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yacy_search_server/source/de/anomic/plasma/plasmaCrawlEURL.java

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// plasmaEURL.java
// -----------------------
// part of YaCy
// (C) by Michael Peter Christen; mc@anomic.de
// first published on http://www.anomic.de
// Frankfurt, Germany, 2004
// last major change: 09.08.2004
//
// $LastChangedDate: 2006-04-02 22:40:07 +0200 (So, 02 Apr 2006) $
// $LastChangedRevision: 1986 $
// $LastChangedBy: orbiter $
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
//
// Using this software in any meaning (reading, learning, copying, compiling,
// running) means that you agree that the Author(s) is (are) not responsible
// for cost, loss of data or any harm that may be caused directly or indirectly
// by usage of this softare or this documentation. The usage of this software
// is on your own risk. The installation and usage (starting/running) of this
// software may allow other people or application to access your computer and
// any attached devices and is highly dependent on the configuration of the
// software which must be done by the user of the software; the author(s) is
// (are) also not responsible for proper configuration and usage of the
// software, even if provoked by documentation provided together with
// the software.
//
// Any changes to this file according to the GPL as documented in the file
// gpl.txt aside this file in the shipment you received can be done to the
// lines that follows this copyright notice here, but changes must not be
// done inside the copyright notive above. A re-distribution must contain
// the intact and unchanged copyright notice.
// Contributions and changes to the program code must be marked as such.
// EURL - noticed (known but not loaded) URL's
package de.anomic.plasma;
import java.io.File;
import java.io.IOException;
import java.util.Date;
import java.util.Iterator;
import java.util.LinkedList;
import de.anomic.plasma.plasmaURL;
import de.anomic.kelondro.kelondroBase64Order;
import de.anomic.kelondro.kelondroBitfield;
import de.anomic.kelondro.kelondroCache;
import de.anomic.kelondro.kelondroFlexTable;
import de.anomic.kelondro.kelondroIndex;
import de.anomic.kelondro.kelondroRow;
import de.anomic.kelondro.kelondroTree;
import de.anomic.net.URL;
import de.anomic.yacy.yacySeedDB;
public class plasmaCrawlEURL {
/* =======================================================================
* Failure reason constants
* ======================================================================= */
// invalid urls
public static final String DENIED_URL_NULL = "denied_(url_null)";
public static final String DENIED_MALFORMED_URL = "denied_(malformed_url)";
public static final String DENIED_UNSUPPORTED_PROTOCOL = "denied_(unsupported_protocol)";
public static final String DENIED_PRIVATE_IP_ADDRESS = "denied_(private_ip_address)";
public static final String DENIED_LOOPBACK_IP_ADDRESS = "denied_(loopback_ip_address)";
public static final String DENIED_CACHEFILE_PATH_TOO_LONG = "denied_(cachefile_path_too_long)";
public static final String DENIED_INVALID_CACHEFILE_PATH = "denied_(invalid_cachefile_path)";
// blacklisted/blocked urls
public static final String DENIED_URL_IN_BLACKLIST = "denied_(url_in_blacklist)";
public static final String DENIED_URL_DOES_NOT_MATCH_FILTER = "denied_(does_not_match_filter)";
public static final String DENIED_CGI_URL = "denied_(cgi_url)";
public static final String DENIED_POST_URL = "denied_(post_url)";
public static final String DENIED_NO_MATCH_WITH_DOMAIN_FILTER = "denied_(no_match_with_domain_filter)";
public static final String DENIED_DOMAIN_COUNT_EXCEEDED = "denied_(domain_count_exceeded)";
public static final String DENIED_ROBOTS_TXT = "denied_(robots.txt)";
// wrong content
public static final String DENIED_WRONG_MIMETYPE_OR_EXT = "denied_(wrong_mimetype_or_extension)";
public static final String DENIED_UNSUPPORTED_CHARSET = "denied_(unsupported_charset)";
public static final String DENIED_REDIRECTION_HEADER_EMPTY = "denied_(redirection_header_empty)";
public static final String DENIED_REDIRECTION_COUNTER_EXCEEDED = "denied_(redirection_counter_exceeded)";
