"""BaseHTTPServer that implements the Python WSGI protocol (PEP 333, rev 1.21)

This is both an example of how WSGI can be implemented, and a basis for running
simple web applications on a local machine, such as might be done when testing
or debugging an application. It has not been reviewed for security issues,
however, and we strongly recommend that you use a "real" web server for
production use.

For example usage, see the 'if __name__=="__main__"' block at the end of the
module. See also the BaseHTTPServer module docs for other API information.
"""

from BaseHTTPServer import BaseHTTPRequestHandler, HTTPServer
import urllib, sys
from wsgiref.handlers import SimpleHandler

__version__ = "0.1"
__all__ = ['WSGIServer', 'WSGIRequestHandler', 'demo_app', 'make_server']


server_version = "WSGIServer/" + __version__
sys_version = "Python/" + sys.version.split()[0]
software_version = server_version + ' ' + sys_version


class ServerHandler(SimpleHandler):

server_software = software_version

def close(self):
try:
self.request_handler.log_request(
self.status.split(' ',1)[0], self.bytes_sent
)
finally:
SimpleHandler.close(self)



class WSGIServer(HTTPServer):

"""BaseHTTPServer that implements the Python WSGI protocol"""

application = None

def server_bind(self):
"""Override server_bind to store the server name."""
HTTPServer.server_bind(self)
self.setup_environ()

def setup_environ(self):
# Set up base environment
env = self.base_environ = {}
env['SERVER_NAME'] = self.server_name
env['GATEWAY_INTERFACE'] = 'CGI/1.1'
env['SERVER_PORT'] = str(self.server_port)
env['REMOTE_HOST']=''
env['CONTENT_LENGTH']=''
env['SCRIPT_NAME'] = ''

def get_app(self):
return self.application

def set_app(self,application):
self.application = application



class WSGIRequestHandler(BaseHTTPRequestHandler):

server_version = "WSGIServer/" + __version__

def get_environ(self):
env = self.server.base_environ.copy()
env['SERVER_PROTOCOL'] = self.request_version
env['REQUEST_METHOD'] = self.command
if '?' in self.path:
path,query = self.path.split('?',1)
else:
path,query = self.path,''

env['PATH_INFO'] = urllib.unquote(path)
env['QUERY_STRING'] = query

host = self.address_string()
if host != self.client_address[0]:
env['REMOTE_HOST'] = host
env['REMOTE_ADDR'] = self.client_address[0]

if self.headers.typeheader is None:
env['CONTENT_TYPE'] = self.headers.type
else:
env['CONTENT_TYPE'] = self.headers.typeheader

length = self.headers.getheader('content-length')
if length:
env['CONTENT_LENGTH'] = length

for h in self.headers.headers:
k,v = h.split(':',1)
k=k.replace('-','_').upper(); v=v.strip()
if k in env:
continue # skip content length, type,etc.
if 'HTTP_'+k in env:
env['HTTP_'+k] += ','+v # comma-separate multiple headers
else:
env['HTTP_'+k] = v
return env

def get_stderr(self):
return sys.stderr

def handle(self):
"""Handle a single HTTP request"""

self.raw_requestline = self.rfile.readline()
if not self.parse_request(): # An error code has been sent, just exit
return

handler = ServerHandler(
self.rfile, self.wfile, self.get_stderr(), self.get_environ()
)
handler.request_handler = self # backpointer for logging
handler.run(self.server.get_app())



def demo_app(environ,start_response):
from StringIO import StringIO
stdout = StringIO()
print >>stdout, "Hello world!"
print >>stdout
h = environ.items(); h.sort()
for k,v in h:
print >>stdout, k,'=', repr(v)
start_response("200 OK", [('Content-Type','text/plain')])
return [stdout.getvalue()]


def make_server(
host, port, app, server_class=WSGIServer, handler_class=WSGIRequestHandler
):
"""Create a new WSGI server listening on `host` and `port` for `app`"""
server = server_class((host, port), handler_class)
server.set_app(app)
return server


if __name__ == '__main__':
httpd = make_server('', 8000, demo_app)
sa = httpd.socket.getsockname()
print "Serving HTTP on", sa[0], "port", sa[1], "..."
import webbrowser
webbrowser.open('http://localhost:8000/xyz?abc')
httpd.handle_request() # serve one request, then exit
httpd.server_close()