net.ltgt.resteasy.client.okhttp.OkHttpClientEngine.java Source code

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Here is the source code for net.ltgt.resteasy.client.okhttp.OkHttpClientEngine.java

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/*
 * Copyright (C) 2015 Thomas Broyer (t.broyer@ltgt.net)
 *
 * 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 net.ltgt.resteasy.client.okhttp;

import java.io.IOException;
import java.io.InputStream;
import java.util.List;
import java.util.Map;

import javax.net.ssl.HostnameVerifier;
import javax.net.ssl.SSLContext;
import javax.ws.rs.ProcessingException;
import javax.ws.rs.core.MultivaluedMap;

import org.jboss.resteasy.client.jaxrs.ClientHttpEngine;
import org.jboss.resteasy.client.jaxrs.internal.ClientInvocation;
import org.jboss.resteasy.client.jaxrs.internal.ClientResponse;
import org.jboss.resteasy.util.CaseInsensitiveMap;

import com.squareup.okhttp.Headers;
import com.squareup.okhttp.MediaType;
import com.squareup.okhttp.OkHttpClient;
import com.squareup.okhttp.Request;
import com.squareup.okhttp.RequestBody;
import com.squareup.okhttp.Response;

import okio.Buffer;
import okio.BufferedSink;

/**
 * Implementation of {@link ClientHttpEngine} based on OkHttp.
 *
 * <p>Usage:
 * <pre><code>
new ResteasyClientBuilder()
 .httpEngine(new OkHttpClientEngine(okHttpClient))
 .build()
 * </code></pre>
 *
 * @author Thomas Broyer <t.broyer@ltgt.net>
 */
public class OkHttpClientEngine implements ClientHttpEngine {

    private final OkHttpClient client;

    private SSLContext sslContext;

    public OkHttpClientEngine(OkHttpClient client) {
        this.client = client;
    }

    @Override
    public SSLContext getSslContext() {
        return sslContext;
    }

    public void setSslContext(SSLContext sslContext) {
        this.sslContext = sslContext;
    }

    @Override
    public HostnameVerifier getHostnameVerifier() {
        return client.getHostnameVerifier();
    }

    @Override
    public ClientResponse invoke(ClientInvocation request) {
        Request req = createRequest(request);
        Response response;
        try {
            response = client.newCall(req).execute();
        } catch (IOException e) {
            throw new ProcessingException("Unable to invoke request", e);
        }
        return createResponse(request, response);
    }

    private Request createRequest(ClientInvocation request) {
        Request.Builder builder = new Request.Builder().method(request.getMethod(), createRequestBody(request))
                .url(request.getUri().toString());
        for (Map.Entry<String, List<String>> header : request.getHeaders().asMap().entrySet()) {
            String headerName = header.getKey();
            for (String headerValue : header.getValue()) {
                builder.addHeader(headerName, headerValue);
            }
        }
        return builder.build();
    }

    private RequestBody createRequestBody(final ClientInvocation request) {
        if (request.getEntity() == null) {
            return null;
        }

        // NOTE: this will invoke WriterInterceptors which can possibly change the request,
        // so it must be done first, before reading any header.
        final Buffer buffer = new Buffer();
        try {
            request.writeRequestBody(buffer.outputStream());
        } catch (IOException e) {
            throw new RuntimeException(e);
        }

        javax.ws.rs.core.MediaType mediaType = request.getHeaders().getMediaType();
        final MediaType contentType = (mediaType == null) ? null : MediaType.parse(mediaType.toString());

        return new RequestBody() {
            @Override
            public long contentLength() throws IOException {
                return buffer.size();
            }

            @Override
            public MediaType contentType() {
                return contentType;
            }

            @Override
            public void writeTo(BufferedSink sink) throws IOException {
                sink.write(buffer, buffer.size());
            }
        };
    }

    private ClientResponse createResponse(ClientInvocation request, final Response response) {
        ClientResponse clientResponse = new ClientResponse(request.getClientConfiguration()) {
            private InputStream stream;

            @Override
            protected InputStream getInputStream() {
                if (stream == null) {
                    try {
                        stream = response.body().byteStream();
                    } catch (IOException e) {
                        throw new RuntimeException(e);
                    }
                }
                return stream;
            }

            @Override
            protected void setInputStream(InputStream is) {
                stream = is;
            }

            @Override
            public void releaseConnection() throws IOException {
                // Stream might have been entirely replaced, so we need to close it independently from response.body()
                Throwable primaryExc = null;
                try {
                    if (stream != null) {
                        stream.close();
                    }
                } catch (Throwable t) {
                    primaryExc = t;
                    throw t;
                } finally {
                    if (primaryExc != null) {
                        try {
                            response.body().close();
                        } catch (Throwable suppressedExc) {
                            primaryExc.addSuppressed(suppressedExc);
                        }
                    } else {
                        response.body().close();
                    }
                }
            }
        };

        clientResponse.setStatus(response.code());
        clientResponse.setHeaders(transformHeaders(response.headers()));

        return clientResponse;
    }

    private MultivaluedMap<String, String> transformHeaders(Headers headers) {
        MultivaluedMap<String, String> ret = new CaseInsensitiveMap<>();
        for (int i = 0, l = headers.size(); i < l; i++) {
            ret.add(headers.name(i), headers.value(i));
        }
        return ret;
    }

    @Override
    public void close() {
        // no-op
    }
}