318 lines
9.1 KiB
Rust
318 lines
9.1 KiB
Rust
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// Copyright (C) 2018-2021 Vincent Ambo <tazjin@tvl.su>
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//
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// This file is part of Converse.
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//
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// This program is free software: you can redistribute it and/or
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// modify it under the terms of the GNU General Public License as
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// published by the Free Software Foundation, either version 3 of the
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// License, or (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see
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// <https://www.gnu.org/licenses/>.
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//! This module implements the database executor, which holds the
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//! database connection and performs queries on it.
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use crate::errors::{ConverseError, Result};
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use crate::models::*;
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use actix::prelude::*;
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use diesel::prelude::*;
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use diesel::r2d2::{ConnectionManager, Pool};
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use diesel::sql_types::Text;
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use diesel::{self, sql_query};
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/// Raw PostgreSQL query used to perform full-text search on posts
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/// with a supplied phrase. For now, the query language is hardcoded
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/// to English and only "plain" queries (i.e. no searches for exact
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/// matches or more advanced query syntax) are supported.
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const SEARCH_QUERY: &'static str = r#"
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WITH search_query (query) AS (VALUES (plainto_tsquery('english', $1)))
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SELECT post_id,
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thread_id,
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author,
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title,
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ts_headline('english', body, query) AS headline
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FROM search_index, search_query
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WHERE document @@ query
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ORDER BY ts_rank(document, query) DESC
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LIMIT 50
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"#;
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const REFRESH_QUERY: &'static str = "REFRESH MATERIALIZED VIEW search_index";
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pub struct DbExecutor(pub Pool<ConnectionManager<PgConnection>>);
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impl DbExecutor {
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/// Request a list of threads.
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// TODO(tazjin): This should support pagination.
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pub fn list_threads(&self) -> Result<Vec<ThreadIndex>> {
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use crate::schema::thread_index::dsl::*;
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let conn = self.0.get()?;
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let results = thread_index.load::<ThreadIndex>(&conn)?;
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Ok(results)
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}
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/// Look up a user based on their email-address. If the user does
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/// not exist, it is created.
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pub fn lookup_or_create_user(&self, user_email: &str, user_name: &str) -> Result<User> {
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use crate::schema::users;
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use crate::schema::users::dsl::*;
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let conn = self.0.get()?;
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let opt_user = users.filter(email.eq(email)).first(&conn).optional()?;
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if let Some(user) = opt_user {
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Ok(user)
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} else {
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let new_user = NewUser {
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email: user_email.to_string(),
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name: user_name.to_string(),
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};
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let user: User = diesel::insert_into(users::table)
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.values(&new_user)
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.get_result(&conn)?;
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info!("Created new user {} with ID {}", new_user.email, user.id);
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Ok(user)
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}
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}
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/// Fetch a specific thread and return it with its posts.
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pub fn get_thread(&self, thread_id: i32) -> Result<(Thread, Vec<SimplePost>)> {
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use crate::schema::simple_posts::dsl::id;
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use crate::schema::threads::dsl::*;
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let conn = self.0.get()?;
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let thread_result: Thread = threads.find(thread_id).first(&conn)?;
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let post_list = SimplePost::belonging_to(&thread_result)
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.order_by(id.asc())
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.load::<SimplePost>(&conn)?;
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Ok((thread_result, post_list))
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}
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/// Fetch a specific post.
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pub fn get_post(&self, post_id: i32) -> Result<SimplePost> {
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use crate::schema::simple_posts::dsl::*;
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let conn = self.0.get()?;
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Ok(simple_posts.find(post_id).first(&conn)?)
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}
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/// Update the content of a post.
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pub fn update_post(&self, post_id: i32, post_text: String) -> Result<Post> {
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use crate::schema::posts::dsl::*;
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let conn = self.0.get()?;
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let updated = diesel::update(posts.find(post_id))
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.set(body.eq(post_text))
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.get_result(&conn)?;
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Ok(updated)
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}
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/// Create a new thread.
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pub fn create_thread(&self, new_thread: NewThread, post_text: String) -> Result<Thread> {
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use crate::schema::{posts, threads};
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let conn = self.0.get()?;
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conn.transaction::<Thread, ConverseError, _>(|| {
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// First insert the thread structure itself
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let thread: Thread = diesel::insert_into(threads::table)
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.values(&new_thread)
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.get_result(&conn)?;
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// ... then create the first post in the thread.
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let new_post = NewPost {
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thread_id: thread.id,
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body: post_text,
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user_id: new_thread.user_id,
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};
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diesel::insert_into(posts::table)
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.values(&new_post)
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.execute(&conn)?;
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Ok(thread)
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})
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}
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/// Create a new post.
