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use std::{
error::Error as StdError,
result::Result as StdResult,
fmt::{Display, Formatter, Result as FmtResult},
};
use url::{Url, ParseError as UrlError};
pub type Result<T> = StdResult<T, Error>;
#[derive(Debug, Clone)]
pub enum Error {
AlreadyRegistered(String),
InvalidUrl(UrlError),
UnsupportedUrl(Url),
FailedResolve(String),
FailedConnect(String),
}
impl StdError for Error {}
impl Display for Error {
fn fmt(&self, f: &mut Formatter) -> FmtResult {
pub use Error::*;
match self {
AlreadyRegistered(name) => { "Backend already registered: ".fmt(f)?; name.fmt(f) },
InvalidUrl(error) => { "Unable to parse URL: ".fmt(f)?; error.fmt(f) },
UnsupportedUrl(url) => { "Unable to handle specified URL: ".fmt(f)?; url.fmt(f) },
FailedResolve(error) => { "Unable to resolve name: ".fmt(f)?; error.fmt(f) },
FailedConnect(error) => { "Unable to connect: ".fmt(f)?; error.fmt(f) },
}
}
}
impl From<Url> for Error {
fn from(url: Url) -> Self {
Self::UnsupportedUrl(url)
}
}
impl From<UrlError> for Error {
fn from(error: UrlError) -> Self {
Self::InvalidUrl(error)
}
}
impl From<String> for Error {
fn from(error: String) -> Self {
Self::FailedConnect(error)
}
}