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consumer.py
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consumer.py
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import sys
#from pyndn import Name, Key
import pyndn
import logging
import datetime
from mydata import MyData, ChunkInfo, log
from mydata import DEFAULT_BLOCK_SIZE, DEFAULT_RUN_TIMEOUT
from mydata import ADAPTIVE_MOD_FLAG
import os.path
import signal
PAPER="optimal-chunk-size"
ITEM = "consumer"
class Consumer(pyndn.Closure):
def __init__(self, name, mydata, **kwargs):
self.name = pyndn.Name(name) #not include segment number and version number
self.handle = pyndn.NDN()
self.exclusions = pyndn.ExclusionFilter()
self.interest_schema = kwargs.get("interest_schema", "id")
self.mod = kwargs.get("mod", "non-adatpive")
self.default_block_size = kwargs.get("default_block_size", DEFAULT_BLOCK_SIZE)
self.mydata = mydata
s = os.path.basename(name)
if os.path.exists(s):
log.info("file %s will be replaced " %(s))
self.file_out = open(s, "w")
self.chunkinfo = None
def start(self):
log.info("consumer start, name: "+ str(self.name))
self.express_interest()
self.handle.run(-1)
def express_interest(self):
if self.chunkinfo == None:#a new chunk requested
self.chunkinfo = ChunkInfo(self.mydata.next_seg)
self.chunkinfo.begin_byte = self.mydata.next_byte
self.chunkinfo.expected_chunk_size = self.mydata.estimated_optimal_size or self.default_block_size
self.chunkinfo.beginT = datetime.datetime.now()
self.mydata.add_chunk_info(self.chunkinfo)
self.chunkinfo.retxN += 1
selector = pyndn.Interest()
selector.answerOriginKind = True
name = self.name
chunkid = self.mydata.next_seg
if self.mod == "adaptive": #byte index as chunkid
name = self.name.append(ADAPTIVE_MOD_FLAG).append(str(self.chunkinfo.expected_chunk_size))
chunkid = self.mydata.next_byte
if self.interest_schema == "exclusion": #do not use this
selector = pyndn.Interest(exclude = self.exclusions)
selector.answerOriginKind = True
elif self.interest_schema == "id":#the default one
name = pyndn.Name(name.components)
name = name.append(chunkid)
elif self.interest_schema == "segment":
name = pyndn.Name(name.components)
name = name.appendSegment(chunkid)
self.handle.expressInterest(name, self, selector)
#log.info("express interest %s, exclusions: %s" %(str(self.name), self.exclusions));
log.debug("interest=%s " %name)
def do_meet_accident(self, kind, upcallInfo):
log.warn("accident happen: kind=%s, upcallInfo=%s" %(kind, upcallInfo))
self.handle.setRunTimeout(DEFAULT_RUN_TIMEOUT)
self.express_interest()
def do_receive_content(self, kind, upcallInfo):
self.handle.setRunTimeout(DEFAULT_RUN_TIMEOUT)
self.chunkinfo.endT = datetime.datetime.now()
self.chunkinfo.content_size = len(upcallInfo.ContentObject.content)
self.chunkinfo = None
log.info("receive valid content: %s" %upcallInfo.ContentObject.name)
log.debug("receive valid content: %s" %upcallInfo.ContentObject)
self.file_out.write(upcallInfo.ContentObject.content)
fbi = upcallInfo.ContentObject.signedInfo.finalBlockID
if fbi != None:
if isinstance(fbi, str):
fbi = pyndn.Name.seg2num(fbi)
log.info("***************final block id: %s, or %s" %(upcallInfo.ContentObject.signedInfo.finalBlockID, fbi))
#log.debug("final_block_id: %s" %self.mydata.final_block_id)
#log.debug("final content: %s" %upcallInfo.ContentObject)
if self.mydata.final_block_id == None:
self.mydata.final_block_id = int(fbi)
else:
assert self.mydata.final_block_id == fbi, \
"self.mydata.final_block_id: %s != upcallInfo.ContentObject.signedInfo.finalBlockID: %s" \
%(self.mydata.final_block_id, upcallInfo.ContentObject.signedInfo.finalBlockID)
log.info("mydata.final_block_id: %s, next_seg: %s, next_byte: %s" \
%(self.mydata.final_block_id, self.mydata.next_seg, self.mydata.next_byte))
self.mydata.next_seg += 1
self.mydata.next_byte += len(upcallInfo.ContentObject.content)
self.mydata.total_size += len(upcallInfo.ContentObject.content)
if self.mydata.final_block_id !=None:
if (self.mod == "adaptive" and self.mydata.next_byte > self.mydata.final_block_id) or \
(self.mod == "non-adaptive" and self.mydata.next_seg > self.mydata.final_block_id):
log.info("**********aready get the final block")
self.stop()
return
else:
log.debug("final_block_id: %s, next_seg: %s" %(self.mydata.final_block_id, self.mydata.next_seg))
self.express_interest()
def upcall(self, kind, upcallInfo):
if kind == pyndn.UPCALL_FINAL:#handler is about to be deregistered
log.info("handler is about to be deregistered")
if self.mydata.final_block_id == None:
self.handle.setRunTimeout(DEFAULT_RUN_TIMEOUT*10)
return pyndn.RESULT_OK
if kind == pyndn.UPCALL_INTEREST_TIMED_OUT:
self.do_meet_accident(kind, upcallInfo)
return pyndn.RESULT_OK
if kind in [pyndn.UPCALL_CONTENT_UNVERIFIED, pyndn.UPCALL_CONTENT_BAD]:
self.do_meet_accident(kind, upcallInfo)
return pyndn.RESULT_OK
if kind in [pyndn.UPCALL_INTEREST, pyndn.UPCALL_CONSUMED_INTEREST]:
log.warn("unexpected kind: %s" %kind)
assert kind == pyndn.UPCALL_CONTENT, "kind: "+str(kind)
if self.interest_schema == "exclusion":
matched_comps = upcallInfo.matchedComps
response_name = upcallInfo.ContentObject.name
org_prefix = response_name[:matched_comps]
assert org_prefix == self.name, "org_prefix: "+ str(org_prefix)+" , self.name: "+str(self.name)
if matched_comps == len(response_name):
comp = pyndn.Name([upcallInfo.ContentObject.digest()])
disp_name = pyndn.Name(response_name)
else:
comp = response_name[matched_comps:matched_comps + 1]
disp_name = response_name[:matched_comps + 1]
log.info("disp_name: %s, comp: %s" %(disp_name, comp))
self.exclusions.add_name(comp)
self.do_receive_content(kind, upcallInfo)
#if matched_comps + 1 < len(response_name):
# new = Consumer(response_name[:matched_comps+1])
# new.express_interest()
return pyndn.RESULT_OK
def stop(self):
#self.mydata.list_info()
self.handle.setRunTimeout(DEFAULT_RUN_TIMEOUT/100)
return
def usage():
s = '''
python consumer <NAME> [INTEREST_SCHEMA:-i|s|e] [MOD:-a|-na] [DEFAULT_BLOCK_SIZE: -b DEFAULT_BLOCK_SIZE]
e.g.: python consumer.py /swordguy/chunksize/a -i -na -b 4096
------------------------------------------------------------
Usage:
-h: show help information
Name: make sure NAME is routable to the producer
Interest Schema: default -i
-i: use id directly in the Interest, e.g.: <name>/0, <name>/0
-e: use exclusion in the Interest, e.g.: <name> with exclusion <0,1,2>
-s: use segment in the Interest, e.g.: <name>/%FD00
Mod: default -na
-a: adapt expected optimal block size according to loss rate
-na: non-adaptive, use static block size
DEFAULT_BLOCK_SIZE: default 4096
-b DEFAULT_BLOCK_SIZE: set the default block size to DEFAULT_BLOCK_SIZE
-----------------------------------------------------------------
'''
print s
mydata = MyData()
def signal_handler(signal, frame):
print 'You pressed Ctrl+C!'
global mydata
mydata.list_info()
sys.exit(0)
if __name__ == "__main__":
if len(sys.argv) < 2 or sys.argv[1].startswith("-"):
usage()
exit(0)
name = sys.argv[1]
interest_schema = "id"
mod = "non-adaptive"
default_block_size = DEFAULT_BLOCK_SIZE
for i in range(2, len(sys.argv)):
av = sys.argv[i]
if av == "-e":#use exclusion
interest_schema = "exclusion"
elif av == "-s": #use segment
interest_schema = "segment"
elif av == "-i":#use id directly in the name
interest_schema = "id"
elif av == "-a": #adaptive mode, which adapt chunk size according to the packet loss rate
mod = "adaptive"
elif av == "-na": #adaptive mode, which adapt chunk size according to the packet loss rate
mod = "non-adaptive"
elif av == "-b": #block size
assert i <= len(sys.argv), "-b should be followed by chunk size"
i += 1
default_block_size = int(sys.argv[i])
elif av == "-h" or av == "--help":
usage()
#exit(0)
#timeout = sys.argv[2]
#global mydata
consumer = Consumer(name=name, mydata=mydata, \
interest_schema=interest_schema, mod=mod, default_block_size=default_block_size)
signal.signal(signal.SIGINT, signal_handler)
consumer.start()
mydata.list_info()
log.info("program %s:%s end" %(PAPER, ITEM))