swindon 0.3.2

An HTTP edge (frontend) server with smart websockets support 
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

use std::io;
use std::str::Utf8Error;
use futures::sync::mpsc::SendError;

use rustc_serialize::{Encodable, Encoder};
use rustc_serialize::json::{Json, ParserError};
use tk_http::Status;
use tk_http::client;

use super::message::{Meta, ValidationError};

quick_error! {
    #[derive(Debug)]
    pub enum MessageError {
        /// Http client request error;
        IoError(err: io::Error) {
            description(err.description())
            display("I/O error: {:?}", err)
            from()
        }
        /// Utf8 decoding error;
        Utf8Error(err: Utf8Error) {
            description(err.description())
            display("Decode error {}", err)
            from()
        }
        /// JSON Parser Error;
        JsonError(err: ParserError) {
            description(err.description())
            display("JSON error: {}", err)
            from()
        }
        /// Protocol Message validation error;
        ValidationError(err: ValidationError) {
            description("Message validation error")
            display("Validation error: {:?}", err)
            from()
        }
        /// Backend application Error;
        HttpError(status: Status, body: Option<Json>) {
            // from()
            description("Http error")
            display("Http error: {}: {:?}", status.code(), body)
        }
        /// Coundn't send request by HTTP, got network or protocol error
        Proto(err: client::Error) {
            from()
            description("Http error")
            display("Http error: {}", err)
        }
        /// Too many requests queued
        PoolOverflow {
            description("too many requests queued")
        }
        /// Error sending message to worker pool
        PoolError {
            description("error sending message to worker pool")
        }
    }
}

impl<T> From<SendError<T>> for MessageError {
    fn from(_: SendError<T>) -> MessageError {
        MessageError::PoolError
    }
}

impl Encodable for MessageError {
    fn encode<S: Encoder>(&self, s: &mut S) -> Result<(), S::Error> {
        use self::MessageError::*;
        match *self {
            HttpError(_, None) => {
                s.emit_nil()
            }
            HttpError(_, Some(ref j)) => {
                j.encode(s)
            }
            Utf8Error(ref err) => {
                s.emit_str(format!("{}", err).as_str())
            }
            JsonError(ref err) => {
                s.emit_str(format!("{}", err).as_str())
            }
            ValidationError(ref err) => {
                s.emit_str(format!("{:?}", err).as_str())
            }
            IoError(ref err) => {
                s.emit_str(format!("{:?}", err).as_str())
            }
            Proto(_) => {
                s.emit_str("backend_protocol_error")
            }
            PoolOverflow => {
                s.emit_str("too_many_requests")
            }
            PoolError => {
                s.emit_str("unexpected_pool_error")
            }
        }
    }
}

impl MessageError {
    pub fn update_meta(&self, meta: &mut Meta) {
        use self::MessageError::*;
        let kind = match *self {
            HttpError(s, _) => {
                meta.insert("http_error".to_string(),
                    Json::U64(s.code() as u64));
                "http_error"
            }
            IoError(_) | Utf8Error(_) | JsonError(_) => "invalid_content",
            Proto(_) | ValidationError(_) => "protocol_error",
            PoolError => "unexpected_error",
            PoolOverflow => "too_many_requests",
        };
        meta.insert("error_kind".to_string(), Json::String(kind.to_string()));
    }
}