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00756bd4a6
instance variables. Make all global functions methods, for easy overriding. Restructure getpage() for easy overriding. Add save_pickle() method and load_pickle() global function to make it easier for other programs to emulate the toplevel interface.
671 lines
17 KiB
Python
Executable file
671 lines
17 KiB
Python
Executable file
#! /usr/bin/env python
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"""Web tree checker.
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This utility is handy to check a subweb of the world-wide web for
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errors. A subweb is specified by giving one or more ``root URLs''; a
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page belongs to the subweb if one of the root URLs is an initial
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prefix of it.
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File URL extension:
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In order to easy the checking of subwebs via the local file system,
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the interpretation of ``file:'' URLs is extended to mimic the behavior
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of your average HTTP daemon: if a directory pathname is given, the
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file index.html in that directory is returned if it exists, otherwise
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a directory listing is returned. Now, you can point webchecker to the
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document tree in the local file system of your HTTP daemon, and have
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most of it checked. In fact the default works this way if your local
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web tree is located at /usr/local/etc/httpd/htdpcs (the default for
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the NCSA HTTP daemon and probably others).
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Report printed:
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When done, it reports pages with bad links within the subweb. When
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interrupted, it reports for the pages that it has checked already.
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In verbose mode, additional messages are printed during the
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information gathering phase. By default, it prints a summary of its
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work status every 50 URLs (adjustable with the -r option), and it
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reports errors as they are encountered. Use the -q option to disable
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this output.
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Checkpoint feature:
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Whether interrupted or not, it dumps its state (a Python pickle) to a
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checkpoint file and the -R option allows it to restart from the
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checkpoint (assuming that the pages on the subweb that were already
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processed haven't changed). Even when it has run till completion, -R
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can still be useful -- it will print the reports again, and -Rq prints
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the errors only. In this case, the checkpoint file is not written
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again. The checkpoint file can be set with the -d option.
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The checkpoint file is written as a Python pickle. Remember that
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Python's pickle module is currently quite slow. Give it the time it
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needs to load and save the checkpoint file. When interrupted while
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writing the checkpoint file, the old checkpoint file is not
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overwritten, but all work done in the current run is lost.
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Miscellaneous:
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- You may find the (Tk-based) GUI version easier to use. See wcgui.py.
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- Webchecker honors the "robots.txt" convention. Thanks to Skip
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Montanaro for his robotparser.py module (included in this directory)!
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The agent name is hardwired to "webchecker". URLs that are disallowed
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by the robots.txt file are reported as external URLs.
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- Because the SGML parser is a bit slow, very large SGML files are
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skipped. The size limit can be set with the -m option.
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- When the server or protocol does not tell us a file's type, we guess
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it based on the URL's suffix. The mimetypes.py module (also in this
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directory) has a built-in table mapping most currently known suffixes,
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and in addition attempts to read the mime.types configuration files in
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the default locations of Netscape and the NCSA HTTP daemon.
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- We follows links indicated by <A>, <FRAME> and <IMG> tags. We also
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honor the <BASE> tag.
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- Checking external links is now done by default; use -x to *disable*
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this feature. External links are now checked during normal
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processing. (XXX The status of a checked link could be categorized
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better. Later...)
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Usage: webchecker.py [option] ... [rooturl] ...
