| 1 |
11
|
aaronmk
|
# Exception handling
|
| 2 |
|
|
|
| 3 |
1371
|
aaronmk
|
import copy
|
| 4 |
433
|
aaronmk
|
import atexit
|
| 5 |
343
|
aaronmk
|
import sys
|
| 6 |
1368
|
aaronmk
|
import traceback
|
| 7 |
13
|
aaronmk
|
|
| 8 |
989
|
aaronmk
|
import format
|
| 9 |
343
|
aaronmk
|
import strings
|
| 10 |
826
|
aaronmk
|
import term
|
| 11 |
343
|
aaronmk
|
import util
|
| 12 |
|
|
|
| 13 |
445
|
aaronmk
|
def raise_(e): raise e
|
| 14 |
|
|
|
| 15 |
1371
|
aaronmk
|
def sys_traceback():
|
| 16 |
|
|
'''Note that Python tracebacks seems to have a bug that truncates them to
|
| 17 |
|
|
only a few stack frames. See <http://bugs.python.org/issue7378>.'''
|
| 18 |
|
|
return sys.exc_info()[2]
|
| 19 |
|
|
# can't just return pointer to traceback because it will change :-(
|
| 20 |
1368
|
aaronmk
|
|
| 21 |
1576
|
aaronmk
|
def has_tracebacks(e): return hasattr(e, 'tracebacks')
|
| 22 |
1368
|
aaronmk
|
|
| 23 |
1371
|
aaronmk
|
def add_traceback(e):
|
| 24 |
|
|
'''Adds current traceback to an exception if it doesn't already have one'''
|
| 25 |
|
|
traceback_ = sys_traceback() # get first in case later code throws exception
|
| 26 |
1576
|
aaronmk
|
if not has_tracebacks(e): e.tracebacks = []
|
| 27 |
|
|
if util.list_get(e.tracebacks, 0) == traceback_: return
|
| 28 |
|
|
e.tracebacks.insert(0, traceback_) # tracebacks have most recent call last
|
| 29 |
1371
|
aaronmk
|
|
| 30 |
1576
|
aaronmk
|
def get_traceback_str(traceback_):
|
| 31 |
1371
|
aaronmk
|
return ''.join(traceback.format_exception(None, None, traceback_)[:-1])
|
| 32 |
|
|
# remove final "None" line ("exception name")
|
| 33 |
|
|
|
| 34 |
1576
|
aaronmk
|
def get_e_tracebacks_str(e):
|
| 35 |
|
|
try: tracebacks = e.tracebacks
|
| 36 |
|
|
except AttributeError: return ''
|
| 37 |
|
|
return ''.join(get_traceback_str(t) for t in tracebacks)
|
| 38 |
|
|
|
| 39 |
2342
|
aaronmk
|
def add_msg(e, msg):
|
| 40 |
|
|
e.args = (strings.ensure_newl(strings.ustr(e))+strings.ustr(msg),)
|
| 41 |
343
|
aaronmk
|
|
| 42 |
2246
|
aaronmk
|
def repl_msg(e, **repls): e.args = (strings.ustr(e) % repls,)
|
| 43 |
279
|
aaronmk
|
|
| 44 |
974
|
aaronmk
|
def e_ct_exit_status(e_ct): return min(e_ct, 255)
|
| 45 |
|
|
|
| 46 |
13
|
aaronmk
|
class ExceptionWithCause(Exception):
|
| 47 |
2144
|
aaronmk
|
def __init__(self, msg, cause=None, cause_newline=False):
|
| 48 |
1610
|
aaronmk
|
add_traceback(self)
|
| 49 |
2144
|
aaronmk
|
if cause != None:
|
| 50 |
|
|
if cause_newline: msg += '\ncause'
|
| 51 |
|
|
msg += ': '+str_(cause)
|
| 52 |
13
|
aaronmk
|
Exception.__init__(self, msg)
|
| 53 |
343
|
aaronmk
|
|
| 54 |
2308
|
aaronmk
|
def str_(e, first_line_only=False):
|
| 55 |
2372
|
aaronmk
|
if isinstance(e, SyntaxError):
|
| 56 |
|
|
# format_exception_only() provides special formatting for SyntaxErrors.
|
| 57 |
|
|
msg = u''.join(traceback.format_exception_only(type(e), e))
|
| 58 |
|
|
else:
