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package eu.dnetlib.data.mdstore.plugins;
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import java.net.URI;
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import java.net.URISyntaxException;
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import java.security.KeyManagementException;
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import java.security.KeyStoreException;
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import java.security.NoSuchAlgorithmException;
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import java.util.concurrent.TimeUnit;
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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.conn.ssl.SSLConnectionSocketFactory;
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import org.apache.http.impl.client.HttpClientBuilder;
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import org.apache.http.ssl.SSLContextBuilder;
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import org.springframework.http.client.HttpComponentsClientHttpRequestFactory;
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import org.springframework.web.client.RestTemplate;
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import eu.dnetlib.data.mdstore.plugins.objects.MdRecord;
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public abstract class GenericDoiMdstorePlugin extends MdRecordPlugin {
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private static final Log log = LogFactory.getLog(GenericDoiMdstorePlugin.class);
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private static final int MAX_NUMBER_OF_ATTEMPTS = 10;
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private static final int INTERVAL_MILLIS = 20000;
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private static final SSLContextBuilder sslContextBuilder = new SSLContextBuilder();
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private static SSLConnectionSocketFactory sslSocketFactory;
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static {
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try {
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sslContextBuilder.loadTrustMaterial(null, (chain, authType) -> true);
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sslSocketFactory = new SSLConnectionSocketFactory(sslContextBuilder.build());
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} catch (final NoSuchAlgorithmException | KeyStoreException | KeyManagementException e) {
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log.error(e);;
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}
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}
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private static final HttpComponentsClientHttpRequestFactory httpRequestFactory = new HttpComponentsClientHttpRequestFactory(HttpClientBuilder
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.create()
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.setConnectionTimeToLive(0, TimeUnit.MILLISECONDS)
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.setMaxConnPerRoute(1)
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.setMaxConnTotal(1)
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.disableAutomaticRetries()
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.disableConnectionState()
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.setSSLSocketFactory(sslSocketFactory)
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.build());
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@Override
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protected final boolean updateRecord(final MdRecord record) {
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for (final String doi : record.getDois()) {
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log.debug(" Record " + record.getId() + " has doi " + doi);
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final String response = download(doi);
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if ((response != null) && updateDocument(record, response)) { return true; }
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}
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return false;
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}
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abstract protected boolean updateDocument(MdRecord doc, String response);
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abstract protected URI prepareURI(String doi) throws URISyntaxException;
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private String download(final String doi) {
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try {
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return fetchUrl(prepareURI(doi), MAX_NUMBER_OF_ATTEMPTS);
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} catch (final URISyntaxException e) {
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log.error("Error resolving doi: " + doi, e);
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return null;
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}
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}
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private static String fetchUrl(final URI url, final int attempts) {
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if (attempts == 0) { throw new RuntimeException("Max number of attempts reached, downloading url: " + url); }
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try {
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return (new RestTemplate(httpRequestFactory)).getForObject(url, String.class);
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} catch (final Exception e) {
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try {
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log.error("Error downloading url: " + url + " - " + e.getMessage());
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Thread.sleep(INTERVAL_MILLIS);
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return fetchUrl(url, attempts - 1);
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} catch (final InterruptedException e1) {
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throw new RuntimeException(e1);
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}
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}
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}
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}
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