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module Celluloid
module ZMQ
class Socket
# Create a new socket
def initialize(type)
@socket = Celluloid::ZMQ.context.socket ::ZMQ.const_get(type.to_s.upcase)
@linger = 0
end
attr_reader :linger
# Connect to the given 0MQ address
# Address should be in the form: tcp://1.2.3.4:5678/
def connect(addr)
unless ::ZMQ::Util.resultcode_ok? @socket.connect addr
raise IOError, "error connecting to #{addr}: #{::ZMQ::Util.error_string}"
end
true
end
def linger=(value)
@linger = value || -1
unless ::ZMQ::Util.resultcode_ok? @socket.setsockopt(::ZMQ::LINGER, value)
raise IOError, "couldn't set linger: #{::ZMQ::Util.error_string}"
end
end
def identity=(value)
@socket.identity = value
end
def identity
@socket.identity
end
def set(option, value, length = nil)
unless ::ZMQ::Util.resultcode_ok? @socket.setsockopt(option, value, length)
raise IOError, "couldn't set value for option #{option}: #{::ZMQ::Util.error_string}"
end
end
def get(option)
option_value = []
unless ::ZMQ::Util.resultcode_ok? @socket.getsockopt(option, option_value)
raise IOError, "couldn't get value for option #{option}: #{::ZMQ::Util.error_string}"
end
option_value[0]
end
# Bind to the given 0MQ address
# Address should be in the form: tcp://1.2.3.4:5678/
def bind(addr)
unless ::ZMQ::Util.resultcode_ok? @socket.bind(addr)
raise IOError, "couldn't bind to #{addr}: #{::ZMQ::Util.error_string}"
end
end
# Close the socket
def close
@socket.close
end
# Hide ffi-rzmq internals
alias_method :inspect, :to_s
end
# Readable 0MQ sockets have a read method
module ReadableSocket
extend Forwardable
# always set LINGER on readable sockets
def bind(addr)
self.linger = @linger
super(addr)
end
def connect(addr)
self.linger = @linger
super(addr)
end
# Read a message from the socket
def read(buffer = '')
ZMQ.wait_readable(@socket) if ZMQ.evented?
unless ::ZMQ::Util.resultcode_ok? @socket.recv_string buffer
raise IOError, "error receiving ZMQ string: #{::ZMQ::Util.error_string}"
end
buffer
end
# Multiparts message ?
def_delegator :@socket, :more_parts?
# Reads a multipart message, stores it into the given buffer and returns
# the buffer.
def read_multipart(buffer = [])
ZMQ.wait_readable(@socket) if ZMQ.evented?
unless ::ZMQ::Util.resultcode_ok? @socket.recv_strings buffer
raise IOError, "error receiving ZMQ string: #{::ZMQ::Util.error_string}"
end
buffer
end
end
# Writable 0MQ sockets have a send method
module WritableSocket
# Send a message to the socket
def write(*messages)
unless ::ZMQ::Util.resultcode_ok? @socket.send_strings messages.flatten
raise IOError, "error sending 0MQ message: #{::ZMQ::Util.error_string}"
end
messages
end
alias_method :<<, :write
alias_method :send, :write # deprecated
end
# ReqSockets are the counterpart of RepSockets (REQ/REP)
class ReqSocket < Socket
include ReadableSocket
include WritableSocket
def initialize
super :req
end
end
# RepSockets are the counterpart of ReqSockets (REQ/REP)
class RepSocket < Socket
include ReadableSocket
include WritableSocket
def initialize
super :rep
end
end
# DealerSockets are like ReqSockets but more flexible
class DealerSocket < Socket
include ReadableSocket
include WritableSocket
def initialize
super :dealer
end
end
# RouterSockets are like RepSockets but more flexible
class RouterSocket < Socket
include ReadableSocket
include WritableSocket
def initialize
super :router
end
end
# PushSockets are the counterpart of PullSockets (PUSH/PULL)
class PushSocket < Socket
include WritableSocket
def initialize
super :push
end
end
# PullSockets are the counterpart of PushSockets (PUSH/PULL)
class PullSocket < Socket
include ReadableSocket
def initialize
super :pull
end
end
# PubSockets are the counterpart of SubSockets (PUB/SUB)
class PubSocket < Socket
include WritableSocket
def initialize
super :pub
end
end
# XPubSockets are just like PubSockets but reading from them gives you the
# subscription/unsubscription channels as they're joined/left.
class XPubSocket < Socket
include WritableSocket
include ReadableSocket
def initialize
super :xpub
end
end
# SubSockets are the counterpart of PubSockets (PUB/SUB)
class SubSocket < Socket
include ReadableSocket
def initialize
super :sub
end
def subscribe(topic)
unless ::ZMQ::Util.resultcode_ok? @socket.setsockopt(::ZMQ::SUBSCRIBE, topic)
raise IOError, "couldn't set subscribe: #{::ZMQ::Util.error_string}"
end
end
def unsubscribe(topic)
unless ::ZMQ::Util.resultcode_ok? @socket.setsockopt(::ZMQ::UNSUBSCRIBE, topic)
raise IOError, "couldn't set unsubscribe: #{::ZMQ::Util.error_string}"
end
end
end
end
end
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