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The KSC SDK for Java - Core module holds the classes that is used
by the individual service clients to interact with KSC Web Services.
Users need to depend on KSC-java-sdk artifact for accessing individual client classes.
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/*
* Copyright 2010-2016 ksyun.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://ksyun.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.ksc.http;
import com.ksc.AbortedException;
import com.ksc.KscClientException;
import com.ksc.KscServiceException;
import com.ksc.KscWebServiceRequest;
import com.ksc.KscWebServiceResponse;
import com.ksc.ClientConfiguration;
import com.ksc.Request;
import com.ksc.RequestClientOptions;
import com.ksc.ResetException;
import com.ksc.Response;
import com.ksc.ResponseMetadata;
import com.ksc.SDKGlobalTime;
import com.ksc.KscServiceException.ErrorType;
import com.ksc.RequestClientOptions.Marker;
import com.ksc.annotation.SdkTestInternalApi;
import com.ksc.auth.AWSCredentialsProvider;
import com.ksc.auth.Signer;
import com.ksc.auth.credentials.AWSCredentials;
import com.ksc.event.ProgressEventType;
import com.ksc.event.ProgressInputStream;
import com.ksc.event.ProgressListener;
import com.ksc.handlers.CredentialsRequestHandler;
import com.ksc.handlers.RequestHandler2;
import com.ksc.http.apache.client.impl.ApacheHttpClientFactory;
import com.ksc.http.apache.client.impl.ConnectionManagerAwareHttpClient;
import com.ksc.http.apache.request.impl.ApacheHttpRequestFactory;
import com.ksc.http.apache.utils.ApacheUtils;
import com.ksc.http.client.HttpClientFactory;
import com.ksc.http.exception.HttpRequestTimeoutException;
import com.ksc.http.request.HttpRequestFactory;
import com.ksc.http.settings.HttpClientSettings;
import com.ksc.http.timers.client.ClientExecutionTimeoutException;
import com.ksc.http.timers.client.ClientExecutionTimer;
import com.ksc.http.timers.client.SdkInterruptedException;
import com.ksc.http.timers.request.HttpRequestAbortTaskTracker;
import com.ksc.http.timers.request.HttpRequestTimer;
import com.ksc.internal.CRC32MismatchException;
import com.ksc.internal.ReleasableInputStream;
import com.ksc.internal.ResettableInputStream;
import com.ksc.internal.SdkBufferedInputStream;
import com.ksc.metrics.KscSdkMetrics;
import com.ksc.metrics.RequestMetricCollector;
import com.ksc.retry.RetryPolicy;
import com.ksc.retry.RetryUtils;
import com.ksc.retry.internal.AuthErrorRetryStrategy;
import com.ksc.retry.internal.AuthRetryParameters;
import com.ksc.util.KscRequestMetrics;
import com.ksc.util.CapacityManager;
import com.ksc.util.CollectionUtils;
import com.ksc.util.CountingInputStream;
import com.ksc.util.DateUtils;
import com.ksc.util.FakeIOException;
import com.ksc.util.ImmutableMapParameter;
import com.ksc.util.ResponseMetadataCache;
import com.ksc.util.TimingInfo;
import com.ksc.util.UnreliableFilterInputStream;
import com.ksc.util.KscRequestMetrics.Field;
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.StatusLine;
import org.apache.http.annotation.ThreadSafe;
import org.apache.http.client.methods.HttpRequestBase;
import org.apache.http.client.protocol.HttpClientContext;
import org.apache.http.entity.BufferedHttpEntity;
import org.apache.http.pool.ConnPoolControl;
import java.io.BufferedInputStream;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URI;
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 java.util.Map.Entry;
import java.util.UUID;
import static com.ksc.SDKGlobalConfiguration.PROFILING_SYSTEM_PROPERTY;
import static com.ksc.event.SDKProgressPublisher.publishProgress;
import static com.ksc.event.SDKProgressPublisher.publishRequestContentLength;
import static com.ksc.event.SDKProgressPublisher.publishResponseContentLength;
import static com.ksc.util.KscRequestMetrics.Field.HttpClientPoolAvailableCount;
import static com.ksc.util.KscRequestMetrics.Field.HttpClientPoolLeasedCount;
import static com.ksc.util.KscRequestMetrics.Field.HttpClientPoolPendingCount;
import static com.ksc.util.IOUtils.closeQuietly;
// TODOFIX
@ThreadSafe
public class KSCHttpClient {
public static final String HEADER_USER_AGENT = "User-Agent";
public static final String HEADER_SDK_TRANSACTION_ID = "ksc-sdk-invocation-id";
public static final String HEADER_SDK_RETRY_INFO = "ksc-sdk-retry";
/**
* 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(KSCHttpClient.class);
/**
* Logger used for the purpose of logging the KSC request id extracted either from the httpClientSettings header response or from
* the response body.
*/
private static final Log requestIdLog = LogFactory.getLog("com.ksc.requestId");
/**
* Logger providing detailed information on requests/responses. Users can
* enable this logger to get access to KSC request IDs for responses,
* individual requests and parameters sent to KSC, etc.
*/
private static final Log requestLog = LogFactory.getLog("com.ksc.request");
private static final HttpClientFactory httpClientFactory = new
ApacheHttpClientFactory();
/**
* Used for testing via failure injection.
*/
private static UnreliableTestConfig unreliableTestConfig;
/**
* When throttled retries are enabled, each retry attempt will consume this much capacity.
* Successful retry attempts will release this capacity back to the pool while failed retries
* will not. Successful initial (non-retry) requests will always release 1 capacity unit to the pool.
*/
private static final int THROTTLED_RETRY_COST = 5;
/**
* When throttled retries are enabled, this is the total number of subsequent failed retries
* that may be attempted before retry capacity is fully drained.
*/
private static final int THROTTLED_RETRIES = 100;
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.
// https://bugs.openjdk.java.net/browse/JDK-8028111
List problematicJvmVersions = Arrays.asList("1.6.0_06", "1.6.0_13", "1.6.0_17", "1.6.0_65", "1.7.0_45");
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.");
}
}
private final HttpRequestFactory httpRequestFactory =
new ApacheHttpRequestFactory();
/**
* Internal client for sending HTTP requests
*/
private ConnectionManagerAwareHttpClient httpClient;
/**
* Client configuration options, such as proxy httpClientSettings, max retries, etc.
*/
private final ClientConfiguration config;
/**
* Client configuration options, such as proxy httpClientSettings, max retries, etc.
