added rustfmt: a rustfmt.toml file diescribing syntax (soft tabs of 2 spaces), a CONTRIBUTING.md file to explain how to use rustfmt, a .drone.yml file to add code style checks in CI, 2 lines in README.md to present CONTRIBUTING.md, and applied rustfmt on the source

.drone.yml

@@ -0,0 +1,23 @@
+---
+kind: pipeline
+name: default
+
+workspace:
+  base: /drone/diplonat
+
+steps: 
+- name: code style
+  image: rust:1.47
+  commands:
+  - cargo fmt --all -- --check
+# - name: code quality
+#   image: rust:1.47
+#   commands:
+#   - cargo clippy -- --deny warnings
+# - name: test
+#   image: rust:1.47
+#   commands:
+#   - cargo build --verbose --all
+#   - cargo test --verbose --all
+
+  

.rustfmt.toml

@@ -0,0 +1,2 @@
+hard_tabs = false
+tab_spaces = 2

CONTRIBUTING.md

@@ -0,0 +1,34 @@
+# Contributing to Diplonat 
+
+## Development guidelines
+
+### Code formatting 
+
+[Our CI pipeline](./.drone.yml) features a verification of the code format, using [rustfmt](https://github.com/rust-lang/rustfmt).
+
+#### Installing rustfmt
+
+You can run `rustfmt` with Rust 1.24 and above.
+
+To install: 
+
+```
+rustup component add rustfmt
+```
+
+#### Usage 
+
+To run on Diplonat, launch the following in the root directory:
+
+```
+cargo fmt --all
+``` 
+
+This will format the whole repository using the settigs defined in [`.rustfmt.toml`](./.rustfmt.toml): soft tabs of 2 spaces.
+
+#### Auto-format code
+
+You can automate formatting in a number of ways:
+
+* [Setup your IDE to use `rustfmt`](https://github.com/rust-lang/rustfmt#running-rustfmt-from-your-editor).
+* Setup a git hook to run `rustfmt` before each commit.

README.md

@@ -48,6 +48,10 @@ export RUST_LOG=debug
 cargo run
 ```
 
+## Contributing
+
+Refer to [CONTRIBUTING.md](./CONTRIBUTING.md).
+
 ## Design Guidelines
 
 Diplonat is made of a set of Components.

src/config/mod.rs

@@ -4,7 +4,9 @@ mod options_test;
 mod runtime;
 
 pub use options::{ConfigOpts, ConfigOptsAcme, ConfigOptsBase, ConfigOptsConsul};
-pub use runtime::{RuntimeConfig, RuntimeConfigAcme, RuntimeConfigConsul, RuntimeConfigFirewall, RuntimeConfigIgd};
+pub use runtime::{
+  RuntimeConfig, RuntimeConfigAcme, RuntimeConfigConsul, RuntimeConfigFirewall, RuntimeConfigIgd,
+};
 
 pub const EXPIRATION_TIME: u16 = 300;
 pub const REFRESH_TIME: u16 = 60;

src/config/options.rs

@@ -11,66 +11,68 @@ use crate::config::RuntimeConfig;
 /// Base configuration options
 #[derive(Clone, Default, Deserialize)]
 pub struct ConfigOptsBase {
-	/// This node's private IP address [default: None]
+  /// This node's private IP address [default: None]
-	pub private_ip: Option<String>,
+  pub private_ip: Option<String>,
-	/// Expiration time for IGD rules [default: 60]
+  /// Expiration time for IGD rules [default: 60]
-	pub expiration_time: Option<u16>,
+  pub expiration_time: Option<u16>,
-	/// Refresh time for IGD and Firewall rules [default: 300]
+  /// Refresh time for IGD and Firewall rules [default: 300]
-	pub refresh_time: Option<u16>,
+  pub refresh_time: Option<u16>,
 }
 
 /// ACME configuration options
 #[derive(Clone, Default, Deserialize)]
 pub struct ConfigOptsAcme {
-	/// Whether ACME is enabled [default: false]
+  /// Whether ACME is enabled [default: false]
-	#[serde(default)]
+  #[serde(default)]
-	pub enable: bool,
+  pub enable: bool,
 
-	/// The default domain holder's e-mail [default: None]
+  /// The default domain holder's e-mail [default: None]
-	pub email: Option<String>,
+  pub email: Option<String>,
 }
 
 /// Consul configuration options
 #[derive(Clone, Default, Deserialize)]
 pub struct ConfigOptsConsul {
-	/// Consul's node name [default: None]
+  /// Consul's node name [default: None]
-	pub node_name: Option<String>,
+  pub node_name: Option<String>,
-	/// Consul's REST URL [default: "http://127.0.0.1:8500"]
+  /// Consul's REST URL [default: "http://127.0.0.1:8500"]
-	pub url: Option<String>,
+  pub url: Option<String>,
 }
 
 /// Model of all potential configuration options
 pub struct ConfigOpts {
-	pub base: ConfigOptsBase,
+  pub base: ConfigOptsBase,
-	pub acme: ConfigOptsAcme,
+  pub acme: ConfigOptsAcme,
