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Client.java
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/*
* Copyright 2013 Netflix, 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 feign;
import com.google.common.collect.ImmutableListMultimap;
import com.google.common.io.ByteSink;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.Reader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import javax.inject.Inject;
import javax.net.ssl.HttpsURLConnection;
import javax.net.ssl.SSLSocketFactory;
import dagger.Lazy;
import feign.Request.Options;
import static com.google.common.base.Charsets.UTF_8;
import static com.google.common.net.HttpHeaders.CONTENT_LENGTH;
/**
* Submits HTTP {@link Request requests}. Implementations are expected to be
* thread-safe.
*/
public interface Client {
/**
* Executes a request against its {@link Request#url() url} and returns a
* response.
*
* @param request safe to replay.
* @param options options to apply to this request.
* @return connected response, {@link Response.Body} is absent or unread.
* @throws IOException on a network error connecting to {@link Request#url()}.
*/
Response execute(Request request, Options options) throws IOException;
public static class Default implements Client {
private final Lazy<SSLSocketFactory> sslContextFactory;
@Inject public Default(Lazy<SSLSocketFactory> sslContextFactory) {
this.sslContextFactory = sslContextFactory;
}
@Override public Response execute(Request request, Options options) throws IOException {
HttpURLConnection connection = convertAndSend(request, options);
return convertResponse(connection);
}
HttpURLConnection convertAndSend(Request request, Options options) throws IOException {
final HttpURLConnection connection = (HttpURLConnection) new URL(request.url()).openConnection();
if (connection instanceof HttpsURLConnection) {
HttpsURLConnection sslCon = (HttpsURLConnection) connection;
sslCon.setSSLSocketFactory(sslContextFactory.get());
}
connection.setConnectTimeout(options.connectTimeoutMillis());
connection.setReadTimeout(options.readTimeoutMillis());
connection.setAllowUserInteraction(false);
connection.setInstanceFollowRedirects(true);
connection.setRequestMethod(request.method());
Integer contentLength = null;
for (Entry<String, String> header : request.headers().entries()) {
if (header.getKey().equals(CONTENT_LENGTH))
contentLength = Integer.valueOf(header.getValue());
connection.addRequestProperty(header.getKey(), header.getValue());
}
if (request.body().isPresent()) {
if (contentLength != null) {
connection.setFixedLengthStreamingMode(contentLength);
} else {
connection.setChunkedStreamingMode(8196);
}
connection.setDoOutput(true);
new ByteSink() {
public OutputStream openStream() throws IOException {
return connection.getOutputStream();
}
}.asCharSink(UTF_8).write(request.body().get());
}
return connection;
}
Response convertResponse(HttpURLConnection connection) throws IOException {
int status = connection.getResponseCode();
String reason = connection.getResponseMessage();
ImmutableListMultimap.Builder<String, String> headers = ImmutableListMultimap.builder();
for (Map.Entry<String, List<String>> field : connection.getHeaderFields().entrySet()) {
// response message
if (field.getKey() != null)
headers.putAll(field.getKey(), field.getValue());
}
Integer length = connection.getContentLength();
if (length == -1)
length = null;
InputStream stream;
if (status >= 400) {
stream = connection.getErrorStream();
} else {
stream = connection.getInputStream();
}
Reader body = stream != null ? new InputStreamReader(stream) : null;
return Response.create(status, reason, headers.build(), body, length);
}
}
}