/*
* Copyright 2014 Proofpoint, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License 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.proofpoint.http.client;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.exc.InvalidFormatException;
import com.fasterxml.jackson.dataformat.smile.SmileFactory;
import com.google.common.base.Supplier;
import com.google.common.base.Suppliers;
import com.google.common.collect.ImmutableListMultimap;
import com.google.common.collect.ListMultimap;
import com.google.common.net.MediaType;
import com.proofpoint.http.client.FullSmileResponseHandler.SmileResponse;
import com.proofpoint.json.JsonCodec;
import com.proofpoint.json.ObjectMapperProvider;
import java.io.IOException;
import java.io.InputStream;
import java.util.List;
import static com.google.common.base.MoreObjects.toStringHelper;
import static com.google.common.net.HttpHeaders.CONTENT_TYPE;
import static com.proofpoint.http.client.ResponseHandlerUtils.propagate;
public class FullSmileResponseHandler<T>
implements ResponseHandler<SmileResponse<T>, RuntimeException>
{
private static final MediaType MEDIA_TYPE_SMILE = MediaType.create("application", "x-jackson-smile");
public static <T> FullSmileResponseHandler<T> createFullSmileResponseHandler(JsonCodec<T> jsonCodec)
{
return new FullSmileResponseHandler<>(jsonCodec);
}
private final JsonCodec<T> jsonCodec;
private FullSmileResponseHandler(JsonCodec<T> jsonCodec)
{
this.jsonCodec = jsonCodec;
}
@Override
public SmileResponse<T> handleException(Request request, Exception exception)
{
throw propagate(request, exception);
}
@Override
public SmileResponse<T> handle(Request request, Response response)
{
String contentType = response.getHeader(CONTENT_TYPE);
if ((contentType == null) || !MediaType.parse(contentType).is(MEDIA_TYPE_SMILE)) {
return new SmileResponse<>(response.getStatusCode(), response.getStatusMessage(), response.getHeaders());
}
try {
return new SmileResponse<>(response.getStatusCode(), response.getStatusMessage(), response.getHeaders(), jsonCodec, response.getInputStream());
}
catch (IOException e) {
throw new RuntimeException("Error reading SMILE response from server", e);
}
}
public static class SmileResponse<T>
{
private static final Supplier<ObjectMapper> OBJECT_MAPPER_SUPPLIER = Suppliers.memoize(new Supplier<ObjectMapper>()
{
@Override
public ObjectMapper get()
{
return new ObjectMapperProvider().get();
}
});
private final int statusCode;
private final String statusMessage;
private final ListMultimap<String, String> headers;
private final boolean hasValue;
private final T value;
private final IllegalArgumentException exception;
public SmileResponse(int statusCode, String statusMessage, ListMultimap<String, String> headers)
{
this.statusCode = statusCode;
this.statusMessage = statusMessage;
this.headers = ImmutableListMultimap.copyOf(headers);
this.hasValue = false;
this.value = null;
this.exception = null;
}
@SuppressWarnings("ThrowableInstanceNeverThrown")
public SmileResponse(int statusCode, String statusMessage, ListMultimap<String, String> headers, JsonCodec<T> jsonCodec, InputStream inputStream)
throws IOException
{
this.statusCode = statusCode;
this.statusMessage = statusMessage;
this.headers = ImmutableListMultimap.copyOf(headers);
T value = null;
IllegalArgumentException exception = null;
try {
JsonParser jsonParser = new SmileFactory().createParser(inputStream);
ObjectMapper objectMapper = OBJECT_MAPPER_SUPPLIER.get();
// Important: we are NOT to close the underlying stream after
// mapping, so we need to instruct parser:
jsonParser.disable(JsonParser.Feature.AUTO_CLOSE_SOURCE);
value = objectMapper.readValue(jsonParser, objectMapper.getTypeFactory().constructType(jsonCodec.getType()));
}
catch (InvalidFormatException e) {
exception = new IllegalArgumentException("Unable to create " + jsonCodec.getType() + " from SMILE response", e);
}
this.hasValue = (exception == null);
this.value = value;
this.exception = exception;
}
public int getStatusCode()
{
return statusCode;
}
public String getStatusMessage()
{
return statusMessage;
}
public String getHeader(String name)
{
List<String> values = getHeaders().get(name);
if (values.isEmpty()) {
return null;
}
return values.get(0);
}
public ListMultimap<String, String> getHeaders()
{
return headers;
}
public boolean hasValue()
{
return hasValue;
}
public T getValue()
{
if (!hasValue) {
throw new IllegalStateException("Response does not contain a SMILE value", exception);
}
return value;
}
public IllegalArgumentException getException()
{
return exception;
}
@Override
public String toString()
{
return toStringHelper(this)
.add("statusCode", statusCode)
.add("statusMessage", statusMessage)
.add("headers", headers)
.add("hasValue", hasValue)
.add("value", value)
.toString();
}
}
}