HttpRunner3源码阅读：4. loader项目路径加载，用例文件转换方法字典生成
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loader.py
这个文件中主要是对yaml,json用例加载转换成用例处理, 预置函数加载成方法字典，路径加载等
可用资料
[importlib]. https://docs.python.org/zh-cn/3/library/importlib.html
[funcitons]. https://docs.python.org/zh-cn/3/library/functions.html
借助impotlib 动态导入module， vars内置函数解析module中的信息，并将其处理和加入方法字典中name 作为 key， 函数对象作为value，来完成调用扩展函数的上半部分内容
导包
import csv # 内置库：csv 读取
import importlib # 内置库 处理动态导包得
import json # 内置库 json 处理
import os # 内置库 操作系统
import sys # 内置库 系统相关的参数和函数
import types # 内置库 动态类型创建和内置类型名称
from typing import Tuple, Dict, Union, Text, List, Callable
import yaml # 处理yaml文件 pyyaml
from loguru import logger
from pydantic import ValidationError # 异常
from httprunner import builtin, utils # builtin 中存在预置的函数
from httprunner import exceptions # 自定义的失败，错误逻辑
from httprunner.models import TestCase, ProjectMeta, TestSuite
源码附注释
# pyyaml 异常处理
try:
# PyYAML version >= 5.1
# ref: https://github.com/yaml/pyyaml/wiki/PyYAML-yaml.load(input)-Deprecation
yaml.warnings({"YAMLLoadWarning": False})
except AttributeError:
pass
# project_meta 信息为None
project_meta: Union[ProjectMeta, None] = None
# _命名规范表示不想对外暴露
# 读取yaml文件转成字典/JSON
def _load_yaml_file(yaml_file: Text) -> Dict:
""" load yaml file and check file content format
"""
with open(yaml_file, mode="rb") as stream:
try:
yaml_content = yaml.load(stream)
except yaml.YAMLError as ex:
err_msg = f"YAMLError:\\nfile: {yaml_file}\\nerror: {ex}"
logger.error(err_msg)
raise exceptions.FileFormatError
return yaml_content
# json文件转成 DICT
def _load_json_file(json_file: Text) -> Dict:
""" load json file and check file content format
"""
with open(json_file, mode="rb") as data_file:
try:
json_content = json.load(data_file)
except json.JSONDecodeError as ex:
err_msg = f"JSONDecodeError:\\nfile: {json_file}\\nerror: {ex}"
raise exceptions.FileFormatError(err_msg)
return json_content
# 根据文件路径把用例文件，转成字典
def load_test_file(test_file: Text) -> Dict:
"""load testcase/testsuite file content"""
if not os.path.isfile(test_file):
raise exceptions.FileNotFound(f"test file not exists: {test_file}")
# os.path.splitext(test_file) 获取路径中文件后缀转换小写
file_suffix = os.path.splitext(test_file)[1].lower()
if file_suffix == ".json":
test_file_content = _load_json_file(test_file)
elif file_suffix in [".yaml", ".yml"]:
test_file_content = _load_yaml_file(test_file)
else:
# \'\' or other suffix
raise exceptions.FileFormatError(
f"testcase/testsuite file should be YAML/JSON format, invalid format file: {test_file}"
)
return test_file_content
# 将字典转成 TestCase对象
def load_testcase(testcase: Dict) -> TestCase:
try:
# validate with pydantic TestCase model
testcase_obj = TestCase.parse_obj(testcase)
# 当成实例化操作就行 TestCase.parse_obj(testcase)
# TestCase(**testcase) 和上面等效
except ValidationError as ex:
err_msg = f"TestCase ValidationError:\\nerror: {ex}\\ncontent: {testcase}"
raise exceptions.TestCaseFormatError(err_msg)
return testcase_obj
# 将测试用例文件转成TestCase对象
def load_testcase_file(testcase_file: Text) -> TestCase:
"""load testcase file and validate with pydantic model"""
# 1. 测试用例文件路径转成字典
testcase_content = load_test_file(testcase_file)
# 2. 字典转成 TestCase 对象
testcase_obj = load_testcase(testcase_content)
# 3. 将文件路径赋值给 对象里面的config下的path
testcase_obj.config.path = testcase_file
# 4. 返回TestCase对象
return testcase_obj
# 测试套件，将套件字典 加载成TestSuite对象
def load_testsuite(testsuite: Dict) -> TestSuite:
path = testsuite["config"]["path"]
try:
# validate with pydantic TestCase model
testsuite_obj = TestSuite.parse_obj(testsuite)
except ValidationError as ex:
err_msg = f"TestSuite ValidationError:\\nfile: {path}\\nerror: {ex}"
raise exceptions.TestSuiteFormatError(err_msg)
return testsuite_obj
# 读取env文件内容转成字典
def load_dot_env_file(dot_env_path: Text) -> Dict:
""" load .env file.
