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"""

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    Full-text searching of logs

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"""

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import datetime, calendar, pytz

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import HyperEstraier as hype

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import log_line

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class LogSearchIndex (object) :

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    """

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        An index on the logs for a group of channels.

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        This uses Hyper Estraier to handle searching, whereby each log line is a document (yes, I have a powerful server).

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        These log documents have the following attributes:

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            @uri        - channel/date/line

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            @channel    - channel id

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            @type       - the LogType id

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            @timestamp  - UTC timestamp

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            @source     - nickname

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        Each document then has a single line of data, which is the log message itself

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    """

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    def __init__ (self, path, mode='r') :

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        """

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            Open the database, with the given mode:

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                r       - read-only

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                w       - read-write, create if not exists

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                a       - read-write, do not create

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                *       - read-write, truncate and create new

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        """

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        # mapping of { mode -> flags }

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        mode_to_flag = {

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            'r':    hype.Database.DBREADER,

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            'w':    hype.Database.DBREADER | hype.Database.DBWRITER | hype.Database.DBCREAT,

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            '*':    hype.Database.DBREADER | hype.Database.DBWRITER | hype.Database.DBCREAT | hype.Database.DBTRUNC,

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        }

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        # look up flags

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        flags = mode_to_flag[mode]

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        # make instance

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        self.db = hype.Database()

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        # open

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        if not self.db.open(path, flags) :

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    def insert (self, channel, lines) :

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        """

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            Adds a sequence of LogLines from the given LogChannel to the index

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        """

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        # validate the LogChannel

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        assert channel.name

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        # iterate

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        for line in lines :

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            # validate the LogLine

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            assert line.offset

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            assert line.timestamp

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            # create new document

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            doc = hype.Document()

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            # line date

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            date = line.timestamp.date()

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            # convert to UTC timestamp

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            utc_timestamp = calendar.timegm(line.timestamp.utctimetuple())

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            # ensure that it's not 1900

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            assert date.year != 1900

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            # add URI

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            doc.add_attr('@uri',        "%s/%s/%d" % (channel.id, date.strftime('%Y-%m-%d'), line.offset))

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            # add channel id

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            doc.add_attr('@channel',    channel.id)

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            # add type

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            doc.add_attr('@type',       str(line.type))

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            # add UTC timestamp

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            doc.add_attr('@timestamp',  str(utc_timestamp))

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            # add source attribute?

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            if line.source :

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                doc.add_attr('@source', str(line.source))

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            # add data text

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            doc.add_text(line.data.encode('utf8'))

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            # put

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            # XXX: what does this flag mean?

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            if not self.db.put_doc(doc, hype.Database.PDCLEAN) :

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                raise Exeception("Index put_doc failed")

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    def search_cond (self, cond) :

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        """

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            Search using a raw hype.Condition

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        """

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        # execute search, unused 'flags' arg stays zero

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        results = self.db.search(cond, 0)

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        # iterate over the document IDs

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        for doc_id in results :

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            # load document, this throws an exception...

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            # option constants are hype.Database.GDNOATTR/GDNOTEXT

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            doc = self.db.get_doc(doc_id, 0)

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            # load the attributes/text

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            channel_id  = doc.attr('@channel')

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            type        = int(doc.attr('@type'))

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            timestamp   = datetime.datetime.fromtimestamp(int(doc.attr('@timestamp')), pytz.utc)

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            source      = doc.attr('@source')

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            # build+yield to (channel_id, LogLine) tuple

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            yield (channel_id, log_line.LogLine(None, type, timestamp, source, data))

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    def search_simple (self, channel, query) :

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        """

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            Search for lines from the given channel for the given simple query

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        """

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        # build condition

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        cond = hype.Condition()

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        # simplified phrase

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        cond.set_options(hype.Condition.SIMPLE)

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        # add channel attribute

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        cond.add_attr("@channel STREQ %s" % (channel.id, ))

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        # add phrase

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        cond.set_phrase(query)

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        # set order

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        cond.set_order("@timestamp NUMA")

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        # search with cond

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        for channel_id, line in self.search_cond(cond) :

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            assert channel_id == channel.id

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            yield line

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