Class: EventMachine::Hiredis::BaseClient

Inherits:
Object
  • Object
show all
Defined in:
lib/em-synchrony/em-hiredis.rb

Class Method Summary collapse

Instance Method Summary collapse

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(sym, *args) ⇒ Object 



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# File 'lib/em-synchrony/em-hiredis.rb', line 112

def method_missing(sym, *args)
  EM::Synchrony.sync old_method_missing(sym, *args)
end

Class Method Details

.connect(host = 'localhost', port = 6379) ⇒ Object 



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# File 'lib/em-synchrony/em-hiredis.rb', line 27

def self.connect(host = 'localhost', port = 6379)
  conn = new(host, port)
  EM::Synchrony.sync conn.connect
  conn
end

Instance Method Details

#connect ⇒ Object 



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# File 'lib/em-synchrony/em-hiredis.rb', line 33

def connect
  @auto_reconnect = true
  @connection = EM.connect(@host, @port, Connection, @host, @port)
  
  @connection.on(:closed) do
    if @connected
      @defs.each { |d| d.fail(Error.new("Redis disconnected")) }
      @defs = []
      @deferred_status = nil
      @connected = false
      if @auto_reconnect
        # Next tick avoids reconnecting after for example EM.stop
        EM.next_tick { reconnect }
      end
      emit(:disconnected)
      EM::Hiredis.logger.info("#{@connection} Disconnected")
    else
      if @auto_reconnect
        @reconnect_failed_count += 1
        @reconnect_timer = EM.add_timer(EM::Hiredis.reconnect_timeout) {
          @reconnect_timer = nil
          reconnect
        }
        emit(:reconnect_failed, @reconnect_failed_count)
        EM::Hiredis.logger.info("#{@connection} Reconnect failed")
        
        if @reconnect_failed_count >= 4
          emit(:failed)
          self.fail(Error.new("Could not connect after 4 attempts"))
        end
      end
    end
  end
  
  @connection.on(:connected) do
    Fiber.new do
      @connected = true
      @reconnect_failed_count = 0
      @failed = false
      
      select(@db) unless @db == 0
      auth(@password) if @password
      
      @command_queue.each do |df, command, args|
        @connection.send_command(command, args)
        @defs.push(df)
      end
      @command_queue = []
      
      emit(:connected)
      EM::Hiredis.logger.info("#{@connection} Connected")
      succeed
      
      if @reconnecting
        @reconnecting = false
        emit(:reconnected)
      end
    end.resume
  end
  
  @connection.on(:message) do |reply|
    if RuntimeError === reply
      raise "Replies out of sync: #{reply.inspect}" if @defs.empty?
      deferred = @defs.shift
      error = RedisError.new(reply.message)
      error.redis_error = reply
      deferred.fail(error) if deferred
    else
      handle_reply(reply)
    end
  end
  
  @connected = false
  @reconnecting = false
  
  return self
end

#old_method_missing ⇒ Object 



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# File 'lib/em-synchrony/em-hiredis.rb', line 111

alias :old_method_missing :method_missing