Class: Sequelizer::ConnectionMaker

Inherits:
Object
  • Object
show all
Defined in:
lib/sequelizer/connection_maker.rb

Overview

Class that handles loading/interpretting the database options and creates the Sequel connection

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(options = nil) ⇒ ConnectionMaker

Accepts an optional set of database options

If no options are provided, attempts to read options from config/database.yml

If config/database.yml doesn’t exist, Dotenv is used to try to load a .env file, then uses any SEQUELIZER_* environment variables as database options



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# File 'lib/sequelizer/connection_maker.rb', line 20

def initialize(options = nil)
  @options = Options.new(options)
end

Instance Attribute Details

#options ⇒ Object (readonly)

The options for Sequel.connect



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# File 'lib/sequelizer/connection_maker.rb', line 10

def options
  @options
end

Instance Method Details

#connection ⇒ Object

Returns a Sequel connection to the database



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# File 'lib/sequelizer/connection_maker.rb', line 25

def connection
  opts = options.to_hash
  extensions = options.extensions

  conn = if url = (opts.delete(:uri) || opts.delete(:url))
    Sequel.connect(url, opts)
  else
    # Kerberos related options
    realm = opts[:realm]
    host_fqdn = opts[:host_fqdn] || opts[:host]
    principal = opts[:principal]

    adapter = opts[:adapter]
    if adapter =~ /\Ajdbc_/
      user = opts[:user]
      password = opts[:password]
    end

    case opts[:adapter] && opts[:adapter].to_sym
    when :jdbc_hive2
      opts[:adapter]  = :jdbc
      auth = if realm
        ";principal=#{e principal}/#{e host_fqdn}@#{e realm}"
      elsif user
        ";user=#{e user};password=#{e password}"
      else
        ';auth=noSasl'
      end
      opts[:uri] = "jdbc:hive2://#{e opts[:host]}:#{opts.fetch(:port, 21050).to_i}/#{e(opts[:database] || 'default')}#{auth}"
    when :jdbc_impala
      opts[:adapter]  = :jdbc
      auth = if realm
        ";AuthMech=1;KrbServiceName=#{e principal};KrbAuthType=2;KrbHostFQDN=#{e host_fqdn};KrbRealm=#{e realm}"
      elsif user
        if password
          ";AuthMech=3;UID=#{e user};PWD=#{e password}"
        else
          ";AuthMech=2;UID=#{e user}"
        end
      end
      opts[:uri] = "jdbc:impala://#{e opts[:host]}:#{opts.fetch(:port, 21050).to_i}/#{e(opts[:database] || 'default')}#{auth}"
    when :jdbc_postgres
      opts[:adapter]  = :jdbc
      auth = "?user=#{user}#{"&password=#{password}" if password}" if user
      opts[:uri] = "jdbc:postgresql://#{e opts[:host]}:#{opts.fetch(:port, 5432).to_i}/#{e(opts[:database])}#{auth}"
    when :impala
      opts[:database] ||= 'default'
      opts[:port] ||= 21000
      if principal
        # realm doesn't seem to be used?
        opts[:transport] = :sasl
        opts[:sasl_params] = {
          mechanism: "GSSAPI",
          remote_host: host_fqdn,
          remote_principal: principal
        }
      end
    end

    Sequel.connect(opts)
  end
  conn.extension(*extensions)
  conn
end