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ae-routinglib.py
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ae-routinglib.py
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#!/usr/bin/env python2.5
import httplib
import logging
import mimetypes
import os
import re
import sys
import webob
mimetypes.add_type('image/vnd.microsoft.icon', 'ico')
LOG = logging.getLogger('routinglib')
LOG.setLevel(logging.INFO)
VAR_RE = re.compile(r'\${([^}]+)}')
def _re(o, flags, full):
if isinstance(o, (tuple, list)):
o = '|'.join(o)
if full:
o += '$'
return re.compile(o, flags)
def _req(env):
req = env.get('routinglib.Request')
if not req:
env['routinglib.Request'] = req = webob.Request(env)
return req
def _make_expander(s):
bits = VAR_RE.split(s)
if len(bits) == 1:
return lambda env: s
expr_bits = []
while bits:
expr_bits.append(repr(bits.pop()))
expr_bits.append('str(%s)' % bits.pop())
expr_bits.append(repr(bits.pop()))
cod = compile('+'.join(reversed(expr_bits)), '', 'eval')
def expand(env):
env2 = env.copy()
env2['req'] = _req(env)
return eval(cod, env2)
return expand
def _log(_name, fn, *args, **kwargs):
if LOG.level > logging.DEBUG:
return fn
args = filter(None, [
', '.join(repr(a) for a in args),
', '.join('%s=%r' % p for p in kwargs.iteritems()) ])
frame = sys._getframe(2) # inspect is noticeably slow.
msg = '%s:%d: %s(%s)' % (os.path.basename(frame.f_code.co_filename),
frame.f_lineno, _name, ', '.join(args))
def logger(*args):
result = fn(*args)
LOG.info('%s -> %r', msg, result)
return result
return logger
# Predicates.
def host(pat, flags=0, full=True):
match = _re(pat, flags, full).match
return _log('host', lambda env: match(env.get('HTTP_HOST', '')),
pat=pat, flags=flags, full=full)
def ssl(on):
on = 'on' if on else 'off'
return _log('ssl', lambda env: env.get('HTTPS') == on,
on=on)
def path(pat, flags=0, full=True):
match = _re(pat, flags, full).match
return _log('path', lambda env: match(env.get('PATH_INFO', '')),
pat=pat, flags=flags, full=full)
def getvar(name, pat='.*', flags=0, full=True):
match = _re(pat, flags, full).match
def pred(env):
value = _req(env).GET.get(name)
return value is not None and match(value)
return _log('getvar', pred, name=name, pat=pat, flags=flags, full=full)
def postvar(name, pat, flags=0, full=True):
match = _re(pat, flags, full).match
return _log('postvar',
lambda env: match(_req(env).POST.get(name, '')),
name=name, pat=pat, flags=flags, full=full)
def method(pat, flags=0, full=True):
match = _re(pat, flags, full).match
return _log('method',
lambda env: match(env.get('REQUEST_METHOD', '')),
pat=pat, flags=flags, full=full)
def url(pat, flags=0, full=True):
match = _re(pat, flags, full).match
return _log('url', lambda env: match(_req(env).path_url),
pat=pat, flags=flags, full=full)
def urlqs(pat, flags=0, full=True):
match = _re(pat, flags, full).match
return _log('urlqs', lambda env: match(_req(env).url),
pat=pat, flags=flags, full=full)
def admin():
return _log('admin', lambda env: env.get('USER_ID_ADMIN') == '1')
def allof(*preds):
return _log('allof', lambda env: all(p(env) for p in preds))
def anyof(*preds):
return _log('anyof', lambda env: any(p(env) for p in preds))
def invert(pred):
return _log('invert', lambda env: not pred(env))
def always(boolean=True):
return _log('always', lambda env: boolean, boolean=boolean)
# Helpers.
def ae_handler(klass, **extra):
if extra:
klass = type(klass.__name__ + 'Custom', (klass,), extra)
return _log('ae_handler', webapp.WSGIApplication([('.*', klass)]),
klass=klass, extra=extra)
def ae_ext_module(modpath, **extra):
dirname, modname = os.path.split(modpath)
modname = os.path.splitext(modname)[0]
dirname = os.path.abspath(dirname)
def app(env, start_response):
sys_path = sys.path[:]
sys.path.insert(0, dirname)
try:
return __import__(modname).main()
finally:
sys.path[:] = sys_path
return _log('ae_ext_module', app, modpath=modpath, extra=extra)
def proxy(dest):
from google.appengine.api import urlfetch
def app(env, start_response):
headers = _req(env).headers
headers['X-Forwarded-For'] = env.get('REMOTE_ADDR')
response = urlfetch.fetch(dest, headers=headers)
code = response.status_code
status = '%s %s' % (code, httplib.responses.get(code, code))
start_response(status, response.headers.items())
return response.content,
return _log('proxy', app, dest=dest)
def redirect(dest, permanent=True):
return respond(301 if permanent else 302, Location=dest)
def respond(code, entity=None, **headers):
msg = '%s %s' % (code, httplib.responses.get(code, code))
headers = [(k.replace('_', '-').title(), v) for (k, v) in headers.iteritems()]
entity_ = entity
if 'Content-Type' not in (h[0] for h in headers):
headers.append(('Content-Type', 'text/html'))
entity = '<h1>%s</h1>' % msg
entity = () if entity is None else entity,
def app(env, start_response):
start_response(msg, headers)
return entity
return _log('status', app, code, entity=entity_, headers=headers)
def static(path, expires=60*60*24*7, ctype=None, **headers):
expand = _make_expander(path)
headers = headers.items()
e404 = respond(404)
import stat
def app(env, start_response):
path = expand(env)
try:
st = os.stat(path)
except OSError:
st = None
if not (st and stat.S_ISREG(st.st_mode)):
return e404(env, start_response)
ctype_ = ctype or mimetypes.guess_type(path)[0]
resp = webob.Response(body=file(path).read(),
last_modified=st.st_mtime,
content_type=ctype_,
headerlist=headers,
conditional_response=True)
resp.cache_expires(expires)
return resp(env, start_response)
return app
def ae_main(app):
from google.appengine.ext.webapp import util
import __main__ as mod
# "if caller is main"
if sys._getframe(1).f_code.co_filename == mod.__file__:
mod.main = lambda: util.run_wsgi_app(app)
mod.main()
# Modifiers.
def rebase(pat, repl='', flags=0, prefix=True, full=False):
if isinstance(pat, (tuple, list)):
pat = '|'.join(pat)
if prefix:
pat = '^(?:%s)' % pat
sub = _re(pat, flags, full).sub
def rebaser(env):
env['PATH_INFO'] = sub(repl, env.get('PATH_INFO', ''))
return _log('rebase', rebaser,
pat=pat, repl=repl, flags=flags, prefix=prefix, full=full)
# Router.
def chain(*pairs):
def app(env, start_response):
for p in pairs:
if type(p) is tuple:
if p[0](env): # pred,app pair
return p[1](env, start_response)
else: # modifier
p(env)
return _log('chain', app)
API = dict((fn.__name__, fn) for fn in (
host, ssl, path, getvar, postvar, method, admin, allof, anyof, invert,
ae_handler, ae_ext_module, proxy, respond, static, redirect, ae_main,
rebase, chain, always, url, urlqs
))
def install(dct, debug=False):
dct.update(API)
if debug:
LOG.setLevel(logging.DEBUG)