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use std::path::Path;
use r2d2::Pool;
use r2d2_sqlite::SqliteConnectionManager;
use r2d2_sqlite::rusqlite::OptionalExtension;
use super::problem::Problem;
use super::user::User;
#[derive(Clone)]
pub struct Database {
pool: Pool<SqliteConnectionManager>
}
#[derive(Debug)]
pub enum DatabaseError {
Connection(String),
Query(String),
}
impl Database {
pub fn new(database_path: impl AsRef<Path>) -> Result<Self, DatabaseError> {
let manager = SqliteConnectionManager::file(database_path);
let pool = Pool::new(manager)
.map_err(|e| DatabaseError::Connection(e.to_string()))?;
Ok(Database { pool })
}
pub fn new_in_memory() -> Result<Self, DatabaseError> {
let manager = SqliteConnectionManager::memory();
let pool = Pool::new(manager)
.map_err(|e| DatabaseError::Connection(e.to_string()))?;
Ok(Database { pool })
}
pub fn insert_user(&self, email: &str, username: &str, password_hash: &str) -> Result<User, DatabaseError> {
static QUERY: &str = include_str!("sql/insert_user.sql");
let conn = self.pool
.get()
.map_err(|e| DatabaseError::Connection(e.to_string()))?;
let mut statement = conn.prepare(QUERY)
.map_err(|e| DatabaseError::Query(e.to_string()))?;
Ok(statement
.query_one((email, username, password_hash), |row| {
Ok(User::new(
row.get("id")?,
email.to_owned(),
username.to_owned(),
password_hash.to_owned(),
))
})
.map_err(|e| DatabaseError::Query(e.to_string()))?
)
}
pub fn fetch_user_by_email(&self, email: &str) -> Result<Option<User>, DatabaseError> {
static QUERY: &str = include_str!("sql/fetch_user_by_email.sql");
let conn = self.pool
.get()
.map_err(|e| DatabaseError::Connection(e.to_string()))?;
let mut statement = conn.prepare(QUERY)
.map_err(|e| DatabaseError::Query(e.to_string()))?;
Ok(statement
.query_one([email], |row| {
Ok(User::new(
row.get("id")?,
row.get("email")?,
row.get("username")?,
row.get("password_hash")?,
))
})
.optional()
.map_err(|e| DatabaseError::Query(e.to_string()))?
)
}
pub fn fetch_user_by_username(&self, username: &str) -> Result<Option<User>, DatabaseError> {
static QUERY: &str = include_str!("sql/fetch_user_by_username.sql");
let conn = self.pool
.get()
.map_err(|e| DatabaseError::Connection(e.to_string()))?;
let mut statement = conn.prepare(QUERY)
.map_err(|e| DatabaseError::Query(e.to_string()))?;
Ok(statement
.query_one([username], |row| {
Ok(User::new(
row.get("id")?,
row.get("email")?,
row.get("username")?,
row.get("password_hash")?,
))
})
.optional()
.map_err(|e| DatabaseError::Query(e.to_string()))?
)
}
pub fn insert_problem(&self, title: &str, description: &str) -> Result<Problem, DatabaseError> {
static QUERY: &str = include_str!("sql/insert_problem.sql");
let conn = self.pool
.get()
.map_err(|e| DatabaseError::Connection(e.to_string()))?;
let mut statement = conn.prepare(QUERY)
.map_err(|e| DatabaseError::Query(e.to_string()))?;
Ok(statement
.query_one((title, description), |row| {
Ok(Problem::new(
row.get("id")?,
title.to_owned(),
description.to_owned(),
))
})
.map_err(|e| DatabaseError::Query(e.to_string()))?
)
}
pub fn fetch_problems(&self) -> Result<Vec<Problem>, DatabaseError> {
static QUERY: &str = include_str!("sql/fetch_problems.sql");
let conn = self.pool
.get()
.map_err(|e| DatabaseError::Connection(e.to_string()))?;
let mut statement = conn.prepare(QUERY)
.map_err(|e| DatabaseError::Query(e.to_string()))?;
Ok(statement
.query_map([], |row| {
Ok(Problem::new(
row.get("id")?,
row.get("title")?,
row.get("description")?,
))
})
.map_err(|e| DatabaseError::Query(e.to_string()))?
.collect::<Result<Vec<Problem>, _>>()
.map_err(|e| DatabaseError::Query(e.to_string()))?
)
}
pub fn initialize(&self) -> Result<(), DatabaseError> {
static QUERY: &str = include_str!("sql/initialize.sql");
let conn = self.pool
.get()
.map_err(|e| DatabaseError::Connection(e.to_string()))?;
conn.execute_batch(QUERY)
.map_err(|e| DatabaseError::Query(e.to_string()))?;
Ok(())
}
}
#[cfg(test)]
mod tests {
use super::*;
#[tokio::test]
async fn test_problem_database() {
let db = Database::new_in_memory().unwrap();
db.initialize().unwrap();
let title = "test problem 1";
let description = "description of test problem 1";
let problem = db.insert_problem(title, description).unwrap();
assert_eq!(problem.title(), title);
assert_eq!(problem.description(), description);
let problems = db.fetch_problems().unwrap();
assert_eq!(problems.len(), 1);
assert_eq!(problems[0].title(), title);
assert_eq!(problems[0].description(), description);
assert_eq!(problems[0].id(), problem.id());
}
}
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