elastic-import/lib/importer.js

CLI for import data to ElasticSearch

'use strict'

var elasticsearch = require('elasticsearch')
var _ = require('lodash')
var moment = require('moment')
var chalk = require('chalk')

function Importer (options) {
  this.options = options

  this.client = new elasticsearch.Client({
    host: options.host,
    log: options.log,
    requestTimeout: options.requestTimeout
  })
}

Importer.prototype.import = function (data, cb) {
  var self = this

  var body = []
  if (!_.isArray(data)) {
    data = [ data ]
  }

  data.map(function (record) {
    Object.keys(record).map(function (key) {
      if (_.isObject(record[ key ])) {
        if (record[ key ][ '$oid' ]) {
          record[ key ] = record[ key ][ '$oid' ]
        } else if (record[ key ][ '$date' ]) {
          record[ key ] = moment(record[ key ][ '$date' ]).toDate()
        }
      }
    })

    if (self.options.ignore) {
      self.options.ignore.split(',').map(function (ignore) {
        ignore = ignore.trim()
        if (ignore.indexOf('[*].') !== -1) {
          var field = ignore.substring(0, ignore.indexOf('[*]'))
          var obj = record[ field ]
          if (obj && _.isArray(obj)) {
            var afterField = ignore.substring(ignore.indexOf('[*].') + 4)
            obj.map(function (value) {
              _.unset(value, afterField)
            })
          }
        } else {
          _.unset(record, ignore)
        }
      })
    }

    if (self.options.transform) {
      record = self.options.transform(record) || record
    }
    
    if (record._id) {
      body.push({ index: { _index: self.options.index, _type: self.options.type, _id: record._id } })
      delete record._id
    } else {
      body.push({ index: { _index: self.options.index, _type: self.options.type } })
    }
    body.push(record)
  })

  self.client.bulk({ body: body }, function (err, resp) {
    if (err || resp.errors) {
      if (cb) {
        return cb(err || resp.errors)
      }

      var color = self.options.warnErrors ? chalk.yellow : chalk.red
      console.log(color('Elastic Import: Error importing data'))

      if (err) {
        console.log(err)
      } else {
        var errors = _.filter(resp.items, function (item) {
          return (item.index && item.index.error) || (item.create && item.create.error)
        })

        errors.map(function (item) {
          var message = item.index ? item.index.error : item.create.error
          console.log(
            color('Error: ' + message.type),
            color('-'), color('Reason: ' + message.reason),
            message.caused_by ? color('- Caused by: ' + message.caused_by.reason) : ''
          )
        })
        console.log(color('Elastic Import: Sent ' + data.length + ' records (' + errors.length + ' errors)'))
      }

      if (!self.options.warnErrors) {
        process.exit(1)
      }
    } else {
      console.log(chalk.green('Elastic Import: Sent ' + data.length + ' records'))
    }

    return cb && cb(null, resp)
  })
}

module.exports = Importer