Pb协议的接口测试

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Protocol Buffers 是谷歌开源的序列化与反序列化框架。它与语言无关、平台无关、具有可扩展的机制。用于序列化结构化数据，此工具对标 XML ，支持自动编码，解码。比 XML 性能好，且数据易于解析。更多有关工具的介绍可参考官网。

Protocol Buffers官网：https://developers.google.com/protocol-buffers

Protocol Buffers 为跨平台设计，以 Python 为例，使用者配置 .proto 文件，利用 Protocol Buffers 工具即可生成 Python 代码，此代码就是使用者想要的数据结构。

如果编程语言换成了 Java ，使用者可使用相同的 .proto 文件，利用 Protocol Buffers 工具生成 Java 代码，此代码可被 Java 进行解析。

这么做的好处是可以跨语言交流，试想 Java 与 Python 间的数据通信，只需要利用 .proto 确定格式，就可随心编程，这个过程惬意无比。基于 Protocol Buffers 的测试也无比舒服。

你可选择自己的语言进行测试，比如 Python 。由于数据格式基于 .proto 配置文件，获取到这个文件即可生成数据类，比如下述 .proto 内容通过 protoc --python_out=./ ./addressbook.proto 命令即可生成 addressbook_pb2.py 文件：

syntax = "proto2";

package tutorial;

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

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

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

  repeated PhoneNumber phones = 4;
}

message AddressBook {
  repeated Person people = 1;
}

测试人员的代码只需导入 addressbook_pb2 ，对其初始化后即可使用，比如对 Person 的字段加入一些测试值：

import addressbook_pb2
person = addressbook_pb2.Person()
person.id = 1234
person.name = "John Doe"
person.email = "[email protected]"
phone = person.phones.add()
phone.number = "555-4321"
phone.type = addressbook_pb2.Person.HOME

最后，将 person 序列化后即可传输到被测对象。如果你的业务采用文件进行数据传输，可参考官方写文件的例子（采用 python2 ）：

#! /usr/bin/python

import addressbook_pb2
import sys

# This function fills in a Person message based on user input.
def PromptForAddress(person):
  person.id = int(raw_input("Enter person ID number: "))
  person.name = raw_input("Enter name: ")

  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.phones.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.PhoneType.MOBILE
    elif type == "home":
      phone_number.type = addressbook_pb2.Person.PhoneType.HOME
    elif type == "work":
      phone_number.type = addressbook_pb2.Person.PhoneType.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.people.add())

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

也可从被测对象传来的文件中读数据：

#! /usr/bin/python

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.people:
    print "Person ID:", person.id
    print "  Name:", person.name
    if person.HasField('email'):
      print "  E-mail address:", person.email

    for phone_number in person.phones:
      if phone_number.type == addressbook_pb2.Person.PhoneType.MOBILE:
        print "  Mobile phone #: ",
      elif phone_number.type == addressbook_pb2.Person.PhoneType.HOME:
        print "  Home phone #: ",
      elif phone_number.type == addressbook_pb2.Person.PhoneType.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)

如果数据通过 https 传输，可采用 requests ，其它传输方式同理，请自行查阅数据传输工具。如果测试人员代码与被测对象建立了联系，即可收发测试数据，测试人员对接收到的数据编写测试用例即可。

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