Auto Static Server with web.py

Question

12 Years Ago

import os
import web


### Url mappings

urls = [
    '/', 'index',
    '/.*','notfound'
]
for root, dirs, files in os.walk("C:/Users/James/Desktop/server"):
    for f in files:
        u = os.path.join(root,f)
        u=u.strip("/").strip("\\")
        ident=u.lstrip("C:/Users/James/Desktop/server").replace("/","slash").replace("\\","SLASH").replace(".","DOT")
        globals()[ident] = open(u,mode='rb').read()
        exec("""
class %(classname)s:
    def GET(self):
        global %(data)s
        return %(data)s
        """%{"classname":ident+"server","data":ident}, globals(), globals()) #create a class as if were created in the global scope by passing in globals() as locals
        urls.extend((u,ident+"server"))
urls = tuple(urls)
class index:
    def GET(self):
        return "<!DOCTYPE html><html><link rel=\"icon\" href=\"favicon.ico\" type=\"image/x-icon\"/>Hi!</html>"
class favicon:
    def GET(self):
        return open('favicon.ico',mode='rb').read()
class notfound:
    def GET(self):
        return "<!DOCTYPE html><html><link rel=\"icon\" href=\"favicon.ico\" type=\"image/x-icon\"/><b><h1>404 Not Found</h1></b><hr/>Python Server"
print urls
app = web.application(urls, globals())

if __name__ == '__main__':
    app.run()


Traceback (most recent call last):
  File "C:\Users\James\Desktop\server\server.py", line 37, in <module>
    app.run()
  File "C:\Python27\lib\site-packages\web\application.py", line 313, in run
    return wsgi.runwsgi(self.wsgifunc(*middleware))
  File "C:\Python27\lib\site-packages\web\wsgi.py", line 55, in runwsgi
    server_addr = validip(listget(sys.argv, 1, ''))
  File "C:\Python27\lib\site-packages\web\net.py", line 108, in validip
    if validip6addr(ip): return (ip,port)
  File "C:\Python27\lib\site-packages\web\net.py", line 33, in validip6addr
    socket.inet_pton(socket.AF_INET6, address)
AttributeError: 'module' object has no attribute 'inet_pton'

The auto generation seems to beworks correctly. I'm using python 2.7;web.py works for other simple programs.
Full session in interpreter:

('/', 'index', 'C:/Users/James/Desktop/server\\favicon.ico', 'SLASHfaviconDOTicoserver', 'C:/Users/James/Desktop/server\\server.py', 'SLASHserverDOTpyserver')

Traceback (most recent call last):
  File "C:\Users\James\Desktop\server\server.py", line 37, in <module>
    app.run()
  File "C:\Python27\lib\site-packages\web\application.py", line 313, in run
    return wsgi.runwsgi(self.wsgifunc(*middleware))
  File "C:\Python27\lib\site-packages\web\wsgi.py", line 55, in runwsgi
    server_addr = validip(listget(sys.argv, 1, ''))
  File "C:\Python27\lib\site-packages\web\net.py", line 108, in validip
    if validip6addr(ip): return (ip,port)
  File "C:\Python27\lib\site-packages\web\net.py", line 33, in validip6addr
    socket.inet_pton(socket.AF_INET6, address)
AttributeError: 'module' object has no attribute 'inet_pton'
>>> dir()
['SLASHfaviconDOTico', 'SLASHfaviconDOTicoserver', 'SLASHserverDOTpy', 'SLASHserverDOTpyserver', '__builtins__', '__doc__', '__name__', '__package__', 'app', 'dirs', 'f', 'favicon', 'files', 'ident', 'index', 'notfound', 'os', 'root', 'u', 'urls', 'web']
>>> SLASHserverDOTpyserver().GET() #test 
'import os\r\nimport web\r\n\r\n\r\n### Url mappings\r\n\r\nurls = [\r\n    \'/\', \'index\',\r\n]\r\nfor root, dirs, files in os.walk("C:/Users/James/Desktop/server"):\r\n    for f in files:\r\n        u = os.path.join(root,f)\r\n        u=u.strip("/").strip("\\\\")\r\n        ident=u.lstrip("C:/Users/James/Desktop/server").replace("/","slash").replace("\\\\","SLASH").replace(".","DOT")\r\n        globals()[ident] = open(u,mode=\'rb\').read()\r\n        exec("""\r\nclass %(classname)s:\r\n    def GET(self):\r\n        global %(data)s\r\n        return %(data)s\r\n        """%{"classname":ident+"server","data":ident}, globals(), globals())\r\n        urls.extend((u,ident+"server"))\r\nurls = tuple(urls)\r\nclass index:\r\n    def GET(self):\r\n        return "<!DOCTYPE html><html><link rel=\\"icon\\" href=\\"favicon.ico\\" type=\\"image/x-icon\\"/>Hi!</html>"\r\nclass favicon:\r\n    def GET(self):\r\n        return open(\'favicon.ico\',mode=\'rb\').read()\r\nclass notfound:\r\n    def GET(self):\r\n        return "<!DOCTYPE html><html><link rel=\\"icon\\" href=\\"favicon.ico\\" type=\\"image/x-icon\\"/><b><h1>404 Not Found</h1></b><hr/>Python Server"\r\nprint urls\r\napp = web.application(urls, globals())\r\n\r\nif __name__ == \'__main__\':\r\n    app.run()\r\n'

