flowcore 1.0.0

#![allow(missing_docs)]
#![allow(unexpected_cfgs)]

use std::fmt;

pub use error_chain::bail;
use error_chain::error_chain;
use serde::de::{self, Visitor};
use serde::{Deserialize, Deserializer, Serialize, Serializer};

error_chain! {
    types {
        Error,
        ErrorKind,
        ResultExt,
        Result;
    }

    foreign_links {
        Url(url::ParseError);
        Io(std::io::Error);
        Serde(serde_json::error::Error);
        Conversion(std::num::TryFromIntError);
    }
}

/// In order to send Jobs, containing Results and hence Errors, back and fore between the Client
/// and the Server it must implement Serialize and Deserialize - but we can't derive it as
/// the structs are declared from the `error_chain` macro. So we have to implement them.
impl Serialize for Error {
    fn serialize<S>(&self, serializer: S) -> std::result::Result<S::Ok, S::Error>
    where
        S: Serializer,
    {
        serializer.serialize_str(&self.to_string())
    }
}

struct ErrorVisitor;

impl Visitor<'_> for ErrorVisitor {
    type Value = Error;

    fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
        formatter.write_str("an Error string")
    }

    fn visit_str<E>(self, value: &str) -> std::result::Result<Self::Value, E>
    where
        E: de::Error,
    {
        Ok(crate::errors::Error::from(value))
    }
}

impl<'de> Deserialize<'de> for Error {
    fn deserialize<D>(deserializer: D) -> std::result::Result<Error, D::Error>
    where
        D: Deserializer<'de>,
    {
        deserializer.deserialize_str(ErrorVisitor)
    }
}

/// We want to clone Job, which contains Result which contains Error, but can't just derive it as
/// it is generated by the `error_chain` macro, so we implement it manually
impl Clone for Error {
    fn clone(&self) -> Self {
        crate::errors::Error::from(self.to_string())
    }
}