1  //! Declare an error type for the tor-consdiff crate.
 2  
 3  use thiserror::Error;
 4  
 5  use std::num::ParseIntError;
 6  
 7  /// An error type from the tor-consdiff crate.
 8  #[derive(Clone, Debug, Error)]
 9  #[non_exhaustive]
10  pub enum Error {
11      /// We got a consensus diff that we couldn't parse, or which we found
12      /// to be somehow invalid.
13      // TODO: it would be neat to have line numbers here.
14      #[error("Invalid diff: {0}")]
15      BadDiff(&'static str),
16  
17      /// We got a consensus diff that looked valid, but we couldn't apply it
18      /// to the given input.
19      #[error("Diff didn't apply to input: {0}")]
20      CantApply(&'static str),
21  }
22  
23  impl From<ParseIntError> for Error {
24      fn from(_e: ParseIntError) -> Error {
25          Error::BadDiff("can't parse line number")
26      }
27  }
28  impl From<hex::FromHexError> for Error {
29      fn from(_e: hex::FromHexError) -> Error {
30          Error::BadDiff("invalid hexadecimal in 'hash' line")
31      }
32  }