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package eu.dnetlib.enabling.resultset.client;
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import java.io.IOException;
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import java.io.InputStream;
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import org.apache.commons.io.IOUtils;
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import org.apache.commons.logging.Log;
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import org.apache.commons.logging.LogFactory;
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import org.apache.http.HttpStatus;
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import org.apache.http.client.methods.CloseableHttpResponse;
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import org.apache.http.client.methods.HttpGet;
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import org.apache.http.impl.client.CloseableHttpClient;
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import org.apache.http.impl.client.HttpClients;
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import org.springframework.beans.factory.annotation.Required;
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import com.google.gson.Gson;
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import eu.dnetlib.enabling.resultset.ResultSetInfo;
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import eu.dnetlib.enabling.resultset.listener.ResultSetListener;
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import eu.dnetlib.enabling.resultset.registry.ResultSetRegistry;
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import eu.dnetlib.rmi.common.ResultSet;
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import eu.dnetlib.rmi.common.ResultSetException;
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public class ResultSetClient {
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private ResultSetRegistry resultSetRegistry;
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private static final Log log = LogFactory.getLog(ResultSetClient.class);
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public <T> Iterable<T> iter(final ResultSet<?> resultSet, final Class<T> clazz) {
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try {
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if (this.resultSetRegistry.contains(resultSet.getId())) {
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final ResultSetListener<?> listener = this.resultSetRegistry.getResultSetById(resultSet.getId());
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return () -> new LocalResultSetClientIterator<>(listener, clazz);
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} else {
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return () -> new HttpResultSetClientIterator<>(resultSet.getId(), resultSet.getBaseUrl(), clazz);
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}
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} catch (final Throwable e) {
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log.error("ITER: Error accessing resultset: " + resultSet.getId());
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throw new RuntimeException(e);
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}
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}
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public ResultSetInfo info(final ResultSet<?> resultSet) {
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try {
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if (this.resultSetRegistry.contains(resultSet.getId())) {
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final ResultSetListener<?> listener = this.resultSetRegistry.getResultSetById(resultSet.getId());
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return new ResultSetInfo(resultSet.getId(), listener);
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} else {
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return invokeRemoteInfo(resultSet);
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}
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} catch (final Throwable e) {
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log.error("INFO: Error accessing resultset: " + resultSet.getId() + " "+e.getMessage());
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throw new RuntimeException(e);
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}
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}
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private ResultSetInfo invokeRemoteInfo(final ResultSet<?> rs) throws ResultSetException {
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final HttpGet method = new HttpGet(rs.getBaseUrl() + "/" + rs.getId() + "/info");
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try(CloseableHttpClient httpClient = HttpClients.createDefault()) {
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try(CloseableHttpResponse response = httpClient.execute(method)) {
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int statusCode = response.getStatusLine().getStatusCode();
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if (HttpStatus.SC_OK != statusCode) {
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throw new ResultSetException("Error " + statusCode + " dowloading url: " + rs.getBaseUrl());
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}
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try(InputStream responseBody = response.getEntity().getContent()) {
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String json = IOUtils.toString(responseBody);
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return new Gson().fromJson(json, ResultSetInfo.class);
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}
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} catch (final Throwable e) {
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throw new ResultSetException("Error downloading url: " + rs.getBaseUrl(), e);
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}
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} catch (IOException e) {
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log.error("Can't close connections gracefully", e);
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throw new ResultSetException("Can't close connections gracefully", e);
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}
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}
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public ResultSetRegistry getResultSetRegistry() {
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return this.resultSetRegistry;
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}
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@Required
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public void setResultSetRegistry(final ResultSetRegistry resultSetRegistry) {
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this.resultSetRegistry = resultSetRegistry;
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}
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}
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