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driver.js
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driver.js
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// @flow
import { v1 as neo4j } from 'neo4j-driver'
import * as R from 'ramda'
import debug from 'debug'
import '../../polyfill'
import type { Query, QueryBuilder } from '../../types'
const logError = debug('Agregate:ConnectionError')
const logConnInit = debug('Agregate:ConnectionInitialized')
const logTx = debug('Agregate:ConnectionTransaction')
const logQueryStart = debug('Agregate:ConnectionQuery:started')
const logQueryResult = debug('Agregate:ConnectionQuery:fulled')
class Auth {
auth: Object;
constructor(auth) {
this.auth = auth
}
}
class BasicAuth extends Auth {
constructor(login: string, password: string) {
super(neo4j.auth.basic(login, password))
}
}
const rehydrationSession: {
nodes: {
// noinspection JSUnresolvedVariable
[key: string]: neo4j.types.Node
},
// noinspection JSUnresolvedVariable
relations: neo4j.types.Relation[]
} = {
nodes: {},
relations: []
}
const resetRehydrationSession = () =>
Object.assign(rehydrationSession, {
nodes: {},
relations: []
})
type Init = {
cluster?: boolean,
readonly?: boolean
};
export class Driver {
static basic = (...args) => new BasicAuth(...args);
init: Promise<void>;
driver: any;
session: any;
__transactionQueue = [];
constructor(host: string,
auth: Auth,
{ cluster = false, readonly = false }: Init = {}) {
const uri = `${cluster ? 'bolt+routing' : 'bolt'}://${host}`
let driver
let session
// eslint-disable-next-line promise/param-names
const timeout = new Promise(res => setTimeout(res, 1000))
// eslint-disable-next-line promise/avoid-new
const connectPromise = new Promise(async (resolve, reject) => {
await timeout
driver = neo4j.driver(uri, auth.auth)
// todo bring nifty tricks to protect API from writing clauses
session = driver.session(readonly ? 'READ' : 'WRITE')
driver.onCompleted = () => resolve([driver, session])
driver.onError = err => {
logError(err)
if (err.message.includes('authentication failure')) reject(err)
const getErrCode = R.path(['fields', 0, 'code'])
switch (getErrCode(err)) {
case 'Neo.ClientError.Security.Unauthorized':
reject(new Error(err.fields[0].message))
break
default:
console.error(err)
reject(new Error('unknown error encountered'))
break
}
}
})
const unlazyConnectionPromise = (async () => {
await timeout
const now = Date.now()
const response = await driver.session().run('return {now}', { now })
if (response.records[0]._fields[0] !== now) { throw new Error('connection is configured wrong') }
})()
this.init = Promise.all([
connectPromise,
unlazyConnectionPromise
]).then(([[driver, session]]) => {
this.driver = driver
this.session = session
logConnInit('Driver successfully initialized', this)
return true
})
// trick to disable default catch when any other .catch is executed
this.init.catch(err =>
logError('connection error encountered for', host, auth, err)
)
}
// noinspection JSUnusedGlobalSymbols
async close() {
await this.init.catch(err => err)
if (this.session) {
// noinspection JSUnresolvedFunction
await new Promise(resolve => this.session.close(resolve)) // eslint-disable-line promise/avoid-new
}
if (this.driver) {
// noinspection JSUnresolvedFunction
this.driver.close()
}
}
rehydrate(value: any): any {
if (Array.isArray(value)) {
// noinspection JSUnresolvedFunction
return value.map(entry => this.rehydrate(entry))
}
if (value instanceof neo4j.types.Node) {
return this.rehydrateNode(value)
}
if (value instanceof neo4j.types.Relationship) {
return this.rehydrateRelation(value)
}
if (neo4j.isInt(value)) {
// noinspection JSUnresolvedFunction
return value.toNumber()
}
return value
}
dehydrate(value: any): any {
if (Array.isArray(value)) {
// noinspection JSUnresolvedFunction
return value.map(entry => this.dehydrate(entry))
}
return value
}
// noinspection JSUnresolvedVariable
rehydrateRelation(value: neo4j.types.Relation): { start: any, end: any, [key: string]: any } {
const relation = this.resolveRelation(value)
rehydrationSession.relations.push(relation)
// noinspection JSUnresolvedVariable
relation.start = value.start
// noinspection JSUnresolvedVariable
relation.end = value.end
return relation
}
// noinspection JSUnresolvedVariable
