/
CrawlConfig.java
766 lines (642 loc) · 22.7 KB
/
CrawlConfig.java
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package edu.uci.ics.crawler4j.crawler;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashSet;
import java.util.List;
import org.apache.http.Header;
import org.apache.http.client.CookieStore;
import org.apache.http.client.config.CookieSpecs;
import org.apache.http.conn.DnsResolver;
import org.apache.http.impl.conn.SystemDefaultDnsResolver;
import org.apache.http.message.BasicHeader;
import edu.uci.ics.crawler4j.crawler.authentication.AuthInfo;
public class CrawlConfig {
/**
* The folder which will be used by crawler for storing the intermediate
* crawl data. The content of this folder should not be modified manually.
*/
private String crawlStorageFolder;
/**
* If this feature is enabled, you would be able to resume a previously
* stopped/crashed crawl. However, it makes crawling slightly slower
*/
private boolean resumableCrawling = false;
/**
* The lock timeout for the underlying sleepycat DB, in milliseconds
*/
private long dbLockTimeout = 500;
/**
* Maximum depth of crawling For unlimited depth this parameter should be
* set to -1
*/
private int maxDepthOfCrawling = -1;
/**
* Maximum number of pages to fetch For unlimited number of pages, this
* parameter should be set to -1
*/
private int maxPagesToFetch = -1;
/**
* user-agent string that is used for representing your crawler to web
* servers. See http://en.wikipedia.org/wiki/User_agent for more details
*/
private String userAgentString = "crawler4j (https://github.com/yasserg/crawler4j/)";
/**
* Default request header values.
*/
private Collection<BasicHeader> defaultHeaders = new HashSet<BasicHeader>();
/**
* Politeness delay in milliseconds (delay between sending two requests to
* the same host).
*/
private int politenessDelay = 200;
/**
* Should we also crawl https pages?
*/
private boolean includeHttpsPages = true;
/**
* Should we fetch binary content such as images, audio, ...?
*/
private boolean includeBinaryContentInCrawling = false;
/**
* Should we process binary content such as image, audio, ... using TIKA?
*/
private boolean processBinaryContentInCrawling = false;
/**
* Maximum Connections per host
*/
private int maxConnectionsPerHost = 100;
/**
* Maximum total connections
*/
private int maxTotalConnections = 100;
/**
* Socket timeout in milliseconds
*/
private int socketTimeout = 20000;
/**
* Connection timeout in milliseconds
*/
private int connectionTimeout = 30000;
/**
* Max number of outgoing links which are processed from a page
*/
private int maxOutgoingLinksToFollow = 5000;
/**
* Max allowed size of a page. Pages larger than this size will not be
* fetched.
*/
private int maxDownloadSize = 1048576;
/**
* Should we follow redirects?
*/
private boolean followRedirects = true;
/**
* Should the TLD list be updated automatically on each run? Alternatively,
* it can be loaded from the embedded tld-names.zip file that was obtained from
* https://publicsuffix.org/list/public_suffix_list.dat
*/
private boolean onlineTldListUpdate = false;
private String publicSuffixSourceUrl = "https://publicsuffix.org/list/public_suffix_list.dat";
private String publicSuffixLocalFile = null;
/**
* Should the crawler stop running when the queue is empty?
*/
private boolean shutdownOnEmptyQueue = true;
/**
* Wait this long before checking the status of the worker threads.
*/
private int threadMonitoringDelaySeconds = 10;
/**
* Wait this long to verify the craweler threads are finished working.
*/
private int threadShutdownDelaySeconds = 10;
/**
* Wait this long in seconds before launching cleanup.
*/
private int cleanupDelaySeconds = 10;
/**
* If crawler should run behind a proxy, this parameter can be used for
* specifying the proxy host.
*/
private String proxyHost = null;
/**
* If crawler should run behind a proxy, this parameter can be used for
* specifying the proxy port.
*/
private int proxyPort = 80;
/**
* If crawler should run behind a proxy and user/pass is needed for
* authentication in proxy, this parameter can be used for specifying the
* username.