*/
private final HttpClientSettings httpClientSettings;
/**
* Cache of metadata for recently executed requests for diagnostic purposes
*/
private final ResponseMetadataCache responseMetadataCache;
/**
* Timer to enforce HTTP request timeouts.
*/
private final HttpRequestTimer httpRequestTimer;
/** Retry capacity manager, used to manage throttled retry resource */
private final CapacityManager retryCapacity;
/**
* Timer to enforce timeouts on the whole execution of the request (request handlers, retries, backoff strategy,
* unmarshalling, etc)
*/
private final ClientExecutionTimer clientExecutionTimer;
/**
* A request metric collector used specifically for this httpClientSettings client; or null if there is none. This collector, if
* specified, always takes precedence over the one specified at the KSC SDK level.
*
* @see KscSdkMetrics
*/
private final RequestMetricCollector requestMetricCollector;
/**
* The time difference in seconds between this client and KSC.
*/
private volatile int timeOffset = SDKGlobalTime.getGlobalTimeOffset();
/**
* Constructs a new KSC client using the specified client configuration options (ex: max retry attempts, proxy
* httpClientSettings, etc).
*
* @param config Configuration options specifying how this client will communicate with KSC (ex: proxy httpClientSettings,
* retry count, etc.).
*/
public KSCHttpClient(ClientConfiguration config) {
this(config, null);
}
/**
* Constructs a new KSC client using the specified client configuration options (ex: max retry attempts, proxy
* httpClientSettings, etc), and request metric collector.
*
* @param config Configuration options specifying how this client will communicate with KSC (ex:
* proxy httpClientSettings, retry count, etc.).
* @param requestMetricCollector client specific request metric collector, which takes precedence over the one at
* the KSC SDK level; or null if there is none.
*/
public KSCHttpClient(ClientConfiguration config, RequestMetricCollector requestMetricCollector) {
this(config, requestMetricCollector, false);
}
/**
* Constructs a new KSC client using the specified client configuration options (ex: max retry attempts, proxy
* httpClientSettings, etc), and request metric collector.
*
* @param config Configuration options specifying how this client will communicate with KSC (ex:
* proxy httpClientSettings, retry count, etc.).
* @param requestMetricCollector client specific request metric collector, which takes precedence over the one at
* the KSC SDK level; or null if there is none.
*/
public KSCHttpClient(ClientConfiguration config,
RequestMetricCollector requestMetricCollector,
boolean useBrowserCompatibleHostNameVerifier) {
this(config, requestMetricCollector, HttpClientSettings.adapt(config,
useBrowserCompatibleHostNameVerifier));
this.httpClient = httpClientFactory.create(this.httpClientSettings);
}
/**
* Package-protected constructor for unit test purposes.
*/
@SdkTestInternalApi
public KSCHttpClient(ClientConfiguration clientConfig, ConnectionManagerAwareHttpClient httpClient,
RequestMetricCollector requestMetricCollector) {
this(clientConfig, requestMetricCollector, HttpClientSettings.adapt
(clientConfig, false));
this.httpClient = httpClient;
}
private KSCHttpClient(ClientConfiguration clientConfig,
RequestMetricCollector requestMetricCollector,
HttpClientSettings httpClientSettings) {
this.config = clientConfig;
this.httpClientSettings = httpClientSettings;
this.requestMetricCollector = requestMetricCollector;
this.responseMetadataCache = new ResponseMetadataCache(clientConfig
.getResponseMetadataCacheSize());
this.httpRequestTimer = new HttpRequestTimer();
this.clientExecutionTimer = new ClientExecutionTimer();
// When enabled, total retry capacity is computed based on retry cost
// and desired number of retries.
int throttledRetryMaxCapacity = clientConfig.useThrottledRetries()
? THROTTLED_RETRY_COST * THROTTLED_RETRIES : -1;
this.retryCapacity = new CapacityManager(throttledRetryMaxCapacity);
}
/**
* 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();
}
}
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;
}
/**
* Used to configure the test conditions for injecting intermittent failures to the content input stream.
*
* @param config unreliable test configuration for failure injection; or null to disable such test.
*/
static void configUnreliableTestConditions(UnreliableTestConfig config) {
unreliableTestConfig = config;
}
/**
* Package protected for unit-testing
*/
@SdkTestInternalApi
public HttpRequestTimer getHttpRequestTimer() {
return this.httpRequestTimer;
}
/**
* Package protected for unit-testing
*/
@SdkTestInternalApi
public ClientExecutionTimer getClientExecutionTimer() {
return this.clientExecutionTimer;
}
/**
* 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 KSC 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(KscWebServiceRequest request) {
return responseMetadataCache.get(request);
}
/**
* 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) {
if (executionContext == null) {
throw new KscClientException("Internal SDK Error: No execution context parameter specified.");
}
try {
return executeWithTimer(request, getNonNullResponseHandler(responseHandler),
getNonNullResponseHandler(errorResponseHandler), executionContext);
} catch (InterruptedException ie) {
throw handleInterruptedException(executionContext, ie);
} catch (AbortedException ae) {
throw handleAbortedException(executionContext, ae);
}
}
/**
* Ensures the response handler is not null. If it is this method returns a dummy response handler.
*
* @param responseHandler Response handler passed to {@link #execute(Request, HttpResponseHandler,
* HttpResponseHandler, ExecutionContext)}
* @return Either original response handler or dummy response handler.
