1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133

// Copyright 2018 Parity Technologies (UK) Ltd.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the "Software"),
// to deal in the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense,
// and/or sell copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.

use crate::connection::ConnectionLimit;
use crate::transport::TransportError;
use crate::Multiaddr;
use std::{fmt, io};

/// Errors that can occur in the context of an established `Connection`.
#[derive(Debug)]
pub enum ConnectionError<THandlerErr> {
    /// An I/O error occurred on the connection.
    // TODO: Eventually this should also be a custom error?
    IO(io::Error),

    /// The connection handler produced an error.
    Handler(THandlerErr),
}

impl<THandlerErr> fmt::Display for ConnectionError<THandlerErr>
where
    THandlerErr: fmt::Display,
{
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        match self {
            ConnectionError::IO(err) => write!(f, "Connection error: I/O error: {}", err),
            ConnectionError::Handler(err) => write!(f, "Connection error: Handler error: {}", err),
        }
    }
}

impl<THandlerErr> std::error::Error for ConnectionError<THandlerErr>
where
    THandlerErr: std::error::Error + 'static,
{
    fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
        match self {
            ConnectionError::IO(err) => Some(err),
            ConnectionError::Handler(err) => Some(err),
        }
    }
}

/// Errors that can occur in the context of a pending outgoing `Connection`.
///
/// Note: Addresses for an outbound connection are dialed in parallel. Thus, compared to
/// [`PendingInboundConnectionError`], one or more [`TransportError`]s can occur for a single
/// connection.
pub type PendingOutboundConnectionError<TTransErr> =
    PendingConnectionError<Vec<(Multiaddr, TransportError<TTransErr>)>>;

/// Errors that can occur in the context of a pending incoming `Connection`.
pub type PendingInboundConnectionError<TTransErr> =
    PendingConnectionError<TransportError<TTransErr>>;

/// Errors that can occur in the context of a pending `Connection`.
#[derive(Debug)]
pub enum PendingConnectionError<TTransErr> {
    /// An error occurred while negotiating the transport protocol(s) on a connection.
    Transport(TTransErr),

    /// The connection was dropped because the connection limit
    /// for a peer has been reached.
    ConnectionLimit(ConnectionLimit),

    /// Pending connection attempt has been aborted.
    Aborted,

    /// The peer identity obtained on the connection did not
    /// match the one that was expected or is otherwise invalid.
    InvalidPeerId,

    /// An I/O error occurred on the connection.
    // TODO: Eventually this should also be a custom error?
    IO(io::Error),
}

impl<TTransErr> fmt::Display for PendingConnectionError<TTransErr>
where
    TTransErr: fmt::Display + fmt::Debug,
{
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        match self {
            PendingConnectionError::IO(err) => write!(f, "Pending connection: I/O error: {}", err),
            PendingConnectionError::Aborted => write!(f, "Pending connection: Aborted."),
            PendingConnectionError::Transport(err) => {
                write!(
                    f,
                    "Pending connection: Transport error on connection: {}",
                    err
                )
            }
            PendingConnectionError::ConnectionLimit(l) => {
                write!(f, "Connection error: Connection limit: {}.", l)
            }
            PendingConnectionError::InvalidPeerId => {
                write!(f, "Pending connection: Invalid peer ID.")
            }
        }
    }
}

impl<TTransErr> std::error::Error for PendingConnectionError<TTransErr>
where
    TTransErr: std::error::Error + 'static,
{
    fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
        match self {
            PendingConnectionError::IO(err) => Some(err),
            PendingConnectionError::Transport(_) => None,
            PendingConnectionError::InvalidPeerId => None,
            PendingConnectionError::Aborted => None,
            PendingConnectionError::ConnectionLimit(..) => None,
        }
    }
}