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ECE 421 | Exploring Software Development Domains
1
Assignment 6: Databases
Question 1: Consider the bank application from Lab 5
(https://eclass.srv.ualberta.ca/mod/assign/view.php?id=4077941):
a- Create a function to return the transaction history for a given user. The function should have the
following signature:
fn get_transactions_history(&self, u_name:&str)-Result<(),UBaseErr
Using this function, you should be able to view the transaction history for a given user. A sample
output should look like:
Matt received $140 from Jim on 12/10/2019 11:34 p.m.
Matt sent $100 from Andrew on 24/11/2019 01:12 p.m.
b- Edit the pay function, so it checks for the balance of a given user before allowing them to pay
money to another user. The function should not allow the user to send money unless they have
enough money in their bank account! That is, they must still have a positive balance after the
transfer. (Hint: you may utilize the function get_balance in this task).
c- Provide the necessary test functions to test your code in a and b.
Please upload your submission as a complete Rust project with the name “Assignment6Question1”.
The project must contain the database file in the data folder.
Question 2: Complete your bank project by creating a command-line app for accessing the database. The
app should allow the user to send commands as arguments. Then, the app must be able to interpret these
arguments and interact with the user properly.
Here are a set of arguments that the app must be able to work with:
1- new: This is a command to create a new user, the second, and the third arguments, in this case,
should provide the username and password. If the user forgot to provide the necessary arguments,
the app must prompt him/her to complete the command with whatever needed.
2- transfer: This is a command to send money from one user (from_user) to another user (to_user).
Please note that this function requires providing the password of the from_user. Therefore, the app
must ask the user to enter his password to complete the payment operation.
3- balance: This is a command to show the balance of a given user. Again, this is a command that
requires the user to enter his password first to be able to check his balance.
Here is a sample of what should the program look like. Please, note that the user input is highlighted in
boldface.
# cargo run — new matt mattpw
Adding user matt with password mattpw…
Operation done successfully!
# cargo run transfer — steve matt 150
Please input your password:
stevepw
Sending money from steve to matt…
Operation done successfully!
Cargo run — balance matt
ECE 421 | Exploring Software Development Domains
2
Please input your password:
mattpw
Balance is $100
Operation done successfully!
Please upload your submission as a complete Rust project with the name “Assignment6Question2”. The
project must contain the database file in the data folder.
Question 3: You have been using bcrypt to encrypt and validate the user password. However, bycrypt is
getting old. Malicious users can now successfully attack bcypt using massive concurrent attacks. Hence,
best practice is to use argon2 instead (https://docs.rs/rust-argon2/0.5.1/argon2/). Rewrite the code to follow
best practices.
Please upload your submission as a complete Rust project with the name “Assignment6Question3”. The
project must contain the database file in the data folder.

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