*/
private HttpResponseHandler getNonNullResponseHandler(HttpResponseHandler responseHandler) {
if (responseHandler != null) {
return responseHandler;
} else {
// Return a Dummy, No-Op handler
return new HttpResponseHandler() {
@Override
public T handle(HttpResponse response) throws Exception {
return null;
}
@Override
public boolean needsConnectionLeftOpen() {
return false;
}
};
}
}
/**
* Start and end client execution timer around the execution of the request. It's important that the client
* execution task is canceled before the InterruptedExecption is handled by {@link #execute(Request,
* HttpResponseHandler, HttpResponseHandler, ExecutionContext)} so the interrupt status doesn't leak out to the
* callers code
*
* @throws InterruptedException
*/
public Response executeWithTimer(Request request,
HttpResponseHandler> responseHandler,
HttpResponseHandler errorResponseHandler,
ExecutionContext executionContext) throws InterruptedException {
try {
executionContext.setClientExecutionTrackerTask(
clientExecutionTimer.startTimer(getClientExecutionTimeout(request.getOriginalRequest())));
return doExecute(request, responseHandler, errorResponseHandler, executionContext);
} finally {
executionContext.getClientExecutionTrackerTask().cancelTask();
}
}
private Response doExecute(Request request,
HttpResponseHandler> responseHandler,
HttpResponseHandler errorResponseHandler,
ExecutionContext executionContext) throws InterruptedException {
final List requestHandler2s = requestHandler2s(request, executionContext);
KscWebServiceRequest kscreq = request.getOriginalRequest();
setSdkTransactionId(request);
setUserAgent(request);
ProgressListener listener = kscreq.getGeneralProgressListener();
// add custom headers
Map customHeaders = kscreq.getCustomRequestHeaders();
if (customHeaders != null) {
request.getHeaders().putAll(customHeaders);
}
// add custom query parameters
Map> customQueryParams = kscreq.getCustomQueryParameters();
if (customQueryParams != null) {
mergeQueryParameters(request, customQueryParams);
}
final KscRequestMetrics kscRequestMetrics = executionContext.getKscRequestMetrics();
Response response = null;
final InputStream origContent = request.getContent();
final InputStream toBeClosed = beforeRequest(request); // for progress tracking
// make "notCloseable", so reset would work with retries
final InputStream notCloseable = (toBeClosed == null) ? null
: ReleasableInputStream.wrap(toBeClosed).disableClose();
request.setContent(notCloseable);
try {
publishProgress(listener, ProgressEventType.CLIENT_REQUEST_STARTED_EVENT);
response = executeHelper(request, responseHandler, errorResponseHandler, executionContext,
requestHandler2s);
publishProgress(listener, ProgressEventType.CLIENT_REQUEST_SUCCESS_EVENT);
TimingInfo timingInfo = kscRequestMetrics.getTimingInfo().endTiming();
afterResponse(request, requestHandler2s, response, timingInfo);
return response;
} catch (KscClientException e) {
publishProgress(listener, ProgressEventType.CLIENT_REQUEST_FAILED_EVENT);
afterError(request, response, requestHandler2s, e);
throw e;
} finally {
// Always close so any progress tracking would get the final events propagated.
closeQuietly(toBeClosed, log);
request.setContent(origContent); // restore the original content
}
}
/**
* Determine if an interrupted exception is caused by the client execution timer interrupting the current thread or
* some other task interrupting the thread for another purpose.
*
* @param executionContext
* @param e
* @return {@link ClientExecutionTimeoutException} if the {@link InterruptedException} was caused by the {@link
* ClientExecutionTimer}. Otherwise re-interrupts the current thread and returns an {@link KscClientException}
* wrapping an {@link InterruptedException}
*/
private RuntimeException handleInterruptedException(ExecutionContext executionContext, InterruptedException e) {
if (e instanceof SdkInterruptedException) {
if (((SdkInterruptedException) e).getResponse() != null) {
((SdkInterruptedException) e).getResponse().getHttpResponse().getHttpRequest().abort();
}
}
if (executionContext.getClientExecutionTrackerTask().hasTimeoutExpired()) {
// Clear the interrupt status
Thread.interrupted();
return new ClientExecutionTimeoutException();
} else {
Thread.currentThread().interrupt();
return new KscClientException(e);
}
}
/**
* Determine if an aborted exception is caused by the client execution timer
* interrupting the current thread. If so throws {@link
* ClientExecutionTimeoutException} else throws the original {@link
* AbortedException}
*
* @param executionContext execution context for the current execution.
* @param ae aborted exception that occurred
* @return {@link ClientExecutionTimeoutException} if the {@link
* AbortedException} was caused by the {@link ClientExecutionTimer}.
* Otherwise throws the original {@link AbortedException}
*/
private RuntimeException handleAbortedException(final ExecutionContext
executionContext,
final AbortedException ae) {
if (executionContext.getClientExecutionTrackerTask()
.hasTimeoutExpired()) {
return new ClientExecutionTimeoutException();
} else {
return ae;
}
}
/**
* Check if the thread has been interrupted. If so throw an {@link InterruptedException}. Long running tasks should
* be periodically checked if the current thread has been interrupted and handle it appropriately
*
* @throws InterruptedException If thread has been interrupted
*/
private void checkInterrupted() throws InterruptedException {
checkInterrupted(null);
}
/**
* Check if the thread has been interrupted. If so throw an {@link InterruptedException}. Long running tasks should
* be periodically checked if the current thread has been interrupted and handle it appropriately
*
* @param response Response to be closed before returning control to the caller to avoid leaking the connection.
* @throws InterruptedException If thread has been interrupted
*/
private void checkInterrupted(Response response) throws InterruptedException {
if (Thread.interrupted()) {
throw new SdkInterruptedException(response);
}
}
/**
* Merge query parameters into the given request.
*/
private void mergeQueryParameters(Request request, Map> params) {
Map> existingParams = request.getParameters();
for (Entry> param : params.entrySet()) {
String pName = param.getKey();
List pValues = param.getValue();
existingParams.put(pName, CollectionUtils.mergeLists(existingParams.get(pName), pValues));
}
}
/**
* Publishes the "request content length" event, and returns an input stream, which will be made mark-and-resettable
* if possible, for progress tracking purposes.
*
* @return an input stream, which will be made mark-and-resettable if possible, for progress tracking purposes; or
* null if the request doesn't have an input stream
*/
private InputStream beforeRequest(Request request) {
final KscWebServiceRequest kscreq = request.getOriginalRequest();
ProgressListener listener = kscreq.getGeneralProgressListener();
Map headers = request.getHeaders();
String s = headers.get("Content-Length");
if (s != null) {
try {
long contentLength = Long.parseLong(s);
publishRequestContentLength(listener, contentLength);
} catch (NumberFormatException e) {
log.warn("Cannot parse the Content-Length header of the request.");
}
}
InputStream content = request.getContent();
if (content == null)
return null;
if (!content.markSupported()) {
// try to wrap the content input stream to become
// mark-and-resettable for signing and retry purposes.