Args:
dot_env_path (str): .env file path
Returns:
dict: environment variables mapping
{
"UserName": "debugtalk",
"Password": "123456",
"PROJECT_KEY": "ABCDEFGH"
}
Raises:
exceptions.FileFormatError: If .env file format is invalid.
"""
if not os.path.isfile(dot_env_path):
return {}
logger.info(f"Loading environment variables from {dot_env_path}")
env_variables_mapping = {}
with open(dot_env_path, mode="rb") as fp:
for line in fp:
# maxsplit=1
if b"=" in line:
variable, value = line.split(b"=", 1)
elif b":" in line:
variable, value = line.split(b":", 1)
else:
raise exceptions.FileFormatError(".env format error")
env_variables_mapping[
variable.strip().decode("utf-8")
] = value.strip().decode("utf-8")
# 将字典设置到当前系统里
utils.set_os_environ(env_variables_mapping)
return env_variables_mapping
# csv 文件用来参数化的吧
def load_csv_file(csv_file: Text) -> List[Dict]:
""" load csv file and check file content format
Args:
csv_file (str): csv file path, csv file content is like below:
Returns:
list: list of parameters, each parameter is in dict format
Examples:
>>> cat csv_file
username,password
test1,111111
test2,222222
test3,333333
>>> load_csv_file(csv_file)
[
{\'username\': \'test1\', \'password\': \'111111\'},
{\'username\': \'test2\', \'password\': \'222222\'},
{\'username\': \'test3\', \'password\': \'333333\'}
]
"""
if not os.path.isabs(csv_file):
global project_meta
if project_meta is None:
raise exceptions.MyBaseFailure("load_project_meta() has not been called!")
# make compatible with Windows/Linux
csv_file = os.path.join(project_meta.RootDir, *csv_file.split("/"))
if not os.path.isfile(csv_file):
# file path not exist
raise exceptions.CSVNotFound(csv_file)
csv_content_list = []
with open(csv_file, encoding="utf-8") as csvfile:
reader = csv.DictReader(csvfile)
for row in reader:
csv_content_list.append(row)
return csv_content_list
# 加载目录下的各形式测试文件
def load_folder_files(folder_path: Text, recursive: bool = True) -> List:
""" load folder path, return all files endswith .yml/.yaml/.json/_test.py in list.
Args:
folder_path (str): specified folder path to load
recursive (bool): load files recursively if True
Returns:
list: files endswith yml/yaml/json
"""
if isinstance(folder_path, (list, set)):
files = []
for path in set(folder_path):
files.extend(load_folder_files(path, recursive))
return files
if not os.path.exists(folder_path):
return []
file_list = []
# os.walk() 生成目录树中的文件名，
for dirpath, dirnames, filenames in os.walk(folder_path):
filenames_list = []
for filename in filenames:
if not filename.lower().endswith((".yml", ".yaml", ".json", "_test.py")):
continue
filenames_list.append(filename)
for filename in filenames_list:
file_path = os.path.join(dirpath, filename)
file_list.append(file_path)
if not recursive:
break
return file_list
# 加载一个模块的方法返回一个方法字典， 自定义函数实现的一部分
def load_module_functions(module) -> Dict[Text, Callable]:
# import importlib ; debugtalk = importlib.import_module("debugtalk") 可返回module对象
""" load python module functions.
Args:
module: python module
Returns:
dict: functions mapping for specified python module
{
"func1_name": func1,
"func2_name": func2
}
"""
module_functions = {}
# vars(module) 返回模块的对象
for name, item in vars(module).items():
# types.FunctionType 函数类型
if isinstance(item, types.FunctionType):
# 方法名称 作为key 函数对象作为value
module_functions[name] = item
return module_functions
# 加载预置方法
def load_builtin_functions() -> Dict[Text, Callable]:
""" load builtin module functions
"""
return load_module_functions(builtin)
# 定位文件找到向上查找根目录
def locate_file(start_path: Text, file_name: Text) -> Text:
""" locate filename and return absolute file path.
searching will be recursive upward until system root dir.
Args:
file_name (str): target locate file name
start_path (str): start locating path, maybe file path or directory path
Returns:
str: located file path. None if file not found.
Raises:
exceptions.FileNotFound: If failed to locate file.
