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OkHttpClient.java
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204 lines (180 loc) · 6.54 KB
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/*
* Copyright 2012-2023 The Feign Authors
*
* 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.okhttp;
import java.io.IOException;
import java.io.InputStream;
import java.io.Reader;
import java.nio.charset.Charset;
import java.util.Collection;
import java.util.Map;
import java.util.Optional;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.TimeUnit;
import feign.AsyncClient;
import feign.Client;
import feign.Request.HttpMethod;
import feign.Request.ProtocolVersion;
import okhttp3.*;
import static feign.Util.enumForName;
/**
* This module directs Feign's http requests to
* <a href="http://square.github.io/okhttp/">OkHttp</a>, which enables SPDY and better network
* control. Ex.
*
* <pre>
* GitHub github = Feign.builder().client(new OkHttpClient()).target(GitHub.class,
* "https://api.github.com");
*/
public final class OkHttpClient implements Client, AsyncClient<Object> {
private final okhttp3.OkHttpClient delegate;
public OkHttpClient() {
this(new okhttp3.OkHttpClient());
}
public OkHttpClient(okhttp3.OkHttpClient delegate) {
this.delegate = delegate;
}
static Request toOkHttpRequest(feign.Request input) {
Request.Builder requestBuilder = new Request.Builder();
requestBuilder.url(input.url());
MediaType mediaType = null;
boolean hasAcceptHeader = false;
for (String field : input.headers().keySet()) {
if (field.equalsIgnoreCase("Accept")) {
hasAcceptHeader = true;
}
for (String value : input.headers().get(field)) {
requestBuilder.addHeader(field, value);
if (field.equalsIgnoreCase("Content-Type")) {
mediaType = MediaType.parse(value);
if (input.charset() != null) {
mediaType.charset(input.charset());
}
}
}
}
// Some servers choke on the default accept string.
if (!hasAcceptHeader) {
requestBuilder.addHeader("Accept", "*/*");
}
byte[] inputBody = input.body();
if (input.httpMethod().isWithBody()) {
requestBuilder.removeHeader("Content-Type");
if (inputBody == null) {
// write an empty BODY to conform with okhttp 2.4.0+
// http://johnfeng.github.io/blog/2015/06/30/okhttp-updates-post-wouldnt-be-allowed-to-have-null-body/
inputBody = new byte[0];
}
}
RequestBody body = inputBody != null ? RequestBody.create(mediaType, inputBody) : null;
requestBuilder.method(input.httpMethod().name(), body);
return requestBuilder.build();
}
private static feign.Response toFeignResponse(Response response, feign.Request request)
throws IOException {
return feign.Response.builder()
.protocolVersion(enumForName(ProtocolVersion.class, response.protocol()))
.status(response.code())
.reason(response.message())
.request(request)
.headers(toMap(response.headers()))
.body(toBody(response.body()))
.build();
}
private static Map<String, Collection<String>> toMap(Headers headers) {
return (Map) headers.toMultimap();
}
private static feign.Response.Body toBody(final ResponseBody input) throws IOException {
if (input == null || input.contentLength() == 0) {
if (input != null) {
input.close();
}
return null;
}
final Integer length = input.contentLength() >= 0 && input.contentLength() <= Integer.MAX_VALUE
? (int) input.contentLength()
: null;
return new feign.Response.Body() {
@Override
public void close() throws IOException {
input.close();
}
@Override
public Integer length() {
return length;
}
@Override
public boolean isRepeatable() {
return false;
}
@Override
public InputStream asInputStream() throws IOException {
return input.byteStream();
}
@SuppressWarnings("deprecation")
@Override
public Reader asReader() throws IOException {
return input.charStream();
}
@Override
public Reader asReader(Charset charset) throws IOException {
return asReader();
}
};
}
private okhttp3.OkHttpClient getClient(feign.Request.Options options) {
okhttp3.OkHttpClient requestScoped;
if (delegate.connectTimeoutMillis() != options.connectTimeoutMillis()
|| delegate.readTimeoutMillis() != options.readTimeoutMillis()
|| delegate.followRedirects() != options.isFollowRedirects()) {
requestScoped = delegate.newBuilder()
.connectTimeout(options.connectTimeoutMillis(), TimeUnit.MILLISECONDS)
.readTimeout(options.readTimeoutMillis(), TimeUnit.MILLISECONDS)
.followRedirects(options.isFollowRedirects())
.build();
} else {
requestScoped = delegate;
}
return requestScoped;
}
@Override
public feign.Response execute(feign.Request input, feign.Request.Options options)
throws IOException {
okhttp3.OkHttpClient requestScoped = getClient(options);
Request request = toOkHttpRequest(input);
Response response = requestScoped.newCall(request).execute();
return toFeignResponse(response, input).toBuilder().request(input).build();
}
@Override
public CompletableFuture<feign.Response> execute(feign.Request input,
feign.Request.Options options,
Optional<Object> requestContext) {
okhttp3.OkHttpClient requestScoped = getClient(options);
Request request = toOkHttpRequest(input);
CompletableFuture<feign.Response> responseFuture = new CompletableFuture<>();
requestScoped.newCall(request).enqueue(new Callback() {
@Override
public void onFailure(Call call, IOException e) {
responseFuture.completeExceptionally(e);
}
@Override
public void onResponse(Call call, okhttp3.Response response)
throws IOException {
final feign.Response r =
toFeignResponse(response, input).toBuilder().request(input).build();
responseFuture.complete(r);
}
});
return responseFuture;
}
}