terom@50: """
terom@50:     Miscellaneous things
terom@50: """
terom@50: 
terom@72: import datetime, calendar, pytz
terom@50: 
terom@51: from qmsk.web.urltree import URLType
terom@51: 
terom@51: class URLChannelName (URLType) :
terom@50:     """
terom@51:         Handle LogChannel names in URLs. Deals with instances of LogChannel
terom@50:     """
terom@50: 
terom@51:     def __init__ (self, channels) :
terom@50:         """
terom@51:             Use the given { name -> LogChannel } dict
terom@51:         """
terom@51: 
terom@51:         self.channels = channels
terom@51:     
terom@51:     def parse (self, chan_name) :
terom@51:         """
terom@51:             chan_name -> LogChannel
terom@51:         """
terom@51: 
terom@51:         return self.channels[chan_name]
terom@51: 
terom@51:     def build (self, chan) :
terom@51:         """
terom@51:             LogChannel -> chan_name
terom@51:         """
terom@51: 
terom@51:         return chan.id
terom@51: 
terom@51: class URLDateType (URLType) :
terom@51:     """
terom@51:         Handle dates in URLs as naive datetime objects (with indeterminate time info)
terom@51:     """
terom@51: 
terom@51:     def __init__ (self, date_fmt="%Y-%m-%d") :
terom@51:         """
terom@51:             Format/parse dates using the given format
terom@51:         """
terom@51: 
terom@51:         self.date_fmt = date_fmt
terom@51:     
terom@51:     def parse (self, date_str) :
terom@51:         """
terom@51:             date_str -> naive datetime.datetime
terom@50:         """
terom@50:         
terom@51:         return datetime.datetime.strptime(date_str, self.date_fmt)
terom@50:     
terom@51:     def build (self, date) :
terom@51:         """
terom@51:             datetime.date -> date_str
terom@51:         """
terom@50: 
terom@51:         return date.strftime(self.date_fmt)
terom@50: 
terom@72: class URLTimestampType (URLType) :
terom@72:     """
terom@72:         Handles an integer UNIX timestamp as an UTC datetime
terom@72:     """
terom@72: 
terom@72:     def parse (self, timestamp_str) :
terom@72:         """
terom@72:             timestamp_str -> pytz.utc datetime.datetime
terom@72:         """
terom@72: 
terom@72:         return datetime.datetime.utcfromtimestamp(int(timestamp_str)).replace(tzinfo=pytz.utc)
terom@72:     
terom@72:     def build (self, dtz) :
terom@72:         """
terom@72:             pytz.utc datetime.datetime -> timestamp_str
terom@72:         """
terom@72: 
terom@72:         return str(calendar.timegm(dtz.utctimetuple()))
terom@72: