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view roundup/cgi/cgitb.py @ 6565:2c2dbfc332ba

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Try to handle multiple connections better. The session database is a hot spot. When multiple requests (e.g. 20) come in at the same time session database contention can get great. The original code didn't retry session database access when the open failed. This resulted in errors at the client. The second pass delayed 0.01 seconds and retried. It was better but we still had multiple second stalls. I think the first request got in, everybody else backed up and then retried at the same time. Again they stepped on each other. With logging I would see many counters go all the way to low single digits or to -1 indicating falure. This pass uses randomint to generate delays from 0-.125 seconds in 5ms increments. This performs better in testing. I rarely saw a counter less than 13 (2 failed retries). Current logging starts after 6 failures and counts down until success or failure.
author John Rouillard <rouilj@ieee.org>
date Thu, 16 Dec 2021 20:02:00 -0500
parents 70e6b053193b
children 3129d73e8535
line wrap: on
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#
# This module was written by Ka-Ping Yee, <ping@lfw.org>.
#

"""Extended CGI traceback handler by Ka-Ping Yee, <ping@lfw.org>.
"""
from __future__ import print_function
__docformat__ = 'restructuredtext'

import sys, os, keyword, linecache, tokenize, inspect
import pydoc, traceback

from roundup.anypy.html import html_escape

from roundup.cgi import TranslationService
from roundup.anypy.strings import s2b


def get_translator(i18n=None):
    """Return message translation function (gettext)

    Parameters:
        i18n - translation service, such as roundup.i18n module
            or TranslationService object.

    Return ``gettext`` attribute of the ``i18n`` object, if available
    (must be a message translation function with one argument).
    If ``gettext`` cannot be obtained from ``i18n``, take default
    TranslationService.

    """
    try:
        return i18n.gettext
    except AttributeError:
        return TranslationService.get_translation().gettext


def breaker():
    return ('<body bgcolor="white">' +
            '<font color="white" size="-5"> > </font> ' +
            '</table>' * 5)


def niceDict(indent, dict):
    l = []
    for k in sorted(dict):
        v = dict[k]
        l.append('<tr><td><strong>%s</strong></td><td>%s</td></tr>' % (k,
            html_escape(repr(v))))
    return '\n'.join(l)


def pt_html(context=5, i18n=None):
    _ = get_translator(i18n)
    esc = html_escape
    exc_info = [esc(str(value)) for value in sys.exc_info()[:2]]
    l = [_('<h1>Templating Error</h1>\n'
           '<p><b>%(exc_type)s</b>: %(exc_value)s</p>\n'
           '<p class="help">Debugging information follows</p>'
           ) % {'exc_type': exc_info[0], 'exc_value': exc_info[1]},
         '<ol>', ]
    from roundup.cgi.PageTemplates.Expressions import TraversalError
    t = inspect.trace(context)
    t.reverse()
    for frame, file, lnum, func, lines, index in t:
        args, varargs, varkw, locals = inspect.getargvalues(frame)
        if '__traceback_info__' in locals:
            ti = locals['__traceback_info__']
            if isinstance(ti, TraversalError):
                s = []
                for name, info in ti.path:
                    s.append(_('<li>"%(name)s" (%(info)s)</li>')
                             % {'name': name, 'info': esc(repr(info))})
                s = '\n'.join(s)
                l.append(_('<li>Looking for "%(name)s", '
                           'current path:<ol>%(path)s</ol></li>'
                          ) % {'name': ti.name, 'path': s})
            else:
                l.append(_('<li>In %s</li>') % esc(str(ti)))
        if '__traceback_supplement__' in locals:
            ts = locals['__traceback_supplement__']
            if len(ts) == 2:
                supp, context = ts
                s = _('A problem occurred in your template "%s".') \
                    % str(context.id)
                if context._v_errors:
                    s = s + '<br>' + '<br>'.join(
                        [esc(x) for x in context._v_errors])
                l.append('<li>%s</li>' % s)
            elif len(ts) == 3:
                supp, context, info = ts
                l.append(_('''
<li>While evaluating the %(info)r expression on line %(line)d
<table class="otherinfo" style="font-size: 90%%">
 <tr><th colspan="2" class="header">Current variables:</th></tr>
 %(globals)s
 %(locals)s
</table></li>
''') % {
    'info': info,
    'line': context.position[0],
    'globals': niceDict('    ', context.global_vars),
    'locals': niceDict('    ', context.local_vars)
})

    l.append('''
</ol>
<table style="font-size: 80%%; color: gray">
 <tr><th class="header" align="left">%s</th></tr>
 <tr><td><pre>%s</pre></td></tr>
</table>''' % (_('Full traceback:'), html_escape(''.join(
        traceback.format_exception(*sys.exc_info())
    ))))
    l.append('<p>&nbsp;</p>')
    return '\n'.join(l)


