Class: PostgresPR::Connection

Inherits:
Object
  • Object
show all
Defined in:
lib/postgres-pr/connection.rb

Defined Under Namespace

Classes: Result

Constant Summary collapse

DEFAULT_PORT = 
5432
DEFAULT_HOST = 
'localhost'
DEFAULT_PATH = 
'/tmp'
DEFAULT_URI = 
if RUBY_PLATFORM.include?('win')
  'tcp://' + DEFAULT_HOST + ':' + DEFAULT_PORT.to_s 
else
  'unix:' + File.join(DEFAULT_PATH, '.s.PGSQL.' + DEFAULT_PORT.to_s)  
end

Instance Method Summary collapse

Constructor Details

#initialize(database, user, password = nil, uri = nil) ⇒ Connection

sync



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# File 'lib/postgres-pr/connection.rb', line 19

def initialize(database, user, password=nil, uri = nil)
  uri ||= DEFAULT_URI

  raise unless @mutex.nil?

  @mutex = Mutex.new

  @mutex.synchronize {
    @params = {}
    establish_connection(uri)
  
    @conn << StartupMessage.new(PROTO_VERSION, 'user' => user, 'database' => database).dump

    loop do
      msg = Message.read(@conn)

      case msg
      when AuthentificationClearTextPassword
        raise ArgumentError, "no password specified" if password.nil?
        @conn << PasswordMessage.new(password).dump

      when AuthentificationCryptPassword
        raise ArgumentError, "no password specified" if password.nil?
        @conn << PasswordMessage.new(password.crypt(msg.salt)).dump

      when AuthentificationMD5Password
        raise ArgumentError, "no password specified" if password.nil?
        require 'digest/md5'

        m = Digest::MD5.hexdigest(password + user) 
        m = Digest::MD5.hexdigest(m + msg.salt)
        m = 'md5' + m
        @conn << PasswordMessage.new(m).dump

      when AuthentificationKerberosV4, AuthentificationKerberosV5, AuthentificationSCMCredential
        raise "unsupported authentification"

      when AuthentificationOk
      when ErrorResponse
        raise "authentification failed"
      when NoticeResponse
        # TODO
      when ParameterStatus
        @params[msg.key] = msg.value
      when BackendKeyData
        # TODO
        #p msg
      when ReadyForQuery
        # TODO: use transaction status
        break
      else
        raise "unhandled message type"
      end
    end
  }
end

Instance Method Details

#query(sql) ⇒ Object 



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# File 'lib/postgres-pr/connection.rb', line 83

def query(sql)
  @mutex.synchronize {
    @conn << Query.dump(sql)

    result = Result.new
    errors = []

    loop do
      msg = Message.read(@conn)
      case msg
      when DataRow
        result.rows << msg.columns
      when CommandComplete
      when ReadyForQuery
        break
      when RowDescription
        result.fields = msg.fields
      when CopyInResponse
      when CopyOutResponse
      when EmptyQueryResponse
      when ErrorResponse
        # TODO
        errors << msg
      when NoticeResponse
        p msg
      else
        # TODO
      end
    end

    raise errors.map{|e| e.inspect}.join("   ") unless errors.empty?

    result
  }
end