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annotate rust/src/sensor.rs @ 632:bde302def78e rust

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moving to riker, nowhere near yet
author Matt Johnston <matt@ucc.asn.au>
date Thu, 22 Aug 2019 23:59:50 +0800
parents c57821a60e51
children 490e9e15b98c
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
632
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1 use riker::actors::*;
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2
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3 use std::time::Duration;
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4 use std::io;
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5 use std::fs::File;
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6 use std::io::{Read,BufReader,BufRead};
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7 use std::path::PathBuf;
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8
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9 use std::str::FromStr;
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10
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11 use super::types::*;
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12 use super::config::Config;
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13
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14 pub struct OneWireSensor {
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15 config: Config,
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16 fridge: Recipient<Readings>,
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17 }
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18
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19 impl Actor for OneWireSensor {
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20 type Context = Context<Self>;
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21 }
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22
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23 impl OneWireSensor {
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24 pub fn new(config: &Config, fridge: Recipient<Readings>) -> Self {
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25 OneWireSensor {
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26 config: config.clone(),
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27 }
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28 }
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29
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30 fn step(&self) -> Readings {
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31 let mut r = Readings::new();
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32
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33 if let Ok(names) = self.sensor_names() {
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34 for n in &names {
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35 match self.read_sensor(n) {
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36 Ok(s) => r.add(n, s),
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37 Err(e) => debug!("Error reading sensors {}: {}", n, e)
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38 }
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39 }
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40 }
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41
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42 debug!("sensor step {:?}", r);
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43 r
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44 }
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45
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46 fn read_sensor(&self, n: &str) -> Result<f32, TemplogError> {
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47 lazy_static! {
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48 // multiline
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49 static ref THERM_RE: regex::Regex = regex::Regex::new("(?m).* YES\n.*t=(.*)\n").unwrap();
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50 }
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51 let mut path = PathBuf::from(&self.config.SENSOR_BASE_DIR);
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52 path.push(n);
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53 path.push("w1_slave");
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54 let mut s = String::new();
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55 File::open(path)?.read_to_string(&mut s)?;
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56 let caps = THERM_RE.captures(&s).ok_or_else(|| {
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57 TemplogError::new("Bad sensor contents match")
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58 })?;
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59 let v = caps.get(1).ok_or_else(|| {
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60 TemplogError::new("Bad field contents match")
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61 })?.as_str();
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62
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63 Ok(f32::from_str(v)?)
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64 }
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65
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66 fn sensor_names(&self) -> Result<Vec<String>, TemplogError> {
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67 // TODO: needs to handle multiple busses.
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68 let mut path = PathBuf::from(&self.config.SENSOR_BASE_DIR);
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69 path.push("w1_master_slaves");
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70
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71 let f = BufReader::new(File::open(path)?);
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72 let s = f.lines().collect::<Result<Vec<String>, io::Error>>()?;
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73 Ok(s)
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74 }
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75 }
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76
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77 impl Sensor for OneWireSensor {
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78
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79 fn stream(&self, handle: &Handle) -> Box<Stream<Item=Readings, Error=TemplogError>> {
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80 let pool = futures_cpupool::CpuPool::new(4); // TODO: how many?
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81
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82 let dur = Duration::new(self.config.SENSOR_SLEEP,0);
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83 let s = Arc::new(self.clone());
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84 let i = Interval::new(dur, handle).unwrap()
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85 .map_err(|e| TemplogError::new_io("Interval failed. Should not happen", e))
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86 .and_then(move |()| {
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87 let a = s.clone();
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88 pool.spawn_fn(move || Ok(a.step()))
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89 });
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90 consume_errors(i)
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91 }
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92 }
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93
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94 #[derive(Clone)]
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95 pub struct TestSensor {
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96 config: Config,
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97 }
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98
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99 impl TestSensor {
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100 pub fn new(config: &Config) -> Self {
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101 TestSensor {
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102 config: config.clone(),
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103 }
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104 }
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105
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106 fn test_step() -> Readings {
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107 let mut r = Readings::new();
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108 r.add("ambient", 31.2);
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109 r.add("wort", Self::try_read("test_wort.txt").unwrap_or_else(|_| 18.0));
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110 r.add("fridge", Self::try_read("test_fridge.txt").unwrap_or_else(|_| 20.0));
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111 r
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112 }
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113
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114 fn try_read(filename: &str) -> Result<f32, TemplogError> {
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115 let mut s = String::new();
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116 File::open(filename)?.read_to_string(&mut s)?;
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117 Ok(s.trim().parse::<f32>()?)
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118 }
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119 }
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120
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121 impl Sensor for TestSensor {
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122 fn stream(&self, handle: &Handle) -> Box<Stream<Item=Readings, Error=TemplogError>> {
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123
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124 let dur = Duration::new(self.config.SENSOR_SLEEP,0);
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125 let i = Interval::new(dur, handle).unwrap()
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126 .map_err(|e| TemplogError::new_io("Interval failed. Should not happen", e))
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127 .and_then(move |()| {
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128 Ok(Self::test_step())
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129 });
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130 consume_errors(i)
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131 }
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132 }
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133