def current_function(self):
"""
Thread reads the current requests and generates the prefetch requests
that determines the next segment for all the current fetched bitrates.
We use a separate prefetch queue to ensure that the prefetch does not affect the performance
of the current requests
"""
config_cdash.LOG.info('Current Thread: Started thread. Stop value = {}'.format(self.stop.is_set()))
while not self.stop.is_set():
try:
current_request, username, session_id = self.current_queue.get(timeout=None)
config_cdash.LOG.info('Retrieved the file: {}'.format(current_request))
except Queue.Empty:
config_cdash.LOG.error('Current Thread: Thread GET returned Empty value')
current_request = None
continue
# Determining the next bitrates and adding to the prefetch list
if current_request:
if config_cdash.PREFETCH_SCHEME == 'SMART':
throughput = get_throughput_info(username, session_id, config_cdash.LIMIT, config_cdash.SCHEME)
config_cdash.LOG.info('average of throughput: = {}'.format(throughput))
prefetch_request, prefetch_bitrate = get_prefetch(current_request, config_cdash.PREFETCH_SCHEME, throughput)
else:
prefetch_request, prefetch_bitrate = get_prefetch(current_request, config_cdash.PREFETCH_SCHEME, None)
if not segment_exists(prefetch_request):
config_cdash.LOG.info('Segment not there {}'.format(prefetch_request))
if check_content_server(prefetch_request):
config_cdash.LOG.info('Current Thread: Current segment: {}, Next segment: {}'.format(current_request,
prefetch_request))
self.prefetch_queue.put(prefetch_request)
config_cdash.LOG.info('Pre-fetch queue count = {}'.format(self.prefetch_queue.qsize()))
else:
config_cdash.LOG.info('Current Thread: Invalid Next segment: {}'.format(current_request, prefetch_request))
else:
config_cdash.LOG.info('Segment already there {}'.format(prefetch_request))
else:
config_cdash.LOG.warning('Current Thread: terminated')
def current_function(self):
"""
Thread reads the current requests and generates the prefetch requests
that determines the next segment for all the current fetched bitrates.
We use a separate prefetch queue to ensure that the prefetch does not affect the performance
of the current requests
"""
config_cdash.LOG.info('Current Thread: Started thread. Stop value = {}'.format(self.stop.is_set()))
while not self.stop.is_set():
try:
current_request, username, session_id = self.current_queue.get(timeout=None)
config_cdash.LOG.info('Retrieved the file: {}'.format(current_request))
except Queue.Empty:
config_cdash.LOG.error('Current Thread: Thread GET returned Empty value')
current_request = None
continue
# Determining the next bitrates and adding to the prefetch list
if current_request:
if config_cdash.PREFETCH_SCHEME == 'SMART':
a=0.8
d=0.2
config_cdash.LOG.info('smart')
throughput_client= self.get_throughput_client(username, session_id)
if throughput_client== None:
config_cdash.LOG.info('throughput client:=None')
throughput= self.get_throughput_info(username, session_id, config_cdash.LIMIT, config_cdash.SCHEME)
config_cdash.LOG.info('average of throughput: = {}'.format(throughput))
forecast_throughput=throughput
self.insert_forecast(username, session_id,0.0)
self.insert_trend(username, session_id,0.0)
config_cdash.LOG.info('forecast throughput equal throughput:= {}'.format(forecast_throughput))
prefetch_request, prefetch_bitrate = get_prefetch(current_request, config_cdash.PREFETCH_SCHEME,forecast_throughput)
else:
config_cdash.LOG.info('throughput client:= {}'.format(throughput_client))
At_1=float(throughput_client)
config_cdash.LOG.info('type of At_1:= {}'.format(type(At_1)))
FIT_t_1=self.get_previous_forecast(username, session_id)
config_cdash.LOG.info('previous forecast:= {}'.format(FIT_t_1))
config_cdash.LOG.info('type of FIT_t_1:= {}'.format(type(FIT_t_1)))
Tt_1=self.get_previous_trend(username, session_id)
config_cdash.LOG.info('previous trend:= {}'.format(Tt_1))
config_cdash.LOG.info('type of Tt_1:= {}'.format(type(Tt_1)))
Ft=FIT_t_1+a*(At_1-FIT_t_1)
Tt=Tt_1+d*(Ft-FIT_t_1)
FIT_t=Ft+Tt
self.insert_forecast(username, session_id,FIT_t)
self.insert_trend(username, session_id,Tt)
config_cdash.LOG.info('forecast throughput: {}'.format(FIT_t))
prefetch_request, prefetch_bitrate = get_prefetch(current_request, config_cdash.PREFETCH_SCHEME,FIT_t)
else:
