python-simple-http-server

Discription

This is a simple http server, use MVC like design.

Support Python Version

Python 3.7+

from 0.4.0, python 2.7 is no longer supported, if you are using python 2.7, please use version 0.3.1

Why choose

• Lightway.
• Functional programing.
• Filter chain support.
• Session support.
• Spring MVC like request mapping.
• SSL support.
• Easy to use.
• Free style controller writing.

How to use

Install

pip install simple_http_server

Write Controllers

from simple_http_server import request_map
from simple_http_server import Response
from simple_http_server import MultipartFile
from simple_http_server import Parameter
from simple_http_server import Parameters
from simple_http_server import Header
from simple_http_server import JSONBody
from simple_http_server import HttpError
from simple_http_server import StaticFile
from simple_http_server import Headers
from simple_http_server import Cookies
from simple_http_server import Cookie
from simple_http_server import Redirect


@request_map("/index")
def my_ctrl():
    return {"code": 0, "message": "success"}  # You can return a dictionary, a string or a `simple_http_server.simple_http_server.Response` object.


@request_map("/say_hello", method=["GET", "POST"])
def my_ctrl2(name, name2=Parameter("name", default="KEIJACK")):
    """name and name2 is the same"""
    return "<!DOCTYPE html><html><body>hello, %s, %s</body></html>" % (name, name2)


@request_map("/error")
def my_ctrl3():
    return Response(status_code=500)


@request_map("/exception")
def exception_ctrl():
    raise HttpError(400, "Exception")

@request_map("/upload", method="GET")
def show_upload():
    root = os.path.dirname(os.path.abspath(__file__))
    return StaticFile("%s/my_dev/my_test_index.html" % root, "text/html; charset=utf-8")

@request_map("/upload", method="POST")
def my_upload(img=MultipartFile("img")):
    root = os.path.dirname(os.path.abspath(__file__))
    img.save_to_file(root + "/my_dev/imgs/" + img.filename)
    return "<!DOCTYPE html><html><body>upload ok!</body></html>"


@request_map("/post_txt", method="POST")
def normal_form_post(txt):
    return "<!DOCTYPE html><html><body>hi, %s</body></html>" % txt

@request_map("/tuple")
def tuple_results():
    # The order here is not important, we consider the first `int` value as status code,
    # All `Headers` object will be sent to the response
    # And the first valid object whose type in (str, unicode, dict, StaticFile, bytes) will
    # be considered as the body
    return 200, Headers({"my-header": "headers"}), {"success": True}

"""
" Cookie_sc will not be written to response. It's just some kind of default
" value
"""
@request_map("tuple_cookie")
def tuple_with_cookies(all_cookies=Cookies(), cookie_sc=Cookie("sc")):
    print("=====> cookies ")
    print(all_cookies)
    print("=====> cookie sc ")
    print(cookie_sc)
    print("======<")
    import datetime
    expires = datetime.datetime(2018, 12, 31)

    cks = Cookies()
    # cks = cookies.SimpleCookie() # you could also use the build-in cookie objects
    cks["ck1"] = "keijack"
    cks["ck1"]["path"] = "/"
    cks["ck1"]["expires"] = expires.strftime(Cookies.EXPIRE_DATE_FORMAT)
    # You can ignore status code, headers, cookies even body in this tuple.
    return Header({"xx": "yyy"}), cks, "<html><body>OK</body></html>"

"""
" If you visit /a/b/xyz/x，this controller function will be called, and `path_val` will be `xyz`
"""
@request_map("/a/b/{path_val}/x")
def my_path_val_ctr(path_val=PathValue()):
    return "<html><body>%s</body></html>" % path_val


@request_map("/redirect")
def redirect():
    return Redirect("/index")

@request_map("session")
def test_session(session=Session(), invalid=False):
    ins = session.get_attribute("in-session")
    if not ins:
        session.set_attribute("in-session", "Hello, Session!")

