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# vim: set sw=4 expandtab :
#
# Copyright (C) 2000, 2001, 2013 Gregory Trubetskoy
# Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007 Apache Software Foundation
#
# Licensed under the Apache License, Version 2.0 (the "License"); you
# may not use this file except in compliance with the License. You
# may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
# implied. See the License for the specific language governing
# permissions and limitations under the License.
#
# This file originally written by Sterling Hughes
#
from . import apache, Session, util, _psp
import _apache
import sys
import os
import marshal
import types
from cgi import escape
import dbm, dbm
import tempfile
PY2 = sys.version[0] == '2'
# dbm types for cache
dbm_types = {}
tempdir = tempfile.gettempdir()
def path_split(filename):
dir, fname = os.path.split(filename)
if sys.platform.startswith("win"):
dir += "\\"
else:
dir += "/"
return dir, fname
def code2str(c):
ctuple = (c.co_argcount, c.co_nlocals, c.co_stacksize, c.co_flags,
c.co_code, c.co_consts, c.co_names, c.co_varnames, c.co_filename,
c.co_name, c.co_firstlineno, c.co_lnotab)
return marshal.dumps(ctuple)
def str2code(s):
return types.CodeType(*marshal.loads(s))
class PSPInterface:
def __init__(self, req, filename, form):
self.req = req
self.filename = filename
self.error_page = None
self.form = form
def set_error_page(self, page):
if page and page[0] == '/':
# relative to document root
self.error_page = PSP(self.req, self.req.document_root() + page)
else:
# relative to same dir we're in
dir = path_split(self.filename)[0]
self.error_page = PSP(self.req, dir + page)
def apply_data(self, object):
if not self.form:
if not hasattr(self.req, 'form'):
# no existing form, so need to create one,
# form has to be saved back to request object
# so that error page can access it if need be
self.form = util.FieldStorage(self.req, keep_blank_values=1)
self.req.form = self.form
else:
self.form = self.req.form
return util.apply_fs_data(object, self.form, req=self.req)
def redirect(self, location, permanent=0):
util.redirect(self.req, location, permanent)
class PSP:
code = None
dbmcache = None
def __init__(self, req, filename=None, string=None, vars={}):
if (string and filename):
raise ValueError("Must specify either filename or string")
self.req, self.vars = req, vars
if not filename and not string:
filename = req.filename
self.filename, self.string = filename, string
if filename:
# if filename is not absolute, default to our guess
# of current directory
if not os.path.isabs(filename):
base = os.path.split(req.filename)[0]
self.filename = os.path.join(base, filename)
self.load_from_file()
else:
cached = mem_scache.get(string)
if cached:
self.code = cached
else:
source = _psp.parsestring(string)
code = compile(source, "__psp__", "exec")
mem_scache.store(string,code)
self.code = code
def cache_get(self, filename, mtime):
opts = self.req.get_options()
if "mod_python.psp.cache_database_filename" in opts:
self.dbmcache = opts["mod_python.psp.cache_database_filename"]
elif "PSPDbmCache" in opts:
# For backwards compatability with versions
# of mod_python prior to 3.3.
self.dbmcache = opts["PSPDbmCache"]
if self.dbmcache:
cached = dbm_cache_get(self.req.server, self.dbmcache,
filename, mtime)
if cached:
return cached
cached = mem_fcache.get(filename, mtime)
if cached:
return cached
def cache_store(self, filename, mtime, code):
if self.dbmcache:
dbm_cache_store(self.req.server, self.dbmcache,
filename, mtime, code)
else:
mem_fcache.store(filename, mtime, code)
def cfile_get(self, filename, mtime):
# check for a file ending with 'c' (precompiled file)
name, ext = os.path.splitext(filename)
cname = name + ext[:-1] + 'c'
if os.path.isfile(cname):
cmtime = os.path.getmtime(cname)
if cmtime >= mtime:
return str2code(open(cname).read())
def load_from_file(self):
filename = self.filename
if not os.path.isfile(filename):
raise apache.SERVER_RETURN(apache.HTTP_NOT_FOUND)
mtime = os.path.getmtime(filename)
# check cache
code = self.cache_get(filename, mtime)
# check for precompiled file
if not code:
code = self.cfile_get(filename, mtime)
# finally parse and compile
if not code:
dir, fname = path_split(self.filename)
source = _psp.parse(fname, dir)
code = compile(source, filename, "exec")
# store in cache
self.cache_store(filename, mtime, code)
self.code = code
def run(self, vars={}, flush=0):
code, req = self.code, self.req
# does this code use session?
session = None
if "session" in code.co_names:
if not hasattr(req, 'session'):
# no existing session, so need to create one,
# session has to be saved back to request object
# to avoid deadlock if error page tries to use it
req.session = session = Session.Session(req)