public static final String DENIED_WRONG_HTTP_STATUSCODE = "denied_(wrong_http_status_code_";
public static final String DENIED_CONTENT_DECODING_ERROR = "denied_(content_decoding_error)";
public static final String DENIED_FILESIZE_LIMIT_EXCEEDED = "denied_(filesize_limit_exceeded)";
public static final String DENIED_FILESIZE_UNKNOWN = "denied_(filesize_unknown)";
// network errors
public static final String DENIED_UNKNOWN_HOST = "denied_(unknown_host)";
public static final String DENIED_NO_ROUTE_TO_HOST = "denied_(no_route_to_host)";
public static final String DENIED_NETWORK_IS_UNREACHABLE = "denied_(Network_is_unreachable)";
// connection errors
public static final String DENIED_CONNECTION_ERROR = "denied_(connection_error)";
public static final String DENIED_CONNECTION_BIND_EXCEPTION = "denied_(connection_bind_exception)";
public static final String DENIED_CONNECTION_TIMEOUT = "denied_(connection_timeout)";
public static final String DENIED_CONNECTION_REFUSED = "denied_(connection_refused)";
public static final String DENIED_SSL_UNTRUSTED_CERT = "denied_(No_trusted_ssl_certificate_found)";
// double registered errors
public static final String DOUBLE_REGISTERED = "double_(registered_in_";
// server errors
public static final String DENIED_OUT_OF_DISK_SPACE = "denied_(out_of_disk_space)";
public static final String DENIED_SERVER_SHUTDOWN = "denied_(server_shutdown)";
public static final String DENIED_SERVER_LOGIN_FAILED = "denied_(server_login_failed)";
public static final String DENIED_SERVER_TRASFER_MODE_PROBLEM = "denied_(server_transfermode_problem)";
public static final String DENIED_SERVER_DOWNLOAD_ERROR = "denied_(server_download_error)";
// Parser errors
public static final String DENIED_PARSER_ERROR = "denied_(parser_error)";
public static final String DENIED_DOCUMENT_ENCRYPTED = "denied_(document_encrypted)";
public static final String DENIED_NOT_PARSEABLE_NO_CONTENT = "denied_(not_parseabel_no_content)";
// indexing errors
public static final String DENIED_UNSPECIFIED_INDEXING_ERROR = "denied_(unspecified_indexing_error)";
public static final String DENIED_UNKNOWN_INDEXING_PROCESS_CASE = "denied_(unknown_indexing_process_case)";
/* =======================================================================
* Other object variables
* ======================================================================= */
private LinkedList rejectedStack = new LinkedList(); // strings: url
public final static kelondroRow rowdef = new kelondroRow(
"String urlhash-" + yacySeedDB.commonHashLength + ", " + // the url's hash
"String refhash-" + yacySeedDB.commonHashLength + ", " + // the url's referrer hash
"String initiator-" + yacySeedDB.commonHashLength + ", " + // the crawling initiator
"String executor-" + yacySeedDB.commonHashLength + ", " + // the crawling executor
"String urlstring-256, " + // the url as string
"String urlname-40, " + // the name of the url, from anchor tag <a>name</a>
"Cardinal appdate-4 {b64e}, " + // the time when the url was first time appeared
"Cardinal loaddate-4 {b64e}, " + // the time when the url was last time tried to load
"Cardinal retrycount-2 {b64e}, " + // number of load retries
"String failcause-80, " + // string describing load failure
"byte[] flags-2"); // extra space
// the class object
private kelondroIndex urlIndexFile = null;
public plasmaCrawlEURL(File cachePath, int bufferkb, long preloadTime, boolean newdb) {
super();
if (newdb) {
String newCacheName = "urlErr3.table";
cachePath.mkdirs();
try {
urlIndexFile = new kelondroFlexTable(cachePath, newCacheName, bufferkb * 0x400, preloadTime, rowdef, kelondroBase64Order.enhancedCoder);
} catch (IOException e) {
e.printStackTrace();
System.exit(-1);
}
} else {
File oldCacheFile = new File(cachePath, "urlErr0.db");
oldCacheFile.getParentFile().mkdirs();
urlIndexFile = kelondroTree.open(oldCacheFile, bufferkb * 0x400, preloadTime, rowdef);
}
}
public int size() {
try {
return urlIndexFile.size() ;
} catch (IOException e) {
return 0;
}
}
public void close() throws IOException {
if (urlIndexFile != null) {
urlIndexFile.close();
urlIndexFile = null;
}
}
public int cacheNodeChunkSize() {
if (urlIndexFile instanceof kelondroTree) return ((kelondroTree) urlIndexFile).cacheNodeChunkSize();
