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EN605.607.81.SP22_ASDM_Project
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backend: Some refactoring 

Reuse "check if player exists" fn where needed. Also, the same fn was
refactored to handle using an existing DB Connection.
This commit is contained in:
Stephen Seo 2022-03-29 17:10:12 +09:00
parent fe56adf562
commit c5b9156df3
1 changed files with 28 additions and 21 deletions
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49
back_end/src/db_handler.rs
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@ -53,19 +53,19 @@ impl DBHandler {
}
let conn = conn_result.unwrap();
loop {
let stmt_result = conn.prepare("SELECT id FROM players WHERE id = ?;");
if let Err(e) = stmt_result {
println!("Failed to create sqlite statement: {:?}", e);
let exists_result = self.check_if_player_exists(Some(&conn), player_id);
if let Ok(exists) = exists_result {
if exists {
player_id = thread_rng().gen();
} else {
break;
}
} else {
let error = exists_result.unwrap_err();
println!("Failed to check if player exists in db: {:?}", error);
self.shutdown_tx.send(()).ok();
return true;
}
let mut stmt = stmt_result.unwrap();
match stmt.query_row([player_id], |_row| Ok(())) {
Ok(_) => {
player_id = thread_rng().gen();
}
Err(_) => break,
}
}
let insert_result = conn.execute(
"INSERT INTO players (id, date_added) VALUES (?, datetime());",
@ -243,7 +243,7 @@ impl DBHandler {
fn check_if_player_is_paired(&self, player_id: u32) -> Result<CheckPairingType, String> {
{
let player_exists_result = self.check_if_player_exists(player_id);
let player_exists_result = self.check_if_player_exists(None, player_id);
if player_exists_result.is_err() || !player_exists_result.unwrap() {
// player doesn't exist
return Ok((false, false, true));
@ -271,17 +271,24 @@ impl DBHandler {
}
}
fn check_if_player_exists(&self, player_id: u32) -> Result<bool, String> {
let conn = self.get_conn(DBFirstRun::NotFirstRun)?;
let check_player_row =
conn.query_row("SELECT id FROM players WHERE id = ?;", [player_id], |row| {
row.get::<usize, u32>(0)
});
if let Ok(_id) = check_player_row {
Ok(true)
fn check_if_player_exists(
&self,
conn: Option<&Connection>,
player_id: u32,
) -> Result<bool, String> {
if let Some(conn) = conn {
let check_player_row =
conn.query_row("SELECT id FROM players WHERE id = ?;", [player_id], |row| {
row.get::<usize, u32>(0)
});
if let Ok(_id) = check_player_row {
Ok(true)
} else {
Ok(false)
}
} else {
Ok(false)
let conn = self.get_conn(DBFirstRun::NotFirstRun)?;
self.check_if_player_exists(Some(&conn), player_id)
}
}
}