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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;
import com.ksc.annotation.SdkProtectedApi;
import com.ksc.auth.RegionAwareSigner;
import com.ksc.auth.Signer;
import com.ksc.auth.SignerFactory;
import com.ksc.handlers.RequestHandler;
import com.ksc.handlers.RequestHandler2;
import com.ksc.http.KSCHttpClient;
import com.ksc.http.ExecutionContext;
import com.ksc.internal.DefaultServiceEndpointBuilder;
import com.ksc.log.CommonsLogFactory;
import com.ksc.metrics.KscSdkMetrics;
import com.ksc.metrics.RequestMetricCollector;
import com.ksc.regions.Region;
import com.ksc.regions.Regions;
import com.ksc.util.*;
import com.ksc.util.KscRequestMetrics.Field;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import java.net.URI;
import java.util.List;
import java.util.concurrent.CopyOnWriteArrayList;
import static com.ksc.SDKGlobalConfiguration.PROFILING_SYSTEM_PROPERTY;
/**
* Abstract base class for Ksc Web Service Java clients.
*
* Responsible for basic client capabilities that are the same across all KSC
* SDK Java clients (ex: setting the client endpoint).
*/
@SuppressWarnings("deprecation")
public abstract class KscWebServiceClient {
private static final String KSYUN = "Ksyun";
private static final String KSC = "KSC";
public static final boolean LOGGING_AWS_REQUEST_METRIC = true;
private static final Log log =
LogFactory.getLog(KscWebServiceClient.class);
static {
// Configures the internal logging of the signers and core
// classes to use Jakarta Commons Logging to stay consistent with the
// rest of the library.
boolean success = com.ksc.log.InternalLogFactory.configureFactory(
new CommonsLogFactory());
if (log.isDebugEnabled())
log.debug("Internal logging succesfully configured to commons logger: "
+ success);
}
/**
* The service endpoint to which this client will send requests.
*
* Subclass should only read but not assign to this field, at least not
* without synchronization on the enclosing object for thread-safety
* reason.
*/
protected volatile URI endpoint;
/**
* Used to explicitly override the internal signer region computed by the
* default implementation. This field is typically null.
*/
private volatile String signerRegionOverride;
/** The client configuration */
protected ClientConfiguration clientConfiguration;
/** Low level client for sending requests to AWS services. */
protected KSCHttpClient client;
/** Optional request handlers for additional request processing. */
protected final List requestHandler2s;
/** Optional offset (in seconds) to use when signing requests */
protected int timeOffset;
/** AWS signer for authenticating requests. */
private volatile Signer signer;
/**
* The cached service abbreviation for this service, used for identifying
* service endpoints by region, identifying the necessary signer, etc.
* Thread safe so it's backward compatible.
*/
private volatile String serviceName;
/**
* The service name in region metadata, i.e. the prefix of endpoint.
*/
private volatile String endpointPrefix;
/**
* Constructs a new KscWebServiceClient object using the specified
* configuration.
*
* @param clientConfiguration
* The client configuration for this client.
*/
public KscWebServiceClient(ClientConfiguration clientConfiguration) {
this(clientConfiguration, null);
}
/**
* Constructs a new KscWebServiceClient object using the specified
* configuration and request metric collector.
*
* @param clientConfiguration
* The client configuration for this client.
* @param requestMetricCollector
* optional request metric collector to be used at the http
* client level; can be null.
*/
public KscWebServiceClient(ClientConfiguration clientConfiguration,
RequestMetricCollector requestMetricCollector) {
this(clientConfiguration, requestMetricCollector, false);
}
@SdkProtectedApi
protected KscWebServiceClient(ClientConfiguration clientConfiguration,
RequestMetricCollector requestMetricCollector,
boolean disableStrictHostNameVerification) {
this.clientConfiguration = clientConfiguration;
requestHandler2s = new CopyOnWriteArrayList();
client = new KSCHttpClient(clientConfiguration,
requestMetricCollector, disableStrictHostNameVerification);
}
/**
* Returns the signer.
*
* Note, however, the signer configured for S3 is incomplete at this stage
* as the information on the S3 bucket and key is not yet known.
*/
protected Signer getSigner() { return signer; }
/**
* Overrides the default endpoint for this client. Callers can use this
* method to control which AWS region they want to work with.
*
* This method is not threadsafe. Endpoints should be configured when the
* client is created and before any service requests are made. Changing it
* afterwards creates inevitable race conditions for any service requests in
* transit.
