(River Web does not sync up with the latest elasticsearch. Fess is Enterprise Search Server and contains the same features as River Web. See Fess)
Elasticsearch River Web
Overview
Elasticsearch River Web is a web crawler application for Elasticsearch. This application provides a feature to crawl web sites and extract the content by CSS Query. (As of version 1.5, River Web is not Elasticsearch plugin)
If you want to use Full Text Search Server, please see Fess.
Version
| River Web | Tested on ES | Download |
|---|---|---|
| master | 2.4.X | Snapshot |
| 2.4.0 | 2.4.0 | Download |
| 2.0.2 | 2.3.1 | Download |
| 2.0.1 | 2.2.0 | Download |
| 2.0.0 | 2.1.2 | Download |
For old version, see README_ver1.md or README_ver1.5.md.
Issues/Questions
Please file an issue. (Japanese forum is here.)
Installation
Install River Web
Zip File
$ unzip elasticsearch-river-web-[VERSION].zip
Tar.GZ File
$ tar zxvf elasticsearch-river-web-[VERSION].tar.gz
Usage
Create Index To Store Crawl Data
An index for storing crawl data is needed before starting River Web. For example, to store data to "webindex/my_web", create it as below:
$ curl -XPUT 'localhost:9200/webindex' -d '
{
"settings":{
"index":{
"refresh_interval":"1s",
"number_of_shards":"10",
"number_of_replicas" : "0"
}
},
"mappings":{
"my_web":{
"properties":{
"url":{
"type":"string",
"index":"not_analyzed"
},
"method":{
"type":"string",
"index":"not_analyzed"
},
"charSet":{
"type":"string",
"index":"not_analyzed"
},
"mimeType":{
"type":"string",
"index":"not_analyzed"
}
}
}
}
}'
Feel free to add any properties other than the above if you need them.
Register Crawl Config Data
A crawling configuration is created by registering a document to .river_web index as below. This example crawls sites of http://www.codelibs.org/ and http://fess.codelibs.org/.
$ curl -XPUT 'localhost:9200/.river_web/config/my_web' -d '{
"index" : "webindex",
"type" : "my_web",
"urls" : ["http://www.codelibs.org/", "http://fess.codelibs.org/"],
"include_urls" : ["http://www.codelibs.org/.*", "http://fess.codelibs.org/.*"],
"max_depth" : 3,
"max_access_count" : 100,
"num_of_thread" : 5,
"interval" : 1000,
"target" : [
{
"pattern" : {
"url" : "http://www.codelibs.org/.*",
"mimeType" : "text/html"
},
"properties" : {
"title" : {
"text" : "title"
},
"body" : {
"text" : "body"
},
"bodyAsHtml" : {
"html" : "body"
},
"projects" : {
"text" : "ul.nav-list li a",
"isArray" : true
}
}
},
{
"pattern" : {
"url" : "http://fess.codelibs.org/.*",
"mimeType" : "text/html"
},
"properties" : {
"title" : {
"text" : "title"
},
"body" : {
"text" : "body",
"trimSpaces" : true
},
"menus" : {
"text" : "ul.nav-list li a",
"isArray" : true
}
}
}
]
}'
The configuration is:
| Property | Type | Description |
|---|---|---|
| index | string | Stored index name. |
| type | string | Stored type name. |
| urls | array | Start point of URL for crawling. |
| include_urls | array | White list of URL for crawling. |
| exclude_urls | array | Black list of URL for crawling. |
| max_depth | int | Depth of crawling documents. |
| max_access_count | int | The number of crawling documents. |
| num_of_thread | int | The number of crawler threads. |
| interval | int | Interval time (ms) to crawl documents. |
| incremental | boolean | Incremental crawling. |
| overwrite | boolean | Delete documents of old duplicated url. |
| user_agent | string | User-agent name when crawling. |
| robots_txt | boolean | If you want to ignore robots.txt, false. |
| authentications | object | Specify BASIC/DIGEST/NTLM authentication info. |
