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annotate rust/src/fridge.rs @ 600:9c76f3cf01ea rust

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slightly less ugly
author Matt Johnston <matt@ucc.asn.au>
date Tue, 07 Feb 2017 22:57:29 +0800
parents a440eafa84a9
children 8c21df3711e2
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1 extern crate futures;
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2 extern crate tokio_core;
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3
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4 use std;
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5 use std::io;
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6 use std::mem;
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7 use std::time::{Duration,Instant};
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8
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9 use futures::{Future,future,Sink,Stream};
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10 use tokio_core::reactor::{Timeout,Handle};
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11 use futures::sync::{mpsc};
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12
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13 use config::Config;
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14 use types::*;
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15
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16 #[derive(Debug)]
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17 pub enum Message {
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18 Sensor {wort: Option<f32>, fridge: Option<f32>},
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19 Params (Params),
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20 Tick(u64),
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21 }
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22
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23 pub struct Fridge {
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24 config: Config,
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25 params: Params,
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26 temp_wort: Option<f32>,
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27 temp_fridge: Option<f32>,
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28
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29 // Timeouts to wake ourselves up again
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30 handle: Handle,
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31 timeout_s: mpsc::Sender<u64>,
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32 timeout_r: Option<mpsc::Receiver<u64>>,
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33 ticker: u64,
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34 last_off_time: Instant,
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35 }
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36
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37 impl Sink for Fridge {
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38
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39 type SinkItem = Message;
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40 type SinkError = std::io::Error;
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41
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42 fn start_send(&mut self, msg: Message)
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43 -> futures::StartSend<Self::SinkItem, Self::SinkError> {
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44 self.process_msg(msg);
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45 Ok(futures::AsyncSink::Ready)
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46 }
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47
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48 fn poll_complete(&mut self) -> futures::Poll<(), Self::SinkError> {
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49 Ok(futures::Async::Ready(()))
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50 }
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51 }
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52
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53 impl Fridge {
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54 pub fn new(config: &Config, nowait: bool, p: Params, handle: &Handle) -> Fridge {
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55 let (s, r) = mpsc::channel(1);
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56 let mut f = Fridge {
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57 config: config.clone(),
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58 params: p,
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59 temp_wort: None,
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60 temp_fridge: None,
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61
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62 handle: handle.clone(),
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63 timeout_s: s,
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64 timeout_r: Some(r),
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65 ticker: 0,
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66 last_off_time: Instant::now(),
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67 };
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68 if nowait {
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69 f.last_off_time -= Duration::new(config.FRIDGE_DELAY, 100);
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70 }
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71 f.tick();
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72 f
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73 }
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74
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75 /// The fridge needs to periodically wake itself up, the returned
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76 // stream of Tick messages does so.
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77 /// Examples of wakeups events are
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78 ///
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79 /// * overshoot calculation
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80 /// * minimum fridge-off time
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81 /// * invalid wort timeout
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82 pub fn wakeups(&mut self)
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83 -> Box<Stream<Item=Message, Error=io::Error>> {
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84 mem::replace(&mut self.timeout_r, None)
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85 .expect("NumberWatcher::timeouts() can only be called once")
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86 .map(|v| Message::Tick(v))
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87 .map_err(|_| io::Error::new(io::ErrorKind::Other, "Something wrong with watcher timeout channel"))
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88 .boxed()
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89 }
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90
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91 fn next_wakeup(&self) -> Duration {
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92 let millis = 400;
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93 let dur = Duration::from_millis(millis);
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94 dur
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95 }
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96
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97 fn tick(&mut self) {
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98 debug!("tick");
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99
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100 self.send_next_timeout();
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101 }
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102
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103 /// Sets the next self-wakeup timeout
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104 fn send_next_timeout(&mut self) {
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105 let waker = self.timeout_s.clone();
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106 let dur = self.next_wakeup();
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107 debug!("fridge next wakeup {:?}", dur);
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108 self.ticker += 1;
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109 let v = self.ticker;
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110 let t = Timeout::new(dur, &self.handle).unwrap()
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111 .map_err(|_| ())
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112 .and_then(move |_| {
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113 waker.send(v)
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114 .map_err(|e| {
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115 warn!("Send error in tick(): {}", e.to_string());
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116 ()
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117 })
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118 })
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119 .map(|_| ());
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120 self.handle.spawn(t);
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121 }
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122
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123 fn process_msg(&mut self, msg: Message)
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124 -> Box<Future<Item=(), Error=()>> {
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125 debug!("process_msg {:?}", msg);
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126 match msg {
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127 Message::Sensor{wort, fridge} => self.update_sensor(wort, fridge),
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128 Message::Params(p) => self.update_params(p),
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129 Message::Tick(v) => if v == self.ticker {self.tick()},
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130 };
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131 future::ok::<(),()>(()).boxed()
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132 }
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133
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134 pub fn update_params(&mut self, p: Params) {
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135 self.params = p;
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136 println!("fridge set_params {:?}", self.params);
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137
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138 self.tick();
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139 }
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140
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141 pub fn update_sensor(&mut self, wort: Option<f32>, fridge: Option<f32>) {
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142 self.temp_wort = wort;
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143 self.temp_fridge = fridge;
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144
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145 self.tick();
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146 }
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147
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148 }