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88204f91df
This will allow us to do actual error handling intra-crate in a more rusty manner, e.g. propogating errors in match statements, conversion between error types, logging messages, etc. * FIXES part of #24031: https://bugs.torproject.org/24031.
44 lines
1.7 KiB
Rust
44 lines
1.7 KiB
Rust
// Copyright (c) 2018, The Tor Project, Inc.
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// Copyright (c) 2018, isis agora lovecruft
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// See LICENSE for licensing information
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//! Various errors which may occur during protocol version parsing.
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use std::fmt;
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use std::fmt::Display;
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/// All errors which may occur during protover parsing routines.
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#[derive(Clone, Copy, Debug, Eq, PartialEq, Hash)]
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#[allow(missing_docs)] // See Display impl for error descriptions
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pub enum ProtoverError {
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Overlap,
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LowGreaterThanHigh,
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Unparseable,
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ExceedsMax,
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ExceedsExpansionLimit,
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UnknownProtocol,
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ExceedsNameLimit,
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}
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/// Descriptive error messages for `ProtoverError` variants.
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impl Display for ProtoverError {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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match *self {
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ProtoverError::Overlap
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=> write!(f, "Two or more (low, high) protover ranges would overlap once expanded."),
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ProtoverError::LowGreaterThanHigh
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=> write!(f, "The low in a (low, high) protover range was greater than high."),
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ProtoverError::Unparseable
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=> write!(f, "The protover string was unparseable."),
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ProtoverError::ExceedsMax
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=> write!(f, "The high in a (low, high) protover range exceeds u32::MAX."),
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ProtoverError::ExceedsExpansionLimit
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=> write!(f, "The protover string would exceed the maximum expansion limit."),
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ProtoverError::UnknownProtocol
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=> write!(f, "A protocol in the protover string we attempted to parse is unknown."),
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ProtoverError::ExceedsNameLimit
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=> write!(f, "An unrecognised protocol name was too long."),
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}
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}
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}
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