/** Used for redirections or when discovering sitemap URLs * */
private void handleOutlink(Tuple t, URL sURL, String newUrl, Metadata sourceMetadata) {
// build an absolute URL
try {
URL tmpURL = URLUtil.resolveURL(sURL, newUrl);
newUrl = tmpURL.toExternalForm();
} catch (MalformedURLException e) {
LOG.debug("MalformedURLException on {} or {}: {}", sURL.toExternalForm(), newUrl, e);
return;
}
// apply URL filters
if (this.urlFilters != null) {
newUrl = this.urlFilters.filter(sURL, sourceMetadata, newUrl);
}
// filtered
if (newUrl == null) {
return;
}
Metadata metadata =
metadataTransfer.getMetaForOutlink(newUrl, sURL.toExternalForm(), sourceMetadata);
// TODO check that hasn't exceeded max number of redirections
_collector.emit(
com.digitalpebble.storm.crawler.Constants.StatusStreamName,
t,
new Values(newUrl, metadata, Status.DISCOVERED));
}
private List<Outlink> toOutlinks(
String url, Metadata metadata, Map<String, List<String>> slinks) {
List<Outlink> outlinks = new LinkedList<>();
URL sourceUrl;
try {
sourceUrl = new URL(url);
} catch (MalformedURLException e) {
// we would have known by now as previous components check whether
// the URL is valid
LOG.error("MalformedURLException on {}", url);
eventCounter.scope("error_invalid_source_url").incrBy(1);
return outlinks;
}
Map<String, List<String>> linksKept = new HashMap<>();
for (Map.Entry<String, List<String>> linkEntry : slinks.entrySet()) {
String targetURL = linkEntry.getKey();
// filter the urls
if (urlFilters != null) {
targetURL = urlFilters.filter(sourceUrl, metadata, targetURL);
if (targetURL == null) {
eventCounter.scope("outlink_filtered").incr();
continue;
}
}
// the link has survived the various filters
if (targetURL != null) {
List<String> anchors = linkEntry.getValue();
linksKept.put(targetURL, anchors);
eventCounter.scope("outlink_kept").incr();
}
}
for (String outlink : linksKept.keySet()) {
// configure which metadata gets inherited from parent
Metadata linkMetadata = metadataTransfer.getMetaForOutlink(outlink, url, metadata);
Outlink ol = new Outlink(outlink);
// add the anchors to the metadata?
if (trackAnchors) {
List<String> anchors = linksKept.get(outlink);
if (anchors.size() > 0) {
linkMetadata.addValues(ANCHORS_KEY_NAME, anchors);
// sets the first anchor
ol.setAnchor(anchors.get(0));
}
}
ol.setMetadata(linkMetadata);
outlinks.add(ol);
}
return outlinks;
}
@SuppressWarnings({"rawtypes", "unchecked"})
@Override
public void prepare(Map conf, TopologyContext context, OutputCollector collector) {
this.collector = collector;
eventCounter =
context.registerMetric(this.getClass().getSimpleName(), new MultiCountMetric(), 10);
parseFilters = ParseFilters.emptyParseFilter;
String parseconfigfile =
ConfUtils.getString(conf, "parsefilters.config.file", "parsefilters.json");
if (parseconfigfile != null) {
try {
parseFilters = new ParseFilters(conf, parseconfigfile);
} catch (IOException e) {
LOG.error("Exception caught while loading the ParseFilters");
throw new RuntimeException("Exception caught while loading the ParseFilters", e);
}
}
urlFilters = URLFilters.emptyURLFilters;
emitOutlinks = ConfUtils.getBoolean(conf, "parser.emitOutlinks", true);
if (emitOutlinks) {
String urlconfigfile = ConfUtils.getString(conf, "urlfilters.config.file", "urlfilters.json");
if (urlconfigfile != null) {
try {
urlFilters = new URLFilters(conf, urlconfigfile);
} catch (IOException e) {
LOG.error("Exception caught while loading the URLFilters");
throw new RuntimeException("Exception caught while loading the URLFilters", e);
}
}
}
trackAnchors = ConfUtils.getBoolean(conf, "track.anchors", true);
robots_noFollow_strict = ConfUtils.getBoolean(conf, RobotsTags.ROBOTS_NO_FOLLOW_STRICT, true);
metadataTransfer = MetadataTransfer.getInstance(conf);
}
@SuppressWarnings({"rawtypes", "unchecked"})
@Override
public void prepare(Map stormConf, TopologyContext context, OutputCollector collector) {
_collector = collector;
this.conf = new Config();
this.conf.putAll(stormConf);
checkConfiguration();
this.taskIndex = context.getThisTaskIndex();
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss", Locale.ENGLISH);
long start = System.currentTimeMillis();
LOG.info("[Fetcher #{}] : starting at {}", taskIndex, sdf.format(start));
// Register a "MultiCountMetric" to count different events in this bolt
// Storm will emit the counts every n seconds to a special bolt via a
// system stream
// The data can be accessed by registering a "MetricConsumer" in the
// topology
this.eventCounter = context.registerMetric("fetcher_counter", new MultiCountMetric(), 10);
this.averagedMetrics =
context.registerMetric("fetcher_average", new MultiReducedMetric(new MeanReducer()), 10);
this.perSecMetrics =
context.registerMetric(
"fetcher_average_persec", new MultiReducedMetric(new PerSecondReducer()), 10);
protocolFactory = new ProtocolFactory(conf);
String urlconfigfile = ConfUtils.getString(conf, "urlfilters.config.file", "urlfilters.json");
if (urlconfigfile != null)
try {
urlFilters = new URLFilters(conf, urlconfigfile);
} catch (IOException e) {
LOG.error("Exception caught while loading the URLFilters");
throw new RuntimeException("Exception caught while loading the URLFilters", e);
}
metadataTransfer = MetadataTransfer.getInstance(stormConf);
allowRedirs =
ConfUtils.getBoolean(
stormConf, com.digitalpebble.storm.crawler.Constants.AllowRedirParamName, true);
sitemapsAutoDiscovery = ConfUtils.getBoolean(stormConf, "sitemap.discovery", false);
queueMode = ConfUtils.getString(conf, "fetcher.queue.mode", QUEUE_MODE_HOST);
// check that the mode is known
if (!queueMode.equals(QUEUE_MODE_IP)
&& !queueMode.equals(QUEUE_MODE_DOMAIN)
&& !queueMode.equals(QUEUE_MODE_HOST)) {
LOG.error("Unknown partition mode : {} - forcing to byHost", queueMode);
queueMode = QUEUE_MODE_HOST;
}
LOG.info("Using queue mode : {}", queueMode);
this.crawlDelay = (long) (ConfUtils.getFloat(conf, "fetcher.server.delay", 1.0f) * 1000);
this.maxCrawlDelay = (long) ConfUtils.getInt(conf, "fetcher.max.crawl.delay", 30) * 1000;
}