-	pub consul: ConfigOptsConsul,
+  pub consul: ConfigOptsConsul,
 }
 
 impl ConfigOpts {
-	pub fn from_env() -> Result<RuntimeConfig> {
+  pub fn from_env() -> Result<RuntimeConfig> {
-		let base: ConfigOptsBase = envy::prefixed("DIPLONAT_").from_env()?;
+    let base: ConfigOptsBase = envy::prefixed("DIPLONAT_").from_env()?;
-		let consul: ConfigOptsConsul = envy::prefixed("DIPLONAT_CONSUL_").from_env()?;
+    let consul: ConfigOptsConsul = envy::prefixed("DIPLONAT_CONSUL_").from_env()?;
-		let acme: ConfigOptsAcme = envy::prefixed("DIPLONAT_ACME_").from_env()?;
+    let acme: ConfigOptsAcme = envy::prefixed("DIPLONAT_ACME_").from_env()?;
 
-		RuntimeConfig::new(Self {
+    RuntimeConfig::new(Self {
-			base: base,
+      base: base,
-			consul: consul,
+      consul: consul,
-			acme: acme,
+      acme: acme,
-		})
+    })
-	}
+  }
 
-	// Currently only used in tests
+  // Currently only used in tests
-	#[allow(dead_code)]
+  #[allow(dead_code)]
-	pub fn from_iter<Iter: Clone>(iter: Iter) -> Result<RuntimeConfig>
+  pub fn from_iter<Iter: Clone>(iter: Iter) -> Result<RuntimeConfig>
-	where Iter: IntoIterator<Item = (String, String)> {
+  where
-		let base: ConfigOptsBase = envy::prefixed("DIPLONAT_").from_iter(iter.clone())?;
+    Iter: IntoIterator<Item = (String, String)>,
-		let consul: ConfigOptsConsul = envy::prefixed("DIPLONAT_CONSUL_").from_iter(iter.clone())?;
+  {
-		let acme: ConfigOptsAcme = envy::prefixed("DIPLONAT_ACME_").from_iter(iter.clone())?;
+    let base: ConfigOptsBase = envy::prefixed("DIPLONAT_").from_iter(iter.clone())?;
+    let consul: ConfigOptsConsul = envy::prefixed("DIPLONAT_CONSUL_").from_iter(iter.clone())?;
+    let acme: ConfigOptsAcme = envy::prefixed("DIPLONAT_ACME_").from_iter(iter.clone())?;
 
-		RuntimeConfig::new(Self {
+    RuntimeConfig::new(Self {
-			base: base,
+      base: base,
-			consul: consul,
+      consul: consul,
-			acme: acme,
+      acme: acme,
-		})
+    })
-	}
+  }
 }

src/config/options_test.rs

@@ -10,111 +10,120 @@ use crate::config::*;
 // This is why we only test ConfigOpts::from_iter(iter).
 
 fn minimal_valid_options() -> HashMap<String, String> {
-	let mut opts = HashMap::new();
+  let mut opts = HashMap::new();
-	opts.insert("DIPLONAT_PRIVATE_IP".to_string(), "172.123.43.555".to_string());
+  opts.insert(
-    opts.insert("DIPLONAT_CONSUL_NODE_NAME".to_string(), "consul_node".to_string());
+    "DIPLONAT_PRIVATE_IP".to_string(),
-    opts
+    "172.123.43.555".to_string(),
+  );
+  opts.insert(
+    "DIPLONAT_CONSUL_NODE_NAME".to_string(),
+    "consul_node".to_string(),
+  );
+  opts
 }
 
 fn all_valid_options() -> HashMap<String, String> {
-	let mut opts = minimal_valid_options();
+  let mut opts = minimal_valid_options();
-	opts.insert("DIPLONAT_EXPIRATION_TIME".to_string(), "30".to_string());
+  opts.insert("DIPLONAT_EXPIRATION_TIME".to_string(), "30".to_string());
-	opts.insert("DIPLONAT_REFRESH_TIME".to_string(), "10".to_string());
+  opts.insert("DIPLONAT_REFRESH_TIME".to_string(), "10".to_string());
-    opts.insert("DIPLONAT_CONSUL_URL".to_string(), "http://127.0.0.1:9999".to_string());
+  opts.insert(
-	opts.insert("DIPLONAT_ACME_ENABLE".to_string(), "true".to_string());
+    "DIPLONAT_CONSUL_URL".to_string(),
-	opts.insert("DIPLONAT_ACME_EMAIL".to_string(), "bozo@bozo.net".to_string());
+    "http://127.0.0.1:9999".to_string(),
-    opts
+  );
+  opts.insert("DIPLONAT_ACME_ENABLE".to_string(), "true".to_string());
+  opts.insert(
+    "DIPLONAT_ACME_EMAIL".to_string(),
+    "bozo@bozo.net".to_string(),
+  );
+  opts
 }
 
 #[test]
 #[should_panic]
 fn err_empty_env() {
-	std::env::remove_var("DIPLONAT_PRIVATE_IP");
+  std::env::remove_var("DIPLONAT_PRIVATE_IP");
-	std::env::remove_var("DIPLONAT_CONSUL_NODE_NAME");
+  std::env::remove_var("DIPLONAT_CONSUL_NODE_NAME");
-	ConfigOpts::from_env().unwrap();
+  ConfigOpts::from_env().unwrap();
 }
 
 #[test]
 fn ok_from_iter_minimal_valid_options() {
-	let opts = minimal_valid_options();
+  let opts = minimal_valid_options();
-	let rt_config = ConfigOpts::from_iter(opts.clone()).unwrap();
+  let rt_config = ConfigOpts::from_iter(opts.clone()).unwrap();
 
