forked from nullibrew/node-red-contrib-nulli-neo4j
/
neo4j.js
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neo4j.js
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const neo4j = require('neo4j-driver')
module.exports = function (RED) {
function Neo4jBolt (config) {
RED.nodes.createNode(this, config)
var node = this
node.server = RED.nodes.getNode(config.server)
const driver = node.server.driver
const session = driver.session() // session for status display
if (session) {
node.status({
fill: 'green',
shape: 'dot',
text: 'node-red:common.status.connected'
})
node.on('input', function (msg) {
var query = config.query || msg.query
/*
* Need one session per request
* ref: https://stackoverflow.com/questions/62615761/queries-cannot-be-run-directly-on-a-session-with-an-open-transaction-either-run
*/
var boltSession = msg.database
? driver.session({database: msg.database}) // use msg.database if supplied
: driver.session()
let params = null
if (typeof (msg.params) === 'string') {
params = JSON.parse(msg.params)
} else {
params = msg.params
}
function processInteger (integer) {
if (integer.constructor.name === 'Integer') {
return integer.toNumber()
}
return integer
}
function processRecord (record) {
if (record.constructor.name === 'Integer') {
return record.toNumber()
}
if (record.constructor.name === 'Path') {
record.start.identity = processInteger(record.start.identity)
record.end.identity = processInteger(record.end.identity)
record.segments = record.segments.map(segment => {
segment.start.identity = processInteger(segment.start.identity)
segment.end.identity = processInteger(segment.end.identity)
segment.relationship.identity = processInteger(segment.relationship.identity)
segment.relationship.start = processInteger(segment.relationship.start)
segment.relationship.end = processInteger(segment.relationship.end)
return segment
})
return record
}
if (record.constructor.name === 'Relationship') {
record.identity = processInteger(record.identity)
record.start = processInteger(record.start)
record.end = processInteger(record.end)
return record
}
if (record.constructor.name === 'Node') {
record.identity = processInteger(record.identity)
return record
}
return record
}
boltSession.run(query, params).then(result => {
if (result.records.length > 1) {
msg.payload = [];
result.records.forEach(function (record, index, array) {
let itm = {};
record.forEach(function (item, index, array) {
itm[index] = processRecord(item)
})
msg.payload.push(itm)
})
node.send([null, msg])
} else if (result.records.length == 1) {
let itm = {};
result.records[0].forEach(function (item, index, array) {
itm[index] = processRecord(item)
})
msg.payload = itm
node.send([msg, null])
} else {
msg.payload = null
node.send([msg, null])
}
boltSession.close()
})
.catch(err => {
boltSession.close()
node.error(err, msg);
})
})
} else {
node.status({
fill: 'red',
shape: 'dot',
text: 'node-red:common.status.disconnected'
})
}
node.on('close', function () {
session.close()
driver.close()
})
}
RED.nodes.registerType('neo4j-bolt', Neo4jBolt)
}