Mercurial > repos > shellac > guppy_basecaller

annotate env/lib/python3.7/site-packages/boltons/excutils.py @ 4:79f47841a781 draft

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"planemo upload commit 2a0fe2cc28b09e101d37293e53e82f61762262ec"
author shellac
date Thu, 14 May 2020 16:47:39 -0400
parents 26e78fe6e8c4
children
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1 # -*- coding: utf-8 -*-
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2
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3 import sys
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4 import traceback
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5 import linecache
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6 from collections import namedtuple
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7
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8 # TODO: last arg or first arg? (last arg makes it harder to *args
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9 # into, but makes it more readable in the default exception
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10 # __repr__ output)
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11 # TODO: Multiexception wrapper
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12
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13
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14 __all__ = ['ExceptionCauseMixin']
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15
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16
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17 class ExceptionCauseMixin(Exception):
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18 """
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19 A mixin class for wrapping an exception in another exception, or
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20 otherwise indicating an exception was caused by another exception.
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21
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22 This is most useful in concurrent or failure-intolerant scenarios,
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23 where just because one operation failed, doesn't mean the remainder
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24 should be aborted, or that it's the appropriate time to raise
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25 exceptions.
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26
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27 This is still a work in progress, but an example use case at the
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28 bottom of this module.
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29
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30 NOTE: when inheriting, you will probably want to put the
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31 ExceptionCauseMixin first. Builtin exceptions are not good about
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32 calling super()
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33 """
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34
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35 cause = None
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36
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37 def __new__(cls, *args, **kw):
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38 cause = None
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39 if args and isinstance(args[0], Exception):
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40 cause, args = args[0], args[1:]
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41 ret = super(ExceptionCauseMixin, cls).__new__(cls, *args, **kw)
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42 ret.cause = cause
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43 if cause is None:
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44 return ret
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45 root_cause = getattr(cause, 'root_cause', None)
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46 if root_cause is None:
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47 ret.root_cause = cause
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48 else:
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49 ret.root_cause = root_cause
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50
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51 full_trace = getattr(cause, 'full_trace', None)
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52 if full_trace is not None:
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53 ret.full_trace = list(full_trace)
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54 ret._tb = list(cause._tb)
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55 ret._stack = list(cause._stack)
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56 return ret
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57
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58 try:
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59 exc_type, exc_value, exc_tb = sys.exc_info()
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60 if exc_type is None and exc_value is None:
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61 return ret
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62 if cause is exc_value or root_cause is exc_value:
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63 # handles when cause is the current exception or when
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64 # there are multiple wraps while handling the original
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65 # exception, but a cause was never provided
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66 ret._tb = _extract_from_tb(exc_tb)
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67 ret._stack = _extract_from_frame(exc_tb.tb_frame)
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68 ret.full_trace = ret._stack[:-1] + ret._tb
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69 finally:
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70 del exc_tb
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71 return ret
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72
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73 def get_str(self):
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74 """
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75 Get formatted the formatted traceback and exception
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76 message. This function exists separately from __str__()
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77 because __str__() is somewhat specialized for the built-in
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78 traceback module's particular usage.
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79 """
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80 ret = []
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81 trace_str = self._get_trace_str()
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82 if trace_str:
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83 ret.extend(['Traceback (most recent call last):\n', trace_str])
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84 ret.append(self._get_exc_str())
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85 return ''.join(ret)
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86
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87 def _get_message(self):
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88 args = getattr(self, 'args', [])
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89 if self.cause:
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90 args = args[1:]
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91 if args and args[0]:
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92 return args[0]
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93 return ''
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94
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95 def _get_trace_str(self):
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96 if not self.cause:
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97 return super(ExceptionCauseMixin, self).__repr__()
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98 if self.full_trace:
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99 return ''.join(traceback.format_list(self.full_trace))
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100 return ''
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101
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102 def _get_exc_str(self, incl_name=True):
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103 cause_str = _format_exc(self.root_cause)
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104 message = self._get_message()
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105 ret = []
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106 if incl_name:
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107 ret = [self.__class__.__name__, ': ']
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108 if message:
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109 ret.extend([message, ' (caused by ', cause_str, ')'])
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110 else:
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111 ret.extend([' caused by ', cause_str])
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112 return ''.join(ret)
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113
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114 def __str__(self):
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115 if not self.cause:
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116 return super(ExceptionCauseMixin, self).__str__()
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117 trace_str = self._get_trace_str()
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118 ret = []
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119 if trace_str:
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120 message = self._get_message()
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121 if message:
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122 ret.extend([message, ' --- '])
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123 ret.extend(['Wrapped traceback (most recent call last):\n',
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124 trace_str,
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125 self._get_exc_str(incl_name=True)])
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126 return ''.join(ret)
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127 else:
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128 return self._get_exc_str(incl_name=False)
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129