if (content instanceof FileInputStream) {
try {
// ResettableInputStream supports mark-and-reset without
// memory buffering
content = new ResettableInputStream((FileInputStream) content);
} catch (IOException e) {
if (log.isDebugEnabled())
log.debug("For the record; ignore otherwise", e);
}
}
}
if (!content.markSupported())
content = new SdkBufferedInputStream(content);
final InputStream is = ProgressInputStream.inputStreamForRequest(content, kscreq);
if (KSCHttpClient.unreliableTestConfig == null)
return is;
return new UnreliableFilterInputStream(is, unreliableTestConfig.isFakeIOException())
.withBytesReadBeforeException(unreliableTestConfig.getBytesReadBeforeException())
.withMaxNumErrors(unreliableTestConfig.getMaxNumErrors())
.withResetIntervalBeforeException(unreliableTestConfig.getResetIntervalBeforeException());
}
private void afterError(Request request,
Response response,
List requestHandler2s,
KscClientException e) throws InterruptedException {
for (RequestHandler2 handler2 : requestHandler2s) {
handler2.afterError(request, response, e);
checkInterrupted(response);
}
}
private void afterResponse(Request request,
List requestHandler2s,
Response response,
TimingInfo timingInfo) throws InterruptedException {
for (RequestHandler2 handler2 : requestHandler2s) {
handler2.afterResponse(request, response);
checkInterrupted(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.getCredentialsProvider().getCredentials());
requestHandler2.beforeRequest(request);
}
return requestHandler2s;
}
/**
* Internal method to execute the HTTP method given.
*/
private Response executeHelper(final Request request,
HttpResponseHandler> responseHandler,
HttpResponseHandler errorResponseHandler,
final ExecutionContext executionContext,
List requestHandlers) throws InterruptedException {
/*
* add the service endpoint to the logs. You can infer service name from service endpoint
*/
final KscRequestMetrics kscRequestMetrics = executionContext.getKscRequestMetrics()
.addPropertyWith(Field.ServiceName, request.getServiceName())
.addPropertyWith(Field.ServiceEndpoint, request.getEndpoint());
// 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());
// Always mark the input stream before execution.
final ExecOneRequestParams execOneParams = new ExecOneRequestParams();
final InputStream originalContent = request.getContent();
if (originalContent != null && originalContent.markSupported()
&& !(originalContent instanceof BufferedInputStream)) {
// Mark only once for non-BufferedInputStream
KscWebServiceRequest kscreq = request.getOriginalRequest();
final int readLimit = kscreq.getRequestClientOptions().getReadLimit();
originalContent.mark(readLimit);
}
while (true) {
checkInterrupted();
if (originalContent instanceof BufferedInputStream && originalContent.markSupported()) {
// Mark everytime for BufferedInputStream, since the marker could
// have been invalidated
KscWebServiceRequest kscreq = request.getOriginalRequest();
final int readLimit = kscreq.getRequestClientOptions().getReadLimit();
originalContent.mark(readLimit);
}
execOneParams.initPerRetry();
if (execOneParams.redirectedURI != null) {
/*
* [scheme:][//authority][path][?query][#fragment]
*/
String scheme = execOneParams.redirectedURI.getScheme();
String beforeAuthority = scheme == null ? "" : scheme + "://";
String authority = execOneParams.redirectedURI.getAuthority();
String path = execOneParams.redirectedURI.getPath();
request.setEndpoint(URI.create(beforeAuthority + authority));
request.setResourcePath(path);
}
if (execOneParams.authRetryParam != null) {
request.setEndpoint(execOneParams.authRetryParam.getEndpointForRetry());
}
kscRequestMetrics.setCounter(Field.RequestCount, execOneParams.requestCount);
if (execOneParams.isRetry()) {
request.setParameters(originalParameters);
request.setHeaders(originalHeaders);
request.setContent(originalContent);
}
try {
Response response = executeOneRequest(request, responseHandler, errorResponseHandler,
executionContext, kscRequestMetrics, execOneParams, requestHandlers);
if (response != null) {
return response;
}
} catch (IOException ioe) {
if (log.isInfoEnabled()) {
log.info("Unable to execute HTTP request: " + ioe.getMessage(), ioe);
}
captureExceptionMetrics(ioe, kscRequestMetrics);
kscRequestMetrics.addProperty(Field.KSCRequestID, null);
KscClientException ace = new KscClientException(
"Unable to execute HTTP request: " + ioe.getMessage(), ioe);
if (!shouldRetry(request.getOriginalRequest(), execOneParams, ace,
executionContext)) {
throw lastReset(ace, request);
}
// Cache the retryable exception
execOneParams.retriedException = ace;
} catch (RuntimeException e) {
throw lastReset(captureExceptionMetrics(e, kscRequestMetrics), request);
} catch (Error e) {
throw lastReset(captureExceptionMetrics(e, kscRequestMetrics), request);
} 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 (!execOneParams.leaveHttpConnectionOpen) {
if (execOneParams.apacheResponse != null) {
HttpEntity entity = execOneParams.apacheResponse.getEntity();
if (entity != null) {
try {
closeQuietly(entity.getContent(), log);
} catch (IOException e) {
log.warn("Cannot close the response content.", e);
}
}
}
}
}
} /* end while (true) */
}
/**
* Used to perform a last reset on the content input stream (if mark-supported); this is so that, for backward
* compatibility reason, any "blind" retry (ie without calling reset) by user of this library with the same input
* stream (such as ByteArrayInputStream) could still succeed.
*
* @param t the failure
* @param req the request, if known; or null otherwise.
* @return the failure as given
*/
private T lastReset(final T t, final Request req) {
try {
InputStream content = req.getContent();
if (content != null) {
if (content.markSupported())
content.reset();
}
} catch (Exception ex) {
log.debug("FYI: failed to reset content inputstream before throwing up", ex);
}
return t;
}
/**
* Returns the credentials from the execution if exists. Else returns null.
*/
private AWSCredentials getCredentialsFromContext(final ExecutionContext executionContext,
final KscRequestMetrics requestMetrics) {
final AWSCredentialsProvider credentialsProvider = executionContext.getCredentialsProvider();
AWSCredentials credentials = null;
if (credentialsProvider != null) {
requestMetrics.startEvent(Field.CredentialsRequestTime);
try {
credentials = credentialsProvider.getCredentials();
} finally {
requestMetrics.endEvent(Field.CredentialsRequestTime);
}
}
return credentials;
}
/**
* Returns the response from executing one httpClientSettings request; or null for retry.
