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use std::collections::HashMap;
#[cfg(feature = "mysql")]
use std::sync::Arc;
#[cfg(feature = "mysql")]
use diesel::mysql::MysqlConnection;
#[cfg(feature = "mysql")]
use diesel::prelude::*;
#[cfg(feature = "mysql")]
use failure::ResultExt;
#[cfg(feature = "mysql")]
use r2d2::Pool;
#[cfg(feature = "mysql")]
use r2d2_diesel::ConnectionManager;
use chrono::NaiveDateTime;
use super::error::*;
#[cfg_attr(feature = "mysql", derive(Queryable))]
#[derive(Clone, Debug)]
pub struct Quote {
pub quotee: String,
pub channel: String,
pub idx: i32,
pub content: String,
pub author: String,
pub created: NaiveDateTime,
}
#[cfg_attr(feature = "mysql", derive(Insertable))]
#[cfg_attr(feature = "mysql", table_name = "quotes")]
pub struct NewQuote<'a> {
pub quotee: &'a str,
pub channel: &'a str,
pub idx: i32,
pub content: &'a str,
pub author: &'a str,
pub created: NaiveDateTime,
}
pub trait Database: Send + Sync {
fn insert_quote(&mut self, quote: &NewQuote) -> Result<(), QuoteError>;
fn get_quote(&self, quotee: &str, channel: &str, idx: i32) -> Result<Quote, QuoteError>;
fn count_quotes(&self, quotee: &str, channel: &str) -> Result<i32, QuoteError>;
}
// HashMap
impl<S: ::std::hash::BuildHasher + Send + Sync> Database
for HashMap<(String, String, i32), Quote, S>
{
fn insert_quote(&mut self, quote: &NewQuote) -> Result<(), QuoteError> {
let quote = Quote {
quotee: quote.quotee.to_owned(),
channel: quote.channel.to_owned(),
idx: quote.idx,
content: quote.content.to_owned(),
author: quote.author.to_owned(),
created: quote.created,
};
let quotee = quote.quotee.clone();
let channel = quote.channel.clone();
match self.insert((quotee, channel, quote.idx), quote) {
None => Ok(()),
Some(_) => Err(ErrorKind::Duplicate)?,
}
}
fn get_quote(&self, quotee: &str, channel: &str, idx: i32) -> Result<Quote, QuoteError> {
Ok(self
.get(&(quotee.to_owned(), channel.to_owned(), idx))
.cloned()
.ok_or(ErrorKind::NotFound)?)
}
fn count_quotes(&self, quotee: &str, channel: &str) -> Result<i32, QuoteError> {
Ok(self
.iter()
.filter(|&(&(ref n, ref c, _), _)| n == quotee && c == channel)
.count() as i32)
}
}
// Diesel automatically defines the quotes module as public.
// We create a schema module to keep it private.
#[cfg(feature = "mysql")]
mod schema {
table! {
quotes (quotee, channel, idx) {
quotee -> Varchar,
channel -> Varchar,
idx -> Integer,
content -> Text,
author -> Varchar,
created -> Timestamp,
}
}
}
#[cfg(feature = "mysql")]
use self::schema::quotes;
#[cfg(feature = "mysql")]
impl Database for Arc<Pool<ConnectionManager<MysqlConnection>>> {
fn insert_quote(&mut self, quote: &NewQuote) -> Result<(), QuoteError> {
use diesel;
let conn = &*self.get().context(ErrorKind::NoConnection)?;
diesel::insert_into(quotes::table)
.values(quote)
.execute(conn)
.context(ErrorKind::MysqlError)?;
Ok(())
}
fn get_quote(&self, quotee: &str, channel: &str, idx: i32) -> Result<Quote, QuoteError> {
let conn = &*self.get().context(ErrorKind::NoConnection)?;
Ok(quotes::table
.find((quotee, channel, idx))
.first(conn)
.context(ErrorKind::MysqlError)?)
}
fn count_quotes(&self, quotee: &str, channel: &str) -> Result<i32, QuoteError> {
use diesel;
let conn = &*self.get().context(ErrorKind::NoConnection)?;
let count: Result<i64, _> = quotes::table
.filter(quotes::columns::quotee.eq(quotee))
.filter(quotes::columns::channel.eq(channel))
.count()
.get_result(conn);
match count {
Ok(c) => Ok(c as i32),
Err(diesel::NotFound) => Ok(0),
Err(e) => Err(e).context(ErrorKind::MysqlError)?,
}
}
}
|
