Merge pull request 'Environment parsing done with Serde Envy' (#5) from adrien/diplonat:feature/config-handling into main

Reviewed-on: https://git.deuxfleurs.fr/Deuxfleurs/diplonat/pulls/5

1 files changed, 121 insertions, 0 deletions

diff --git a/src/config/runtime.rs b/src/config/runtime.rs
new file mode 100644
index 0000000..58c86b9
--- /dev/null
+++ b/src/config/runtime.rs
@@ -0,0 +1,121 @@
+use std::time::Duration;
+
+use anyhow::{Result, anyhow};
+
+use crate::config::{ConfigOpts, ConfigOptsAcme, ConfigOptsBase, ConfigOptsConsul};
+
+// This code is inspired by the Trunk crate (https://github.com/thedodd/trunk)
+
+// In this file, we take ConfigOpts and transform them into ready-to-use RuntimeConfig.
+// We apply default values and business logic.
+
+#[derive(Debug)]
+pub struct RuntimeConfigAcme {
+	pub email: String,
+}
+
+#[derive(Debug)]
+pub struct RuntimeConfigConsul {
+	pub node_name: String,
+	pub url: String,
+}
+
+#[derive(Debug)]
+pub struct RuntimeConfigFirewall {
+	pub refresh_time: Duration,
+}
+
+#[derive(Debug)]
+pub struct RuntimeConfigIgd {
+	pub private_ip: String,
+	pub expiration_time: Duration,
+	pub refresh_time: Duration,
+}
+
+#[derive(Debug)]
+pub struct RuntimeConfig {
+	pub acme: Option<RuntimeConfigAcme>,
+	pub consul: RuntimeConfigConsul,
+	pub firewall: RuntimeConfigFirewall,
+	pub igd: RuntimeConfigIgd,
+}
+
+impl RuntimeConfig {
+	pub fn new(opts: ConfigOpts) -> Result<Self> {
+		let acme = RuntimeConfigAcme::new(opts.acme.clone())?;
+		let consul = RuntimeConfigConsul::new(opts.consul.clone())?;
+		let firewall = RuntimeConfigFirewall::new(opts.base.clone())?;
+		let igd = RuntimeConfigIgd::new(opts.base.clone())?;
+
+		Ok(Self {
+			acme,
+			consul,
+			firewall,
+			igd,
+		})
+	}
+}
+
+impl RuntimeConfigAcme {
+	pub fn new(opts: ConfigOptsAcme) -> Result<Option<Self>> {
+		if !opts.enable {
+			return Ok(None);
+		}
+
+		let email = opts.email.expect(
+			"'DIPLONAT_ACME_EMAIL' environment variable is required \
+			if 'DIPLONAT_ACME_ENABLE' == 'true'");
+
+		Ok(Some(Self {
+			email,
+		}))
+	}
+}
+
+impl RuntimeConfigConsul {
+	pub(super) fn new(opts: ConfigOptsConsul) -> Result<Self> {
+		let node_name = opts.node_name.expect(
+			"'DIPLONAT_CONSUL_NODE_NAME' environment variable is required");
+		let url = opts.url.unwrap_or(super::CONSUL_URL.to_string());
+
+		Ok(Self {
+			node_name,
+			url,
+		})
+	}
+}
+
+impl RuntimeConfigFirewall {
+	pub(super) fn new(opts: ConfigOptsBase) -> Result<Self> {
+		let refresh_time = Duration::from_secs(
+				opts.refresh_time.unwrap_or(super::REFRESH_TIME).into());
+
+		Ok(Self {
+			refresh_time,
+		})
+	}
+}
+
+impl RuntimeConfigIgd {
+	pub(super) fn new(opts: ConfigOptsBase) -> Result<Self> {
+		let private_ip = opts.private_ip.expect(
+			"'DIPLONAT_PRIVATE_IP' environment variable is required");
+		let expiration_time = Duration::from_secs(
+				opts.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() {
+	      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 {
+			private_ip,
+			expiration_time,
+			refresh_time,
+		})
+	}
+}
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