Module: Sparrow::Server

Includes:
Miscel
Defined in:
lib/sparrow/server.rb

Defined Under Namespace

Classes: ClientError, InvalidBodyLength, NoMoreMessages, StatementInvalid

Constant Summary collapse

CR = 
"\r\n"
ERROR = 
"ERROR"
OK = 
"OK"
EOF = 
"END"
CLIENT_ERROR = 
"CLIENT_ERROR"
SERVER_ERROR = 
"SERVER_ERROR"
STORED = 
"STORED"
NOT_STORED = 
"NOT_STORED"
DELETED = 
"DELETED"
NOT_FOUND = 
"NOT_FOUND"
VALUE = 
"VALUE"
VERSION = 
"VERSION"
STATS = 
"STATS"
SET_REGEX = 
/\ASET\s/i
ADD_REGEX = 
/\AADD\s/i
REPLACE_REGEX = 
/\AREPLACE\s/i
DELETE_REGEX = 
/\ADELETE\s/i
GET_REGEX = 
/\AGET\s/i
QUIT_REGEX = 
/\AQUIT/i
FLUSH_ALL_REGEX = 
/\AFLUSH_ALL/i
VERSION_REGEX = 
/\AVERSION/i
STATS_REGEX = 
/\ASTATS/i

Instance Method Summary collapse

Methods included from Miscel

#base_dir, #log_path, #logger, #options, #options=, #pid_dir

Instance Method Details

#delete_command ⇒ Object

DELETE 



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# File 'lib/sparrow/server.rb', line 200

def delete_command
  if Sparrow::Queue.delete(!args[1])
    logger.info "Deleting queue - #{args[1]}"
    publish DELETED
  else
    publish NOT_FOUND
  end
end

#flush_all_command ⇒ Object

FLUSH_ALL



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# File 'lib/sparrow/server.rb', line 228

def flush_all_command
  logger.info "Flushing all queues"
  Sparrow::Queue.delete_all
  publish OK
end

#get_command ⇒ Object

GET *r\n

Raises:



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# File 'lib/sparrow/server.rb', line 175

def get_command
  args.shift # get rid of the command
  raise ClientError if args.empty?
  rsp = []
  args.each do |queue|
    logger.debug "Getting message from queue - #{queue}"
    begin
      msg = Sparrow::Queue.next_message(queue)
      next unless msg
    rescue NoMoreMessages
      next
    end
    flag = msg[-1..-1]
    msg = msg[0..-2]
    rsp << [VALUE, queue, flag, msg.length].join(' ')
    rsp << msg
    self.get_count += 1
  end
  rsp << EOF
  send_data(rsp.join(CR) + CR)
end

#post_init ⇒ Object 



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# File 'lib/sparrow/server.rb', line 62

def post_init
  @current_queue = nil
  @expecting_body = false
  @expected_bytes = 0
  @current_flag = nil
  @buffer = ''
  self.connections_made += 1
  logger.debug "New client [#{client_ip}]"
end

#process_body ⇒ Object 



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# File 'lib/sparrow/server.rb', line 158

def process_body
  if @data.length != @expected_bytes
   raise InvalidBodyLength
  end
  @data << @current_flag
  logger.debug "Adding message to queue - #{@current_queue}"
  Sparrow::Queue.add_message(@current_queue, @data)
  self.set_count += 1
  @expected_bytes = 0
  @current_queue = nil
  @expecting_body = false
  publish STORED
end

#process_message(ln) ⇒ Object 



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# File 'lib/sparrow/server.rb', line 104

def process_message ln
  @data = ln
  if ln =~ SET_REGEX
    set_command
  elsif ln =~ ADD_REGEX
    add_command
  elsif ln =~ REPLACE_REGEX
    replace_command
  elsif ln =~ GET_REGEX
    get_command
  elsif ln =~ DELETE_REGEX
    delete_command
  elsif ln =~ QUIT_REGEX
    quit_command
  elsif ln =~ VERSION_REGEX
    version_command
  elsif ln =~ FLUSH_ALL_REGEX
    flush_all_command
  elsif ln =~ STATS_REGEX
    stats_command
  elsif @expecting_body
    process_body
  else
    raise StatementInvalid
  end
  @data = nil
  @split_args = nil

rescue ClientError => e
  logger.error e
  publish CLIENT_ERROR, e
  publish ERROR
rescue => e
  logger.error e
  publish SERVER_ERROR, e
end

#process_whole_messages(data) ⇒ Object

 process any whole messages in the buffer, and return the new contents of the buffer



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# File 'lib/sparrow/server.rb', line 91

def process_whole_messages(data)
  return data if data !~ /\r\n/i # only process if data contains a CR
  messages = data.split(CR)
  if data =~ /\r\n$/i
    data = ''
  else
    # remove the last message from the list (because it is incomplete) before processing
    data = messages.pop
  end
  messages.each {|message| process_message(message) }
  return data
end

#publish(*args) ⇒ Object 



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# File 'lib/sparrow/server.rb', line 141

def publish *args
  send_data args.join(' ') + CR
end

#quit_command ⇒ Object

QUIT



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# File 'lib/sparrow/server.rb', line 240

def quit_command
  logger.debug "Closing connection"
  close_connection
end

#receive_data(data) ⇒ Object 



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# File 'lib/sparrow/server.rb', line 82

def receive_data(data)
  logger.debug "Receiving data: #{data}"
  self.bytes_read += 1
  @buffer << data
  @buffer = process_whole_messages(@buffer)
end

#send_data(data) ⇒ Object 



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# File 'lib/sparrow/server.rb', line 77

def send_data(data)
  self.bytes_written += 1
  super(data)
end

#set_command ⇒ Object Also known as: add_command, replace_command

\r\n

Raises:



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# File 'lib/sparrow/server.rb', line 148

def set_command
  @current_queue = args[1]
  @current_flag = args[2] || 0
  raise ClientError unless @current_queue
  @expected_bytes = args[4].to_i || 0
  @expecting_body = true
end

#stats_command ⇒ Object 



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# File 'lib/sparrow/server.rb', line 209

def stats_command
  rsp = []
  stats_hash = Sparrow::Queue.get_stats(args[1])
  stats_hash.merge!({
    :curr_connections   => (self.connections_made - self.connections_lost),
    :total_connections  => self.connections_made,
    :bytes_read         => self.bytes_read,
    :bytes_written      => self.bytes_written,
    :get_count          => self.get_count,
    :set_count          => self.set_count
  })
  stats_hash.each do |key, value|
    rsp << [STATS, key, value].join(' ')
  end
  rsp << EOF
  send_data(rsp.join(CR) + CR)
end

#unbind ⇒ Object 



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# File 'lib/sparrow/server.rb', line 72

def unbind
  self.connections_lost += 1
  logger.debug "Lost client"
end

#version_command ⇒ Object

VERSION



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# File 'lib/sparrow/server.rb', line 235

def version_command
  publish VERSION, Sparrow::Version
end