Basic database (#19)

# Fixes

This adds a lot of basic database interactions and provides examples with the members type

## Related Issues

- #4 
- #5 
- #6

.travis.yml

@@ -6,4 +6,5 @@ before_script:
 script:
 - cargo fmt --all -- --check
 - cargo build
-- cargo test
+- cargo test -- --test-threads=1
+

docs/database-schema.xml

@@ -1 +1 @@
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docs/extra-docker-info.md

@@ -41,8 +41,9 @@ docker-compose exec backend bash
 ```
 
 From there all normal Diesel or Rust maintenance commands can be run. Please go to the official documentation for details, a list of commonly used commands are below.
-- `cargo upgrade`
 - `cargo fmt`
+- `cargo test -- --test-threads=1`
+- `cargo upgrade`
 - `cargo clippy`
 - `diesel setup`
 - `diesel migration generate {name}`

migrations/2018-12-19-163802_create_students_and_events/down.sql

@@ -0,0 +1,4 @@
+-- Remove the member, event, and attendance table
+DROP TABLE attendance; -- Remove this first, because it depends on the other tables
+DROP TABLE member;
+DROP TABLE event;

migrations/2018-12-19-163802_create_students_and_events/up.sql

@@ -0,0 +1,30 @@
+-- Create a member table
+CREATE TABLE member (
+	ufl_username TEXT PRIMARY KEY,
+	is_info_filled_out BOOLEAN NOT NULL DEFAULT FALSE,
+	first_name TEXT NOT NULL DEFAULT '',
+	last_name TEXT NOT NULL DEFAULT '',
+	discord_username TEXT NOT NULL DEFAULT '',
+	github_username TEXT NOT NULL DEFAULT '',
+	server_username TEXT NOT NULL DEFAULT '',
+	server_key TEXT NOT NULL DEFAULT '',
+	is_acm_shareable BOOLEAN NOT NULL DEFAULT FALSE,
+	is_in_email_list BOOLEAN NOT NULL DEFAULT FALSE
+);
+
+-- Create an event table
+CREATE TABLE event (
+	start_timestamp TIMESTAMPTZ PRIMARY KEY, -- Events can not start at the same time and day
+	title TEXT NOT NULL, -- Must have title
+	location TEXT NOT NULL, -- Must have location
+	description TEXT NOT NULL DEFAULT '',
+	end_timestamp TIMESTAMPTZ NOT NULL, -- Events must have an end time
+	image BYTEA NOT NULL DEFAULT '\000'-- Image binary defaults to 0
+);
+
+-- Create a many to many attendance table
+CREATE TABLE attendance (
+	ufl_username TEXT REFERENCES member,
+	start_timestamp TIMESTAMPTZ REFERENCES event,
+	PRIMARY KEY (ufl_username, start_timestamp)
+);

src/attendance.rs

@@ -0,0 +1,11 @@
+use diesel::prelude::*;
+use diesel::sql_types::Timestamptz;
+
+use super::database;
+use super::schema::attendance;
+
+#[derive(Queryable)]
+pub struct Attendance {
+	pub ufl_username: String,
+	pub start_timestamp: Timestamptz,
+}

src/database.rs

@@ -0,0 +1,15 @@
+extern crate diesel;
+
+use diesel::pg::PgConnection;
+use diesel::prelude::*;
+use std::env;
+
+// club_data data is defined in Rocket.toml
+#[database("club_data")]
+pub struct ClubDbConn(diesel::PgConnection);
+
+// Create connection for other functions to use
+pub fn establish_connection() -> PgConnection {
+	let database_url = env::var("DATABASE_URL").expect("DATABASE_URL must be set");
+	PgConnection::establish(&database_url).expect(&format!("Error connecting to {}", database_url))
+}

src/event.rs

@@ -0,0 +1,16 @@
+use diesel::prelude::*;
+use diesel::sql_types::Bytea;
+use diesel::sql_types::Timestamptz;
+
+use super::database;
+use super::schema::event;
+
+#[derive(Queryable)]
+pub struct Event {
+	pub start_timestamp: Timestamptz,
+	pub title: String,
+	pub location: String,
+	pub description: String,
+	pub end_timestamp: Timestamptz,
+	pub image: Bytea,
+}

src/main.rs

@@ -1,31 +1,34 @@
 #![feature(proc_macro_hygiene, decl_macro)]
+// Temporarily silence warnings caused by Diesel (https://github.com/diesel-rs/diesel/issues/1785)
+#![allow(proc_macro_derive_resolution_fallback)]
 
 #[macro_use]
 extern crate rocket;
 #[macro_use]
 extern crate rocket_contrib;
+#[macro_use]
+extern crate diesel;
 
-use diesel::pg::PgConnection;
-use diesel::prelude::*;
-use rocket_contrib::databases::diesel;
-use std::env;
-
-#[database("club_data")]
-struct ClubDbConn(diesel::PgConnection);
+// Utility local dependencies
+mod database;
+mod schema;
 
-pub fn establish_connection() -> PgConnection {
-	let database_url = env::var("DATABASE_URL").expect("DATABASE_URL must be set");
-	PgConnection::establish(&database_url).expect(&format!("Error connecting to {}", database_url))
-}
+// Table specifc local dependencies
+mod attendance;
+mod event;
+mod member;
 
+// Check to see if the server is working
 #[get("/")]
 fn index() -> &'static str {
 	"Hello, world!"
 }
 
+// Launch the REST server with the database connection
 fn main() {
 	rocket::ignite()