*
* Callers can pass in just the endpoint (ex: "kec.ksyun.com") or a full
* URL, including the protocol (ex: "https://kec.ksyun.com"). If the
* protocol is not specified here, the default protocol from this client's
* {@link ClientConfiguration} will be used, which by default is HTTPS.
*
* For more information on using AWS regions with the AWS SDK for Java, and
* a complete list of all available endpoints for all AWS services, see:
*
* http://developer.amazonwebservices.com/connect/entry.jspa?externalID=3912
*
* @param endpoint
* The endpoint (ex: "kec.ksyun.com") or a full URL,
* including the protocol (ex: "https://kec.ksyun.com") of
* the region specific AWS endpoint this client will communicate
* with.
* @throws IllegalArgumentException
* If any problems are detected with the specified endpoint.
*/
public void setEndpoint(String endpoint) throws IllegalArgumentException {
URI uri = toURI(endpoint);
Signer signer = computeSignerByURI(uri, signerRegionOverride, false);
synchronized(this) {
this.endpoint = uri;
this.signer = signer;
}
}
/** Returns the endpoint as a URI. */
private URI toURI(String endpoint) throws IllegalArgumentException {
return RuntimeHttpUtils.toUri(endpoint, clientConfiguration);
}
/**
* Returns the signer based on the given URI and the current AWS client
* configuration. Currently only the SQS client can have different region on
* a per request basis. For other AWS clients, the region remains the same
* on a per AWS client level.
*
* Note, however, the signer returned for S3 is incomplete at this stage as
* the information on the S3 bucket and key is not yet known.
*/
public Signer getSignerByURI(URI uri) {
return computeSignerByURI(uri, signerRegionOverride, true);
}
/**
* Returns the signer for the given uri and the current client
* configuration.
*
* Note, however, the signer returned for S3 is incomplete at this stage as
* the information on the S3 bucket and key is not yet known.
*
* @param signerRegionOverride
* the overriding signer region; or null if there is none.
* @param isRegionIdAsSignerParam
* true if the "regionId" is used to configure the signer if
* applicable; false if this method is called for the purpose of
* purely setting the communication end point of this AWS client,
* and therefore the "regionId" parameter will not be used
* directly for configuring the signer.
*/
private Signer computeSignerByURI(URI uri, String signerRegionOverride,
boolean isRegionIdAsSignerParam) {
if (uri == null) {
throw new IllegalArgumentException(
"Endpoint is not set. Use setEndpoint to set an endpoint before performing any request.");
}
String service = getServiceNameIntern();
String region = KscHostNameUtils.parseRegionName(uri.getHost(), service);
return computeSignerByServiceRegion(
service, region, signerRegionOverride, isRegionIdAsSignerParam);
}
/**
* Returns the signer for the given service name, region id, and the current
* client configuration.
*
* Note, however, the signer returned for S3 is incomplete at this stage as
* the information on the S3 bucket and key is not yet known.
*
* @param regionId
* the region for sending AWS requests
* @param signerRegionOverride
* the overriding signer region; or null if there is none.
* @param isRegionIdAsSignerParam
* true if the "regionId" is used to configure the signer if
* applicable; false if this method is called for the purpose of
* purely setting the communication end point of this AWS client,
* and therefore the "regionId" parameter will not be used
* directly for configuring the signer.
*/
private Signer computeSignerByServiceRegion(
String serviceName, String regionId,
String signerRegionOverride,
boolean isRegionIdAsSignerParam) {
String signerType = clientConfiguration.getSignerOverride();
Signer signer = signerType == null
? SignerFactory.getSigner(serviceName, regionId)
: SignerFactory.getSignerByTypeAndService(signerType, serviceName)
;
if (signer instanceof RegionAwareSigner) {
// Overrides the default region computed
RegionAwareSigner regionAwareSigner = (RegionAwareSigner)signer;
// (signerRegionOverride != null) means that it is likely to be AWS
// internal dev work, as "signerRegionOverride" is typically null
// when used in the external release
if (signerRegionOverride != null)
regionAwareSigner.setRegionName(signerRegionOverride);
else if (regionId != null && isRegionIdAsSignerParam)
regionAwareSigner.setRegionName(regionId);
}
return signer;
}
/**
* An alternative to {@link KscWebServiceClient#setEndpoint(String)}, sets the regional
* endpoint for this client's service calls. Callers can use this method to control which AWS
* region they want to work with.
*
* This method is not threadsafe. A region should be configured when the client is created
* and before any service requests are made. Changing it afterwards creates inevitable race
* conditions for any service requests in transit or retrying.
