server: default lndk conf in lndk dir

LNDK is already using a datadir to store TLS certificates.
In this PR we default LNDK config and data to ~/.lndk.
Datadir is moved inside the default dir ~/.lndk/data. Then,
we expect lndk.conf file to be iether in root of the project,
or the default LNDK config folder or --config flag.
Precedence is flag > root > default dir.

config_spec.toml

@@ -40,7 +40,7 @@ doc = "The hex encoded macaroon to pass directly into LNDK"
 [[param]]
 name = "data_dir"
 type = "String"
-doc = "The path to the lndk data directory. By default this is stored in ~/.lndk"
+doc = "The path to the lndk data directory. By default this is stored in ~/.lndk/data"
 
 [[param]]
 name = "log_file"

src/lib.rs

@@ -62,8 +62,10 @@ pub fn init_logger(config: LogConfig) {
 pub const DEFAULT_SERVER_HOST: &str = "127.0.0.1";
 pub const DEFAULT_SERVER_PORT: u16 = 7000;
 pub const LDK_LOGGER_NAME: &str = "ldk";
-pub const DEFAULT_DATA_DIR: &str = ".lndk";
+pub const DEFAULT_DATA_DIR: &str = "data";
+pub const DEFAULT_LNDK_DIR: &str = ".lndk";
 pub const DEFAULT_LOG_FILE: &str = "lndk.log";
+pub const DEFAULT_CONFIG_FILE_NAME: &str = "lndk.conf";
 
 pub const TLS_CERT_FILENAME: &str = "tls-cert.pem";
 pub const TLS_KEY_FILENAME: &str = "tls-key.pem";

src/main.rs

@@ -15,12 +15,14 @@ use lndk::lnd::{get_lnd_client, validate_lnd_creds, LndCfg};
 use lndk::server::{generate_tls_creds, read_tls, LNDKServer};
 use lndk::{
     lndkrpc, setup_logger, Cfg, LifecycleSignals, LndkOnionMessenger, OfferHandler,
-    DEFAULT_DATA_DIR, DEFAULT_LOG_FILE, DEFAULT_SERVER_HOST, DEFAULT_SERVER_PORT,
+    DEFAULT_CONFIG_FILE_NAME, DEFAULT_DATA_DIR, DEFAULT_LNDK_DIR, DEFAULT_LOG_FILE,
+    DEFAULT_SERVER_HOST, DEFAULT_SERVER_PORT,
 };
 use lndkrpc::offers_server::OffersServer;
 use log::{error, info};
+use std::ffi::OsString;
 use std::fs::create_dir_all;
-use std::path::PathBuf;
+use std::path::{Path, PathBuf};
 use std::process::exit;
 use std::sync::Arc;
 use tokio::select;
@@ -33,13 +35,13 @@ extern crate configure_me;
 
 #[tokio::main]
 async fn main() -> Result<(), ()> {
-    let config = Config::including_optional_config_files(&["./lndk.conf"])
+    let paths = get_conf_file_paths();
+    let config = Config::including_optional_config_files(paths)
         .unwrap_or_exit()
         .0;
-
-    let data_dir = create_data_dir(&config.data_dir)
-        .map_err(|e| println!("Error creating LNDK's data dir {e:?}"))?;
-
+    let data_dir = create_data_dir(&config.data_dir).map_err(|e| {
+        println!("Error creating LNDK's data dir: {:?}", e);
+    })?;
     let log_file = config.log_file.map(PathBuf::from).or(config
         .data_dir
         .map(|data_dir| PathBuf::from(data_dir).join(DEFAULT_LOG_FILE)));
@@ -161,14 +163,31 @@ async fn main() -> Result<(), ()> {
     Ok(())
 }
 
-// Creates lndk's data directory at the specified directory, or ~/.lndk if not specified.
+// Creates lndk's data directory at the specified directory, or ~/.lndk/data if not specified.
+// Process must have write access to the directory.
 fn create_data_dir(data_dir: &Option<String>) -> Result<PathBuf, std::io::Error> {
     let path = match data_dir {
         Some(dir) => PathBuf::from(&dir),
-        None => home_dir().unwrap().join(DEFAULT_DATA_DIR),
+        None => get_default_lnkd_dir_path().join(DEFAULT_DATA_DIR),
     };
 
     create_dir_all(&path)?;
 
     Ok(path)
 }
+
+fn get_default_lnkd_dir_path() -> PathBuf {
+    home_dir().unwrap().join(DEFAULT_LNDK_DIR)
+}
+
+fn get_conf_file_paths() -> Vec<OsString> {
+    let default_lndk_config_path = get_default_lnkd_dir_path()
+        .join(DEFAULT_CONFIG_FILE_NAME)
+        .into_os_string();
+    let current_dir_conf_file = Path::new("./")
+        .join(DEFAULT_CONFIG_FILE_NAME)
+        .into_os_string();
+
+    let paths = vec![current_dir_conf_file, default_lndk_config_path];
+    paths
+}