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Assignment:

  • I have completed the optional part (suffix) as well as all the original requirements
    • Include prefix and suffix from backendA, backendB, backendC
  • Completed makefile that uses commands
    • make serverA
    • make serverB
    • make serverC
    • make aws
    • make monitor

Code Files:

  • aws.cpp
    • Main server that establishes TCP connections with client and monitor for communication. Also establishes UDP connections with serverA, serverB, and serverC for further back-end communication.
  • client.cpp
    • Client front-end that allows a user to input commands (search, prefix, suffix) to receive a result from aws. Displays simple results received from aws through TCP connection.
  • monitor.cpp
    • Displays extended results from client's request. Receives results from aws through TCP connection.
  • serverA.cpp/serverB.cpp/serverC.cpp
    • Back-end servers that represent backendA.txt, backendB.txt, and backendC.txt. Receives request from aws through UDP connection and sends back results to be processed by aws.

Message Format:

Idiosyncrasy

  • Program Fails if:
    • The program works as intended to by the instructions
  • Program Exits If:
    • user input for client is incorrect in format
    • user input for function is not supported
    • user input for input is more than 27 characters
    • getaddrinfo() fails
    • invalid connection to socket
    • recv() has an error
    • send() has an error
    • recvfrom() has an error
    • sendto() has an error
    • listen() fails

Sources:

"Beej's Guide to C Programming and Network Programming (socket programming)"

  • Section 6: Client-Server Background
    • 6.1. A Simple Stream Server (Used for reference in aws)
    • 6.2. A Simple Stream Client (Used for reference in client, aws)
    • 6.3. Datagram Sockets (Used for reference in aws, serverA, serverB, serverC)
  • Section 9: Man Pages (Used for reference in method and function calling)

Overall, I drew the procedure of receiving and sending messages by TCP or UDP from this guide. I read over it in depth and used the information to form a working network of servers and clients. Functions include a wide array over all files such as:

  • getaddrinfo(), socket(), bind(), connect(), listen(), accept(), send(), recv(), sendto(), recvfrom(), close()

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