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Options:
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-R -- restart from checkpoint file
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-d file -- checkpoint filename (default %(DUMPFILE)s)
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-m bytes -- skip HTML pages larger than this size (default %(MAXPAGE)d)
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-n -- reports only, no checking (use with -R)
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-q -- quiet operation (also suppresses external links report)
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-r number -- number of links processed per round (default %(ROUNDSIZE)d)
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-v -- verbose operation; repeating -v will increase verbosity
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-x -- don't check external links (these are often slow to check)
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Arguments:
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rooturl -- URL to start checking
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(default %(DEFROOT)s)
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"""
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__version__ = "$Revision$"
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import sys
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import os
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from types import *
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import string
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import StringIO
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import getopt
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import pickle
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import urllib
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import urlparse
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import sgmllib
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import mimetypes
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import robotparser
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# Extract real version number if necessary
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if __version__[0] == '$':
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_v = string.split(__version__)
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if len(_v) == 3:
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__version__ = _v[1]
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# Tunable parameters
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DEFROOT = "file:/usr/local/etc/httpd/htdocs/" # Default root URL
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CHECKEXT = 1 # Check external references (1 deep)
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VERBOSE = 1 # Verbosity level (0-3)
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MAXPAGE = 150000 # Ignore files bigger than this
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ROUNDSIZE = 50 # Number of links processed per round
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DUMPFILE = "@webchecker.pickle" # Pickled checkpoint
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AGENTNAME = "webchecker" # Agent name for robots.txt parser
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# Global variables
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def main():
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checkext = CHECKEXT
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verbose = VERBOSE
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maxpage = MAXPAGE
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roundsize = ROUNDSIZE
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dumpfile = DUMPFILE
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restart = 0
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norun = 0
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try:
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opts, args = getopt.getopt(sys.argv[1:], 'Rd:m:nqr:vx')
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except getopt.error, msg:
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sys.stdout = sys.stderr
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print msg
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print __doc__%globals()
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sys.exit(2)
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for o, a in opts:
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if o == '-R':
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restart = 1
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if o == '-d':
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dumpfile = a
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if o == '-m':
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maxpage = string.atoi(a)
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if o == '-n':
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norun = 1
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if o == '-q':
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verbose = 0
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if o == '-r':
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roundsize = string.atoi(a)
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if o == '-v':
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verbose = verbose + 1
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if o == '-x':
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checkext = not checkext
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if verbose > 0:
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print AGENTNAME, "version", __version__
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if restart:
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c = load_pickle(dumpfile=dumpfile, verbose=verbose)
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else:
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c = Checker()
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c.setflags(checkext=checkext, verbose=verbose,
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maxpage=maxpage, roundsize=roundsize)
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if not restart and not args:
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args.append(DEFROOT)
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for arg in args:
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c.addroot(arg)
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if not norun:
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try:
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c.run()
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except KeyboardInterrupt:
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if verbose > 0:
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print "[run interrupted]"
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try:
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c.report()
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except KeyboardInterrupt:
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if verbose > 0:
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print "[report interrupted]"
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if c.save_pickle(dumpfile):
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if dumpfile == DUMPFILE:
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print "Use ``%s -R'' to restart." % sys.argv[0]
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else:
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print "Use ``%s -R -d %s'' to restart." % (sys.argv[0], dumpfile)
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def load_pickle(dumpfile=DUMPFILE, verbose=VERBOSE):
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if verbose > 0:
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print "Loading checkpoint from %s ..." % dumpfile
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f = open(dumpfile, "rb")
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c = pickle.load(f)
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f.close()
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if verbose > 0:
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print "Done."
