Skip to content
Navigation Menu
{{ message }}
forked from grisha/mod_python
-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathpsp.py
More file actions
470 lines (364 loc) · 14.1 KB
/
Copy pathpsp.py
File metadata and controls
470 lines (364 loc) · 14.1 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
# 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
# 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:
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()
You can’t perform that action at this time.