良好且可靠的实践,以使Node.js客户端连接到gremlin服务器(均在同一服务器上运行)以进行CRUD操作

时间:2019-05-07 15:36:54

标签: node.js connection janusgraph gremlin-server

[在Ubuntu 18.04上] 我已经(并且被限制使用) janusgraph 创建一个角色存储库。我将使用graphDB,主要是因为角色关系与角色属性同等重要,并且结构需要灵活。我需要创建一个Node.js应用程序(最终使用+ pug和手写笔)来对graphDB中的数据进行 CRUD 操作,但是我不知道如何将客户端连接到服务器。 (研究显示了针对此问题的解决方案,但仅使用了不同的组件- Neo4j OrientDB 等)

我可以成功启动 gremlin服务器,然后尝试创建 gremlin控制台连接,例如以下

/opt/janusgraph-0.2.2-hadoop2/bin/gremlin.sh /opt/janusgraph-0.2.2-hadoop2/conf/gremlin-server/gremlin-server.yaml

yaml如下所示:

(和localhost一样,我也尝试了主机的特定IP地址,以及带有和不带有方括号,但结果相似的两个选项)

host: [localhost]
port: 8182
scriptEvaluationTimeout: 30000
channelizer: org.apache.tinkerpop.gremlin.server.channel.WebSocketChannelizer
graphs: {
  graph: conf/gremlin-server/janusgraph-cql-es-server.properties
}
plugins:
  - janusgraph.imports
scriptEngines: {
  gremlin-groovy: {
    imports: [java.lang.Math],
    staticImports: [java.lang.Math.PI],
    scripts: [scripts/empty-sample.groovy]}}
serializers:
  - { className: org.apache.tinkerpop.gremlin.driver.ser.GryoMessageSerializerV1d0, config: { ioRegistries: [org.janusgraph.graphdb.tinkerpop.JanusGraphIoRegistry] }}
  - { className: org.apache.tinkerpop.gremlin.driver.ser.GryoLiteMessageSerializerV1d0, config: {ioRegistries: [org.janusgraph.graphdb.tinkerpop.JanusGraphIoRegistry] }}
  - { className: org.apache.tinkerpop.gremlin.driver.ser.GryoMessageSerializerV1d0, config: { serializeResultToString: true }}
  - { className: org.apache.tinkerpop.gremlin.driver.ser.GraphSONMessageSerializerGremlinV1d0, config: { ioRegistries: [org.janusgraph.graphdb.tinkerpop.JanusGraphIoRegistryV1d0] }}
  - { className: org.apache.tinkerpop.gremlin.driver.ser.GraphSONMessageSerializerGremlinV2d0, config: { ioRegistries: [org.janusgraph.graphdb.tinkerpop.JanusGraphIoRegistry] }}
  - { className: org.apache.tinkerpop.gremlin.driver.ser.GraphSONMessageSerializerV1d0, config: { ioRegistries: [org.janusgraph.graphdb.tinkerpop.JanusGraphIoRegistryV1d0] }}
processors:
  - { className: org.apache.tinkerpop.gremlin.server.op.session.SessionOpProcessor, config: { sessionTimeout: 28800000 }}
  - { className: org.apache.tinkerpop.gremlin.server.op.traversal.TraversalOpProcessor, config: { cacheExpirationTime: 600000, cacheMaxSize: 1000 }}
metrics: {
  consoleReporter: {enabled: true, interval: 180000},
  csvReporter: {enabled: true, interval: 180000, fileName: /tmp/gremlin-server-metrics.csv},
  jmxReporter: {enabled: true},
  slf4jReporter: {enabled: true, interval: 180000},
  gangliaReporter: {enabled: false, interval: 180000, addressingMode: MULTICAST},
  graphiteReporter: {enabled: false, interval: 180000}}
maxInitialLineLength: 4096
maxHeaderSize: 8192
maxChunkSize: 8192
maxContentLength: 65536
maxAccumulationBufferComponents: 1024
resultIterationBatchSize: 64
writeBufferLowWaterMark: 32768
writeBufferHighWaterMark: 65536

标准输出看起来像这样:

         (o o)
-----oOOo-(3)-oOOo-----
plugin activated: janusgraph.imports
plugin activated: tinkerpop.server
plugin activated: tinkerpop.utilities
SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/opt/janusgraph-0.2.2-hadoop2/lib/slf4j-log4j12-1.7.12.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/opt/janusgraph-0.2.2-hadoop2/lib/logback-classic-1.1.2.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.
SLF4J: Actual binding is of type [org.slf4j.impl.Log4jLoggerFactory]
16:19:01 WARN  org.apache.hadoop.util.NativeCodeLoader  - Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
plugin activated: tinkerpop.hadoop
plugin activated: tinkerpop.spark
plugin activated: tinkerpop.tinkergraph
Error in /opt/janusgraph-0.2.2-hadoop2/conf/gremlin-server/gremlin-server.yaml at [1: host: [localhost]] - No such property: localhost for class: groovysh_evaluate

很显然,即使在服务器yaml的控制台中,我也假设或配置了错误的内容,我不知道同一个Yaml文件是否可以用于Node.js客户端连接。

我想我想要控制台连接,所以我可以从graphml文件导入启动程序数据,然后创建新条目,查询它们,更新它们并从前端Node.js应用程序中删除它们。

我该怎么办?

1 个答案:

答案 0 :(得分:0)

以下内容不会创建从Gremlin Console到Gremlin Server的任何连接:

/opt/janusgraph-0.2.2-hadoop2/bin/gremlin.sh /opt/janusgraph-0.2.2-hadoop2/conf/gremlin-server/gremlin-server.yaml

gremlin.sh不使用Gremlin Server yaml文件作为参数。只需启动bin/gremlin.sh,然后编写连接命令:

gremlin> :remote connect tinkerpop.server conf/remote.yaml

其中remote.yaml指向Gremlin Server。您可以在许多地方详细了解此内容,但我只是将您引向TinkerPop参考文档here