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The AWS SDK for Java Mobile - Core module holds the classes that is used by the individual service clients to interact with Amazon Web Services. Users need to depend on aws-java-sdk artifact for accessing individual client classes.
/*
* Copyright 2010-2018 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 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.DateUtils;
import com.amazonaws.util.TimingInfo;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import java.io.IOException;
import java.io.InputStream;
import java.net.URI;
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 java.util.UUID;
/**
* The Amazon HTTP Client class.
*/
public class AmazonHttpClient {
private static final String HEADER_USER_AGENT = "User-Agent";
private static final String HEADER_SDK_TRANSACTION_ID = "aws-sdk-invocation-id";
private static final String HEADER_SDK_RETRY_INFO = "aws-sdk-retry";
private static final int HTTP_STATUS_OK = 200;
private static final int HTTP_STATUS_TEMP_REDIRECT = 307;
private static final int HTTP_STATUS_MULTIPLE_CHOICES = 300;
private static final int HTTP_STATUS_REQ_TOO_LONG = 413;
private static final int HTTP_STATUS_SERVICE_UNAVAILABLE = 503;
private static final int TIME_MILLISEC = 1000;
/**
* 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 REQUEST_LOG = 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 */
final HttpClient httpClient;
/** Client configuration options, such as proxy settings, max retries, etc. */
final ClientConfiguration config;
/**
* 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 final HttpRequestFactory requestFactory = new HttpRequestFactory();
/**
* 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, new UrlHttpClient(config));
}
/**
* 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.
*/
@Deprecated
public AmazonHttpClient(ClientConfiguration config,
RequestMetricCollector requestMetricCollector) {
this(config, new UrlHttpClient(config), requestMetricCollector);
}
/**
* 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 httpClient client specific HttpClient
*/
public AmazonHttpClient(ClientConfiguration config, HttpClient httpClient) {
this.config = config;
this.httpClient = httpClient;
this.requestMetricCollector = 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 httpClient client specific HttpClient
* @param requestMetricCollector client specific request metric collector,
* which takes precedence over the one at the AWS SDK level; or
* null if there is none.
*/
@Deprecated
public 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.
* @deprecated ResponseMetadata cache can hold up to 50 requests and
* responses in memory and will cause memory issue. This method
* now always returns null.
*/
@Deprecated
public ResponseMetadata getResponseMetadataForRequest(AmazonWebServiceRequest request) {
return null;
}
/**
* 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
* @param the response type.
* @return the result of the request.
*/
public Response execute(Request request,
HttpResponseHandler> responseHandler,
HttpResponseHandler errorResponseHandler,
ExecutionContext executionContext) {
if (executionContext == null) {
throw new AmazonClientException(
"Internal SDK Error: No execution context parameter specified.");
}
final List requestHandler2s = requestHandler2s(request, executionContext);
final AWSRequestMetrics awsRequestMetrics = executionContext.getAwsRequestMetrics();
Response response = null;
try {
response = executeHelper(request, responseHandler, errorResponseHandler,
executionContext);
final TimingInfo timingInfo = awsRequestMetrics.getTimingInfo().endTiming();
afterResponse(request, requestHandler2s, response, timingInfo);
return response;
} catch (final AmazonClientException e) {
afterError(request, response, requestHandler2s, e);
throw e;
}
}
void afterError(Request request, Response response,
List requestHandler2s, AmazonClientException e) {
for (final RequestHandler2 handler2 : requestHandler2s) {
handler2.afterError(request, response, e);
}
}
void afterResponse(Request request,
List requestHandler2s,
Response response,
TimingInfo timingInfo) {
for (final RequestHandler2 handler2 : requestHandler2s) {
handler2.afterResponse(request, response);
}
}
List requestHandler2s(Request request,
ExecutionContext executionContext) {
final List requestHandler2s = executionContext
.getRequestHandler2s();
if (requestHandler2s == null) {
return Collections.emptyList();
}
// Apply any additional service specific request handlers that need
// to be run
for (final 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)
*/
@SuppressWarnings("checkstyle:methodlength")
Response executeHelper(Request request,
HttpResponseHandler> responseHandler,
HttpResponseHandler errorResponseHandler,
ExecutionContext executionContext) {
/*
* 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;
final 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);
request.addHeader(HEADER_SDK_TRANSACTION_ID, UUID.randomUUID().toString());
int requestCount = 0;
long lastBackoffDelay = 0;
URI redirectedURI = 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.