python session web-server

Edited 12 Years Ago by james.lu.75491856

2 Contributors
6 Replies
373 Views
1 Hour Discussion Span
Latest Post 12 Years Ago Latest Post by james.lu.75491856

Dani AI

Generated 9 Months Ago

Short summary: the crash happens because web.net.py calls socket.inet_pton unconditionally, and many Windows/Python 2.7 builds do not provide that function. As pointed out, catching the failure stops the immediate AttributeError; a slightly more robust approach is to prefer inet_pton when present and fall back to a cross‑platform check (getaddrinfo) when it is not. 's later edits (ignoring server scripts and fixing path separators) are sensible safeguards but do not address the underlying validation call in web.py.

A compact, cross‑platform replacement for an IPv6 literal test is shown below. It avoids a bare except and uses getaddrinfo as a fallback when inet_pton is absent:

import socket

def valid_ipv6_literal(address):
    if hasattr(socket, 'inet_pton'):
        try:
            socket.inet_pton(socket.AF_INET6, address)
            return True
        except (socket.error, ValueError):
            return False
    # Fallback for Windows / older Pythons: ask the resolver for AF_INET6 info
    try:
        socket.getaddrinfo(address, None, socket.AF_INET6)
        return True
    except socket.gaierror:
        return False

Other practical notes: avoid generating a separate class per file with exec — use a single catch‑all handler that maps request path to a sanitized filesystem path, set Content-Type via the mimetypes module and web.header, and never serve sensitive files (server.py, .pyc, config files). If modifying library code is undesirable, an immediate workaround is to run web.py with an explicit IPv4 bind (e.g. "127.0.0.1:8080") or upgrade to a Python/web.py version that contains the inet_pton compatibility fixes.

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Gribouillis 1,391 Programming Explorer

12 Years Ago

Use startpage ! Here is a related discussion. You should try and modify net.py according to the last suggestion.

Gribouillis 1,391 Programming Explorer

12 Years Ago

line 32 to line 35, do change like this:

try:
    socket.inet_pton(socket.AF_INET6, address)
except:
    return False

replace socket.inet_pton(socket.AF_INET6, address) by the previous snippet to catch the exception.

Edited 12 Years Ago by Gribouillis

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james.lu.75491856 0 Junior Poster · Answer 1 · 2013-09-29T14:21:39+00:00

james.lu.75491856 0 Junior Poster

12 Years Ago

How?

james.lu.75491856 0 Junior Poster · Answer 2 · 2013-09-29T14:47:00+00:00

Thanks, and now all I need to do know is to ignore server.py and web.py

james.lu.75491856 0 Junior Poster · Answer 3 · 2013-09-29T14:48:48+00:00

I also have fixed the backward slash thing, it used to serve with forward slashes, now it does with backward, chrome converts it.

james.lu.75491856 0 Junior Poster · Answer 4 · 2013-09-29T14:49:10+00:00

Full working program:

import os
import web


### Url mappings

urls = [
    '/', 'index',
]
for root, dirs, files in os.walk("C:/Users/James/Desktop/server"):
    if "web" in dirs:
    dirs.remove("web")
    for f in files:
        u = os.path.join(root,f)
        u=u.strip("/").strip("\\")
        ident=u.lstrip("C:/Users/James/Desktop/server").replace("/","slash").replace("\\","SLASH").replace(".","DOT") #replace invalid python expressions with valid ones
        globals()[ident] = open(u,mode='rb').read()
        exec("""
class %(classname)s:
    def GET(self):
        global %(data)s
        return %(data)s
        """%{"classname":ident+"server","data":ident}, globals(), globals())  #create a class as if were created in the global scope by passing in globals() as locals
        urls.extend((u.lstrip("C:/Users/James/Desktop/server").replace("\\","/"),ident+"server")) #use u not ident because ident has stuff like SLASH and DOT
urls = tuple(urls)
class index:
    def GET(self):
        return "<!DOCTYPE html><html><link rel=\"icon\" href=\"favicon.ico\" type=\"image/x-icon\"/>Hi!</html>"
class favicon:
    def GET(self):
        return open('favicon.ico',mode='rb').read() 
class notfound:
    def GET(self):
        return "<!DOCTYPE html><html><link rel=\"icon\" href=\"favicon.ico\" type=\"image/x-icon\"/><b><h1>404 Not Found</h1></b><hr/>Python Server"
print urls
app = web.application(urls, globals())

if __name__ == '__main__':
    app.run()

Auto Static Server with web.py

Dani AI

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