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Copy pathhttp-threaded-simulated-disk-io-server.py
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96 lines (77 loc) · 3 KB
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# python threads - simulate occasional problematic (long blocking) requests
# to run: python http-threaded-simulated-disk-io-server.py
import string
import time
import socket
from threading import Thread
READ_TIMEOUT_SECS = 4
SERVER_NAME = 'http-threaded-simulated-disk-io-server.py'
HTTP_STATUS_OK = '200 OK'
HTTP_STATUS_TIMEOUT = '408 TIMEOUT'
HTTP_STATUS_BAD_REQUEST = '400 BAD REQUEST'
def simulated_file_read(elapsed_time_ms):
time.sleep(elapsed_time_ms / 1000.0) # seconds
def handle_socket_request(sock, receipt_timestamp):
reader = sock.makefile('r')
writer = sock.makefile('w')
request_text = reader.readline()
reader.close()
if request_text:
request_text = request_text.rstrip()
start_processing_timestamp = time.time()
queue_time_ms = start_processing_timestamp - receipt_timestamp
queue_time_secs = queue_time_ms / 1000
rc = HTTP_STATUS_OK
disk_read_time_ms = 0
file_path = ''
# has this request already timed out?
if queue_time_secs >= READ_TIMEOUT_SECS:
print("timeout (queue)")
rc = HTTP_STATUS_TIMEOUT
else:
line_tokens = string.split(request_text, ' ')
if len(line_tokens) > 1:
request_method = line_tokens[0]
args_text = line_tokens[1]
fields = string.split(args_text, ',')
if len(fields) == 3:
first_field = fields[0].strip('/')
rc = int(first_field)
disk_read_time_ms = long(fields[1])
file_path = fields[2]
simulated_file_read(disk_read_time_ms)
else:
print("len(fields) != 3")
rc = HTTP_STATUS_BAD_REQUEST
else:
print("len(line_tokens) <= 0")
rc = HTTP_STATUS_BAD_REQUEST
# total request time is sum of time spent in queue and the
# simulated disk read time
tot_request_time_ms = queue_time_ms + disk_read_time_ms
# construct response and send back to client
resp_text = 'HTTP/1.1 %s\n' % rc
resp_text += "%s\n" % SERVER_NAME
resp_text += "Connection: close\n\n"
resp_text += "%d,%s" % \
(tot_request_time_ms, file_path)
writer.write(resp_text)
writer.flush()
writer.close()
sock.close()
def main(server_port):
server_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
server_socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
server_socket.bind(('', server_port))
server_socket.listen(100)
print("server listening on port %d" % server_port)
try:
while True:
sock, addr = server_socket.accept()
receipt_timestamp = time.time()
Thread(target=lambda: handle_socket_request(sock, receipt_timestamp)).start()
except KeyboardInterrupt:
pass # exit
if __name__=='__main__':
server_port = 7000
main(server_port)