*
* By default, all service endpoints in all regions use the https protocol. To use http instead,
* specify it in the {@link ClientConfiguration} supplied at construction.
*
* @param region
* The region this client will communicate with. See
* {@link Region#getRegion(com.ksc.regions.Regions)} for accessing a given
* region.
* @throws java.lang.IllegalArgumentException
* If the given region is null, or if this service isn't available in the given
* region. See {@link Region#isServiceSupported(String)}
* @see Region#getRegion(com.ksc.regions.Regions)
* @see Region#createClient(Class, com.ksc.auth.AWSCredentialsProvider,
* ClientConfiguration)
*/
public void setRegion(Region region) throws IllegalArgumentException {
if (region == null) {
throw new IllegalArgumentException("No region provided");
}
final String serviceNameForEndpoint = getEndpointPrefix();
final String serviceNameForSigner = getServiceNameIntern();
URI uri = new DefaultServiceEndpointBuilder(serviceNameForEndpoint, clientConfiguration.getProtocol()
.toString()).withRegion(region).getServiceEndpoint();
Signer signer = computeSignerByServiceRegion(serviceNameForSigner, region.getName(), signerRegionOverride, false);
synchronized (this) {
this.endpoint = uri;
this.signer = signer;
}
}
/**
* Convenient method for setting region.
*
* @param region region to set to; must not be null.
*
* @see #setRegion(Region)
*/
public final void configureRegion(Regions region) {
if (region == null)
throw new IllegalArgumentException("No region provided");
this.setRegion(Region.getRegion(region));
}
/**
* Shuts down this 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 should not be used to make any more
* requests.
*/
public void shutdown() {
client.shutdown();
}
/**
* @deprecated by {@link #addRequestHandler(RequestHandler2)}.
*
* Appends a request handler to the list of registered handlers that are run
* as part of a request's lifecycle.
*
* @param requestHandler
* The new handler to add to the current list of request
* handlers.
*/
@Deprecated
public void addRequestHandler(RequestHandler requestHandler) {
requestHandler2s.add(RequestHandler2.adapt(requestHandler));
}
/**
* Appends a request handler to the list of registered handlers that are run
* as part of a request's lifecycle.
*
* @param requestHandler2
* The new handler to add to the current list of request
* handlers.
*/
public void addRequestHandler(RequestHandler2 requestHandler2) {
requestHandler2s.add(requestHandler2);
}
/**
* Removes a request handler from the list of registered handlers that are run
* as part of a request's lifecycle.
*
* @param requestHandler
* The handler to remove from the current list of request
* handlers.
*/
public void removeRequestHandler(RequestHandler requestHandler) {
requestHandler2s.remove(RequestHandler2.adapt(requestHandler));
}
public void removeRequestHandler(RequestHandler2 requestHandler2) {
requestHandler2s.remove(requestHandler2);
}
/**
* Runs the {@code beforeMarshalling} method of any
* {@code RequestHandler2}s associated with this client.
*
* @param request the request passed in from the user
* @return the (possibly different) request to marshal
*/
@SuppressWarnings("unchecked")
protected final T beforeMarshalling(
T request) {
T local = request;
for (RequestHandler2 handler : requestHandler2s) {
local = (T) handler.beforeMarshalling(local);
}
return local;
}
protected ExecutionContext createExecutionContext(KscWebServiceRequest req) {
boolean isMetricsEnabled = isRequestMetricsEnabled(req) || isProfilingEnabled();
return new ExecutionContext(requestHandler2s, isMetricsEnabled, this);
}
protected final ExecutionContext createExecutionContext(Request req) {
return createExecutionContext(req.getOriginalRequest());
}
/**
* @deprecated by {@link #createExecutionContext(KscWebServiceRequest)}.
*
* This method exists only for backward compatiblity reason, so
* that clients compiled against the older version of this class
* won't get {@link NoSuchMethodError} at runtime. However,
* calling this methods would effectively ignore and disable the
* request metric collector, if any, specified at the request
* level. Request metric collector specified at the service
* client or AWS SDK level will still be honored.
*/
@Deprecated
protected final ExecutionContext createExecutionContext() {
boolean isMetricsEnabled = isRMCEnabledAtClientOrSdkLevel() || isProfilingEnabled();
return new ExecutionContext(requestHandler2s, isMetricsEnabled, this);
}
/* Check the profiling system property and return true if set */
protected static boolean isProfilingEnabled() {
return System.getProperty(PROFILING_SYSTEM_PROPERTY) != null;
}
/**
* Returns true if request metric collection is applicable to the given
* request; false otherwise.
