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sync.js
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sync.js
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#!/usr/bin/env node
'use strict'
const bluebird = require('bluebird');
global.Promise = bluebird;
const config = (process.env.CONFIG) ? JSON.parse(process.env.CONFIG) : require('./config.json');
const mongoose = require('mongoose');
mongoose.connect(process.env.MONGODB_URI || config.database);
const { ItemModel, CSVModel } = require('./models');
const request = require('request');
const iconv = require('iconv-lite');
const csvParser = require('csv-parser');
const _ = require('lodash');
const snappy = require('snappy')
// USING MONGO LIBRARY
// 2016-11-26, Curitiba - Brazil // @quagliato
//const mongodb = require('mongodb');
const mongoskin = require('mongoskin');
function sync(config, CSVModel, ItemModel) {
const insertModel = (csv, headers) => {
const separator = csv.separator || ';';
const find = { 'slug' : csv.slug };
const opt = { 'new': true, 'upsert': true }
csv.fields = _.map(_.split(headers, separator), (header) => {
return {name: header};
});
return CSVModel.findOneAndUpdate(find, csv, opt)
.then(result => {
return result.save();
})
.catch(err => {
console.error('On add headers', err);
})
};
let n = 0;
(function loop() {
if (n < config.base.csv.length) {
const csv = config.base.csv[n];
n = n + 1;
const separator = csv.separator || ';';
const line_validator = new RegExp(csv.line_validator || /^[-\s]+$/g);
const values = [];
// The insertQueue will be filled until 1000 records.
let insertQueue = [];
// When the insertQueue reaches 1000 records, it will be inserted as
// a batch.
let insertBatches = [];
let i = 0;
console.log(`-- Parsing ${csv.slug}`);
const dl = request({url: csv.url});
dl.pipe(iconv.decodeStream('ISO-8859-1'))
.pipe(iconv.encodeStream('utf8'))
.pipe(csvParser({separator: separator,raw: false}))
.on('headers', (headers) => {
console.log("Fields:",headers);
insertModel(csv, headers)
.catch(err => {
console.error('On add registers by batch operation', err);
});
})
.on('data', (record => {
i = i; // this line is here because next line bugs on heroku production
if (config.hasOwnProperty('max_parsing_lines') && i>=config.max_parsing_lines) {
dl.abort();
return false;
}
i += 1;
// Every 1000 records, the queue will be cleaned and its content will
// be added as a batch.
if ((i % 1000) === 0) {
console.log(i + " records enqueued");
let compress = snappy.compressSync(JSON.stringify(insertQueue));
insertBatches.push(compress);
insertQueue = [];
}
if (Object.keys(record).length > 0 && record[Object.keys(record)[0]] !== undefined && !line_validator.test(record[Object.keys(record)[0]])) {
record['base'] = csv.slug;
insertQueue.push(record);
}
return true;
}))
.on('end', () => {
// insertLoop process the batches (groups of 1000 records)
const mongoConnection = mongoskin.db(process.env.MONGODB_URI || config.database, {
native_parser: true,
auto_reconnect: true,
poolSize: 5,
});
let insertLoop = function(index, callback){
// If there's something left on the queue, insert it as a batch
if (insertQueue.length > 0) {
console.log(i + " records enqueued");
let compress = snappy.compressSync(JSON.stringify(insertQueue));
insertBatches.push(compress);
insertQueue = [];
}
// When all batches are processed, call the callback
if (index >= insertBatches.length) {
return callback();
}
let batch = insertBatches[index];
snappy.uncompress(batch, (err,decompressed) => {
mongoConnection.collection('items').insert(JSON.parse(decompressed), (err, results) => {
if (err) return false;
if (results) console.log((index + 1) + ' of ' + insertBatches.length + ' added!');
index += 1;
return insertLoop(index, callback);
});
})
};
ItemModel.remove({"base": csv.slug}).catch(err => { console.error(`On remove all from ${csv.slug}`)});
return insertLoop(0, () => {
console.log(`-- End parsing ${csv.slug} (${i} lines imported)`);
loop();
return true;
});
});
} else {
console.log('Exit');
process.exit()
}
}());
return true;
}
//// EXECUTE EVERY 5 DAYS
var date = new Date();
var day = date.getUTCDate();
if (day % 5 === 0) {
const base_json = process.env.BASE_JSON || config.base_json;
if ( base_json ) {
try {
request(base_json, function (error, response, body) {
if (!error && response.statusCode == 200) {
config.base = JSON.parse(body);
console.log('Loading csv databases ...');
sync(config, CSVModel, ItemModel);
} else {
console.log(error,response);
process.exit()
}
});
} catch (err) {
console.log(err);
process.exit()
}
} else {
if ( config.base ) {
console.log('Loading csv databases ...');
sync(config, CSVModel, ItemModel);
} else {
console.log('No base defined');
process.exit()
}
}
} else {
console.log('Not today');
process.exit()
}