Class: Estore::Connection::Buffer

Inherits:
Object
  • Object
show all
Defined in:
lib/estore/connection/buffer.rb

Overview

Buffer receives data from the TCP connection, and parses the binary packages. Parsed packages are given back to the given handler as they are decoded.

Instance Method Summary collapse

Constructor Details

#initialize(&block) ⇒ Buffer

Returns a new instance of Buffer.



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# File 'lib/estore/connection/buffer.rb', line 7

def initialize(&block)
  @mutex = Mutex.new
  @buffer = ''.force_encoding('BINARY')
  @handler = block
end

Instance Method Details

#<<(bytes) ⇒ Object 



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# File 'lib/estore/connection/buffer.rb', line 13

def <<(bytes)
  bytes = bytes.force_encoding('BINARY') if
    bytes.respond_to? :force_encoding

  @mutex.synchronize do
    @buffer << bytes
  end

  consume_packages
end

#consume_packages ⇒ Object 



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# File 'lib/estore/connection/buffer.rb', line 24

def consume_packages
  while (pkg = read_package)
    handle(pkg)
    discard_bytes(pkg)
  end
end

#discard_bytes(pkg) ⇒ Object 



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# File 'lib/estore/connection/buffer.rb', line 38

def discard_bytes(pkg)
  @mutex.synchronize do
    @buffer = @buffer[(4 + pkg.bytesize)..-1]
  end
end

#handle(pkg) ⇒ Object 



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# File 'lib/estore/connection/buffer.rb', line 44

def handle(pkg)
  code, flags, uuid_bytes, package = parse(pkg)
  command = Estore::Connection.command_name(code)
  @handler.call(command, package, Package.parse_uuid(uuid_bytes), flags)
end

#parse(pkg) ⇒ Object 



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# File 'lib/estore/connection/buffer.rb', line 50

def parse(pkg)
  [
    pkg[0].unpack('C').first,
    pkg[1].unpack('C').first,
    pkg[2...(2 + 16)],
    pkg[18..-1]
  ]
end

#read_package ⇒ Object 



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# File 'lib/estore/connection/buffer.rb', line 31

def read_package
  return nil if @buffer.length < 4
  package_length = @buffer[0...4].unpack('l<').first
  bytes = @buffer[4...(4 + package_length)].dup
  bytes if bytes.bytesize >= package_length
end