/**
* Returns true if a failed request should be retried.
*
* @param originalRequest The original service request that is being executed.
* @param method The current HTTP method being executed.
* @param exception The client/service exception from the failed request.
* @param requestCount The number of times the current request has been attempted.
* @return True if the failed request should be retried.
*/
private boolean shouldRetry(
AmazonWebServiceRequest originalRequest,
HttpRequestBase method,
AmazonClientException exception,
int requestCount,
RetryPolicy retryPolicy) {
final int retries = requestCount - 1;
int maxErrorRetry = config.getMaxErrorRetry();
// We should use the maxErrorRetry in
// the RetryPolicy if either the user has not explicitly set it in
// ClientConfiguration, or the RetryPolicy is configured to take
// higher precedence.
if (maxErrorRetry < 0 || !retryPolicy.isMaxErrorRetryInClientConfigHonored()) {
maxErrorRetry = retryPolicy.getMaxErrorRetry();
}
// Immediately fails when it has exceeds the max retry count.
if (retries >= maxErrorRetry) return false;
// Never retry on requests containing non-repeatable entity
if (method instanceof HttpEntityEnclosingRequest) {
HttpEntity entity = ((HttpEntityEnclosingRequest) method).getEntity();
if (entity != null && !entity.isRepeatable()) {
if (log.isDebugEnabled()) {
log.debug("Entity not repeatable");
}
return false;
}
}
// Pass all the context information to the RetryCondition and let it
// decide whether it should be retried.
return retryPolicy.getRetryCondition().shouldRetry(originalRequest, exception, retries);
}
static void enhanceEntity(final HttpEntityEnclosingRequest request) {
final HttpEntity entity = request.getEntity();
if (entity != null && !entity.isRepeatable() && !isEnhanced(entity)) {
final HttpEntity proxy =
(HttpEntity)
Proxy.newProxyInstance(
HttpEntity.class.getClassLoader(),
new Class<?>[] {HttpEntity.class},
new RequestEntityExecHandler(entity));
request.setEntity(proxy);
}
}
static boolean isRepeatable(final HttpRequest request) {
if (request instanceof HttpEntityEnclosingRequest) {
final HttpEntity entity = ((HttpEntityEnclosingRequest) request).getEntity();
if (entity != null) {
if (isEnhanced(entity)) {
final RequestEntityExecHandler handler =
(RequestEntityExecHandler) Proxy.getInvocationHandler(entity);
if (!handler.isConsumed()) {
return true;
}
}
return entity.isRepeatable();
}
}
return true;
}
/**
* Returns true if a failed request should be retried.
*
* @param method The current HTTP method being executed.
* @param exception The exception from the failed request.
* @param retries The number of times the current request has been attempted.
* @return True if the failed request should be retried.
*/
private boolean shouldRetry(HttpRequestBase method, Exception exception, int retries) {
if (retries >= config.getMaxErrorRetry()) return false;
if (method instanceof HttpEntityEnclosingRequest) {
HttpEntity entity = ((HttpEntityEnclosingRequest) method).getEntity();
if (entity != null && !entity.isRepeatable()) {
if (log.isDebugEnabled()) {
log.debug("Entity not repeatable");
}
return false;
}
}
if (exception instanceof IOException) {
if (log.isDebugEnabled()) {
log.debug("Retrying on " + exception.getClass().getName() + ": " + exception.getMessage());
}
return true;
}
if (exception instanceof AmazonServiceException) {
AmazonServiceException ase = (AmazonServiceException) exception;
/*
* For 500 internal server errors and 503 service
* unavailable errors, we want to retry, but we need to use
* an exponential back-off strategy so that we don't overload
* a server with a flood of retries. If we've surpassed our
* retry limit we handle the error response as a non-retryable
* error and go ahead and throw it back to the user as an exception.
*/
if (ase.getStatusCode() == HttpStatus.SC_INTERNAL_SERVER_ERROR
|| ase.getStatusCode() == HttpStatus.SC_SERVICE_UNAVAILABLE) {
return true;
}
/*
* Throttling is reported as a 400 error from newer services. To try
* and smooth out an occasional throttling error, we'll pause and
* retry, hoping that the pause is long enough for the request to
* get through the next time.