-	assert!(rt_config.acme.is_none());
+  assert!(rt_config.acme.is_none());
-	assert_eq!(
+  assert_eq!(
-		&rt_config.consul.node_name, 
+    &rt_config.consul.node_name,
-		opts.get(&"DIPLONAT_CONSUL_NODE_NAME".to_string()).unwrap()
+    opts.get(&"DIPLONAT_CONSUL_NODE_NAME".to_string()).unwrap()
-	);
+  );
-	assert_eq!(
+  assert_eq!(rt_config.consul.url, CONSUL_URL.to_string());
-		rt_config.consul.url, 
+  assert_eq!(
-		CONSUL_URL.to_string()
+    rt_config.firewall.refresh_time,
-	);
+    Duration::from_secs(REFRESH_TIME.into())
-	assert_eq!(
+  );
-		rt_config.firewall.refresh_time,
+  assert_eq!(
-		Duration::from_secs(REFRESH_TIME.into())
+    &rt_config.igd.private_ip,
-	);
+    opts.get(&"DIPLONAT_PRIVATE_IP".to_string()).unwrap()
-	assert_eq!(
+  );
-		&rt_config.igd.private_ip,
+  assert_eq!(
-		opts.get(&"DIPLONAT_PRIVATE_IP".to_string()).unwrap()
+    rt_config.igd.expiration_time,
-	);
+    Duration::from_secs(EXPIRATION_TIME.into())
-	assert_eq!(
+  );
-		rt_config.igd.expiration_time,
+  assert_eq!(
-		Duration::from_secs(EXPIRATION_TIME.into())
+    rt_config.igd.refresh_time,
-	);
+    Duration::from_secs(REFRESH_TIME.into())
-	assert_eq!(
+  );
-		rt_config.igd.refresh_time,
-		Duration::from_secs(REFRESH_TIME.into())
-	);
 }
 
 #[test]
 #[should_panic]
 fn err_from_iter_invalid_refresh_time() {
-	let mut opts = minimal_valid_options();
+  let mut opts = minimal_valid_options();
-	opts.insert("DIPLONAT_EXPIRATION_TIME".to_string(), "60".to_string());
+  opts.insert("DIPLONAT_EXPIRATION_TIME".to_string(), "60".to_string());
-	opts.insert("DIPLONAT_REFRESH_TIME".to_string(), "60".to_string());
+  opts.insert("DIPLONAT_REFRESH_TIME".to_string(), "60".to_string());
-	ConfigOpts::from_iter(opts).unwrap();
+  ConfigOpts::from_iter(opts).unwrap();
 }
 
 #[test]
 fn ok_from_iter_all_valid_options() {
-	let opts = all_valid_options();
+  let opts = all_valid_options();
-	let rt_config = ConfigOpts::from_iter(opts.clone()).unwrap();
+  let rt_config = ConfigOpts::from_iter(opts.clone()).unwrap();
 
-	let expiration_time = Duration::from_secs(
+  let expiration_time = Duration::from_secs(
-		opts.get(&"DIPLONAT_EXPIRATION_TIME".to_string()).unwrap()
+    opts
-			.parse::<u64>().unwrap()
+      .get(&"DIPLONAT_EXPIRATION_TIME".to_string())
-			.into());
+      .unwrap()
-	let refresh_time = Duration::from_secs(
+      .parse::<u64>()
-		opts.get(&"DIPLONAT_REFRESH_TIME".to_string()).unwrap()
+      .unwrap()
-			.parse::<u64>().unwrap()
+      .into(),
-			.into());
+  );
+  let refresh_time = Duration::from_secs(
+    opts
+      .get(&"DIPLONAT_REFRESH_TIME".to_string())
+      .unwrap()
+      .parse::<u64>()
+      .unwrap()
+      .into(),
+  );
 
-	assert!(rt_config.acme.is_some());
+  assert!(rt_config.acme.is_some());
-	assert_eq!(
+  assert_eq!(
-		&rt_config.acme.unwrap().email,
+    &rt_config.acme.unwrap().email,
-		opts.get(&"DIPLONAT_ACME_EMAIL".to_string()).unwrap());
+    opts.get(&"DIPLONAT_ACME_EMAIL".to_string()).unwrap()
-	assert_eq!(
+  );
-		&rt_config.consul.node_name, 
+  assert_eq!(
-		opts.get(&"DIPLONAT_CONSUL_NODE_NAME".to_string()).unwrap()
+    &rt_config.consul.node_name,
-	);
+    opts.get(&"DIPLONAT_CONSUL_NODE_NAME".to_string()).unwrap()
-	assert_eq!(
+  );
-		&rt_config.consul.url, 
+  assert_eq!(
-		opts.get(&"DIPLONAT_CONSUL_URL".to_string()).unwrap()
+    &rt_config.consul.url,
-	);
+    opts.get(&"DIPLONAT_CONSUL_URL".to_string()).unwrap()
-	assert_eq!(
+  );
-		rt_config.firewall.refresh_time,
+  assert_eq!(rt_config.firewall.refresh_time, refresh_time);
-		refresh_time
+  assert_eq!(
-	);
+    &rt_config.igd.private_ip,
-	assert_eq!(
+    opts.get(&"DIPLONAT_PRIVATE_IP".to_string()).unwrap()
-		&rt_config.igd.private_ip,
+  );
-		opts.get(&"DIPLONAT_PRIVATE_IP".to_string()).unwrap()
+  assert_eq!(rt_config.igd.expiration_time, expiration_time);
-	);
+  assert_eq!(rt_config.igd.refresh_time, refresh_time);
-	assert_eq!(
-		rt_config.igd.expiration_time,
-		expiration_time
-	);
-	assert_eq!(
-		rt_config.igd.refresh_time,
-		refresh_time
-	);
 }

src/config/runtime.rs

@@ -1,6 +1,6 @@
