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package eu.dnetlib.data.collector.plugins.httpfilename;
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import java.util.ArrayList;
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import java.util.Iterator;
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import java.util.NoSuchElementException;
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import java.util.Objects;
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import java.util.concurrent.ArrayBlockingQueue;
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import java.util.concurrent.TimeUnit;
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import eu.dnetlib.data.collector.rmi.CollectorServiceException;
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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.json.JSONObject;
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import org.json.XML;
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import org.jsoup.Jsoup;
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import org.jsoup.nodes.Document;
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import org.jsoup.nodes.Element;
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import org.jsoup.select.Elements;
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/**
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* Created by miriam on 04/05/2018.
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*/
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public class HTTPWithFileNameCollectorIterable implements Iterable<String> {
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private static final Log log = LogFactory.getLog(HTTPWithFileNameCollectorIterable.class);
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private static final String TERMINATOR = "FINITO";
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private static final String JUNK = "<resource><url>%s</url><DOI>JUNK</DOI></resource>";
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public static final String APP_JSON = "application/json";
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public static final String APP_XML = "application/xml";
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public static final String TEXT_HTML = "text/html";
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private final ArrayBlockingQueue<String> queue = new ArrayBlockingQueue<String>(100);
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private long waitTime = 60L;
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private final ArrayList<String> urls = new ArrayList<>();
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private final ArrayList<String> metas = new ArrayList<String>();
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private String filterParam;
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int total = 0;
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int filtered = 0;
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public HTTPWithFileNameCollectorIterable(String startUrl, String filter){
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if (!startUrl.isEmpty())
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urls.add(startUrl);
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this.filterParam = filter;
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Thread ft = new Thread(new FillMetaQueue());
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ft.start();
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}
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@Override
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public Iterator<String> iterator() {
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return new Iterator<String>(){
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private String last = null;
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private boolean exec_next = true;
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@Override
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public boolean hasNext() {
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if(exec_next){
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try {
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last = queue.poll(waitTime, TimeUnit.SECONDS);
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exec_next = false;
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}catch(InterruptedException e){
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log.warn(String.format("could not find elements to consume for more than %s%s", waitTime, TimeUnit.SECONDS));
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throw new NoSuchElementException(e.getMessage());
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}
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}
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return !(Objects.equals(last, TERMINATOR));
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}
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@Override
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public String next() {
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exec_next = true;
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return last;
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}
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};
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}
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private class FillMetaQueue implements Runnable {
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final Connector c = new Connector();
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public void fillQueue() {
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String url;
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while((metas.size()>0 || urls.size() > 0 )) {
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log.debug("metas.size() = " + metas.size() + " urls.size() = " + urls.size() + " queue.size() = " +queue.size());
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if (metas.size() > 0) {
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url = metas.remove(0);
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try {
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c.get(url);
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} catch (CollectorServiceException e) {
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log.info("Impossible to collect url: " + url + " error: " + e.getMessage());
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}
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if(c.isStatusOk()){
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try {
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String ret = c.getResponse();
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if (ret != null && ret.length()>0) {
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if (!containsFilter(ret))
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queue.offer(addFilePath(ret, url, url.endsWith(".json")), waitTime, TimeUnit.SECONDS);
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else
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filtered++;
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total++;
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}
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} catch (InterruptedException e) {
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log.info("not inserted in queue element associate to url " + url + " error: " + e.getMessage() );
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}
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}
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} else {
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url = urls.remove(0);
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try {
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c.get(url);
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} catch (CollectorServiceException e) {
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log.info("Impossible to collect url: " + url + " error: " + e.getMessage());
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}
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if(c.isStatusOk()) {
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if (c.responseTypeContains(TEXT_HTML)){
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recurFolder(c.getResponse(), url);
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} else if(c.responseTypeContains(APP_JSON) || c.responseTypeContains(APP_XML)){
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try {
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final String element = addFilePath(c.getResponse(), url, c.responseTypeContains(APP_JSON));
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queue.offer(element, waitTime, TimeUnit.SECONDS);
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} catch (InterruptedException e) {
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log.info("not inserted in queue element associate to url " + url + " error: " + e.getMessage() );
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}
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}
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}
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}
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}
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try {
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queue.offer(TERMINATOR, waitTime, TimeUnit.SECONDS);
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} catch (InterruptedException e) {
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throw new IllegalStateException(String.format("could not add element to queue for more than %s%s", waitTime, TimeUnit.SECONDS), e);
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}
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}
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private boolean containsFilter(String meta){
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if (filterParam == null || filterParam.isEmpty())
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return false;
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String[] filter = filterParam.split(";");
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for(String item:filter){
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if (meta.contains(item))
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return true;
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}
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return false;
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}
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private String addFilePath(String meta, String url, boolean isJson){
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String path = url.replace("metadata", "pdf");
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try {
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if(isJson)
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meta = meta.substring(0, meta.length() - 1) + ",'downloadFileUrl':'" + path.substring(0, path.indexOf(".json")) + ".pdf'}";
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else {
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if (meta.contains("<!DOCTYPE")) {
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meta = meta.substring(meta.indexOf("<!DOCTYPE"));
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meta = meta.substring(meta.indexOf(">") + 1);
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}
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int index = meta.lastIndexOf("</");
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meta = meta.substring(0, index) + "<downloadFileUrl>" + path.substring(0, path.indexOf(".xml")) + ".pdf</downloadFileUrl>" + meta.substring(index);
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}
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} catch(Exception ex) {
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log.info("not file with extension .json or .xml");
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}
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if(isJson) {
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try {
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return XML.toString(new JSONObject("{'resource':" + meta + "}"));
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} catch(Exception e) {
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log.fatal("Impossible to transform json object to xml \n" + meta + "\n " + e.getMessage() + "\n" + url);
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// throw new RuntimeException();
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final String junk = String.format(JUNK, url);
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log.warn("returning " + junk);
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return junk;
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}
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}
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return meta;
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}
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private void recurFolder(String text, String url){
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Document doc = Jsoup.parse(text);
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Elements links = doc.select("a");
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for(Element e:links){
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if (!e.text().equals("../")){
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String file = e.attr("href");
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if(file.endsWith(".json") || file.endsWith(".xml"))
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metas.add(url+file);
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else
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urls.add(url+file);
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}
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}
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}
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@Override
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public void run() {
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fillQueue();
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}
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}
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}
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