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1 """ |
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2 Miscellaneous things |
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3 """ |
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4 |
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5 import datetime, calendar, pytz |
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6 import os, errno |
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7 |
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8 from qmsk.web.urltree import URLType |
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9 |
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10 class URLChannelName (URLType) : |
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11 """ |
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12 Handle LogChannel names in URLs. Deals with instances of LogChannel |
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13 """ |
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14 |
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15 def __init__ (self, channels) : |
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16 """ |
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17 Use the given { name -> LogChannel } dict |
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18 """ |
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19 |
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20 self.channels = channels |
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21 |
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22 def parse (self, chan_name) : |
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23 """ |
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24 chan_name -> LogChannel |
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25 """ |
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26 |
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27 return self.channels[chan_name] |
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28 |
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29 def build (self, chan) : |
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30 """ |
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31 LogChannel -> chan_name |
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32 """ |
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33 |
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34 return chan.id |
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35 |
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36 class URLDateType (URLType) : |
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37 """ |
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38 Handle dates in URLs as naive datetime objects (with indeterminate time info) |
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39 """ |
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40 |
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41 def __init__ (self, date_fmt) : |
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42 """ |
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43 Format/parse dates using the given format |
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44 """ |
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45 |
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46 self.date_fmt = date_fmt |
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47 |
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48 def parse (self, date_str) : |
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49 """ |
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50 date_str -> naive datetime.datetime |
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51 """ |
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52 |
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53 return datetime.datetime.strptime(date_str, self.date_fmt) |
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54 |
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55 def build (self, date) : |
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56 """ |
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57 datetime.date -> date_str |
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58 """ |
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59 |
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60 return date.strftime(self.date_fmt) |
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61 |
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62 class URLTimestampType (URLType) : |
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63 """ |
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64 Handles an integer UNIX timestamp as an UTC datetime |
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65 """ |
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66 |
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67 def parse (self, timestamp_str) : |
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68 """ |
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69 timestamp_str -> pytz.utc datetime.datetime |
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70 """ |
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71 |
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72 return from_utc_timestamp(int(timestamp_str)) |
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73 |
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74 def build (self, dtz) : |
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75 """ |
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76 pytz.utc datetime.datetime -> timestamp_str |
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77 """ |
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78 |
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79 return str(to_utc_timestamp(dtz)) |
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80 |
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81 def from_utc_timestamp (timestamp) : |
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82 """ |
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83 Converts a UNIX timestamp into a datetime.datetime |
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84 """ |
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85 |
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86 return datetime.datetime.utcfromtimestamp(timestamp).replace(tzinfo=pytz.utc) |
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87 |
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88 def to_utc_timestamp (dt) : |
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89 """ |
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90 Converts a datetime.datetime into a UNIX timestamp |
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91 """ |
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92 |
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93 return calendar.timegm(dt.utctimetuple()) |
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94 |
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95 def mtime (path, ignore_missing=False) : |
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96 """ |
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97 Gets the mtime for the given path as an UTC datetime, or None, if the file doesn't exist and ignore_missing |
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98 """ |
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99 |
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100 try : |
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101 # stat |
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102 st = os.stat(path) |
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103 |
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104 # trap IOError |
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105 except os.error, e : |
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106 # ENOENT? |
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107 if ignore_missing and e.errno == errno.ENOENT : |
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108 return None |
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109 |
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110 else : |
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111 raise |
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112 |
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113 else : |
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114 # decode |
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115 return from_utc_timestamp(st.st_mtime) |
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116 |
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117 class FixedOffsetTimezone (pytz._FixedOffset) : |
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118 """ |
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119 A Fixed-offset timezone with no DST info, compatible with pytz. |
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120 |
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121 This is based on pytz._FixedOffset, but overrides dst() to return timedelta(0) |
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122 """ |
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123 |
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124 def __init__ (self, minutes) : |
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125 """ |
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126 Minutes is simply the offset from UTC in minutes, positive or negative, at most 24h. |
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127 """ |
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128 |
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129 pytz._FixedOffset.__init__(self, minutes) |
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130 |
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131 def dst (self, dt) : |
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132 """ |
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133 No DST info |
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134 """ |
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135 |
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136 return datetime.timedelta(0) |
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137 |