*/
private String proxyUsername = null;
/**
* If crawler should run behind a proxy and user/pass is needed for
* authentication in proxy, this parameter can be used for specifying the
* password.
*/
private String proxyPassword = null;
/**
* List of possible authentications needed by crawler
*/
private List<AuthInfo> authInfos;
/**
* Cookie policy
*/
private String cookiePolicy = CookieSpecs.STANDARD;
/**
* Whether to honor "nofollow" flag
*/
private boolean respectNoFollow = true;
/**
* Whether to honor "noindex" flag
*/
private boolean respectNoIndex = true;
/**
* The {@link CookieStore} to use to store and retrieve cookies <br />
* useful for passing initial cookies to the crawler.
*/
private CookieStore cookieStore;
/**
* DNS resolver to use, {@link SystemDefaultDnsResolver} is default.
*/
public void setDnsResolver(final DnsResolver dnsResolver) {
this.dnsResolver = dnsResolver;
}
public DnsResolver getDnsResolver() {
return dnsResolver;
}
private DnsResolver dnsResolver = new SystemDefaultDnsResolver();
private boolean haltOnError = false;
private boolean allowSingleLevelDomain = false;
/*
* number of pages to fetch/process from the database in a single read
*/
private int batchReadSize = 50;
/**
* Validates the configs specified by this instance.
*
* @throws Exception on Validation fail
*/
public void validate() throws Exception {
if (crawlStorageFolder == null) {
throw new Exception("Crawl storage folder is not set in the CrawlConfig.");
}
if (politenessDelay < 0) {
throw new Exception("Invalid value for politeness delay: " + politenessDelay);
}
if (maxDepthOfCrawling < -1) {
throw new Exception(
"Maximum crawl depth should be either a positive number or -1 for unlimited depth" +
".");
}
if (maxDepthOfCrawling > Short.MAX_VALUE) {
throw new Exception("Maximum value for crawl depth is " + Short.MAX_VALUE);
}
}
public String getCrawlStorageFolder() {
return crawlStorageFolder;
}
/**
* Sets the folder which will be used by crawler for storing the
* intermediate crawl data (e.g. list of urls that are extracted
* from previously fetched pages and need to be crawled later).
* Content of this folder should not be modified manually.
*/
public void setCrawlStorageFolder(String crawlStorageFolder) {
this.crawlStorageFolder = crawlStorageFolder;
}
public boolean isResumableCrawling() {
return resumableCrawling;
}
/**
* If this feature is enabled, you would be able to resume a previously
* stopped/crashed crawl. However, it makes crawling slightly slower
*
* @param resumableCrawling Should crawling be resumable between runs ?
*/
public void setResumableCrawling(boolean resumableCrawling) {
this.resumableCrawling = resumableCrawling;
}
/**
* Set the lock timeout for the underlying sleepycat DB, in milliseconds. Default is 500.
*
* @see com.sleepycat.je.EnvironmentConfig#setLockTimeout(long, java.util.concurrent.TimeUnit)
* @param dbLockTimeout
*/
public void setDbLockTimeout(long dbLockTimeout) {
this.dbLockTimeout = dbLockTimeout;
}
public long getDbLockTimeout() {
return this.dbLockTimeout;
}
public int getMaxDepthOfCrawling() {
return maxDepthOfCrawling;
}
/**
* Maximum depth of crawling For unlimited depth this parameter should be set to -1
*
* @param maxDepthOfCrawling Depth of crawling (all links on current page = depth of 1)
*/
public void setMaxDepthOfCrawling(int maxDepthOfCrawling) {
this.maxDepthOfCrawling = maxDepthOfCrawling;
}
public int getMaxPagesToFetch() {
return maxPagesToFetch;
}
/**
* Maximum number of pages to fetch For unlimited number of pages, this parameter should be
* set to -1
*
* @param maxPagesToFetch How many pages to fetch from all threads together ?
