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use std::error::Error as StdError;
use std::fmt::{self, Debug, Display};
use std::io;
pub type Result<T, E = Error> = std::result::Result<T, E>;
#[derive(Debug)]
#[non_exhaustive]
pub enum Error {
Io(io::Error),
UrlParse(url::ParseError),
Database(Box<dyn DatabaseError + Send + Sync>),
RowNotFound,
ColumnNotFound(Box<str>),
ColumnIndexOutOfBounds { index: usize, len: usize },
Protocol(Box<str>),
PoolTimedOut(Option<Box<dyn StdError + Send + Sync>>),
PoolClosed,
Tls(Box<dyn StdError + Send + Sync>),
Decode(Box<dyn StdError + Send + Sync>),
}
impl Error {
#[allow(dead_code)]
pub(crate) fn decode<E>(err: E) -> Self
where
E: StdError + Send + Sync + 'static,
{
Error::Decode(err.into())
}
}
impl StdError for Error {
fn source(&self) -> Option<&(dyn StdError + 'static)> {
match self {
Error::Io(error) => Some(error),
Error::UrlParse(error) => Some(error),
Error::PoolTimedOut(Some(error)) => Some(&**error),
Error::Decode(error) => Some(&**error),
Error::Tls(error) => Some(&**error),
_ => None,
}
}
}
impl Display for Error {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
match self {
Error::Io(error) => write!(f, "{}", error),
Error::UrlParse(error) => write!(f, "{}", error),
Error::Decode(error) => write!(f, "{}", error),
Error::Database(error) => Display::fmt(error, f),
Error::RowNotFound => f.write_str("found no row when we expected at least one"),
Error::ColumnNotFound(ref name) => {
write!(f, "no column found with the name {:?}", name)
}
Error::ColumnIndexOutOfBounds { index, len } => write!(
f,
"column index out of bounds: there are {} columns but the index is {}",
len, index
),
Error::Protocol(ref err) => f.write_str(err),
Error::PoolTimedOut(Some(ref err)) => {
write!(f, "timed out while waiting for an open connection: {}", err)
}
Error::PoolTimedOut(None) => {
write!(f, "timed out while waiting for an open connection")
}
Error::PoolClosed => f.write_str("attempted to acquire a connection on a closed pool"),
Error::Tls(ref err) => write!(f, "error during TLS upgrade: {}", err),
}
}
}
impl From<io::Error> for Error {
#[inline]
fn from(err: io::Error) -> Self {
Error::Io(err)
}
}
impl From<io::ErrorKind> for Error {
#[inline]
fn from(err: io::ErrorKind) -> Self {
Error::Io(err.into())
}
}
impl From<url::ParseError> for Error {
#[inline]
fn from(err: url::ParseError) -> Self {
Error::UrlParse(err)
}
}
impl From<ProtocolError<'_>> for Error {
#[inline]
fn from(err: ProtocolError) -> Self {
Error::Protocol(err.args.to_string().into_boxed_str())
}
}
#[cfg(feature = "tls")]
#[cfg_attr(docsrs, doc(cfg(feature = "tls")))]
impl From<async_native_tls::Error> for Error {
#[inline]
fn from(err: async_native_tls::Error) -> Self {
Error::Tls(err.into())
}
}
impl From<TlsError<'_>> for Error {
#[inline]
fn from(err: TlsError<'_>) -> Self {
Error::Tls(err.args.to_string().into())
}
}
impl<T> From<T> for Error
where
T: 'static + DatabaseError,
{
#[inline]
fn from(err: T) -> Self {
Error::Database(Box::new(err))
}
}
pub trait DatabaseError: Display + Debug + Send + Sync {
fn message(&self) -> &str;
fn code(&self) -> Option<&str> {
None
}
fn details(&self) -> Option<&str> {
None
}
fn hint(&self) -> Option<&str> {
None
}
fn table_name(&self) -> Option<&str> {
None
}
fn column_name(&self) -> Option<&str> {
None
}
fn constraint_name(&self) -> Option<&str> {
None
}
}
pub(crate) struct ProtocolError<'a> {
pub args: fmt::Arguments<'a>,
}
#[allow(unused_macros)]
macro_rules! protocol_err (
($($args:tt)*) => {
$crate::error::ProtocolError { args: format_args!($($args)*) }
}
);
pub(crate) struct TlsError<'a> {
pub args: fmt::Arguments<'a>,
}
#[allow(unused_macros)]
macro_rules! tls_err {
($($args:tt)*) => { crate::error::TlsError { args: format_args!($($args)*)} };
}
#[allow(unused_macros)]
macro_rules! impl_fmt_error {
($err:ty) => {
impl std::fmt::Display for $err {
fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
f.pad(self.message())
}
}
};
}
#[derive(Debug, Clone, Copy)]
pub struct UnexpectedNullError;
impl Display for UnexpectedNullError {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.write_str("unexpected null; try decoding as an `Option`")
}
}
impl StdError for UnexpectedNullError {}