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use std::error::Error as StdError;
use std::fmt;
use std::time::Instant;
use futures::{
future::{self, Future},
Poll,
};
use crate::{Ping, Poolable};
pub trait ConnectionFactory {
type Connection: Poolable;
fn create_connection(&self) -> NewConnection<Self::Connection>;
fn connecting_to(&self) -> &str;
fn ping(&self, _timeout: Instant) -> Box<dyn Future<Item = Ping, Error = ()> + Send> {
Box::new(future::err(()))
}
}
#[derive(Debug)]
pub struct NewConnectionError {
cause: Box<dyn StdError + Send + 'static>,
}
impl NewConnectionError {
pub fn new<E>(cause: E) -> Self
where
E: StdError + Send + 'static,
{
Self {
cause: Box::new(cause),
}
}
}
impl fmt::Display for NewConnectionError {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "could not create a new connection: {}", self.cause)
}
}
impl StdError for NewConnectionError {
fn description(&self) -> &str {
"could not create a new connection"
}
fn cause(&self) -> Option<&dyn StdError> {
Some(&*self.cause)
}
}
pub struct NewConnection<T: Poolable> {
inner: Box<dyn Future<Item = T, Error = NewConnectionError> + Send + 'static>,
}
impl<T: Poolable> NewConnection<T> {
pub fn new<F>(f: F) -> Self
where
F: Future<Item = T, Error = NewConnectionError> + Send + 'static,
{
Self { inner: Box::new(f) }
}
}
impl<T: Poolable> Future for NewConnection<T> {
type Item = T;
type Error = NewConnectionError;
fn poll(&mut self) -> Poll<Self::Item, Self::Error> {
self.inner.poll()
}
}