*/
public void setMaxPagesToFetch(int maxPagesToFetch) {
this.maxPagesToFetch = maxPagesToFetch;
}
/**
*
* @return userAgentString
*/
public String getUserAgentString() {
return userAgentString;
}
/**
* user-agent string that is used for representing your crawler to web
* servers. See http://en.wikipedia.org/wiki/User_agent for more details
*
* @param userAgentString Custom userAgent string to use as your crawler's identifier
*/
public void setUserAgentString(String userAgentString) {
this.userAgentString = userAgentString;
}
/**
* Return a copy of the default header collection.
*/
public Collection<BasicHeader> getDefaultHeaders() {
return new HashSet<>(defaultHeaders);
}
/**
* Set the default header collection (creating copies of the provided headers).
*/
public void setDefaultHeaders(Collection<? extends Header> defaultHeaders) {
Collection<BasicHeader> copiedHeaders = new HashSet<>();
for (Header header : defaultHeaders) {
copiedHeaders.add(new BasicHeader(header.getName(), header.getValue()));
}
this.defaultHeaders = copiedHeaders;
}
public int getPolitenessDelay() {
return politenessDelay;
}
/**
* Politeness delay in milliseconds (delay between sending two requests to
* the same host).
*
* @param politenessDelay
* the delay in milliseconds.
*/
public void setPolitenessDelay(int politenessDelay) {
this.politenessDelay = politenessDelay;
}
public boolean isIncludeHttpsPages() {
return includeHttpsPages;
}
/**
* @param includeHttpsPages Should we crawl https pages?
*/
public void setIncludeHttpsPages(boolean includeHttpsPages) {
this.includeHttpsPages = includeHttpsPages;
}
public boolean isIncludeBinaryContentInCrawling() {
return includeBinaryContentInCrawling;
}
/**
*
* @param includeBinaryContentInCrawling Should we fetch binary content such as images,
* audio, ...?
*/
public void setIncludeBinaryContentInCrawling(boolean includeBinaryContentInCrawling) {
this.includeBinaryContentInCrawling = includeBinaryContentInCrawling;
}
public boolean isProcessBinaryContentInCrawling() {
return processBinaryContentInCrawling;
}
/**
* Should we process binary content such as images, audio, ... using TIKA?
*/
public void setProcessBinaryContentInCrawling(boolean processBinaryContentInCrawling) {
this.processBinaryContentInCrawling = processBinaryContentInCrawling;
}
public int getMaxConnectionsPerHost() {
return maxConnectionsPerHost;
}
/**
* @param maxConnectionsPerHost Maximum Connections per host
*/
public void setMaxConnectionsPerHost(int maxConnectionsPerHost) {
this.maxConnectionsPerHost = maxConnectionsPerHost;
}
public int getMaxTotalConnections() {
return maxTotalConnections;
}
/**
* @param maxTotalConnections Maximum total connections
*/
public void setMaxTotalConnections(int maxTotalConnections) {
this.maxTotalConnections = maxTotalConnections;
}
public int getSocketTimeout() {
return socketTimeout;
}
/**
* @param socketTimeout Socket timeout in milliseconds
*/
public void setSocketTimeout(int socketTimeout) {
this.socketTimeout = socketTimeout;
}
public int getConnectionTimeout() {
return connectionTimeout;
}
/**
* @param connectionTimeout Connection timeout in milliseconds
*/
public void setConnectionTimeout(int connectionTimeout) {
this.connectionTimeout = connectionTimeout;
}
public int getMaxOutgoingLinksToFollow() {
return maxOutgoingLinksToFollow;
}
/**
* @param maxOutgoingLinksToFollow Max number of outgoing links which are processed from a page
*/
public void setMaxOutgoingLinksToFollow(int maxOutgoingLinksToFollow) {
this.maxOutgoingLinksToFollow = maxOutgoingLinksToFollow;
}
public int getMaxDownloadSize() {
return maxDownloadSize;
}
/**
* @param maxDownloadSize Max allowed size of a page. Pages larger than this size will not be
* fetched.
*/
public void setMaxDownloadSize(int maxDownloadSize) {
this.maxDownloadSize = maxDownloadSize;
}
public boolean isFollowRedirects() {
return followRedirects;
}
/**
* @param followRedirects Should we follow redirects?
