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[Example] Overriding the Default Submitty Router (#22)
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‎examples/16_docker_network_python/config/config.json‎

Lines changed: 48 additions & 30 deletions
Original file line numberDiff line numberDiff line change
@@ -3,17 +3,15 @@
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// your assignment should fail to build.
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"autograding_method" : "docker",
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"container_options" : {
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//States that a given testcase uses a router by default. (Default value is true)
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"use_router" : true
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//States that a given testcase uses a router by default. (Default value is true)
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"use_router" : true
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},
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"autograding" : {
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"work_to_details" : [ "**/*.csv", "**/*.txt" ]
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"work_to_details" : [ "**/*.txt" ]
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},
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// Each testcase creates a new, unique set of docker containers and networks.
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"testcases" : [
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// *************** TEST CASES *****************
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{
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//Despite the default being true, this testcase will not use a router.
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"use_router" : false,
@@ -28,7 +26,7 @@
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//outgoing_connections list the containers that this container is allowed to network to.
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"outgoing_connections" : ["client"]
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// You can specify a docker image here, and if it is built on submitty, this container
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// will use it. At the moment, this field defaults to ubuntu:custom if unset -- the default
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// will use it. If unset, this field defaults to ubuntu:custom -- the default
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// submitty image.
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//container_image : <image_name>
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},
@@ -38,19 +36,12 @@
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// In this example, we want the server to start before the client, so we add a sleep command.
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"commands" : ["sleep 2", "python3 client.py client 0"],
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"outgoing_connections" : ["server"]
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},
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{
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// At the moment, a router should always be specified, which relays student messages.
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// The router should have the unique name "router."
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"container_name" : "router",
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"commands" : ["python3 router.py"]
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}
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],
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"points" : 5,
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"validation": [
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{
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"method" : "diff",
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//output files are stored in a directory that matches the container_name specified above.
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"actual_file" : "server/STDOUT.txt",
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"expected_file" : "expected_server_output_0.txt",
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"failure_message" : "ERROR: Your code did not match the expected output.",
@@ -70,19 +61,16 @@
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{
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"title" : "Ping Pong, Ping Pong",
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"containers" : [
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//This testcase is using a router, which will be injected into the network.
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{
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"container_name" : "server",
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"commands" : ["python3 server.py server"], //string or array of strings.
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"commands" : ["python3 server.py server"],
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"outgoing_connections" : ["client"]
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},
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{
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"container_name" : "client",
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"commands" : ["sleep 2", "python3 client.py client 1"],
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"outgoing_connections" : ["server"]
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},
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{
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"container_name" : "router",
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"commands" : ["python3 router.py"]
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}
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],
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"points" : 5,
@@ -102,6 +90,15 @@
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"failure_message" : "ERROR: Your code did not match the expected output.",
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"show_message" : "on_failure",
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"deduction" : 0.5
93+
},
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//Adding this "sequence_diagram" filecheck will display a sequence diagram
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// of messages passed to the student.
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{
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"sequence_diagram" : true,
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"type" : "FileCheck",
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"title" : "Sequence Diagram Text File",
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"actual_file" : "router/sequence_diagram.txt",
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"points" : 0
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}
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]
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},
@@ -110,17 +107,13 @@
110107
"containers" : [
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{
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"container_name" : "server",
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"commands" : ["python3 server.py server"], //string or array of strings.
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"commands" : ["python3 server.py server"],
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"outgoing_connections" : ["client"]
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},
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{
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"container_name" : "client",
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"commands" : ["sleep 2", "python3 client.py client 2"],
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"outgoing_connections" : ["server"]
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},
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{
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"container_name" : "router",
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"commands" : ["python3 router.py"]
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}
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],
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"points" : 5,
@@ -140,6 +133,15 @@
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"failure_message" : "ERROR: Your code did not match the expected output.",
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"show_message" : "on_failure",
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"deduction" : 0.5
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},
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//Adding this "sequence_diagram" filecheck will display a sequence diagram
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// of messages passed to the student.
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{
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"sequence_diagram" : true,
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"type" : "FileCheck",
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"title" : "Sequence Diagram Text File",
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"actual_file" : "router/sequence_diagram.txt",
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"points" : 0
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}
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]
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},
@@ -148,17 +150,13 @@
148150
"containers" : [
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{
150152
"container_name" : "server",
151-
"commands" : ["python3 server.py server"], //string or array of strings.
153+
"commands" : ["python3 server.py server"],
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"outgoing_connections" : ["client"]
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},
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{
155157
"container_name" : "client",
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"commands" : ["sleep 2", "python3 client.py client 3"],
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"outgoing_connections" : ["server"]
158-
},
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{
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"container_name" : "router",
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"commands" : ["python3 router.py"]
162160
}
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],
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"points" : 5,
@@ -178,6 +176,15 @@
178176
"failure_message" : "ERROR: Your code did not match the expected output.",
179177
"show_message" : "on_failure",
180178
"deduction" : 0.5
179+
},
180+
//Adding this "sequence_diagram" filecheck will display a sequence diagram
181+
// of messages passed to the student.
182+
{
183+
"sequence_diagram" : true,
184+
"type" : "FileCheck",
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"title" : "Sequence Diagram Text File",
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"actual_file" : "router/sequence_diagram.txt",
187+
"points" : 0
181188
}
182189
]
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},
@@ -187,17 +194,19 @@
187194
"containers" : [
188195
{
189196
"container_name" : "server",
190-
"commands" : ["python3 server.py server udp_enabled"], //string or array of strings.
197+
"commands" : ["python3 server.py server udp_enabled"],
191198
"outgoing_connections" : ["client"]
192199
},
193200
{
194201
"container_name" : "client",
195202
"commands" : ["sleep 2", "python3 client.py client 4 udp_enabled"],
196203
"outgoing_connections" : ["server"]
197204
},
205+
//This testcase uses a custom router. This container must be named router
206+
// and will automatically be connected up correctly.
198207
{
199208
"container_name" : "router",
200-
"commands" : ["python3 router.py"]
209+
"commands" : ["python3 custom_router.py"]
201210
}
202211
],
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"points" : 5,
@@ -209,6 +218,15 @@
209218
"failure_message" : "ERROR: Your code did not match the expected output.",
210219
"show_message" : "on_failure",
211220
"deduction" : 1.0
221+
},
222+
//Adding this "sequence_diagram" filecheck will display a sequence diagram
223+
// of messages passed to the student.
224+
{
225+
"sequence_diagram" : true,
226+
"type" : "FileCheck",
227+
"title" : "Sequence Diagram Text File",
228+
"actual_file" : "router/sequence_diagram.txt",
229+
"points" : 0
212230
}
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]
214232
}

