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// Copyright (C) 2018 Vincent Ambo <mail@tazj.in>
//
// Converse is free software: you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// This program is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with this program. If not, see
// <http://www.gnu.org/licenses/>.
//! This module implements the database connection actor.
use actix::prelude::*;
use diesel::{self, sql_query};
use diesel::sql_types::Text;
use diesel::prelude::*;
use diesel::r2d2::{Pool, ConnectionManager};
use models::*;
use errors::{ConverseError, Result};
/// The DB actor itself. Several of these will be run in parallel by
/// `SyncArbiter`.
pub struct DbExecutor(pub Pool<ConnectionManager<PgConnection>>);
impl Actor for DbExecutor {
type Context = SyncContext<Self>;
}
/// Message used to request a list of threads.
/// TODO: This should support page numbers.
pub struct ListThreads;
impl Message for ListThreads {
type Result = Result<Vec<ThreadIndex>>;
}
impl Handler<ListThreads> for DbExecutor {
type Result = <ListThreads as Message>::Result;
fn handle(&mut self, _: ListThreads, _: &mut Self::Context) -> Self::Result {
use schema::thread_index::dsl::*;
let conn = self.0.get()?;
let results = thread_index
.load::<ThreadIndex>(&conn)?;
Ok(results)
}
}
/// Message used to fetch a specific thread. Returns the thread and
/// its posts.
pub struct GetThread(pub i32);
impl Message for GetThread {
type Result = Result<(Thread, Vec<Post>)>;
}
impl Handler<GetThread> for DbExecutor {
type Result = <GetThread as Message>::Result;
fn handle(&mut self, msg: GetThread, _: &mut Self::Context) -> Self::Result {
use schema::threads::dsl::*;
let conn = self.0.get()?;
let thread_result: Thread = threads
.find(msg.0).first(&conn)?;
let post_list = Post::belonging_to(&thread_result).load::<Post>(&conn)?;
Ok((thread_result, post_list))
}
}
/// Message used to create a new thread
pub struct CreateThread {
pub new_thread: NewThread,
pub body: String,
}
impl Message for CreateThread {
type Result = Result<Thread>;
}
impl Handler<CreateThread> for DbExecutor {
type Result = <CreateThread as Message>::Result;
fn handle(&mut self, msg: CreateThread, _: &mut Self::Context) -> Self::Result {
use schema::threads;
use schema::posts;
let conn = self.0.get()?;
conn.transaction::<Thread, ConverseError, _>(|| {
// First insert the thread structure itself
let thread: Thread = diesel::insert_into(threads::table)
.values(&msg.new_thread)
.get_result(&conn)?;
// ... then create the first post in the thread.
let new_post = NewPost {
thread_id: thread.id,
body: msg.body,
author_name: msg.new_thread.author_name.clone(),
author_email: msg.new_thread.author_email.clone(),
};
diesel::insert_into(posts::table)
.values(&new_post)
.execute(&conn)?;
Ok(thread)
})
}
}
/// Message used to create a new reply
pub struct CreatePost(pub NewPost);
impl Message for CreatePost {
type Result = Result<Post>;
}
impl Handler<CreatePost> for DbExecutor {
type Result = <CreatePost as Message>::Result;
fn handle(&mut self, msg: CreatePost, _: &mut Self::Context) -> Self::Result {
use schema::posts;
let conn = self.0.get()?;
Ok(diesel::insert_into(posts::table)
.values(&msg.0)
.get_result(&conn)?)
}
}
/// Message used to search for posts
#[derive(Deserialize)]
pub struct SearchPosts { pub query: String }
impl Message for SearchPosts {
type Result = Result<Vec<SearchResult>>;
}
/// Raw PostgreSQL query used to perform full-text search on posts
/// with a supplied phrase. For now, the query language is hardcoded
/// to English and only "plain" queries (i.e. no searches for exact
/// matches or more advanced query syntax) are supported.
const SEARCH_QUERY: &'static str = r#"
WITH search_query (query) AS (VALUES (plainto_tsquery('english', $1)))
SELECT post_id,
thread_id,
author,
title,
ts_headline('english', body, query) AS headline
FROM search_index, search_query
WHERE document @@ query
ORDER BY ts_rank(document, query) DESC
"#;
impl Handler<SearchPosts> for DbExecutor {
type Result = <SearchPosts as Message>::Result;
fn handle(&mut self, msg: SearchPosts, _: &mut Self::Context) -> Self::Result {
let conn = self.0.get()?;
let search_results = sql_query(SEARCH_QUERY)
.bind::<Text, _>(msg.query)
.get_results::<SearchResult>(&conn)?;
Ok(search_results)
}
}
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