protocol-buffer

addressbook.proto

package tutorial;

message Person {
  required string name = 1;
  required int32 id = 2;
  optional string email = 3;

  enum PhoneType {
    MOBILE = 0;
    HOME = 1;
    WORK = 2;
  }

  message PhoneNumber {
    required string number = 1;
    optional PhoneType type = 2 [default = HOME];
  }

  repeated PhoneNumber phone = 4;
}

message AddressBook {
  repeated Person person = 1;
}

basics.md

tutorial

• https://developers.google.com/protocol-buffers/docs/pythontutorial?hl=ko
  • writer.py 한글 사용을 위해 person.name 입력 시 unicode 사용
  • reader.py, addressbook.proto 그대로 사용

  $ protoc -I=./ --python_out=./ ./addressbook.proto
  $ python writer.py addressbook.file
  $ python2.7 reader.py addressbook.file
  Person ID: 1
    Name: haha
    E-mail address: seoul
    Mobile phone #:  123
    Home phone #:  234
    Work phone #:  333
  ...
  

installation

• 최신은 현재 2.6.1이나 CentOS 6.3에서 yum으로 기본 설치되는 건 2.3.0
  • yum install protobuf-devel python-protobuf

reader.py

# -*- coding: utf8 -*-

import addressbook_pb2
import sys


# Iterates though all people in the AddressBook and prints info about them.
def ListPeople(address_book):
  for person in address_book.person:
    print "Person ID:", person.id
    print "  Name:", person.name
    if person.HasField('email'):
      print "  E-mail address:", person.email

    for phone_number in person.phone:
      if phone_number.type == addressbook_pb2.Person.MOBILE:
        print "  Mobile phone #: ",
      elif phone_number.type == addressbook_pb2.Person.HOME:
        print "  Home phone #: ",
      elif phone_number.type == addressbook_pb2.Person.WORK:
        print "  Work phone #: ",
      print phone_number.number

# Main procedure:  Reads the entire address book from a file and prints all
#   the information inside.
if len(sys.argv) != 2:
  print "Usage:", sys.argv[0], "ADDRESS_BOOK_FILE"
  sys.exit(-1)

address_book = addressbook_pb2.AddressBook()

# Read the existing address book.
f = open(sys.argv[1], "rb")
address_book.ParseFromString(f.read())
f.close()

ListPeople(address_book)

writer.py

# -*- coding: utf8 -*-

import addressbook_pb2
import sys


# This function fills in a Person message based on user input.
def PromptForAddress(person, id=None, name=None, email=None):
  if id is None:
    person.id = int(raw_input("Enter person ID number: "))
  else:
    person.id = id
  if name is None:
    person.name = unicode(raw_input("Enter name: "))
  else:
    person.name = name

  if email is None:
    email = raw_input("Enter email address (blank for none): ")
  if email != "":
    person.email = email

  '''while True:
    number = raw_input("Enter a phone number (or leave blank to finish): ")
    if number == "":
      break

    phone_number = person.phone.add()
    phone_number.number = number

    type = raw_input("Is this a mobile, home, or work phone? ")
    if type == "mobile":
      phone_number.type = addressbook_pb2.Person.MOBILE
    elif type == "home":
      phone_number.type = addressbook_pb2.Person.HOME
    elif type == "work":
      phone_number.type = addressbook_pb2.Person.WORK
    else:
      print "Unknown phone type; leaving as default value."'''

# Main procedure:  Reads the entire address book from a file,
#   adds one person based on user input, then writes it back out to the same
#   file.
if len(sys.argv) != 2:
  print "Usage:", sys.argv[0], "ADDRESS_BOOK_FILE"
  sys.exit(-1)

address_book = addressbook_pb2.AddressBook()

# Read the existing address book.
try:
  f = open(sys.argv[1], "rb")
  address_book.ParseFromString(f.read())
  f.close()
except IOError:
  print sys.argv[1] + ": Could not open file.  Creating a new one."

# Add an address.
PromptForAddress(address_book.person.add(), 555, u'하하하', 'a@bb.cc')

# Write the new address book back to disk.
f = open(sys.argv[1], "wb")
f.write(address_book.SerializeToString())
f.close()