*/
if (isThrottlingException(ase)) return true;
}
return false;
}
/** Generates a cURL command equivalent to the given request. */
private static String toCurl(HttpUriRequest request) throws IOException {
StringBuilder builder = new StringBuilder();
builder.append("curl ");
for (Header header : request.getAllHeaders()) {
builder.append("--header \"");
builder.append(header.toString().trim());
builder.append("\" ");
}
URI uri = request.getURI();
// If this is a wrapped request, use the URI from the original
// request instead. getURI() on the wrapper seems to return a
// relative URI. We want an absolute URI.
if (request instanceof RequestWrapper) {
HttpRequest original = ((RequestWrapper) request).getOriginal();
if (original instanceof HttpUriRequest) {
uri = ((HttpUriRequest) original).getURI();
}
}
builder.append("\"");
builder.append(uri);
builder.append("\"");
if (request instanceof HttpEntityEnclosingRequest) {
HttpEntityEnclosingRequest entityRequest = (HttpEntityEnclosingRequest) request;
HttpEntity entity = entityRequest.getEntity();
if (entity != null && entity.isRepeatable()) {
if (entity.getContentLength() < 1024) {
ByteArrayOutputStream stream = new ByteArrayOutputStream();
entity.writeTo(stream);
String entityString = stream.toString();
// TODO: Check the content type, too.
builder.append(" --data-ascii \"").append(entityString).append("\"");
} else {
builder.append(" [TOO MUCH DATA TO INCLUDE]");
}
}
}
return builder.toString();
}
protected void processAndAddLastClientInvocation(
GenericClient theClient,
ResultType theResultType,
ModelMap theModelMap,
long theLatency,
String outcomeDescription,
CaptureInterceptor theInterceptor,
HomeRequest theRequest) {
try {
HttpRequestBase lastRequest = theInterceptor.getLastRequest();
HttpResponse lastResponse = theInterceptor.getLastResponse();
String requestBody = null;
String requestUrl = lastRequest != null ? lastRequest.getURI().toASCIIString() : null;
String action = lastRequest != null ? lastRequest.getMethod() : null;
String resultStatus = lastResponse != null ? lastResponse.getStatusLine().toString() : null;
String resultBody = StringUtils.defaultString(theInterceptor.getLastResponseBody());
if (lastRequest instanceof HttpEntityEnclosingRequest) {
HttpEntity entity = ((HttpEntityEnclosingRequest) lastRequest).getEntity();
if (entity.isRepeatable()) {
requestBody = IOUtils.toString(entity.getContent());
}
}
ContentType ct = lastResponse != null ? ContentType.get(lastResponse.getEntity()) : null;
String mimeType = ct != null ? ct.getMimeType() : null;
EncodingEnum ctEnum = EncodingEnum.forContentType(mimeType);
String narrativeString = "";
StringBuilder resultDescription = new StringBuilder();
Bundle bundle = null;
IBaseResource riBundle = null;
FhirContext context = getContext(theRequest);
if (ctEnum == null) {
resultDescription.append("Non-FHIR response");
} else {
switch (ctEnum) {
case JSON:
if (theResultType == ResultType.RESOURCE) {
narrativeString = parseNarrative(theRequest, ctEnum, resultBody);
resultDescription.append("JSON resource");
} else if (theResultType == ResultType.BUNDLE) {
resultDescription.append("JSON bundle");
if (context.getVersion().getVersion().isRi()) {
riBundle = context.newJsonParser().parseResource(resultBody);
} else {
bundle = context.newJsonParser().parseBundle(resultBody);
}
}
break;
case XML:
default:
if (theResultType == ResultType.RESOURCE) {
narrativeString = parseNarrative(theRequest, ctEnum, resultBody);
resultDescription.append("XML resource");
} else if (theResultType == ResultType.BUNDLE) {
resultDescription.append("XML bundle");
if (context.getVersion().getVersion().isRi()) {
