reis 0.2.0

Pure Rust implementation of libei/libeis protocol.
Documentation 
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

// TODO: Handle writable fd too?

use futures::stream::{Stream, StreamExt};
use std::{
    collections::HashMap,
    io,
    pin::Pin,
    task::{Context, Poll},
};
use tokio::io::unix::AsyncFd;

pub use crate::handshake::{HandshakeError, HandshakeResp};
use crate::{ei, handshake::EiHandshaker, ParseError, PendingRequestResult};

// XXX make this ei::EventStream?
pub struct EiEventStream(AsyncFd<ei::Context>);

impl EiEventStream {
    pub fn new(context: ei::Context) -> io::Result<Self> {
        AsyncFd::with_interest(context, tokio::io::Interest::READABLE).map(Self)
    }
}

fn poll_pending_event(
    context: &mut ei::Context,
) -> Option<Poll<Option<io::Result<PendingRequestResult<ei::Event>>>>> {
    Some(Poll::Ready(Some(Ok(context.pending_event()?))))
}

impl Stream for EiEventStream {
    type Item = io::Result<PendingRequestResult<ei::Event>>; // XXX

    fn poll_next(
        mut self: Pin<&mut Self>,
        context: &mut Context<'_>,
    ) -> Poll<Option<<Self as Stream>::Item>> {
        // If we already have a pending event, return that
        if let Some(res) = poll_pending_event(self.0.get_mut()) {
            return res;
        }
        if let Poll::Ready(guard) = Pin::new(&self.0).poll_read_ready(context) {
            let mut guard = match guard {
                Ok(guard) => guard,
                Err(err) => {
                    return Poll::Ready(Some(Err(err)));
                }
            };
            match guard.get_inner().read() {
                Err(err) if err.kind() == io::ErrorKind::UnexpectedEof => Poll::Ready(None),
                Err(err) => Poll::Ready(Some(Err(err))),
                Ok(_) => {
                    // `Backend::read()` reads until `WouldBlock`, EOF, or error
                    guard.clear_ready();
                    poll_pending_event(self.0.get_mut()).unwrap_or(Poll::Pending)
                }
            }
        } else {
            Poll::Pending
        }
    }
}

#[derive(Debug)]
pub enum EiConvertEventStreamError {
    Io(io::Error),
    Parse(ParseError),
    // TODO better error type here?
    Event(crate::event::Error),
}

// TODO rename EiProtoEventStream
pub struct EiConvertEventStream {
    inner: EiEventStream,
    converter: crate::event::EiEventConverter,
}

impl EiConvertEventStream {
    pub fn new(inner: EiEventStream, serial: u32) -> Self {
        Self {
            inner,
            converter: crate::event::EiEventConverter::new(serial),
        }
    }
}

impl Stream for EiConvertEventStream {
    type Item = Result<crate::event::EiEvent, EiConvertEventStreamError>;

    fn poll_next(
        mut self: Pin<&mut Self>,
        context: &mut Context<'_>,
    ) -> Poll<Option<<Self as Stream>::Item>> {
        if let Some(event) = self.converter.next_event() {
            return Poll::Ready(Some(Ok(event)));
        }
        while let Poll::Ready(res) = Pin::new(&mut self.inner).poll_next(context) {
            match res {
                Some(Ok(res)) => match res {
                    PendingRequestResult::Request(event) => {
                        if let Err(err) = self.converter.handle_event(event) {
                            return Poll::Ready(Some(Err(EiConvertEventStreamError::Event(err))));
                        }
                        if let Some(event) = self.converter.next_event() {
                            return Poll::Ready(Some(Ok(event)));
                        }
                    }
                    PendingRequestResult::ParseError(err) => {
                        return Poll::Ready(Some(Err(EiConvertEventStreamError::Parse(err))));
                    }
                    // TODO log?
                    PendingRequestResult::InvalidObject(_object_id) => {}
                },
                Some(Err(err)) => {
                    return Poll::Ready(Some(Err(EiConvertEventStreamError::Io(err))));
                }
                None => {
                    return Poll::Ready(None);
                }
            }
        }
        Poll::Pending
    }
}

pub async fn ei_handshake(
    events: &mut EiEventStream,
    name: &str,
    context_type: ei::handshake::ContextType,
    interfaces: &HashMap<&str, u32>,
) -> Result<HandshakeResp, HandshakeError> {
    let mut handshaker = EiHandshaker::new(name, context_type, interfaces);
    while let Some(result) = events.next().await {
        let request = crate::handshake::request_result(result?)?;
        if let Some(resp) = handshaker.handle_event(request)? {
            return Ok(resp);
        }
    }
    Err(io::Error::new(
        io::ErrorKind::UnexpectedEof,
        "unexpected EOF reading ei socket",
    )
    .into())
}