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
134
135
136
137
138
139
140
141
142
143
144
145
146
147

use codec::{SendError, UserError};
use proto;

use std::{error, fmt, io};

pub use frame::Reason;

/// Represents HTTP/2.0 operation errors.
///
/// `Error` covers error cases raised by protocol errors caused by the
/// peer, I/O (transport) errors, and errors caused by the user of the library.
///
/// If the error was caused by the remote peer, then it will contain a
/// [`Reason`] which can be obtained with the [`reason`] function.
///
/// [`Reason`]: struct.Reason.html
/// [`reason`]: #method.reason
#[derive(Debug)]
pub struct Error {
    kind: Kind,
}

#[derive(Debug)]
enum Kind {
    /// An error caused by an action taken by the remote peer.
    ///
    /// This is either an error received by the peer or caused by an invalid
    /// action taken by the peer (i.e. a protocol error).
    Proto(Reason),

    /// An error resulting from an invalid action taken by the user of this
    /// library.
    User(UserError),

    /// An `io::Error` occurred while trying to read or write.
    Io(io::Error),
}

// ===== impl Error =====

impl Error {
    /// If the error was caused by the remote peer, the error reason.
    ///
    /// This is either an error received by the peer or caused by an invalid
    /// action taken by the peer (i.e. a protocol error).
    pub fn reason(&self) -> Option<Reason> {
        match self.kind {
            Kind::Proto(reason) => Some(reason),
            _ => None,
        }
    }

    /// Returns the true if the error is an io::Error
    pub fn is_io(&self) -> bool {
        match self.kind {
            Kind::Io(_) => true,
            _ => false,
        }
    }

    /// Returns the error if the error is an io::Error
    pub fn get_io(&self) -> Option<&io::Error> {
        match self.kind {
            Kind::Io(ref e) => Some(e),
            _ => None,
        }
    }

    /// Returns the error if the error is an io::Error
    pub fn into_io(self) -> Option<io::Error> {
        match self.kind {
            Kind::Io(e) => Some(e),
            _ => None,
        }
    }
}

impl From<proto::Error> for Error {
    fn from(src: proto::Error) -> Error {
        use proto::Error::*;

        Error {
            kind: match src {
                Proto(reason) => Kind::Proto(reason),
                Io(e) => Kind::Io(e),
            },
        }
    }
}

impl From<io::Error> for Error {
    fn from(src: io::Error) -> Error {
        Error {
            kind: Kind::Io(src),
        }
    }
}

impl From<Reason> for Error {
    fn from(src: Reason) -> Error {
        Error {
            kind: Kind::Proto(src),
        }
    }
}

impl From<SendError> for Error {
    fn from(src: SendError) -> Error {
        match src {
            SendError::User(e) => e.into(),
            SendError::Connection(reason) => reason.into(),
            SendError::Io(e) => e.into(),
        }
    }
}

impl From<UserError> for Error {
    fn from(src: UserError) -> Error {
        Error {
            kind: Kind::User(src),
        }
    }
}

impl fmt::Display for Error {
    fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
        use self::Kind::*;

        match self.kind {
            Proto(ref reason) => write!(fmt, "protocol error: {}", reason),
            User(ref e) => write!(fmt, "user error: {}", e),
            Io(ref e) => fmt::Display::fmt(e, fmt),
        }
    }
}

impl error::Error for Error {
    fn description(&self) -> &str {
        use self::Kind::*;

        match self.kind {
            Io(ref e) => error::Error::description(e),
            Proto(ref reason) => reason.description(),
            User(ref user) => user.description(),
        }
    }
}