Initial import

src/config.rs

@@ -0,0 +1,83 @@
+use log::LevelFilter;
+use serde::Deserialize;
+use serde_yaml::from_str;
+use std::io::Read;
+use std::{collections::HashMap, fs::File, path::Path, time::Duration};
+
+use crate::value::ValueType;
+
+#[derive(Debug, Deserialize)]
+#[serde(rename_all = "camelCase", untagged)]
+pub enum MqttAuth {
+    #[serde(rename_all = "camelCase")]
+    UserPass { username: String, password: String },
+    #[serde(rename_all = "camelCase")]
+    Certificate {
+        cert_file: String,
+        private_key_file: String,
+    },
+}
+
+#[derive(Debug, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub struct MqttConfig {
+    pub host: String,
+    pub port: u16,
+    pub client_id: String,
+    pub auth: Option<MqttAuth>,
+    pub ca_file: Option<String>,
+    pub connect_timeout: Option<Duration>,
+    pub keep_alive: Option<Duration>,
+}
+
+#[derive(Debug, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub struct TagValue {
+    pub r#type: ValueType,
+    pub value: String,
+}
+
+#[derive(Debug, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub struct UserAuth {
+    pub username: String,
+    pub password: String,
+}
+
+#[derive(Debug, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub struct InfluxDBConfig {
+    pub url: String,
+    pub auth: Option<UserAuth>,
+    pub db_name: String,
+    pub measurement: String,
+}
+
+#[derive(Debug, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub struct Mapping {
+    pub topic: String,
+    pub field_name: String,
+    pub value_type: ValueType,
+    pub tags: HashMap<String, TagValue>,
+}
+
+#[derive(Debug, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub struct Config {
+    pub log_level: Option<LevelFilter>,
+    pub mqtt: MqttConfig,
+    pub database: InfluxDBConfig,
+    pub mappings: Vec<Mapping>,
+}
+
+impl Config {
+    pub fn parse<P: AsRef<Path>>(filename: P) -> Result<Config, String> {
+        let mut f = File::open(filename).map_err(|err| err.to_string())?;
+        let mut contents = String::new();
+        f.read_to_string(&mut contents)
+            .map_err(|err| err.to_string())?;
+        let config: Config = from_str(&contents).map_err(|err| err.to_string())?;
+        Ok(config)
+    }
+}