lib/gooddata/cloud_resources/redshift/redshift_client.rb
# encoding: UTF-8
# frozen_string_literal: true
#
# Copyright (c) 2010-2019 GoodData Corporation. All rights reserved.
# This source code is licensed under the BSD-style license found in the
# LICENSE file in the root directory of this source tree.
require 'securerandom'
require 'java'
require 'pathname'
require_relative '../cloud_resource_client'
base = Pathname(__FILE__).dirname.expand_path
Dir.glob(base + 'drivers/*.jar').each do |file|
require file unless file.start_with?('lcm-redshift-driver')
end
module GoodData
module CloudResources
class RedshiftClient < CloudResourceClient
class << self
def accept?(type)
type == 'redshift'
end
end
def initialize(options = {})
raise("Data Source needs a client to Redshift to be able to query the storage but 'redshift_client' is empty.") unless options['redshift_client']
if options['redshift_client']['connection'].is_a?(Hash)
@database = options['redshift_client']['connection']['database']
@schema = options['redshift_client']['connection']['schema'] || 'public'
@url = options['redshift_client']['connection']['url']
@authentication = options['redshift_client']['connection']['authentication']
else
raise('Missing connection info for Redshift client')
end
@debug = options['debug'] == true || options['debug'] == 'true'
Java.com.amazon.redshift.jdbc42.Driver
end
def realize_query(query, _params)
GoodData.gd_logger.info("Realize SQL query: type=redshift status=started")
connect
filename = "#{SecureRandom.urlsafe_base64(6)}_#{Time.now.to_i}.csv"
measure = Benchmark.measure do
statement = @connection.create_statement
schema_sql = "set search_path to #{@schema}"
statement.execute(schema_sql)
has_result = statement.execute(query)
if has_result
result = statement.get_result_set
metadata = result.get_meta_data
col_count = metadata.column_count
CSV.open(filename, 'wb') do |csv|
csv << Array(1..col_count).map { |i| metadata.get_column_name(i) } # build the header
csv << Array(1..col_count).map { |i| result.get_string(i)&.to_s } while result.next
end
end
end
GoodData.gd_logger.info("Realize SQL query: type=redshift status=finished duration=#{measure.real}")
filename
ensure
@connection.close unless @connection.nil?
@connection = nil
end
def connect
full_url = build_url(@url, @database)
GoodData.logger.info "Setting up connection to Redshift #{full_url}"
prop = java.util.Properties.new
if @authentication['basic']
prop.setProperty('UID', @authentication['basic']['userName'])
prop.setProperty('PWD', @authentication['basic']['password'])
else
prop.setProperty('AccessKeyID', @authentication['iam']['accessKeyId'])
prop.setProperty('SecretAccessKey', @authentication['iam']['secretAccessKey'])
prop.setProperty('DbUser', @authentication['iam']['dbUser'])
end
@connection = java.sql.DriverManager.getConnection(full_url, prop)
end
private
def build_url(url, database)
url_parts = url.split('?')
url_path = url_parts[0].chomp('/')
url_path += "/#{database}" if database && !url_path.end_with?("/#{database}")
url_parts.length > 1 ? url_path + '?' + url_parts[1] : url_path
end
end
end
end