python - 如何让 Gremlin-Python 与 gremlin-server 3.4.3 一起工作？

Question

我的环境是:

java -version
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)

python3 --version
Python 3.7.4

这应该是唯一相关的环境部分。不幸的是，我在 MacOS 上并使用 macports 可能会有所不同，这不应该是一个问题。

我刚刚在 Ubuntu 18.04 LTS 上进行了测试，请参阅 http://wiki.bitplan.com/index.php/Gremlin_python#Installlation_automation并且行为是相同的。

所以我想尝试一下 gremlin-python。我发现https://pypi.org/project/gremlinpython/并高兴地添加了

gremlinpython

我的要求.txt

sudo -H pip install -r requirements.txt

运行成功 - 太棒了。让我们找一些 python 代码来玩一下。

https://gist.githubusercontent.com/okram/f193d5616563a69ad5714a42c504276f/raw/b8075410e400e18f18360015945f3760d99d044a/gremlin-python-play.py

有。

哦 - 我需要一台服务器...

下载吧

http://ftp-stud.hs-esslingen.de/pub/Mirrors/ftp.apache.org/dist/tinkerpop/3.4.3/apache-tinkerpop-gremlin-server-3.4.3-bin.zip

解压缩它并为其创建一个启动文件，如上面的示例所示:

gspath=$HOME/Downloads/apache-tinkerpop-gremlin-server-3.4.3
#$gspath/bin/gremlin-server.sh install org.apache.tinkerpop gremlin-python 3.4.3
$gspath/bin/gremlin-server.sh $gspath/conf/gremlin-server-modern-py.yaml

它不起作用 - 从 Tornado 中获得 599 超时。

看:

Why can't I connect to Gremlin-Server?

尝试提示，例如使用 0.0.0.0 作为主机

检查启动情况。

糟糕 - 有错误:

Could not initialize gremlin-jython GremlinScriptEngine as init script could not be evaluated
java.util.concurrent.CompletionException: java.lang.IllegalArgumentException: gremlin-jython is not an available GremlinScriptEngine
    at java.util.concurrent.CompletableFuture.reportJoin(CompletableFuture.java:375)
    at java.util.concurrent.CompletableFuture.join(CompletableFuture.java:1934)
    at org.apache.tinkerpop.gremlin.server.util.ServerGremlinExecutor.lambda$new$4(ServerGremlinExecutor.java:141)
    at java.util.LinkedHashMap$LinkedKeySet.forEach(LinkedHashMap.java:559)
    at org.apache.tinkerpop.gremlin.server.util.ServerGremlinExecutor.<init>(ServerGremlinExecutor.java:136)
    at org.apache.tinkerpop.gremlin.server.GremlinServer.<init>(GremlinServer.java:122)
    at org.apache.tinkerpop.gremlin.server.GremlinServer.<init>(GremlinServer.java:86)
    at org.apache.tinkerpop.gremlin.server.GremlinServer.main(GremlinServer.java:345)
Caused by: java.lang.IllegalArgumentException: gremlin-jython is not an available GremlinScriptEngine
    at org.apache.tinkerpop.gremlin.jsr223.CachedGremlinScriptEngineManager.registerLookUpInfo(CachedGremlinScriptEngineManager.java:95)
    at org.apache.tinkerpop.gremlin.jsr223.CachedGremlinScriptEngineManager.getEngineByName(CachedGremlinScriptEngineManager.java:58)
    at org.apache.tinkerpop.gremlin.groovy.engine.GremlinExecutor.lambda$eval$0(GremlinExecutor.java:266)
    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
    at java.lang.Thread.run(Thread.java:748)
[WARN] ServerGremlinExecutor - Could not initialize gremlin-python GremlinScriptEngine as init script could not be evaluated
java.util.concurrent.CompletionException: java.lang.IllegalArgumentException: gremlin-python is not an available GremlinScriptEngine
    at java.util.concurrent.CompletableFuture.reportJoin(CompletableFuture.java:375)
    at java.util.concurrent.CompletableFuture.join(CompletableFuture.java:1934)
    at org.apache.tinkerpop.gremlin.server.util.ServerGremlinExecutor.lambda$new$4(ServerGremlinExecutor.java:141)
    at java.util.LinkedHashMap$LinkedKeySet.forEach(LinkedHashMap.java:559)
    at org.apache.tinkerpop.gremlin.server.util.ServerGremlinExecutor.<init>(ServerGremlinExecutor.java:136)
    at org.apache.tinkerpop.gremlin.server.GremlinServer.<init>(GremlinServer.java:122)
    at org.apache.tinkerpop.gremlin.server.GremlinServer.<init>(GremlinServer.java:86)
    at org.apache.tinkerpop.gremlin.server.GremlinServer.main(GremlinServer.java:345)
Caused by: java.lang.IllegalArgumentException: gremlin-python is not an available GremlinScriptEngine
    at org.apache.tinkerpop.gremlin.jsr223.CachedGremlinScriptEngineManager.registerLookUpInfo(CachedGremlinScriptEngineManager.java:95)
    at org.apache.tinkerpop.gremlin.jsr223.CachedGremlinScriptEngineManager.getEngineByName(CachedGremlinScriptEngineManager.java:58)
    at org.apache.tinkerpop.gremlin.groovy.engine.GremlinExecutor.lambda$eval$0(GremlinExecutor.java:266)
    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
    at java.lang.Thread.run(Thread.java:748)

gremlin-python is not an available GremlinScriptEngine

提到应该安装服务器插件。我原以为

$gspath/bin/gremlin-server.sh install org.apache.tinkerpop gremlin-python 3.4.3

会这样做，当我再次运行它时，我得到:

Installing dependency org.apache.tinkerpop gremlin-python 3.4.3
Could not install the dependency: a module with the name gremlin-python is already installed

如何从这里开始工作？

我将 python 测试代码缩减为:

# https://pypi.org/project/gremlinpython/

# start GremlinServer
# bin/gremlin-server.sh -i org.apache.tinkerpop gremlin-python 3.2.2-SNAPSHOT
# bin/gremlin-server.sh conf/gremlin-server-modern-py.yaml

# in practice, you really only need the 3 imports below

from gremlin_python import statics
from gremlin_python.structure.graph import Graph
from gremlin_python.driver.driver_remote_connection import DriverRemoteConnection
# this allows us to do g.V().repeat(out()) instead of g.V().repeat(__.out())-type traversals

#statics.load_statics(globals())

# create a remote connection using RemoteStrategy

graph = Graph()
g = graph.traversal().withRemote(DriverRemoteConnection('ws://localhost:8182','g'))

print (g.V().count().value())

Answer 1

我怀疑您已经有解决方法了 - 但我认为 599 是由于您无法在本地计算机设置之外的任何其他设备上访问 ws 端口。我在隔离安装时遇到了类似的问题。

如果您将 gremlin yaml 中的主机属性设置为 0.0.0.0 - 它将监听所有接口(interface)。在本地主机上测试所有内容给了我一种错误的安全感 - 当我监听所有网络接口(interface)时起作用 - 这反过来又允许我拥有与 gremlin 服务器不同的客户端。