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
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170

#[macro_use]
extern crate serde_derive;
#[macro_use]
extern crate log;

pub mod find_service;
mod framing;
pub mod publisher;
pub mod subscriber;

use find_service::proto;
use std::fmt;
use std::io;
use std::net::{SocketAddr, ToSocketAddrs};
use std::time;
use tokio::{net::UdpSocket, sync::oneshot::error::RecvError as OneshotRecvError, time as timer};

#[derive(Debug)]
pub enum Error {
    Empty,
    AddrParseError,
    IoError(io::Error),
    FramingError(framing::Error),
    TimerError(timer::Error),
    OneshotError(OneshotRecvError),
}

type DataGram = (framing::Message, SocketAddr);
type Generation = u64;
pub const MAX_DATA_SIZE: usize = 1024;

impl std::fmt::Display for Error {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::result::Result<(), std::fmt::Error> {
        match self {
            Error::Empty => write!(f, "Empty Error"),
            Error::IoError(e) => write!(f, "IO Error: {}", e),
            Error::FramingError(e) => write!(f, "Framing Error: {}", e),
            Error::AddrParseError => write!(f, "Error Parsing Address"),
            Error::TimerError(e) => write!(f, "Error in tokio timer: {}", e),
            Error::OneshotError(e) => write!(f, "Error in internal messaging:{}", e),
        }
    }
}

impl std::error::Error for Error {}

impl From<()> for Error {
    fn from(_err: ()) -> Error {
        Error::Empty
    }
}

impl From<io::Error> for Error {
    fn from(err: io::Error) -> Error {
        Error::IoError(err)
    }
}

impl From<framing::Error> for Error {
    fn from(err: framing::Error) -> Error {
        Error::FramingError(err)
    }
}

impl From<timer::Error> for Error {
    fn from(err: timer::Error) -> Error {
        Error::TimerError(err)
    }
}

impl From<OneshotRecvError> for Error {
    fn from(err: OneshotRecvError) -> Error {
        Error::OneshotError(err)
    }
}

type Result<T> = std::result::Result<T, Error>;

#[derive(Serialize, Deserialize, Clone, Debug)]
pub struct PublisherDesc {
    pub name: String,
    pub host_name: String,
    pub port: u16,
    pub subscriber_expiration_interval: time::Duration,
}

impl PublisherDesc {
    async fn to_tokio_socket(&self) -> Result<UdpSocket> {
        let addr = match self.to_socket_addrs()?.next() {
            Some(addr) => addr,
            None => {
                return Err(Error::AddrParseError);
            }
        };
        Ok(UdpSocket::bind(&addr).await?)
    }
}

#[derive(Debug)]
pub enum PublisherConversionError {
    Time(proto::TimeError),
    NoExpiration,
}

impl std::fmt::Display for PublisherConversionError {
    fn fmt(&self, fmt: &mut std::fmt::Formatter<'_>) -> fmt::Result {
        write!(fmt, "Publisher Conversion Error: {:?}", self)
    }
}

impl std::error::Error for PublisherConversionError {
    fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
        None
    }
}

impl std::convert::From<proto::TimeError> for PublisherConversionError {
    fn from(error: proto::TimeError) -> Self {
        PublisherConversionError::Time(error)
    }
}

impl std::convert::TryFrom<proto::PublisherDesc> for PublisherDesc {
    type Error = PublisherConversionError;
    fn try_from(proto_value: proto::PublisherDesc) -> std::result::Result<Self, Self::Error> {
        let proto::PublisherDesc {
            name,
            host_name,
            port: port32,
            subscriber_expiration_interval: proto_interval,
        } = proto_value;
        let subscriber_expiration_interval: time::Duration = match proto_interval {
            Some(expiration) => expiration.into(),
            None => return Err(PublisherConversionError::NoExpiration),
        };
        let port: u16 = port32 as u16;
        Ok(Self {
            name,
            host_name,
            port,
            subscriber_expiration_interval,
        })
    }
}

impl<'a> ToSocketAddrs for PublisherDesc {
    type Iter = std::vec::IntoIter<SocketAddr>;
    fn to_socket_addrs(&self) -> io::Result<Self::Iter> {
        (self.host_name.as_str(), self.port).to_socket_addrs()
    }
}

impl fmt::Display for PublisherDesc {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        write!(
            f,
            "name: {}, host_name: {}, port: {}",
            self.name, self.host_name, self.port
        )
    }
}

#[derive(Serialize, Deserialize, Clone, Debug)]
pub struct ConnectionInfo {
    pub last_report: time::SystemTime,
    pub expiration: time::SystemTime,
}

#[cfg(test)]
mod tests {}