgentString, String userAgent) {
if (existingUserAgentString.contains(userAgent)) {
return existingUserAgentString;
} else {
return existingUserAgentString.trim() + " " + userAgent.trim();
}
}
/**
* Shuts down this HTTP client object, releasing any resources that might be
* held open. This is an optional method, and callers are not expected to
* call it, but can if they want to explicitly release any open resources.
* Once a client has been shutdown, it cannot be used to make more requests.
*/
public void shutdown() {
IdleConnectionReaper.removeConnectionManager(httpClient.getConnectionManager());
httpClient.getConnectionManager().shutdown();
}
/**
* Returns true if a failed request should be retried.
*
* @param originalRequest
* The original service request that is being executed.
* @param method
* The current HTTP method being executed.
* @param exception
* The client/service exception from the failed request.
* @param requestCount
* The number of times the current request has been attempted.
*
* @return True if the failed request should be retried.
*/
private boolean shouldRetry(AmazonWebServiceRequest originalRequest,
HttpRequestBase method,
AmazonClientException exception,
int requestCount,
RetryPolicy retryPolicy) {
final int retries = requestCount - 1;
int maxErrorRetry = config.getMaxErrorRetry();
// We should use the maxErrorRetry in
// the RetryPolicy if either the user has not explicitly set it in
// ClientConfiguration, or the RetryPolicy is configured to take
// higher precedence.
if ( maxErrorRetry < 0
|| !retryPolicy.isMaxErrorRetryInClientConfigHonored() ) {
maxErrorRetry = retryPolicy.getMaxErrorRetry();
}
// Immediately fails when it has exceeds the max retry count.
if (retries >= maxErrorRetry) return false;
// Never retry on requests containing non-repeatable entity
if (method instanceof HttpEntityEnclosingRequest) {
HttpEntity entity = ((HttpEntityEnclosingRequest)method).getEntity();
if (entity != null && !entity.isRepeatable()) {
if (log.isDebugEnabled()) {
log.debug("Entity not repeatable");
}
return false;
}
}
// Pass all the context information to the RetryCondition and let it
// decide whether it should be retried.
return retryPolicy.getRetryCondition().shouldRetry(originalRequest,
exception,
retries);
}
private static boolean isTemporaryRedirect(org.apache.http.HttpResponse response) {
int status = response.getStatusLine().getStatusCode();
return status == HttpStatus.SC_TEMPORARY_REDIRECT &&
response.getHeaders("Location") != null &&
response.getHeaders("Location").length > 0;
}
private boolean isRequestSuccessful(org.apache.http.HttpResponse response) {
int status = response.getStatusLine().getStatusCode();
return status / 100 == HttpStatus.SC_OK / 100;
}
/**
* Handles a successful response from a service call by unmarshalling the
* results using the specified response handler.
*
* @param
* The type of object expected in the response.
*
* @param request
* The original request that generated the response being
* handled.
* @param responseHandler
* The response unmarshaller used to interpret the contents of
* the response.
* @param method
* The HTTP method that was invoked, and contains the contents of
* the response.
* @param executionContext
* Extra state information about the request currently being
* executed.
* @return The contents of the response, unmarshalled using the specified
* response handler.
*
* @throws IOException
* If any problems were encountered reading the response
* contents from the HTTP method object.