 use std::time::Duration;
 
-use anyhow::{Result, anyhow};
+use anyhow::{anyhow, Result};
 
 use crate::config::{ConfigOpts, ConfigOptsAcme, ConfigOptsBase, ConfigOptsConsul};
 
@@ -11,111 +11,109 @@ use crate::config::{ConfigOpts, ConfigOptsAcme, ConfigOptsBase, ConfigOptsConsul
 
 #[derive(Debug)]
 pub struct RuntimeConfigAcme {
-	pub email: String,
+  pub email: String,
 }
 
 #[derive(Debug)]
 pub struct RuntimeConfigConsul {
-	pub node_name: String,
+  pub node_name: String,
-	pub url: String,
+  pub url: String,
 }
 
 #[derive(Debug)]
 pub struct RuntimeConfigFirewall {
-	pub refresh_time: Duration,
+  pub refresh_time: Duration,
 }
 
 #[derive(Debug)]
 pub struct RuntimeConfigIgd {
-	pub private_ip: String,
+  pub private_ip: String,
-	pub expiration_time: Duration,
+  pub expiration_time: Duration,
-	pub refresh_time: Duration,
+  pub refresh_time: Duration,
 }
 
 #[derive(Debug)]
 pub struct RuntimeConfig {
-	pub acme: Option<RuntimeConfigAcme>,
+  pub acme: Option<RuntimeConfigAcme>,
-	pub consul: RuntimeConfigConsul,
+  pub consul: RuntimeConfigConsul,
-	pub firewall: RuntimeConfigFirewall,
+  pub firewall: RuntimeConfigFirewall,
-	pub igd: RuntimeConfigIgd,
+  pub igd: RuntimeConfigIgd,
 }
 
 impl RuntimeConfig {
-	pub fn new(opts: ConfigOpts) -> Result<Self> {
+  pub fn new(opts: ConfigOpts) -> Result<Self> {
-		let acme = RuntimeConfigAcme::new(opts.acme.clone())?;
+    let acme = RuntimeConfigAcme::new(opts.acme.clone())?;
-		let consul = RuntimeConfigConsul::new(opts.consul.clone())?;
+    let consul = RuntimeConfigConsul::new(opts.consul.clone())?;
-		let firewall = RuntimeConfigFirewall::new(opts.base.clone())?;
+    let firewall = RuntimeConfigFirewall::new(opts.base.clone())?;
-		let igd = RuntimeConfigIgd::new(opts.base.clone())?;
+    let igd = RuntimeConfigIgd::new(opts.base.clone())?;
 
-		Ok(Self {
+    Ok(Self {
-			acme,
+      acme,
-			consul,
+      consul,
-			firewall,
+      firewall,
-			igd,
+      igd,
-		})
+    })
-	}
+  }
 }
 
 impl RuntimeConfigAcme {
-	pub fn new(opts: ConfigOptsAcme) -> Result<Option<Self>> {
+  pub fn new(opts: ConfigOptsAcme) -> Result<Option<Self>> {
-		if !opts.enable {
+    if !opts.enable {
-			return Ok(None);
+      return Ok(None);
-		}
+    }
 
-		let email = opts.email.expect(
+    let email = opts.email.expect(
-			"'DIPLONAT_ACME_EMAIL' environment variable is required \
+      "'DIPLONAT_ACME_EMAIL' environment variable is required \
-			if 'DIPLONAT_ACME_ENABLE' == 'true'");
+			if 'DIPLONAT_ACME_ENABLE' == 'true'",
+    );
 
-		Ok(Some(Self {
+    Ok(Some(Self { email }))
-			email,
+  }
-		}))
-	}
 }
 
 impl RuntimeConfigConsul {
-	pub(super) fn new(opts: ConfigOptsConsul) -> Result<Self> {
+  pub(super) fn new(opts: ConfigOptsConsul) -> Result<Self> {
-		let node_name = opts.node_name.expect(
+    let node_name = opts
-			"'DIPLONAT_CONSUL_NODE_NAME' environment variable is required");
+      .node_name
-		let url = opts.url.unwrap_or(super::CONSUL_URL.to_string());
+      .expect("'DIPLONAT_CONSUL_NODE_NAME' environment variable is required");
+    let url = opts.url.unwrap_or(super::CONSUL_URL.to_string());
 
-		Ok(Self {
+    Ok(Self { node_name, url })
-			node_name,
+  }
-			url,
-		})
-	}
 }
 
 impl RuntimeConfigFirewall {
-	pub(super) fn new(opts: ConfigOptsBase) -> Result<Self> {
+  pub(super) fn new(opts: ConfigOptsBase) -> Result<Self> {
-		let refresh_time = Duration::from_secs(
+    let refresh_time = Duration::from_secs(opts.refresh_time.unwrap_or(super::REFRESH_TIME).into());
-				opts.refresh_time.unwrap_or(super::REFRESH_TIME).into());
 
-		Ok(Self {
+    Ok(Self { refresh_time })
-			refresh_time,
+  }
-		})
-	}
 }
 
 impl RuntimeConfigIgd {
-	pub(super) fn new(opts: ConfigOptsBase) -> Result<Self> {
+  pub(super) fn new(opts: ConfigOptsBase) -> Result<Self> {
-		let private_ip = opts.private_ip.expect(
+    let private_ip = opts
-			"'DIPLONAT_PRIVATE_IP' environment variable is required");
+      .private_ip
-		let expiration_time = Duration::from_secs(
+      .expect("'DIPLONAT_PRIVATE_IP' environment variable is required");
-				opts.expiration_time.unwrap_or(super::EXPIRATION_TIME).into());
