/
index.js
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/
index.js
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'use strict';
var Bluebird = require('bluebird'),
Stream = require('stream'),
csv = require('csv'),
fs = Bluebird.promisifyAll(require('fs')),
through = require('through2'),
elasticsearch = require('elasticsearch'),
elasticsearchStreams = require('elasticsearch-streams'),
WritableBulk = elasticsearchStreams.WritableBulk,
TransformToBulk = elasticsearchStreams.TransformToBulk;
function Importer (config) {
config = config || {};
this.filename = config.filename || "geonames.txt";
this.client = config.client || new elasticsearch.Client(config.elasticsearch || {
host: 'localhost:9200'
});
this.idField = config.idField || 'id';
this.index = config.index || 'geoname';
this.type = config.type || 'geoname';
this.transformers = config.transformers || [];
}
module.exports = Importer;
Importer.prototype.import = function (filename) {
var self = this;
return Bluebird.cast(filename || self.filename)
.then(function (filename) {
return new Bluebird(function (resolve, reject) {
fs.createReadStream(filename)
.pipe(csv.parse({
delimiter: "\t",
quote: false,
columns : [
'id',
'name',
'asciiName',
'alternateNames',
'latitude',
'longitude',
'featureClass',
'featureCode',
'countryCode',
'cc2',
'admin1Code',
'admin2Code',
'admin3Code',
'admin4Code',
'population',
'elevation',
'dem',
'timezone',
'modificationDate'
]
}))
.pipe(self.createCustomTransformStream())
.pipe(self.createBulkTransformStream())
.pipe(self.createBulkImportStream())
.on('error', reject)
.on('finish', resolve);
})
})
.return(filename);
};
Importer.prototype.postcodes = function (filename) {
var self = this;
return Bluebird.cast(filename || self.filename)
.then(function (filename) {
return new Bluebird(function (resolve, reject) {
fs.createReadStream(filename)
.pipe(csv.parse({
delimiter: "\t",
quote: false,
columns : [
'countryCode',
'postalCode',
'placeName',
'admin1Name',
'admin1Code',
'admin2Name',
'admin2Code',
'admin3Name',
'admin3Code',
'latitude',
'longitude',
'accuracy'
]
}))
.pipe(self.createCustomTransformStream())
.pipe(self.createBulkTransformStream())
.pipe(self.createBulkImportStream())
.on('error', reject)
.on('finish', resolve);
});
})
.return(filename);
};
Importer.prototype.addTransformer = function (transformer) {
this.transformers.push(transformer);
return this;
};
Importer.prototype.createCustomTransformStream = function () {
var self = this;
return through.obj(function (item, enc, next) {
var result = self.transformers.reduce(function (item, fn) {
if (!item) {
return item;
}
else {
return fn(item);
}
}, item);
if (result) {
this.push(result);
}
next();
});
};
Importer.prototype.createBulkTransformStream = function () {
var self = this;
return new TransformToBulk(function (doc) {
return {
_index: self.index,
_type: self.type,
_id: doc[self.idField]
};
});
};
Importer.prototype.createBulkImportStream = function () {
var self = this;
return new WritableBulk(function (commands, callback) {
self.client.bulk({
index: self.index,
body: commands
}, callback);
}, 32);
};