final Map originalParameters = new LinkedHashMap(
request.getParameters());
final Map originalHeaders = new HashMap(request.getHeaders());
// mark input stream if supported
final InputStream originalContent = request.getContent();
if (originalContent != null && originalContent.markSupported()) {
originalContent.mark(-1);
}
final AWSCredentials credentials = executionContext.getCredentials();
Signer signer = null;
HttpResponse httpResponse = null;
HttpRequest httpRequest = null;
while (true) {
++requestCount;
awsRequestMetrics.setCounter(Field.RequestCount, requestCount);
if (requestCount > 1) { // retry
request.setParameters(originalParameters);
request.setHeaders(originalHeaders);
request.setContent(originalContent);
}
if (redirectedURI != null && request.getEndpoint() == null
&& request.getResourcePath() == null) {
request.setEndpoint(URI.create(
redirectedURI.getScheme() + "://" + redirectedURI.getAuthority()));
request.setResourcePath(redirectedURI.getPath());
}
try {
if (requestCount > 1) { // retry
awsRequestMetrics.startEvent(Field.RetryPauseTime);
try {
lastBackoffDelay = pauseBeforeNextRetry(request.getOriginalRequest(),
retriedException,
requestCount,
config.getRetryPolicy());
} finally {
awsRequestMetrics.endEvent(Field.RetryPauseTime);
}
final InputStream content = request.getContent();
if (content != null && content.markSupported()) {
content.reset();
}
}
request.addHeader(HEADER_SDK_RETRY_INFO,
(requestCount - 1) + "/" + lastBackoffDelay);
// 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 (REQUEST_LOG.isDebugEnabled()) {
REQUEST_LOG.debug("Sending Request: " + request.toString());
}
httpRequest = requestFactory.createHttpRequest(request, config,
executionContext);
retriedException = null;
awsRequestMetrics.startEvent(Field.HttpRequestTime);
try {
httpResponse = httpClient.execute(httpRequest);
} finally {
awsRequestMetrics.endEvent(Field.HttpRequestTime);
}
if (isRequestSuccessful(httpResponse)) {
awsRequestMetrics.addProperty(Field.StatusCode, httpResponse.getStatusCode());
/*
* If we get back any 2xx status code, then we know we
* should treat the service call as successful.
*/
leaveHttpConnectionOpen = responseHandler.needsConnectionLeftOpen();
final T response = handleResponse(request, responseHandler,
httpResponse,
executionContext);
return new Response(response, httpResponse);
} else if (isTemporaryRedirect(httpResponse)) {
/*
* 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.