riBundle = context.newXmlParser().parseResource(resultBody);
} else {
bundle = context.newXmlParser().parseBundle(resultBody);
}
}
break;
}
}
resultDescription.append(" (").append(resultBody.length() + " bytes)");
Header[] requestHeaders =
lastRequest != null ? applyHeaderFilters(lastRequest.getAllHeaders()) : new Header[0];
Header[] responseHeaders =
lastResponse != null ? applyHeaderFilters(lastResponse.getAllHeaders()) : new Header[0];
theModelMap.put("outcomeDescription", outcomeDescription);
theModelMap.put("resultDescription", resultDescription.toString());
theModelMap.put("action", action);
theModelMap.put("bundle", bundle);
theModelMap.put("riBundle", riBundle);
theModelMap.put("resultStatus", resultStatus);
theModelMap.put("requestUrl", requestUrl);
theModelMap.put("requestUrlText", formatUrl(theClient.getUrlBase(), requestUrl));
String requestBodyText = format(requestBody, ctEnum);
theModelMap.put("requestBody", requestBodyText);
String resultBodyText = format(resultBody, ctEnum);
theModelMap.put("resultBody", resultBodyText);
theModelMap.put("resultBodyIsLong", resultBodyText.length() > 1000);
theModelMap.put("requestHeaders", requestHeaders);
theModelMap.put("responseHeaders", responseHeaders);
theModelMap.put("narrative", narrativeString);
theModelMap.put("latencyMs", theLatency);
} catch (Exception e) {
ourLog.error("Failure during processing", e);
theModelMap.put("errorMsg", "Error during processing: " + e.getMessage());
}
}
public boolean isRepeatable() {
return delegate.isRepeatable();
}
<T> T invokeClient(
FhirContext theContext,
IClientResponseHandler<T> binding,
BaseHttpClientInvocation clientInvocation,
EncodingEnum theEncoding,
Boolean thePrettyPrint,
boolean theLogRequestAndResponse) {
if (!myDontValidateConformance) {
myFactory.validateServerBaseIfConfiguredToDoSo(myUrlBase, myClient, this);
}
// TODO: handle non 2xx status codes by throwing the correct exception,
// and ensure it's passed upwards
HttpRequestBase httpRequest;
HttpResponse response;
try {
Map<String, List<String>> params = createExtraParams();
if (theEncoding == EncodingEnum.XML) {
params.put(Constants.PARAM_FORMAT, Collections.singletonList("xml"));
} else if (theEncoding == EncodingEnum.JSON) {
params.put(Constants.PARAM_FORMAT, Collections.singletonList("json"));
}
if (thePrettyPrint == Boolean.TRUE) {
params.put(
Constants.PARAM_PRETTY, Collections.singletonList(Constants.PARAM_PRETTY_VALUE_TRUE));
}
EncodingEnum encoding = getEncoding();
if (theEncoding != null) {
encoding = theEncoding;
}
httpRequest = clientInvocation.asHttpRequest(myUrlBase, params, encoding, thePrettyPrint);
if (theLogRequestAndResponse) {
ourLog.info("Client invoking: {}", httpRequest);
if (httpRequest instanceof HttpEntityEnclosingRequest) {
HttpEntity entity = ((HttpEntityEnclosingRequest) httpRequest).getEntity();
if (entity.isRepeatable()) {
String content = IOUtils.toString(entity.getContent());
ourLog.info("Client request body: {}", content);
}
}
}
for (IClientInterceptor nextInterceptor : myInterceptors) {
nextInterceptor.interceptRequest(httpRequest);
}
response = myClient.execute(httpRequest);
for (IClientInterceptor nextInterceptor : myInterceptors) {
nextInterceptor.interceptResponse(response);
}
} catch (DataFormatException e) {
throw new FhirClientConnectionException(e);
} catch (IOException e) {
throw new FhirClientConnectionException(e);
}
try {
String mimeType;
if (Constants.STATUS_HTTP_204_NO_CONTENT == response.getStatusLine().getStatusCode()) {
mimeType = null;
} else {
ContentType ct = ContentType.get(response.getEntity());
mimeType = ct != null ? ct.getMimeType() : null;
}
