# error.rs - source
Source of the Rust file `actix-settings/src/error.rs`.
Keywords: rust, rustlang, rust-lang

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    use std::{env::VarError, io, num::ParseIntError, path::PathBuf, str::ParseBoolError};

    use toml::de::Error as TomlError;

    /// Convenience type alias for `Result<T, AtError>`.
    pub type AtResult<T> = std::result::Result<T, AtError>;

    /// Errors that can be returned from methods in this crate.
    #[derive(Debug, Clone)]
    pub enum AtError {
        /// Environment variable does not exists or is invalid.
        EnvVarError(VarError),

        /// File already exists on disk.
        FileExists(PathBuf),

        /// Invalid value.
        #[allow(missing_docs)]
        InvalidValue {
            expected: &'static str,
            got: String,
            file: &'static str,
            line: u32,
            column: u32,
        },

        /// I/O error.
        IoError(ioe::IoError),

        /// Value is not a boolean.
        ParseBoolError(ParseBoolError),

        /// Value is not an integer.
        ParseIntError(ParseIntError),

        /// Value is not an address.
        ParseAddressError(String),

        /// Error deserializing as TOML.
        TomlError(TomlError),
    }

    macro_rules! InvalidValue {
        (expected: $expected:expr, got: $got:expr,) => {
            crate::AtError::InvalidValue {
                expected: $expected,
                got: $got.to_string(),
                file: file!(),
                line: line!(),
                column: column!(),
            }
        };
    }

    impl From<io::Error> for AtError {
        fn from(err: io::Error) -> Self {
            Self::IoError(ioe::IoError::from(err))
        }
    }

    impl From<ioe::IoError> for AtError {
        fn from(err: ioe::IoError) -> Self {
            Self::IoError(err)
        }
    }

    impl From<ParseBoolError> for AtError {
        fn from(err: ParseBoolError) -> Self {
            Self::ParseBoolError(err)
        }
    }

    impl From<ParseIntError> for AtError {
        fn from(err: ParseIntError) -> Self {
            Self::ParseIntError(err)
        }
    }

    impl From<TomlError> for AtError {
        fn from(err: TomlError) -> Self {
            Self::TomlError(err)
        }
    }

    impl From<VarError> for AtError {
        fn from(err: VarError) -> Self {
            Self::EnvVarError(err)
        }
    }

    impl From<AtError> for io::Error {
        fn from(err: AtError) -> Self {
            match err {
                AtError::EnvVarError(var_error) => {
                    let msg = format!("Env var error: {}", var_error);
                    io::Error::new(io::ErrorKind::InvalidInput, msg)
                }

                AtError::FileExists(path_buf) => {
                    let msg = format!("File exists: {}", path_buf.display());
                    io::Error::new(io::ErrorKind::AlreadyExists, msg)
                }

                AtError::InvalidValue {
                    expected,
                    ref got,
                    file,
                    line,
                    column,
                } => {
                    let msg = format!(
                        "Expected {}, got {}  (@ {}:{}:{})",
                        expected, got, file, line, column
                    );
                    io::Error::new(io::ErrorKind::InvalidInput, msg)
                }

                AtError::IoError(io_error) => io_error.into(),

                AtError::ParseBoolError(parse_bool_error) => {
                    let msg = format!("Failed to parse boolean: {}", parse_bool_error);
                    io::Error::new(io::ErrorKind::InvalidInput, msg)
                }

                AtError::ParseIntError(parse_int_error) => {
                    let msg = format!("Failed to parse integer: {}", parse_int_error);
                    io::Error::new(io::ErrorKind::InvalidInput, msg)
                }

                AtError::ParseAddressError(string) => {
                    let msg = format!("Failed to parse address: {}", string);
                    io::Error::new(io::ErrorKind::InvalidInput, msg)
                }

                AtError::TomlError(toml_error) => {
                    let msg = format!("TOML error: {}", toml_error);
                    io::Error::new(io::ErrorKind::InvalidInput, msg)
                }
            }
        }
    }