libp2p_core/upgrade/
error.rs

1// Copyright 2018 Parity Technologies (UK) Ltd.
2//
3// Permission is hereby granted, free of charge, to any person obtaining a
4// copy of this software and associated documentation files (the "Software"),
5// to deal in the Software without restriction, including without limitation
6// the rights to use, copy, modify, merge, publish, distribute, sublicense,
7// and/or sell copies of the Software, and to permit persons to whom the
8// Software is furnished to do so, subject to the following conditions:
9//
10// The above copyright notice and this permission notice shall be included in
11// all copies or substantial portions of the Software.
12//
13// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
14// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
15// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
16// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
17// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
18// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
19// DEALINGS IN THE SOFTWARE.
20
21use multistream_select::NegotiationError;
22use std::fmt;
23
24/// Error that can happen when upgrading a connection or substream to use a protocol.
25#[derive(Debug)]
26pub enum UpgradeError<E> {
27    /// Error during the negotiation process.
28    Select(NegotiationError),
29    /// Error during the post-negotiation handshake.
30    Apply(E),
31}
32
33impl<E> UpgradeError<E> {
34    pub fn map_err<F, T>(self, f: F) -> UpgradeError<T>
35    where
36        F: FnOnce(E) -> T
37    {
38        match self {
39            UpgradeError::Select(e) => UpgradeError::Select(e),
40            UpgradeError::Apply(e) => UpgradeError::Apply(f(e)),
41        }
42    }
43
44    pub fn into_err<T>(self) -> UpgradeError<T>
45    where
46        T: From<E>
47    {
48        self.map_err(Into::into)
49    }
50}
51
52impl<E> fmt::Display for UpgradeError<E>
53where
54    E: fmt::Display
55{
56    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
57        match self {
58            UpgradeError::Select(e) => write!(f, "select error: {}", e),
59            UpgradeError::Apply(e) => write!(f, "upgrade apply error: {}", e),
60        }
61    }
62}
63
64impl<E> std::error::Error for UpgradeError<E>
65where
66    E: std::error::Error + 'static
67{
68    fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
69        match self {
70            UpgradeError::Select(e) => Some(e),
71            UpgradeError::Apply(e) => Some(e),
72        }
73    }
74}
75
76impl<E> From<NegotiationError> for UpgradeError<E> {
77    fn from(e: NegotiationError) -> Self {
78        UpgradeError::Select(e)
79    }
80}
81
libp2p_core/upgrade/error.rs

libp2p_core/upgrade/
error.rs
