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382 lines (336 loc) · 10.5 KB
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#*********************************************************************************************#
#*********************************************************************************************#
#******************witten by Neil Hao(nbaoping@cisco.com), 2013/05/19*************************#
#*********************************************************************************************#
#*********************************************************************************************#
#*********************************************************************************************#
import logging
import sys
from base import *
class SamplerArgs( object ):
def __init__( self, startTime, endTime, pace, bufTime, numThres, flush_cb, obj ):
self.startTime = startTime
self.endTime = endTime
self.pace = pace
self.bufTime = bufTime
self.numThres = numThres
self.flush_cb = flush_cb
self.cbobj = obj
def __str__( self ):
return str( self.__dict__ )
class Sampler( object ):
def __init__( self, args ):
if args.pace == 0:
raise Exception( 'sampler not support zero pace' )
logging.info( 'create sampler with args:'+str(args) )
self.slist1 = None
self.slist2 = None
self.reset( args )
self.flush_cb = args.flush_cb
self.cbobj = args.cbobj
num = args.bufTime / args.pace
if num > args.numThres:
num = args.numThres
elif num < 1:
num = 1
self.__total = num * 2
self.__buf1 = [0] * num
self.__buf2 = [0] * num
self.slist1 = self.__buf1
self.slist2 = self.__buf2
def reset( self, args ):
self.args = args
if args.startTime < 0:
args.startTime = 0
self.startTime = int(args.startTime)
logging.info( 'reset sample, start time:'+str_seconds(self.startTime) )
self.orgStartTime = int(args.startTime)
self.pace = args.pace
self.endTime = int(args.endTime)
if self.endTime > 0 and self.endTime < self.startTime:
raise Exception( 'endTime < startTime error' )
self.maxTime = -1
self.minTime = -1
self.totalCount1 = 0 #for the first list
self.totalCount2 = 0 #for the second list
self.tailIdx = -1
if self.endTime > 0 and self.pace > 0:
self.tailIdx = int( (self.endTime- self.startTime) / self.pace ) + 1
#check if needs to init the list
if self.slist1 is not None:
self.__init_list( self.slist1 )
if self.slist2 is not None:
self.__init_list( self.slist2 )
def __stat_cur_time( self, stime, etime ):
if etime > self.maxTime:
self.maxTime = etime
if self.minTime <= 0 or stime < self.minTime:
self.minTime = stime
#@return:
# -1: failed
# 0: success
# 1: failed but full
def add_sample( self, time, value ):
time = int(time)
if time < self.orgStartTime:
return 0 #should ignore all samples earlier than origion start time
if self.endTime > 0 and time > self.endTime:
return -1
idx = 0
if self.pace > 0:
idx = int( (time - self.startTime) / self.pace )
if idx < 0:
return -1
ret = self.__add_sample( idx, value )
if ret == 1:
self.__flush_buffer()
#try again
ret = self.__add_sample( idx, value )
if ret == 0:
self.__stat_cur_time( time, time )
return ret
def add_samples( self, startTime, value, num ):
startTime = int(startTime)
etime = startTime + (num-1)*self.pace
if etime < self.orgStartTime:
return 0 #should ignore all samples earlier than origion start time
idx = 0
if self.pace > 0:
idx = int( (startTime - self.startTime) / self.pace )
tail = num + idx
if self.tailIdx > 0 and tail > self.tailIdx:
return -1
if idx < 0:
if tail < 0:
return -1
idx = 0
count = 0
while idx < tail:
if self.__add_sample( idx, value ) == 1:
self.__flush_buffer()
#try again
if self.__add_sample( idx, value ) != 0:
return count
idx += 1
count += 1
self.__stat_cur_time( startTime, etime )
return 0
def flush( self ):
if self.is_empty():
return
self.__flush_buffer()
self.__flush_buffer()
def __add_sample( self, idx, value ):
logging.debug( 'add sample,idx:'+str(idx)+',tailIdx:'+str(self.tailIdx)+',value:'+str(value) )
if idx >= self.__total:
return 1
size = self.__total / 2
if idx >= size:
idx -= size
self.slist2[idx] = self.slist2[idx] + value
self.totalCount2 += 1
else:
self.slist1[idx] = self.slist1[idx] + value
self.totalCount1 += 1
return 0
def size( self ):
return self.totalCount1 + self.totalCount2
def is_empty( self ):
return self.size() == 0
def __flush_buffer( self ):
logging.info( 'minTime:'+str_seconds(self.minTime)+',maxTime:'+str_seconds(self.maxTime)+ \
',totalCount1:'+str(self.totalCount1)+',totalCount2:'+str(self.totalCount2)+\
',list len:'+str(len(self.slist1)) )
curList = self.slist1
#must call before change the status of the sampler
if self.totalCount1 > 0:
self.flush_cb( self.cbobj, self, curList )
else:
logging.info( 'the curList is empty, no need to flush' )
if self.pace > 0:
self.startTime += self.pace * self.__total / 2
self.slist1 = self.slist2
self.slist2 = curList
self.totalCount1 = self.totalCount2
self.totalCount2 = 0
self.__clear_buffer( curList )
def __clear_buffer( self, blist ):
self.__init_list( blist )
def __init_list( self, blist ):
idx = 0
size = len(blist)
while idx < size:
