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annotate rust/src/sensor.rs @ 604:278f1002b5c7 rust

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sensor regex, custom error type
author Matt Johnston <matt@ucc.asn.au>
date Thu, 16 Feb 2017 23:53:46 +0800
parents b45b8b4cf0f5
children 8dd63473b6d8
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 extern crate tokio_core;
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2 extern crate futures;
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3 extern crate futures_cpupool;
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4 extern crate regex;
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5
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6 use std::time::Duration;
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7 use std::io;
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8 use std::fs::File;
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9 use std::io::{Read,BufReader,BufRead};
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10 use std::path::PathBuf;
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11 use std::error::Error;
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12 use std::sync::Arc;
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13 use std::str::FromStr;
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14
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15 use tokio_core::reactor::Interval;
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16 use tokio_core::reactor::Handle;
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17 use futures::Stream;
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18 use types::*;
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19 use ::Config;
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20
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21 pub trait Sensor {
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22 fn stream(&self, handle: &Handle)
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23 -> Box<Stream<Item=Readings, Error=io::Error>>;
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24 }
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25
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26 #[derive(Clone)]
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27 pub struct OneWireSensor {
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28 config: Arc<Config>,
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29 }
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30
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31 impl OneWireSensor {
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32 pub fn new(config: &Config) -> Self {
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33 OneWireSensor {
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34 config: Arc::new(config.clone()),
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35 }
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36 }
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37
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38 fn step(&self) -> Readings {
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39 let mut r = Readings::new();
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40
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41 if let Ok(names) = self.sensor_names() {
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42 for n in &names {
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43 match self.read_sensor(n) {
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44 Ok(s) => r.add(n, s),
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45 Err(e) => debug!("Error reading sensors {}: {}", n, e)
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46 }
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47 }
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48 }
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49
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50 debug!("sensor step {:?}", r);
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51 r
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52 }
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53
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54 fn read_sensor(&self, n: &str) -> Result<f32, Box<Error>> {
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55 lazy_static! {
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56 // multiline
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57 static ref THERM_RE: regex::Regex = regex::Regex::new("(?m).* YES\n.*t=(.*)\n").unwrap();
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58 }
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59 let mut path = PathBuf::from(&self.config.SENSOR_BASE_DIR);
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60 path.push(n);
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61 path.push("w1_slave");
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62 let mut s = String::new();
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63 File::open(path)?.read_to_string(&mut s)?;
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64 let caps = THERM_RE.captures(&s).ok_or_else(|| {
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65 TemplogError::new("Bad sensor contents match")
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66 })?;
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67 let v = caps.get(1).ok_or_else(|| {
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68 TemplogError::new("Bad field contents match")
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69 })?.as_str();
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70
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71 Ok(f32::from_str(v)?)
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72 }
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73
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74 fn sensor_names(&self) -> Result<Vec<String>, Box<Error>> {
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75 let mut path = PathBuf::from(&self.config.SENSOR_BASE_DIR);
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76 path.push("w1_master_slaves");
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77
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78 let f = BufReader::new(File::open(path)?);
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79 let s = f.lines().collect::<Result<Vec<String>, io::Error>>()?;
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80 Ok(s)
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81 }
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82 }
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83
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84 impl Sensor for OneWireSensor {
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85
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86 fn stream(&self, handle: &Handle) -> Box<Stream<Item=Readings, Error=io::Error>> {
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87 let pool = futures_cpupool::CpuPool::new(4); // TODO: how many?
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88
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89 let dur = Duration::new(self.config.SENSOR_SLEEP,0);
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90 let s = Arc::new(self.clone());
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91 Interval::new(dur, handle).unwrap()
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92 .and_then(move |()| {
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93 let a = s.clone();
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94 pool.spawn_fn(move || Ok(a.step()))
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95 })
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96 .boxed()
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97 }
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98 }
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99
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100 #[derive(Clone)]
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101 pub struct TestSensor {
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102 config: Config,
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103 }
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104
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105 impl TestSensor {
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106 pub fn new(config: &Config) -> Self {
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107 TestSensor {
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108 config: config.clone(),
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109 }
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110 }
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111
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112 fn test_step() -> Readings {
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113 let mut r = Readings::new();
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114 r.add("ambient", 31.2);
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115 r.add("wort", Self::try_read("test_wort.txt").unwrap_or_else(|_| 18.0));
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116 r.add("fridge", Self::try_read("test_fridge.txt").unwrap_or_else(|_| 20.0));
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117 r
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118 }
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119
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120 fn try_read(filename: &str) -> Result<f32, Box<Error>> {
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121 let mut s = String::new();
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122 File::open(filename)?.read_to_string(&mut s)?;
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123 Ok(s.trim().parse::<f32>()?)
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124 }
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125 }
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126
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127 impl Sensor for TestSensor {
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128 fn stream(&self, handle: &Handle)
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129 -> Box<Stream<Item=Readings, Error=io::Error>> {
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130
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131 let dur = Duration::new(self.config.SENSOR_SLEEP,0);
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132 Interval::new(dur, handle).unwrap()
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133 .and_then(move |()| {
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134 Ok(Self::test_step())
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135 }).boxed()
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136 }
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137 }
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138