Adapt settings system from woppleblox

Cargo.toml

@@ -7,12 +7,15 @@ edition = "2018"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-
+log = "0.4"					# Apparently Rust has an entire logging setup - this is the base crate
-log = "0.4"			# Apparently Rust has an entire logging setup - this is the base crate
 pretty_env_logger = "0.4"	# The logging implementation we've chosen for the above
 
-
 clap = "2"				# CLI argument parser
 
+serde = { version = "1.0", features = ["derive"] }	# Serialisation
+serde_derive = "1.0"	# Serialisation helper
+toml = "0.5"			# TOML serialisation module
+
+
 
 psk-client = { version = "0.1", features = ["vendored-openssl"] }	# Pre-shared key TLS support

src/main.rs

@@ -6,6 +6,12 @@ use std::process;
 
 use clap::{ App, AppSettings, Arg, SubCommand };
 
+
+
+mod settings;
+
+use settings::Settings;
+
 fn main() {
     // Initialise the logging system
     pretty_env_logger::init();

src/settings/definitions.rs

@@ -0,0 +1,20 @@
+
+use serde::{ Serialize, Deserialize };
+
+#[derive(Debug, Serialize, Deserialize, Clone)]
+pub struct Settings {
+    pub bind_address : String,
+    pub port : i16,
+    pub secret_join : String,
+    pub secret_query : String
+}
+impl Default for Settings {
+    fn default() -> Settings {
+        Settings {
+            bind_address: "127.0.0.1".to_string(),
+            port: 3015,
+            secret_join: "CHANGE_ME".to_string(),
+            secret_query: "CHANGE_ME".to_string()
+        }
+    }
+}

src/settings/mod.rs

@@ -0,0 +1,32 @@
+use std::fs;
+
+// for toml::toml!, which are aren't currently using
+// #[macro_use]
+// use toml;
+
+
+mod definitions;
+pub use definitions::Settings;
+
+
+impl Settings {
+    pub fn new() -> Settings {
+        Settings::default()
+    }
+    
+    /// Creates a new Settings object from the contents of a given (TOML) file.
+    pub fn from_file(filename : String) -> Settings {
+        let config_str = match fs::read_to_string(&filename) {
+            Ok(str) => str,
+            Err(error) => {
+                // println!("{}", error);
+                panic!("{}", error); // Oops, something went wrong while reading the config file
+            }
+        };
+        
+        let config_obj : Settings = toml::from_str(&config_str).unwrap();
+        // info!("{:?}", config_obj);
+        return config_obj;
+    }
+    
+}