以下主要介绍如何封装请求。
还记得我们之前写的get请求、post请求么？
大家应该有体会，每个请求类型都写成单独的函数，代码复用性不强。
接下来将请求类型都封装起来，自动化用例都可以用这个封装的请求类进行请求，我们将常用的get、post请求封装起来。
import requests
class RequestHandler:
def get(self, url, **kwargs):
"""封装get方法"""
# 获取请求参数
params = kwargs.get("params")
headers = kwargs.get("headers")
try:
result = requests.get(url, params=params, headers=headers)
return result
except Exception as e:
print("get请求错误: %s" % e)
def post(self, url, **kwargs):
"""封装post方法"""
# 获取请求参数
params = kwargs.get("params")
data = kwargs.get("data")
json = kwargs.get("json")
try:
result = requests.post(url, params=params, data=data, json=json)
return result
except Exception as e:
print("post请求错误: %s" % e)
def run_main(self, method, **kwargs):
"""
判断请求类型
:param method: 请求接口类型
:param kwargs: 选填参数
:return: 接口返回内容
"""
if method == 'get':
result = self.get(**kwargs)
return result
elif method == 'post':
result = self.post(**kwargs)
return result
else:
print('请求接口类型错误')
if __name__ == '__main__':
# 以下是测试代码
# get请求接口
url = 'https://api.apiopen.top/getJoke?page=1&count=2&type=video'
res = RequestHandler().get(url)
# post请求接口
url2 = 'http://127.0.0.1:8000/user/login/'
payload = {
"username": "vivi",
"password": "123456"
}
res2 = RequestHandler().post(url2,json=payload)
print(res.json())
print(res2.json())
请求结果如下：
{'code': 200, 'message': '成功!', 'result': [{'sid': '31004305', 'text': '羊：师傅，理个发，稍微修一下就行', 'type': 'video', 'thumbnail': 'http://wimg.spriteapp.cn/picture/2020/0410/5e8fbf227c7f3_wpd.jpg', 'video': 'http://uvideo.spriteapp.cn/video/2020/0410/5e8fbf227c7f3_wpd.mp4', 'images': None, 'up': '95', 'down': '1', 'forward': '0', 'comment': '25', 'uid': '23189193', 'name': '青川小舟', 'header': 'http://wimg.spriteapp.cn/profile/large/2019/12/24/5e01934bb01b5_mini.jpg', 'top_comments_content': None, 'top_comments_voiceuri': None, 'top_comments_uid': None, 'top_comments_name': None, 'top_comments_header': None, 'passtime': '2020-04-12 01:43:02'}, {'sid': '30559863', 'text': '机器人女友，除了不能生孩子，其他的啥都会，价格239000元', 'type': 'video', 'thumbnail': 'http://wimg.spriteapp.cn/picture/2020/0306/5e61a41172a1b_wpd.jpg', 'video': 'http://uvideo.spriteapp.cn/video/2020/0306/5e61a41172a1b_wpd.mp4', 'images': None, 'up': '80', 'down': '6', 'forward': '3', 'comment': '20', 'uid': '23131273', 'name': '水到渠成', 'header': 'http://wimg.spriteapp.cn/profile/large/2019/07/04/5d1d90349cd1a_mini.jpg', 'top_comments_content': '为游戏做的秀', 'top_comments_voiceuri': '', 'top_comments_uid': '10250040', 'top_comments_name': '不得姐用户', 'top_comments_header': 'http://wimg.spriteapp.cn/profile', 'passtime': '2020-04-11 20:43:49'}]}
{'token': 'eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJ1c2VyX2lkIjoxLCJ1c2VybmFtZSI6InZpdmkiLCJleHAiOjE1ODY4NTc0MzcsImVtYWlsIjoidml2aUBxcS5jb20ifQ.k6y0dAfNU2o9Hd9LFfxEk1HKgczlQfUaKE-imPfTsm4', 'user_id': 1, 'username': 'vivi'}
这样就完美了吗，no,no,no。以上代码痛点如下：
代码量大：只是封装了get、post请求，加上其他请求类型，代码量较大；
缺少会话管理：请求之间如何保持会话状态。
我们再来回顾下get、post等请求源码，看下是否有啥特点。
get请求源码：
def get(url, params=None, **kwargs):
r"""Sends a GET request.
:param url: URL for the new :class:`Request` object.
:param params: (optional) Dictionary, list of tuples or bytes to send
in the query string for the :class:`Request`.
:param **kwargs: Optional arguments that ``request`` takes.
:return: :class:`Response <Response>` object
:rtype: requests.Response
"""
kwargs.setdefault('allow_redirects', True)
return request('get', url, params=params, **kwargs)
post请求源码：
def post(url, data=None, json=None, **kwargs):
r"""Sends a POST request.