*/
private T handleResponse(Request request,
HttpResponseHandler> responseHandler,
HttpRequestBase method, HttpResponse httpResponse,
org.apache.http.HttpResponse apacheHttpResponse,
ExecutionContext executionContext) throws IOException
{
if (responseHandler.needsConnectionLeftOpen() && method instanceof HttpEntityEnclosingRequest) {
HttpEntityEnclosingRequest httpEntityEnclosingRequest = (HttpEntityEnclosingRequest)method;
httpResponse.setContent(new HttpMethodReleaseInputStream(httpEntityEnclosingRequest));
}
try {
CountingInputStream countingInputStream = null;
if (System.getProperty(PROFILING_SYSTEM_PROPERTY) != null) {
countingInputStream = new CountingInputStream(httpResponse.getContent());
httpResponse.setContent(countingInputStream);
}
AWSRequestMetrics awsRequestMetrics = executionContext.getAwsRequestMetrics();
AmazonWebServiceResponse awsResponse;
awsRequestMetrics.startEvent(Field.ResponseProcessingTime);
try {
awsResponse = responseHandler.handle(httpResponse);
} finally {
awsRequestMetrics.endEvent(Field.ResponseProcessingTime);
}
if (countingInputStream != null) {
awsRequestMetrics.setCounter(Field.BytesProcessed, countingInputStream.getByteCount());
}
if (awsResponse == null)
throw new RuntimeException("Unable to unmarshall response metadata. Response Code: " +
httpResponse.getStatusCode() + ", Response Text: " + httpResponse.getStatusText());
responseMetadataCache.add(request.getOriginalRequest(), awsResponse.getResponseMetadata());
if (requestLog.isDebugEnabled()) {
requestLog.debug("Received successful response: " + apacheHttpResponse.getStatusLine().getStatusCode()
+ ", AWS Request ID: " + awsResponse.getRequestId());
}
awsRequestMetrics.addProperty(Field.AWSRequestID, awsResponse.getRequestId());
return awsResponse.getResult();
} catch (CRC32MismatchException e) {
throw e;
} catch (IOException e) {
throw e;
} catch (Exception e) {
String errorMessage = "Unable to unmarshall response (" + e.getMessage() + "). Response Code: " +
httpResponse.getStatusCode() + ", Response Text: " + httpResponse.getStatusText();
throw new AmazonClientException(errorMessage, e);
}
}
/**
* Responsible for handling an error response, including unmarshalling the
* error response into the most specific exception type possible, and
* throwing the exception.
*
* @param request
* The request that generated the error response being handled.
* @param errorResponseHandler
* The response handler responsible for unmarshalling the error
* response.
* @param method
* The HTTP method containing the actual response content.
*
* @throws IOException
* If any problems are encountering reading the error response.
*/
private AmazonServiceException handleErrorResponse(Request request,
HttpResponseHandler errorResponseHandler,
HttpRequestBase method, org.apache.http.HttpResponse apacheHttpResponse) throws IOException {
int status = apacheHttpResponse.getStatusLine().getStatusCode();
HttpResponse response = createResponse(method, request, apacheHttpResponse);
if (errorResponseHandler.needsConnectionLeftOpen() && method instanceof HttpEntityEnclosingRequestBase) {
HttpEntityEnclosingRequestBase entityEnclosingRequest = (HttpEntityEnclosingRequestBase)method;
response.setContent(new HttpMethodReleaseInputStream(entityEnclosingRequest));
}
AmazonServiceException exception = null;
try {
exception = errorResponseHandler.handle(response);
requestLog.debug("Received error response: " + exception.toString());
} catch (Exception e) {
// If the errorResponseHandler doesn't work, then check for error
// responses that don't have any content
if (status == 413) {
exception = new AmazonServiceException("Request entity too large");
exception.setServiceName(request.getServiceName());
exception.setStatusCode(413);
exception.setErrorType(ErrorType.Client);
exception.setErrorCode("Request entity too large");
} else if (status == 503 && "Service Unavailable".equalsIgnoreCase(apacheHttpResponse.getStatusLine().getReasonPhrase())) {
exception = new AmazonServiceException("Service unavailable");
exception.setServiceName(request.getServiceName());
exception.setStatusCode(503);
exception.setErrorType(ErrorType.Service);
exception.setErrorCode("Service unavailable");
} else if (e instanceof IOException) {
throw (IOException) e;
} else {
String errorMessage = "Unable to unmarshall error response (" + e.getMessage() + "). Response Code: " +
status + ", Response Text: " + apacheHttpResponse.getStatusLine().getReasonPhrase();
throw new AmazonClientException(errorMessage, e);
}
}
exception.setStatusCode(status);
exception.setServiceName(request.getServiceName());
exception.fillInStackTrace();
return exception;
}
/**
* Creates and initializes an HttpResponse object suitable to be passed to
* an HTTP response handler object.