prefetch_request, prefetch_bitrate = get_prefetch(current_request, config_cdash.PREFETCH_SCHEME, None)
config_cdash.LOG.info('not smart')
if not segment_exists(prefetch_request):
config_cdash.LOG.info('Segment not there {}'.format(prefetch_request))
if check_content_server(prefetch_request):
t=type(prefetch_request)
config_cdash.LOG.info('Type will be saved in queue: {}'.format(t))
config_cdash.LOG.info('Current Thread: Current segment: {}, Next segment: {}'.format(current_request,
prefetch_request))
self.prefetch_queue.put(prefetch_request)
self.backup_prefetch_queue.put(prefetch_request)
config_cdash.LOG.info('Pre-fetch queue count = {}'.format(self.prefetch_queue.qsize()))
else:
config_cdash.LOG.info('Current Thread: Invalid Next segment: {}'.format(current_request, prefetch_request))
else:
config_cdash.LOG.info('Segment already there {}'.format(prefetch_request))
else:
config_cdash.LOG.warning('Current Thread: terminated')
def do_GET(self):
"""Function to handle the get message"""
start_time=time.time()
config_cdash.LOG.info('T2 = {}'.format(start_time))
entry_id = username = session_id = request_id = "NULL"
request_size = throughput = request_time=request_t =time_c= "NULL"
segment_size=seg_time="NULL"
try:
username = self.headers['Username']
config_cdash.LOG.info("username {}".format(username))
session_id = self.headers['Session-ID']
config_cdash.LOG.info("Session-ID {}".format(session_id))
if self.headers['Time']:
time_c=self.headers['Time']
else:
time_c=0
config_cdash.LOG.info("time_c {}".format(time_c))
global client_throughput
client_throughput=self.headers['Throughput']
if client_throughput==None:
client_throughput=0.0
if client_throughput=='NULL':
client_throughput=0.0
config_cdash.LOG.info("Client Throughput {}".format(client_throughput))
segment_size = self.headers['segment_size']
config_cdash.LOG.info("segment_size {}".format(segment_size))
seg_time = self.headers['seg_time']
config_cdash.LOG.info("seg_time {}".format(seg_time))
#global client_throughput
#client_throughput=self.headers['Throughput']
#if client_throughput==None:
# client_throughput=0.0
#if client_throughput=='NULL':
# client_throughput=0.0
#config_cdash.LOG.info("Client Throughput {}".format(client_throughput))
except KeyError:
config_cdash.LOG.warning('Could not find the username or session-ID for request from host:{}'.format(
self.client_address))
#start_time=time.time()
#config_cdash.LOG.info('T2 = {}'.format(start_time))
#s_time=str(datetime.datetime.time(datetime.datetime.now()))
global MPD_DICT
request = self.path.strip("/").split('?')[0]
config_cdash.LOG.info("Received request {}".format(request))
# check if mpd file requested is in Cache Server (dictionary)
if request in MPD_DICT:
config_cdash.LOG.info('Found MPD in MPD_DICT')
request_path = request.replace('/', os.path.sep)
make_sure_path_exists(config_cdash.MPD_FOLDER)
local_mpd_path = os.path.join(config_cdash.MPD_FOLDER, request_path)
for header in self.headers:
config_cdash.LOG.info(header)
self.send_response(HTTP_OK)
for header, header_value in MPD_DICT[request]['http_headers'].items():
self.send_header(header, header_value)
self.end_headers()
with open(local_mpd_path, 'rb') as request_file:
#start_time = timeit.default_timer()
self.wfile.write(request_file.read())
# Elapsed time in seconds
T3=time.time()
request_t = T3 - start_time
config_cdash.LOG.info('T3 = {}'.format(T3))
config_cdash.LOG.info('Served the MPD file from the cache server')
request_size = stat(local_mpd_path).st_size
elif request in config_cdash.MPD_SOURCE_LIST:
config_cdash.LOG.info("MPD: not in cache. Retrieving from Content server".format(request))
# if mpd is in content server save it in cache server and put it in MPD_DICT and json file
mpd_headers = None
if "Big" in request:
mpd_url = config_cdash.CONTENT_SERVER +config_cdash.SERVER[0]+ request
elif "Elephants" in request:
mpd_url = config_cdash.CONTENT_SERVER +config_cdash.SERVER[1]+ request
elif "OfForest" in request:
mpd_url = config_cdash.CONTENT_SERVER +config_cdash.SERVER[2]+ request
elif "Tears" in request:
mpd_url = config_cdash.CONTENT_SERVER +config_cdash.SERVER[3]+ request
#mpd_url = config_cdash.CONTENT_SERVER + request
try:
content_server_response = urllib2.urlopen(mpd_url)
mpd_headers = content_server_response.headers
