implemented zenodo dump collector plugin

dhp-workflows/dhp-aggregation/src/main/java/eu/dnetlib/dhp/collection/plugin/zenodo/CollectZenodoDumpCollectorPlugin.java

@@ -0,0 +1,96 @@
+
+package eu.dnetlib.dhp.collection.plugin.zenodo;
+
+import static eu.dnetlib.dhp.utils.DHPUtils.getHadoopConfiguration;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.stream.Stream;
+import java.util.stream.StreamSupport;
+
+import org.apache.commons.io.IOUtils;
+import org.apache.hadoop.fs.FSDataOutputStream;
+import org.apache.hadoop.fs.FileSystem;
+import org.apache.hadoop.fs.Path;
+import org.apache.hadoop.io.compress.CompressionCodec;
+import org.apache.hadoop.io.compress.CompressionCodecFactory;
+import org.apache.http.client.config.RequestConfig;
+import org.apache.http.client.methods.CloseableHttpResponse;
+import org.apache.http.client.methods.HttpGet;
+import org.apache.http.impl.client.CloseableHttpClient;
+import org.apache.http.impl.client.HttpClientBuilder;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import eu.dnetlib.dhp.collection.ApiDescriptor;
+import eu.dnetlib.dhp.collection.plugin.CollectorPlugin;
+import eu.dnetlib.dhp.common.aggregation.AggregatorReport;
+import eu.dnetlib.dhp.common.collection.CollectorException;
+
+public class CollectZenodoDumpCollectorPlugin implements CollectorPlugin {
+
+	final private Logger log = LoggerFactory.getLogger(getClass());
+
+	private void downloadItem(final String name, final String itemURL, final String basePath,
+		final FileSystem fileSystem) {
+		try {
+			final Path hdfsWritePath = new Path(String.format("%s/%s", basePath, name));
+			final FSDataOutputStream fsDataOutputStream = fileSystem.create(hdfsWritePath, true);
+			final HttpGet request = new HttpGet(itemURL);
+			final int timeout = 60; // seconds
+			final RequestConfig config = RequestConfig
+				.custom()
+				.setConnectTimeout(timeout * 1000)
+				.setConnectionRequestTimeout(timeout * 1000)
+				.setSocketTimeout(timeout * 1000)
+				.build();
+			log.info("Downloading url {} into {}", itemURL, hdfsWritePath.getName());
+			try (CloseableHttpClient client = HttpClientBuilder.create().setDefaultRequestConfig(config).build();
+				CloseableHttpResponse response = client.execute(request)) {
+				int responseCode = response.getStatusLine().getStatusCode();
+				log.info("Response code is {}", responseCode);
+				if (responseCode >= 200 && responseCode < 400) {
+					IOUtils.copy(response.getEntity().getContent(), fsDataOutputStream);
+				}
+			} catch (Throwable eu) {
+				throw new RuntimeException(eu);
+			}
+		} catch (Throwable e) {
+			throw new RuntimeException(e);
+		}
+	}
+
+	@Override
+	public Stream<String> collect(ApiDescriptor api, AggregatorReport report) throws CollectorException {
+		try {
+			final String zenodoURL = api.getBaseUrl();
+			final String hdfsURI = api.getParams().get("hdfsURI");
+			final FileSystem fileSystem = FileSystem.get(getHadoopConfiguration(hdfsURI));
+			downloadItem("zenodoDump.tar.gz", zenodoURL, "/tmp", fileSystem);
+			CompressionCodecFactory factory = new CompressionCodecFactory(fileSystem.getConf());
+
+			Path sourcePath = new Path("/tmp/zenodoDump.tar.gz");
+			CompressionCodec codec = factory.getCodec(sourcePath);
+			InputStream gzipInputStream = null;
+			try {
+				gzipInputStream = codec.createInputStream(fileSystem.open(sourcePath));
+				return iterateTar(gzipInputStream);
+
+			} catch (IOException e) {
+				throw new CollectorException(e);
+			} finally {
+				log.info("Closing gzip stream");
+				org.apache.hadoop.io.IOUtils.closeStream(gzipInputStream);
+			}
+		} catch (Exception e) {
+			throw new CollectorException(e);
+		}
+	}
+
+	private Stream<String> iterateTar(InputStream gzipInputStream) throws Exception {
+
+		Iterable<String> iterable = () -> new ZenodoTarIterator(gzipInputStream);
+		return StreamSupport.stream(iterable.spliterator(), false);
+
+	}
+}

dhp-workflows/dhp-aggregation/src/main/java/eu/dnetlib/dhp/collection/plugin/zenodo/ZenodoTarIterator.java

@@ -0,0 +1,59 @@
+
+package eu.dnetlib.dhp.collection.plugin.zenodo;
+
+import java.io.Closeable;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.util.Iterator;
+
+import org.apache.commons.compress.archivers.tar.TarArchiveEntry;
+import org.apache.commons.compress.archivers.tar.TarArchiveInputStream;
+import org.apache.commons.io.IOUtils;
+
+public class ZenodoTarIterator implements Iterator<String>, Closeable {
+
+	private final InputStream gzipInputStream;
+	private final StringBuilder currentItem = new StringBuilder();
+	private TarArchiveInputStream tais;
+	private boolean hasNext;
+
+	public ZenodoTarIterator(InputStream gzipInputStream) {
+		this.gzipInputStream = gzipInputStream;
+		tais = new TarArchiveInputStream(gzipInputStream);
+		hasNext = getNextItem();
+	}
+
+	private boolean getNextItem() {
+		try {
+			TarArchiveEntry entry;
+			while ((entry = tais.getNextTarEntry()) != null) {
+				if (entry.isFile()) {
+					currentItem.setLength(0);
+					currentItem.append(IOUtils.toString(new InputStreamReader(tais)));
+					return true;
+				}
+			}
+			return false;
+		} catch (Throwable e) {
+			throw new RuntimeException(e);
+		}
+	}
+
+	@Override
+	public boolean hasNext() {
+		return hasNext;
+	}
+
+	@Override
+	public String next() {
+		final String data = currentItem.toString();
+		hasNext = getNextItem();
+		return data;
+	}
+
+	@Override
+	public void close() throws IOException {
+		gzipInputStream.close();
+	}
+}

dhp-workflows/dhp-aggregation/src/test/java/eu/dnetlib/dhp/collection/plugin/zenodo/ZenodoPluginCollectionTest.java

@@ -0,0 +1,35 @@
+
+package eu.dnetlib.dhp.collection.plugin.zenodo;
+
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+
+import java.util.zip.GZIPInputStream;
+
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+
+import eu.dnetlib.dhp.collection.ApiDescriptor;
+import eu.dnetlib.dhp.common.collection.CollectorException;
+
+public class ZenodoPluginCollectionTest {
+
+	@Test
+	public void testZenodoIterator() throws Exception {
+
+		final GZIPInputStream gis = new GZIPInputStream(
+			getClass().getResourceAsStream("/eu/dnetlib/dhp/collection/zenodo/zenodo.tar.gz"));
+		try (ZenodoTarIterator it = new ZenodoTarIterator(gis)) {
+			Assertions.assertTrue(it.hasNext());
+			int i = 0;
+			while (it.hasNext()) {
+				Assertions.assertNotNull(it.next());
+				i++;
+			}
+			Assertions.assertEquals(10, i);
+
+		}
+	}
+
+}