wiki:Event/2013/GSoC/TextSearch

Version 34 (modified by Vishrut Mehta, 8 years ago) ( diff )

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Project: Full-Text Search

Name : Vishrut Mehta
Mentor: Pat Tressel

Proposal

The proposal for the project is here:
http://www.google-melange.com/gsoc/proposal/review/google/gsoc2013/vishrutmehta/6001

BluePrints

This project draws ideas from the Blueprints below:

Meetings And Discussions

Weekly Meeting : Tuesday and Saturday 04:30 UTC

Venue : IRC
Nick - vishrut009

Google Group Discussions :

Description of Work Done

  • Sunburnt
    • The script Attached below installs the dependencies and also configures and installs Apache Solr and Sunburnt
  • Solr Configuration and Schema changes
    • I have attached an installation script for installing all the dependencies and the solr configuration.
    • You can also install manually.
    • These are the following dependencies you would need to install:
      • Antiword
      • Pdfminer
      • Pyth
      • Httplib2
      • libxml2, lxml> 3.0
    • After installing all these dependencies, we would need to changed the solr config file, solr-4.3.x/example/solr/collection1/conf/solrconfig.xml
      • Change the directory path, where you want to store all the indexes. This can be stored anywhere, but better to keep in the eden directory. For example, as mentioned in installation script:
        <dataDir>/home/<user>/web2py/applications/eden/indices</dataDir>
        
    • You can also change this path according to you suitability, like if solr is on another machine, then the directory path would be different.
    • Now, we will discuss the schema changes in file solr-4.3.x/example/solr/collection1/conf/schema.xml -
      • Add the following in the <fields>..</fields> tag:
        <fields>
        .
        .
        
        <field name="tablename" type="text_general" indexed="true" stored="true"/>
        <field name="filetype" type="text_general" indexed="true" stored="true"/>
        <field name="filename" type="text_general" indexed="true" stored="true"/>
        
        .
        .
        </fields>
        
      • After adding this, after the <fields>..</fields> tag, add the following code for <copyfield>
        <copyField source="filetype" dest="text"/>
        <copyField source="tablename" dest="text"/>
        <copyField source="filename" dest="text"/>
        
        
      • So these are the configurations and the dependencies required for successful solr and sunburnt installation and integration in Eden.
  • Enabling text search:

-> Uncomment the following line in models/000_config.py

# Uncomment this and set the solr url to connect to solr server for Full-Text Search
settings.base.solr_url = "http://127.0.0.1:8983/solr/"

Specify the appropriate IP, like here it is 127.0.0.1
If you are running on different machine, then specify that IP accordingly.

  • Asynchronously Indexing and Deleting Documents:
    • The code for asynchronously indexing documents is in models/tasks.py
    • Insertion: The code will first insert the document into the database. Then in callback onaccept it will index those documents calling the document_create_index() function from models/tasks.py . The following code should be added for enabling Full Text search for documents in any modules. The example is there, you can see modules/s3db/doc.py in document_onaccept() hook.
    • Deletion: The code will first delete the record from the database table, then will select that file and will delete it from Solr also, by deleting its index which is stored in solr server. You can look for the code in modules/s3db/doc.py in document_ondelete() hook.
    • In model()
      
              if settings.get_base_solr_url():
                  onaccept = self.document_onaccept # where document_onaccept is the onaccept hook for indexing
                  ondelete = self.document_ondelete # where document_onaccept is the onaccept hook for deleting
              else:
                  onaccept = None
                  ondelete = None
      
              configure(tablename,
                        onaccept=onaccept,
                        ondelete=ondelete,
              .....
      
      
      
      
    • In onaccept()
          @staticmethod
          def document_onaccept(form):
      
              vars = form.vars
              doc = vars.file # where file is the name of the upload field
      
              table = current.db.doc_document # doc_document is the tablename
              try:
                  name = table.file.retrieve(doc)[0]
              except TypeError:
                  name = doc
      
              document = json.dumps(dict(filename=doc,
                                        name=name,
                                        id=vars.id,
                                        tablename="doc_document", # where "doc_document" is the name of the database table
                                        ))
      
              current.s3task.async("document_create_index",
                                   args = [document])
      
              return
      
      
      
      
    • in ondelete():
          @staticmethod
          def document_ondelete(row):
      
              db = current.db
              table = db.doc_document # doc_document is the tablename
      
              record = db(table.id == row.id).select(table.file, # where file is the name of the upload field
                                                     limitby=(0, 1)).first()
      
              document = json.dumps(dict(filename=record.file, # where file is the name of the upload field
                                        id=row.id,
                                       ))
      
              current.s3task.async("document_delete_index",
                                   args = [document])
      
              return
      
      

Full Text Functionality

  • The full text search functionality is integrated in modules/s3/s3resource.py, the fulltext() does the work.
  • The flow is: First the TEXT query goes to transform() function, which would split the query recursively and then transform the query.
  • After transforming, the query with TEXT operator will go to fulltext() function and would search for the keywords in the indexed documents.
  • It will retrieve document ids and then covert into a BELONGS S3ResourceQuery.
  • The code sample for the fulltext() is in models/s3/s3resource.py

Unit Test

  • Unit Tests are important part of any code function to check ifs its working according to our expectation.
  • For Full Text Search also, I have implemented it in modules/unit_tests/s3/s3resource.py - Class DocumentFullTextSearchTests
  • For checking the code in different situations, so all errors are removed, there are different tests implemented for it. The cases are:
    • When Solr is available (Solr server is running normally)
    • When Solr is unavailable (Solr server is not running, but enabled)
    • Checking the output of query() function
    • Checking the output of call() function



SMART Goal Measure Status
Explore Pylucene Installed and configured on demo server Completed
Scripts for indexing and search in pylucene Scripts working on the demo server Completed
Explore Apache Solr and Sunburnt Installed both on demo and local server Completed
Scripts for indexing and search for sunburnt Working scripts for sunburnt ready Completed
Asynchronously Indexing and Deleting Document Implemented & Integrated in Sahana Eden Completed
Install Script foe Installing and Configuring Solr and sunburnt Below is the link of the script Completed
Designing the Full-Text search functionality implementation Discussed with Dominic and Fran Completed
Implementation of fulltext() function in s3resource.py Successfully implemented with Error handling Completed
Implemented a transform() function to transform a TEXT query to belong query Successfully implemented with Error handling Completed
Unit tests for all cases(solr un/available, query(), call() ) Implemented the unit tests for s3resource Almost Done
Generic Indexing onaccept() hook, can be integrated in any module Implemented and tested on doc_document Completed

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