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OsProject
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id	DgraphAndWeaviateTest
state
owner	Wolfgang Fahl
title	DgraphAndWeaviateTest
url	https://github.com/WolfgangFahl/DgraphAndWeaviateTest
version	0.0.1
description
date	2020/08/05
since
until

This is sample project to test Python based access to Dgraph, Weaviate and Apache Jena

Installation and test

Prerequisites

python > version 3.6 - tested with version 3.6/3.7/3.8
docker e.g. docker desktop community - tested with e.g. docker desktop 2.3.0.4 Docker version 19.03.12
java e.g. openjdk - tested with Java 1.8 and Java 11
Operating system that can run bash scripts e.g. macports, linux - tested on Mac OS 10.13.6 Macports 2.6.2, Ubuntu 18.04 LTS

Installation

https://github.com/WolfgangFahl/DgraphAndWeaviateTest
cd DgraphAndWeaviateTest
scripts/install

Starting servers

Test

scripts/test

Dgraph

Dgraph Installation

docker based pull:

scripts/dgraph -p

Dgraph start

docker based start of

alpha
ratel
zero

scripts/dgraph

Dgraph stop

scripts/dgraph -k

scripts/dgraph usage

scripts/dgraph -h
scripts/dgraph [-b|--bash|-c|--clean|-h|--help|-k|--kill|-p|--pull]

-b | --bash: start a bash terminal shell within the currently running container
-h | --help: show this usage
-k | --kill: stop the docker image
-p | --pull: pull the docker image
-c | --clean: clean start with kill and purge of all data

Apache Jena

The jena -l and jena -f options will automatically download and unpack the needed Apache jena files.

Jena load example dataset

scripts/jena -l sampledata/example.ttl

Jena fuseki server start

scripts/jena -f example

You should be able to browse the admin GUI at http://localhost:3030 and have the example dataset ready for you

Jena fuseki server stop

scripts/jena -k

jena script usage

scripts/jena -h
scripts/jena [-f|--fuseki|-h|--help|-k|--kill|-l|--load]

-f | --fuseki [dataset]: download and start fuseki server with the given dataset
-h | --help: show this usage
-k | --kill: kill the running fuseki server
-l | --load [ttl file]: download jena / tdbloader and load given ttl file

Example unit tests

Apache unit test

see https://github.com/WolfgangFahl/DgraphAndWeaviateTest/blob/master/tests/testJena.py

'''
Created on 2020-08-14
@author: wf
'''
import unittest
import getpass
from dg.jena import Jena


class TestJena(unittest.TestCase):
    ''' Test Apache Jena access '''

    def setUp(self):
        pass


    def tearDown(self):
        pass

    def getJena(self,mode='query'):
        endpoint="http://localhost:3030/example/%s" % mode
        jena=Jena(endpoint)
        return jena

    def testJenaQuery(self):
        '''
        test Apache Jena Fuseki SPARQL endpoint with example data
        '''
        jena=self.getJena()
        queryString = "SELECT * WHERE { ?s ?p ?o. }"
        results=jena.query(queryString)
        self.assertTrue(len(results)>20)
        pass
    
    def testJenaInsert(self):
        jena=self.getJena(mode="update")
        insertString = """
        PREFIX cr: <http://cr.bitplan.com/>
        INSERT DATA { 
          cr:version cr:author "Wolfgang Fahl". 
        }
        """
        results=jena.rawQuery(insertString)
        print (results)
    
    def testLocalWikdata(self):
        '''
        check local wikidata
        '''
        # check we have local wikidata copy:
        if getpass.getuser()=="wf":
            # use 2018 wikidata copy
            endpoint="http://blazegraph.bitplan.com/sparql"
            jena=Jena(endpoint)
            queryString="""
            SELECT ?item ?coord 
WHERE 
{
  # instance of whisky distillery
  ?item wdt:P31 wd:Q10373548.
  # get the coordindate
  ?item wdt:P625 ?coord.
}"""
            results=jena.query(queryString)
            self.assertEqual(238,len(results))


if __name__ == "__main__":
    #import sys;sys.argv = ['', 'Test.testName']
    unittest.main()

Dgraph unit test

def testDgraph(self):
        ''' 
        test basic Dgraph operation
        '''
        dgraph=Dgraph(debug=True)
        # drop all data and schemas
        dgraph.drop_all()
        # create a schema for Pokemons
        schema='''
        name: string @index(exact) .
        weight: float .
        height: float .
type Pokemon {
   name
   weight
   height
}'''
        dgraph.addSchema(schema)
        # prepare a list of Pokemons to be added
        pokemonList=[{'name':'Pikachu', 'weight':  6, 'height': 0.4 },
                  {'name':'Arbok',   'weight': 65, 'height': 3.5 }, 
                  {'name':'Raichu',  'weight': 30, 'height': 0.8 }, 
                  {'name':'Sandan',  'weight': 12, 'height': 0.6 }]
        # add the list in a single transaction
        dgraph.addData(obj=pokemonList)
        # retrieve the data via GraphQL+ query
        graphQuery='''{
# list of pokemons
  pokemons(func: has(name), orderasc: name) {
    name
    weight
    height
  }
}'''
        queryResult=dgraph.query(graphQuery)
        # check the result
        self.assertTrue('pokemons' in queryResult)
        pokemons=queryResult['pokemons']
        self.assertEqual(len(pokemonList),len(pokemons))
        sortindex=[1,0,2,3]
        for index,pokemon in enumerate(pokemons):
            expected=pokemonList[sortindex[index]]
            self.assertEquals(expected,pokemon)
        # close the database connection
        dgraph.close()

Example test session

see https://travis-ci.org/github/WolfgangFahl/DgraphAndWeaviateTest/jobs/715131236

DgraphAndWeaviateTest

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