annotate MoinMoin/logfile/__init__.py @ 1646:2fbb179f3518

use filepos in (not mtime of) edit-log for editlog.news, fix some bugs in logfile
author Thomas Waldmann <tw AT waldmann-edv DOT de>
date Tue, 31 Oct 2006 12:22:38 +0100
parents 76a76def8687
children df984fe11783
rev   line source
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1 # -*- coding: iso-8859-1 -*-
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2 """
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3 MoinMoin - LogFile package
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4
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5 @copyright: 2005-2006 by Thomas Waldmann (MoinMoin:ThomasWaldmann)
0
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6 @license: GNU GPL, see COPYING for details.
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7 """
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8
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9 import os, codecs, errno
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10 from MoinMoin import config, wikiutil
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11
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12 class LogError(Exception):
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13 """ Base class for log errors """
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14
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15 class LogMissing(LogError):
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16 """ Raised when the log is missing """
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17
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18
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19 class LineBuffer:
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20 """
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21 Reads lines from a file
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22 self.lines list of lines (Strings)
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23 self.offsets list of offset for each line
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24 """
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25 def __init__(self, file, offset, size, forward=True):
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26 """
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27 @param file: open file object
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28 @param offset: position in file to start from
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29 @param size: aproximate number of bytes to read
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30 @param forward : read from offset on or from offset-size to offset
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31 @type forward: boolean
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32 """
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33 if forward:
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34 file.seek(offset)
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35 self.lines = file.readlines(size)
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36 self.__calculate_offsets(offset)
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37 else:
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38 if offset < 2 * size:
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39 begin = 0
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40 else:
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41 begin = offset - size
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42 file.seek(begin)
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43 self.lines = file.read(offset-begin).splitlines(True)
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44 if begin != 0:
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45 begin += len(self.lines[0])
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46 self.lines = self.lines[1:]
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47 # XXX check for min one line read
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48 self.__calculate_offsets(begin)
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49
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50 # Decode lines after offset in file is calculated
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51 self.lines = [unicode(line, config.charset) for line in self.lines]
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52 self.len = len(self.lines)
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53
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54 def __calculate_offsets(self, offset):
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55 """ Calculate the file offsets of all read lines and also the offset of
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56 the position after the last read line (stored into self.offsets[-1])
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57
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58 @param offset: offset of the first line
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59 """
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60 self.offsets = map(lambda x:len(x), self.lines)
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61 self.offsets.append(0)
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62 i = 1
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63 length = len(self.offsets)
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64 tmp = offset
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65 while i < length:
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66 result = self.offsets[i-1] + tmp
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67 tmp = self.offsets[i]
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68 self.offsets[i] = result
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69 i = i + 1
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70 self.offsets[0] = offset
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71
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72
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73 class LogFile:
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74 """
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75 .filter: function that gets the values from .parser.
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76 must return True to keep it or False to remove it
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77 Overwrite .parser() and .add() to customize this class to
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78 special log files
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79 """
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80
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81 def __init__(self, filename, buffer_size=65536):
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82 """
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83 @param filename: name of the log file
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84 @param buffer_size: approx. size of one buffer in bytes
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85 """
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86 self.buffer_size = buffer_size
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87 self.__filename = filename
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88 self.filter = None
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89 self.__lineno = 0
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90 self.__buffer = None
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91 self.__buffer1 = None
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92 self.__buffer2 = None
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93
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94 def __iter__(self):
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95 return self
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96
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97 def reverse(self):
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98 """ @rtype: iterator
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99 """
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100 self.to_end()
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101 while 1:
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102 try:
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103 result = self.previous()
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104 except StopIteration:
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105 return
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106 yield result
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107
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108 def sanityCheck(self):
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109 """ Check for log file write access.
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110
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111 TODO: os.access should not be used here.
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112
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113 @rtype: string (error message) or None
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114 """
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115 if not os.access(self.__filename, os.W_OK):
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116 return "The log '%s' is not writable!" % (self.__filename,)
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117 return None
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118
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119 def __getattr__(self, name):
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120 """
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121 generate some attributes when needed
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122 """
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123 if name == "_LogFile__rel_index":
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124 # starting iteration from begin
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125 self.__buffer1 = LineBuffer(self._input, 0, self.buffer_size)
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126 self.__buffer2 = LineBuffer(self._input,
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127 self.__buffer1.offsets[-1],
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128 self.buffer_size)
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129 self.__buffer = self.__buffer1
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130 self.__rel_index = 0
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131 return 0
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132 elif name == "_input":
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133 try:
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134 # Open the file without codecs.open, it break our offset
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135 # calculation. We decode it later.