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130
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131 def _format_exc(exc, message=None):
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132 if message is None:
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133 message = exc
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134 exc_str = traceback._format_final_exc_line(exc.__class__.__name__, message)
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135 return exc_str.rstrip()
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136
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137
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138 _BaseTBItem = namedtuple('_BaseTBItem', 'filename, lineno, name, line')
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139
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140
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141 class _TBItem(_BaseTBItem):
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142 def __repr__(self):
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143 ret = super(_TBItem, self).__repr__()
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144 ret += ' <%r>' % self.frame_id
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145 return ret
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146
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147
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148 class _DeferredLine(object):
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149 def __init__(self, filename, lineno, module_globals=None):
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150 self.filename = filename
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151 self.lineno = lineno
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152 module_globals = module_globals or {}
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153 self.module_globals = dict([(k, v) for k, v in module_globals.items()
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154 if k in ('__name__', '__loader__')])
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155
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156 def __eq__(self, other):
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157 return (self.lineno, self.filename) == (other.lineno, other.filename)
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158
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159 def __ne__(self, other):
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160 return (self.lineno, self.filename) != (other.lineno, other.filename)
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161
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162 def __str__(self):
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163 if hasattr(self, '_line'):
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164 return self._line
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165 linecache.checkcache(self.filename)
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166 line = linecache.getline(self.filename,
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167 self.lineno,
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168 self.module_globals)
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169 if line:
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170 line = line.strip()
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171 else:
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172 line = None
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173 self._line = line
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174 return line
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175
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176 def __repr__(self):
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177 return repr(str(self))
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178
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179 def __len__(self):
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180 return len(str(self))
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181
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182 def strip(self):
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183 return str(self).strip()
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184
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185
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186 def _extract_from_frame(f=None, limit=None):
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187 ret = []
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188 if f is None:
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189 f = sys._getframe(1) # cross-impl yadayada
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190 if limit is None:
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191 limit = getattr(sys, 'tracebacklimit', 1000)
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192 n = 0
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193 while f is not None and n < limit:
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194 filename = f.f_code.co_filename
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195 lineno = f.f_lineno
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196 name = f.f_code.co_name
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197 line = _DeferredLine(filename, lineno, f.f_globals)
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198 item = _TBItem(filename, lineno, name, line)
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199 item.frame_id = id(f)
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200 ret.append(item)
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201 f = f.f_back
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202 n += 1
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203 ret.reverse()
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204 return ret
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205
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206
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207 def _extract_from_tb(tb, limit=None):
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208 ret = []
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209 if limit is None:
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210 limit = getattr(sys, 'tracebacklimit', 1000)
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211 n = 0
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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diff changeset
212 while tb is not None and n < limit:
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parents:
diff changeset
213 filename = tb.tb_frame.f_code.co_filename
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parents:
diff changeset
214 lineno = tb.tb_lineno
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parents:
diff changeset
215 name = tb.tb_frame.f_code.co_name
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parents:
diff changeset
216 line = _DeferredLine(filename, lineno, tb.tb_frame.f_globals)
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parents:
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217 item = _TBItem(filename, lineno, name, line)
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parents:
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218 item.frame_id = id(tb.tb_frame)
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parents:
diff changeset
219 ret.append(item)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
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220 tb = tb.tb_next
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parents:
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221 n += 1
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
222 return ret
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
223
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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224
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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225 # An Example/Prototest:
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226
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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227
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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diff changeset
228 class MathError(ExceptionCauseMixin, ValueError):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
229 pass
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
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diff changeset
230
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
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diff changeset
231
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
232 def whoops_math():
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
233 return 1/0
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
234
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
235
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
236 def math_lol(n=0):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
237 if n < 3:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
238 return math_lol(n=n+1)
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shellac
parents:
diff changeset
239 try:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
240 return whoops_math()
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
241 except ZeroDivisionError as zde:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
242 exc = MathError(zde, 'ya done messed up')
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
243 raise exc
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
244
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
245 def main():
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shellac
parents:
diff changeset
246 try:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
247 math_lol()
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
248 except ValueError as me:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
249 exc = MathError(me, 'hi')
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shellac
parents:
diff changeset
250 raise exc
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
251
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
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252
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
253 if __name__ == '__main__':
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shellac
parents:
diff changeset
254 try:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
255 main()
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
256 except Exception:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
257 import pdb;pdb.post_mortem()
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
258 raise