io.sphere.internal.request.RequestExecutor Maven / Gradle / Ivy
package io.sphere.internal.request;
import com.google.common.base.Charsets;
import com.google.common.base.Function;
import com.google.common.base.Optional;
import com.google.common.base.Strings;
import com.google.common.util.concurrent.Futures;
import com.google.common.util.concurrent.ListenableFuture;
import com.ning.http.client.AsyncCompletionHandler;
import com.ning.http.client.Response;
import io.sphere.client.exceptions.SphereException;
import io.sphere.internal.errors.SphereErrorResponse;
import io.sphere.internal.util.Log;
import io.sphere.internal.util.Util;
import io.sphere.client.exceptions.SphereBackendException;
import org.codehaus.jackson.map.DeserializationConfig;
import org.codehaus.jackson.map.ObjectMapper;
import org.codehaus.jackson.type.TypeReference;
import javax.annotation.Nullable;
import java.io.IOException;
public class RequestExecutor {
private static final ObjectMapper jsonParser = new ObjectMapper().configure(DeserializationConfig.Feature.FAIL_ON_UNKNOWN_PROPERTIES, false);
private static final TypeReference errorResponseJsonTypeRef = new TypeReference() {};
/** Executes request and parses JSON response.
*
* Throws a {@link SphereBackendException} on any response with status other than 2xx.
*
* Use this method when sending requests to endpoints that are only expected to fail in conditions
* which shouldn't be handled by the application (such as programmer error, or 500 from Sphere),
* e.g. /product-projections/search. */
public static ListenableFuture executeAndThrowOnError(
final RequestHolder requestHolder, final TypeReference jsonParserTypeRef)
{
return Futures.transform(execute(requestHolder, jsonParserTypeRef), new Function, T>() {
public T apply(@Nullable SphereResultRaw result) {
if (result.isError()) {
throw Util.toSphereException(result.getError());
}
return result.getValue();
}
});
}
/** Support for FetchRequest. Executes request and parses JSON response.
*
* Returns {@code Optional.absent} if the backend responds with given status code.
*
* Use this version when sending requests to endpoints where e.g. 404 Not Found is expected. */
public static ListenableFuture> executeAndHandleError(
final RequestHolder requestHolder, final int handledErrorStatus, final TypeReference jsonParserTypeRef)
{
return Futures.transform(execute(requestHolder, jsonParserTypeRef), new Function, Optional>() {
public Optional apply(SphereResultRaw result) {
if (result.isError()) {
if (result.getError().getStatusCode() == handledErrorStatus) {
return Optional.absent();
} else {
// An unexpected error response that shouldn't happen with FetchRequests. Fail the future.
throw Util.toSphereException(result.getError());
}
}
return Optional.of(result.getValue());
}
});
}
/** Executes request and parses JSON response as given type. */
public static ListenableFuture> execute(final RequestHolder requestHolder, final TypeReference jsonParserTypeRef)
{
try {
return requestHolder.executeRequest(new AsyncCompletionHandler>() {
public SphereResultRaw onCompleted(Response response) throws Exception {
int status = response.getStatusCode();
String body = response.getResponseBody(Charsets.UTF_8.name());
if (status / 100 != 2) {
SphereErrorResponse errorResponse = null;
try {
errorResponse = jsonParser.readValue(body, errorResponseJsonTypeRef);
} catch (Exception e) {
// This can only happen when the backend and SDK don't match.
Log.error(
"Can't parse backend response: \n[" + status + "]\n" + body + "\n\nRequest: " + requestHolderToString(requestHolder));
throw new SphereException("Can't parse backend response.", e);
}
if (Log.isErrorEnabled()) {
Log.error(errorResponse + "\n\nRequest: " + requestHolderToString(requestHolder));
}
return SphereResultRaw.error(new SphereBackendException(requestHolder.getUrl(), errorResponse));
} else {
if (Log.isTraceEnabled()) {
Log.trace(requestHolderToString(requestHolder) + "\n" +
"=> " + response.getStatusCode() + "\n" +
Util.prettyPrintJsonStringSecure(body) + "\n");
} else if (Log.isDebugEnabled()) {
Log.debug(requestHolderToString(requestHolder));
}
return SphereResultRaw.success(jsonParser.readValue(body, jsonParserTypeRef));
}
}
});
} catch (Exception e) {
throw Util.toSphereException(e);
}
}
private static String requestHolderToString(RequestHolder requestHolder) {
try {
return requestHolder.getMethod() + " " +
requestHolder.getUrl() +
(Strings.isNullOrEmpty(requestHolder.getBody()) ?
"" :
"\n" + Util.prettyPrintJsonStringSecure(requestHolder.getBody()));
} catch(IOException e) {
throw Util.toSphereException(e);
}
}
}