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136 # Use binary mode in order to retain \r. Otherwise the offset
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137 # calculation would fail
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138 self._input = file(self.__filename, "rb",)
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139 except IOError:
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140 raise StopIteration
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141 return self._input
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142 elif name == "_output":
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143 self._output = codecs.open(self.__filename, 'a', config.charset)
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144 return self._output
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145 else:
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146 raise AttributeError(name)
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147
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148 def size(self):
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149 """ Return log size in bytes
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150
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151 Return 0 if the file does not exists. Raises other OSError.
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152
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153 @return: size of log file in bytes
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154 @rtype: Int
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155 """
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156 try:
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157 return os.path.getsize(self.__filename)
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158 except OSError, err:
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159 if err.errno == errno.ENOENT:
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160 return 0
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161 raise
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162
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163 def lines(self):
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164 """ Return number of lines in the log file
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165
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166 Return 0 if the file does not exists. Raises other OSError.
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167
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168 Expensive for big log files - O(n)
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169
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170 @return: size of log file in lines
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171 @rtype: Int
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172 """
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173 try:
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174 f = codecs.open(self.__filename, 'r')
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175 try:
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176 count = 0
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177 for line in f:
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178 count += 1
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179 return count
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180 finally:
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181 f.close()
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182 except (OSError, IOError), err:
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183 if err.errno == errno.ENOENT:
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184 return 0
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185 raise
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186
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187 def date(self):
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188 """ Return timestamp of log file in usecs """
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189 try:
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190 mtime = os.path.getmtime(self.__filename)
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191 except OSError, err:
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192 if err.errno == errno.ENOENT:
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193 # This can happen on fresh wiki when building the index
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194 # Usually the first request will create an event log
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195 raise LogMissing(str(err))
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196 raise
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197 return wikiutil.timestamp2version(mtime)
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198
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199 def peek(self, lines):
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200 """ What does this method do?
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201
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202 @param lines: number of lines, may be negative to move backward
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203 moves file position by lines.
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204 @return: True if moving more than (WHAT?) to the beginning and moving
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205 to the end or beyond
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206 @rtype: boolean
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207 peek adjusts .__lineno if set
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208 This function is not aware of filters!
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209 """
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210 self.__rel_index = self.__rel_index + lines
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211 while self.__rel_index < 0:
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212 if self.__buffer is self.__buffer2:
749
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213 # change to buffer 1
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214 self.__buffer = self.__buffer1
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215 self.__rel_index = self.__rel_index + self.__buffer.len
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216 else:
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217 if self.__buffer.offsets[0] == 0:
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218 # already at the beginning of the file
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219 # XXX
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220 self.__rel_index = 0
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221 self.__lineno = 0
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222 return True
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223 else:
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224 # load previous lines
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225 self.__buffer2 = self.__buffer1
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226 self.__buffer1 = LineBuffer(self._input,
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227 self.__buffer2.offsets[0],
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228 self.buffer_size,
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229 forward=False)
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230 self.__rel_index = (self.__rel_index +
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231 self.__buffer1.len)
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232 self.__buffer = self.__buffer1
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diff changeset
233
749
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234 while self.__rel_index >= self.__buffer.len:
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235 if self.__buffer is self.__buffer1:
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236 # change to buffer 2
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237 self.__rel_index = self.__rel_index - self.__buffer.len
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238 self.__buffer = self.__buffer2
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diff changeset
239 else:
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240 # try to load next buffer
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diff changeset
241 tmpbuff = LineBuffer(self._input,
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diff changeset
242 self.__buffer1.offsets[-1],
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diff changeset
243 self.buffer_size)
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diff changeset
244 if tmpbuff.len == 0:
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245 # end of file
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diff changeset
246 if self.__lineno:
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diff changeset
247 self.__lineno = (self.__lineno + lines -
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diff changeset
248 (self.__rel_index -
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diff changeset
249 len(self.__buffer.offsets)))
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250 self.__rel_index = self.__buffer.len # point to after last read line
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251 # was (wrong): ... = len(self.__buffer.offsets)
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252 return True
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253 # shift buffers
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254 self.__buffer1 = self.__buffer2
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255 self.__buffer2 = tmpbuff
749
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256 self.__rel_index = self.__rel_index - self.__buffer1.len
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257 if self.__lineno: self.__lineno += lines
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258 return False
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259
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260 def __next(self):
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261 """get next line already parsed"""
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262 if self.peek(0):
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263 raise StopIteration
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264 result = self.parser(self.__buffer.lines[self.__rel_index])
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265 self.peek(1)
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266 return result
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267
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268 def next(self):
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269 """
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270 @return: next entry
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271 raises StopIteration at file end
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272 XXX It does not raise anything!
