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use derive_more::*;
use std::borrow::Cow;
/// Result error type.
///
#[derive(Debug, Display)]
pub enum OpenProtocolError<'a> {
/// The value of a field is the empty string `""` or containing all white-spaces,
/// which is not allowed as value of that field.
#[display(fmt = "field {} cannot be empty or all whitespace", _0)]
EmptyField(&'a str),
//
/// The value of a field is not valid.
#[display(fmt = "value [{}] is invalid for the field {} - {}", value, field, description)]
InvalidField { field: &'a str, value: Cow<'a, str>, description: Cow<'a, str> },
//
/// The value of a field is not consistent with the matching value in the [`state`].
///
/// [`state`]: struct.StateValues.html
///
#[display(fmt = "value of field {} is not the same as the matching field in the state", _0)]
InconsistentState(&'a str),
//
/// The value of a field is not consistent with the matching value in the
/// [`Controller`] structure.
///
/// [`Controller`]: struct.Controller.html
#[display(
fmt = "value of field {} is not the same as the matching field in the Controller",
_0
)]
InconsistentField(&'a str),
//
/// An enforced constraint is broken.
#[display(fmt = "{}", _0)]
ConstraintViolated(Cow<'a, str>),
//
/// Error when serializing/deserializing JSON.
#[display(fmt = "[{:?}] {}", "_0.classify()", _0)]
JsonError(serde_json::Error),
//
/// An unexpected system error.
#[display(fmt = "{}", _0)]
SystemError(Cow<'a, str>),
}
impl std::error::Error for OpenProtocolError<'_> {
fn description(&self) -> &str {
match self {
// JSON error
Self::JsonError(err) => err.description(),
//
// Invalid field value
Self::InvalidField { description, .. } => {
if description.is_empty() {
"invalid field value"
} else {
description
}
}
//
// Constraint violation
Self::ConstraintViolated(err) => err,
//
// System error
Self::SystemError(err) => err,
//
// Inconsistent field
Self::InconsistentField(_) => {
"value of field is not the same as matching field in the Controller"
}
//
// Inconsistent state
Self::InconsistentState(_) => {
"value of field is not the same as matching field in the state"
}
//
// Field empty
Self::EmptyField(_) => "field cannot be empty or all whitespace",
}
}
fn cause(&self) -> Option<&dyn std::error::Error> {
match self {
Self::JsonError(err) => Some(err),
_ => None,
}
}
}
impl PartialEq for OpenProtocolError<'_> {
/// Implement `PartialEq` for `OpenProtocolError`.
///
/// Most variants already implement `PartialEq` and are simply delegated.
///
/// The only variant that doesn't automatically implement `PartialEq` is [`JsonError`]
/// which encapsulates a `serde::error::Error` object that does not implement
/// `PartialEq`. In this case, we test for equality simply by comparing the `Debug`
/// output of `self` and `other`.
///
/// [`JsonError`]: #variant.JsonError
///
fn eq(&self, other: &Self) -> bool {
match (self, other) {
// JSON error - since serde::error::Error does not implement PartialEq,
// the only thing we can do is compare the debug representation.
(Self::JsonError(err1), Self::JsonError(err2)) => {
format!("{:?}", err1) == format!("{:?}", err2)
}
//
// All other variants need to manually implement PartialEq
(Self::EmptyField(err1), Self::EmptyField(err2)) => err1 == err2,
(
Self::InvalidField { field: field1, value: value1, description: err1 },
Self::InvalidField { field: field2, value: value2, description: err2 },
) => field1 == field2 && value1 == value2 && err1 == err2,
(Self::InconsistentState(err1), Self::InconsistentState(err2)) => err1 == err2,
(Self::InconsistentField(err1), Self::InconsistentField(err2)) => err1 == err2,
(Self::ConstraintViolated(err1), Self::ConstraintViolated(err2)) => err1 == err2,
_ => false,
}
}
}
impl Eq for OpenProtocolError<'_> {}
impl std::convert::From<OpenProtocolError<'_>> for String {
fn from(error: OpenProtocolError<'_>) -> Self {
error.to_string()
}
}