Difference between revisions of "Gremlin python"

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= Installation helper script =
 
= Installation helper script =
 
<source lang='bash'>
 
<source lang='bash'>
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#!/bin/bash
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git clone https://github.com/WolfgangFahl/gremlin-python-tutorial
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# WF 2019-09-17
 
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# test gremlin-python
 
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# see https://stackoverflow.com/questions/57936915/how-do-i-get-gremlin-python-with-gremlin-server-3-4-3-to-work
 
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version=3.4.3
 
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mirror=http://mirror.dkd.de/apache/tinkerpop/$version
 
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gsd=apache-tinkerpop-gremlin-server-${version}
 
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gcd=apache-tinkerpop-gremlin-console-${version}
 
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# check that the given program is installed
 
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checkinstalled() {
 
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  local l_prg="$1"
 
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  local l_version="$2"
 
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  local l_package="$3"
 
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  which $l_prg
 
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  if [ $? -ne 0 ]
 
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  then
 
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    echo "$l_prg is not available - shall i install it from $l_package y/n?"
 
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    read x
 
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    case $x in
 
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      y) sudo apt-get install $l_package;;
 
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      *) echo "aborting ..."
 
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        exit 1;;
 
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    esac
 
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  fi
 
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  $l_prg $l_version
 
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}
 
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install() {
 
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  echo "checking prerequisites ..."
 
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  checkinstalled java "-version" "openjdk-8-jre"
 
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  checkinstalled python "--version" "python2.7"
 
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  checkinstalled pip "--version" "python-pip"
 
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  for d in $gsd $gcd
 
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  do
 
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    if [ ! -d $d ]
 
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    then
 
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      zip=$d-bin.zip
 
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      if [ ! -f $zip ]
 
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      then
 
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        echo "downloading $zip"
 
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        curl -s $mirror/$zip -o $zip
 
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      else
 
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        echo "$zip already downloaded"
 
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      fi
 
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      echo "unzipping $zip"
 
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      unzip $zip
 
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    else
 
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      echo "$d already unzipped"
 
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    fi
 
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  done
 
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}
 
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# commandline option
 
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while [  "$1" != ""  ]
 
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do
 
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  option=$1
 
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  shift
 
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  case $option in
 
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    -i|--install)
 
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      install;;
 
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    -s|--server)
 
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      echo "starting gremlin-server ..."
 
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      #conf=$(realpath $gsd/conf/gremlin-server-modern-py.yaml)
 
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      conf=$(realpath $gsd/conf/gremlin-server-modern.yaml)
 
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      $gsd/bin/gremlin-server.sh $conf
 
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      ;;
 
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    -c|--console)
 
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      echo "starting gremlin-console ..."
 
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      $gcd/bin/gremlin.sh
 
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      ;;
 
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    -h|--help)
 
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      usage;;
 
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    *)
 
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      usage;;
 
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  esac
 
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done
 
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</source>
 
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== Trial result ==
 
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<source lang='bash'>
 
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# install needed parts
 
 
./run -i
 
./run -i
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checking prerequisites ...
 
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/usr/bin/java
 
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java version "1.8.0_172"
 
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Java(TM) SE Runtime Environment (build 1.8.0_172-b11)
 
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Java HotSpot(TM) 64-Bit Server VM (build 25.172-b11, mixed mode)
 
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/usr/bin/python
 
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Python 2.7.5
 
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/opt/local/bin/pip
 
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pip 19.2.3 from /opt/local/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/pip (python 3.7)
 
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apache-tinkerpop-gremlin-server-3.4.3 already unzipped
 
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apache-tinkerpop-gremlin-console-3.4.3 already unzipped
 
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# run gremlin server
 
 
./run -s
 
./run -s
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starting gremlin-server ...
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# in another console
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[INFO] GremlinServer - 3.4.3
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./run -p
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        \,,,/
 
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        (o o)
 
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-----oOOo-(3)-oOOo-----
 
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[INFO] GremlinServer - Configuring Gremlin Server from /Users/wf/source/python/gremlintest/apache-tinkerpop-gremlin-server-3.4.3/conf/gremlin-server-modern.yaml
 
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[INFO] MetricManager - Configured Metrics Slf4jReporter configured with interval=180000ms and loggerName=org.apache.tinkerpop.gremlin.server.Settings$Slf4jReporterMetrics
 
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[INFO] DefaultGraphManager - Graph [graph] was successfully configured via [conf/tinkergraph-empty.properties].
 
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[INFO] ServerGremlinExecutor - Initialized Gremlin thread pool.  Threads in pool named with pattern gremlin-*
 
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[INFO] ServerGremlinExecutor - Initialized GremlinExecutor and preparing GremlinScriptEngines instances.
 
