redis_rocksdb 0.3.9

rust implement structure kv(key/value) embedded database, storage by rocksdb
Documentation 
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use std::array::TryFromSliceError;
use std::fmt::{Display, Formatter};

use crate::RrError::Other;

#[derive(Debug)]
pub enum RrError {
	Message(String),
	Other(anyhow::Error),
}

impl RrError {
	pub(crate) fn message(message: String) -> RrError {
		RrError::Message(message)
	}
	pub(crate) fn not_find(name: &str) -> RrError {
		RrError::Message(name.to_owned())
	}
	pub(crate) fn none_error(name: &str) -> RrError {
		RrError::Message(name.to_owned())
	}
	pub(crate) fn data_error(name: &str) -> RrError {
		RrError::Message(name.to_owned())
	}
}

impl Display for RrError {
	fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
		// write!(f,"{}", self.0)
		match &self {
			RrError::Message(s) => {
				write!(f, "RrError: {}", s)
			},
			RrError::Other(e) => {
				write!(f, "{}", e)
			},
		}
	}
}

impl std::error::Error for RrError {
	fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
		if let RrError::Other(e) = self {
			e.source()
		} else {
			None
		}
	}
}

impl From<anyhow::Error> for RrError {
	fn from(r: anyhow::Error) -> Self {
		Other(r)
	}
}

// impl<T> From<T> for RrError where
//     T: std::error::Error
// {
//     fn from(r: T) -> Self {
//         Other(r)
//     }
// }

impl From<rocksdb::Error> for RrError {
	fn from(e: rocksdb::Error) -> Self {
		RrError::Other(anyhow::Error::from(e))
	}
}

impl From<TryFromSliceError> for RrError {
	fn from(e: TryFromSliceError) -> Self {
		RrError::Other(anyhow::Error::from(e))
	}
}