rehydrateNode(value: neo4j.types.Node): Object {
const node = this.resolveNode(value)
rehydrationSession.nodes[value.identity.toString(36)] = node
return node
}
// noinspection JSMethodCanBeStatic, JSUnresolvedVariable
resolveRelation(value: neo4j.types.Relation): Object {
// noinspection JSUnresolvedVariable
return {
__type: 'relation',
labels: [value.type],
properties: value.properties
}
}
// noinspection JSMethodCanBeStatic, JSUnresolvedVariable
resolveNode(value: neo4j.types.Node): Object {
return {
__type: 'node',
labels: value.labels,
properties: value.properties
}
}
async query(...args: any[]) {
const tx = await this.transaction()
const result = await tx.query(...args)
await tx.commit()
return result
}
async transaction() {
await this.init
let res: () => any = () => {}
// eslint-disable-next-line promise/avoid-new
const deferred = new Promise(resolve => (res = resolve)).then(
() =>
(this.__transactionQueue = this.__transactionQueue.filter(
val => val !== deferred
))
)
const txQueueBeforeThisTx = [...this.__transactionQueue]
this.__transactionQueue.push(deferred)
await Promise.all(txQueueBeforeThisTx)
// noinspection JSUnresolvedFunction
return new Transaction(this.session.beginTransaction(), this, res)
}
}
export class Transaction {
tx: any;
__driver: Driver;
__res: () => any;
__isTransaction = true;
// noinspection JSUnusedGlobalSymbols
__onError: ?() => any;
constructor(tx: any, driver: Driver, res: () => any) {
logTx('beginning transaction')
this.tx = tx
this.__driver = driver
this.__res = res
}
// noinspection JSUnusedGlobalSymbols
async commit() {
logTx('committing transaction')
// noinspection JSUnresolvedFunction
await this.tx.commit()
this.__res()
}
// noinspection JSUnusedGlobalSymbols
async rollback() {
logTx('rolling back transaction')
// noinspection JSUnresolvedFunction
await this.tx.rollback()
this.__res()
}
async query(query: string | QueryBuilder | Query) {
try {
if (typeof query === 'string') {
return this.query({ statement: query })
}
if (query.toJSON instanceof Function) {
return this.query(query.toJSON())
}
await this.__driver.init
const { statement, parameters } = query
const dehydratedParameters = this.__driver.dehydrate(parameters)
logQueryStart(statement)
logQueryStart(dehydratedParameters)
// noinspection JSUnresolvedFunction
const response = await this.tx.run(statement, dehydratedParameters)
logQueryResult(
'server answered for',
statement,
'with params:',
dehydratedParameters
)
logQueryResult(response.summary)
if (Array.isArray(response.records)) {
for (const record of response.records) {
logQueryResult(record)
}
} else {
logQueryResult(response.records)
}
const { records } = response
resetRehydrationSession()
const result = this.__driver.rehydrate(
records.map(({ _fields }) => _fields)
)
rehydrationSession.relations.forEach(rel =>
Object.assign(rel, {
start: rehydrationSession.nodes[rel.start.toString(36)] || undefined,
end: rehydrationSession.nodes[rel.end.toString(36)] || undefined
})
)
for (const { labels, start, end } of rehydrationSession.relations) {
if (!start || !end) {
continue
}
const startRelations = start.__relations
const endRelations = end.__relations
const startKeys = Object.keys(start).filter(
key =>
start[key] &&
labels.includes(start[key].label) &&
start[key].direction >= 0
)
const endKeys = Object.keys(end).filter(
key =>
end[key] &&
labels.includes(end[key].label) &&
end[key].direction <= 0
)
for (const label of labels) {
for (const key of startKeys) {
if (start[key].label === label) {
if (start[key].isOnly) {
startRelations[key] = end
} else {
if (!startRelations[key]) {
startRelations[key] = []
}
startRelations[key].push(end)
}
}
}
for (const key of endKeys) {
if (end[key].label === label) {
if (end[key].isOnly) {
endRelations[key] = start
} else {
if (!endRelations[key]) {
endRelations[key] = []
}
endRelations[key].push(start)
}
}
}
}
}
logQueryResult(result)
return result
} catch (e) {
logError('query failed', query, e)
try {
// noinspection JSUnresolvedFunction
await this.tx.rollback()
} catch (e) {
// statements in the transaction have failed
// and the transaction has been rolled back by driver
// this is perfectly fine to ignore this error,
// this is paranoid case
}
this.__res()
throw e
}
}
}