*/
private Response executeOneRequest(final Request request,
final HttpResponseHandler> responseHandler,
final HttpResponseHandler errorResponseHandler,
final ExecutionContext execContext,
final KscRequestMetrics kscRequestMetrics,
ExecOneRequestParams execOneParams,
List requestHandlers)
throws IOException, InterruptedException {
if (execOneParams.isRetry()) {
resetRequestInputStream(request);
}
checkInterrupted();
if (requestLog.isDebugEnabled()) {
requestLog.debug("Sending Request: " + request);
}
final AWSCredentials credentials = getCredentialsFromContext(execContext, kscRequestMetrics);
final KscWebServiceRequest kscreq = request.getOriginalRequest();
final ProgressListener listener = kscreq.getGeneralProgressListener();
if (execOneParams.isRetry()) {
pauseBeforeRetry(request, kscRequestMetrics, execOneParams, listener);
}
updateRetryHeaderInfo(request, execOneParams);
// Sign the request if a signer was provided
execOneParams.newSigner(request, execContext);
if (execOneParams.signer != null && credentials != null) {
kscRequestMetrics.startEvent(Field.RequestSigningTime);
try {
if (timeOffset != 0) {
// Always use the client level timeOffset if it was
// non-zero; Otherwise, we respect the timeOffset in the
// request, which could have been externally configured (at
// least for the 1st non-retry request).
//
// For retry due to clock skew, the timeOffset in the
// request used for the retry is assumed to have been
// adjusted when execution reaches here.
request.setTimeOffset(timeOffset);
}
execOneParams.signer.sign(request, credentials);
} finally {
kscRequestMetrics.endEvent(Field.RequestSigningTime);
}
}
checkInterrupted();
execOneParams.newApacheRequest(httpRequestFactory, request, httpClientSettings);
captureConnectionPoolMetrics(kscRequestMetrics);
final HttpClientContext localRequestContext =
ApacheUtils.newClientContext(httpClientSettings, ImmutableMapParameter.of
(KscRequestMetrics.class.getSimpleName(), kscRequestMetrics));
execOneParams.resetBeforeHttpRequest();
publishProgress(listener, ProgressEventType.HTTP_REQUEST_STARTED_EVENT);
kscRequestMetrics.startEvent(Field.HttpRequestTime);
kscRequestMetrics.setCounter(Field.RetryCapacityConsumed, retryCapacity.consumedCapacity());
/////////// Send HTTP request ////////////
execContext.getClientExecutionTrackerTask().setCurrentHttpRequest(execOneParams.apacheRequest);
final boolean isHeaderReqIdAvail;
final HttpRequestAbortTaskTracker requestAbortTaskTracker = httpRequestTimer
.startTimer(execOneParams.apacheRequest, getRequestTimeout(kscreq));
try {
execOneParams.apacheResponse = httpClient.execute(execOneParams.apacheRequest, localRequestContext);
if (shouldBufferHttpEntity(responseHandler.needsConnectionLeftOpen(), execContext, execOneParams,
requestAbortTaskTracker)) {
execOneParams.apacheResponse
.setEntity(new BufferedHttpEntity(execOneParams.apacheResponse.getEntity()));
}
isHeaderReqIdAvail = logHeaderRequestId(execOneParams.apacheResponse);
} catch (IOException ioe) {
// Client execution timeouts take precedence as it's not retryable
if (execContext.getClientExecutionTrackerTask().hasTimeoutExpired()) {
throw new InterruptedException();
} else if (requestAbortTaskTracker.httpRequestAborted()) {
throw new HttpRequestTimeoutException(ioe);
} else {
throw ioe;
}
} finally {
requestAbortTaskTracker.cancelTask();
kscRequestMetrics.endEvent(Field.HttpRequestTime);
}
publishProgress(listener, ProgressEventType.HTTP_REQUEST_COMPLETED_EVENT);
final StatusLine statusLine = execOneParams.apacheResponse.getStatusLine();
final int statusCode = statusLine == null ? -1 : statusLine.getStatusCode();
if (isRequestSuccessful(execOneParams.apacheResponse)) {
kscRequestMetrics.addProperty(Field.StatusCode, statusCode);
/*
* If we get back any 2xx status code, then we know we should treat the service call as
* successful.
*/
execOneParams.leaveHttpConnectionOpen = responseHandler.needsConnectionLeftOpen();
HttpResponse httpResponse = createResponse(execOneParams.apacheRequest, request,
execOneParams.apacheResponse);
T response = handleResponse(request, responseHandler, execOneParams.apacheRequest, httpResponse,
execOneParams.apacheResponse, execContext, isHeaderReqIdAvail, requestHandlers);
/*
* If this was a successful retry attempt we'll release the full retry capacity that
* the attempt originally consumed. If this was a successful initial request
* we return a lesser amount.
*/
if (execOneParams.isRetry() && execContext.retryCapacityConsumed()) {
retryCapacity.release(THROTTLED_RETRY_COST);
} else {
retryCapacity.release();
}
return new Response(response, httpResponse);
}
if (isTemporaryRedirect(execOneParams.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 = execOneParams.apacheResponse.getHeaders("location");
String redirectedLocation = locationHeaders[0].getValue();
if (log.isDebugEnabled())
log.debug("Redirecting to: " + redirectedLocation);
execOneParams.redirectedURI = URI.create(redirectedLocation);
kscRequestMetrics.addPropertyWith(Field.StatusCode, statusCode)
.addPropertyWith(Field.RedirectLocation, redirectedLocation)
.addPropertyWith(Field.KSCRequestID, null);
return null; // => retry
}
execOneParams.leaveHttpConnectionOpen = errorResponseHandler.needsConnectionLeftOpen();
final KscServiceException ase = handleErrorResponse(request, errorResponseHandler,
execOneParams.apacheRequest, execOneParams.apacheResponse);
kscRequestMetrics.addPropertyWith(Field.KSCRequestID, ase.getRequestId())
.addPropertyWith(Field.KSCErrorCode, ase.getErrorCode())
.addPropertyWith(Field.StatusCode, ase.getStatusCode());
// Check whether we should internally retry the auth error
execOneParams.authRetryParam = null;
AuthErrorRetryStrategy authRetry = execContext.getAuthErrorRetryStrategy();
if (authRetry != null) {
HttpResponse httpResponse = createResponse(execOneParams.apacheRequest, request,
execOneParams.apacheResponse);
execOneParams.authRetryParam = authRetry.shouldRetryWithAuthParam(request, httpResponse, ase);
}
if (execOneParams.authRetryParam == null && !shouldRetry(request.getOriginalRequest(),
execOneParams, ase, execContext)) {
throw ase;
}
// Comment out for now. Ref: CR2662349
// Preserve the cause of retry before retrying
// kscRequestMetrics.addProperty(RetryCause, ase);
if (RetryUtils.isThrottlingException(ase)) {
kscRequestMetrics.incrementCounterWith(Field.ThrottleException)
.addProperty(Field.ThrottleException, ase);
}
// Cache the retryable exception
execOneParams.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 clockSkew = parseClockSkewOffset(execOneParams.apacheResponse, ase);
SDKGlobalTime.setGlobalTimeOffset(timeOffset = clockSkew);
request.setTimeOffset(timeOffset); // adjust time offset for the retry
}
return null; // => retry
}
/**
* Reset the input stream of the request before a retry.