+    let expiration_time = Duration::from_secs(
-		let refresh_time = Duration::from_secs(
+      opts
-				opts.refresh_time.unwrap_or(super::REFRESH_TIME).into());
+        .expiration_time
+        .unwrap_or(super::EXPIRATION_TIME)
+        .into(),
+    );
+    let refresh_time = Duration::from_secs(opts.refresh_time.unwrap_or(super::REFRESH_TIME).into());
 
-		if refresh_time.as_secs() * 2 > expiration_time.as_secs() {
+    if refresh_time.as_secs() * 2 > expiration_time.as_secs() {
-	      return Err(anyhow!(
+      return Err(anyhow!(
 	        "IGD expiration time (currently: {}s) must be at least twice bigger than refresh time (currently: {}s)", 
 	        expiration_time.as_secs(),
 	        refresh_time.as_secs()));
-	    }
+    }
 
-		Ok(Self {
+    Ok(Self {
-			private_ip,
+      private_ip,
-			expiration_time,
+      expiration_time,
-			refresh_time,
+      refresh_time,
-		})
+    })
-	}
+  }
 }

src/consul.rs

@@ -1,21 +1,21 @@
-use serde::{Serialize, Deserialize};
+use anyhow::{anyhow, Result};
+use serde::{Deserialize, Serialize};
 use std::collections::HashMap;
-use anyhow::{Result, anyhow};
 
 #[derive(Serialize, Deserialize, Debug)]
 pub struct ServiceEntry {
-  pub Tags: Vec<String>
+  pub Tags: Vec<String>,
 }
 
 #[derive(Serialize, Deserialize, Debug)]
 pub struct CatalogNode {
-  pub Services: HashMap<String, ServiceEntry>
+  pub Services: HashMap<String, ServiceEntry>,
 }
 
 pub struct Consul {
   client: reqwest::Client,
   url: String,
-  idx: Option<u64>
+  idx: Option<u64>,
 }
 
 impl Consul {
@@ -23,7 +23,7 @@ impl Consul {
     return Self {
       client: reqwest::Client::new(),
       url: url.to_string(),
-      idx: None
+      idx: None,
     };
   }
 
@@ -34,16 +34,16 @@ impl Consul {
   pub async fn watch_node(&mut self, host: &str) -> Result<CatalogNode> {
     let url = match self.idx {
       Some(i) => format!("{}/v1/catalog/node/{}?index={}", self.url, host, i),
-      None => format!("{}/v1/catalog/node/{}", self.url, host)
+      None => format!("{}/v1/catalog/node/{}", self.url, host),
     };
 
     let http = self.client.get(&url).send().await?;
     self.idx = match http.headers().get("X-Consul-Index") {
       Some(v) => Some(v.to_str()?.parse::<u64>()?),
-      None => return Err(anyhow!("X-Consul-Index header not found"))
+      None => return Err(anyhow!("X-Consul-Index header not found")),
     };
 
     let resp: CatalogNode = http.json().await?;
-    return Ok(resp)
+    return Ok(resp);
   }
 }

src/consul_actor.rs

@@ -1,24 +1,24 @@
-use std::cmp;
+use crate::consul;
-use std::time::Duration;
+use crate::messages;
+use anyhow::Result;
 use log::*;
+use serde::{Deserialize, Serialize};
+use serde_lexpr::{error, from_str};
+use std::cmp;
+use std::collections::HashSet;
+use std::time::Duration;
 use tokio::sync::watch;
 use tokio::time::delay_for;
-use anyhow::Result;
-use serde::{Serialize, Deserialize};
-use serde_lexpr::{from_str,error};
-use crate::messages;
-use crate::consul;
-use std::collections::HashSet;
 
 #[derive(Serialize, Deserialize, Debug)]
 pub enum DiplonatParameter {
   tcp_port(HashSet<u16>),
-  udp_port(HashSet<u16>)
+  udp_port(HashSet<u16>),
 }
 
 #[derive(Serialize, Deserialize, Debug)]
 pub enum DiplonatConsul {
-  diplonat(Vec<DiplonatParameter>)
+  diplonat(Vec<DiplonatParameter>),
 }
 
 pub struct ConsulActor {
@@ -27,13 +27,16 @@ pub struct ConsulActor {
   consul: consul::Consul,
   node: String,
   retries: u32,
-  tx_open_ports: watch::Sender<messages::PublicExposedPorts>
+  tx_open_ports: watch::Sender<messages::PublicExposedPorts>,
 }
 
 fn retry_to_time(retries: u32, max_time: Duration) -> Duration {
   // 1.2^x seems to be a good value to exponentially increase time at a good pace
   // eg. 1.2^32 = 341 seconds ~= 5 minutes - ie. after 32 retries we wait 5 minutes
-  return Duration::from_secs(cmp::min(max_time.as_secs(), 1.2f64.powf(retries as f64) as u64))
+  return Duration::from_secs(cmp::min(
+    max_time.as_secs(),
+    1.2f64.powf(retries as f64) as u64,
+  ));
 }
 
 fn to_parameters(catalog: &consul::CatalogNode) -> Vec<DiplonatConsul> {