*/
protected final boolean isRequestMetricsEnabled(KscWebServiceRequest req) {
RequestMetricCollector c = req.getRequestMetricCollector(); // request level collector
if (c != null && c.isEnabled()) {
return true;
}
return isRMCEnabledAtClientOrSdkLevel();
}
/**
* Returns true if request metric collection is enabled at the service
* client or AWS SDK level request; false otherwise.
*/
private boolean isRMCEnabledAtClientOrSdkLevel() {
RequestMetricCollector c = requestMetricCollector();
return c != null && c.isEnabled();
}
/**
* Sets the optional value for time offset for this client. This
* value will be applied to all requests processed through this client.
* Value is in seconds, positive values imply the current clock is "fast",
* negative values imply clock is slow.
*
* @param timeOffset
* The optional value for time offset (in seconds) for this client.
*/
public void setTimeOffset(int timeOffset) {
this.timeOffset = timeOffset;
}
/**
* Sets the optional value for time offset for this client. This
* value will be applied to all requests processed through this client.
* Value is in seconds, positive values imply the current clock is "fast",
* negative values imply clock is slow.
*
* @param timeOffset
* The optional value for time offset (in seconds) for this client.
*
* @return the updated web service client
*/
public KscWebServiceClient withTimeOffset(int timeOffset) {
setTimeOffset(timeOffset);
return this;
}
/**
* Returns the optional value for time offset for this client. This
* value will be applied to all requests processed through this client.
* Value is in seconds, positive values imply the current clock is "fast",
* negative values imply clock is slow.
*
* @return The optional value for time offset (in seconds) for this client.
*/
public int getTimeOffset() {
return timeOffset;
}
/**
* Returns the client specific {@link RequestMetricCollector}; or null if
* there is none.
*/
public RequestMetricCollector getRequestMetricsCollector() {
return client.getRequestMetricCollector();
}
/**
* Returns the client specific request metric collector if there is one; or
* the one at the AWS SDK level otherwise.
*/
protected RequestMetricCollector requestMetricCollector() {
RequestMetricCollector mc = client.getRequestMetricCollector();
return mc == null ? KscSdkMetrics.getRequestMetricCollector() : mc;
}
/**
* Returns the most specific request metric collector, starting from the
* request level, then client level, then finally the AWS SDK level.
*/
protected final RequestMetricCollector findRequestMetricCollector(Request req) {
KscWebServiceRequest origReq = req.getOriginalRequest();
RequestMetricCollector mc = origReq.getRequestMetricCollector();
if (mc != null) {
return mc;
}
mc = getRequestMetricsCollector();
return mc == null ? KscSdkMetrics.getRequestMetricCollector() : mc;
}
/**
* Convenient method to end the client execution without logging the
* awsRequestMetrics.
*/
protected final void endClientExecution(
KscRequestMetrics awsRequestMetrics, Request request,
Response response) {
this.endClientExecution(awsRequestMetrics, request, response,
!LOGGING_AWS_REQUEST_METRIC);
}
/**
* Common routine to end a client AWS request/response execution and collect
* the request metrics. Caller of this routine is responsible for starting
* the event for {@link Field#ClientExecuteTime} and call this method
* in a try-finally block.
*
* @param loggingAwsRequestMetrics deprecated and ignored
*/
protected final void endClientExecution(
KscRequestMetrics awsRequestMetrics, Request request,
Response response, @Deprecated boolean loggingAwsRequestMetrics) {
if (request != null) {
awsRequestMetrics.endEvent(Field.ClientExecuteTime);
awsRequestMetrics.getTimingInfo().endTiming();
RequestMetricCollector c = findRequestMetricCollector(request);
c.collectMetrics(request, response);
awsRequestMetrics.log();
}
}
/**
* @deprecated by {@link #getServiceName()}.
*/
@Deprecated
protected String getServiceAbbreviation() {
return getServiceNameIntern();
}
/**
* Returns the service abbreviation for this service, used for identifying
* service endpoints by region, identifying the necessary signer, etc.
* Used to be call "getServiceAbbreviation".
*/
public String getServiceName() {
return getServiceNameIntern();
}
/**
* @return the service name that should be used when computing the region
* endpoints. This method returns the value of the
* regionMetadataServiceName configuration in the internal config
* file if such configuration is specified for the current client,
* otherwise it returns the same service name that is used for
* request signing.