*
* @param request Request containing input stream to reset
* @throws ResetException If Input Stream can't be reset which means the request can't be retried
*/
private void resetRequestInputStream(final Request request) throws ResetException {
InputStream requestInputStream = request.getContent();
if (requestInputStream != null) {
if (requestInputStream.markSupported()) {
try {
requestInputStream.reset();
} catch (IOException ex) {
throw new ResetException("Failed to reset the request input stream", ex);
}
}
}
}
/**
* @return True if the {@link HttpEntity} should be wrapped in a {@link BufferedHttpEntity}
*/
private boolean shouldBufferHttpEntity(final boolean needsConnectionLeftOpen,
final ExecutionContext execContext,
ExecOneRequestParams execParams,
final HttpRequestAbortTaskTracker requestAbortTaskTracker) {
return (execContext.getClientExecutionTrackerTask().isEnabled() || requestAbortTaskTracker.isEnabled())
&& !needsConnectionLeftOpen && execParams.apacheResponse.getEntity() != null;
}
/**
* Used to log the "x-amzn-RequestId" header at DEBUG level, if any, from the response. This method assumes the
* apache httpClientSettings request/response has just been successfully executed. The request id is logged using the
* "com.ksc.requestId" logger if it was enabled at DEBUG level; otherwise, it is logged at DEBUG level using
* the "com.ksc.request" logger.
*
* @return true if the KSC request id is available from the httpClientSettings header; false otherwise.
*/
private boolean logHeaderRequestId(final org.apache.http.HttpResponse res) {
final Header reqIdHeader = res.getFirstHeader(HttpResponseHandler.X_KSC_REQUEST_ID_HEADER);
final boolean isHeaderReqIdAvail = reqIdHeader != null;
if (requestIdLog.isDebugEnabled() || requestLog.isDebugEnabled()) {
final String msg = HttpResponseHandler.X_KSC_REQUEST_ID_HEADER + ": "
+ (isHeaderReqIdAvail ? reqIdHeader.getValue() : "not available");
if (requestIdLog.isDebugEnabled())
requestIdLog.debug(msg);
else
requestLog.debug(msg);
}
return isHeaderReqIdAvail;
}
/**
* Used to log the request id (extracted from the response) at DEBUG level. This method is called only if there is
* no request id present in the httpClientSettings response header. The request id is logged using the "com.ksc.requestId"
* logger if it was enabled at DEBUG level; otherwise, it is logged using at DEBUG level using the
* "com.ksc.request" logger.
*/
private void logResponseRequestId(final String kscRequestId) {
if (requestIdLog.isDebugEnabled() || requestLog.isDebugEnabled()) {
final String msg = "KSC Request ID: " + (kscRequestId == null ? "not available" : kscRequestId);
if (requestIdLog.isDebugEnabled())
requestIdLog.debug(msg);
else
requestLog.debug(msg);
}
}
/**
* Captures the connection pool metrics.
*/
private void captureConnectionPoolMetrics(KscRequestMetrics kscRequestMetrics) {
if (kscRequestMetrics.isEnabled() && httpClient.getHttpClientConnectionManager() instanceof
ConnPoolControl) {
ConnPoolControl control = (ConnPoolControl) httpClient
.getHttpClientConnectionManager();
kscRequestMetrics
.withCounter(HttpClientPoolAvailableCount, control.getTotalStats().getAvailable())
.withCounter(HttpClientPoolLeasedCount, control.getTotalStats().getLeased())
.withCounter(HttpClientPoolPendingCount, control.getTotalStats().getPending());
}
}
/**
* Capture the metrics for the given throwable.
*/
private T captureExceptionMetrics(T t, KscRequestMetrics kscRequestMetrics) {
kscRequestMetrics.incrementCounterWith(Field.Exception)
.addProperty(Field.Exception, t);
if (t instanceof KscServiceException) {
KscServiceException ase = (KscServiceException) t;
if (RetryUtils.isThrottlingException(ase)) {
kscRequestMetrics.incrementCounterWith(Field.ThrottleException)
.addProperty(Field.ThrottleException, ase);
}
}
return t;
}
/**
* Create a client side identifier that will be sent with the initial request and each retry.
*/
private void setSdkTransactionId(Request request) {
request.addHeader(HEADER_SDK_TRANSACTION_ID, UUID.randomUUID().toString());
}
/**
* 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);
}
KscWebServiceRequest kscreq = request.getOriginalRequest();
RequestClientOptions opts = kscreq.getRequestClientOptions();
if (opts != null) {
String userAgentMarker = opts.getClientMarker(Marker.USER_AGENT);
if (userAgentMarker != null) {
request.addHeader(HEADER_USER_AGENT, createUserAgentString(userAgent, userAgentMarker));
}
}
}
/**
* Adds Retry information to the {@link #HEADER_SDK_RETRY_INFO} header. Used for analysis of retry policy.
*
* @param request Request to add header to
* @param execOneRequestParams Request context containing retry information
*/
private void updateRetryHeaderInfo(Request request, ExecOneRequestParams execOneRequestParams) {
int availableRetryCapacity = retryCapacity.availableCapacity();
String headerValue = String.format("%s/%s/%s",
execOneRequestParams.requestCount - 1,
execOneRequestParams.lastBackoffDelay,
availableRetryCapacity >= 0 ? availableRetryCapacity : "");
request.addHeader(HEADER_SDK_RETRY_INFO, headerValue);
}
/**
* 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() {
clientExecutionTimer.shutdown();
httpRequestTimer.shutdown();
IdleConnectionReaper.removeConnectionManager(httpClient
.getHttpClientConnectionManager());
httpClient.getHttpClientConnectionManager().shutdown();
}
/**
* Returns true if a failed request should be retried.
*
* @param originalRequest
* The original service request that is being executed.
* @param params
* Params for the individual request being executed.
* @param exception
* The client/service exception from the failed request.
* @param executionContext
* The execution context for the request being executed.
* @return True if the failed request should be retried.