*/
public void setFollowRedirects(boolean followRedirects) {
this.followRedirects = followRedirects;
}
public boolean isShutdownOnEmptyQueue() {
return shutdownOnEmptyQueue;
}
/**
* Should the crawler stop running when the queue is empty?
*/
public void setShutdownOnEmptyQueue(boolean shutdown) {
shutdownOnEmptyQueue = shutdown;
}
public boolean isOnlineTldListUpdate() {
return onlineTldListUpdate;
}
/**
* Should the TLD list be updated automatically on each run? Alternatively,
* it can be loaded from the embedded tld-names.txt resource file that was
* obtained from https://publicsuffix.org/list/public_suffix_list.dat
*/
public void setOnlineTldListUpdate(boolean online) {
onlineTldListUpdate = online;
}
public String getPublicSuffixSourceUrl() {
return publicSuffixSourceUrl;
}
/**
* URL from which the public suffix list is obtained. By default
* this is https://publicsuffix.org/list/public_suffix_list.dat
*/
public void setPublicSuffixSourceUrl(String publicSuffixSourceUrl) {
this.publicSuffixSourceUrl = publicSuffixSourceUrl;
}
public String getPublicSuffixLocalFile() {
return publicSuffixLocalFile;
}
/**
* Only used if {@link #setOnlineTldListUpdate(boolean)} is {@code true}. If
* this property is not null then it overrides
* {@link #setPublicSuffixSourceUrl(String)}
*
* @param publicSuffixLocalFile local filename of public suffix list
*/
public void setPublicSuffixLocalFile(String publicSuffixLocalFile) {
this.publicSuffixLocalFile = publicSuffixLocalFile;
}
public String getProxyHost() {
return proxyHost;
}
/**
* @param proxyHost If crawler should run behind a proxy, this parameter can be used for
* specifying the proxy host.
*/
public void setProxyHost(String proxyHost) {
this.proxyHost = proxyHost;
}
public int getProxyPort() {
return proxyPort;
}
/**
* @param proxyPort If crawler should run behind a proxy, this parameter can be used for
* specifying the proxy port.
*/
public void setProxyPort(int proxyPort) {
this.proxyPort = proxyPort;
}
public String getProxyUsername() {
return proxyUsername;
}
/**
* @param proxyUsername
* If crawler should run behind a proxy and user/pass is needed for
* authentication in proxy, this parameter can be used for specifying the username.
*/
public void setProxyUsername(String proxyUsername) {
this.proxyUsername = proxyUsername;
}
public String getProxyPassword() {
return proxyPassword;
}
/**
* If crawler should run behind a proxy and user/pass is needed for
* authentication in proxy, this parameter can be used for specifying the password.
*
* @param proxyPassword String Password
*/
public void setProxyPassword(String proxyPassword) {
this.proxyPassword = proxyPassword;
}
/**
* @return the authentications Information
*/
public List<AuthInfo> getAuthInfos() {
return authInfos;
}
public void addAuthInfo(AuthInfo authInfo) {
if (this.authInfos == null) {
this.authInfos = new ArrayList<AuthInfo>();
}
this.authInfos.add(authInfo);
}
/**
* @param authInfos authenticationInformations to set
*/
public void setAuthInfos(List<AuthInfo> authInfos) {
this.authInfos = authInfos;
}
public int getThreadMonitoringDelaySeconds() {
return threadMonitoringDelaySeconds;
}
public void setThreadMonitoringDelaySeconds(int delay) {
this.threadMonitoringDelaySeconds = delay;
}
public int getThreadShutdownDelaySeconds() {
return threadShutdownDelaySeconds;
}
public void setThreadShutdownDelaySeconds(int delay) {
this.threadShutdownDelaySeconds = delay;
}
public int getCleanupDelaySeconds() {
return cleanupDelaySeconds;
}
public void setCleanupDelaySeconds(int delay) {
this.cleanupDelaySeconds = delay;
}
public String getCookiePolicy() {
return cookiePolicy;
}
public void setCookiePolicy(String cookiePolicy) {
this.cookiePolicy = cookiePolicy;
}
/**
* Gets the configured {@link CookieStore} or null if none is set
* @return the {@link CookieStore}
*/
public CookieStore getCookieStore() {
return cookieStore;
}
/**
* Sets the {@link CookieStore to be used}
* @param cookieStore the {@link CookieStore}
*/
public void setCookieStore(CookieStore cookieStore) {
this.cookieStore = cookieStore;
}
/**
* Gets the current {@link CookieStore} used
* @return the {@link CookieStore}
*/
public boolean isRespectNoFollow() {
return respectNoFollow;
}
public void setRespectNoFollow(boolean respectNoFollow) {
this.respectNoFollow = respectNoFollow;
}
public boolean isRespectNoIndex() {
return respectNoIndex;
}
public void setRespectNoIndex(boolean respectNoIndex) {
this.respectNoIndex = respectNoIndex;
}
/**
* Indicates if all crawling will stop if an unexpected error occurs.
