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const _ = require('lodash');
const util = require('util');
const fs = require('fs');
const path = require('path');
const jsonStream = require('JSONStream');
const debug = require('debug')('express-cassandra');
const importer = {
buildTableQueryForDataRow(keyspace, tableInfo, row) {
row = _.omitBy(row, (item) => (item === null));
let query = util.format('INSERT INTO "%s"."%s" ("%s") VALUES (?%s)', keyspace, tableInfo.name, _.keys(row).join('","'), _.repeat(',?', _.keys(row).length - 1));
let params = _.values(row);
if (tableInfo.isCounterTable) {
const primaryKeyFields = _.pick(row, tableInfo.primaryKeys);
const otherKeyFields = _.omit(row, tableInfo.primaryKeys);
const setQueries = _.map(_.keys(otherKeyFields), (key) => util.format('"%s"="%s" + ?', key, key));
const whereQueries = _.map(_.keys(primaryKeyFields), (key) => util.format('"%s"=?', key));
query = util.format('UPDATE "%s"."%s" SET %s WHERE %s', keyspace, tableInfo.name, setQueries.join(', '), whereQueries.join(' AND '));
params = _.values(otherKeyFields).concat(_.values(primaryKeyFields));
}
params = _.map(params, (param) => {
Iif (_.isPlainObject(param)) {
if (param.type === 'Buffer') {
return Buffer.from(param);
}
const omittedParams = _.omitBy(param, (item) => (item === null));
Object.keys(omittedParams).forEach((key) => {
if (_.isObject(omittedParams[key]) && omittedParams[key].type === 'Buffer') {
omittedParams[key] = Buffer.from(omittedParams[key]);
}
});
return omittedParams;
}
return param;
});
return { query, params };
},
processTableImport(systemClient, fixtureDirectory, keyspace, table, batchSize) {
return new Promise((resolve, reject) => {
debug('==================================================');
debug(`Reading metadata for table: ${table}`);
systemClient.metadata.getTable(keyspace, table)
.then((tableInfo) => {
Iif (!tableInfo) {
resolve();
return;
}
const isCounterTable = _.some(tableInfo.columns, (column) => (column.type.code === 5));
if (isCounterTable) batchSize = 1;
let primaryKeys = [];
primaryKeys = primaryKeys.concat(_.map(tableInfo.partitionKeys, (item) => item.name));
primaryKeys = primaryKeys.concat(_.map(tableInfo.clusteringKeys, (item) => item.name));
tableInfo.isCounterTable = isCounterTable;
tableInfo.primaryKeys = primaryKeys;
let queryPromises = [];
let queries = [];
let processed = 0;
debug(`Creating read stream from: ${table}.json`);
const jsonfile = fs.createReadStream(path.join(fixtureDirectory, `${table}.json`), { encoding: 'utf8' });
const readStream = jsonfile.pipe(jsonStream.parse('*'));
readStream.on('data', (row) => {
processed++;
const query = this.buildTableQueryForDataRow(keyspace, tableInfo, row);
if (batchSize > 1) {
queries.push(query);
if (queries.length >= batchSize) {
queryPromises.push(systemClient.batch(queries, { prepare: true }));
queries = [];
}
} else {
queryPromises.push(systemClient.execute(query.query, query.params, { prepare: true }));
}
const processPauseSize = (batchSize >= 10) ? batchSize * 10 : 100;
if (processed % processPauseSize === 0) {
readStream.pause();
Promise.all(queryPromises)
.then(() => {
queryPromises = [];
readStream.resume();
})
.catch((err) => {
reject(err);
});
}
if (processed % 1000 === 0) {
debug(`Streaming ${processed} rows to table: ${table}`);
}
});
readStream.on('error', (err) => {
reject(err);
});
const startTime = Date.now();
readStream.on('end', () => {
debug(`Streaming ${processed} rows to table: ${table}`);
if (queries.length > 1) {
queryPromises.push(systemClient.batch(queries, { prepare: true }));
} else if (queries.length === 1) {
queryPromises.push(systemClient.execute(queries[0].query, queries[0].params, { prepare: true }));
}
Promise.all(queryPromises)
.then(() => {
const timeTaken = (Date.now() - startTime) / 1000;
const throughput = timeTaken ? processed / timeTaken : 0.00;
debug(`Done with table, throughput: ${throughput.toFixed(1)} rows/s`);
resolve();
})
.catch((err) => {
reject(err);
});
});
})
.catch((err) => {
reject(err);
});
});
},
};
module.exports = importer;
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