# does this code use form?
form = None
if "form" in code.co_names:
if not hasattr(req, 'form'):
# no existing form, so need to create one,
# form has to be saved back to request object
# so that error page can access it if need be
form = util.FieldStorage(req, keep_blank_values=1)
req.form = form
else:
form = req.form
# create psp interface object
psp = PSPInterface(req, self.filename, form)
try:
global_scope = globals().copy()
global_scope.update({"req":req, "form":form, "psp":psp})
# strictly speaking, session attribute only needs
# to be populated if referenced, but historically
# code has always populated it even if None, so
# preserve that just in case changing it breaks
# some users code
if hasattr(req, 'session'):
global_scope.update({"session":req.session})
else:
global_scope.update({"session":None})
global_scope.update(self.vars) # passed in __init__()
global_scope.update(vars) # passed in run()
class _InstanceInfo:
def __init__(self, label, file, cache):
self.label = label
self.file = file
self.cache = cache
self.children = {}
global_scope["__file__"] = req.filename
global_scope["__mp_info__"] = _InstanceInfo(
None, req.filename, None)
global_scope["__mp_path__"] = []
try:
exec(code, global_scope)
if flush:
req.flush()
# the mere instantiation of a session changes it
# (access time), so it *always* has to be saved
if hasattr(req, 'session'):
req.session.save()
except:
et, ev, etb = sys.exc_info()
if psp.error_page:
# run error page
psp.error_page.run({"exception": (et, ev, etb)}, flush)
else:
if PY2:
raise et, ev, etb
else:
raise et(ev).with_traceback(etb)
finally:
# if session was created here, unlock it and don't leave
# it behind in request object in unlocked state as it
# will just cause problems if then used by subsequent code
if session is not None:
session.unlock()
del req.session
def __str__(self):
self.req.content_type = 'text/html'
self.run()
return ""
def display_code(self):
"""
Display a niceliy HTML-formatted side-by-side of
what PSP generated next to orinial code.
"""
req, filename = self.req, self.filename
# Because of caching, source code is most often not
# available in this object, so we read it here
# (instead of trying to get it in __init__ somewhere)
dir, fname = path_split(filename)
source = open(filename).read().splitlines()
pycode = _psp.parse(fname, dir).splitlines()
source = [s.rstrip() for s in source]
pycode = [s.rstrip() for s in pycode]
req.write("<table>\n<tr>")
for s in ("", " PSP-produced Python Code:",
" %s:" % filename):
req.write("<td><tt>%s</tt></td>" % s)
req.write("</tr>\n")
n = 1
for line in pycode:
req.write("<tr>")
left = escape(line).replace("\t", " "*4).replace(" ", " ")
if len(source) < n:
right = ""
else:
right = escape(source[n-1]).replace("\t", " "*4).replace(" ", " ")
for s in ("%d. " % n,
"<font color=blue>%s</font>" % left,
" <font color=green>%s</font>" % right):
req.write("<td><tt>%s</tt></td>" % s)
req.write("</tr>\n")
n += 1
req.write("</table>\n")
def parse(filename, dir=None):
if dir:
return _psp.parse(filename, dir)
else:
return _psp.parse(filename)
def parsestring(str):
return _psp.parsestring(str)
def handler(req):
req.content_type = "text/html"
config = req.get_config()
debug = debug = int(config.get("PythonDebug", 0))
if debug and req.filename[-1] == "_":
p = PSP(req, req.filename[:-1])
p.display_code()
else:
p = PSP(req)
p.run()
return apache.OK
def dbm_cache_type(dbmfile):
global dbm_types
if dbmfile in dbm_types:
return dbm_types[dbmfile]
module = dbm.whichdb(dbmfile)
if module:
dbm_type = __import__(module)
dbm_types[dbmfile] = dbm_type
return dbm_type
else:
# this is a new file
return anydbm
def dbm_cache_store(srv, dbmfile, filename, mtime, val):
dbm_type = dbm_cache_type(dbmfile)
# NOTE: acquiring a lock for the dbm file (also applies to dbm_cache_get)
# See http://issues.apache.org/jira/browse/MODPYTHON-69
# In mod_python versions < 3.2 "pspcache" was used as the lock key.
# ie. _apache._global_lock(srv, key, index)
# Assuming there are 32 mutexes (the default in 3.1.x), "pspcache"
# will hash to one of 31 mutexes (index 0 is reserved). Therefore
# there is a 1 in 31 chance for a hash collision if a session is
# used in the same request, which would result in a deadlock. This
# has been confirmed by testing.
# We can avoid this by using index 0 and setting the key to None.
# Lock index 0 is also used by DbmSession for locking it's dbm file,
# but since the lock is not held for the duration of the request there
# should not be any additional deadlock issues. Likewise, the lock
# here is only held for a short time, so it will not interfere
# with DbmSession file locking.
_apache._global_lock(srv, None, 0)
try:
dbm = dbm_type.open(dbmfile, 'c')
dbm[filename] = "%d %s" % (mtime, code2str(val))
finally:
try: dbm.close()
except: pass
_apache._global_unlock(srv, None, 0)
def dbm_cache_get(srv, dbmfile, filename, mtime):
dbm_type = dbm_cache_type(dbmfile)
_apache._global_lock(srv, None, 0)
try:
dbm = dbm_type.open(dbmfile, 'c')
try:
entry = dbm[filename]
t, val = entry.split(" ", 1)
if int(t) == mtime:
return str2code(val)
except KeyError:
return None
finally:
try: dbm.close()
except: pass
_apache._global_unlock(srv, None, 0)
class HitsCache:
def __init__(self, size=512):
self.cache = {}
self.size = size
def store(self, key, val):
self.cache[key] = (1, val)
if len(self.cache) > self.size:
self.clean()
def get(self, key):
if key in self.cache:
hits, val = self.cache[key]
self.cache[key] = (hits+1, val)
return val
else:
return None
def clean(self):
byhits = [(n[1], n[0]) for n in list(self.cache.items())]
byhits.sort()
# delete enough least hit entries to make cache 75% full
for item in byhits[:len(self.cache)-int(self.size*.75)]:
val, key = item
del self.cache[key]
mem_scache = HitsCache()
class FileCache(HitsCache):
def store(self, filename, mtime, code):
self.cache[filename] = (1, mtime, code)
if len(self.cache) > self.size:
self.clean()
def get(self, filename, mtime):
try:
hits, c_mtime, code = self.cache[filename]
if mtime != c_mtime:
del self.cache[filename]
return None
else:
self.cache[filename] = (hits+1, mtime, code)
return code
except KeyError:
return None
mem_fcache = FileCache()
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