*/
final String redirectedLocation = httpResponse.getHeaders().get("Location");
log.debug("Redirecting to: " + redirectedLocation);
// set redirect uri and retry
redirectedURI = URI.create(redirectedLocation);
request.setEndpoint(null);
request.setResourcePath(null);
awsRequestMetrics.addProperty(Field.StatusCode, httpResponse.getStatusCode());
awsRequestMetrics.addProperty(Field.RedirectLocation, redirectedLocation);
awsRequestMetrics.addProperty(Field.AWSRequestID, null);
} else {
leaveHttpConnectionOpen = errorResponseHandler.needsConnectionLeftOpen();
final AmazonServiceException ase = handleErrorResponse(request, errorResponseHandler,
httpResponse);
awsRequestMetrics.addProperty(Field.AWSRequestID, ase.getRequestId());
awsRequestMetrics.addProperty(Field.AWSErrorCode, ase.getErrorCode());
awsRequestMetrics.addProperty(Field.StatusCode, ase.getStatusCode());
if (!shouldRetry(request.getOriginalRequest(),
httpRequest.getContent(),
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)) {
final int timeOffset = parseClockSkewOffset(httpResponse, ase);
SDKGlobalConfiguration.setGlobalTimeOffset(timeOffset);
}
resetRequestAfterError(request, ase);
}
} catch (final IOException ioe) {
if (log.isDebugEnabled()) {
log.debug("Unable to execute HTTP request: " + ioe.getMessage(), ioe);
}
awsRequestMetrics.incrementCounter(Field.Exception);
awsRequestMetrics.addProperty(Field.Exception, ioe);
awsRequestMetrics.addProperty(Field.AWSRequestID, null);
final AmazonClientException ace = new AmazonClientException(
"Unable to execute HTTP request: " + ioe.getMessage(), ioe);
if (!shouldRetry(request.getOriginalRequest(),
httpRequest.getContent(),
ace,
requestCount,
config.getRetryPolicy())) {
throw ace;
}
// Cache the retryable exception
retriedException = ace;
resetRequestAfterError(request, ioe);
} catch (final RuntimeException e) {
throw handleUnexpectedFailure(e, awsRequestMetrics);
} catch (final 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 && httpResponse != null) {
try {
if (httpResponse.getRawContent() != null) {
httpResponse.getRawContent().close();
}
} catch (final IOException e) {
log.warn("Cannot close the response content.", e);
}
}
}
} /* end while (true) */
}
/**
* 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.
*/
void resetRequestAfterError(Request request, Exception cause) {
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 (final 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.
*/
void setUserAgent(Request request) {
String userAgent = ClientConfiguration.DEFAULT_USER_AGENT;
// append request specific user agent marker
final AmazonWebServiceRequest awsreq = request.getOriginalRequest();
if (awsreq != null) {
final RequestClientOptions opts = awsreq.getRequestClientOptions();
if (opts != null) {
final String userAgentMarker = opts.getClientMarker(Marker.USER_AGENT);
if (userAgentMarker != null) {
userAgent = createUserAgentString(userAgent, userAgentMarker);
}
}
}
// if custom user agent is set via ClientConfiguration, append it to the end
if (!ClientConfiguration.DEFAULT_USER_AGENT.equals(config.getUserAgent())) {
userAgent = createUserAgentString(userAgent, config.getUserAgent());
}
request.addHeader(HEADER_USER_AGENT, userAgent);
}
/**
* Appends the given user-agent string to the existing one and returns it.
*/
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() {
httpClient.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,
InputStream inputStream,
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 (inputStream != null && !inputStream.markSupported()) {
if (log.isDebugEnabled()) {
log.debug("Content 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(HttpResponse response) {
final int statusCode = response.getStatusCode();
final String location = response.getHeaders().get("Location");
return statusCode == HTTP_STATUS_TEMP_REDIRECT &&
location != null && !location.isEmpty();
}
private boolean isRequestSuccessful(HttpResponse response) {
final int statusCode = response.getStatusCode();
return statusCode >= HTTP_STATUS_OK && statusCode < HTTP_STATUS_MULTIPLE_CHOICES;
}
/**
* 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.
