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use std::collections::HashMap;
use std::collections::hash_map::Entry;
use std::fmt;
#[cfg(feature = "mysql")]
use std::sync::Arc;
#[cfg(feature = "mysql")]
use diesel::mysql::MysqlConnection;
#[cfg(feature = "mysql")]
use diesel::prelude::*;
#[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(feature = "mysql")]
static LAST_ID_SQL: &'static str = "SELECT LAST_INSERT_ID()";
#[cfg_attr(feature = "mysql", derive(Queryable))]
#[derive(Clone, Debug)]
pub struct Event {
pub id: i64,
pub receiver: String,
pub content: String,
pub author: String,
pub time: NaiveDateTime,
pub repeat: Option<i64>,
}
impl fmt::Display for Event {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(
f,
"{}: {} reminds {} to \"{}\" at {}",
self.id, self.author, self.receiver, self.content, self.time
)
}
}
#[cfg_attr(feature = "mysql", derive(Insertable))]
#[cfg_attr(feature = "mysql", table_name = "events")]
#[derive(Debug)]
pub struct NewEvent<'a> {
pub receiver: &'a str,
pub content: &'a str,
pub author: &'a str,
pub time: &'a NaiveDateTime,
pub repeat: Option<i64>,
}
pub trait Database: Send + Sync {
fn insert_event(&mut self, event: &NewEvent) -> Result<i64, RemindError>;
fn update_event_time(&mut self, id: i64, time: &NaiveDateTime) -> Result<(), RemindError>;
fn get_events_before(&self, time: &NaiveDateTime) -> Result<Vec<Event>, RemindError>;
fn get_user_events(&self, user: &str) -> Result<Vec<Event>, RemindError>;
fn get_event(&self, id: i64) -> Result<Event, RemindError>;
fn delete_event(&mut self, id: i64) -> Result<(), RemindError>;
}
// HashMap
impl Database for HashMap<i64, Event> {
fn insert_event(&mut self, event: &NewEvent) -> Result<i64, RemindError> {
let mut id = 0;
while self.contains_key(&id) {
id += 1;
}
let event = Event {
id: id,
receiver: event.receiver.to_owned(),
content: event.content.to_owned(),
author: event.author.to_owned(),
time: event.time.clone(),
repeat: event.repeat,
};
match self.insert(id, event) {
None => Ok(id),
Some(_) => Err(ErrorKind::Duplicate)?,
}
}
fn update_event_time(&mut self, id: i64, time: &NaiveDateTime) -> Result<(), RemindError> {
let entry = self.entry(id);
match entry {
Entry::Occupied(mut v) => v.get_mut().time = *time,
Entry::Vacant(_) => return Err(ErrorKind::NotFound.into()),
}
Ok(())
}
fn get_events_before(&self, time: &NaiveDateTime) -> Result<Vec<Event>, RemindError> {
let mut events = Vec::new();
for (_, event) in self.iter() {
if &event.time < time {
events.push(event.clone())
}
}
if events.is_empty() {
Err(ErrorKind::NotFound.into())
} else {
Ok(events)
}
}
fn get_user_events(&self, user: &str) -> Result<Vec<Event>, RemindError> {
let mut events = Vec::new();
for (_, event) in self.iter() {
if event.receiver.eq_ignore_ascii_case(user) {
events.push(event.clone())
}
}
if events.is_empty() {
Err(ErrorKind::NotFound.into())
} else {
Ok(events)
}
}
fn get_event(&self, id: i64) -> Result<Event, RemindError> {
Ok(self.get(&id)
.map(|ev| ev.clone())
.ok_or(ErrorKind::NotFound)?)
}
fn delete_event(&mut self, id: i64) -> Result<(), RemindError> {
match self.remove(&id) {
Some(_) => Ok(()),
None => Err(ErrorKind::NotFound)?,
}
}
}
#[cfg(feature = "mysql")]
mod schema {
table! {
events (id) {
id -> Bigint,
receiver -> Varchar,
content -> Text,
author -> Varchar,
time -> Timestamp,
repeat -> Nullable<Bigint>,
}
}
}
#[cfg(feature = "mysql")]
use self::schema::events;
#[cfg(feature = "mysql")]
impl Database for Arc<Pool<ConnectionManager<MysqlConnection>>> {
fn insert_event(&mut self, event: &NewEvent) -> Result<i64, RemindError> {
use diesel::{self, dsl::sql, types::Bigint};
let conn = &*self.get().context(ErrorKind::NoConnection)?;
diesel::insert_into(events::table)
.values(event)
.execute(conn)
.context(ErrorKind::MysqlError)?;
let id = sql::<Bigint>(LAST_ID_SQL)
.get_result(conn)
.context(ErrorKind::MysqlError)?;
Ok(id)
}
fn update_event_time(&mut self, id: i64, time: &NaiveDateTime) -> Result<(), RemindError> {
use self::events::columns;
use diesel;
let conn = &*self.get().context(ErrorKind::NoConnection)?;
match diesel::update(events::table.filter(columns::id.eq(id)))
.set(columns::time.eq(time))
.execute(conn)
{
Ok(0) => Err(ErrorKind::NotFound)?,
Ok(_) => Ok(()),
Err(e) => Err(e).context(ErrorKind::MysqlError)?,
}
}
fn get_events_before(&self, time: &NaiveDateTime) -> Result<Vec<Event>, RemindError> {
use self::events::columns;
let conn = &*self.get().context(ErrorKind::NoConnection)?;
Ok(events::table
.filter(columns::time.lt(time))
.load::<Event>(conn)
.context(ErrorKind::MysqlError)?)
}
fn get_user_events(&self, user: &str) -> Result<Vec<Event>, RemindError> {
use self::events::columns;
let conn = &*self.get().context(ErrorKind::NoConnection)?;
Ok(events::table
.filter(columns::receiver.eq(user))
.load::<Event>(conn)
.context(ErrorKind::MysqlError)?)
}
fn get_event(&self, id: i64) -> Result<Event, RemindError> {
let conn = &*self.get().context(ErrorKind::NoConnection)?;
Ok(events::table
.find(id)
.first(conn)
.context(ErrorKind::MysqlError)?)
}
fn delete_event(&mut self, id: i64) -> Result<(), RemindError> {
use self::events::columns;
use diesel;
let conn = &*self.get().context(ErrorKind::NoConnection)?;
match diesel::delete(events::table.filter(columns::id.eq(id))).execute(conn) {
Ok(0) => Err(ErrorKind::NotFound)?,
Ok(_) => Ok(()),
Err(e) => Err(e).context(ErrorKind::MysqlError)?,
}
}
}
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