"""
if os.path.isfile(start_path):
start_dir_path = os.path.dirname(start_path)
elif os.path.isdir(start_path):
start_dir_path = start_path
else:
raise exceptions.FileNotFound(f"invalid path: {start_path}")
file_path = os.path.join(start_dir_path, file_name)
if os.path.isfile(file_path):
# ensure absolute
return os.path.abspath(file_path)
# system root dir
# Windows, e.g. \'E:\\\\\'
# Linux/Darwin, \'/\'
parent_dir = os.path.dirname(start_dir_path)
if parent_dir == start_dir_path:
raise exceptions.FileNotFound(f"{file_name} not found in {start_path}")
# locate recursive upward
return locate_file(parent_dir, file_name)
# 找到debugtalk.py 绝对路径
def locate_debugtalk_py(start_path: Text) -> Text:
""" locate debugtalk.py file
Args:
start_path (str): start locating path,
maybe testcase file path or directory path
Returns:
str: debugtalk.py file path, None if not found
"""
try:
# locate debugtalk.py file.
debugtalk_path = locate_file(start_path, "debugtalk.py")
except exceptions.FileNotFound:
debugtalk_path = None
return debugtalk_path
# 找到项目根目录路径， 和debugtalk_path
def locate_project_root_directory(test_path: Text) -> Tuple[Text, Text]:
""" locate debugtalk.py path as project root directory
Args:
test_path: specified testfile path
Returns:
(str, str): debugtalk.py path, project_root_directory
"""
def prepare_path(path):
if not os.path.exists(path):
err_msg = f"path not exist: {path}"
logger.error(err_msg)
raise exceptions.FileNotFound(err_msg)
if not os.path.isabs(path):
path = os.path.join(os.getcwd(), path)
return path
test_path = prepare_path(test_path)
# locate debugtalk.py file
debugtalk_path = locate_debugtalk_py(test_path)
if debugtalk_path:
# The folder contains debugtalk.py will be treated as project RootDir.
project_root_directory = os.path.dirname(debugtalk_path)
else:
# debugtalk.py not found, use os.getcwd() as project RootDir.
project_root_directory = os.getcwd()
return debugtalk_path, project_root_directory
# 加载debugtalk方法
def load_debugtalk_functions() -> Dict[Text, Callable]:
""" load project debugtalk.py module functions
debugtalk.py should be located in project root directory.
Returns:
dict: debugtalk module functions mapping
{
"func1_name": func1,
"func2_name": func2
}
"""
# load debugtalk.py module
try:
# 动态导入包
imported_module = importlib.import_module("debugtalk")
except Exception as ex:
logger.error(f"error occurred in debugtalk.py: {ex}")
sys.exit(1)
# reload to refresh previously loaded module
# 避免有修改的情况 重载包
imported_module = importlib.reload(imported_module)
# 返回方法字典
return load_module_functions(imported_module)
def load_project_meta(test_path: Text, reload: bool = False) -> ProjectMeta:
""" load testcases, .env, debugtalk.py functions.
testcases folder is relative to project_root_directory
by default, project_meta will be loaded only once, unless set reload to true.
Args:
test_path (str): test file/folder path, locate project RootDir from this path.
reload: reload project meta if set true, default to false
Returns:
project loaded api/testcases definitions,
environments and debugtalk.py functions.
"""
global project_meta
if project_meta and (not reload):
return project_meta
# 实例化
project_meta = ProjectMeta()
if not test_path:
return project_meta
debugtalk_path, project_root_directory = locate_project_root_directory(test_path)
# add project RootDir to sys.path
sys.path.insert(0, project_root_directory)
# load .env file
# NOTICE:
# environment variable maybe loaded in debugtalk.py
# thus .env file should be loaded before loading debugtalk.py
dot_env_path = os.path.join(project_root_directory, ".env")
dot_env = load_dot_env_file(dot_env_path)
if dot_env:
project_meta.env = dot_env
project_meta.dot_env_path = dot_env_path
if debugtalk_path:
# load debugtalk.py functions
debugtalk_functions = load_debugtalk_functions()
else:
debugtalk_functions = {}
# 赋值 项目路径，debugtalk_functions debugtalk地址信息
# locate project RootDir and load debugtalk.py functions
project_meta.RootDir = project_root_directory
project_meta.functions = debugtalk_functions
project_meta.debugtalk_path = debugtalk_path
return project_meta
# 绝对路径转为相对(项目根目录)路径
def convert_relative_project_root_dir(abs_path: Text) -> Text:
""" convert absolute path to relative path, based on project_meta.RootDir
Args:
abs_path: absolute path
Returns: relative path based on project_meta.RootDir
"""
_project_meta = load_project_meta(abs_path)
if not abs_path.startswith(_project_meta.RootDir):
raise exceptions.ParamsError(
f"failed to convert absolute path to relative path based on project_meta.RootDir\\n"
f"abs_path: {abs_path}\\n"
f"project_meta.RootDir: {_project_meta.RootDir}"
)
return abs_path[len(_project_meta.RootDir) + 1 :]
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