two $(2)$ server instances.

Please see the note at the bottom of this page if you were not able to complete the prior programming assignment, and need a client$/$server to complete this assignment.

Details

proxy

Arguments for upstream ports: array$/$tuple$/$set$/$list $($whatever your language supports$).$ These will be the dynamic ports for the server instances.

Accept traffic on a given port.

Send any 'PING' messages in a round$-$robin schedule B between all the given upstream ports.

Any replies it receives from upstream, it will send to the downstream client with $\text{'}$ via $ $($SERVER$\_$PORT$][$$$($SERVER$\_$IDX$])\text{'}$ appended to the message

$$\{$SERVER$\_$PORT$\}$ is the upstream server port.

$$\{$SERVER$\_$IDX$\}$ is the upstream server index in the upstream array.

Example Diagram

In the above example diagram, the proxy is listening on port $8000,$ and is fronting two servers instances listening on port $8001,$ and $8002.$

Example Output with Client, Proxy, and two Server Instances

Client:$1$ : sent PING... received b'PONG via $8001[0],$

$2$ : sent PING... Timed out

$3$ : sent PING... Timed out

$4$ : sent PING... received b'PONG via $8002[1]\text{'}$

$5$ : sent PING... received b'PONG via $8001[0]\text{'}$

$6$ : sent PING... Timed Out

$7$ : sent PING... received b'PONG via $8001[0]\text{'}$

$8$ : sent PING... received b'PONG via $8002[1]\text{'}$

$9$ : sent PING... received b'PONG via $8001[0]$

$10$ : sent PING... received b'PONG via $8002[1]\text{'}$

Proxy:

$\backslash$lambda python

proxy.py $--$port $8000$

$[$proxy$]$ : ready to proxy data...

Server #$0$:

please, solve this as per requirements:

and the output should be like this:

Example Output with Client, Proxy, and two Server Instances

Client:

$\backslash$lambda python client.py $--$port $8000$

$1$ : sent PING... received b'PONG via $8001[0]\text{'}$

$2$ : sent PING... Timed Out

$3$ : sent PING... Timed Out

$4$ : sent PING... received b'PONG via $8002[1]\text{'}$

$5$ : sent PING... received b'PONG via $8001[0]\text{'}$

$6$ : sent PING... Timed Out

$7$ : sent PING... received b'PONG via $8001[0]\text{'}$

$8$ : sent PING... received b'PONG via $8002[1]\text{'}$

$9$ : sent PING... received b'PONG via $8001[0]\text{'}$

$10$ : sent PING... received b'PONG via $8002[1]\text{'}$

Proxy:

$\backslash$lambda python proxy.py $--$port $8000$

$[$proxy$]$ : ready to proxy data...

Server #$0$:

$\backslash$lambda python server.py $--$port $8001$

$[$server$]$ : ready to accept data...

$[$client$]$ : PING

$[$server$]$ : packet dropped

$[$client$]$ : PING

$[$client$]$ : PING

$[$client$]$ : PING

Server #$1$:

$\backslash$lambda python server.py $--$port $8002$

$[$server$]$ : ready to accept data...

$[$server$]$ : packet dropped

$[$client$]$ : PING

$[$server$]$ : packet dropped

$[$client$]$ : PING

$[$server$]$ : PING