How to use gremlin - 10 common examples
To help you get started, we’ve selected a few gremlin examples, based on popular ways it is used in public projects.
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aws-samples / amazon-neptune-samples / gremlin / visjs-neptune / indexLambda.js View on Github 
body: JSON.stringify(nodes)
};
console.log("Initialize call response: " + JSON.stringify(data));
callback(null, response);
context.done();
dc.close(); // look at this carefully!!!
}).
catch(error => {
console.log('ERROR', error);
dc.close();
});
}
if (event.pathParameters.proxy.match(/search/ig)) {
g.V().has('name', gremlin.process.P.between(event.queryStringParameters.username, event.queryStringParameters.touser)).limit(20).valueMap(true).toList().then(
data => {
console.log(JSON.stringify(data));
var response = {
statusCode: 200,
headers: headers,
body: JSON.stringify(data)
};
console.log("Search call response: " + JSON.stringify(data));
callback(null, response);
context.done();
dc.close(); // look at this carefully!!!
}).
catch(error => {
console.log('ERROR', error);
dc.close();
});exports.handler = function(event, context, callback) {
var DriverRemoteConnection = gremlin.driver.DriverRemoteConnection;
var Graph = gremlin.structure.Graph;
//Use wss:// for secure connections. See https://docs.aws.amazon.com/neptune/latest/userguide/access-graph-ssl.html
dc = new DriverRemoteConnection('wss://'+process.env.NEPTUNE_CLUSTER_ENDPOINT+':'+process.env.NEPTUNE_PORT+'/gremlin');
var graph = new Graph();
var g = graph.traversal().withRemote(dc);
const headers = {
'Access-Control-Allow-Origin': '*',
'Access-Control-Allow-Methods': 'OPTIONS, POST, GET',
'Access-Control-Max-Age': 2592000, // 30 days
/** add other headers as per requirement */
'Access-Control-Allow-Headers' : '*',
"Content-Type": "application/json"
};
console.log("Path Parameters => "+ event.pathParameters);this.cosmos_gremlin_uri = process.env.AZURE_COSMOSDB_GRAPHDB_URI; // https://cjoakimcosmosdbgremlin.documents.azure.com:443/
this.cosmos_gremlin_wssuri = 'wss://' + this.cosmos_gremlin_acct + '.gremlin.cosmosdb.azure.com:443/gremlin';
this.graph_coll_link = '/dbs/' + this.cosmos_gremlin_db + '/colls/' + this.cosmos_gremlin_graph;
console.log('cosmos_gremlin_acct: ' + this.cosmos_gremlin_acct);
console.log('cosmos_gremlin_db: ' + this.cosmos_gremlin_db);
console.log('cosmos_gremlin_graph: ' + this.cosmos_gremlin_graph);
console.log('cosmos_gremlin_views: ' + this.cosmos_gremlin_views);
console.log('cosmos_gremlin_wssuri: ' + this.cosmos_gremlin_wssuri);
console.log('graph_coll_link: ' + this.graph_coll_link);
// Gremlin client
var guri = this.cosmos_gremlin_wssuri;
var gkey = this.cosmos_gremlin_key
var glink = this.graph_coll_link;
var authenticator = new gremlin.driver.auth.PlainTextSaslAuthenticator(glink, gkey);
this.gremlin_client = new gremlin.driver.Client(
guri,
{
authenticator,
traversalsource : "g",
rejectUnauthorized : true,
mimeType : "application/vnd.gremlin-v2.0+json"
}
);
// SQL client
var suri = this.cosmos_gremlin_uri;
var skey = this.cosmos_gremlin_key;
this.sql_client = new CosmosClient({ endpoint: suri, auth: { masterKey: skey } });
}this.cosmos_gremlin_wssuri = 'wss://' + this.cosmos_gremlin_acct + '.gremlin.cosmosdb.azure.com:443/gremlin';
this.graph_coll_link = '/dbs/' + this.cosmos_gremlin_db + '/colls/' + this.cosmos_gremlin_graph;
console.log('cosmos_gremlin_acct: ' + this.cosmos_gremlin_acct);
console.log('cosmos_gremlin_db: ' + this.cosmos_gremlin_db);
console.log('cosmos_gremlin_graph: ' + this.cosmos_gremlin_graph);
console.log('cosmos_gremlin_views: ' + this.cosmos_gremlin_views);
console.log('cosmos_gremlin_wssuri: ' + this.cosmos_gremlin_wssuri);
console.log('graph_coll_link: ' + this.graph_coll_link);
// Gremlin client
var guri = this.cosmos_gremlin_wssuri;
var gkey = this.cosmos_gremlin_key
var glink = this.graph_coll_link;
var authenticator = new gremlin.driver.auth.PlainTextSaslAuthenticator(glink, gkey);
this.gremlin_client = new gremlin.driver.Client(
guri,
{
authenticator,
traversalsource : "g",
rejectUnauthorized : true,
mimeType : "application/vnd.gremlin-v2.0+json"
}
);
// SQL client
var suri = this.cosmos_gremlin_uri;
var skey = this.cosmos_gremlin_key;
this.sql_client = new CosmosClient({ endpoint: suri, auth: { masterKey: skey } });
}var TitanFactory = g.java.import('com.thinkaurelius.titan.core.TitanFactory');
var gt = TitanFactory.openSync(conf);
g.SetGraph(gt);
gt.makeTypeSync().nameSync("foo").dataTypeSync(Type.String.class).indexedSync(Type.Vertex.class)
.uniqueSync(Direction.BOTH, UniqCon.NO_LOCK).makePropertyKeySync();
