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use std::cell::RefCell;
use std::collections::HashMap;
use std::fs::File;
use std::io::{Error, ErrorKind};
use std::net::{SocketAddrV4, UdpSocket};
use std::path::Path;
use std::thread;
use std::time::Duration;
use chrono::Utc;
use log;
use serde::{Deserialize, Serialize};
use serde_json::Value;
use serde_yaml;
use serialport::{self, SerialPort};
pub mod messages;
use messages::*;
pub use messages::{Measurement, SensorData};
#[cfg(test)]
pub mod tests;
pub type Result<T> = std::result::Result<T, Error>;
const BUFFER_SIZE: usize = 1024;
const TIMEOUT: Duration = Duration::from_secs(4);
#[derive(Debug, Deserialize, Serialize)]
pub struct DhtLoggerConfig {
port: String,
baud: u32,
logger_config: HashMap<String, Value>,
}
pub struct DhtLogger {
port: RefCell<Box<dyn SerialPort>>,
verbose: bool,
udp_addrs: Vec<SocketAddrV4>,
udp_socket: Option<UdpSocket>,
}
impl DhtLogger {
pub fn new(port: Box<dyn SerialPort>, logger_config: HashMap<String, Value>) -> DhtLogger {
let verbose = if let Some(verbose) = logger_config.get("verbose") {
if let Value::Bool(verbose) = verbose {
*verbose
} else {
panic!("logger.verbose must be boolean, got value: {}", verbose)
}
} else {
false
};
let default = Value::Array(Vec::new());
let udp_addrs: Vec<SocketAddrV4> = logger_config
.get("udp")
.unwrap_or(&default)
.as_array()
.expect("logger.udp must be a list")
.iter()
.map(|addr| {
addr.as_str().expect(&format!(
"UDP addresses must be strings, got value: {}",
addr
))
})
.map(|addr| {
addr.parse()
.expect(&format!("Failed to parse IP:PORT, got value: {}", addr))
})
.collect();
let udp_socket = match udp_addrs.len() {
0 => None,
_ => Some(UdpSocket::bind("0.0.0.0:0").unwrap()),
};
DhtLogger {
port: RefCell::new(port),
verbose,
udp_addrs,
udp_socket,
}
}
pub fn from_config(config_file: &Path) -> DhtLogger {
let config_file = File::open(config_file).unwrap();
let DhtLoggerConfig {
port,
baud,
logger_config,
} = match serde_yaml::from_reader(config_file) {
Ok(dht_logger) => dht_logger,
Err(_) => panic!("YAML parse error in DHT logger config."),
};
let port = serialport::new(port.clone(), baud)
.timeout(TIMEOUT)
.open()
.expect(&format!("Failed to open port: {}", port));
log::trace!("Data bits: {:?}", port.data_bits());
log::trace!("Flow control: {:?}", port.flow_control());
log::trace!("Parity: {:?}", port.parity());
log::trace!("Stop bits: {:?}", port.stop_bits());
log::trace!("Timeout: {:?}", port.timeout());
DhtLogger::new(port, logger_config)
}
pub fn port(&self) -> Option<String> {
self.port.borrow().name()
}
pub fn read_sensor(&self) -> Result<DhtSensors> {
let mut buffer: [u8; BUFFER_SIZE] = [0; BUFFER_SIZE];
let n_bytes = self.port.borrow_mut().read(&mut buffer)?;
let timestamp = Utc::now();
let raw = match serde_json::from_slice::<Value>(&buffer[..n_bytes])? {
Value::Object(map) => map,
_ => {
return Err(Error::new(
ErrorKind::InvalidData,
"DHT logger data must be a JSON mapping",
))
}
};
let mut sensors = HashMap::new();
for (key, value) in raw.iter() {
let value = if let Value::Object(map) = value {
map
} else {
panic!("Sensor value must be a JSON mapping, got value: {}", value);
};
let measurement = if let Some(error) = value.get("e") {
let error = if let Value::String(error) = error {
error
} else {
panic!("Error value must be a string, got value: {}", error);
};
Measurement::new(None, Some(error))
} else {
let raw: DhtDataRaw = serde_json::from_value(Value::Object(value.clone()))?;
Measurement::new(Some(SensorData::from(raw)), None)
};
if let Some(error) = measurement.get_error() {
log::warn!("Error reading '{}' sensor: {}", key, error);
continue;
}
let data = measurement.get_data().unwrap();
sensors.insert(String::from(key), data);
}
Ok(DhtSensors {
timestamp,
data: sensors,
})
}
pub fn wait_for_sensor(&self, retries: u32) -> Result<DhtSensors> {
let mut retry: u32 = 0;
loop {
match self.read_sensor() {
Ok(measurement) => {
return Ok(measurement);
}
Err(err) => {
retry += 1;
log::trace!("{}", err);
if retry == retries {
return Err(err);
}
thread::sleep(Duration::from_millis(100));
}
}
}
}
pub fn log_measurement(&self, measurement: DhtSensors) -> Result<()> {
let data_pretty = serde_json::to_string_pretty(&measurement)?;
let data_pretty = format!("Received measurement:\n{}", data_pretty);
if self.verbose {
log::info!("{}", data_pretty);
} else {
log::debug!("{}", data_pretty);
}
if let Some(udp_socket) = &self.udp_socket {
let data_json = serde_json::to_vec(&DhtSensorsSerde::from(measurement))?;
log::trace!("{}", std::str::from_utf8(data_json.as_slice()).unwrap());
for addr in self.udp_addrs.iter() {
let bytes_sent = udp_socket.send_to(data_json.as_slice(), addr)?;
log::trace!("Sent {} bytes to UDP addr: {:?}", bytes_sent, addr);
}
}
Ok(())
}
pub fn read_sensor_and_log_data(&self, retries: u32) {
let measurement = match self.wait_for_sensor(retries) {
Ok(data) => data,
Err(_) => return,
};
if let Err(err) = self.log_measurement(measurement) {
log::warn!("{}", err);
}
}
}