@@ -55,7 +58,7 @@ fn to_parameters(catalog: &consul::CatalogNode) -> Vec<DiplonatConsul> {
 fn to_open_ports(params: &Vec<DiplonatConsul>) -> messages::PublicExposedPorts {
   let mut op = messages::PublicExposedPorts {
     tcp_ports: HashSet::new(),
-    udp_ports: HashSet::new()
+    udp_ports: HashSet::new(),
   };
 
   for conf in params {
@@ -73,9 +76,9 @@ fn to_open_ports(params: &Vec<DiplonatConsul>) -> messages::PublicExposedPorts {
 
 impl ConsulActor {
   pub fn new(url: &str, node: &str) -> Self {
-    let (tx, rx) = watch::channel(messages::PublicExposedPorts{
+    let (tx, rx) = watch::channel(messages::PublicExposedPorts {
       tcp_ports: HashSet::new(),
-      udp_ports: HashSet::new()
+      udp_ports: HashSet::new(),
     });
 
     return Self {
@@ -95,7 +98,11 @@ impl ConsulActor {
           self.consul.watch_node_reset();
           self.retries = cmp::min(std::u32::MAX - 1, self.retries) + 1;
           let will_retry_in = retry_to_time(self.retries, Duration::from_secs(600));
-          error!("Failed to query consul. Will retry in {}s. {}", will_retry_in.as_secs(), e);
+          error!(
+            "Failed to query consul. Will retry in {}s. {}",
+            will_retry_in.as_secs(),
+            e
+          );
           delay_for(will_retry_in).await;
           continue;
         }

src/diplonat.rs

@@ -19,22 +19,20 @@ impl Diplonat {
 
     let ca = ConsulActor::new(&rt_cfg.consul.url, &rt_cfg.consul.node_name);
 
-    let fw = FirewallActor::new(
+    let fw = FirewallActor::new(rt_cfg.firewall.refresh_time, &ca.rx_open_ports).await?;
-        rt_cfg.firewall.refresh_time,
-        &ca.rx_open_ports
-    ).await?;
 
     let ia = IgdActor::new(
       &rt_cfg.igd.private_ip,
       rt_cfg.igd.refresh_time,
       rt_cfg.igd.expiration_time,
-      &ca.rx_open_ports
+      &ca.rx_open_ports,
-    ).await?;
+    )
+    .await?;
 
     let ctx = Self {
       consul: ca,
       igd: ia,
-      firewall: fw
+      firewall: fw,
     };
 
     return Ok(ctx);

src/fw.rs

@@ -1,81 +1,97 @@
+use crate::messages;
+use anyhow::{Context, Result};
 use iptables;
+use log::*;
 use regex::Regex;
 use std::collections::HashSet;
-use crate::messages;
-use anyhow::{Result,Context};
-use log::*;
 
 pub fn setup(ipt: &iptables::IPTables) -> Result<()> {
+  // ensure we start from a clean state without any rule already set
+  cleanup(ipt)?;
 
-    // ensure we start from a clean state without any rule already set
+  ipt
-    cleanup(ipt)?;
+    .new_chain("filter", "DIPLONAT")
+    .context("Failed to create new chain")?;
+  ipt
+    .insert_unique("filter", "INPUT", "-j DIPLONAT", 1)
+    .context("Failed to insert jump rule")?;
 
-    ipt.new_chain("filter", "DIPLONAT").context("Failed to create new chain")?;
+  Ok(())
-    ipt.insert_unique("filter", "INPUT", "-j DIPLONAT", 1).context("Failed to insert jump rule")?;
-
-    Ok(())
 }
 
 pub fn open_ports(ipt: &iptables::IPTables, ports: messages::PublicExposedPorts) -> Result<()> {
-    for p in ports.tcp_ports {
+  for p in ports.tcp_ports {
-        ipt.append("filter", "DIPLONAT", &format!("-p tcp --dport {} -j ACCEPT", p)).context("Failed to insert port rule")?;
+    ipt
-    }
+      .append(
+        "filter",
+        "DIPLONAT",
+        &format!("-p tcp --dport {} -j ACCEPT", p),
+      )
+      .context("Failed to insert port rule")?;
+  }
 
-    for p in ports.udp_ports {
+  for p in ports.udp_ports {
-        ipt.append("filter", "DIPLONAT", &format!("-p udp --dport {} -j ACCEPT", p)).context("Failed to insert port rule")?;
+    ipt
-    }
+      .append(
+        "filter",
+        "DIPLONAT",
+        &format!("-p udp --dport {} -j ACCEPT", p),
+      )
+      .context("Failed to insert port rule")?;
+  }
 
-    Ok(())
+  Ok(())
 }
 
 pub fn get_opened_ports(ipt: &iptables::IPTables) -> Result<messages::PublicExposedPorts> {
-    let mut ports = messages::PublicExposedPorts {
+  let mut ports = messages::PublicExposedPorts {
-        tcp_ports: HashSet::new(),
+    tcp_ports: HashSet::new(),
-        udp_ports: HashSet::new()
+    udp_ports: HashSet::new(),
