com.orange.retrytest.OkHttpStack.java Source code

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Here is the source code for com.orange.retrytest.OkHttpStack.java

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package com.orange.retrytest;
/*
 * Copyright (C) 2016 Eric Cochran
 *
 * 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.
 */

import com.android.volley.AuthFailureError;
import com.android.volley.Request;
import com.android.volley.toolbox.HttpStack;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.ProtocolVersion;
import org.apache.http.StatusLine;
import org.apache.http.entity.BasicHttpEntity;
import org.apache.http.message.BasicHeader;
import org.apache.http.message.BasicHttpResponse;
import org.apache.http.message.BasicStatusLine;

import java.io.IOException;
import java.util.Map;
import java.util.concurrent.TimeUnit;

import okhttp3.Call;
import okhttp3.Headers;
import okhttp3.MediaType;
import okhttp3.OkHttpClient;
import okhttp3.Protocol;
import okhttp3.RequestBody;
import okhttp3.Response;
import okhttp3.ResponseBody;

/**
 * {@link HttpStack HttpStack} backed by OkHttp 3.
 */
public final class OkHttpStack implements HttpStack {
    private final OkHttpClient client;

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

    @Override
    public HttpResponse performRequest(Request<?> request, Map<String, String> additionalHeaders)
            throws IOException, AuthFailureError {
        OkHttpClient.Builder clientBuilder = client.newBuilder();
        int timeoutMs = request.getTimeoutMs();
        clientBuilder.connectTimeout(timeoutMs, TimeUnit.MILLISECONDS);
        clientBuilder.readTimeout(timeoutMs, TimeUnit.MILLISECONDS);
        clientBuilder.writeTimeout(timeoutMs, TimeUnit.MILLISECONDS);
        OkHttpClient client = clientBuilder.build();

        okhttp3.Request.Builder requestBuilder = new okhttp3.Request.Builder();
        requestBuilder.url(request.getUrl());

        setHeaders(requestBuilder, request, additionalHeaders);
        setConnectionParameters(requestBuilder, request);

        okhttp3.Request okHttpRequest = requestBuilder.build();
        Call okHttpCall = client.newCall(okHttpRequest);
        Response okHttpResponse = okHttpCall.execute();

        StatusLine responseStatus = new BasicStatusLine(parseProtocol(okHttpResponse.protocol()),
                okHttpResponse.code(), okHttpResponse.message());
        BasicHttpResponse response = new BasicHttpResponse(responseStatus);
        response.setEntity(getEntity(okHttpResponse));

        Headers responseHeaders = okHttpResponse.headers();
        for (int i = 0, len = responseHeaders.size(); i < len; i++) {
            response.addHeader(new BasicHeader(responseHeaders.name(i), responseHeaders.value(i)));
        }

        return response;
    }

    private static ProtocolVersion parseProtocol(Protocol p) {
        switch (p) {
        case HTTP_1_0:
            return new ProtocolVersion("HTTP", 1, 0);
        case HTTP_1_1:
            return new ProtocolVersion("HTTP", 1, 1);
        case SPDY_3:
            return new ProtocolVersion("SPDY", 3, 1);
        case HTTP_2:
            return new ProtocolVersion("HTTP", 2, 0);
        }
        throw new IllegalAccessError("Unknown protocol: " + p);
    }

    private static HttpEntity getEntity(Response response) throws IOException {
        BasicHttpEntity entity = new BasicHttpEntity();
        ResponseBody body = response.body();
        entity.setContent(body.byteStream());
        entity.setContentLength(body.contentLength());
        entity.setContentEncoding(response.header("Content-Encoding"));
        if (body.contentType() != null) {
            entity.setContentType(body.contentType().type());
        }
        return entity;
    }

    private static void setHeaders(okhttp3.Request.Builder builder, Request<?> request,
            Map<String, String> additionalHeaders) throws AuthFailureError {
        for (Map.Entry<String, String> entry : request.getHeaders().entrySet()) {
            builder.addHeader(entry.getKey(), entry.getValue());
        }
        for (Map.Entry<String, String> entry : additionalHeaders.entrySet()) {
            builder.addHeader(entry.getKey(), entry.getValue());
        }
    }

    private static void setConnectionParameters(okhttp3.Request.Builder builder, Request<?> request)
            throws AuthFailureError {
        switch (request.getMethod()) {
        case Request.Method.DEPRECATED_GET_OR_POST:
            // Ensure backwards compatibility. Volley assumes a request with a null body is a GET.
            byte[] postBody = request.getPostBody();
            if (postBody == null) {
                builder.get();
            } else {
                builder.post(RequestBody.create(MediaType.parse(request.getPostBodyContentType()), postBody));
            }
            break;
        case Request.Method.GET:
            builder.get();
            break;
        case Request.Method.DELETE:
            builder.delete();
            break;
        case Request.Method.POST:
            builder.post(createRequestBody(request));
            break;
        case Request.Method.PUT:
            builder.put(createRequestBody(request));
            break;
        case Request.Method.HEAD:
            builder.head();
            break;
        case Request.Method.OPTIONS:
            builder.method("OPTIONS", null);
            break;
        case Request.Method.TRACE:
            builder.method("TRACE", null);
            break;
        case Request.Method.PATCH:
            builder.patch(createRequestBody(request));
            break;
        default:
            throw new IllegalStateException("Unknown method type.");
        }
    }

    private static RequestBody createRequestBody(Request r) throws AuthFailureError {
        byte[] body = r.getBody();
        if (body == null) {
            return null;
        }
        return RequestBody.create(MediaType.parse(r.getBodyContentType()), body);
    }
}