    __logger.info("session id: %s" % session.id)
    if invalid:
        __logger.info("session[%s] is being invalidated. " % session.id)
        session.invalidate()
    return "<!DOCTYPE html><html><body>%s</body></html>" % str(ins)

Beside using the default values, you can also use variable annotations to specify your controller function's variables.

@request_map("/say_hello/to/{name}", method=["GET", "POST", "PUT"])
def your_ctroller_function(
        user_name: str, # req.parameter["user_name"]，400 error will raise when there's no such parameter in the query string.
        password: str, # req.parameter["password"]，400 error will raise when there's no such parameter in the query string.
        skills: list, # req.parameters["skills"]，400 error will raise when there's no such parameter in the query string.
        all_headers: Headers, # req.headers
        user_token: Header, # req.headers["user_token"]，400 error will raise when there's no such parameter in the quest headers.
        all_cookies: Cookies, # req.cookies, return all cookies
        user_info: Cookie, # req.cookies["user_info"]，400 error will raise when there's no such parameter in the cookies.
        name: PathValue, # req.path_values["name"]，get the {name} value from your path.
        session: Session # req.getSession(True)，get the session, if there is no sessions, create one.
    ):
    return "<html><body>Hello, World!</body></html>"

Write filters

from simple_http_server import filter_map

# Please note filter will map a regular expression, not a concrect url.
@filter_map("^/tuple")
def filter_tuple(ctx):
    print("---------- through filter ---------------")
    # add a header to request header
    ctx.request.headers["filter-set"] = "through filter"
    if "user_name" not in ctx.request.parameter:
        ctx.response.send_redirect("/index")
    elif "pass" not in ctx.request.parameter:
        ctx.response.send_error(400, "pass should be passed")
        # you can also raise a HttpError
        # raise HttpError(400, "pass should be passed")
    else:
        # you should always use do_chain method to go to the next
        ctx.do_chain()

Start your server

# If you place the controllers method in the other files, you should import them here.

import simple_http_server.server as server
import my_test_ctrl


def main(*args):
    # The following method can import several controller files once.
    server.scan("my_ctr_pkg", r".*controller.*")
    server.start()

if __name__ == "__main__":
    main()

If you want to specify the host and port:

    server.start(host="", port=8080)

If you want to specify the resources path:

Notice: /path_prefix///path_prefix/*//path_prefix/** is the same effect.

    server.start(resources={"/path_prefix/*", "/absolute/dir/root/path",
                            "/path_prefix/*", "/absolute/dir/root/path"})

If you want to use ssl:

    server.start(host="", 
                 port=8443,
                 ssl=True,
                 ssl_protocol=ssl.PROTOCOL_TLS_SERVER, # Optional, default is ssl.PROTOCOL_TLS_SERVER, which will auto detect the highted protocol version that both server and client support. 
                 ssl_check_hostname=False, #Optional, if set to True, if the hostname is not match the certificat, it cannot establish the connection, default is False.
                 keyfile="/path/to/your/keyfile.key",
                 certfile="/path/to/your/certfile.cert",
                 keypass="", # Optional, your private key's password
                 )

Logger

The default logger is try to write logs to the screen, you can specify the logger handler to write it to a file.

import simple_http_server.logger as logger
import logging

_formatter = logging.Formatter(fmt='[%(asctime)s]-[%(name)s]-%(levelname)-4s: %(message)s')
_handler = logging.TimedRotatingFileHandler("/var/log/simple_http_server.log", when="midnight", backupCount=7)
_handler.setFormatter(_formatter)
_handler.setLevel("INFO")

logger.set_handler(_handler)

If you want to add a handler rather than replace the inner one, you can use:

logger.add_handler(_handler)

If you want to change the logger level:

logger.set_level("DEBUG")

This logger will first save all the log record to a global queue, and then output them in a background thread, so it is very suitable for getting several logger with a same handler, especialy the TimedRotatingFileHandler which may slice the log files not quite well in a mutiple thread environment.

Problems

Multipul threading safety

For this is a SIMPLE http server, I have not done much work to ensure multipul threading safety. It may cause some problem if you trid to write data to Request and Response objects in multipul threads in one request scope (including in filters and controller functions).