Class: GitDB::Protocol

Inherits:

Object

• Object
• GitDB::Protocol

show all

Defined in:

lib/git-db/protocol.rb

Instance Attribute Summary (collapse)

• - (Object) reader readonly

  Returns the value of attribute reader.

• - (Object) writer readonly

  Returns the value of attribute writer.

Instance Method Summary (collapse)

• - (Object) flush

  commands ##################################################################.

• - (Protocol) initialize(io = nil) constructor

  A new instance of Protocol.

• - (Object) read_command
• - (Object) read_pack

  packs #####################################################################.

• - (Object) write(data)
• - (Object) write_command(command)
• - (Object) write_eof
• - (Object) write_pack(entries)

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# File 'lib/git-db/protocol.rb', line 6

def initialize(io=nil)
  if io
    @reader = io
    @writer = io
  else
    @reader = STDIN
    @writer = STDOUT
  end
end

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# File 'lib/git-db/protocol.rb', line 3

def reader
  @reader
end

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# File 'lib/git-db/protocol.rb', line 4

def writer
  @writer
end

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# File 'lib/git-db/protocol.rb', line 18

def flush
  writer.flush
end

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# File 'lib/git-db/protocol.rb', line 22

def read_command
  # length is stored in the first 4 bytes
  length = reader.read(4)
  return nil unless length

  # length is stored as hex, convert back to decimal and return if it's 0
  length = length.to_i(16)
  return if length.zero?

  # length includes the 4 bytes of the length itself, subtract for data
  length -= 4

  # read and return the data
  data = reader.read(length)
  GitDB.log("RECEIVED COMMAND: #{data.inspect}")
  data
end

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# File 'lib/git-db/protocol.rb', line 62

def read_pack
  GitDB::Pack.new(reader).read
end

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# File 'lib/git-db/protocol.rb', line 50

def write(data)
  writer.write data
  writer.flush
end

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# File 'lib/git-db/protocol.rb', line 40

def write_command(command)
  # output the length
  writer.print length_as_hex(command)

  # output the data
  GitDB.log("SENDING COMMAND: #{command.inspect}")
  writer.print command
  writer.flush
end

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# File 'lib/git-db/protocol.rb', line 55

def write_eof
  writer.print '0000'
  writer.flush
end

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# File 'lib/git-db/protocol.rb', line 66

def write_pack(entries)
  GitDB::Pack.new(writer).write(entries)
end