| target.urlPattern | string | URL pattern to extract contents by CSS Query. |
| target.properties.name | string | "name" is used as a property name in the index. |
| target.properties.name.text | string | CSS Query for the property value. |
| target.properties.name.html | string | CSS Query for the property value. |
| target.properties.name.script | string | Rewrite the property value by Script(Groovy). |
Start Crawler
./bin/riverweb --config-id [config doc id] --cluster-name [Elasticsearch Cluster Name] --cleanup
For example,
./bin/riverweb --config-id my_web --cluster-name elasticsearch --cleanup
Unregister Crawl Config Data
If you want to stop the crawler, kill the crawler process and then delete the config document as below:
$ curl -XDELETE 'localhost:9200/.river_web/config/my_web'
Examples
Full Text Search for Your site (ex. http://fess.codelibs.org/)
$ curl -XPUT 'localhost:9200/.river_web/fess/fess_site' -d '{
"index" : "webindex",
"type" : "fess_site",
"urls" : ["http://fess.codelibs.org/"],
"include_urls" : ["http://fess.codelibs.org/.*"],
"max_depth" : 3,
"max_access_count" : 1000,
"num_of_thread" : 5,
"interval" : 1000,
"target" : [
{
"pattern" : {
"url" : "http://fess.codelibs.org/.*",
"mimeType" : "text/html"
},
"properties" : {
"title" : {
"text" : "title"
},
"body" : {
"text" : "body",
"trimSpaces" : true
}
}
}
]
}'
Aggregate a title/content from news.yahoo.com
$ curl -XPUT 'localhost:9200/.river_web/config/yahoo_site' -d '{
"index" : "webindex",
"type" : "my_web",
"urls" : ["http://news.yahoo.com/"],
"include_urls" : ["http://news.yahoo.com/.*"],
"max_depth" : 1,
"max_access_count" : 10,
"num_of_thread" : 3,
"interval" : 3000,
"user_agent" : "Mozilla/5.0 (Windows NT 6.3; Trident/7.0; rv:11.0) like Gecko",
"target" : [
{
"pattern" : {
"url" : "http://news.yahoo.com/video/.*html",
"mimeType" : "text/html"
},
"properties" : {
"title" : {
"text" : "title"
}
}
},
{
"pattern" : {
"url" : "http://news.yahoo.com/.*html",
"mimeType" : "text/html"
},
"properties" : {
"title" : {
"text" : "h1.headline"
},
"content" : {
"text" : "section#mediacontentstory p"
}
}
}
]
}'
(if news.yahoo.com is updated, the above example needs to be updated.)
Others
BASIC/DIGEST/NTLM authentication
River Web supports BASIC/DIGEST/NTLM authentication. Set authentications object.
...
"num_of_thread" : 5,
"interval" : 1000,
"authentications":[
{
"scope": {
"scheme":"BASIC"
},
"credentials": {
"username":"testuser",
"password":"secret"
}
}],
"target" : [
...
The configuration is:
| Property | Type | Description |
|---|---|---|
| authentications.scope.scheme | string | BASIC, DIGEST or NTLM |
| authentications.scope.host | string | (Optional)Target hostname. |
| authentications.scope.port | int | (Optional)Port number. |
| authentications.scope.realm | string | (Optional)Realm name. |
| authentications.credentials.username | string | Username. |
| authentications.credentials.password | string | Password. |
| authentications.credentials.workstation | string | (Optional)Workstation for NTLM. |
| authentications.credentials.domain | string | (Optional)Domain for NTLM. |
For example, if you want to use an user in ActiveDirectory, the configuration is below:
"authentications":[
{
"scope": {
"scheme":"NTLM"
},
"credentials": {
"domain":"your.ad.domain",
"username":"taro",
"password":"himitsu"
}
}],
Use attachment type
River Web supports attachment type. For example, create a mapping with attachment type:
curl -XPUT "localhost:9200/web/test/_mapping?pretty" -d '{
"test" : {
"properties" : {
...
