Gremlin python

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

• http://tinkerpop.apache.org/downloads.html

Installlation automation

#!/bin/bash
# WF 2019-09-17
# test gremlin-python

# see https://stackoverflow.com/questions/57936915/how-do-i-get-gremlin-python-with-gremlin-server-3-4-3-to-work

# check that the given program is installed
checkinstalled() {  
  local l_prg="$1"
  local l_version="$2"
  local l_package="$3"
  which $l_prg
  if [ $? -ne 0 ]
  then
    echo "$l_prg is not available - shall i install it from $l_package y/n?"
    read x
    case $x in
      y) sudo apt-get install $l_package;;
      *) echo "aborting ..."
         exit 1;;
    esac
  fi 
  $l_prg $l_version
}

echo "checking prerequisites ..."
checkinstalled java "-version" "openjdk-8-jre"
checkinstalled python "--version" "python2.7"
checkinstalled pip "--version" "python-pip"
version=3.4.3
mirror=http://mirror.dkd.de/apache/tinkerpop/$version
gsd=apache-tinkerpop-gremlin-server-${version}
gcd=apache-tinkerpop-gremlin-console-${version}

for d in $gsd $gcd
do
  if [ ! -d $d ]
  then
    zip=$d-bin.zip
    if [ ! -f $zip ]
    then
      echo "downloading $zip"
      curl -s $mirror/$zip -o $zip
    else
      echo "$zip already downloaded"
    fi
    echo "unzipping $zip"
    unzip $zip
  else
    echo "$d already unzipped"
  fi 
done

echo "starting gremlin-server ..."
conf=$(realpath $gsd/conf/gremlin-server-modern-py.yaml)
$gsd/bin/gremlin-server.sh $conf