-    };
+  };
 
-    let list = ipt.list("filter", "DIPLONAT")?;
+  let list = ipt.list("filter", "DIPLONAT")?;
-    let re = Regex::new(r"\-A.*? \-p (\w+).*\-\-dport (\d+).*?\-j ACCEPT").context("Regex matching open ports encountered an unexpected rule")?;
+  let re = Regex::new(r"\-A.*? \-p (\w+).*\-\-dport (\d+).*?\-j ACCEPT")
-    for i in list {
+    .context("Regex matching open ports encountered an unexpected rule")?;
-        let caps = re.captures(&i);
+  for i in list {
-        match caps {
+    let caps = re.captures(&i);
-            Some(c) => {
+    match caps {
+      Some(c) => {
+        if let (Some(raw_proto), Some(raw_port)) = (c.get(1), c.get(2)) {
+          let proto = String::from(raw_proto.as_str());
+          let number = String::from(raw_port.as_str()).parse::<u16>()?;
 
-                if let (Some(raw_proto), Some(raw_port)) = (c.get(1), c.get(2)) {
+          if proto == "tcp" {
-
+            ports.tcp_ports.insert(number);
-                    let proto = String::from(raw_proto.as_str());
+          } else {
-                    let number = String::from(raw_port.as_str()).parse::<u16>()?;
+            ports.udp_ports.insert(number);
-
+          }
-                    if proto == "tcp" {
+        } else {
-                        ports.tcp_ports.insert(number);
+          error!("Unexpected rule found in DIPLONAT chain")
-                    } else {
-                        ports.udp_ports.insert(number);
-                    }
-
-                } else {
-                    error!("Unexpected rule found in DIPLONAT chain")
-                }
-
-            },
-            _ => {}
         }
+      }
+      _ => {}
     }
+  }
 
-    Ok(ports)
+  Ok(ports)
 }
 
 pub fn cleanup(ipt: &iptables::IPTables) -> Result<()> {
+  if ipt.chain_exists("filter", "DIPLONAT")? {
+    ipt
+      .flush_chain("filter", "DIPLONAT")
+      .context("Failed to flush the DIPLONAT chain")?;
 
-    if ipt.chain_exists("filter", "DIPLONAT")? {
+    if ipt.exists("filter", "INPUT", "-j DIPLONAT")? {
-        ipt.flush_chain("filter", "DIPLONAT").context("Failed to flush the DIPLONAT chain")?;
+      ipt
-    
+        .delete("filter", "INPUT", "-j DIPLONAT")
-        if ipt.exists("filter", "INPUT", "-j DIPLONAT")? {
+        .context("Failed to delete jump rule")?;
-            ipt.delete("filter", "INPUT", "-j DIPLONAT").context("Failed to delete jump rule")?;
-        }
-    
-        ipt.delete_chain("filter", "DIPLONAT").context("Failed to delete chain")?;
     }
 
-    Ok(())
+    ipt
-}
+      .delete_chain("filter", "DIPLONAT")
+      .context("Failed to delete chain")?;
+  }
 
+  Ok(())
+}

src/fw_actor.rs

@@ -1,27 +1,28 @@
 use anyhow::Result;
+use log::*;
 use tokio::{
   select,
   sync::watch,
-  time::{
+  time::{self, Duration},
-    self, 
+};
-    Duration
-}};
-use log::*;
 
-use iptables;
-use crate::messages;
 use crate::fw;
+use crate::messages;
+use iptables;
 use std::collections::HashSet;
 
 pub struct FirewallActor {
   pub ipt: iptables::IPTables,
   rx_ports: watch::Receiver<messages::PublicExposedPorts>,
   last_ports: messages::PublicExposedPorts,
-  refresh: Duration
+  refresh: Duration,
 }
 
 impl FirewallActor {
-  pub async fn new(_refresh: Duration, rxp: &watch::Receiver<messages::PublicExposedPorts>) -> Result<Self> {
+  pub async fn new(
+    _refresh: Duration,
+    rxp: &watch::Receiver<messages::PublicExposedPorts>,
+  ) -> Result<Self> {
     let ctx = Self {
       ipt: iptables::new(false)?,
       rx_ports: rxp.clone(),
@@ -45,7 +46,9 @@ impl FirewallActor {
       };
 
       // 2. Update last ports if needed
-      if let Some(p) = new_ports { self.last_ports = p; }
+      if let Some(p) = new_ports {
+        self.last_ports = p;
+      }
 
       // 3. Update firewall rules
       match self.do_fw_update().await {
@@ -58,18 +61,26 @@ impl FirewallActor {
   pub async fn do_fw_update(&self) -> Result<()> {
     let curr_opened_ports = fw::get_opened_ports(&self.ipt)?;
 
-    let diff_tcp = self.last_ports.tcp_ports.difference(&curr_opened_ports.tcp_ports).copied().collect::<HashSet<u16>>();
