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1 | 1 | """Logger class for IPython's logging facilities. |
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2 | 2 | """ |
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3 | 3 | |
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4 | 4 | #***************************************************************************** |
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5 | 5 | # Copyright (C) 2001 Janko Hauser <jhauser@zscout.de> and |
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6 | 6 | # Copyright (C) 2001-2006 Fernando Perez <fperez@colorado.edu> |
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7 | 7 | # |
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8 | 8 | # Distributed under the terms of the BSD License. The full license is in |
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9 | 9 | # the file COPYING, distributed as part of this software. |
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10 | 10 | #***************************************************************************** |
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11 | 11 | |
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12 | 12 | #**************************************************************************** |
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13 | 13 | # Modules and globals |
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14 | 14 | |
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15 | 15 | # Python standard modules |
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16 | 16 | import glob |
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17 | 17 | import io |
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18 | 18 | import os |
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19 | 19 | import time |
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20 | 20 | |
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21 | 21 | |
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22 | 22 | #**************************************************************************** |
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23 | 23 | # FIXME: This class isn't a mixin anymore, but it still needs attributes from |
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24 | 24 | # ipython and does input cache management. Finish cleanup later... |
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25 | 25 | |
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26 | 26 | class Logger(object): |
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27 | 27 | """A Logfile class with different policies for file creation""" |
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28 | 28 | |
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29 | 29 | def __init__(self, home_dir, logfname='Logger.log', loghead=u'', |
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30 | 30 | logmode='over'): |
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31 | 31 | |
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32 | 32 | # this is the full ipython instance, we need some attributes from it |
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33 | 33 | # which won't exist until later. What a mess, clean up later... |
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34 | 34 | self.home_dir = home_dir |
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35 | 35 | |
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36 | 36 | self.logfname = logfname |
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37 | 37 | self.loghead = loghead |
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38 | 38 | self.logmode = logmode |
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39 | 39 | self.logfile = None |
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40 | 40 | |
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41 | 41 | # Whether to log raw or processed input |
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42 | 42 | self.log_raw_input = False |
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43 | 43 | |
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44 | 44 | # whether to also log output |
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45 | 45 | self.log_output = False |
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46 | 46 | |
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47 | 47 | # whether to put timestamps before each log entry |
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48 | 48 | self.timestamp = False |
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49 | 49 | |
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50 | 50 | # activity control flags |
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51 | 51 | self.log_active = False |
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52 | 52 | |
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53 | 53 | # logmode is a validated property |
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54 | 54 | def _set_mode(self,mode): |
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55 | 55 | if mode not in ['append','backup','global','over','rotate']: |
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56 | 56 | raise ValueError('invalid log mode %s given' % mode) |
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57 | 57 | self._logmode = mode |
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58 | 58 | |
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59 | 59 | def _get_mode(self): |
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60 | 60 | return self._logmode |
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61 | 61 | |
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62 | 62 | logmode = property(_get_mode,_set_mode) |
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63 | 63 | |
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64 | 64 | def logstart(self, logfname=None, loghead=None, logmode=None, |
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65 | 65 | log_output=False, timestamp=False, log_raw_input=False): |
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66 | 66 | """Generate a new log-file with a default header. |
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67 | 67 | |
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68 | 68 | Raises RuntimeError if the log has already been started""" |
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69 | 69 | |
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70 | 70 | if self.logfile is not None: |
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71 | 71 | raise RuntimeError('Log file is already active: %s' % |
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72 | 72 | self.logfname) |
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73 | 73 | |
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74 | 74 | # The parameters can override constructor defaults |
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75 | 75 | if logfname is not None: self.logfname = logfname |
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76 | 76 | if loghead is not None: self.loghead = loghead |
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77 | 77 | if logmode is not None: self.logmode = logmode |
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78 | 78 | |
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79 | 79 | # Parameters not part of the constructor |
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80 | 80 | self.timestamp = timestamp |
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81 | 81 | self.log_output = log_output |
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82 | 82 | self.log_raw_input = log_raw_input |
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83 | 83 | |
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84 | 84 | # init depending on the log mode requested |
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85 | 85 | isfile = os.path.isfile |
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86 | 86 | logmode = self.logmode |
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87 | 87 | |
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88 | 88 | if logmode == 'append': |
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89 | 89 | self.logfile = io.open(self.logfname, 'a', encoding='utf-8') |
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90 | 90 | |
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91 | 91 | elif logmode == 'backup': |
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92 | 92 | if isfile(self.logfname): |
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93 | 93 | backup_logname = self.logfname+'~' |
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94 | 94 | # Manually remove any old backup, since os.rename may fail |
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95 | 95 | # under Windows. |
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96 | 96 | if isfile(backup_logname): |
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97 | 97 | os.remove(backup_logname) |
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98 | 98 | os.rename(self.logfname,backup_logname) |
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99 | 99 | self.logfile = io.open(self.logfname, 'w', encoding='utf-8') |
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100 | 100 | |
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101 | 101 | elif logmode == 'global': |
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102 | 102 | self.logfname = os.path.join(self.home_dir,self.logfname) |
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103 | 103 | self.logfile = io.open(self.logfname, 'a', encoding='utf-8') |
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104 | 104 | |
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105 | 105 | elif logmode == 'over': |
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106 | 106 | if isfile(self.logfname): |
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107 | 107 | os.remove(self.logfname) |
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108 | 108 | self.logfile = io.open(self.logfname,'w', encoding='utf-8') |
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109 | 109 | |
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110 | 110 | elif logmode == 'rotate': |
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111 | 111 | if isfile(self.logfname): |
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112 | 112 | if isfile(self.logfname+'.001~'): |
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113 | 113 | old = glob.glob(self.logfname+'.*~') |
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114 | 114 | old.sort() |
