136 lines
4.2 KiB
Rust
136 lines
4.2 KiB
Rust
use rusqlite::{params, OptionalExtension, Params};
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use serde::Serialize;
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use tokio::sync::{
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mpsc::{unbounded_channel, UnboundedReceiver, UnboundedSender},
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oneshot,
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};
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#[derive(Debug)]
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enum Task {
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AddQuote(oneshot::Sender<rusqlite::Result<()>>, Quote),
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GetQuote(
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oneshot::Sender<rusqlite::Result<Option<Quote>>>,
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Option<String>,
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),
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SearchQuotes(oneshot::Sender<rusqlite::Result<Vec<Quote>>>, String, usize),
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}
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pub struct DbExecutor {
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rx: UnboundedReceiver<Task>,
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db: rusqlite::Connection,
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}
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#[derive(Serialize, Debug)]
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pub struct Quote {
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pub author: String,
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pub quote: String,
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}
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impl DbExecutor {
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pub fn create(dbpath: &str) -> rusqlite::Result<(Self, ExecutorConnection)> {
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let (tx, rx) = unbounded_channel();
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let db = rusqlite::Connection::open(dbpath)?;
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db.execute(
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"create table if not exists quotes(id integer primary key, username text not null, quote text not null)",
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[],
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)?;
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tracing::debug!("Database connected ({})", dbpath);
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Ok((Self { rx, db }, ExecutorConnection { tx }))
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}
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pub fn run(mut self) {
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while let Some(task) = self.rx.blocking_recv() {
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match task {
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Task::AddQuote(tx, quote) => {
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let result = self
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.db
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.execute(
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"insert into quotes(quote,username) values(?,?)",
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params![quote.quote, quote.author],
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)
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.map(|_| ());
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tx.send(result).unwrap();
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}
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Task::GetQuote(tx, author) => {
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let result = if let Some(ref author) = author {
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self.db.query_row("select quote,username from quotes where username=? order by random() limit 1", params![author], |v| Ok(Quote {quote:v.get(0)?, author:v.get(1)?}))
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} else {
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self.db.query_row("select quote,username from quotes order by random() limit 1", params![], |v| Ok(Quote {quote:v.get(0)?, author:v.get(1)?}))
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}.optional();
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tx.send(result).unwrap();
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}
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Task::SearchQuotes(tx, query, limit) => {
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tx.send(self.yield_quotes("select quote,username from quotes where quote like '%'||?1||'%' order by quote asc limit ?", params![query, limit])).unwrap();
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}
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}
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}
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}
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fn yield_quotes<P: Params>(&self, sql: &str, params: P) -> rusqlite::Result<Vec<Quote>> {
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self.db.prepare(sql).and_then(|mut v| {
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v.query(params).and_then(|mut v| {
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let mut quotes: Vec<Quote> = Vec::new();
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while let Some(row) = v.next()? {
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quotes.push(Quote {
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quote: row.get(0)?,
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author: row.get(1)?,
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});
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}
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Ok(quotes)
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})
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})
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}
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}
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pub struct ExecutorConnection {
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tx: UnboundedSender<Task>,
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}
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impl Clone for ExecutorConnection {
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fn clone(&self) -> Self {
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Self {
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tx: self.tx.clone(),
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}
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}
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}
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macro_rules! executor_wrapper {
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($name:ident, $task:expr, $ret:ty, $($arg:ident: $ty:ty),*) => {
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pub async fn $name(&self, $($arg: $ty),*) -> $ret {
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let (otx, orx) = oneshot::channel();
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self.tx.send($task(otx, $($arg),*)).unwrap();
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orx.await.unwrap()
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}
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};
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($name:ident, $task:expr, $ret:ty) => {
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pub async fn $name(&self) -> $ret {
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let (otx, orx) = oneshot::channel();
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self.tx.send($task(otx)).unwrap();
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orx.await.unwrap()
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}
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};
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}
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impl ExecutorConnection {
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// WARNING: these methods are NOT cancel-safe
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executor_wrapper!(
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add_quote,
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Task::AddQuote,
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rusqlite::Result<()>,
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quote: Quote
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);
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executor_wrapper!(
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get_quote,
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Task::GetQuote,
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rusqlite::Result<Option<Quote>>,
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author: Option<String>
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);
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executor_wrapper!(
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search_quotes,
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Task::SearchQuotes,
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rusqlite::Result<Vec<Quote>>,
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query: String,
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limit: usize
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);
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}
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