author | Tero Marttila <terom@fixme.fi> |
Tue, 10 Feb 2009 03:22:43 +0200 | |
changeset 80 | a0662cff1d9d |
parent 74 | 1ab95857d584 |
child 87 | 39915772f090 |
permissions | -rw-r--r-- |
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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 LogSearchError (Exception) : |
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""" |
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General search error |
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""" |
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|
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pass |
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class NoResultsFound (LogSearchError) : |
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""" |
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No results found |
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""" |
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pass |
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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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|
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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.DBWRITER | hype.Database.DBCREAT, |
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'a': hype.Database.DBWRITER, |
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'*': 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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raise Exception("Index open failed: %s, mode=%s, flags=%#06x: %s" % (path, mode, flags, self.db.err_msg(self.db.error()))) |
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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, and return the number of added items |
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""" |
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# validate the LogChannel |
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assert channel.name |
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count = 0 |
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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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|
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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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# count |
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count += 1 |
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# return |
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return count |
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||
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def search_cond (self, cond) : |
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""" |
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Search using a raw hype.Condition. Raises NoResultsFound if there aren't any results |
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""" |
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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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# no results? |
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if not results : |
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raise NoResultsFound() |
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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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data = doc.cat_texts().decode('utf8') |
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# build+yield to as LogLine |
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# XXX: ignore channel_id for now |
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yield log_line.LogLine(None, type, timestamp, source, data) |
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def search (self, options=None, channel=None, phrase=None, order=None, max=None, skip=None) : |
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""" |
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Search with flexible parameters |
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options - bitmask of hype.Condition.* |
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channel - LogChannel object |
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phrase - the search query phrase |
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order - order attribute expression |
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max - number of results to return |
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skip - number of results to skip |
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""" |
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|
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# build condition |
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cond = hype.Condition() |
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|
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if options : |
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# set options |
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cond.set_options(options) |
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if channel : |
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# add channel attribute |
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cond.add_attr("@channel STREQ %s" % (channel.id, )) |
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|
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if phrase : |
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# add phrase |
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cond.set_phrase(phrase) |
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|
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if order : |
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# set order |
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cond.set_order(order) |
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|
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if max : |
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# set max |
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cond.set_max(max) |
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if skip : |
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# set skip |
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cond.set_skip(skip) |
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# execute |
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return self.search_cond(cond) |
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def search_simple (self, channel, query, count=None, offset=None) : |
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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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|
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# use search(), backwards |
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results = list(self.search( |
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# simplified phrase |
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options = hype.Condition.SIMPLE, |
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# specific channel |
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channel = channel, |
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# given phrase |
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phrase = query, |
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# order by timestamp |
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order = "@timestamp NUMD", |
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# count/offset |
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max = count, |
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skip = offset, |
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)) |
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# reverse |
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return reversed(results) |
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