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annotate rust/src/sensor.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 ca8102feaca6
children 8c21df3711e2
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1 extern crate tokio_core;
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2 extern crate futures;
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3
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4 use std::time::Duration;
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5 use std::io;
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6 use std::fs::File;
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7 use std::io::Read;
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8
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9 use tokio_core::reactor::Interval;
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10 use tokio_core::reactor::Handle;
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11 use futures::Stream;
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12 use types::*;
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13 use config::Config;
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14
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15 pub trait Sensor {
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16 fn stream(handle: &Handle, config: &Config)
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17 -> Box<Stream<Item=Readings, Error=io::Error>>;
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18 }
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19
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20 pub struct OneWireSensor {
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21 config: Config,
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22 }
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23
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24 impl OneWireSensor {
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25 fn new(config: &Config) -> OneWireSensor {
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26 OneWireSensor {
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27 config: config.clone(),
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28 }
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29 }
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30
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31 fn step(&mut self) -> Readings {
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32 let mut r = Readings::new();
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33 r.add("ambient", Some(31.2));
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34 r.add("wort_todo", Some(8.0));
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35 debug!("sensor step {:?}", r);
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36 r
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37 }
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38
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39 fn sensor_names(&self) -> Vec<String> {
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40 let mut names = vec![];
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41 names
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42 }
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43 }
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44
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45 impl Sensor for OneWireSensor {
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46 fn stream(handle: &Handle, config: &Config)
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47 -> Box<Stream<Item=Readings, Error=io::Error>> {
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48 let mut s = OneWireSensor::new(config);
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49
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50 let dur = Duration::new(s.config.SENSOR_SLEEP,0);
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51 Interval::new(dur, handle).unwrap().map(move |()| {
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52 s.step()
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53 }).boxed()
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54 }
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55 }
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56
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57 pub struct TestSensor {
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58 config: Config,
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59 }
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60
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61 impl TestSensor {
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62 pub fn new(config: &Config) -> Self {
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63 TestSensor {
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64 config: config.clone(),
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65 }
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66 }
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67
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68 fn step(&mut self) -> Readings {
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69 let mut r = Readings::new();
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70 r.add("ambient", Some(31.2));
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71 r.add("wort", Some(Self::try_read("test_wort.txt").unwrap_or_else(|_| 18.0)));
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72 r.add("fridge", Some(Self::try_read("test_fridge.txt").unwrap_or_else(|_| 20.0)));
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73 r
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74 }
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75
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76 fn try_read(filename: &str) -> Result<f32, String> {
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77 File::open(filename)
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78 .map_err(|e| e.to_string())
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79 .and_then(|mut f| {
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80 let mut s = String::new();
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81 f.read_to_string(&mut s)
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82 .map_err(|e| e.to_string())
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83 .map(|_| s)
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84 })
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85 .and_then(|s| {
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86 s.trim().parse::<f32>()
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87 .map_err(|e| e.to_string())
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88 })
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89 }
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90 }
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91
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92 impl Sensor for TestSensor {
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93 fn stream(handle: &Handle, config: &Config)
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94 -> Box<Stream<Item=Readings, Error=io::Error>> {
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95 let mut s = TestSensor::new(config);
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96
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97 let dur = Duration::new(s.config.SENSOR_SLEEP,0);
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98 Interval::new(dur, handle).unwrap().map(move |()| {
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99 s.step()
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100 }).boxed()
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101 }
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102 }
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103