Map<String, List<String>> headers = new HashMap<String, List<String>>();
if (response.getAllHeaders() != null) {
for (Header next : response.getAllHeaders()) {
String name = next.getName().toLowerCase();
List<String> list = headers.get(name);
if (list == null) {
list = new ArrayList<String>();
headers.put(name, list);
}
list.add(next.getValue());
}
}
if (response.getStatusLine().getStatusCode() < 200
|| response.getStatusLine().getStatusCode() > 299) {
String body = null;
Reader reader = null;
try {
reader = createReaderFromResponse(response);
body = IOUtils.toString(reader);
} catch (Exception e) {
ourLog.debug("Failed to read input stream", e);
} finally {
IOUtils.closeQuietly(reader);
}
String message =
"HTTP "
+ response.getStatusLine().getStatusCode()
+ " "
+ response.getStatusLine().getReasonPhrase();
BaseOperationOutcome oo = null;
if (Constants.CT_TEXT.equals(mimeType)) {
message = message + ": " + body;
} else {
EncodingEnum enc = EncodingEnum.forContentType(mimeType);
if (enc != null) {
IParser p = enc.newParser(theContext);
try {
// TODO: handle if something other than OO comes back
oo = (BaseOperationOutcome) p.parseResource(body);
if (oo.getIssueFirstRep().getDetailsElement().isEmpty() == false) {
message = message + ": " + oo.getIssueFirstRep().getDetailsElement().getValue();
}
} catch (Exception e) {
ourLog.debug("Failed to process OperationOutcome response");
}
}
}
keepResponseAndLogIt(theLogRequestAndResponse, response, body);
BaseServerResponseException exception =
BaseServerResponseException.newInstance(
response.getStatusLine().getStatusCode(), message);
exception.setOperationOutcome(oo);
if (body != null) {
exception.setResponseBody(body);
}
throw exception;
}
if (binding instanceof IClientResponseHandlerHandlesBinary) {
IClientResponseHandlerHandlesBinary<T> handlesBinary =
(IClientResponseHandlerHandlesBinary<T>) binding;
if (handlesBinary.isBinary()) {
InputStream reader = response.getEntity().getContent();
try {
if (ourLog.isTraceEnabled() || myKeepResponses || theLogRequestAndResponse) {
byte[] responseBytes = IOUtils.toByteArray(reader);
if (myKeepResponses) {
myLastResponse = response;
myLastResponseBody = null;
}
String message =
"HTTP "
+ response.getStatusLine().getStatusCode()
+ " "
+ response.getStatusLine().getReasonPhrase();
if (theLogRequestAndResponse) {
ourLog.info("Client response: {} - {} bytes", message, responseBytes.length);
} else {
ourLog.trace("Client response: {} - {} bytes", message, responseBytes.length);
}
reader = new ByteArrayInputStream(responseBytes);
}
return handlesBinary.invokeClient(
mimeType, reader, response.getStatusLine().getStatusCode(), headers);
} finally {
IOUtils.closeQuietly(reader);
}
}
}
Reader reader = createReaderFromResponse(response);
if (ourLog.isTraceEnabled() || myKeepResponses || theLogRequestAndResponse) {
String responseString = IOUtils.toString(reader);
keepResponseAndLogIt(theLogRequestAndResponse, response, responseString);
reader = new StringReader(responseString);
}
try {
return binding.invokeClient(
mimeType, reader, response.getStatusLine().getStatusCode(), headers);
} finally {
IOUtils.closeQuietly(reader);
}
} catch (IllegalStateException e) {
throw new FhirClientConnectionException(e);
} catch (IOException e) {
throw new FhirClientConnectionException(e);
} finally {
if (response instanceof CloseableHttpResponse) {
try {
((CloseableHttpResponse) response).close();
} catch (IOException e) {
ourLog.debug("Failed to close response", e);
}
}
}
}
@Override
public boolean isRepeatable() {
return src.isRepeatable();
}
@Override
public boolean isRepeatable() {
return httpEntity.isRepeatable();
}