+    let diff_tcp = self
-    let diff_udp = self.last_ports.udp_ports.difference(&curr_opened_ports.udp_ports).copied().collect::<HashSet<u16>>();
+      .last_ports
+      .tcp_ports
+      .difference(&curr_opened_ports.tcp_ports)
+      .copied()
+      .collect::<HashSet<u16>>();
+    let diff_udp = self
+      .last_ports
+      .udp_ports
+      .difference(&curr_opened_ports.udp_ports)
+      .copied()
+      .collect::<HashSet<u16>>();
 
     let ports_to_open = messages::PublicExposedPorts {
-        tcp_ports: diff_tcp,
+      tcp_ports: diff_tcp,
-        udp_ports: diff_udp
+      udp_ports: diff_udp,
     };
 
     fw::open_ports(&self.ipt, ports_to_open)?;
 
     return Ok(());
   }
-
 }
-

src/igd_actor.rs

@@ -1,16 +1,14 @@
+use crate::messages;
+use anyhow::{Context, Result};
 use igd::aio::*;
 use igd::PortMappingProtocol;
-use std::net::SocketAddrV4;
 use log::*;
-use anyhow::{Result, Context};
+use std::net::SocketAddrV4;
 use tokio::{
   select,
   sync::watch,
-  time::{
+  time::{self, Duration},
-    self, 
+};
-    Duration
-}};
-use crate::messages;
 
 pub struct IgdActor {
   last_ports: messages::PublicExposedPorts,
@@ -18,14 +16,19 @@ pub struct IgdActor {
   gateway: Gateway,
   refresh: Duration,
   expire: Duration,
-  private_ip: String
+  private_ip: String,
 }
 
 impl IgdActor {
-  pub async fn new(priv_ip: &str, refresh: Duration, expire: Duration, rxp: &watch::Receiver<messages::PublicExposedPorts>) -> Result<Self> {
+  pub async fn new(
+    priv_ip: &str,
+    refresh: Duration,
+    expire: Duration,
+    rxp: &watch::Receiver<messages::PublicExposedPorts>,
+  ) -> Result<Self> {
     let gw = search_gateway(Default::default())
-              .await
+      .await
-              .context("Failed to find IGD gateway")?;
+      .context("Failed to find IGD gateway")?;
     info!("IGD gateway: {}", gw);
 
     let ctx = Self {
@@ -34,7 +37,7 @@ impl IgdActor {
       private_ip: priv_ip.to_string(),
       refresh: refresh,
       expire: expire,
-      last_ports: messages::PublicExposedPorts::new()
+      last_ports: messages::PublicExposedPorts::new(),
     };
 
     return Ok(ctx);
@@ -51,7 +54,9 @@ impl IgdActor {
       };
 
       // 2. Update last ports if needed
-      if let Some(p) = new_ports { self.last_ports = p; }
+      if let Some(p) = new_ports {
+        self.last_ports = p;
+      }
 
       // 3. Flush IGD requests
       match self.do_igd().await {
@@ -64,14 +69,25 @@ impl IgdActor {
   pub async fn do_igd(&self) -> Result<()> {
     let actions = [
       (PortMappingProtocol::TCP, &self.last_ports.tcp_ports),
-      (PortMappingProtocol::UDP, &self.last_ports.udp_ports)
+      (PortMappingProtocol::UDP, &self.last_ports.udp_ports),
     ];
 
     for (proto, list) in actions.iter() {
       for port in *list {
         let service_str = format!("{}:{}", self.private_ip, port);
-        let service  = service_str.parse::<SocketAddrV4>().context("Invalid socket address")?;
+        let service = service_str
-        self.gateway.add_port(*proto, *port, service, self.expire.as_secs() as u32, "diplonat").await?;
+          .parse::<SocketAddrV4>()
+          .context("Invalid socket address")?;
+        self
+          .gateway
+          .add_port(
+            *proto,
+            *port,
+            service,
+            self.expire.as_secs() as u32,
+            "diplonat",
+          )
+          .await?;
         debug!("IGD request successful for {:#?} {}", proto, service);
       }
     }

src/main.rs

@@ -7,8 +7,8 @@ mod fw_actor;
 mod igd_actor;
 mod messages;
 
-use log::*;
 use diplonat::Diplonat;
+use log::*;
 
 #[tokio::main]
 async fn main() {

src/messages.rs

@@ -3,14 +3,14 @@ use std::collections::HashSet;
 #[derive(Debug, Clone, PartialEq, Eq)]
 pub struct PublicExposedPorts {
   pub tcp_ports: HashSet<u16>,
-  pub udp_ports: HashSet<u16>
+  pub udp_ports: HashSet<u16>,
 }
 
 impl PublicExposedPorts {
   pub fn new() -> Self {
     return Self {
       tcp_ports: HashSet::new(),
-      udp_ports: HashSet::new()
+      udp_ports: HashSet::new(),
-    }
+    };
   }
 }