*/
T handleResponse(Request request,
HttpResponseHandler> responseHandler,
HttpResponse response,
ExecutionContext executionContext) throws IOException {
try {
final AWSRequestMetrics awsRequestMetrics = executionContext.getAwsRequestMetrics();
AmazonWebServiceResponse awsResponse;
awsRequestMetrics.startEvent(Field.ResponseProcessingTime);
try {
awsResponse = responseHandler.handle(response);
} finally {
awsRequestMetrics.endEvent(Field.ResponseProcessingTime);
}
if (awsResponse == null) {
throw new RuntimeException(
"Unable to unmarshall response metadata. Response Code: " +
response.getStatusCode() + ", Response Text: "
+ response.getStatusText());
}
if (REQUEST_LOG.isDebugEnabled()) {
REQUEST_LOG.debug("Received successful response: " + response.getStatusCode()
+ ", AWS Request ID: " + awsResponse.getRequestId());
}
awsRequestMetrics.addProperty(Field.AWSRequestID, awsResponse.getRequestId());
return awsResponse.getResult();
} catch (final CRC32MismatchException e) {
throw e;
} catch (final IOException e) {
throw e;
} catch (final Exception e) {
final String errorMessage = "Unable to unmarshall response (" + e.getMessage()
+ "). Response Code: " +
response.getStatusCode() + ", Response Text: " + response.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.
*/
AmazonServiceException handleErrorResponse(Request request,
HttpResponseHandler errorResponseHandler,
HttpResponse response) throws IOException {
final int status = response.getStatusCode();
AmazonServiceException exception = null;
try {
exception = errorResponseHandler.handle(response);
REQUEST_LOG.debug("Received error response: " + exception.toString());
} catch (final Exception e) {
// If the errorResponseHandler doesn't work, then check for error
// responses that don't have any content
if (status == HTTP_STATUS_REQ_TOO_LONG) {
exception = new AmazonServiceException("Request entity too large");
exception.setServiceName(request.getServiceName());
exception.setStatusCode(HTTP_STATUS_REQ_TOO_LONG);
exception.setErrorType(ErrorType.Client);
exception.setErrorCode("Request entity too large");
} else if (status == HTTP_STATUS_SERVICE_UNAVAILABLE
&& "Service Unavailable".equalsIgnoreCase(response.getStatusText())) {
exception = new AmazonServiceException("Service unavailable");
exception.setServiceName(request.getServiceName());
exception.setStatusCode(HTTP_STATUS_SERVICE_UNAVAILABLE);
exception.setErrorType(ErrorType.Service);
exception.setErrorCode("Service unavailable");
} else if (e instanceof IOException) {
throw (IOException) e;
} else {
final String errorMessage = "Unable to unmarshall error response (" + e.getMessage()
+ "). Response Code: " + status
+ ", Response Text: " + response.getStatusText()
+ ", Response Headers: " + response.getHeaders();
throw new AmazonClientException(errorMessage, e);
}
}
exception.setStatusCode(status);
exception.setServiceName(request.getServiceName());
exception.fillInStackTrace();
return exception;
}
/**
* 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 long 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
final 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);
return delay;
} catch (final 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) {
final int startPos = body.indexOf("(");
int endPos = 0;
if (body.contains(" + 15")) {
endPos = body.indexOf(" + 15");
} else {
endPos = body.indexOf(" - 15");
}
final String msg = body.substring(startPos + 1, endPos);
return msg;
}
int parseClockSkewOffset(HttpResponse response, AmazonServiceException exception) {
final Date deviceDate = new Date();
Date serverDate = null;
String serverDateStr = null;
final String responseDateHeader = response.getHeaders().get("Date");
try {
if (responseDateHeader == null || responseDateHeader.isEmpty()) {
// SQS doesn't return Date header
serverDateStr = getServerDateFromException(exception.getMessage());
serverDate = DateUtils.parseCompressedISO8601Date(serverDateStr);
} else {
serverDateStr = responseDateHeader;
serverDate = DateUtils.parseRFC822Date(serverDateStr);
}
} catch (final RuntimeException e) {
log.warn("Unable to parse clock skew offset from response: "
+ serverDateStr,
e);
return 0;
}
final long diff = deviceDate.getTime() - serverDate.getTime();
return (int) (diff / TIME_MILLISEC);
}
@Override
protected void finalize() throws Throwable {
this.shutdown();
super.finalize();
}
/**
* @return the http client specific request metric collector; or null if
* there is none.
*/
public RequestMetricCollector getRequestMetricCollector() {
return requestMetricCollector;
}
}