The emergence of fake news and the need for trusted sources of information requires an information system where relevant public information and facts can be posted, tracked and verified.
Catarina Guerreiro Gomes Pedreira 87524
Carolina Maria Da Cunha Carreira 87641
Miguel Veloso Barros 87691
Requirements:
Java 11
Apache Maven
Steps to Run:
From the project root directory:
$ mvn clean install
This installs all the dependencies and runs the tests
From the scripts directory:
$./start.sh f where f is the number of faults to tolerate
This starts the 3f+1 servers, starting on port 9000. It also generates client and server keystores and places them in the appropriate directories
You can also run $./start-fault.sh f, which starts 2f+1 servers, thus displaying the systems fault tolerance
Start a client with ./client.sh f. Stop the client with Ctrl+c
Since servers are started in the background, to stop the system we recommend using killall java.
The library module has the client-front end, which is used by the client application in the client module.
You can use the client application to test the functioning of the system. It's only limitation is that posts, references and files may not include spaces.
Alternatively, you can have a look at our test suite, which can be found in two modules:
The common module tests that the domain of the application is correct and that the correct exceptions are always thrown.
The utils module tests implements the algorithms for authenticated perfect links and byzantine tolerant shared memory and testes them
The server module test that the server performs all the operations correctly, that the system can handle concurrent requests and maintain a consistent state, and the properties fault tolerance properties of the system.
You can find the report in the docs folder