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|
use crate::errors::Error;
use postgres::{Client, NoTls};
use std::sync::{Arc, Mutex};
lazy_static! {
static ref CLIENT: Arc<Mutex<Client>> = Arc::new(Mutex::new(
Client::connect("host=track_db user=postgres password=example", NoTls)
.expect("failed to connect to database")
));
}
fn initialize_db() -> Result<(), Error> {
let mut client = CLIENT.lock()?;
client.batch_execute(
r#"
CREATE TABLE IF NOT EXISTS track (
track_id SERIAL PRIMARY KEY,
track_code TEXT NOT NULL UNIQUE,
name TEXT NOT NULL,
artist TEXT NOT NULL,
popularity int DEFAULT 50
);
CREATE TABLE IF NOT EXISTS suser (
user_id SERIAL PRIMARY KEY,
user_name TEXT NOT NULL UNIQUE
);
CREATE TABLE IF NOT EXISTS user_track_raw (
track_id int REFERENCES track (track_id) ON UPDATE CASCADE ON DELETE CASCADE,
user_id int REFERENCES suser (user_id) ON UPDATE CASCADE ON DELETE CASCADE,
count int NOT NULL DEFAULT 1,
CONSTRAINT track_user_pkey PRIMARY KEY (track_id, user_id)
);
CREATE OR REPLACE VIEW user_track AS (
SELECT *, "count" / (
SELECT SUM("count")
FROM user_track ut
WHERE ut.user_id = user_id
)::decimal AS score
FROM user_track
);
"#,
)?;
Ok(())
}
use rspotify::spotify::model::track::FullTrack;
pub fn insert_track(user_id: i32, track: FullTrack, weight: i32) -> Result<(), Error> {
let mut client = CLIENT.lock()?;
if track.id.is_none() {
println!("{:#?}", track);
return Err("failed to load get track information".into());
}
print!(" {} ", track.id.clone()?);
client.execute(
"INSERT INTO track (track_code, name, artist, popularity)
VALUES ($1, $2, $3, $4)
ON CONFLICT DO NOTHING",
&[
&(track.id.clone()?),
&track.name,
&track.artists[0].name,
&(track.popularity as i32),
],
)?;
let track_id: i32 = client.query(
"SELECT track_id FROM track where track_code = $1;",
&[&(track.id?)],
)?[0]
.get(0);
println!("uid: {} tid: {}", user_id, track_id);
client.execute(
"
INSERT INTO user_track_raw (track_id, user_id, count)
VALUES ($1, $2, $3)
ON CONFLICT
ON CONSTRAINT track_user_pkey
DO NOTHING;
",
&[&track_id, &user_id, &0],
)?;
client.execute(
"UPDATE user_track SET count = count + $3 WHERE track_id = $1 AND user_id = $2;",
&[&track_id, &user_id, &weight],
)?;
Ok(())
}
pub fn insert_user(name: &str) -> Result<i32, Error> {
let mut client = CLIENT.lock()?;
client.execute(
"INSERT INTO suser (user_name) VALUES ($1) ON CONFLICT (user_name) DO NOTHING;",
&[&name],
)?;
let db_user_id = get_uid(name, &mut *client)?;
client.execute("DELETE FROM user_track WHERE user_id = $1;", &[&db_user_id])?;
Ok(db_user_id)
}
fn get_uid(name: &str, client: &mut postgres::Client) -> Result<i32, Error> {
let x: i32 = client
.query_one("SELECT user_id FROM suser where user_name = $1;", &[&name])?
.get(0);
Ok(x)
}
pub fn match_users(name1: String, name2: String) -> Result<String, Error> {
let mut client = CLIENT.lock()?;
let mut songs = String::new();
for row in client.query(
"
WITH users AS (
SELECT *
FROM ( VALUES
($1), ($2)
) AS _ (user_id)
)
SELECT track_id, name, artist
FROM track
JOIN (
SELECT track_id
FROM user_track
JOIN suser USING (user_id)
JOIN track USING (track_id)
WHERE suser.user_name IN (SELECT * FROM users)
GROUP BY track_id
HAVING COUNT(track_id) = (SELECT COUNT(*) FROM users)
ORDER BY SUM(score) DESC
) AS _ USING (track_id)
;
",
&[&name1.as_str(), &name2.as_str()],
)? {
let name: String = row.get(1);
let artist: String = row.get(2);
songs = format!("{}{} by {}\n", songs, name, artist);
}
Ok(songs)
}
pub fn get_users() -> Result<String, Error> {
let mut client = CLIENT.lock()?;
let mut users = String::new();
for row in client.query("SELECT user_name FROM suser", &[])? {
let user: String = row.get(0);
users = format!("{}{}\n", users, user);
}
Ok(users)
}
|