‎examples/16_docker_network_python/config/test_input/custom_router.py‎

Lines changed: 77 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,77 @@
1+
import socket
2+
import sys
3+
import csv
4+
import traceback
5+
import queue
6+
import errno
7+
from time import sleep
8+
import os
9+
import datetime
10+
import random
11+
from datetime import timedelta
12+
13+
from submitty_router import submitty_router
14+
15+
#Custom router extends submitty_router
16+
class custom_router(submitty_router):
17+
# The constructor for our custom router
18+
def __init__(self, seed=None, log_file='router_log.txt'):
19+
super().__init__(seed=seed, log_file=log_file)
20+
21+
'''
22+
Override this function to manipuate student messages.
23+
'''
24+
def manipulate_recieved_message(self, sender, recipient, port, message, message_number):
25+
now = datetime.datetime.now()
26+
# The total time the program has been running as of right now.
27+
elapsed_time = now - self.execution_start_time
28+
# Use the time at which this message will be processed. Set to now initially.
29+
process_time = now
30+
# Leave blank to avoid outputting a message to the student on their sequence diagram
31+
message_to_student = None
32+
#If true, this message is entirely discarded.
33+
drop_me = False
34+
35+
#EXAMPLE: modify one bit of the student's message in 1/10 messages before 2 seconds
36+
if random.randint(1,10) == 10 and elapsed_time.total_seconds() <= 2:
37+
# Convert the message int an array of bytes
38+
m_array = bytearray(message)
39+
# Determine which bit will be flipped
40+
flipbit = random.randint(0,len(m_array)-1 )
41+
# Flip the bit
42+
m_array[flipbit] = m_array[flipbit] + 1
43+
# Update the message
44+
message = bytes(m_array)
45+
# OPTIONAL: Tell the student that their message was corrupted via a message in their sequence diagram.
46+
message_to_student = "Corrupted"
47+
#EXAMPLE: delay the student message by up to 1 second in 1/10 messages
48+
elif random.randint(1,10) == 10:
49+
# Choose an amount of delay (in ms) between .1 and 1 second.
50+
milliseconds_dela = random.randint(100,1000)
51+
# Extend the processing time that far into the future
52+
process_time = process_time + timedelta(milliseconds=milliseconds_dela)
53+
# OPTIONAL: add a message to the student's sequence diagram that lets them know about the delay
54+
message_to_student = "Delayed {0} ms".format(milliseconds_dela)
55+
#We drop 1/10th of packets
56+
elif random.randint(1,10) == 10:
57+
drop_me = True
58+
59+
data = {
60+
'sender' : sender,
61+
'recipient' : recipient,
62+
'port' : port,
63+
'message' : message,
64+
'message_to_student' : message_to_student,
65+
'drop_message' : drop_me
66+
}
67+
return (process_time, data)
68+
69+
70+
#You must provide a main which is capable of running your router.
71+
if __name__ == '__main__':
72+
router = custom_router()
73+
router.log("This is the custom router!")
74+
# submitty_router provides init and run functions for you to call.
75+
router.init()
76+
router.run()
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