#-*- coding:utf-8 -*-
import sys, os
from http.server import BaseHTTPRequestHandler, HTTPServer
#----------------------------------------------------------------------------------
class ServerException(Exception):
'''服务器内部错误'''
pass
#----------------------------------------------------------------------------------
class base_case(object):
"""条件处理基类"""
#从地址中读取文件送给send_content()返回请求
def handle_file(self,hander,full_path):
try:
with open(full_path, 'rb') as reader:
content = reader.read()
hander.send_content(content)
except IOError as msg:
msg = "'{0}' cannot be read: {1}".format(full_path, msg)
hander.handle_error(msg)
#将两个路径组合后返回为首页路径
def index_path(self, handler):
return os.path.join(handler.full_path, 'index.html')
#
def test(self, handler):
assert False,'Not implemented'
#
def act(self, handler):
assert False,'Not implemented'
#----------------------------------------------------------------------------------
class case_no_file(base_case):
'''文件或目录不存在'''
def test(self, handler):
return not os.path.exists(handler.full_path)
#如果path存在，返回True；如果path不存在，返回False
def act(self, handler):
raise ServerException("'{0}' not found".format(handler.path))
#----------------------------------------------------------------------------------
class case_cgi_file(base_case):
'''可执行脚本'''
def run_cgi(self, handler):
data = subprocess.check_output(["python3", handler.full_path],shell=False)
handler.send_content(data)
def test(self, handler):
return os.path.isfile(handler.full_path) and \
handler.full_path.endswith('.py')
def act(self, handler):
self.run_cgi(handler)
#----------------------------------------------------------------------------------
class case_existing_file(base_case):
'''该路径是文件'''
def test(self, handler):
return os.path.isfile(handler.full_path)
#如果path是一个存在的文件，返回True。否则返回False
def act(self, handler):
self.handle_file(handler,handler.full_path)
#----------------------------------------------------------------------------------
class case_directory_index_file(base_case):
'''在跟路径下返回主页文件'''
#判断目标路径是否是目录&&目录下是否有index.html
def test(self, handler):
return os.path.isdir(handler.full_path) and \
os.path.isfile(self.index_path(handler))
#isdir函数判断某一路径是否为目录
#响应index.html的内容
def act(self, handler):
self.handle_file(handler,self.index_path(handler))
#----------------------------------------------------------------------------------
class case_always_fail(object):
'''所有情况都不符合时的默认处理类'''
def test(self, handler):
return True
def act(self, handler):
raise ServerException("Unknown object '{0}'".format(handler.path))
#一、创建一个请求处理类
#1.模块的 BaseHTTPRequestHandler类 会帮我们处理对请求的解析
#2.并通过确定请求的方法来调用其对应的函数(方法Get对应do_get方法)
#----------------------------------------------------------------------------------
#RequestHandler 继承了 BaseHTTPRequestHandler 并重写了 do_GET 方法
class RequestHandler(BaseHTTPRequestHandler):
'''
请求路径合法则返回相应处理
否则返回错误页面
'''
Cases = [case_no_file(),
case_cgi_file(),
case_existing_file(),
case_directory_index_file(),
case_always_fail()]
# 错误页面模板
Error_Page = """\
<html>
<body>
<h1>Error accessing {path}</h1>
<p>{msg}</p>
</body>
</html>
"""
def do_GET(self):
try:
#得到完整的请求路径
#os.getcwd()返回当前进程的工作目录
#BaseHTTPRequestHandler类使请求的相对路径保存在self.path
self.full_path = os.getcwd() + self.path
# 遍历所有的情况并处理
for case in self.Cases:
if case.test(self):
case.act(self)
break
# 处理异常
except Exception as msg:
self.handle_error(msg)
#错误处理函数
def handle_error(self, msg):
content = self.Error_Page.format(path=self.path, msg=msg)
self.send_content(content.encode("utf-8"),404) #content内容被编码为二进制
# 发送数据到客户端
def send_content(self,content, status=200):
self.send_response(status)
self.send_header("Content-Type", "text/html") #Content-Type 告诉客户端要以处理html文件的方式处理返回的内容
self.send_header("Content-Length", str(len(content)))
self.end_headers() #end_headers 方法会插入一个空白行
self.wfile.write(content)
#主函数
if __name__ == '__main__':
serverAddress = ('', 8080)
#二、实例化一个服务器类，传入服务器的地址和请求处理程序类
server = HTTPServer(serverAddress, RequestHandler)
#三、调用handle_request()(一般是调用其他事件循环或者使用select())或serve_forever()
server.serve_forever()
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