*/
private boolean shouldRetry(KscWebServiceRequest originalRequest,
ExecOneRequestParams params,
KscClientException exception,
ExecutionContext executionContext) {
final int retries = params.requestCount - 1;
final RetryPolicy retryPolicy = config.getRetryPolicy();
final HttpRequestBase method = params.apacheRequest;
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;
}
}
// Do not use retry capacity for throttling exceptions
if (!(exception instanceof KscServiceException &&
RetryUtils.isThrottlingException((KscServiceException) exception)))
{
// See if we have enough available retry capacity to be able to execute
// this retry attempt.
if (!retryCapacity.acquire(THROTTLED_RETRY_COST)) {
return false;
}
executionContext.markRetryCapacityConsumed();
}
// Finally, pass all the context information to the RetryCondition and let it
// decide whether it should be retried.
if (!retryPolicy.getRetryCondition().shouldRetry(originalRequest, exception, retries)) {
// If the retry policy fails we immediately return consumed capacity to the pool.
if (executionContext.retryCapacityConsumed()) {
retryCapacity.release(THROTTLED_RETRY_COST);
}
return false;
}
return true;
}
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.
* @param isHeaderReqIdAvail true if the KSC request id is available from the httpClientSettings response header; false
* otherwise.
* @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.
*/
@SuppressWarnings("deprecation")
private T handleResponse(Request request,
HttpResponseHandler> responseHandler,
HttpRequestBase method,
HttpResponse httpResponse,
org.apache.http.HttpResponse apacheHttpResponse,
ExecutionContext executionContext,
final boolean isHeaderReqIdAvail,
List requestHandlers) throws IOException, InterruptedException {
KscWebServiceRequest kscreq = request.getOriginalRequest();
ProgressListener listener = kscreq.getGeneralProgressListener();
try {
/*
* Apply the byte counting stream wrapper if the legacy runtime profiling is enabled.
*/
CountingInputStream countingInputStream = null;
InputStream is = httpResponse.getContent();
if (is != null) {
if (System.getProperty(PROFILING_SYSTEM_PROPERTY) != null) {
is = countingInputStream = new CountingInputStream(is);
httpResponse.setContent(is);
}
httpResponse.setContent(ProgressInputStream.inputStreamForResponse(is, kscreq));
}
Map headers = httpResponse.getHeaders();
String s = headers.get("Content-Length");
if (s != null) {
try {
long contentLength = Long.parseLong(s);
publishResponseContentLength(listener, contentLength);
} catch (NumberFormatException e) {
log.warn("Cannot parse the Content-Length header of the response.");
}
}
KscRequestMetrics kscRequestMetrics = executionContext.getKscRequestMetrics();
KscWebServiceResponse kscResponse;
kscRequestMetrics.startEvent(Field.ResponseProcessingTime);
publishProgress(listener, ProgressEventType.HTTP_RESPONSE_STARTED_EVENT);
try {
kscResponse = responseHandler.handle(beforeUnmarshalling(requestHandlers, request, httpResponse));
} finally {
kscRequestMetrics.endEvent(Field.ResponseProcessingTime);
}
publishProgress(listener, ProgressEventType.HTTP_RESPONSE_COMPLETED_EVENT);
if (countingInputStream != null) {
kscRequestMetrics.setCounter(Field.BytesProcessed, countingInputStream.getByteCount());
}
if (kscResponse == null)
throw new RuntimeException("Unable to unmarshall response metadata. Response Code: "
+ httpResponse.getStatusCode() + ", Response Text: " + httpResponse.getStatusText());
KscWebServiceRequest userRequest = request.getOriginalRequest();
if (userRequest.getCloneRoot() != null)
userRequest = userRequest.getCloneRoot();
responseMetadataCache.add(userRequest, kscResponse.getResponseMetadata());
final String kscRequestId = kscResponse.getRequestId();
if (requestLog.isDebugEnabled()) {
final StatusLine statusLine = apacheHttpResponse.getStatusLine();
requestLog.debug(
"Received successful response: " + (statusLine == null ? null : statusLine.getStatusCode())
+ ", KSC Request ID: " + kscRequestId);
}
if (!isHeaderReqIdAvail) {
// Logs the KSC request ID extracted from the payload if
// it is not available from the response header.
logResponseRequestId(kscRequestId);
}
kscRequestMetrics.addProperty(Field.KSCRequestID, kscRequestId);
return kscResponse.getResult();
} catch (CRC32MismatchException e) {
throw e;
} catch (IOException e) {
throw e;
} catch (KscClientException e) {
throw e; // simply rethrow rather than further wrapping it
} catch (InterruptedException e) {
throw e;
} catch (Exception e) {
String errorMessage = "Unable to unmarshall response (" + e.getMessage() + "). Response Code: "
+ httpResponse.getStatusCode() + ", Response Text: " + httpResponse.getStatusText();
throw new KscClientException(errorMessage, e);
}
}
/**
* Run {@link RequestHandler2#beforeUnmarshalling(Request, HttpResponse)} callback
*
* @param requestHandler2s List of request handlers to invoke
* @param request Original request
* @param origHttpResponse Original {@link HttpResponse}
* @return {@link HttpResponse} object to pass to unmarshaller. May have been modified or replaced by the request
* handlers
*/
private HttpResponse beforeUnmarshalling(List requestHandler2s,
Request request,
HttpResponse origHttpResponse) {
HttpResponse toReturn = origHttpResponse;
for (RequestHandler2 requestHandler : requestHandler2s) {
toReturn = requestHandler.beforeUnmarshalling(request, toReturn);
}
return toReturn;
}
/**
* 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 KscServiceException handleErrorResponse(Request request,
HttpResponseHandler errorResponseHandler,
HttpRequestBase method,
final org.apache.http.HttpResponse apacheHttpResponse)
throws IOException, InterruptedException {
final StatusLine statusLine = apacheHttpResponse.getStatusLine();
final int statusCode;
final String reasonPhrase;
if (statusLine == null) {
statusCode = -1;
reasonPhrase = null;
} else {
statusCode = statusLine.getStatusCode();
reasonPhrase = statusLine.getReasonPhrase();
}
HttpResponse response = createResponse(method, request, apacheHttpResponse);
KscServiceException exception = null;
try {
exception = errorResponseHandler.handle(response);
if (requestLog.isDebugEnabled())
requestLog.debug("Received error response: " + exception);
} catch (InterruptedException e) {
throw e;
} catch (Exception e) {
// If the errorResponseHandler doesn't work, then check for error
// responses that don't have any content
if (statusCode == 413) {
exception = new KscServiceException("Request entity too large");
exception.setServiceName(request.getServiceName());
exception.setStatusCode(statusCode);
exception.setErrorType(ErrorType.Client);
exception.setErrorCode("Request entity too large");
} else if (statusCode >= 500 && statusCode < 600) {
exception = new KscServiceException(reasonPhrase);
exception.setServiceName(request.getServiceName());
exception.setStatusCode(statusCode);
exception.setErrorType(ErrorType.Service);
exception.setErrorCode(reasonPhrase);
} else if (e instanceof IOException) {
throw (IOException) e;
} else {
String errorMessage = "Unable to unmarshall error response (" + e.getMessage() + "). Response Code: "
+ (statusLine == null ? "None" : statusCode) + ", Response Text: " + reasonPhrase;
throw new KscClientException(errorMessage, e);
}
}
exception.setStatusCode(statusCode);
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;
}
/**
* Pause before the next retry and record metrics around retry behavior.