// var vertex = gt.addVertexSync(null);
// vertex.setPropertySync('name', 'Frank');
// gt.commitSync();
//g.v(8, 12).consoleOut();
// g.E().has('weight', T.gt, g.Float(0.2)).property('weight').consoleOut();
// g.V('name','Frank').consoleOut();
g.V().consoleOut();
console.log("All good!");/*Titan specific Enums <<<<<*/
//console.log(TTC.LABEL.toString());
//console.log(TTC.KEY.toString());
//console.log(UniqCon.LOCK.toString());
//console.log(UniqCon.NO_LOCK.toString());
var BaseConfiguration = g.java.import('org.apache.commons.configuration.BaseConfiguration');
conf = new BaseConfiguration();
conf.setPropertySync("storage.backend","cassandra");
conf.setPropertySync("storage.hostname","127.0.0.1");
conf.setPropertySync("storage.keyspace","titan");
var TitanFactory = g.java.import('com.thinkaurelius.titan.core.TitanFactory');
var gt = TitanFactory.openSync(conf);
g.SetGraph(gt);
gt.makeTypeSync().nameSync("foo").dataTypeSync(Type.String.class).indexedSync(Type.Vertex.class)
.uniqueSync(Direction.BOTH, UniqCon.NO_LOCK).makePropertyKeySync();
// var vertex = gt.addVertexSync(null);
// vertex.setPropertySync('name', 'Frank');
// gt.commitSync();
//g.v(8, 12).consoleOut();
// g.E().has('weight', T.gt, g.Float(0.2)).property('weight').consoleOut();
// g.V('name','Frank').consoleOut();
g.V().consoleOut();
console.log("All good!");exports.handler = function(event, context, callback) {
var DriverRemoteConnection = gremlin.driver.DriverRemoteConnection;
var Graph = gremlin.structure.Graph;
//Use wss:// for secure connections. See https://docs.aws.amazon.com/neptune/latest/userguide/access-graph-ssl.html
dc = new DriverRemoteConnection('wss://'+process.env.NEPTUNE_CLUSTER_ENDPOINT+':'+process.env.NEPTUNE_PORT+'/gremlin');
var graph = new Graph();
var g = graph.traversal().withRemote(dc);
const headers = {
'Access-Control-Allow-Origin': '*',
'Access-Control-Allow-Methods': 'OPTIONS, POST, GET',
'Access-Control-Max-Age': 2592000, // 30 days
/** add other headers as per requirement */
'Access-Control-Allow-Headers' : '*',
"Content-Type": "application/json"
};
console.log("Path Parameters => "+ event.pathParameters);
console.log("event.pathParameters.proxy => "+ event.pathParameters.proxy);private async executeQuery(queryId: number, gremlinQuery: string): Promise {
this.log(`Executing query #${queryId}: ${gremlinQuery}`);
const client = gremlin.createClient(
this._configuration.endpointPort,
this._configuration.endpoint,
{
"session": false,
"ssl": this._configuration.endpointPort === 443 || this._configuration.endpointPort === 8080,
"user": `/dbs/${this._configuration.databaseName}/colls/${this._configuration.graphName}`,
"password": this._configuration.key
});
// Patch up handleProtocolMessage as a temporary work-around for https://github.com/jbmusso/gremlin-javascript/issues/93
var originalHandleProtocolMessage = client.handleProtocolMessage;
client.handleProtocolMessage = function handleProtocolMessage(message) {
if (!message.binary) {
// originalHandleProtocolMessage isn't handling non-binary messages, so convert this one back to binary
message.data = new Buffer(message.data);
message.binary = true;constructor(dialect, port, url, options) {
// Constants
this.DIALECTS = {AZURE: 'azure'};
this.STRING = 'string';
this.NUMBER = 'number';
this.BOOLEAN = 'boolean';
this.DATE = 'date';
const argLength = arguments.length;
if (argLength === 0) {
this.client = null;
} else if (argLength === 1) {
this.client = Gremlin.createClient();
} else if (argLength === 3) {
this.client = Gremlin.createClient(port, url);
} else {
this.client = Gremlin.createClient(port, url, options);
}
if (Array.isArray(dialect)) {
this.dialect = dialect[0];
this.partition = dialect[1];
}
else {
this.dialect = dialect;
}
this.definedVertices = {};
this.definedEdges = {};
this.vertexModel = VertexModel;
this.edgeModel = EdgeModel;constructor(dialect, port, url, options) {
// Constants
this.DIALECTS = {AZURE: 'azure'};
this.STRING = 'string';
this.NUMBER = 'number';
this.BOOLEAN = 'boolean';
this.DATE = 'date';
const argLength = arguments.length;
if (argLength === 0) {
this.client = null;
} else if (argLength === 1) {
this.client = Gremlin.createClient();
} else if (argLength === 3) {
this.client = Gremlin.createClient(port, url);
} else {
this.client = Gremlin.createClient(port, url, options);
}
if (Array.isArray(dialect)) {
this.dialect = dialect[0];
this.partition = dialect[1];
}
else {
this.dialect = dialect;
}
this.definedVertices = {};
this.definedEdges = {};
this.vertexModel = VertexModel;
this.edgeModel = EdgeModel;
}