blist[idx] = 0
idx += 1
class MutableSampler( BaseObject ):
def __init__( self, args, init_value, update_value ):
if args.pace == 0:
raise Exception( 'sampler not support zero pace' )
logging.info( 'create sampler, with args:'+str(args) )
self.slist1 = None
self.slist2 = None
self.reset( args )
self.flush_cb = args.flush_cb
self.cbobj = args.cbobj
self.init_value = init_value
self.update_value = update_value
num = args.bufTime / args.pace
if num > args.numThres:
num = args.numThres
elif args.pace < 0:
num = 1
else:
num = 1000
self.__total = num * 2
self.__buf1 = [0] * num
self.__buf2 = [0] * num
self.slist1 = self.__buf1
self.slist2 = self.__buf2
self.__init_list( self.slist1, True )
self.__init_list( self.slist2, True )
def reset( self, args ):
self.args = args
if args.startTime < 0:
args.startTime = 0
self.startTime = int(args.startTime)
self.orgStartTime = int(args.startTime)
self.pace = args.pace
self.endTime = int(args.endTime)
if self.endTime > 0 and self.endTime < self.startTime:
raise Exception( 'endTime < startTime error' )
self.tailIdx = -1
if self.endTime > 0 and self.pace > 0:
self.tailIdx = int( (self.endTime- self.startTime) / self.pace ) + 1
self.maxTime = -1
self.minTime = -1
self.totalCount1 = 0 #for the first list
self.totalCount2 = 0 #for the second list
#check if needs to init the list
if self.slist1 is not None:
self.__init_list( self.slist1 )
if self.slist2 is not None:
self.__init_list( self.slist2 )
def __stat_cur_time( self, stime, etime ):
if etime > self.maxTime:
self.maxTime = etime
if self.minTime <= 0 or stime < self.minTime:
self.minTime = stime
#@return:
# -1: failed
# 0: success
# 1: failed but full
def add_sample( self, time, value ):
time = int(time)
if time < self.orgStartTime:
return 0 #should ignore all samples earlier than origion start time
if self.endTime > 0 and time > self.endTime:
return -1
idx = 0
if self.pace > 0:
idx = int( (time - self.startTime) / self.pace )
if idx < 0:
logging.debug( 'old time:'+str_seconds(time)+',startTime:'+str_seconds(self.startTime) )
return -1
#if idx is out of the buffer, reset the buffer to the current sample
if idx > self.__total*2:
logging.info( 'out of buffer, idx:'+str(idx)+',tail:'+str(self.__total) )
self.flush()
self.startTime = time
idx = 0
ret = self.__add_sample( idx, value )
if ret == 1:
self.__flush_buffer()
#try again
ret = self.add_sample( time, value )
if ret == 1:
logging.error( 'failed to add sample, idx:'+str(idx)+',total:'+str(self.__total) )
elif ret == 0:
self.__stat_cur_time( time, time )
return ret
def add_samples( self, startTime, value, num ):
startTime = int(startTime)
etime = startTime + (num-1)*self.pace
if etime < self.orgStartTime:
return 0 #should ignore all samples earlier than origion start time
idx = 0
if self.pace > 0:
idx = int( (startTime - self.startTime) / self.pace )
tail = num + idx
if self.tailIdx > 0 and tail > self.tailIdx:
return -1
if idx < 0:
if tail < 0:
return -1
idx = 0
count = 0
while idx < tail:
if self.__add_sample( idx, value ) == 1:
self.__flush_buffer()
#try again
if self.__add_sample( idx, value ) != 0:
return count
idx += 1
count += 1
self.__stat_cur_time( startTime, etime )
return 0
def flush( self ):
if self.is_empty():
return
self.__flush_buffer()
self.__flush_buffer()
def __add_sample( self, idx, value ):
logging.debug( 'add sample,idx:'+str(idx)+',tailIdx:'+str(self.tailIdx)+',value:'+str(value) )
if idx >= self.__total:
return 1
size = self.__total / 2
if idx >= size:
idx -= size
oldValue = self.slist2[idx]
newValue = self.update_value( self.cbobj, oldValue, value )
self.slist2[idx] = newValue
self.totalCount2 += 1
else:
oldValue = self.slist1[idx]
newValue = self.update_value( self.cbobj, oldValue, value )
self.slist1[idx] = newValue
self.totalCount1 += 1
return 0
def size( self ):
return self.totalCount1 + self.totalCount2
def is_empty( self ):
return self.size() == 0
def __flush_buffer( self ):
logging.info( 'minTime:'+str_seconds(self.minTime)+',maxTime:'+str_seconds(self.maxTime)+ \
',totalCount1:'+str(self.totalCount1)+',totalCount2:'+str(self.totalCount2)+\
',list len:'+str(len(self.slist1)) )
curList = self.slist1
#must call before change the status of the sampler
if self.totalCount1 > 0:
self.flush_cb( self.cbobj, self, curList )
else:
logging.info( 'the curList is empty, no need to flush' )
if self.pace > 0:
self.startTime += self.pace * self.__total / 2
self.slist1 = self.slist2
self.slist2 = curList
self.totalCount1 = self.totalCount2
self.totalCount2 = 0
self.__clear_buffer( curList )
def __clear_buffer( self, blist ):
self.__init_list( blist )
def __init_list( self, blist, create = False ):
idx = 0
size = len(blist)
while idx < size:
value = blist[idx]
if create:
value = self.init_value( self.cbobj, None )
else:
value = self.init_value( self.cbobj, value )
blist[idx] = value
idx += 1
def __str__( self ):
ss = 'startTime:' + str(self.startTime) + '->'+str_seconds(self.startTime)+'\t'
ss += 'endTime:' + str(self.endTime) + '->'+str_seconds(self.endTime)+'\t'
ss += 'pace:' + str(self.pace)
return ss