Difference between revisions of "Gremlin python"

From BITPlan Wiki
Jump to navigation Jump to search
Line 28: Line 28:
 
= Installation helper script =
 
= Installation helper script =
 
<source lang='bash'>
 
<source lang='bash'>
−
#!/bin/bash
+
git clone https://github.com/WolfgangFahl/gremlin-python-tutorial
−
# 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
 
−
version=3.4.3
 
−
mirror=http://mirror.dkd.de/apache/tinkerpop/$version
 
−
gsd=apache-tinkerpop-gremlin-server-${version}
 
−
gcd=apache-tinkerpop-gremlin-console-${version}
 
−
 
 
−
# 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
 
−
}
 
−
 
 
−
install() {
 
−
  echo "checking prerequisites ..."
 
−
  checkinstalled java "-version" "openjdk-8-jre"
 
−
  checkinstalled python "--version" "python2.7"
 
−
  checkinstalled pip "--version" "python-pip"
 
−
 
 
−
  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
 
−
}
 
−
 
 
−
# commandline option
 
−
while [  "$1" != ""  ]
 
−
do
 
−
  option=$1
 
−
  shift
 
−
  case $option in
 
−
    -i|--install)
 
−
      install;;
 
−
    -s|--server)
 
−
      echo "starting gremlin-server ..."
 
−
      #conf=$(realpath $gsd/conf/gremlin-server-modern-py.yaml)
 
−
      conf=$(realpath $gsd/conf/gremlin-server-modern.yaml)
 
−
      $gsd/bin/gremlin-server.sh $conf
 
−
      ;;
 
−
    -c|--console)
 
−
      echo "starting gremlin-console ..."
 
−
      $gcd/bin/gremlin.sh
 
−
      ;;
 
−
    -h|--help)
 
−
      usage;;
 
−
    *)
 
−
      usage;;
 
−
  esac
 
−
done
 
−
</source>
 
−
== Trial result ==
 
−
<source lang='bash'>
 
−
# install needed parts
 
 
./run -i
 
./run -i
−
checking prerequisites ...
 
−
/usr/bin/java
 
−
java version "1.8.0_172"
 
−
Java(TM) SE Runtime Environment (build 1.8.0_172-b11)
 
−
Java HotSpot(TM) 64-Bit Server VM (build 25.172-b11, mixed mode)
 
−
/usr/bin/python
 
−
Python 2.7.5
 
−
/opt/local/bin/pip
 
−
pip 19.2.3 from /opt/local/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/pip (python 3.7)
 
−
apache-tinkerpop-gremlin-server-3.4.3 already unzipped
 
−
apache-tinkerpop-gremlin-console-3.4.3 already unzipped
 
−
# run gremlin server
 
 
./run -s
 
./run -s
−
starting gremlin-server ...
+
# in another console
−
[INFO] GremlinServer - 3.4.3
+
./run -p
−
        \,,,/
 
−
        (o o)
 
−
-----oOOo-(3)-oOOo-----
 
−
 
 
−
[INFO] GremlinServer - Configuring Gremlin Server from /Users/wf/source/python/gremlintest/apache-tinkerpop-gremlin-server-3.4.3/conf/gremlin-server-modern.yaml
 
−
[INFO] MetricManager - Configured Metrics Slf4jReporter configured with interval=180000ms and loggerName=org.apache.tinkerpop.gremlin.server.Settings$Slf4jReporterMetrics
 
−
[INFO] DefaultGraphManager - Graph [graph] was successfully configured via [conf/tinkergraph-empty.properties].
 
−
[INFO] ServerGremlinExecutor - Initialized Gremlin thread pool.  Threads in pool named with pattern gremlin-*
 
−
[INFO] ServerGremlinExecutor - Initialized GremlinExecutor and preparing GremlinScriptEngines instances.
 
−
[INFO] ServerGremlinExecutor - Initialized gremlin-groovy GremlinScriptEngine and registered metrics
 
−
[INFO] ServerGremlinExecutor - A GraphTraversalSource is now bound to [g] with graphtraversalsource[tinkergraph[vertices:0 edges:0], standard]
 
−
[INFO] OpLoader - Adding the standard OpProcessor.
 
−
[INFO] OpLoader - Adding the session OpProcessor.
 
−
[INFO] OpLoader - Adding the traversal OpProcessor.
 
−
[INFO] TraversalOpProcessor - Initialized cache for TraversalOpProcessor with size 1000 and expiration time of 600000 ms
 
−
[INFO] GremlinServer - Executing start up LifeCycleHook
 
−
[INFO] Logger$info - Loading 'modern' graph data.
 
−
[INFO] GremlinServer - idleConnectionTimeout was set to 0 which resolves to 0 seconds when configuring this value - this feature will be disabled
 
−
[INFO] GremlinServer - keepAliveInterval was set to 0 which resolves to 0 seconds when configuring this value - this feature will be disabled
 
−
[WARN] AbstractChannelizer - The org.apache.tinkerpop.gremlin.driver.ser.GryoMessageSerializerV3d0 serialization class is deprecated.
 
−
[INFO] AbstractChannelizer - Configured application/vnd.gremlin-v3.0+gryo with org.apache.tinkerpop.gremlin.driver.ser.GryoMessageSerializerV3d0
 
−
[WARN] AbstractChannelizer - The org.apache.tinkerpop.gremlin.driver.ser.GryoMessageSerializerV3d0 serialization class is deprecated.
 
−
[INFO] AbstractChannelizer - Configured application/vnd.gremlin-v3.0+gryo-stringd with org.apache.tinkerpop.gremlin.driver.ser.GryoMessageSerializerV3d0
 
−
[INFO] AbstractChannelizer - Configured application/vnd.gremlin-v3.0+json with org.apache.tinkerpop.gremlin.driver.ser.GraphSONMessageSerializerV3d0
 
−
[INFO] AbstractChannelizer - Configured application/json with org.apache.tinkerpop.gremlin.driver.ser.GraphSONMessageSerializerV3d0
 
−
[INFO] AbstractChannelizer - Configured application/vnd.graphbinary-v1.0 with org.apache.tinkerpop.gremlin.driver.ser.GraphBinaryMessageSerializerV1
 
−
[INFO] AbstractChannelizer - Configured application/vnd.graphbinary-v1.0-stringd with org.apache.tinkerpop.gremlin.driver.ser.GraphBinaryMessageSerializerV1
 
−
[INFO] GremlinServer$1 - Gremlin Server configured with worker thread pool of 1, gremlin pool of 2 and boss thread pool of 1.
 
−
[INFO] GremlinServer$1 - Channel started at port 8182.
 
−
# and in an other console
 
−
./run -c
 
−
starting gremlin-console ...
 
−
 
 
−
        \,,,/
 
−
        (o o)
 
−
-----oOOo-(3)-oOOo-----
 
−
plugin activated: tinkerpop.server
 
−
plugin activated: tinkerpop.utilities
 
−
plugin activated: tinkerpop.tinkergraph
 
−
gremlin> g=traversal().withRemote(DriverRemoteConnection('ws://localhost:8182/gremlin','g'))
 
−
No signature of method: groovysh_evaluate.DriverRemoteConnection() is applicable for argument types: (String, String) values: [ws://localhost:8182/gremlin, g]
 
−
Type ':help' or ':h' for help.
 
 
</source>
 
</source>

Revision as of 14:03, 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
Retrieved from "https://wiki.bitplan.com/index.php?title=Gremlin_python&oldid=9810"