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Implement Cool.io backend for Droonga protocol
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lib/droonga/client/connection/droonga-protocol/coolio.rb
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| # Copyright (C) 2014 Droonga Project | ||
| # | ||
| # This library is free software; you can redistribute it and/or | ||
| # modify it under the terms of the GNU Lesser General Public | ||
| # License version 2.1 as published by the Free Software Foundation. | ||
| # | ||
| # This library is distributed in the hope that it will be useful, | ||
| # but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
| # Lesser General Public License for more details. | ||
| # | ||
| # You should have received a copy of the GNU Lesser General Public | ||
| # License along with this library; if not, write to the Free Software | ||
| # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | ||
|
|
||
| require "coolio" | ||
| require "droonga/message-pack-packer" | ||
|
|
||
| module Droonga | ||
| class Client | ||
| module Connection | ||
| class DroongaProtocol | ||
| class Coolio | ||
| class Request | ||
| def initialize(receiver, id, loop) | ||
| @receiver = receiver | ||
| @id = id | ||
| @loop = loop | ||
| end | ||
|
|
||
| def wait | ||
| return if @receiver.received?(@id) | ||
| until @receiver.received?(@id) | ||
| @loop.run_once | ||
| end | ||
| end | ||
| end | ||
|
|
||
| class InfiniteRequest | ||
| def initialize(loop) | ||
| @loop = loop | ||
| end | ||
|
|
||
| def wait | ||
| @loop.run | ||
| end | ||
| end | ||
|
|
||
| class Sender < ::Coolio::TCPSocket | ||
| def initialize(socket) | ||
| super(socket) | ||
| end | ||
|
|
||
| def send(tag, data) | ||
| fluent_message = [tag, Time.now.to_i, data] | ||
| packed_fluent_message = MessagePackPacker.pack(fluent_message) | ||
| write(packed_fluent_message) | ||
| end | ||
| end | ||
|
|
||
| class Receiver < ::Coolio::TCPServer | ||
| def initialize(*args) | ||
| super(*args) do |engine| | ||
| @engines << engine | ||
| handle_engine(engine) | ||
| end | ||
| @requests = {} | ||
| @engines = [] | ||
| end | ||
|
|
||
| def close | ||
| super | ||
| @engines.each do |engine| | ||
| engine.close | ||
| end | ||
| @engines.clear | ||
| end | ||
|
|
||
| def host | ||
| @listen_socket.addr[3] | ||
| end | ||
|
|
||
| def port | ||
| @listen_socket.addr[1] | ||
| end | ||
|
|
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| def droonga_name | ||
| "#{host}:#{port}/droonga" | ||
| end | ||
|
|
||
| def register(id, &callback) | ||
| @requests[id] = { | ||
| :received => false, | ||
| :callback => callback, | ||
| } | ||
| end | ||
|
|
||
| def unregister(id) | ||
| @requests.delete(id) | ||
| end | ||
|
|
||
| def received?(id) | ||
| if @requests.key?(id) | ||
| @requests[id][:received] | ||
| else | ||
| true | ||
| end | ||
| end | ||
|
|
||
| private | ||
| def handle_engine(engine) | ||
| unpacker = MessagePack::Unpacker.new | ||
| on_read = lambda do |data| | ||
| unpacker.feed_each(data) do |fluent_message| | ||
| tag, time, droonga_message = fluent_message | ||
| id = droonga_message["inReplyTo"] | ||
| request = @requests[id] | ||
| next if request.nil? | ||
| request[:received] = true | ||
| request[:callback].call(fluent_message) | ||
| end | ||
| end | ||
| engine.on_read do |data| | ||
| on_read.call(data) | ||
| end | ||
|
|
||
| on_close = lambda do | ||
| @engines.delete(engine) | ||
| end | ||
| engine.on_close do | ||
| on_close.call | ||
| end | ||
| end | ||
| end | ||
|
|
||
| def initialize(host, port, tag, options={}) | ||
| @host = host | ||
| @port = port | ||
| @tag = tag | ||
| default_options = { | ||
| } | ||
| @options = default_options.merge(options) | ||
| @loop = options[:loop] || ::Coolio::Loop.default | ||
|
|
||
| @sender = Sender.connect(@host, @port) | ||
| @sender.attach(@loop) | ||
| @receiver_host = @options[:receiver_host] || Socket.gethostname | ||
| @receiver_port = @options[:receiver_port] || 0 | ||
| @receiver = Receiver.new(@receiver_host, @receiver_port) | ||
| @receiver.attach(@loop) | ||
| end | ||
|
|
||
| def request(message, options={}, &block) | ||
| id = message["id"] || generate_id | ||
| message = message.merge("id" => id, | ||
| "replyTo" => @receiver.droonga_name) | ||
| send(message, options) | ||
|
|
||
| sync = block.nil? | ||
| if sync | ||
| response = nil | ||
| block = lambda do |_response| | ||
| response = _response | ||
| end | ||
| end | ||
| @receiver.register(id) do | ||
| @receiver.unregister(id) | ||
| block.call | ||
| end | ||
| request = Request.new(@receiver, id, @loop) | ||
| if sync | ||
| request.wait | ||
| response | ||
| else | ||
| request | ||
| end | ||
| end | ||
|
|
||
| def subscribe(message, options={}, &block) | ||
| id = message["id"] || generate_id | ||
| message = message.merge("id" => id, | ||
| "from" => @receiver.droonga_name) | ||
| send(message, options) | ||
|
|
||
| request = InfiniteRequest.new(@loop) | ||
| sync = block.nil? | ||
| if sync | ||
| yielder = nil | ||
| buffer = [] | ||
| @receiver.register(id) do |response| | ||
| if yielder | ||
| while (old_response = buffer.shift) | ||
| yielder << old_response | ||
| end | ||
| yielder << response | ||
| else | ||
| buffer << response | ||
| end | ||
| end | ||
| Enumerator.new do |_yielder| | ||
| yielder = _yielder | ||
| request.wait | ||
| end | ||
| else | ||
| @receiver.register(id, &block) | ||
| request | ||
| end | ||
| end | ||
|
|
||
| def send(message, options={}, &block) | ||
| if message["id"].nil? or message["date"].nil? | ||
| id = message["id"] || generate_id | ||
| date = message["date"] || Time.now | ||
| message = message.merge("id" => id, "date" => date) | ||
| end | ||
| @sender.send("#{@tag}.message", message) | ||
| end | ||
|
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||
| def close | ||
| @sender.close | ||
| @receiver.close | ||
| end | ||
|
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||
| private | ||
| def generate_id | ||
| Time.now.to_f.to_s | ||
| end | ||
| end | ||
| end | ||
| end | ||
| end | ||
| end |