*/
private void pauseBeforeRetry(final Request request,
final KscRequestMetrics kscRequestMetrics,
ExecOneRequestParams execOneParams,
final ProgressListener listener) throws InterruptedException {
publishProgress(listener, ProgressEventType.CLIENT_REQUEST_RETRY_EVENT);
// Notify the progress listener of the retry
kscRequestMetrics.startEvent(Field.RetryPauseTime);
try {
// don't pause if the retry was not due to a redirection
// ie when retried exception is null
if (execOneParams.retriedException != null) {
doPauseBeforeRetry(request.getOriginalRequest(), execOneParams.retriedException,
execOneParams.requestCount, config.getRetryPolicy(), execOneParams);
}
} finally {
kscRequestMetrics.endEvent(Field.RetryPauseTime);
}
}
/**
* 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 httpClientSettings client.
*/
private void doPauseBeforeRetry(KscWebServiceRequest originalRequest,
KscClientException previousException,
int requestCount,
RetryPolicy retryPolicy,
ExecOneRequestParams execOneParams) throws InterruptedException {
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);
execOneParams.lastBackoffDelay = delay;
if (log.isDebugEnabled()) {
log.debug("Retriable error detected, " + "will retry in " + delay + "ms, attempt number: " + retries);
}
Thread.sleep(delay);
}
// SWF: Signature not yet current: 20140819T173921Z is still later than 20140819T173829Z
// (20140819T173329Z + 5 min.)
/**
* 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 = body.indexOf(" + ");
if (endPos == -1)
endPos = body.indexOf(" - ");
return endPos == -1 ? null : body.substring(startPos + 1, endPos);
}
/**
* Returns the difference between the client's clock time and the service clock time in unit of seconds.
*/
private int parseClockSkewOffset(org.apache.http.HttpResponse response, KscServiceException exception) {
final long currentTimeMilli = System.currentTimeMillis();
Date serverDate = null;
String serverDateStr = null;
Header[] responseDateHeader = response.getHeaders("Date");
try {
if (responseDateHeader.length == 0) {
// SQS doesn't return Date header
final String errmsg = exception.getMessage();
serverDateStr = getServerDateFromException(errmsg);
if (serverDateStr == null) {
log.warn("Unable to parse clock skew offset from errmsg: " + errmsg);
return 0;
}
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 = currentTimeMilli - serverDate.getTime();
return (int) (diff / 1000);
}
@Override
protected void finalize() throws Throwable {
this.shutdown();
super.finalize();
}
/**
* Returns the httpClientSettings client specific request metric collector; or null if there is none.
*/
public RequestMetricCollector getRequestMetricCollector() {
return requestMetricCollector;
}
/**
* Returns the time difference in seconds between this client and KSC.
*/
public int getTimeOffset() {
return timeOffset;
}
/**
* Gets the correct request timeout taking into account precedence of the configuration in {@link
* KscWebServiceRequest} versus {@link ClientConfiguration}
*
* @param request Current request
* @return Request timeout value or 0 if none is set
*/
private int getRequestTimeout(KscWebServiceRequest request) {
if (request.getSdkRequestTimeout() != null) {
return request.getSdkRequestTimeout();
} else {
return config.getRequestTimeout();
}
}
/**
* Gets the correct client execution timeout taking into account precedence of the configuration in {@link
* KscWebServiceRequest} versus {@link ClientConfiguration}
*
* @param request Current request
* @return Client Execution timeout value or 0 if none is set
*/
private int getClientExecutionTimeout(KscWebServiceRequest request) {
if (request.getSdkClientExecutionTimeout() != null) {
return request.getSdkClientExecutionTimeout();
} else {
return config.getClientExecutionTimeout();
}
}
/**
* Stateful parameters that are used for executing a single httpClientSettings request.
*/
private static class ExecOneRequestParams {
int requestCount; // monotonic increasing
/**
* Last delay between retries
*/
long lastBackoffDelay = 0;
KscClientException retriedException; // last retryable exception
HttpRequestBase apacheRequest;
org.apache.http.HttpResponse apacheResponse;
URI redirectedURI;
AuthRetryParameters authRetryParam;
/*
* 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;
private Signer signer; // cached
private URI signerURI;
boolean isRetry() {
return requestCount > 1 || redirectedURI != null || authRetryParam != null;
}
void initPerRetry() {
requestCount++;
apacheRequest = null;
apacheResponse = null;
leaveHttpConnectionOpen = false;
}
Signer newSigner(final Request request, final ExecutionContext execContext) {
if (authRetryParam != null) {
signerURI = authRetryParam.getEndpointForRetry();
signer = authRetryParam.getSignerForRetry();
// Push the local signer override back to the execution context
execContext.setSigner(signer);
} else if (redirectedURI != null && !redirectedURI.equals(signerURI)) {
signerURI = redirectedURI;
signer = execContext.getSignerByURI(signerURI);
} else if (signer == null) {
signerURI = request.getEndpoint();
signer = execContext.getSignerByURI(signerURI);
}
return signer;
}
/**
* @throws FakeIOException thrown only during test simulation
*/
HttpRequestBase newApacheRequest(
final HttpRequestFactory httpRequestFactory,
final Request request,
final HttpClientSettings options) throws IOException {
apacheRequest = httpRequestFactory.create(request, options);
if (redirectedURI != null)
apacheRequest.setURI(redirectedURI);
return apacheRequest;
}
void resetBeforeHttpRequest() {
retriedException = null;
authRetryParam = null;
redirectedURI = null;
}
}
}
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