feat: print the final configuration to console

When the application starts, it only prints the loaded configuration when it's loaded from an env var. It's very helpful to print the final configuration after merging all sources with Figment.

default values -> merge with TOML file -> merge with env vars -> final configuration

It's printed in JSON format.

src/app.rs

@@ -2,6 +2,7 @@ use std::net::SocketAddr;
 use std::sync::Arc;
 
 use tokio::task::JoinHandle;
+use tracing::info;
 
 use crate::bootstrap::logging;
 use crate::cache::image::manager::ImageCacheService;
@@ -42,6 +43,8 @@ pub async fn run(configuration: Configuration, api_version: &Version) -> Running
 
     logging::setup(&log_level);
 
+    log_configuration(&configuration).await;
+
     let configuration = Arc::new(configuration);
 
     // Get configuration settings needed to build the app dependencies and
@@ -190,3 +193,9 @@ pub async fn run(configuration: Configuration, api_version: &Version) -> Running
         tracker_data_importer_handle: tracker_statistics_importer_handle,
     }
 }
+
+async fn log_configuration(configuration: &Configuration) {
+    let mut setting = configuration.get_all().await.clone();
+    setting.remove_secrets();
+    info!("Configuration:\n{}", setting.to_json());
+}

src/config/mod.rs

@@ -141,17 +141,17 @@ impl Info {
         let env_var_config_toml_path = ENV_VAR_CONFIG_TOML_PATH.to_string();
 
         let config_toml = if let Ok(config_toml) = env::var(env_var_config_toml) {
-            println!("Loading configuration from environment variable {config_toml} ...");
+            println!("Loading extra configuration from environment variable {config_toml} ...");
             Some(config_toml)
         } else {
             None
         };
 
         let config_toml_path = if let Ok(config_toml_path) = env::var(env_var_config_toml_path) {
-            println!("Loading configuration from file: `{config_toml_path}` ...");
+            println!("Loading extra configuration from file: `{config_toml_path}` ...");
             config_toml_path
         } else {
-            println!("Loading configuration from default configuration file: `{default_config_toml_path}` ...");
+            println!("Loading extra configuration from default configuration file: `{default_config_toml_path}` ...");
             default_config_toml_path
         };
 

src/config/v2/mod.rs

@@ -81,6 +81,26 @@ impl Settings {
         "***".clone_into(&mut self.mail.smtp.credentials.password);
         self.auth.secret_key = SecretKey::new("***");
     }
+
+    /// Encodes the configuration to TOML.
+    ///
+    /// # Panics
+    ///
+    /// Will panic if it can't be converted to TOML.
+    #[must_use]
+    pub fn to_toml(&self) -> String {
+        toml::to_string(self).expect("Could not encode TOML value")
+    }
+
+    /// Encodes the configuration to JSON.
+    ///
+    /// # Panics
+    ///
+    /// Will panic if it can't be converted to JSON.
+    #[must_use]
+    pub fn to_json(&self) -> String {
+        serde_json::to_string_pretty(self).expect("Could not encode JSON value")
+    }
 }
 
 impl Validator for Settings {