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print "Root:", string.join(c.roots, "\n ")
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return c
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class Checker:
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checkext = CHECKEXT
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verbose = VERBOSE
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maxpage = MAXPAGE
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roundsize = ROUNDSIZE
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validflags = tuple(dir())
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def __init__(self):
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self.reset()
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def setflags(self, **kw):
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for key in kw.keys():
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if key not in self.validflags:
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raise NameError, "invalid keyword argument: %s" % str(key)
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for key, value in kw.items():
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setattr(self, key, value)
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def reset(self):
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self.roots = []
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self.todo = {}
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self.done = {}
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self.bad = {}
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self.round = 0
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# The following are not pickled:
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self.robots = {}
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self.errors = {}
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self.urlopener = MyURLopener()
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self.changed = 0
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def __getstate__(self):
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return (self.roots, self.todo, self.done, self.bad, self.round)
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def __setstate__(self, state):
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self.reset()
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(self.roots, self.todo, self.done, self.bad, self.round) = state
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for root in self.roots:
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self.addrobot(root)
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for url in self.bad.keys():
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self.markerror(url)
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def addroot(self, root):
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if root not in self.roots:
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troot = root
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scheme, netloc, path, params, query, fragment = \
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urlparse.urlparse(root)
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i = string.rfind(path, "/") + 1
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if 0 < i < len(path):
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path = path[:i]
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troot = urlparse.urlunparse((scheme, netloc, path,
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params, query, fragment))
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self.roots.append(troot)
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self.addrobot(root)
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self.newlink(root, ("<root>", root))
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def addrobot(self, root):
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root = urlparse.urljoin(root, "/")
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if self.robots.has_key(root): return
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url = urlparse.urljoin(root, "/robots.txt")
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self.robots[root] = rp = robotparser.RobotFileParser()
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if self.verbose > 2:
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print "Parsing", url
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rp.debug = self.verbose > 3
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rp.set_url(url)
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try:
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rp.read()
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except IOError, msg:
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if self.verbose > 1:
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print "I/O error parsing", url, ":", msg
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def run(self):
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while self.todo:
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self.round = self.round + 1
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if self.verbose > 0:
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print
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print "Round %d (%s)" % (self.round, self.status())
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print
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urls = self.todo.keys()[:self.roundsize]
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for url in urls:
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self.dopage(url)
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def status(self):
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return "%d total, %d to do, %d done, %d bad" % (
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len(self.todo)+len(self.done),
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len(self.todo), len(self.done),
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len(self.bad))
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def report(self):
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print
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if not self.todo: print "Final",
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else: print "Interim",
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print "Report (%s)" % self.status()
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self.report_errors()
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def report_errors(self):
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if not self.bad:
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print
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print "No errors"
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return
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print
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print "Error Report:"
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sources = self.errors.keys()
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sources.sort()
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for source in sources:
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triples = self.errors[source]
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print
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if len(triples) > 1:
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print len(triples), "Errors in", source
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else:
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print "Error in", source
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for url, rawlink, msg in triples:
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print " HREF", url,
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if rawlink != url: print "(%s)" % rawlink,
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print
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print " msg", msg
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def dopage(self, url):
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if self.verbose > 1:
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if self.verbose > 2:
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self.show("Check ", url, " from", self.todo[url])
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else:
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print "Check ", url
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page = self.getpage(url)
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if page:
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for info in page.getlinkinfos():
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link, rawlink = info
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origin = url, rawlink
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self.newlink(link, origin)
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self.markdone(url)
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def newlink(self, url, origin):
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if self.done.has_key(url):
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self.newdonelink(url, origin)
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else:
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self.newtodolink(url, origin)
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def newdonelink(self, url, origin):
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self.done[url].append(origin)
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if self.verbose > 3:
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print " Done link", url
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def newtodolink(self, url, origin):
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if self.todo.has_key(url):
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self.todo[url].append(origin)
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if self.verbose > 3:
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print " Seen todo link", url
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else:
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self.todo[url] = [origin]
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if self.verbose > 3:
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print " New todo link", url
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def markdone(self, url):
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self.done[url] = self.todo[url]
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del self.todo[url]
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self.changed = 1
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def inroots(self, url):
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for root in self.roots:
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if url[:len(root)] == root:
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root = urlparse.urljoin(root, "/")
