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use ::actix::prelude::*;
use diesel::pg::Pg;
use diesel::prelude::*;
use diesel::query_builder::{QueryFragment, QueryId, SelectQuery};
use diesel::query_dsl::{LoadQuery, RunQueryDsl};
use diesel::r2d2;
use diesel::r2d2::{ConnectionManager, Pool};
use diesel::result::Error;
use dotenv::dotenv;
use std::env;
use std::marker::PhantomData;
use log::debug;
pub struct DbExecutor<T: 'static>
where
T: Connection,
{
pub pool: Pool<ConnectionManager<T>>,
}
impl<T: Connection> Actor for DbExecutor<T> {
type Context = SyncContext<Self>;
fn started(&mut self, _ctx: &mut Self::Context) {
debug!("I am alive!");
}
}
pub struct SQuery<S, I> {
pub select: S,
pub phantom: PhantomData<I>,
}
impl<S, I: 'static> Message for SQuery<S, I> {
type Result = Result<Vec<I>, Error>;
}
impl<S: LoadQuery<PgConnection, I> + SelectQuery + QueryFragment<Pg>, I: 'static>
Handler<SQuery<S, I>> for DbExecutor<PgConnection>
{
type Result = Result<Vec<I>, Error>;
fn handle(&mut self, msg: SQuery<S, I>, _: &mut Self::Context) -> Self::Result {
let dbg = diesel::debug_query(&msg.select);
debug!("{:?}", dbg);
let pool = &self.pool;
if let Ok(conn) = pool.get() {
let res = msg.select.load::<I>(&conn);
return res;
}
Ok(Vec::new())
}
}
pub struct WQuery<W, I> {
pub query: W,
pub phantom: PhantomData<I>,
}
impl<W, I: 'static> Message for WQuery<W, I> {
type Result = Result<Vec<I>, Error>;
}
impl<W: LoadQuery<PgConnection, I> + QueryFragment<Pg>, I: 'static> Handler<WQuery<W, I>>
for DbExecutor<PgConnection>
{
type Result = Result<Vec<I>, Error>;
fn handle(&mut self, msg: WQuery<W, I>, _: &mut Self::Context) -> Self::Result {
let dbg = diesel::debug_query(&msg.query);
debug!("{:?}", dbg);
let pool = &self.pool;
if let Ok(conn) = pool.get() {
let res = msg.query.get_results::<I>(&conn);
return res;
}
Ok(Vec::new())
}
}
pub struct AppState {
pub rdb: Addr<DbExecutor<diesel::PgConnection>>,
pub wdb: Addr<DbExecutor<diesel::PgConnection>>,
}
pub enum ConnectionType {
Read,
Write,
}
pub fn db_setup(conn_type: ConnectionType) -> actix::Addr<DbExecutor<diesel::PgConnection>> {
dotenv().ok();
let var = match conn_type {
ConnectionType::Read => "DB_READ_URL",
ConnectionType::Write => "DB_WRITE_URL",
};
let database_url = env::var(var).unwrap_or_else(|_| panic!("{} must be set", var));
let manager = ConnectionManager::<PgConnection>::new(database_url);
let pool = r2d2::Pool::builder()
.max_size(3)
.min_idle(Some(0))
.build(manager)
.expect("Failed to create pool.");
SyncArbiter::start(3, move || DbExecutor { pool: pool.clone() })
}
#[derive(Debug)]
pub enum DbExecutorError {
DatabaseError(diesel::result::Error),
MailBoxError(actix::MailboxError),
Unknown,
}
impl From<diesel::result::Error> for DbExecutorError {
fn from(error: diesel::result::Error) -> Self {
DbExecutorError::DatabaseError(error)
}
}
impl From<actix::MailboxError> for DbExecutorError {
fn from(error: actix::MailboxError) -> Self {
DbExecutorError::MailBoxError(error)
}
}
pub struct Conn;
impl Message for Conn {
type Result = Result<r2d2::PooledConnection<ConnectionManager<PgConnection>>, Error>;
}
impl Handler<Conn> for DbExecutor<PgConnection> {
type Result = Result<r2d2::PooledConnection<ConnectionManager<PgConnection>>, Error>;
fn handle(&mut self, _msg: Conn, _: &mut Self::Context) -> Self::Result {
let pool = &self.pool;
if let Ok(conn) = pool.get() {
return Ok(conn);
}
Err(Error::NotFound)
}
}
pub struct DQuery<D> {
pub query: D,
}
impl<D> Message for DQuery<D> {
type Result = Result<usize, Error>;
}
impl<D: RunQueryDsl<PgConnection> + QueryId + QueryFragment<Pg>> Handler<DQuery<D>>
for DbExecutor<PgConnection>
{
type Result = Result<usize, Error>;
fn handle(&mut self, msg: DQuery<D>, _: &mut Self::Context) -> Self::Result {
let dbg = diesel::debug_query(&msg.query);
debug!("{:?}", dbg);
let pool = &self.pool;
if let Ok(conn) = pool.get() {
let res = msg.query.execute(&conn);
return res;
}
Err(Error::NotFound)
}
}