if (urlIndexFile instanceof kelondroCache) return ((kelondroCache) urlIndexFile).cacheNodeChunkSize();
if (urlIndexFile instanceof kelondroFlexTable) return ((kelondroFlexTable) urlIndexFile).cacheNodeChunkSize();
return 0;
}
public int[] cacheNodeStatus() {
if (urlIndexFile instanceof kelondroTree) return ((kelondroTree) urlIndexFile).cacheNodeStatus();
if (urlIndexFile instanceof kelondroCache) return ((kelondroCache) urlIndexFile).cacheNodeStatus();
if (urlIndexFile instanceof kelondroFlexTable) return ((kelondroFlexTable) urlIndexFile).cacheNodeStatus();
return new int[]{0,0,0,0,0,0,0,0,0,0};
}
public int cacheObjectChunkSize() {
if (urlIndexFile instanceof kelondroTree) return ((kelondroTree) urlIndexFile).cacheObjectChunkSize();
if (urlIndexFile instanceof kelondroCache) return ((kelondroCache) urlIndexFile).cacheObjectChunkSize();
if (urlIndexFile instanceof kelondroFlexTable) return ((kelondroFlexTable) urlIndexFile).cacheObjectChunkSize();
return 0;
}
public long[] cacheObjectStatus() {
if (urlIndexFile instanceof kelondroTree) return ((kelondroTree) urlIndexFile).cacheObjectStatus();
if (urlIndexFile instanceof kelondroCache) return ((kelondroCache) urlIndexFile).cacheObjectStatus();
if (urlIndexFile instanceof kelondroFlexTable) return ((kelondroFlexTable) urlIndexFile).cacheObjectStatus();
return new long[]{0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
}
public synchronized Entry newEntry(URL url, String referrer, String initiator, String executor,
String name, String failreason, kelondroBitfield flags) {
if ((referrer == null) || (referrer.length() < yacySeedDB.commonHashLength)) referrer = plasmaURL.dummyHash;
if ((initiator == null) || (initiator.length() < yacySeedDB.commonHashLength)) initiator = plasmaURL.dummyHash;
if ((executor == null) || (executor.length() < yacySeedDB.commonHashLength)) executor = plasmaURL.dummyHash;
if (failreason == null) failreason = "unknown";
return new Entry(url, referrer, initiator, executor, name, failreason, flags);
}
public boolean remove(String hash) {
if (hash == null) return false;
try {
urlIndexFile.remove(hash.getBytes());
return true;
} catch (IOException e) {
return false;
}
}
public synchronized void stackPushEntry(Entry e) {
rejectedStack.add(e.hash);
}
public Entry stackPopEntry(int pos) throws IOException {
String urlhash = (String) rejectedStack.get(pos);
if (urlhash == null) return null;
return new Entry(urlhash);
}
public synchronized Entry getEntry(String hash) throws IOException {
return new Entry(hash);
}
public boolean getUseNewDB() {
return (urlIndexFile instanceof kelondroFlexTable);
}
public boolean exists(String urlHash) {
try {
return (urlIndexFile.get(urlHash.getBytes()) != null);
} catch (IOException e) {
return false;
}
}
public void clearStack() {
rejectedStack.clear();
}
public int stackSize() {
return rejectedStack.size();
}
public class Entry {
private String hash; // the url's hash
private String referrer; // the url's referrer hash
private String initiator; // the crawling initiator
private String executor; // the crawling initiator
private URL url; // the url as string
private String name; // the name of the url, from anchor tag <a>name</a>
private Date initdate; // the time when the url was first time appeared
private Date trydate; // the time when the url was last time tried to load
private int trycount; // number of tryings
private String failreason; // string describing reason for load fail
private kelondroBitfield flags; // extra space
private boolean stored;
public Entry(URL url, String referrer, String initiator,
String executor, String name, String failreason, kelondroBitfield flags) {
// create new entry
this.hash = plasmaURL.urlHash(url);
this.referrer = (referrer == null) ? plasmaURL.dummyHash : referrer;
this.initiator = initiator;
this.executor = executor;
this.url = url;
this.name = name;
this.initdate = new Date();
this.trydate = new Date();
this.trycount = 0;
this.failreason = failreason;
this.flags = flags;
this.stored = false;
}
public Entry(String hash) throws IOException {
// generates an plasmaEURLEntry using the url hash
// to speed up the access, the url-hashes are buffered
// in the hash cache.