config_cdash.LOG.info('Fetching MPD from {}'.format(mpd_url))
except urllib2.HTTPError as http_error:
config_cdash.LOG.error('Unable to fetch MPD file from the content server url {}. HTTPError: {}'.format(
mpd_url, http_error.code))
request_path = request.replace('/', os.path.sep)
local_mpd_path = os.path.join(config_cdash.MPD_FOLDER, request_path)
make_sure_path_exists(os.path.dirname(local_mpd_path))
with open(local_mpd_path, 'wb') as local_mpd_file:
shutil.copyfileobj(content_server_response, local_mpd_file)
config_cdash.LOG.info('Downloaded the MPD: {} to {}'.format(content_server_response, local_mpd_path))
self.send_response(HTTP_OK)
for header, header_value in mpd_headers.items():
self.send_header(header, header_value)
self.end_headers()
with open(local_mpd_path, 'rb') as request_file:
#start_time = timeit.default_timer()
self.wfile.write(request_file.read())
# Elapsed time in seconds
T3=time.time()
request_t = T3 - start_time
config_cdash.LOG.info('T3 = {}'.format(T3))
# file_size in bytes
request_size = stat(local_mpd_path).st_size
config_cdash.LOG.info('Served MPD file:{}'.format(local_mpd_path))
# client_ip, client_port = self.client_address
mpd_headers_dict = dict(mpd_headers)
config_cdash.LOG.info('Parsing MPD file')
parse_mpd(local_mpd_path, request, mpd_headers_dict, (username, session_id ))
elif 'm4s' in request:
# Check if it is a valid request
config_cdash.LOG.info('Request for m4s {}'.format(request))
if check_content_server(request):
local_file_path, http_headers = cache_manager.fetch_file(request, username, session_id)
T3=time.time()
request_t = T3 - start_time
config_cdash.LOG.info('T3 = {}'.format(T3))
#cache_manager.current_queue.put((request, username, session_id))
config_cdash.LOG.debug('M4S request: local {}, http_headers: {}'.format(local_file_path, http_headers))
self.send_response(HTTP_OK)
for header, header_value in http_headers.items():
self.send_header(header, header_value)
self.end_headers()
with open(local_file_path, 'rb') as request_file:
#start_time = timeit.default_timer()
self.wfile.write(request_file.read())
#T3=time.time()
#request_t = T3 - start_time
#config_cdash.LOG.info('T3 = {}'.format(T3))
request_size = stat(local_file_path).st_size
# If valid request sent
entry_id = datetime.datetime.now()
cursor = TH_CONN.cursor()
#Client_transfer=abs(float(time_c)-start_time)
#FMT = '%H:%M:%S.%f'
#Client_transfer = datetime.datetime.strptime(s_time, FMT) - datetime.datetime.strptime(time_c, FMT)
#secs = Client_transfer.total_seconds()
if time_c=='NULL':
time_c=0
Client_transfer=0
else:
Client_transfer=abs(float(time_c)-start_time)
config_cdash.LOG.info('sent header time {}'.format(time_c))
config_cdash.LOG.info('start time {}'.format(start_time))
config_cdash.LOG.info('Client transfer time {}'.format(Client_transfer))
config_cdash.LOG.info('request time {}'.format(request_t))
if request_t=='NULL':
request_t=0.0
if request_size=='NULL':
request_size=0.0
request_size = float(request_size)*8
config_cdash.LOG.info('transfer size:{} '.format(request_size))
request_time=float(request_t+(Client_transfer*2))
throughput = float(request_size)/(request_time)
#config_cdash.LOG.info('Adding row to Throughput database : '
# 'INSERT INTO THROUGHPUTDATA VALUES ({}, {}, {}, {}, {}, {}, {}, {},{},{});'.format(entry_id, username, session_id, request_id, request_size, request_time, throughput ,client_throughput,'None','None'))
#cursor.execute('INSERT INTO THROUGHPUTDATA(ENTRYID, USERNAME, SESSIONID, REQUESTSIZE, REQUESTTIME, THROUGHPUT, C_THROUGHPUT) '
# 'VALUES (?,?, ?, ?, ?, ?, ?);', (entry_id, username, session_id, request_size, request_time,throughput,client_throughput))
#TH_CONN.commit()
cache_manager.list_data.append((entry_id, username, session_id, request_size, request_time,throughput,client_throughput,None,None))
#config_cdash.LOG.info('list_data in the begining:{} '.format(cache_manager.list_data))
cache_manager.current_queue.put((request, username, session_id))
else:
config_cdash.LOG.warning('Invalid video file request: {}'.format(request))
else:
self.send_response(HTTP_NOT_FOUND)
config_cdash.LOG.warning('Could not find file {}'.format(request))
return
def do_GET(self):
"""Function to handle the get message"""
entry_id = username = session_id = request_id = "NULL"
request_size = throughput = request_time = "NULL"
