class MultiThink::Connection

Constants

DEFAULTS

Public Class Methods

new(options = {}) click to toggle source
# File lib/multithink/connection.rb, line 15
def initialize(options = {})
  options = DEFAULTS.merge(options)
  @servers = options.fetch(:servers)
  @retries = options.fetch(:retries)
  @retry_interval = options.fetch(:retry_interval)
  @conn_timeout = options.fetch(:conn_timeout)
  connect
end

Public Instance Methods

connect() click to toggle source
# File lib/multithink/connection.rb, line 24
def connect
  @tried = 0
  while @tried < @retries do
    @servers.each do |server|
      begin
        #TODO(jpg) make timeout configurable
        Timeout::timeout(@conn_timeout) do
          @conn = r.connect(server)
        end
        return true
      rescue
        sleep @retry_interval
      end
      @tried += 1
    end
  end
  # If we got here we couldn't get a connection. :(
  raise "Error: Reached maximum retries (#{@retries})"
end
is_connection_error(e) click to toggle source
# File lib/multithink/connection.rb, line 54
def is_connection_error(e)
  case e
  when Errno::ECONNREFUSED, Errno::EHOSTUNREACH, Errno::EPIPE,
    Errno::ECONNRESET, Errno::ETIMEDOUT, IOError
    true
  when RethinkDB::RqlRuntimeError
    e.message =~ /cannot perform (read|write): No master available/ ||
    e.message =~ /Error: Connection Closed/
  else
    false
  end
end
reconnect() click to toggle source
# File lib/multithink/connection.rb, line 67
def reconnect
  begin
    # try fast path first
    @conn.reconnect
  rescue
    # if that fails then try get a new connection
    connect
  end
end
run(query, *args) click to toggle source
# File lib/multithink/connection.rb, line 44
def run(query, *args)
  begin
    query.run(@conn, *args)
  rescue StandardError => e
    if is_connection_error(e)
      retry if reconnect
    end
  end
end