@webwallet/graphstore/lib/database/neo4j/index.js

Graph database queries and connection handling.

'use strict'

const errors = require('./errors')
const queries = require('./queries')

const Connection = require('./connection')
const Session = require('./session')
const Transaction = require('./transaction')

class Graphstore {
  static async connect(params) {
    let driver = await Connection.open(params)
    let session = new Session(driver)

    let db = {
      query: async (name, params, options = {}) => {
        let query = queries[name]
        if (!query) throw new Error('invalid-query')

        let type = query.txmode || options.txmode
        let transaction = options.transaction || new Transaction(driver, type)
        let result

        try {
          result = await transaction.run(query.string, params)
        } catch (error) {
          return errors.handle(error)
        }

        result.records = result.records.map(record => query.parser(record))

        return {transaction, records: result.records}
      }
    }

    return db
  }
  static async session(driver) {
    return new Session(driver)
  }
}

module.exports = Graphstore