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273 """
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274 result = None
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275 while result is None:
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276 while result is None:
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277 result = self.__next()
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278 if self.filter and not self.filter(result):
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279 result = None
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280 return result
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281
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282 def __previous(self):
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283 if self.peek(-1):
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284 raise StopIteration
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285 return self.parser(self.__buffer.lines[self.__rel_index])
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286
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287 def previous(self):
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288 """
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289 @return: previous entry and moves file position one line back
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290 raises StopIteration at file begin
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291 """
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292 result = None
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293 while result is None:
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294 while result is None:
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295 result = self.__previous()
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296 if self.filter and not self.filter(result):
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297 result = None
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298 return result
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299
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300 def to_begin(self):
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301 """moves file position to the begin"""
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302 if self.__buffer1.offsets[0] != 0:
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303 self.__buffer1 = LineBuffer(self._input,
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304 0,
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305 self.buffer_size)
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306 self.__buffer2 = LineBuffer(self._input,
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307 self.__buffer1.offsets[-1],
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308 self.buffer_size)
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309 self.__buffer = self.__buffer1
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310 self.__rel_index = 0
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311 self.__lineno = 0
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312
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313 def to_end(self):
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314 """moves file position to the end"""
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315 self._input.seek(0, 2) # to end of file
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316 size = self._input.tell()
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317 if (not self.__buffer2) or (size > self.__buffer2.offsets[-1]):
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318 self.__buffer2 = LineBuffer(self._input,
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319 size,
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320 self.buffer_size,
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321 forward=False)
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322
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323 self.__buffer1 = LineBuffer(self._input,
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324 self.__buffer2.offsets[0],
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325 self.buffer_size,
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326 forward=False)
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327 self.__buffer = self.__buffer2
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328 self.__rel_index = self.__buffer2.len
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329 self.__lineno = None
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330
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331 def position(self):
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332 """ Return the current file position
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333
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334 This can be converted into a String using back-ticks and then
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335 be rebuild.
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336 For this plain file implementation position is an Integer.
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337 """
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338 return self.__buffer.offsets[self.__rel_index]
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339
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340 def seek(self, position, line_no=None):
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341 """ moves file position to an value formerly gotten from .position().
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342 To enable line counting line_no must be provided.
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343 .seek is much more efficient for moving long distances than .peek.
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344 raises ValueError if position is invalid
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345 """
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346 if self.__buffer1 and self.__buffer1.offsets[0] <= position < self.__buffer1.offsets[-1]:
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347 # position is in .__buffer1
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348 self.__rel_index = self.__buffer1.offsets.index(position)
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349 self.__buffer = self.__buffer1
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350 elif self.__buffer2 and self.__buffer2.offsets[0] <= position < self.__buffer2.offsets[-1]:
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351 # position is in .__buffer2
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352 self.__rel_index = self.__buffer2.offsets.index(position)
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353 self.__buffer = self.__buffer2
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354 else:
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355 # load buffers around position
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356 self.__buffer1 = LineBuffer(self._input,
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357 position,
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358 self.buffer_size,
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359 forward=False)
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360 self.__buffer2 = LineBuffer(self._input,
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361 position,
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362 self.buffer_size)
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363 self.__buffer = self.__buffer2
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364 self.__rel_index = 0
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365 # XXX test for valid position
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366 self.__lineno = line_no
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367
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368 def line_no(self):
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369 """@return: the current line number or None if line number is unknown"""
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370 return self.__lineno
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371
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372 def calculate_line_no(self):
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373 """ Calculate the current line number from buffer offsets
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374
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375 If line number is unknown it is calculated by parsing the whole file.
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376 This may be expensive.
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377 """
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378 self._input.seek(0, 0)
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379 lines = self._input.read(self.__buffer.offsets[self.__rel_index])
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380 self.__lineno = len(lines.splitlines())
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381 return self.__lineno
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382
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383 def parser(self, line):
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384 """
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385 @param line: line as read from file
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386 @return: parsed line or None on error
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387 Converts the line from file to program representation
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388 This implementation uses TAB separated strings.
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389 This method should be overwritten by the sub classes.
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390 """
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391 return line.split("\t")
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392
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393 def add(self, *data):
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394 """
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395 add line to log file
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396 This implementation save the values as TAB separated strings.
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397 This method should be overwritten by the sub classes.
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398 """
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399 line = "\t".join(data)
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400 self._add(line)
1000
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401
749
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402 def _add(self, line):
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403 """
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404 @param line: flat line
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405 @type line: String
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406 write on entry in the log file
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407 """
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408 if line is not None:
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409 if line[-1] != '\n':
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410 line += '\n'
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411 self._output.write(line)
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412