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pub fn create_post(&self, new_post: NewPost) -> Result<Post> {
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use crate::schema::posts;
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let conn = self.0.get()?;
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let closed: bool = {
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use crate::schema::threads::dsl::*;
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threads
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.select(closed)
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.find(new_post.thread_id)
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.first(&conn)?
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};
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if closed {
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return Err(ConverseError::ThreadClosed {
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id: new_post.thread_id,
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});
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}
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Ok(diesel::insert_into(posts::table)
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.values(&new_post)
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.get_result(&conn)?)
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}
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/// Search for posts.
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pub fn search_posts(&self, query: String) -> Result<Vec<SearchResult>> {
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let conn = self.0.get()?;
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let search_results = sql_query(SEARCH_QUERY)
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.bind::<Text, _>(query)
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.get_results::<SearchResult>(&conn)?;
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Ok(search_results)
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}
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/// Trigger a refresh of the view used for full-text searching.
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pub fn refresh_search_view(&self) -> Result<()> {
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let conn = self.0.get()?;
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debug!("Refreshing search_index view in DB");
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sql_query(REFRESH_QUERY).execute(&conn)?;
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Ok(())
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}
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}
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// Old actor implementation:
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impl Actor for DbExecutor {
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type Context = SyncContext<Self>;
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}
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/// Message used to look up a user based on their email-address. If
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/// the user does not exist, it is created.
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pub struct LookupOrCreateUser {
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pub email: String,
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pub name: String,
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}
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message!(LookupOrCreateUser, Result<User>);
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impl Handler<LookupOrCreateUser> for DbExecutor {
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type Result = <LookupOrCreateUser as Message>::Result;
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fn handle(&mut self, _: LookupOrCreateUser, _: &mut Self::Context) -> Self::Result {
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unimplemented!()
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}
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}
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/// Message used to fetch a specific thread. Returns the thread and
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/// its posts.
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pub struct GetThread(pub i32);
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message!(GetThread, Result<(Thread, Vec<SimplePost>)>);
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impl Handler<GetThread> for DbExecutor {
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type Result = <GetThread as Message>::Result;
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fn handle(&mut self, _: GetThread, _: &mut Self::Context) -> Self::Result {
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unimplemented!()
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}
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}
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/// Message used to fetch a specific post.
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#[derive(Deserialize, Debug)]
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pub struct GetPost {
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pub id: i32,
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}
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message!(GetPost, Result<SimplePost>);
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impl Handler<GetPost> for DbExecutor {
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type Result = <GetPost as Message>::Result;
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fn handle(&mut self, _: GetPost, _: &mut Self::Context) -> Self::Result {
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unimplemented!()
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}
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}
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/// Message used to update the content of a post.
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#[derive(Deserialize)]
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pub struct UpdatePost {
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pub post_id: i32,
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pub post: String,
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}
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message!(UpdatePost, Result<Post>);
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impl Handler<UpdatePost> for DbExecutor {
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type Result = Result<Post>;
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fn handle(&mut self, _: UpdatePost, _: &mut Self::Context) -> Self::Result {
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unimplemented!()
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}
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}
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/// Message used to create a new thread
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pub struct CreateThread {
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pub new_thread: NewThread,
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pub post: String,
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}
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message!(CreateThread, Result<Thread>);
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impl Handler<CreateThread> for DbExecutor {
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type Result = <CreateThread as Message>::Result;
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fn handle(&mut self, _: CreateThread, _: &mut Self::Context) -> Self::Result {
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unimplemented!()
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}
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}
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/// Message used to create a new reply
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pub struct CreatePost(pub NewPost);
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message!(CreatePost, Result<Post>);
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impl Handler<CreatePost> for DbExecutor {
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type Result = <CreatePost as Message>::Result;
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fn handle(&mut self, _: CreatePost, _: &mut Self::Context) -> Self::Result {
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unimplemented!()
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}
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}
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/// Message used to search for posts
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#[derive(Deserialize)]
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pub struct SearchPosts {
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pub query: String,
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}
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message!(SearchPosts, Result<Vec<SearchResult>>);
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impl Handler<SearchPosts> for DbExecutor {
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type Result = <SearchPosts as Message>::Result;
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fn handle(&mut self, _: SearchPosts, _: &mut Self::Context) -> Self::Result {
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unimplemented!()
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}
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}
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/// Message that triggers a refresh of the view used for full-text
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/// searching.
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pub struct RefreshSearchView;
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message!(RefreshSearchView, Result<()>);
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impl Handler<RefreshSearchView> for DbExecutor {
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type Result = Result<()>;
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fn handle(&mut self, _: RefreshSearchView, _: &mut Self::Context) -> Self::Result {
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unimplemented!()
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}
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}
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