refactor: settings into modules

apps/nxmesh-agent/src/config/settings/mod.rs

@@ -0,0 +1,77 @@
+use config::{Config, ConfigError, Environment, File};
+use serde::{Deserialize, Serialize};
+
+mod auth;
+mod cors;
+mod grpc;
+mod log;
+mod nginx;
+
+pub use auth::*;
+pub use cors::*;
+pub use grpc::*;
+pub use log::*;
+pub use nginx::*;
+
+pub type ValidationError = String;
+
+pub trait Validate {
+    fn validate(&self) -> Result<(), ValidationError>;
+}
+
+/// Agent settings
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct Settings {
+    pub grpc: GrpcSettings,
+    #[serde(default)]
+    pub log: LogSettings,
+    pub nginx: Option<NginxSettings>,
+}
+
+impl Validate for Settings {
+    fn validate(&self) -> Result<(), ValidationError> {
+        self.grpc.validate()?;
+        if let Some(nginx) = &self.nginx {
+            nginx.validate()?;
+        }
+        Ok(())
+    }
+}
+
+impl Settings {
+    /// Load settings from config files and environment
+    pub fn load() -> Result<Self, ConfigError> {
+        let run_mode = std::env::var("RUN_MODE").unwrap_or_else(|_| "development".into());
+
+        let settings = Config::builder()
+            .add_source(File::with_name("config/default").required(false))
+            .add_source(File::with_name(&format!("config/{}", run_mode)).required(false))
+            .add_source(File::with_name("config/agent/default").required(false))
+            .add_source(File::with_name(&format!("config/agent/{}", run_mode)).required(false))
+            .add_source(Environment::with_prefix("NXMESH").separator("__"))
+            .build()?;
+
+        let mut settings: Self = settings.try_deserialize()?;
+
+        settings.validate().map_err(ConfigError::Message)?;
+
+        if let Some(nginx) = &mut settings.nginx {
+            nginx.validate().map_err(ConfigError::Message)?;
+            nginx.transform_commands();
+        }
+
+        Ok(settings)
+    }
+}
+
+#[cfg(test)]
+mod tests {
+
+    use super::*;
+
+    #[test]
+    fn test_ensure_send_and_sync() {
+        fn assert_send_sync<T: Send + Sync>() {}
+        assert_send_sync::<Settings>();
+    }
+}