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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;
use chrono::NaiveDateTime;
#[cfg(feature = "mysql")]
use failure::ResultExt;
use super::error::*;
#[cfg_attr(feature = "mysql", derive(Queryable))]
#[derive(PartialEq, Clone, Debug)]
pub struct TellMessage {
pub id: i64,
pub sender: String,
pub receiver: String,
pub time: NaiveDateTime,
pub message: String,
}
#[cfg_attr(feature = "mysql", derive(Insertable))]
#[cfg_attr(feature = "mysql", table_name = "tells")]
pub struct NewTellMessage<'a> {
pub sender: &'a str,
pub receiver: &'a str,
pub time: NaiveDateTime,
pub message: &'a str,
}
pub trait Database: Send {
fn insert_tell(&mut self, tell: &NewTellMessage) -> Result<(), TellError>;
fn get_tells(&self, receiver: &str) -> Result<Vec<TellMessage>, TellError>;
fn delete_tells(&mut self, receiver: &str) -> Result<(), TellError>;
}
// HashMap
impl Database for HashMap<String, Vec<TellMessage>> {
fn insert_tell(&mut self, tell: &NewTellMessage) -> Result<(), TellError> {
let tell = TellMessage {
id: 0,
sender: tell.sender.to_string(),
receiver: tell.receiver.to_string(),
time: tell.time,
message: tell.message.to_string(),
};
let receiver = tell.receiver.clone();
let tell_messages = self.entry(receiver)
.or_insert_with(|| Vec::with_capacity(3));
(*tell_messages).push(tell);
Ok(())
}
fn get_tells(&self, receiver: &str) -> Result<Vec<TellMessage>, TellError> {
Ok(self.get(receiver).cloned().ok_or(ErrorKind::NotFound)?)
}
fn delete_tells(&mut self, receiver: &str) -> Result<(), TellError> {
match self.remove(receiver) {
Some(_) => Ok(()),
None => Err(ErrorKind::NotFound)?,
}
}
}
// Diesel automatically defines the tells module as public.
// We create a schema module to keep it private.
#[cfg(feature = "mysql")]
mod schema {
table! {
tells (id) {
id -> Bigint,
sender -> Varchar,
receiver -> Varchar,
time -> Timestamp,
message -> Varchar,
}
}
}
#[cfg(feature = "mysql")]
use self::schema::tells;
#[cfg(feature = "mysql")]
impl Database for Arc<Pool<ConnectionManager<MysqlConnection>>> {
fn insert_tell(&mut self, tell: &NewTellMessage) -> Result<(), TellError> {
use diesel;
let conn = &*self.get().expect("Failed to get connection");
diesel::insert_into(tells::table)
.values(tell)
.execute(conn)
.context(ErrorKind::MysqlError)?;
Ok(())
}
fn get_tells(&self, receiver: &str) -> Result<Vec<TellMessage>, TellError> {
use self::tells::columns;
let conn = &*self.get().context(ErrorKind::NoConnection)?;
Ok(tells::table
.filter(columns::receiver.eq(receiver))
.order(columns::time.asc())
.load::<TellMessage>(conn)
.context(ErrorKind::MysqlError)?)
}
fn delete_tells(&mut self, receiver: &str) -> Result<(), TellError> {
use diesel;
use self::tells::columns;
let conn = &*self.get().context(ErrorKind::NoConnection)?;
diesel::delete(tells::table.filter(columns::receiver.eq(receiver)))
.execute(conn)
.context(ErrorKind::MysqlError)?;
Ok(())
}
}
|