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return self.robots[root].can_fetch(AGENTNAME, url)
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return 0
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def getpage(self, url):
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if url[:7] == 'mailto:' or url[:5] == 'news:':
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if self.verbose > 1: print " Not checking mailto/news URL"
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return None
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isint = self.inroots(url)
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if not isint:
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if not self.checkext:
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if self.verbose > 1: print " Not checking ext link"
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return None
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f = self.openpage(url)
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if f:
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self.safeclose(f)
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return None
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text, nurl = self.readhtml(url)
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if nurl != url:
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if self.verbose > 1:
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print " Redirected to", nurl
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url = nurl
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if text:
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return Page(text, url, verbose=self.verbose, maxpage=self.maxpage)
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def readhtml(self, url):
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text = None
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f, url = self.openhtml(url)
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if f:
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text = f.read()
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f.close()
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return text, url
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def openhtml(self, url):
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f = self.openpage(url)
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if f:
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url = f.geturl()
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info = f.info()
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if not self.checkforhtml(info, url):
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self.safeclose(f)
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f = None
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return f, url
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def openpage(self, url):
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try:
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return self.urlopener.open(url)
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except IOError, msg:
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msg = self.sanitize(msg)
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if self.verbose > 0:
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print "Error ", msg
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if self.verbose > 0:
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self.show(" HREF ", url, " from", self.todo[url])
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self.setbad(url, msg)
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return None
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def checkforhtml(self, info, url):
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if info.has_key('content-type'):
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ctype = string.lower(info['content-type'])
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else:
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if url[-1:] == "/":
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return 1
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ctype, encoding = mimetypes.guess_type(url)
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if ctype == 'text/html':
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return 1
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else:
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if self.verbose > 1:
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print " Not HTML, mime type", ctype
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return 0
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def setgood(self, url):
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if self.bad.has_key(url):
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del self.bad[url]
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self.changed = 1
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if self.verbose > 0:
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print "(Clear previously seen error)"
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def setbad(self, url, msg):
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if self.bad.has_key(url) and self.bad[url] == msg:
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if self.verbose > 0:
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print "(Seen this error before)"
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return
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self.bad[url] = msg
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self.changed = 1
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self.markerror(url)
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def markerror(self, url):
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try:
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origins = self.todo[url]
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except KeyError:
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origins = self.done[url]
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for source, rawlink in origins:
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triple = url, rawlink, self.bad[url]
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self.seterror(source, triple)
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def seterror(self, url, triple):
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try:
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self.errors[url].append(triple)
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except KeyError:
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self.errors[url] = [triple]
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# The following used to be toplevel functions; they have been
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# changed into methods so they can be overridden in subclasses.
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def show(self, p1, link, p2, origins):
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print p1, link
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i = 0
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for source, rawlink in origins:
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i = i+1
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if i == 2:
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p2 = ' '*len(p2)
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print p2, source,
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if rawlink != link: print "(%s)" % rawlink,
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print
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def sanitize(self, msg):
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if isinstance(IOError, ClassType) and isinstance(msg, IOError):
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# Do the other branch recursively
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msg.args = self.sanitize(msg.args)
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elif isinstance(msg, TupleType):
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if len(msg) >= 4 and msg[0] == 'http error' and \
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isinstance(msg[3], InstanceType):
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# Remove the Message instance -- it may contain
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# a file object which prevents pickling.
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msg = msg[:3] + msg[4:]
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return msg
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def safeclose(self, f):
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try:
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url = f.geturl()
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except AttributeError:
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pass
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else:
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if url[:4] == 'ftp:' or url[:7] == 'file://':
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# Apparently ftp connections don't like to be closed
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# prematurely...
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text = f.read()
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f.close()
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def save_pickle(self, dumpfile=DUMPFILE):
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if not self.changed:
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if self.verbose > 0:
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print
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print "No need to save checkpoint"
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elif not dumpfile:
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if self.verbose > 0:
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print "No dumpfile, won't save checkpoint"
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else:
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if self.verbose > 0:
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print
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print "Saving checkpoint to %s ..." % dumpfile
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newfile = dumpfile + ".new"
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f = open(newfile, "wb")
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pickle.dump(self, f)
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f.close()
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try:
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os.unlink(dumpfile)
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except os.error:
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pass
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os.rename(newfile, dumpfile)
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if self.verbose > 0:
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print "Done."