:param url: URL for the new :class:`Request` object.
:param data: (optional) Dictionary, list of tuples, bytes, or file-like
object to send in the body of the :class:`Request`.
:param json: (optional) json data to send in the body of the :class:`Request`.
:param **kwargs: Optional arguments that ``request`` takes.
:return: :class:`Response <Response>` object
:rtype: requests.Response
"""
return request('post', url, data=data, json=json, **kwargs)
仔细研究下，发现get、post请求返回的都是request函数。
既然这样，我们再来研究下request源码：
def request(method, url, **kwargs):
"""Constructs and sends a :class:`Request <Request>`.
:param method: method for the new :class:`Request` object.
:param url: URL for the new :class:`Request` object.
:param params: (optional) Dictionary, list of tuples or bytes to send
in the query string for the :class:`Request`.
:param data: (optional) Dictionary, list of tuples, bytes, or file-like
object to send in the body of the :class:`Request`.
:param json: (optional) A JSON serializable Python object to send in the body of the :class:`Request`.
:param headers: (optional) Dictionary of HTTP Headers to send with the :class:`Request`.
:param cookies: (optional) Dict or CookieJar object to send with the :class:`Request`.
:param files: (optional) Dictionary of ``'name': file-like-objects`` (or ``{'name': file-tuple}``) for multipart encoding upload.
``file-tuple`` can be a 2-tuple ``('filename', fileobj)``, 3-tuple ``('filename', fileobj, 'content_type')``
or a 4-tuple ``('filename', fileobj, 'content_type', custom_headers)``, where ``'content-type'`` is a string
defining the content type of the given file and ``custom_headers`` a dict-like object containing additional headers
to add for the file.
:param auth: (optional) Auth tuple to enable Basic/Digest/Custom HTTP Auth.
:param timeout: (optional) How many seconds to wait for the server to send data
before giving up, as a float, or a :ref:`(connect timeout, read
timeout) <timeouts>` tuple.
:type timeout: float or tuple
:param allow_redirects: (optional) Boolean. Enable/disable GET/OPTIONS/POST/PUT/PATCH/DELETE/HEAD redirection. Defaults to ``True``.
:type allow_redirects: bool
:param proxies: (optional) Dictionary mapping protocol to the URL of the proxy.
:param verify: (optional) Either a boolean, in which case it controls whether we verify
the server's TLS certificate, or a string, in which case it must be a path
to a CA bundle to use. Defaults to ``True``.
:param stream: (optional) if ``False``, the response content will be immediately downloaded.
:param cert: (optional) if String, path to ssl client cert file (.pem). If Tuple, ('cert', 'key') pair.
:return: :class:`Response <Response>` object
:rtype: requests.Response
Usage::
>>> import requests
>>> req = requests.request('GET', 'https://httpbin.org/get')
<Response [200]>
"""
# By using the 'with' statement we are sure the session is closed, thus we
# avoid leaving sockets open which can trigger a ResourceWarning in some
# cases, and look like a memory leak in others.
with sessions.Session() as session:
return session.request(method=method, url=url, **kwargs)
源码看起来很长，其实只有三行，大部分是代码注释。从源码中可以看出，不管是get还是post亦或其他请求类型，最终都是调用request函数。
既然这样，我们可以不像之前那样，在类内定义get方法、post方法，而是定义一个通用的方法，直接调用request函数即可。看起来有点绕，用代码实现就清晰了。
import requests
class RequestHandler:
def __init__(self):
"""session管理器"""
self.session = requests.session()
def visit(self, method, url, params=None, data=None, json=None, headers=None, **kwargs):
return self.session.request(method,url, params=params, data=data, json=json, headers=headers,**kwargs)
def close_session(self):
"""关闭session"""
self.session.close()
if __name__ == '__main__':
# 以下是测试代码
# post请求接口
url = 'http://127.0.0.1:8000/user/login/'
payload = {
"username": "vivi",
"password": "123456"
}
req = RequestHandler()
login_res = req.visit("post", url, json=payload)
print(login_res.text)
响应结果：
{
"token": "eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJ1c2VyX2lkIjoxLCJ1c2VybmFtZSI6InZpdmkiLCJleHAiOjE1ODY4Njk3ODQsImVtYWlsIjoidml2aUBxcS5jb20ifQ.OD4HIv8G0HZ_RCk-GTVAZ9ADRjwqr3o0E32CC_2JMLg",
"user_id": 1,
"username": "vivi"
}
这次请求封装简洁实用，当然小伙伴们也可以根据自己的需求自行封装。
总结：本文主要通过源码分析，总结出一套简洁的请求类封装。