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elasticdump.js
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elasticdump.js
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var util = require('util')
var http = require('http')
var https = require('https')
var EventEmitter = require('events').EventEmitter
var url = require('url')
var vm = require('vm')
var ioHelper = require('./lib/ioHelper')
var getParams = function (query) {
if (!query) {
return {}
}
return (/^[?#]/.test(query) ? query.slice(1) : query)
.split('&')
.reduce((params, param) => {
let [ key, value ] = param.split('=')
params[key] = value ? decodeURIComponent(value.replace(/\+/g, ' ')) : ''
return params
}, { })
}
var elasticdump = function (input, output, options) {
var self = this
self.input = input
self.output = output
self.options = options
self.modifiers = []
if (output !== '$' && (self.options.toLog === null || self.options.toLog === undefined)) {
self.options.toLog = true
}
self.validationErrors = self.validateOptions()
if (options.maxSockets) {
self.log('globally setting maxSockets=' + options.maxSockets)
http.globalAgent.maxSockets = options.maxSockets
https.globalAgent.maxSockets = options.maxSockets
}
ioHelper(self, 'input')
ioHelper(self, 'output')
if (self.options.type === 'data' && self.options.transform) {
if (!(self.options.transform instanceof Array)) {
self.options.transform = [self.options.transform]
}
self.modifiers = self.options.transform.map(function (transform) {
if (transform[0] === '@') {
return function (doc) {
var parsed = url.parse(transform.slice(1))
return require(parsed.pathname)(doc, getParams(parsed.query))
}
} else {
var modificationScriptText = '(function(doc) { ' + transform + ' })'
return new vm.Script(modificationScriptText).runInThisContext()
}
})
}
}
util.inherits(elasticdump, EventEmitter)
elasticdump.prototype.log = function (message) {
var self = this
if (typeof self.options.logger === 'function') {
self.options.logger(message)
} else if (self.options.toLog === true) {
self.emit('log', message)
}
}
elasticdump.prototype.validateOptions = function () {
var self = this
var validationErrors = []
var required = ['input', 'output']
required.forEach(function (v) {
if (!self.options[v]) {
validationErrors.push('`' + v + '` is a required input')
}
})
return validationErrors
}
elasticdump.prototype.dump = function (callback, continuing, limit, offset, totalWrites) {
var self = this
if (self.validationErrors.length > 0) {
self.emit('error', {errors: self.validationErrors})
callback(new Error('There was an error starting this dump'))
} else {
if (!limit) { limit = self.options.limit }
if (!offset) { offset = self.options.offset }
if (!totalWrites) { totalWrites = 0 }
if (continuing !== true) {
self.log('starting dump')
if (self.options.offset) {
self.log('Warning: offsetting ' + self.options.offset + ' rows.')
self.log(" * Using an offset doesn't guarantee that the offset rows have already been written, please refer to the HELP text.")
}
if (self.modifiers.length) {
self.log('Will modify documents using these scripts: ' + self.options.transform)
}
}
self.input.get(limit, offset, function (err, data) {
if (err) { self.emit('error', err) }
if (!err || (self.options['ignore-errors'] === true || self.options['ignore-errors'] === 'true')) {
self.log('got ' + data.length + ' objects from source ' + self.inputType + ' (offset: ' + offset + ')')
if (self.modifiers.length) {
for (var i = 0; i < data.length; i++) {
self.modifiers.forEach(function (modifier) {
modifier(data[i])
})
}
}
self.output.set(data, limit, offset, function (err, writes) {
var toContinue = true
if (err) {
self.emit('error', err)
if (self.options['ignore-errors'] === true || self.options['ignore-errors'] === 'true') {
toContinue = true
} else {
toContinue = false
}
} else {
totalWrites += writes
if (data.length > 0) {
self.log('sent ' + data.length + ' objects to destination ' + self.outputType + ', wrote ' + writes)
offset = offset + data.length
}
}
if (data.length > 0 && toContinue) {
return self.dump(callback, true, limit, offset, totalWrites)
} else if (toContinue) {
self.log('Total Writes: ' + totalWrites)
self.log('dump complete')
if (typeof callback === 'function') { return callback(null, totalWrites) }
} else if (toContinue === false) {
self.log('Total Writes: ' + totalWrites)
self.log('dump ended with error (set phase) => ' + String(err))
if (typeof callback === 'function') { return callback(err, totalWrites) }
}
})
} else {
self.log('Total Writes: ' + totalWrites)
self.log('dump ended with error (get phase) => ' + String(err))
if (typeof callback === 'function') { return callback(err, totalWrites) }
}
})
}
}
module.exports = elasticdump