https://github.com/petru-braha/rr-application

This local client-server application serves an example of a digital communication useful in the transport industry
https://github.com/petru-braha/rr-application

command-design-pattern concurency multiplexing protocols socket-communication thread-synchronization

Last synced: about 2 months ago
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This local client-server application serves an example of a digital communication useful in the transport industry

• Host: GitHub
• URL: https://github.com/petru-braha/rr-application
• Owner: petru-braha
• Created: 2024-11-25T07:42:15.000Z (3 months ago)
• Default Branch: master
• Last Pushed: 2024-12-16T21:47:07.000Z (2 months ago)
• Last Synced: 2024-12-16T22:45:40.988Z (2 months ago)
• Topics: command-design-pattern, concurency, multiplexing, protocols, socket-communication, thread-synchronization
• Language: C
• Homepage: https://edu.info.uaic.ro/computer-networks/
• Size: 1.93 MB
• Stars: 0
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
# Romanian railways application

You can find the romanian version of this document [here](./docs/README_RO.md).

## Main files

- [client application](./client.c)

- [server application](./server.c)

- [official documentation](./docs/rr_raport.pdf)

## The communication protocol

0. [id_train, time_departure_estimated, time_arrival_estimated, status] routes(location_departure, location_arrival)

1. [id_train, time_departure_confirmed, location_arrival] departures(location_departure)

2. [id_train, time_arrival_confirmed, location_departure] arrivals(location_arrival)

3. void report(id_train, minutes)

4. void quit()

- function synopsis: return_type name_function parameter(s)

- estimated times = initial times defined by the generated schedule

- confirmed times = estimated times +/- delays (depends if the train arrives earlier or later)

## Description

- locations types

    - departures

    - arrivals

- times types

    - confirmed departure time

    - estimated departure time

    - confirmed arrival time

    - estimated arrival time

- the time of the application is the current Romania time.

- an itinerary is from point A to point B and no other points exists between these two.

- client's main() function takes ip address and the port as arguments. it approach simulates real connections between different sides. hard coding the connection of a client for a specific server is more suggestive, but less clever.

## Implementation

0. correctness

- client uses tcp to server when sending data

- client uses udp to server when sending queries

- server uses tcp to client when sending data




1. speed

	

- prethreaded execution

- create thread for each client

- i/o multiplexing with non-blocking calls




2. security

- specific procedures for possible errors

- solution if one party stops responding

- second end of the server

## To do

- the server shouldn't shut down during loop if errors occur

- [ideas](./docs/brainstorm.md)

- change time after an ip address becomes available again after closing server




- raport: TDD, security if party crashes

- raport: timed experiment - see conc_serv

- raport: limitations (introduction), scenarios in conclusions

- increase safety with two running servers: one on my computer, one on the faculty's server, every update on the main server will tcp its way to the second one




- overcome the only 1024 clients at once limitation

- windows portability

- endianess portability