*
* @param method
* The HTTP method that was invoked to get the response.
* @param request
* The HTTP request associated with the response.
*
* @return The new, initialized HttpResponse object ready to be passed to an
* HTTP response handler object.
*
* @throws IOException
* If there were any problems getting any response information
* from the HttpClient method object.
*/
private HttpResponse createResponse(HttpRequestBase method, Request request, org.apache.http.HttpResponse apacheHttpResponse) throws IOException {
HttpResponse httpResponse = new HttpResponse(request, method);
if (apacheHttpResponse.getEntity() != null) {
httpResponse.setContent(apacheHttpResponse.getEntity().getContent());
}
httpResponse.setStatusCode(apacheHttpResponse.getStatusLine().getStatusCode());
httpResponse.setStatusText(apacheHttpResponse.getStatusLine().getReasonPhrase());
for (Header header : apacheHttpResponse.getAllHeaders()) {
httpResponse.addHeader(header.getName(), header.getValue());
}
return httpResponse;
}
/**
* Sleep for a period of time on failed request to avoid flooding a service
* with retries.
*
* @param originalRequest
* The original service request that is being executed.
* @param previousException
* Exception information for the previous attempt, if any.
* @param requestCount
* current request count (including the next attempt after the delay)
* @param retryPolicy
* The retry policy configured in this http client.
*/
private void pauseBeforeNextRetry(AmazonWebServiceRequest originalRequest,
AmazonClientException previousException,
int requestCount,
RetryPolicy retryPolicy) {
final int retries = requestCount // including next attempt
- 1 // number of attempted requests
- 1; // number of attempted retries
long delay = retryPolicy.getBackoffStrategy().delayBeforeNextRetry(
originalRequest, previousException, retries);
if (log.isDebugEnabled()) {
log.debug("Retriable error detected, " +
"will retry in " + delay + "ms, attempt number: " + retries);
}
try {
Thread.sleep(delay);
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
throw new AmazonClientException(e.getMessage(), e);
}
}
/**
* Returns date string from the exception message body in form of yyyyMMdd'T'HHmmss'Z'
* We needed to extract date from the message body because SQS is the only service
* that does not provide date header in the response. Example, when device time is
* behind than the server time than we get a string that looks something like this:
* "Signature expired: 20130401T030113Z is now earlier than 20130401T034613Z (20130401T040113Z - 15 min.)"
*
*
* @param body
* The message from where the server time is being extracted
*
* @return Return datetime in string format (yyyyMMdd'T'HHmmss'Z')
*/
private String getServerDateFromException(String body) {
int startPos = body.indexOf("(");
int endPos = 0;
if(body.contains(" + 15")) {
endPos = body.indexOf(" + 15");
} else {
endPos = body.indexOf(" - 15");
}
String msg = body.substring(startPos+1, endPos);
return msg;
}
private int parseClockSkewOffset(org.apache.http.HttpResponse response, AmazonServiceException exception) {
Date deviceDate = new Date();
Date serverDate = null;
String serverDateStr = null;
Header[] responseDateHeader = response.getHeaders("Date");
try {
if(responseDateHeader.length == 0) {
// SQS doesn't return Date header
serverDateStr = getServerDateFromException(exception.getMessage());
serverDate = DateUtils.parseCompressedISO8601Date(serverDateStr);
} else {
serverDateStr = responseDateHeader[0].getValue();
serverDate = DateUtils.parseRFC822Date(serverDateStr);
}
} catch (RuntimeException e) {
log.warn("Unable to parse clock skew offset from response: "
+ serverDateStr,
e);
return 0;
}
long diff = deviceDate.getTime() - serverDate.getTime();
return (int)(diff / 1000);
}
@Override
protected void finalize() throws Throwable {
this.shutdown();
super.finalize();
}
/**
* Returns the http client specific request metric collector; or null if
* there is none.
*/
public RequestMetricCollector getRequestMetricCollector() {
return requestMetricCollector;
}
}