try:
username = self.headers['Username']
session_id = self.headers['Session-ID']
except KeyError:
config_cdash.LOG.warning('Could not find the username or session-ID for request from host:{}'.format(
self.client_address))
global MPD_DICT
request = self.path.strip("/").split('?')[0]
# check if mpd file requested is in Cache Server (dictionary)
if request in MPD_DICT:
config_cdash.LOG.info('Found MPD in MPD_DICT')
request_path = request.replace('/', os.path.sep)
make_sure_path_exists(config_cdash.MPD_FOLDER)
local_mpd_path = os.path.join(config_cdash.MPD_FOLDER, request_path)
for header in self.headers:
config_cdash.LOG.info(header)
self.send_response(HTTP_OK)
for header, header_value in MPD_DICT[request]['http_headers'].items():
self.send_header(header, header_value)
self.end_headers()
with open(local_mpd_path, 'rb') as request_file:
start_time = timeit.default_timer()
self.wfile.write(request_file.read())
# Elapsed time in seconds
request_time = timeit.default_timer() - start_time
config_cdash.LOG.info('Served the MPD file from the cache server')
request_size = stat(local_mpd_path).st_size
elif request in config_cdash.MPD_SOURCE_LIST:
config_cdash.LOG.info("MPD: not in cache. Retrieving from Content server".format(request))
# if mpd is in content server save it in cache server and put it in MPD_DICT and json file
mpd_headers = None
mpd_url = config_cdash.CONTENT_SERVER + request
try:
content_server_response = urllib2.urlopen(mpd_url)
mpd_headers = content_server_response.headers
config_cdash.LOG.info('Fetching MPD from {}'.format(mpd_url))
except urllib2.HTTPError as http_error:
config_cdash.LOG.error('Unable to fetch MPD file from the content server url {}. HTTPError: {}'.format(
mpd_url, http_error.code))
request_path = request.replace('/', os.path.sep)
local_mpd_path = os.path.join(config_cdash.MPD_FOLDER, request_path)
make_sure_path_exists(os.path.dirname(local_mpd_path))
with open(local_mpd_path, 'wb') as local_mpd_file:
shutil.copyfileobj(content_server_response, local_mpd_file)
config_cdash.LOG.info('Downloaded the MPD: {} to {}'.format(content_server_response, local_mpd_path))
self.send_response(HTTP_OK)
for header, header_value in mpd_headers.items():
self.send_header(header, header_value)
self.end_headers()
with open(local_mpd_path, 'rb') as request_file:
start_time = timeit.default_timer()
self.wfile.write(request_file.read())
# Elapsed time in seconds
request_time = timeit.default_timer() - start_time
# file_size in bytes
request_size = stat(local_mpd_path).st_size
config_cdash.LOG.info('Served MPD file:{}'.format(local_mpd_path))
# client_ip, client_port = self.client_address
mpd_headers_dict = dict(mpd_headers)
config_cdash.LOG.info('Parsing MPD file')
parse_mpd(local_mpd_path, request, mpd_headers_dict, (username, session_id ))
elif 'm4s' in request:
# Check if it is a valid request
config_cdash.LOG.info('Request for m4s {}'.format(request))
if check_content_server(request):
local_file_path, http_headers = cache_manager.fetch_file(request, username, session_id)
config_cdash.LOG.debug('M4S request: local {}, http_headers: {}'.format(local_file_path, http_headers))
self.send_response(HTTP_OK)
for header, header_value in http_headers.items():
self.send_header(header, header_value)
self.end_headers()
with open(local_file_path, 'rb') as request_file:
start_time = timeit.default_timer()
self.wfile.write(request_file.read())
request_time = timeit.default_timer() - start_time
request_size = stat(local_file_path).st_size
else:
config_cdash.LOG.warning('Invalid video file request: {}'.format(request))
else:
self.send_response(HTTP_NOT_FOUND)
config_cdash.LOG.warning('Could not find file {}'.format(request))
return
# If valid request sent
entry_id = datetime.datetime.now()
cursor = TH_CONN.cursor()
throughput = float(request_size)/request_time
config_cdash.LOG.info('Adding row to Throughput database : '
'INSERT INTO THROUGHPUTDATA VALUES ({}, {}, {}, {}, {}, {}, {});'.format(
entry_id, username, session_id, request_id, request_size, request_time, throughput))
cursor.execute('INSERT INTO THROUGHPUTDATA(ENTRYID, USERNAME, SESSIONID, REQUESTSIZE, REQUESTTIME, THROUGHPUT) '
'VALUES (?, ?, ?, ?, ?, ?);', (entry_id, username, session_id, request_size, request_time,
throughput))
TH_CONN.commit()
