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#[cfg(feature = "mysql")]
extern crate dotenv;
#[cfg(feature = "mysql")]
use std::sync::Arc;
use std::collections::HashMap;
#[cfg(feature = "mysql")]
use diesel::prelude::*;
#[cfg(feature = "mysql")]
use diesel::mysql::MysqlConnection;
#[cfg(feature = "mysql")]
use r2d2::Pool;
#[cfg(feature = "mysql")]
use r2d2_diesel::ConnectionManager;
#[cfg(feature = "mysql")]
use failure::ResultExt;
use chrono::NaiveDateTime;
use super::error::*;
#[cfg_attr(feature = "mysql", derive(Queryable))]
#[derive(Clone, Debug)]
pub struct Factoid {
pub name: 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 = "factoids")]
pub struct NewFactoid<'a> {
pub name: &'a str,
pub idx: i32,
pub content: &'a str,
pub author: &'a str,
pub created: NaiveDateTime,
}
pub trait Database: Send {
fn insert_factoid(&mut self, factoid: &NewFactoid) -> Result<(), FactoidsError>;
fn get_factoid(&self, name: &str, idx: i32) -> Result<Factoid, FactoidsError>;
fn delete_factoid(&mut self, name: &str, idx: i32) -> Result<(), FactoidsError>;
fn count_factoids(&self, name: &str) -> Result<i32, FactoidsError>;
}
// HashMap
impl Database for HashMap<(String, i32), Factoid> {
fn insert_factoid(&mut self, factoid: &NewFactoid) -> Result<(), FactoidsError> {
let factoid = Factoid {
name: String::from(factoid.name),
idx: factoid.idx,
content: factoid.content.to_string(),
author: factoid.author.to_string(),
created: factoid.created,
};
let name = factoid.name.clone();
match self.insert((name, factoid.idx), factoid) {
None => Ok(()),
Some(_) => Err(ErrorKind::Duplicate)?,
}
}
fn get_factoid(&self, name: &str, idx: i32) -> Result<Factoid, FactoidsError> {
Ok(self.get(&(String::from(name), idx))
.cloned()
.ok_or(ErrorKind::NotFound)?)
}
fn delete_factoid(&mut self, name: &str, idx: i32) -> Result<(), FactoidsError> {
match self.remove(&(String::from(name), idx)) {
Some(_) => Ok(()),
None => Err(ErrorKind::NotFound)?,
}
}
fn count_factoids(&self, name: &str) -> Result<i32, FactoidsError> {
Ok(self.iter().filter(|&(&(ref n, _), _)| n == name).count() as i32)
}
}
// Diesel automatically defines the factoids module as public.
// We create a schema module to keep it private.
#[cfg(feature = "mysql")]
mod schema {
table! {
factoids (name, idx) {
name -> Varchar,
idx -> Integer,
content -> Text,
author -> Varchar,
created -> Timestamp,
}
}
}
#[cfg(feature = "mysql")]
use self::schema::factoids;
#[cfg(feature = "mysql")]
impl Database for Arc<Pool<ConnectionManager<MysqlConnection>>> {
fn insert_factoid(&mut self, factoid: &NewFactoid) -> Result<(), FactoidsError> {
use diesel;
let conn = &*self.get().context(ErrorKind::NoConnection)?;
diesel::insert_into(factoids::table)
.values(factoid)
.execute(conn)
.context(ErrorKind::MysqlError)?;
Ok(())
}
fn get_factoid(&self, name: &str, idx: i32) -> Result<Factoid, FactoidsError> {
let conn = &*self.get().context(ErrorKind::NoConnection)?;
Ok(factoids::table
.find((name, idx))
.first(conn)
.context(ErrorKind::MysqlError)?)
}
fn delete_factoid(&mut self, name: &str, idx: i32) -> Result<(), FactoidsError> {
use diesel;
use self::factoids::columns;
let conn = &*self.get().context(ErrorKind::NoConnection)?;
match diesel::delete(
factoids::table
.filter(columns::name.eq(name))
.filter(columns::idx.eq(idx)),
).execute(conn)
{
Ok(v) => {
if v > 0 {
Ok(())
} else {
Err(ErrorKind::NotFound)?
}
}
Err(e) => Err(e).context(ErrorKind::MysqlError)?,
}
}
fn count_factoids(&self, name: &str) -> Result<i32, FactoidsError> {
use diesel;
let conn = &*self.get().context(ErrorKind::NoConnection)?;
let count: Result<i64, _> = factoids::table
.filter(factoids::columns::name.eq(name))
.count()
.get_result(conn);
match count {
Ok(c) => Ok(c as i32),
Err(diesel::NotFound) => Ok(0),
Err(e) => Err(e).context(ErrorKind::MysqlError)?,
}
}
}
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