def html(context=5, i18n=None):
    _ = get_translator(i18n)
    etype, evalue = sys.exc_info()[0], sys.exc_info()[1]
    if type(etype) is type:
        etype = etype.__name__
    pyver = 'Python ' + sys.version.split()[0] + '<br>' + sys.executable
    head = pydoc.html.heading(
        _('<font size=+1><strong>%(exc_type)s</strong>: %(exc_value)s</font>')
        % {'exc_type': etype, 'exc_value': evalue},
        '#ffffff', '#777777', pyver)

    head = head + (_('<p>A problem occurred while running a Python script. '
                     'Here is the sequence of function calls leading up to '
                     'the error, with the most recent (innermost) call first. '
                     'The exception attributes are:'))

    indent = '<tt><small>%s</small>&nbsp;</tt>' % ('&nbsp;' * 5)
    traceback = []
    for frame, file, lnum, func, lines, index in inspect.trace(context):
        if file is None:
            link = _("&lt;file is None - probably inside <tt>eval</tt> "
                     "or <tt>exec</tt>&gt;")
        else:
            file = os.path.abspath(file)
            link = '<a href="file:%s">%s</a>' % (file, pydoc.html.escape(file))
        args, varargs, varkw, locals = inspect.getargvalues(frame)
        if func == '?':
            call = ''
        else:
            call = _('in <strong>%s</strong>') % \
                   func + inspect.formatargvalues(
                       args, varargs, varkw, locals,
                       formatvalue=lambda value: '=' + pydoc.html.repr(value))

        level = '''
<table width="100%%" bgcolor="#dddddd" cellspacing=0 cellpadding=2 border=0>
<tr><td>%s %s</td></tr></table>''' % (link, call)

        if index is None or file is None:
            traceback.append('<p>' + level)
            continue

        # do a file inspection
        names = []

        def tokeneater(type, token, start, end, line, names=names):
            if type == tokenize.NAME and token not in keyword.kwlist:
                if token not in names:
                    names.append(token)
            if type == tokenize.NEWLINE: raise IndexError

        def linereader(file=file, lnum=[lnum]):
            line = s2b(linecache.getline(file, lnum[0]))
            lnum[0] = lnum[0] + 1
            return line

        # The interface that is tokenize.tokenize in Python 3 is
        # called tokenize.generate_tokens in Python 2.  However,
        # Python 2 has tokenize.tokenize with a different interface,
        # and Python 3 has an undocumented generate_tokens function,
        # also with a different interface, so a version check is
        # needed instead of checking for which functions exist.
        if sys.version_info[0] > 2:
            tokenize_fn = tokenize.tokenize
        else:
            tokenize_fn = tokenize.generate_tokens
        try:
            for t in tokenize_fn(linereader):
                tokeneater(*t)
        except IndexError:
            pass
        lvals = []
        for name in names:
            if name in frame.f_code.co_varnames:
                if name in locals:
                    value = pydoc.html.repr(locals[name])
                else:
                    value = _('<em>undefined</em>')
                name = '<strong>%s</strong>' % name
            else:
                if name in frame.f_globals:
                    value = pydoc.html.repr(frame.f_globals[name])
                else:
                    value = _('<em>undefined</em>')
                name = '<em>global</em> <strong>%s</strong>' % name
            lvals.append('%s&nbsp;= %s' % (name, value))
        if lvals:
            lvals = ', '.join(lvals)
            lvals = indent + '<small><font color="#909090">%s'\
                '</font></small><br>' % lvals
        else:
            lvals = ''

        excerpt = []
        i = lnum - index
        for line in lines:
            number = '&nbsp;' * (5-len(str(i))) + str(i)
            number = '<small><font color="#909090">%s</font></small>' % number
            line = '<tt>%s&nbsp;%s</tt>' % (number, pydoc.html.preformat(line))
            if i == lnum:
                line = '''
<table width="100%%" bgcolor="white" cellspacing=0 cellpadding=0 border=0>
<tr><td>%s</td></tr></table>''' % line
            excerpt.append('\n' + line)
            if i == lnum:
                excerpt.append(lvals)
            i = i + 1
        traceback.append('<p>' + level + '\n'.join(excerpt))

    traceback.reverse()

    exception = '<p><strong>%s</strong>: %s' % (str(etype), str(evalue))
    attribs = []
    for name in dir(evalue):
        value = pydoc.html.repr(getattr(evalue, name))
        attribs.append('<br>%s%s&nbsp;= %s' % (indent, name, value))

    return head + ' '.join(attribs) + ' '.join(traceback) + '<p>&nbsp;</p>'


def handler():
    print(breaker())
    print(html())

# vim: set filetype=python ts=4 sw=4 et si :
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