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use std::error::Error as StdError;
use std::io;
use std::str::Utf8Error;
use std::{error, fmt};
use serde;
/// The result of a serialization or deserialization operation.
pub type Result<T> = ::std::result::Result<T, Error>;
/// An error that can be produced during (de)serializing.
pub type Error = Box<ErrorKind>;
/// The kind of error that can be produced during a serialization or deserialization.
#[derive(Debug)]
pub enum ErrorKind {
/// If the error stems from the reader/writer that is being used
/// during (de)serialization, that error will be stored and returned here.
Io(io::Error),
/// Returned if the deserializer attempts to deserialize a string that is not valid utf8
InvalidUtf8Encoding(Utf8Error),
/// Returned if the deserializer attempts to deserialize a bool that was
/// not encoded as either a 1 or a 0
InvalidBoolEncoding(u8),
/// Returned if the deserializer attempts to deserialize a char that is not in the correct format.
InvalidCharEncoding,
/// Returned if the deserializer attempts to deserialize the tag of an enum that is
/// not in the expected ranges
InvalidTagEncoding(usize),
/// Serde has a deserialize_any method that lets the format hint to the
/// object which route to take in deserializing.
DeserializeAnyNotSupported,
/// If (de)serializing a message takes more than the provided size limit, this
/// error is returned.
SizeLimit,
/// Bincode can not encode sequences of unknown length (like iterators).
SequenceMustHaveLength,
/// A custom error message from Serde.
Custom(String),
}
impl StdError for ErrorKind {
fn description(&self) -> &str {
match *self {
ErrorKind::Io(ref err) => error::Error::description(err),
ErrorKind::InvalidUtf8Encoding(_) => "string is not valid utf8",
ErrorKind::InvalidBoolEncoding(_) => "invalid u8 while decoding bool",
ErrorKind::InvalidCharEncoding => "char is not valid",
ErrorKind::InvalidTagEncoding(_) => "tag for enum is not valid",
ErrorKind::SequenceMustHaveLength => {
"Bincode can only encode sequences and maps that have a knowable size ahead of time"
}
ErrorKind::DeserializeAnyNotSupported => {
"Bincode doesn't support serde::Deserializer::deserialize_any"
}
ErrorKind::SizeLimit => "the size limit has been reached",
ErrorKind::Custom(ref msg) => msg,
}
}
fn cause(&self) -> Option<&error::Error> {
match *self {
ErrorKind::Io(ref err) => Some(err),
ErrorKind::InvalidUtf8Encoding(_) => None,
ErrorKind::InvalidBoolEncoding(_) => None,
ErrorKind::InvalidCharEncoding => None,
ErrorKind::InvalidTagEncoding(_) => None,
ErrorKind::SequenceMustHaveLength => None,
ErrorKind::DeserializeAnyNotSupported => None,
ErrorKind::SizeLimit => None,
ErrorKind::Custom(_) => None,
}
}
}
impl From<io::Error> for Error {
fn from(err: io::Error) -> Error {
ErrorKind::Io(err).into()
}
}
impl fmt::Display for ErrorKind {
fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
match *self {
ErrorKind::Io(ref ioerr) => write!(fmt, "io error: {}", ioerr),
ErrorKind::InvalidUtf8Encoding(ref e) => write!(fmt, "{}: {}", self.description(), e),
ErrorKind::InvalidBoolEncoding(b) => {
write!(fmt, "{}, expected 0 or 1, found {}", self.description(), b)
}
ErrorKind::InvalidCharEncoding => write!(fmt, "{}", self.description()),
ErrorKind::InvalidTagEncoding(tag) => {
write!(fmt, "{}, found {}", self.description(), tag)
}
ErrorKind::SequenceMustHaveLength => write!(fmt, "{}", self.description()),
ErrorKind::SizeLimit => write!(fmt, "{}", self.description()),
ErrorKind::DeserializeAnyNotSupported => write!(
fmt,
"Bincode does not support the serde::Deserializer::deserialize_any method"
),
ErrorKind::Custom(ref s) => s.fmt(fmt),
}
}
}
impl serde::de::Error for Error {
fn custom<T: fmt::Display>(desc: T) -> Error {
ErrorKind::Custom(desc.to_string()).into()
}
}
impl serde::ser::Error for Error {
fn custom<T: fmt::Display>(msg: T) -> Self {
ErrorKind::Custom(msg.to_string()).into()
}
}
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