*/
public boolean isHaltOnError() {
return haltOnError;
}
/**
* Should all crawling stop if an unexpected error occurs? Default is
* {@code false}.
*
* @param haltOnError
* {@code true} if all crawling should be halted
*/
public void setHaltOnError(boolean haltOnError) {
this.haltOnError = haltOnError;
}
/**
* Are single level domains (e.g. http://localhost) considered valid?
*/
public boolean isAllowSingleLevelDomain() {
return allowSingleLevelDomain;
}
/**
* Allow single level domains (e.g. http://localhost). This is very useful for
* testing especially when you may be using localhost.
*
* @param allowSingleLevelDomain
* {@code true} if single level domain should be considered valid
*/
public void setAllowSingleLevelDomain(boolean allowSingleLevelDomain) {
this.allowSingleLevelDomain = allowSingleLevelDomain;
}
/**
* Number of pages to fetch/process from the database in a single read transaction.
*
* @return the batch read size
*/
public int getBatchReadSize() {
return batchReadSize;
}
public void setBatchReadSize(int batchReadSize) {
this.batchReadSize = batchReadSize;
}
@Override
public String toString() {
StringBuilder sb = new StringBuilder();
sb.append("Crawl storage folder: " + getCrawlStorageFolder() + "\n");
sb.append("Resumable crawling: " + isResumableCrawling() + "\n");
sb.append("Max depth of crawl: " + getMaxDepthOfCrawling() + "\n");
sb.append("Max pages to fetch: " + getMaxPagesToFetch() + "\n");
sb.append("User agent string: " + getUserAgentString() + "\n");
sb.append("Include https pages: " + isIncludeHttpsPages() + "\n");
sb.append("Include binary content: " + isIncludeBinaryContentInCrawling() + "\n");
sb.append("Max connections per host: " + getMaxConnectionsPerHost() + "\n");
sb.append("Max total connections: " + getMaxTotalConnections() + "\n");
sb.append("Socket timeout: " + getSocketTimeout() + "\n");
sb.append("Max total connections: " + getMaxTotalConnections() + "\n");
sb.append("Max outgoing links to follow: " + getMaxOutgoingLinksToFollow() + "\n");
sb.append("Max download size: " + getMaxDownloadSize() + "\n");
sb.append("Should follow redirects?: " + isFollowRedirects() + "\n");
sb.append("Proxy host: " + getProxyHost() + "\n");
sb.append("Proxy port: " + getProxyPort() + "\n");
sb.append("Proxy username: " + getProxyUsername() + "\n");
sb.append("Thread monitoring delay: " + getThreadMonitoringDelaySeconds() + "\n");
sb.append("Thread shutdown delay: " + getThreadShutdownDelaySeconds() + "\n");
sb.append("Cleanup delay: " + getCleanupDelaySeconds() + "\n");
sb.append("Cookie policy: " + getCookiePolicy() + "\n");
sb.append("Respect nofollow: " + isRespectNoFollow() + "\n");
sb.append("Respect noindex: " + isRespectNoIndex() + "\n");
sb.append("Halt on error: " + isHaltOnError() + "\n");
sb.append("Allow single level domain:" + isAllowSingleLevelDomain() + "\n");
sb.append("Batch read size: " + getBatchReadSize() + "\n");
return sb.toString();
}
}