<s> from . filter import Filter <EOL> import logging <EOL> import time <EOL> from . . statistics import mean , percentile , stddev <EOL> from . . util import Periodic , get_path <EOL> from . . event import Event <EOL> from pprint import pformat <EOL> class Stats ( Filter ) : <EOL> """<STR_LIT>""" <EOL> def __init__ ( self , period = <NUM_LIT:5> , metrics = None , zero = True ) : <EOL> super ( Stats , self ) . __init__ ( ) <EOL> self . metrics = metrics or { } <EOL> self . zero = zero <EOL> self . timers = { } <EOL> self . last = time . time ( ) <EOL> self . periodic = Periodic ( period , self . flush ) <EOL> def process ( self , event ) : <EOL> for output , path in self . metrics . iteritems ( ) : <EOL> values = get_path ( event , path ) <EOL> for key , value in values : <EOL> if isinstance ( value , ( int , float ) ) : <EOL> self . _process_value ( event , output , key , value ) <EOL> def _process_value ( self , event , output , v , value ) : <EOL> try : <EOL> k = event . format ( output , [ v ] , raise_missing = True ) <EOL> try : <EOL> self . timers [ k ] . add ( value ) <EOL> except KeyError : <EOL> self . timers [ k ] = Timer ( ) <EOL> self . timers [ k ] . add ( value ) <EOL> except KeyError : <EOL> pass <EOL> def start ( self ) : <EOL> super ( Stats , self ) . start ( ) <EOL> self . periodic . start ( ) <EOL> def stop ( self ) : <EOL> self . periodic . kill ( ) <EOL> self . periodic . join ( ) <EOL> super ( Stats , self ) . stop ( ) <EOL> def flush ( self ) : <EOL> count = <NUM_LIT:0> <EOL> now = time . time ( ) <EOL> period = now - self . last <EOL> for k , timer in self . timers . iteritems ( ) : <EOL> stats = timer . stats ( period , self . zero ) <EOL> if stats : <EOL> count += <NUM_LIT:1> <EOL> if self . output : <EOL> self . output . put ( Event ( tags = [ '<STR_LIT>' ] , metric = k , stats = stats ) ) <EOL> if self . logger . isEnabledFor ( logging . DEBUG ) : <EOL> self . logger . debug ( '<STR_LIT>' % ( k , pformat ( stats ) ) ) <EOL> timer . reset ( ) <EOL> if count : <EOL> self . logger . debug ( '<STR_LIT>' % count ) <EOL> self . last = now <EOL> class Timer ( object ) : <EOL> def __init__ ( self ) : <EOL> self . values = [ ] <EOL> def add ( self , v ) : <EOL> self . values . append ( v ) <EOL> def stats ( self , period , zero ) : <EOL> if self . values or zero : <EOL> d = { } <EOL> d [ '<STR_LIT:count>' ] = len ( self . values ) <EOL> d [ '<STR_LIT>' ] = d [ '<STR_LIT:count>' ] / period <EOL> d [ '<STR_LIT>' ] = mean ( self . values ) <EOL> self . values . sort ( ) <EOL> d [ '<STR_LIT>' ] = percentile ( self . values , <NUM_LIT:0.0> ) <EOL> d [ '<STR_LIT>' ] = percentile ( self . values , <NUM_LIT:0.5> ) <EOL> d [ '<STR_LIT>' ] = percentile ( self . values , <NUM_LIT> ) <EOL> d [ '<STR_LIT>' ] = percentile ( self . values , <NUM_LIT> ) <EOL> d [ '<STR_LIT>' ] = percentile ( self . values , <NUM_LIT:1.0> ) <EOL> d [ '<STR_LIT>' ] = stddev ( self . values , d [ '<STR_LIT>' ] ) <EOL> return d <EOL> return None <EOL> def reset ( self ) : <EOL> self . values [ : ] = [ ] </s>
