Class: MysqlReplicator::Connection

Inherits:
Object
  • Object
show all
Defined in:
lib/mysql_replicator/connection.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(host: 'localhost', port: 3306, user: 'root', password: '', database: '') ⇒ Connection

Returns a new instance of Connection.



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# File 'lib/mysql_replicator/connection.rb', line 38

def initialize(host: 'localhost', port: 3306, user: 'root', password: '', database: '')
  @host = host
  @port = port
  @user = user
  @password = password
  @database = database

  @sequence_id = 0
  @connected = false
end

Instance Attribute Details

#database ⇒ Object (readonly)

@rbs! attr_reader host: String @rbs! attr_reader port: Integer @rbs! attr_reader user: String @rbs! attr_reader password: String @rbs! attr_reader database: String



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# File 'lib/mysql_replicator/connection.rb', line 30

def database
  @database
end

#host ⇒ Object (readonly)

@rbs! attr_reader host: String @rbs! attr_reader port: Integer @rbs! attr_reader user: String @rbs! attr_reader password: String @rbs! attr_reader database: String



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# File 'lib/mysql_replicator/connection.rb', line 30

def host
  @host
end

#password ⇒ Object (readonly)

@rbs! attr_reader host: String @rbs! attr_reader port: Integer @rbs! attr_reader user: String @rbs! attr_reader password: String @rbs! attr_reader database: String



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# File 'lib/mysql_replicator/connection.rb', line 30

def password
  @password
end

#port ⇒ Object (readonly)

@rbs! attr_reader host: String @rbs! attr_reader port: Integer @rbs! attr_reader user: String @rbs! attr_reader password: String @rbs! attr_reader database: String



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# File 'lib/mysql_replicator/connection.rb', line 30

def port
  @port
end

#user ⇒ Object (readonly)

@rbs! attr_reader host: String @rbs! attr_reader port: Integer @rbs! attr_reader user: String @rbs! attr_reader password: String @rbs! attr_reader database: String



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# File 'lib/mysql_replicator/connection.rb', line 30

def user
  @user
end

Instance Method Details

#close ⇒ Object 



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# File 'lib/mysql_replicator/connection.rb', line 111

def close
  if !@connected && (@socket.nil? || @socket.closed?)
    MysqlReplicator::Logger.warn 'Connection is not connected'
    return
  end

  reset_sequence_id

  if @connected
    quit_payload = [0x01].pack('C')
    send_packet(quit_payload)
  end

  @socket.close unless @socket.closed?

  @connected = false
  MysqlReplicator::Logger.info "Disconnected to MySQL server at #{@host}:#{@port}"
end

#connect ⇒ Object 



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# File 'lib/mysql_replicator/connection.rb', line 60

def connect
  if @connected
    MysqlReplicator::Logger.warn 'Connection is already connected'
    return
  end

  @socket = TCPSocket.new(@host, @port)
  @socket.setsockopt(Socket::IPPROTO_TCP, Socket::TCP_NODELAY, 1)

  @handshake_info = MysqlReplicator::Connections::Handshake.execute(self)
  MysqlReplicator::Connections::Auth.execute(self, @user, @password, @database, @handshake_info)

  @connected = true
  MysqlReplicator::Logger.info "Connected to MySQL server at #{@host}:#{@port}"
rescue => e
  close
  raise e
end

#connected? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/mysql_replicator/connection.rb', line 55

def connected?
  @connected
end

#connection_id ⇒ Object 



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# File 'lib/mysql_replicator/connection.rb', line 209

def connection_id
  @handshake_info[:connection_id]
end

#dup ⇒ Object 



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# File 'lib/mysql_replicator/connection.rb', line 214

def dup
  new_connection = self.class.new(
    host: @host,
    port: @port,
    user: @user,
    password: @password,
    database: @database
  )
  new_connection.connect
  new_connection
end

#flush_socket_buffer ⇒ Object 



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# File 'lib/mysql_replicator/connection.rb', line 182

def flush_socket_buffer
  return if @socket.nil?

  flushed_data = ''

  begin
    # Read all unread data in non-blocking mode
    while @socket.ready?
      data = @socket.read_nonblock(1024)
      flushed_data += data
      MysqlReplicator::Logger.debug \
        "Found unread data: #{MysqlReplicator::StringUtil.read_array_from_int8(data).map { |b| format('%02X', b) }.join(' ')}"
    end

    sleep 0.1
  rescue IO::WaitReadable
    # Not at all if no data
  rescue => e
    MysqlReplicator::Logger.error "Buffer clear error: #{e.message}"
  end

  return if flushed_data.empty?

  MysqlReplicator::Logger.debug "#{flushed_data.length} bytes of unread data cleared"
end

#ping ⇒ Object 



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# File 'lib/mysql_replicator/connection.rb', line 94

def ping
  unless @connected
    MysqlReplicator::Logger.warn 'Connection is not connected'
    return 'ERROR'
  end

  reset_sequence_id

  ping_payload = [0x0E].pack('C')
  send_packet(ping_payload)

  response = read_packet
  success = MysqlReplicator::StringUtil.read_uint8(response[:payload][0]) == 0x00
  success ? 'PONG' : 'ERROR'
end

#query(sql) ⇒ Object 



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# File 'lib/mysql_replicator/connection.rb', line 81

def query(sql)
  unless @connected
    MysqlReplicator::Logger.warn 'Connection is not connected'
    return
  end

  reset_sequence_id
  flush_socket_buffer

  MysqlReplicator::Connections::Query.execute(self, sql)
end

#read_packet ⇒ Object 



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# File 'lib/mysql_replicator/connection.rb', line 131

def read_packet
  if @socket.nil?
    raise MysqlReplicator::Error, 'TCPSocket is nil'
  end

  header = @socket.read(4)
  if header.nil? || header.length != 4
    raise MysqlReplicator::Error, 'Failed to read packet header'
  end

  # Little-endian 24-bit
  packet_length = MysqlReplicator::StringUtil.read_uint8(header[0]) |
                  (MysqlReplicator::StringUtil.read_uint8(header[1]) << 8) |
                  (MysqlReplicator::StringUtil.read_uint8(header[2]) << 16)
  sequence_id = MysqlReplicator::StringUtil.read_uint8(header[3])

  payload = @socket.read(packet_length)
  if payload.nil? || payload.length != packet_length
    raise MysqlReplicator::Error,
          "Failed to read packet payload: expected #{packet_length} bytes, got #{payload&.length || 0}"
  end

  packet = { length: packet_length, sequence_id: sequence_id, payload: payload }
  MysqlReplicator::Logger.debug "Received packet: #{packet.inspect}"

  # Update to next expected sequence ID
  @sequence_id = (sequence_id + 1) % 256

  {
    length: packet_length,
    sequence_id: sequence_id,
    payload: payload
  }
end

#reset_sequence_id ⇒ Object 



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# File 'lib/mysql_replicator/connection.rb', line 50

def reset_sequence_id
  @sequence_id = 0
end

#send_packet(payload) ⇒ Object 



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# File 'lib/mysql_replicator/connection.rb', line 168

def send_packet(payload)
  if @socket.nil?
    raise MysqlReplicator::Error, 'TCPSocket is nil'
  end

  packet_length = payload.length
  header = ([packet_length].pack('V')[0..2] || '') + [@sequence_id].pack('C').to_s
  @socket.write(header + payload)

  packet = { length: packet_length, sequence_id: @sequence_id, payload: payload }
  MysqlReplicator::Logger.debug "Sent packet: #{packet.inspect}"
end