zpwiki/pages/students/2016/jan_holp/dp2021/dp2021 zdrojove subory/cassandra.js

//Jan Holp, DP 2021


//client2 = cassandra
//client1  = elasticsearch 
//-----------------------------------------------------------------

//require the Elasticsearch librray
const elasticsearch = require('elasticsearch');
const client1 = new elasticsearch.Client({
   hosts: [ 'localhost:9200']
});
client1.ping({
     requestTimeout: 30000,
 }, function(error) {
 // at this point, eastic search is down, please check your Elasticsearch service
     if (error) {
         console.error('Elasticsearch cluster is down!');
     } else {
         console.log('ELasticSearch is ok');
     }
 });

//create new index skweb2
client1.indices.create({
    index: 'skweb2'
}, function(error, response, status) {
    if (error) {
        console.log(error);
    } else {
        console.log("created a new index", response);
    }
});

//indexing method
const bulkIndex = function bulkIndex(index, type, data) {
	let bulkBody = [];
	 id = 1;
const errorCount = 0;
/// dsdgfdhdhgdjd
	data.forEach(item => {
		bulkBody.push({
			index: {
				_index: index,
				_type:  type,
				_id :   id++, // id zmenit na url 
			}
		});
		bulkBody.push(item);
	});
       // console.log(bulkBody);
	client1.bulk({body: bulkBody})
		.then(response => {

			response.items.forEach(item => {
				if (item.index && item.index.error) {
					console.log(++errorCount, item.index.error);
				}
			});
			console.log(
				`Successfully indexed ${data.length - errorCount}
				out of ${data.length} items`
			);
		})
		.catch(console.err);
};


const cassandra = require('cassandra-driver');
const client2 = new cassandra.Client({ contactPoints: ['localhost:9042'], localDataCenter: 'datacenter1', keyspace: 'websucker' });
const query1 = 'SELECT domain_name FROM websucker.domain_quality WHERE good_count > 0 ALLOW FILTERING';
//const query2 = 'SELECT * from websucker.content WHERE domain_name = ' + domain_name[i] + 'ALLOW FILTERING'; // body_size > 0

//-------------------------------------------------------------------------

var domain_name = [];
var object_list = [];


client2.execute(query1)
  .then(result => {
  		let pole = result.rows.map(r => {
  			domain_name.push(r.domain_name)
  		});
  		console.log("Vsetky domenove mena : " , domain_name);
 	domain_name.forEach(name => {
			let query = 'SELECT * from websucker.content WHERE domain_name = ' + "'" + name + "'" + ' and body_size > 0 ALLOW FILTERING';
			client2.execute(query).then( res => {
				res.rows.map(rr => {
					object_list.push({
					 domain_name: rr.domain_name,
					 title: rr.title,
					 body: rr.body,
					 target_link : rr.target_link,
					 id : rr.target_link 
					 });
					 //console.log(object_list);
					 bulkIndex('skweb2', 'web_page', object_list);
					 //console.log(object_list);
				});

			}).catch(error => console.log(error));
})

}).catch(err => console.log(err));
 
setTimeout(() => console.log(object_list, 15000));