|
| 59 |
|
|
# Avoid traceback exception-formatting functions because they escape
|
| 60 |
|
|
# non-ASCII characters with \x, causing exception parsers to read an
|
| 61 |
|
|
# incorrect, escaped value.
|
| 62 |
|
|
msg = util.class_name(e)+': '+e.args[0]
|
| 63 |
|
|
|
| 64 |
2308
|
aaronmk
|
if first_line_only: msg = msg.partition('\n')[0]
|
| 65 |
2372
|
aaronmk
|
return msg.rstrip()
|
| 66 |
433
|
aaronmk
|
|
| 67 |
2045
|
aaronmk
|
def print_ex(e, emph=True, detail=True, plain=False):
|
| 68 |
|
|
if plain:
|
| 69 |
|
|
emph = False
|
| 70 |
|
|
detail = False
|
| 71 |
1938
|
aaronmk
|
|
| 72 |
|
|
msg = str_(e)+'\n'
|
| 73 |
2045
|
aaronmk
|
if detail: msg += get_e_tracebacks_str(e)
|
| 74 |
826
|
aaronmk
|
if emph:
|
| 75 |
|
|
first_line, nl, rest = msg.partition('\n')
|
| 76 |
|
|
msg = term.error(first_line)+nl+rest
|
| 77 |
|
|
sys.stderr.write(msg)
|
| 78 |
788
|
aaronmk
|
|
| 79 |
433
|
aaronmk
|
class ExTracker:
|
| 80 |
|
|
def __init__(self):
|
| 81 |
|
|
self.e_ct = 0
|
| 82 |
|
|
|
| 83 |
974
|
aaronmk
|
def msg(self): return 'Encountered '+str(self.e_ct)+' error(s)'
|
| 84 |
|
|
|
| 85 |
433
|
aaronmk
|
def track(self, e, **format):
|
| 86 |
|
|
self.e_ct += 1
|
| 87 |
|
|
print_ex(e, **format)
|
| 88 |
985
|
aaronmk
|
|
| 89 |
|
|
def exit(self):
|
| 90 |
|
|
if self.e_ct > 0: raise SystemExit(e_ct_exit_status(self.e_ct))
|
| 91 |
975
|
aaronmk
|
|
| 92 |
|
|
class ExPercentTracker(ExTracker):
|
| 93 |
983
|
aaronmk
|
def __init__(self, iter_text='iteration'):
|
| 94 |
977
|
aaronmk
|
ExTracker.__init__(self)
|
| 95 |
983
|
aaronmk
|
self.iter_text = iter_text
|
| 96 |
977
|
aaronmk
|
self.iter_ct = None
|
| 97 |
1616
|
aaronmk
|
self.err_iter_ct = None
|
| 98 |
|
|
self.last_iter_num = None
|
| 99 |
975
|
aaronmk
|
|
| 100 |
977
|
aaronmk
|
def add_iters(self, iter_ct):
|
| 101 |
|
|
if self.iter_ct == None: self.iter_ct = 0
|
| 102 |
|
|
self.iter_ct += iter_ct
|
| 103 |
|
|
|
| 104 |
1616
|
aaronmk
|
def track(self, e, iter_num=None, **format):
|
| 105 |
|
|
if iter_num != None:
|
| 106 |
|
|
if iter_num != self.last_iter_num: # a new iter produced an error
|
| 107 |
|
|
if self.err_iter_ct == None: self.err_iter_ct = 0
|
| 108 |
|
|
self.err_iter_ct += 1
|
| 109 |
|
|
self.last_iter_num = iter_num
|
| 110 |
|
|
ExTracker.track(self, e, **format)
|
| 111 |
|
|
|
| 112 |
977
|
aaronmk
|
def msg(self):
|
| 113 |
|
|
msg = ExTracker.msg(self)
|
| 114 |
1616
|
aaronmk
|
iter_text_plural = self.iter_text+'(s)'
|
| 115 |
|
|
numerator = self.e_ct
|
| 116 |
|
|
if self.err_iter_ct != None:
|
| 117 |
1618
|
aaronmk
|
msg += ' in '+format.int2str(self.err_iter_ct)
|
| 118 |
1616
|
aaronmk
|
numerator = self.err_iter_ct
|
| 119 |
1648
|
aaronmk
|
if self.iter_ct != None and self.iter_ct > 0:
|
| 120 |
1616
|
aaronmk
|
msg += ('/'+format.int2str(self.iter_ct)+' '+iter_text_plural+' = '
|
| 121 |
|
|
+format.to_percent(float(numerator)/self.iter_ct))
|
| 122 |
977
|
aaronmk
|
return msg
|