// we have two options to find the url:
// - look into the hash cache
// - look into the filed properties
// if the url cannot be found, this returns null
this.hash = hash;
kelondroRow.Entry entry = urlIndexFile.get(hash.getBytes());
if (entry != null) {
insertEntry(entry);
}
this.stored = true;
}
public Entry(kelondroRow.Entry entry) throws IOException {
insertEntry(entry);
this.stored = false;
}
private void insertEntry(kelondroRow.Entry entry) throws IOException {
assert (entry != null);
this.hash = entry.getColString(0, null);
this.referrer = entry.getColString(1, "UTF-8");
this.initiator = entry.getColString(2, "UTF-8");
this.executor = entry.getColString(3, "UTF-8");
this.url = new URL(entry.getColString(4, "UTF-8").trim());
String n = entry.getColString(5, "UTF-8");
this.name = (n == null) ? "" : n.trim();
this.initdate = new Date(86400000 * entry.getColLong(6));
this.trydate = new Date(86400000 * entry.getColLong(7));
this.trycount = (int) entry.getColLong(8);
this.failreason = entry.getColString(9, "UTF-8");
this.flags = new kelondroBitfield(entry.getColBytes(10));
return;
}
public void store() {
// stores the values from the object variables into the database
if (this.stored) return;
if (this.hash == null) return;
String initdatestr = kelondroBase64Order.enhancedCoder.encodeLong(initdate.getTime() / 86400000, rowdef.width(6));
String trydatestr = kelondroBase64Order.enhancedCoder.encodeLong(trydate.getTime() / 86400000, rowdef.width(7));
// store the hash in the hash cache
try {
// even if the entry exists, we simply overwrite it
byte[][] entry = new byte[][] {
this.hash.getBytes(),
this.referrer.getBytes(),
this.initiator.getBytes(),
this.executor.getBytes(),
this.url.toString().getBytes(),
this.name.getBytes(),
initdatestr.getBytes(),
trydatestr.getBytes(),
kelondroBase64Order.enhancedCoder.encodeLong(this.trycount, rowdef.width(8)).getBytes(),
this.failreason.getBytes(),
this.flags.bytes()
};
urlIndexFile.put(urlIndexFile.row().newEntry(entry));
this.stored = true;
} catch (IOException e) {
System.out.println("INTERNAL ERROR AT plasmaEURL:url2hash:" + e.toString());
}
}
public String hash() {
// return a url-hash, based on the md5 algorithm
// the result is a String of 12 bytes within a 72-bit space
// (each byte has an 6-bit range)
// that should be enough for all web pages on the world
return this.hash;
}
public String referrer() {
return this.referrer;
}
public URL url() {
return url;
}
public Date initdate() {
return trydate;
}
public Date trydate() {
return trydate;
}
public String initiator() {
// return the creator's hash
return initiator;
}
public String executor() {
// return the creator's hash
return executor;
}
public String name() {
// return the creator's hash
return name;
}
public String failreason() {
return failreason;
}
}
public class kiter implements Iterator {
// enumerates entry elements
Iterator i;
boolean error = false;
public kiter(boolean up, boolean rotating, String firstHash) throws IOException {
i = urlIndexFile.rows(up, rotating, (firstHash == null) ? null : firstHash.getBytes());
error = false;
}
public boolean hasNext() {
if (error) return false;
return i.hasNext();
}
public Object next() throws RuntimeException {
kelondroRow.Entry e = (kelondroRow.Entry) i.next();
if (e == null) return null;
try {
return new Entry(e);
} catch (IOException ex) {
throw new RuntimeException("error '" + ex.getMessage() + "' for hash " + e.getColString(0, null));
}
}
public void remove() {
i.remove();
}
}
public Iterator entries(boolean up, boolean rotating, String firstHash) throws IOException {
// enumerates entry elements
return new kiter(up, rotating, firstHash);
}
}
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