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

//! Error and Result module.

use std::fmt;
use std::result::Result as StdResult;
use failure::{Backtrace, Context, Fail};

/// `Error` type for the batch crate. Implements `Fail`.
#[derive(Debug)]
pub struct Error {
    inner: Context<ErrorKind>,
}

/// A set of errors that can occur interacting with queues & workers.
#[derive(Debug, Fail)]
pub enum ErrorKind {
    /// Couldn't serialize `Task` or `Job`.
    #[fail(display = "Couldn't serialize Task or Job: {}", _0)]
    Serialization(#[cause] ::serde_json::Error),

    /// Couldn't deserialize `Task` or `Job`.
    #[fail(display = "Couldn't deserialize Task or Job: {}", _0)]
    Deserialization(#[cause] ::serde_json::Error),

    /// Couldn't create Tokio reactor
    #[fail(display = "Couldn't create Tokio reactor: {}", _0)]
    Reactor(#[cause] ::std::io::Error),

    /// Generic I/O error
    #[fail(display = "Generic I/O error: {}", _0)]
    Io(#[cause] ::std::io::Error),

    /// Couldn't spawn child process and execute given job.
    #[fail(display = "Couldn't spawn child process and execute given job: {}", _0)]
    SubProcessManagement(#[cause] ::std::io::Error),

    /// The broker wasn't provided any queue.
    #[fail(display = "A handle to a Tokio reactor was not provided")]
    NoHandle,

    /// The given URL's scheme is not handled.
    #[fail(display = "This URL scheme is invalid: {}", _0)]
    InvalidScheme(::std::string::String),

    /// An error occured in the RabbitMQ broker.
    #[fail(display = "An error occured in the RabbitMQ broker: {}", _0)]
    Rabbitmq(#[cause] ::std::io::Error),
}

impl Error {
    /// Returns the underlying `Kind` of this error
    pub(crate) fn kind(&self) -> &ErrorKind {
        self.inner.get_context()
    }

    /// Returns true if the error is from the serialization of a `Job` or a `Task`.
    pub fn is_serialization(&self) -> bool {
        match *self.kind() {
            ErrorKind::Serialization(_) => true,
            _ => false,
        }
    }

    /// Returns true if the error is from the deserialization of a `Job` or a `Task`.
    pub fn is_deserialization(&self) -> bool {
        match *self.kind() {
            ErrorKind::Deserialization(_) => true,
            _ => false,
        }
    }

    /// Returns true if the error is from the underlying I/O event loop.
    pub fn is_reactor(&self) -> bool {
        match *self.kind() {
            ErrorKind::Reactor(_) => true,
            _ => false,
        }
    }

    /// Returns true if the error is a generic I/O one.
    pub fn is_generic_io(&self) -> bool {
        match *self.kind() {
            ErrorKind::Io(_) => true,
            _ => false,
        }
    }

    /// Returns true if the error is from the spawning or execution of a subprocess.
    pub fn is_subprocess(&self) -> bool {
        match *self.kind() {
            ErrorKind::SubProcessManagement(_) => true,
            _ => false,
        }
    }

    /// Returns true if the error is from a missing Tokio reactor handle.
    pub fn is_no_handle(&self) -> bool {
        match *self.kind() {
            ErrorKind::NoHandle => true,
            _ => false,
        }
    }

    /// Returns true if the error is from the `RabbitMQ` connection.
    pub fn is_rabbitmq(&self) -> bool {
        match *self.kind() {
            ErrorKind::Rabbitmq(_) => true,
            _ => false,
        }
    }
}

impl Fail for Error {
    fn cause(&self) -> Option<&Fail> {
        self.inner.cause()
    }

    fn backtrace(&self) -> Option<&Backtrace> {
        self.inner.backtrace()
    }
}

impl fmt::Display for Error {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        fmt::Display::fmt(&self.inner, f)
    }
}

impl From<ErrorKind> for Error {
    fn from(inner: ErrorKind) -> Error {
        Error {
            inner: Context::new(inner),
        }
    }
}

impl From<Context<ErrorKind>> for Error {
    fn from(inner: Context<ErrorKind>) -> Error {
        Error { inner: inner }
    }
}

/// Result type returned from `batch` functions that can fail.
pub type Result<T> = StdResult<T, Error>;