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use std; use std::fmt::Formatter; #[derive(PartialEq, Debug, Clone, Copy)] pub enum Error { TooFewShards, TooManyShards, TooFewDataShards, TooManyDataShards, TooFewParityShards, TooManyParityShards, TooFewBufferShards, TooManyBufferShards, IncorrectShardSize, TooFewShardsPresent, EmptyShard, InvalidShardFlags, InvalidIndex, } impl Error { fn to_string(&self) -> &str { match *self { Error::TooFewShards=> "The number of provided shards is smaller than the one in codec", Error::TooManyShards => "The number of provided shards is greater than the one in codec", Error::TooFewDataShards => "The number of provided data shards is smaller than the one in codec", Error::TooManyDataShards => "The number of provided data shards is greater than the one in codec", Error::TooFewParityShards => "The number of provided parity shards is smaller than the one in codec", Error::TooManyParityShards => "The number of provided parity shards is greater than the one in codec", Error::TooFewBufferShards => "The number of provided buffer shards is smaller than the number of parity shards in codec", Error::TooManyBufferShards => "The number of provided buffer shards is greater than the number of parity shards in codec", Error::IncorrectShardSize => "At least one of the provided shards is not of the correct size", Error::TooFewShardsPresent => "The number of shards present is smaller than number of parity shards, cannot reconstruct missing shards", Error::EmptyShard => "The first shard provided is of zero length", Error::InvalidShardFlags => "The number of flags does not match the total number of shards", Error::InvalidIndex => "The data shard index provided is greater or equal to the number of data shards in codec", } } } impl std::fmt::Display for Error { fn fmt(&self, f: &mut Formatter) -> Result<(), std::fmt::Error> { write!(f, "{}", self.to_string()) } } impl std::error::Error for Error { fn description(&self) -> &str { self.to_string() } } #[derive(PartialEq, Debug, Clone, Copy)] pub enum SBSError { TooManyCalls, LeftoverShards, RSError(Error), } impl SBSError { fn to_string(&self) -> &str { match *self { SBSError::TooManyCalls => "Too many calls", SBSError::LeftoverShards => "Leftover shards", SBSError::RSError(ref e) => e.to_string(), } } } impl std::fmt::Display for SBSError { fn fmt(&self, f: &mut Formatter) -> Result<(), std::fmt::Error> { write!(f, "{}", self.to_string()) } } impl std::error::Error for SBSError { fn description(&self) -> &str { self.to_string() } } #[cfg(test)] mod tests { use crate::errors::Error; use crate::errors::SBSError; #[test] fn test_error_to_string_is_okay() { assert_eq!( Error::TooFewShards.to_string(), "The number of provided shards is smaller than the one in codec" ); assert_eq!( Error::TooManyShards.to_string(), "The number of provided shards is greater than the one in codec" ); assert_eq!( Error::TooFewDataShards.to_string(), "The number of provided data shards is smaller than the one in codec" ); assert_eq!( Error::TooManyDataShards.to_string(), "The number of provided data shards is greater than the one in codec" ); assert_eq!( Error::TooFewParityShards.to_string(), "The number of provided parity shards is smaller than the one in codec" ); assert_eq!( Error::TooManyParityShards.to_string(), "The number of provided parity shards is greater than the one in codec" ); assert_eq!( Error::TooFewBufferShards.to_string(), "The number of provided buffer shards is smaller than the number of parity shards in codec" ); assert_eq!( Error::TooManyBufferShards.to_string(), "The number of provided buffer shards is greater than the number of parity shards in codec" ); assert_eq!( Error::IncorrectShardSize.to_string(), "At least one of the provided shards is not of the correct size" ); assert_eq!(Error::TooFewShardsPresent.to_string(), "The number of shards present is smaller than number of parity shards, cannot reconstruct missing shards"); assert_eq!( Error::EmptyShard.to_string(), "The first shard provided is of zero length" ); assert_eq!( Error::InvalidShardFlags.to_string(), "The number of flags does not match the total number of shards" ); assert_eq!( Error::InvalidIndex.to_string(), "The data shard index provided is greater or equal to the number of data shards in codec" ); } #[test] fn test_sbserror_to_string_is_okay() { assert_eq!(SBSError::TooManyCalls.to_string(), "Too many calls"); assert_eq!(SBSError::LeftoverShards.to_string(), "Leftover shards"); } #[test] fn test_error_display_does_not_panic() { println!("{}", Error::TooFewShards); } #[test] fn test_sbserror_display_does_not_panic() { println!("{}", SBSError::TooManyCalls); } }