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import cStringIO, urllib, time, sys, traceback
import version, flow
def date_time_string():
"""Return the current date and time formatted for a message header."""
WEEKS = ['Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat', 'Sun']
MONTHS = [None,
'Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun',
'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec']
now = time.time()
year, month, day, hh, mm, ss, wd, y, z = time.gmtime(now)
s = "%s, %02d %3s %4d %02d:%02d:%02d GMT" % (
WEEKS[wd],
day, MONTHS[month], year,
hh, mm, ss)
return s
class WSGIAdaptor:
def __init__(self, app, domain, port):
self.app, self.domain, self.port = app, domain, port
def make_environ(self, request, errsoc):
if '?' in request.path:
path_info, query = request.path.split('?', 1)
else:
path_info = request.path
query = ''
environ = {
'wsgi.version': (1, 0),
'wsgi.url_scheme': request.scheme,
'wsgi.input': cStringIO.StringIO(request.content),
'wsgi.errors': errsoc,
'wsgi.multithread': True,
'wsgi.multiprocess': False,
'wsgi.run_once': False,
'SERVER_SOFTWARE': version.NAMEVERSION,
'REQUEST_METHOD': request.method,
'SCRIPT_NAME': '',
'PATH_INFO': urllib.unquote(path_info),
'QUERY_STRING': query,
'CONTENT_TYPE': request.headers.get('Content-Type', [''])[0],
'CONTENT_LENGTH': request.headers.get('Content-Length', [''])[0],
'SERVER_NAME': self.domain,
'SERVER_PORT': self.port,
# FIXME: We need to pick up the protocol read from the request.
'SERVER_PROTOCOL': "HTTP/1.1",
}
if request.client_conn.address:
environ["REMOTE_ADDR"], environ["REMOTE_PORT"] = request.client_conn.address
for key, value in request.headers.items():
key = 'HTTP_' + key.upper().replace('-', '_')
if key not in ('HTTP_CONTENT_TYPE', 'HTTP_CONTENT_LENGTH'):
environ[key] = value
return environ
def error_page(self, soc, headers_sent, s):
"""
Make a best-effort attempt to write an error page. If headers are
already sent, we just bung the error into the page.
"""
c = """
<html>
<h1>Internal Server Error</h1>
<pre>%s"</pre>
</html>
"""%s
if not headers_sent:
soc.write("HTTP/1.1 500 Internal Server Error\r\n")
soc.write("Content-Type: text/html\r\n")
soc.write("Content-Length: %s\r\n"%len(c))
soc.write("\r\n")
soc.write(c)
def serve(self, request, soc):
state = dict(
response_started = False,
headers_sent = False,
status = None,
headers = None
)
def write(data):
if not state["headers_sent"]:
soc.write("HTTP/1.1 %s\r\n"%state["status"])
h = state["headers"]
if 'server' not in h:
h["Server"] = [version.NAMEVERSION]
if 'date' not in h:
h["Date"] = [date_time_string()]
soc.write(str(h))
soc.write("\r\n")
state["headers_sent"] = True
soc.write(data)
soc.flush()
def start_response(status, headers, exc_info=None):
if exc_info:
try:
if state["headers_sent"]:
raise exc_info[0], exc_info[1], exc_info[2]
finally:
exc_info = None
elif state["status"]:
raise AssertionError('Response already started')
state["status"] = status
state["headers"] = flow.ODictCaseless(headers)
return write
errs = cStringIO.StringIO()
try:
dataiter = self.app(self.make_environ(request, errs), start_response)
for i in dataiter:
write(i)
if not state["headers_sent"]:
write("")
except Exception, v:
try:
s = traceback.format_exc()
self.error_page(soc, state["headers_sent"], s)
except Exception, v: # pragma: no cover
pass # pragma: no cover
return errs.getvalue()
class AppRegistry:
def __init__(self):
self.apps = {}
def add(self, app, domain, port):
"""
Add a WSGI app to the registry, to be served for requests to the
specified domain, on the specified port.
"""
self.apps[(domain, port)] = WSGIAdaptor(app, domain, port)
def get(self, request):
"""
Returns an WSGIAdaptor instance if request matches an app, or None.
"""
return self.apps.get((request.host, request.port), None)
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