*/
public String getEndpointPrefix() {
if (endpointPrefix != null) return endpointPrefix;
String httpClientName = getHttpClientName();
String serviceNameInRegionMetadata = ServiceNameFactory
.getServiceNameInRegionMetadata(httpClientName);
synchronized(this) {
if (endpointPrefix != null) return endpointPrefix;
if (serviceNameInRegionMetadata != null) {
return endpointPrefix = serviceNameInRegionMetadata;
} else {
return endpointPrefix = getServiceNameIntern();
}
}
}
/**
* An internal method used to explicitly override the service name for region metadata.
* This service name is used to compute the region endpoints.
*/
protected void setEndpointPrefix(String endpointPrefix) {
if (endpointPrefix == null) {
throw new IllegalArgumentException(
"The parameter endpointPrefix must be specified!");
}
this.endpointPrefix = endpointPrefix;
}
/**
* Internal method for implementing {@link #getServiceName()}. Method is
* protected by intent so peculiar subclass that don't follow the class
* naming convention can choose to return whatever service name as needed.
*/
protected String getServiceNameIntern() {
if (serviceName == null) {
synchronized(this) {
if (serviceName == null) {
return serviceName = computeServiceName();
}
}
}
return serviceName;
}
/**
* An internal method used to explicitly override the service name
* computed by the default implementation. This method is not expected to be
* normally called except for AWS internal development purposes.
*/
public final void setServiceNameIntern(String serviceName) {
if (serviceName == null)
throw new IllegalArgumentException(
"The parameter serviceName must be specified!");
this.serviceName = serviceName;
}
/**
* Returns the service name of this AWS http client by first looking it up
* from the SDK internal configuration, and if not found, derive it from the
* class name of the immediate subclass of {@link KscWebServiceClient}.
* No configuration is necessary if the simple class name of the http client
* follows the convention of (ksyun|KSC).*(JavaClient|Client).
*/
private String computeServiceName() {
final String httpClientName = getHttpClientName();
String service = ServiceNameFactory.getServiceName(httpClientName);
if (service != null) {
return service; // only if it is so explicitly configured
}
// Otherwise, make use of convention over configuration
int j = httpClientName.indexOf("JavaClient");
if (j == -1) {
j = httpClientName.indexOf("Client");
if (j == -1) {
throw new IllegalStateException(
"Unrecognized suffix for the AWS http client class name "
+ httpClientName);
}
}
int i = httpClientName.indexOf(KSYUN);
int len;
if (i == -1) {
i = httpClientName.indexOf(KSC);
if (i == -1) {
throw new IllegalStateException(
"Unrecognized prefix for the KSC http client class name "
+ httpClientName);
}
len = KSC.length();
} else {
len = KSYUN.length();
}
if (i >= j) {
throw new IllegalStateException(
"Unrecognized AWS http client class name " + httpClientName);
}
String serviceName = httpClientName.substring(i + len, j);
return StringUtils.lowerCase(serviceName);
}
private String getHttpClientName() {
Class httpClientClass = Classes.childClassOf(
KscWebServiceClient.class, this);
return httpClientClass.getSimpleName();
}
/**
* Returns the signer region override.
*
* @see #setSignerRegionOverride(String).
*/
public final String getSignerRegionOverride() {
return signerRegionOverride;
}
/**
* An internal method used to explicitly override the internal signer region
* computed by the default implementation. This method is not expected to be
* normally called except for AWS internal development purposes.
*/
public final void setSignerRegionOverride(String signerRegionOverride) {
Signer signer = computeSignerByURI(endpoint, signerRegionOverride, true);
synchronized(this) {
this.signer = signer;
this.signerRegionOverride = signerRegionOverride;
}
}
/**
* Fluent method for {@link #setRegion(Region)}.
*
* Example:
*
* AmazonDynamoDBClient client = new AmazonDynamoDBClient(...).withRegion(...);
*
* @see #setRegion(Region)
*/
public T withRegion(Region region) {
setRegion(region);
@SuppressWarnings("unchecked") T t= (T)this;
return t;
}
/**
* Convenient fluent method for setting region.
*
* @param region region to set to; must not be null.
*
* @see #withRegion(Region)
*/
public T withRegion(Regions region) {
configureRegion(region);
@SuppressWarnings("unchecked") T t= (T)this;
return t;
}
/**
* Fluent method for {@link #setEndpoint(String)}.
*
* Example:
*
* AmazonDynamoDBClient client = new AmazonDynamoDBClient(...).withEndPoint(...);
*
* @see #setEndpoint(String)
*/
public T withEndpoint(String endpoint) {
setEndpoint(endpoint);
@SuppressWarnings("unchecked") T t= (T)this;
return t;
}
}