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return 1
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class Page:
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def __init__(self, text, url, verbose=VERBOSE, maxpage=MAXPAGE):
|
|
self.text = text
|
|
self.url = url
|
|
self.verbose = verbose
|
|
self.maxpage = maxpage
|
|
|
|
def getlinkinfos(self):
|
|
size = len(self.text)
|
|
if size > self.maxpage:
|
|
if self.verbose > 0:
|
|
print "Skip huge file", self.url
|
|
print " (%.0f Kbytes)" % (size*0.001)
|
|
return []
|
|
if self.verbose > 2:
|
|
print " Parsing", self.url, "(%d bytes)" % size
|
|
parser = MyHTMLParser(verbose=self.verbose)
|
|
parser.feed(self.text)
|
|
parser.close()
|
|
rawlinks = parser.getlinks()
|
|
base = urlparse.urljoin(self.url, parser.getbase() or "")
|
|
infos = []
|
|
for rawlink in rawlinks:
|
|
t = urlparse.urlparse(rawlink)
|
|
t = t[:-1] + ('',)
|
|
rawlink = urlparse.urlunparse(t)
|
|
link = urlparse.urljoin(base, rawlink)
|
|
infos.append((link, rawlink))
|
|
return infos
|
|
|
|
|
|
class MyStringIO(StringIO.StringIO):
|
|
|
|
def __init__(self, url, info):
|
|
self.__url = url
|
|
self.__info = info
|
|
StringIO.StringIO.__init__(self)
|
|
|
|
def info(self):
|
|
return self.__info
|
|
|
|
def geturl(self):
|
|
return self.__url
|
|
|
|
|
|
class MyURLopener(urllib.FancyURLopener):
|
|
|
|
http_error_default = urllib.URLopener.http_error_default
|
|
|
|
def __init__(*args):
|
|
self = args[0]
|
|
apply(urllib.FancyURLopener.__init__, args)
|
|
self.addheaders = [
|
|
('User-agent', 'Python-webchecker/%s' % __version__),
|
|
]
|
|
|
|
def http_error_401(self, url, fp, errcode, errmsg, headers):
|
|
return None
|
|
|
|
def open_file(self, url):
|
|
path = urllib.url2pathname(urllib.unquote(url))
|
|
if path[-1] != os.sep:
|
|
url = url + '/'
|
|
if os.path.isdir(path):
|
|
indexpath = os.path.join(path, "index.html")
|
|
if os.path.exists(indexpath):
|
|
return self.open_file(url + "index.html")
|
|
try:
|
|
names = os.listdir(path)
|
|
except os.error, msg:
|
|
raise IOError, msg, sys.exc_traceback
|
|
names.sort()
|
|
s = MyStringIO("file:"+url, {'content-type': 'text/html'})
|
|
s.write('<BASE HREF="file:%s">\n' %
|
|
urllib.quote(os.path.join(path, "")))
|
|
for name in names:
|
|
q = urllib.quote(name)
|
|
s.write('<A HREF="%s">%s</A>\n' % (q, q))
|
|
s.seek(0)
|
|
return s
|
|
return urllib.FancyURLopener.open_file(self, path)
|
|
|
|
|
|
class MyHTMLParser(sgmllib.SGMLParser):
|
|
|
|
def __init__(self, verbose=VERBOSE):
|
|
self.base = None
|
|
self.links = {}
|
|
self.myverbose = verbose
|
|
sgmllib.SGMLParser.__init__(self)
|
|
|
|
def start_a(self, attributes):
|
|
self.link_attr(attributes, 'href')
|
|
|
|
def end_a(self): pass
|
|
|
|
def do_area(self, attributes):
|
|
self.link_attr(attributes, 'href')
|
|
|
|
def do_img(self, attributes):
|
|
self.link_attr(attributes, 'src', 'lowsrc')
|
|
|
|
def do_frame(self, attributes):
|
|
self.link_attr(attributes, 'src')
|
|
|
|
def link_attr(self, attributes, *args):
|
|
for name, value in attributes:
|
|
if name in args:
|
|
if value: value = string.strip(value)
|
|
if value: self.links[value] = None
|
|
|
|
def do_base(self, attributes):
|
|
for name, value in attributes:
|
|
if name == 'href':
|
|
if value: value = string.strip(value)
|
|
if value:
|
|
if self.myverbose > 1:
|
|
print " Base", value
|
|
self.base = value
|
|
|
|
def getlinks(self):
|
|
return self.links.keys()
|
|
|
|
def getbase(self):
|
|
return self.base
|
|
|
|
|
|
if __name__ == '__main__':
|
|
main()
|