com.teradata.tempto.internal.hadoop.hdfs.SimpleHttpRequestsExecutor.java Source code

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Here is the source code for com.teradata.tempto.internal.hadoop.hdfs.SimpleHttpRequestsExecutor.java

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/*
 * 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.teradata.tempto.internal.hadoop.hdfs;

import com.google.common.base.Throwables;
import com.google.inject.AbstractModule;
import com.google.inject.Inject;
import com.google.inject.Scopes;
import com.google.inject.name.Named;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpRequestWrapper;
import org.apache.http.client.methods.HttpUriRequest;
import org.apache.http.client.utils.URIBuilder;
import org.apache.http.impl.client.CloseableHttpClient;

import java.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;

import static java.util.Objects.requireNonNull;

public class SimpleHttpRequestsExecutor implements HttpRequestsExecutor {
    public static class Module extends AbstractModule {
        @Override
        public void configure() {
            bind(HttpRequestsExecutor.class).to(SimpleHttpRequestsExecutor.class).in(Scopes.SINGLETON);
        }
    }

    private final CloseableHttpClient httpClient;
    private final String username;

    @Inject
    public SimpleHttpRequestsExecutor(CloseableHttpClient httpClient, @Named("hdfs.username") String username) {
        this.httpClient = requireNonNull(httpClient, "httpClient is null");
        this.username = requireNonNull(username, "username is null");
    }

    @Override
    public CloseableHttpResponse execute(HttpUriRequest request) throws IOException {
        HttpUriRequest usernameContainingRequest = appendUsernameToQueryString(request);
        return httpClient.execute(usernameContainingRequest);
    }

    private HttpUriRequest appendUsernameToQueryString(HttpUriRequest request) {
        HttpRequestWrapper httpRequestWrapper = HttpRequestWrapper.wrap(request);
        URI originalUri = httpRequestWrapper.getURI();
        URI uriWithUsername = appendUsername(originalUri);
        httpRequestWrapper.setURI(uriWithUsername);
        return httpRequestWrapper;
    }

    private URI appendUsername(URI originalUri) {
        URIBuilder uriBuilder = new URIBuilder(originalUri);
        uriBuilder.setParameter("user.name", username);
        try {
            return uriBuilder.build();
        } catch (URISyntaxException e) {
            throw Throwables.propagate(e);
        }
    }
}