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115 | 115 | old.reverse() |
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116 | 116 | for f in old: |
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117 | 117 | root, ext = os.path.splitext(f) |
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118 | 118 | num = int(ext[1:-1])+1 |
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119 | 119 | os.rename(f, root+'.'+repr(num).zfill(3)+'~') |
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120 | 120 | os.rename(self.logfname, self.logfname+'.001~') |
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121 | 121 | self.logfile = io.open(self.logfname, 'w', encoding='utf-8') |
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122 | 122 | |
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123 | 123 | if logmode != 'append': |
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124 | 124 | self.logfile.write(self.loghead) |
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125 | 125 | |
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126 | 126 | self.logfile.flush() |
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127 | 127 | self.log_active = True |
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128 | 128 | |
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129 | 129 | def switch_log(self,val): |
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130 | 130 | """Switch logging on/off. val should be ONLY a boolean.""" |
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131 | 131 | |
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132 | 132 | if val not in [False,True,0,1]: |
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133 | 133 | raise ValueError('Call switch_log ONLY with a boolean argument, ' |
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134 | 134 | 'not with: %s' % val) |
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135 | 135 | |
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136 | 136 | label = {0:'OFF',1:'ON',False:'OFF',True:'ON'} |
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137 | 137 | |
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138 | 138 | if self.logfile is None: |
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139 | 139 | print(""" |
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140 | 140 | Logging hasn't been started yet (use logstart for that). |
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141 | 141 | |
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142 | 142 | %logon/%logoff are for temporarily starting and stopping logging for a logfile |
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143 | 143 | which already exists. But you must first start the logging process with |
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144 | 144 | %logstart (optionally giving a logfile name).""") |
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145 | 145 | |
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146 | 146 | else: |
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147 | 147 | if self.log_active == val: |
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148 | 148 | print('Logging is already',label[val]) |
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149 | 149 | else: |
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150 | 150 | print('Switching logging',label[val]) |
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151 | 151 | self.log_active = not self.log_active |
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152 | 152 | self.log_active_out = self.log_active |
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153 | 153 | |
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154 | 154 | def logstate(self): |
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155 | 155 | """Print a status message about the logger.""" |
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156 | 156 | if self.logfile is None: |
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157 | 157 | print('Logging has not been activated.') |
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158 | 158 | else: |
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159 | 159 | state = self.log_active and 'active' or 'temporarily suspended' |
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160 | 160 | print('Filename :', self.logfname) |
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161 | 161 | print('Mode :', self.logmode) |
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162 | 162 | print('Output logging :', self.log_output) |
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163 | 163 | print('Raw input log :', self.log_raw_input) |
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164 | 164 | print('Timestamping :', self.timestamp) |
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165 | 165 | print('State :', state) |
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166 | 166 | |
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167 | 167 | def log(self, line_mod, line_ori): |
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168 | 168 | """Write the sources to a log. |
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169 | 169 | |
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170 | 170 | Inputs: |
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171 | 171 | |
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172 | 172 | - line_mod: possibly modified input, such as the transformations made |
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173 | 173 | by input prefilters or input handlers of various kinds. This should |
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174 | 174 | always be valid Python. |
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175 | 175 | |
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176 | 176 | - line_ori: unmodified input line from the user. This is not |
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177 | 177 | necessarily valid Python. |
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178 | 178 | """ |
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179 | 179 | |
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180 | 180 | # Write the log line, but decide which one according to the |
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181 | 181 | # log_raw_input flag, set when the log is started. |
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182 | 182 | if self.log_raw_input: |
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183 | 183 | self.log_write(line_ori) |
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184 | 184 | else: |
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185 | 185 | self.log_write(line_mod) |
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186 | 186 | |
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187 | 187 | def log_write(self, data, kind='input'): |
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188 | 188 | """Write data to the log file, if active""" |
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189 | 189 | |
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190 | 190 | #print 'data: %r' % data # dbg |
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191 | 191 | if self.log_active and data: |
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192 | 192 | write = self.logfile.write |
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193 | 193 | if kind=='input': |
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194 | 194 | if self.timestamp: |
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195 | 195 | write(time.strftime('# %a, %d %b %Y %H:%M:%S\n', time.localtime())) |
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196 | 196 | write(data) |
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197 | 197 | elif kind=='output' and self.log_output: |
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198 | 198 | odata = u'\n'.join([u'#[Out]# %s' % s |
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199 | 199 | for s in data.splitlines()]) |
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200 | 200 | write(u'%s\n' % odata) |
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201 | self.logfile.flush() | |
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201 | try: | |
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202 | self.logfile.flush() | |
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203 | except OSError: | |
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204 | print("Failed to flush the log file.") | |
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205 | print( | |
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206 | f"Please check that {self.logfname} exists and have the right permissions." | |
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207 | ) | |
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208 | print( | |
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209 | "Also consider turning off the log with `%logstop` to avoid this warning." | |
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210 | ) | |
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202 | 211 | |
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203 | 212 | def logstop(self): |
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204 | 213 | """Fully stop logging and close log file. |
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205 | 214 | |
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206 | 215 | In order to start logging again, a new logstart() call needs to be |
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207 | 216 | made, possibly (though not necessarily) with a new filename, mode and |
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208 | 217 | other options.""" |
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209 | 218 | |
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210 | 219 | if self.logfile is not None: |
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211 | 220 | self.logfile.close() |
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212 | 221 | self.logfile = None |
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213 | 222 | else: |
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214 | 223 | print("Logging hadn't been started.") |
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215 | 224 | self.log_active = False |
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216 | 225 | |
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217 | 226 | # For backwards compatibility, in case anyone was using this. |
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218 | 227 | close_log = logstop |
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