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[INFO] ServerGremlinExecutor - Initialized gremlin-groovy GremlinScriptEngine and registered metrics
 
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[INFO] ServerGremlinExecutor - A GraphTraversalSource is now bound to [g] with graphtraversalsource[tinkergraph[vertices:0 edges:0], standard]
 
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[INFO] OpLoader - Adding the standard OpProcessor.
 
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[INFO] OpLoader - Adding the session OpProcessor.
 
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[INFO] OpLoader - Adding the traversal OpProcessor.
 
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[INFO] TraversalOpProcessor - Initialized cache for TraversalOpProcessor with size 1000 and expiration time of 600000 ms
 
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[INFO] GremlinServer - Executing start up LifeCycleHook
 
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[INFO] Logger$info - Loading 'modern' graph data.
 
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[INFO] GremlinServer - idleConnectionTimeout was set to 0 which resolves to 0 seconds when configuring this value - this feature will be disabled
 
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[INFO] GremlinServer - keepAliveInterval was set to 0 which resolves to 0 seconds when configuring this value - this feature will be disabled
 
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[WARN] AbstractChannelizer - The org.apache.tinkerpop.gremlin.driver.ser.GryoMessageSerializerV3d0 serialization class is deprecated.
 
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[INFO] AbstractChannelizer - Configured application/vnd.gremlin-v3.0+gryo with org.apache.tinkerpop.gremlin.driver.ser.GryoMessageSerializerV3d0
 
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[WARN] AbstractChannelizer - The org.apache.tinkerpop.gremlin.driver.ser.GryoMessageSerializerV3d0 serialization class is deprecated.
 
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[INFO] AbstractChannelizer - Configured application/vnd.gremlin-v3.0+gryo-stringd with org.apache.tinkerpop.gremlin.driver.ser.GryoMessageSerializerV3d0
 
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[INFO] AbstractChannelizer - Configured application/vnd.gremlin-v3.0+json with org.apache.tinkerpop.gremlin.driver.ser.GraphSONMessageSerializerV3d0
 
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[INFO] AbstractChannelizer - Configured application/json with org.apache.tinkerpop.gremlin.driver.ser.GraphSONMessageSerializerV3d0
 
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[INFO] AbstractChannelizer - Configured application/vnd.graphbinary-v1.0 with org.apache.tinkerpop.gremlin.driver.ser.GraphBinaryMessageSerializerV1
 
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[INFO] AbstractChannelizer - Configured application/vnd.graphbinary-v1.0-stringd with org.apache.tinkerpop.gremlin.driver.ser.GraphBinaryMessageSerializerV1
 
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[INFO] GremlinServer$1 - Gremlin Server configured with worker thread pool of 1, gremlin pool of 2 and boss thread pool of 1.
 
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[INFO] GremlinServer$1 - Channel started at port 8182.
 
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# and in an other console
 
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./run -c
 
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starting gremlin-console ...
 
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        \,,,/
 
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        (o o)
 
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-----oOOo-(3)-oOOo-----
 
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plugin activated: tinkerpop.server
 
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plugin activated: tinkerpop.utilities
 
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plugin activated: tinkerpop.tinkergraph
 
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gremlin> g=traversal().withRemote(DriverRemoteConnection('ws://localhost:8182/gremlin','g'))
 
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No signature of method: groovysh_evaluate.DriverRemoteConnection() is applicable for argument types: (String, String) values: [ws://localhost:8182/gremlin, g]
 
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Type ':help' or ':h' for help.
 
 
</source>
 
</source>

Revision as of 15:03, 17 September 2019

This mini-tutorial is inspired by this stackoverflow question

The goal is to get access to an apache tinkerpop/gremlin graph database via Python.

Prerequisites

  1. Java
  2. Python
  3. Gremlin-Server
  4. Gremlin-Console (for debugging)

Installing Java

sudo apt-get install openjdk-8-jre 
java -version
openjdk version "1.8.0_222"
OpenJDK Runtime Environment (build 1.8.0_222-8u222-b10-1ubuntu1~18.04.1-b10)
OpenJDK 64-Bit Server VM (build 25.222-b10, mixed mode)

Installing Python and Pip

sudo apt install python2.7
python --version
Python 2.7.15+
sudo apt install python-pip
pip --version
pip 9.0.1 from /usr/lib/python2.7/dist-packages (python 2.7)

Installing Gremlin Server and Console

Installation helper script

git clone https://github.com/WolfgangFahl/gremlin-python-tutorial
./run -i
./run -s
# in another console
./run -p
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