"my_attachment" : {
"type" : "attachment",
"fields" : {
"file" : { "index" : "no" },
"title" : { "store" : "yes" },
"date" : { "store" : "yes" },
"author" : { "store" : "yes" },
"keywords" : { "store" : "yes" },
"content_type" : { "store" : "yes" },
"content_length" : { "store" : "yes" }
}
}
...
and then start your river. In "properties" object, when a value of "type" is "attachment", the crawled url is stored as base64-encoded data.
curl -XPUT localhost:9200/.river_web/config/2 -d '{
"index" : "web",
"type" : "data",
"urls" : "http://...",
...
"target" : [
...
{
"settings" : {
"html" : false
},
"pattern" : {
"url" : "http://.../.*"
},
"properties" : {
"my_attachment" : {
"type" : "attachment"
}
}
}
]
...
Use Multibyte Characters
An example in Japanese environment is below. First, put some configuration file into conf directory of Elasticsearch.
$ cd $ES_HOME/conf # ex. /etc/elasticsearch if using rpm package
$ sudo wget https://raw.github.com/codelibs/fess-server/master/src/tomcat/solr/core1/conf/mapping_ja.txt
$ sudo wget http://svn.apache.org/repos/asf/lucene/dev/trunk/solr/example/solr/collection1/conf/lang/stopwords_ja.txt
and then create "webindex" index with analyzers for Japanese. (If you want to use uni-gram, remove cjk_bigram in filter)
$ curl -XPUT "localhost:9200/webindex" -d '
{
"settings" : {
"analysis" : {
"analyzer" : {
"default" : {
"type" : "custom",
"char_filter" : ["mappingJa"],
"tokenizer" : "standard",
"filter" : ["word_delimiter", "lowercase", "cjk_width", "cjk_bigram"]
}
},
"char_filter" : {
"mappingJa": {
"type" : "mapping",
"mappings_path" : "mapping_ja.txt"
}
},
"filter" : {
"stopJa" : {
"type" : "stop",
"stopwords_path" : "stopwords_ja.txt"
}
}
}
}
}'
Rewrite a property value by Script
River Web allows you to rewrite crawled data by Java's ScriptEngine. "javascript" is available. In "properties" object, put "script" value to a property you want to rewrite.
...
"properties" : {
...
"flag" : {
"text" : "body",
"script" : "value.indexOf('Elasticsearch') > 0 ? 'yes' : 'no';"
},
The above is, if a string value of body element in HTML contains "Elasticsearch", set "yes" to "flag" property.
Use HTTP proxy
Put "proxy" property in "crawl" property.
curl -XPUT 'localhost:9200/.river_web/config/my_web' -d '{
"index" : "webindex",
"type" : "my_web",
...
"proxy" : {
"host" : "proxy.server.com",
"port" : 8080
},
Specify next crawled urls when crawling
To set "isChildUrl" property to true, the property values is used as next crawled urls.
...
"target" : [
{
...
"properties" : {
"childUrl" : {
"value" : ["http://fess.codelibs.org/","http://fess.codelibs.org/ja/"],
"isArray" : true,
"isChildUrl" : true
},
Intercept start/execute/finish/close actions
You can insert your script to Executing Crawler(execute)/Finished Crawler(finish). To insert scripts, put "script" property as below:
curl -XPUT 'localhost:9200/.river_web/config/my_web' -d '{
"script":{
"execute":"your script...",
"finish":"your script...",
},
...
FAQ
What does "No scraping rule." mean?
In a river setting, "url" is starting urls to crawl a site, "include_urls" filters urls whether are crawled or not, and "target.pattern.url" is a rule to store extracted web data. If a crawling url does not match "target.pattern.url", you would see the message. Therefore, it means the crawled url does not have an extraction rule.
How to extract an attribute of meta tag
For example, if you want to grab a content of description's meta tag, the configuration is below:
...
"target" : [
...
"properties" : {
...
"meta" : {
"attr" : "meta[name=description]",
"args" : [ "content" ]
},
Incremental crawling dose not work?
"url" field needs to be "not_analyzed" in a mapping of your stored index. See Create Index To Store Crawl Data.
Where is crawled data stored?
crawled data are stored to ".s2robot" index during cralwing, data extracted from them are stored to your index specified by a river setting, and then data in "robot" index are removed when the crawler is finished.
Powered By
- Lasta Di: DI Container
- Fess Crawler: Web Crawler