-		.attach(ClubDbConn::fairing())
+		.attach(database::ClubDbConn::fairing())
+		// Note: Be sure to mount all the routes from differnt modules
 		.mount("/", routes![index])
 		.launch();
 }

src/member.rs

@@ -0,0 +1,137 @@
+use diesel::prelude::*;
+
+use super::database;
+use super::schema::member;
+
+/* Struct Setup */
+
+// Struct for interacting with the member table
+#[derive(Insertable, Queryable)]
+#[table_name = "member"]
+pub struct Member {
+	pub ufl_username: String,
+	pub is_info_filled_out: bool,
+	pub first_name: String,
+	pub last_name: String,
+	pub discord_username: String,
+	pub github_username: String,
+	pub server_username: String,
+	pub server_key: String,
+	pub is_acm_shareable: bool,
+	pub is_in_email_list: bool,
+}
+
+// Support creating new members that supply just a UFL username
+impl Member {
+	fn new(ufl_username: &str) -> Self {
+		Member {
+			ufl_username: ufl_username.to_string(),
+			..Default::default()
+		}
+	}
+}
+
+// Set default values for Member
+// Note: the UFL username should never be not set (Rust requires all values to have a default)
+impl Default for Member {
+	fn default() -> Member {
+		Member {
+			ufl_username: "".to_string(),
+			is_info_filled_out: false,
+			first_name: "".to_string(),
+			last_name: "".to_string(),
+			github_username: "".to_string(),
+			discord_username: "".to_string(),
+			server_username: "".to_string(),
+			server_key: "".to_string(),
+			is_acm_shareable: false,
+			is_in_email_list: false,
+		}
+	}
+}
+
+/* CRUD and other functions */
+
+// Return all members
+pub fn list_members() -> Vec<Member> {
+	let connection = database::establish_connection();
+	let results = member::table
+		.load::<Member>(&connection)
+		.expect("Error loading members");
+	results
+}
+
+// Add a member with a UFL username
+pub fn add_member(ufl_username: &str) {
+	let connection = database::establish_connection();
+
+	let new_member = Member::new(&ufl_username);
+
+	diesel::insert_into(member::table)
+		.values(&new_member)
+		.get_result::<Member>(&connection)
+		.expect("Error saving new member");
+}
+
+// Remove a member by their username
+pub fn remove_member(ufl_username: &str) {
+	let connection = database::establish_connection();
+
+	let num_deleted =
+		diesel::delete(member::table.filter(member::columns::ufl_username.eq(ufl_username))) //.like(ufl_username)))
+			.execute(&connection)
+			.expect("Error deleting members");
+
+	println!("Deleted {} members", num_deleted);
+}
+
+/* Unit testing */
+
+// Note: Do run the test as `cargo test -- --test-threads=1` to run the database calls in order
+#[cfg(test)]
+mod tests {
+	use super::*;
+
+	// Utility function to clear out the whole member table
+	fn clear_table() {
+		let connection = database::establish_connection();
+
+		diesel::delete(member::table)
+			.execute(&connection)
+			.expect("Error deleting all members");
+	}
+
+	// Check to make sure no members exist by default
+	#[test]
+	fn no_members() {
+		clear_table();
+		assert_eq!(Vec::len(&list_members()), 0);
+	}
+
+	// Check that one member exists after they are created
+	#[test]
+	fn one_member() {
+		clear_table();
+		add_member("[email protected]");
+		assert_eq!(Vec::len(&list_members()), 1);
+	}
+
+	// Check that two members exist agter they are both created
+	#[test]
+	fn two_member() {
+		clear_table();
+		add_member("[email protected]");
+		add_member("[email protected]");
+		assert_eq!(Vec::len(&list_members()), 2);
+	}
+
+	// Checl that a single member can be deleted after being created
+	#[test]
+	fn delete_member() {
+		clear_table();
+		add_member("[email protected]");
+		remove_member("[email protected]");
+		assert_eq!(Vec::len(&list_members()), 0);
+	}
+
+}

src/schema.rs

@@ -0,0 +1,37 @@
+table! {
+	attendance (ufl_username, start_timestamp) {
+		ufl_username -> Text,
+		start_timestamp -> Timestamptz,
+	}
+}
+
+table! {
+	event (start_timestamp) {
+		start_timestamp -> Timestamptz,
+		title -> Text,
+		location -> Text,
+		description -> Text,
+		end_timestamp -> Timestamptz,
+		image -> Bytea,
+	}
+}
+
+table! {
+	member (ufl_username) {
+		ufl_username -> Text,
+		is_info_filled_out -> Bool,
+		first_name -> Text,
+		last_name -> Text,
+		discord_username -> Text,
+		github_username -> Text,
+		server_username -> Text,
+		server_key -> Text,
+		is_acm_shareable -> Bool,
+		is_in_email_list -> Bool,
+	}
+}
+
+joinable!(attendance -> event (start_timestamp));
+joinable!(attendance -> member (ufl_username));
+
+allow_tables_to_appear_in_same_query!(attendance, event, member,);