refactor: simplify Debug trait implementations for LogWriterConfig

- Add a custom Debug implementation for LogWriterConfig to work around NodeBuilder's
  Debug constraints.
- Remove the Debug trait from LogWriter, as it is no longer needed due to the custom Debug
   impl on LogWriterConfig.
- Remove the Debug implementation from Writer for consistency.

Author: enigbe

src/builder.rs

@@ -109,13 +109,25 @@ impl Default for LiquiditySourceConfig {
 	}
 }
 
-#[derive(Debug, Clone)]
+#[derive(Clone)]
 enum LogWriterConfig {
 	File(FilesystemLoggerConfig),
 	Log(LogLevel),
 	Custom(Arc<dyn LogWriter + Send + Sync>),
 }
 
+impl std::fmt::Debug for LogWriterConfig {
+	fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+		match self {
+			LogWriterConfig::File(config) => f.debug_tuple("File").field(config).finish(),
+			LogWriterConfig::Log(level) => f.debug_tuple("Log").field(level).finish(),
+			LogWriterConfig::Custom(_) => {
+				f.debug_tuple("Custom").field(&"<config internal to custom log writer>").finish()
+			},
+		}
+	}
+}
+
 impl Default for LogWriterConfig {
 	fn default() -> Self {
 		Self::File(FilesystemLoggerConfig::default())

src/logger.rs

@@ -17,7 +17,6 @@ use log::{debug, error, info, trace, warn};
 
 #[cfg(not(feature = "uniffi"))]
 use core::fmt;
-use std::fmt::Debug;
 use std::fs;
 use std::io::Write;
 use std::path::Path;
@@ -79,7 +78,7 @@ impl<'a> From<Record<'a>> for LogRecord<'a> {
 /// which may involve formatting, filtering, and forwarding them to specific
 /// outputs.
 #[cfg(not(feature = "uniffi"))]
-pub trait LogWriter: Send + Sync + Debug {
+pub trait LogWriter: Send + Sync {
 	/// Log the record.
 	fn log<'a>(&self, record: LogRecord<'a>);
 }
@@ -90,13 +89,12 @@ pub trait LogWriter: Send + Sync + Debug {
 /// It is similar to the non-`uniffi` version, but it omits the lifetime parameter
 /// for the `LogRecord`, as the Uniffi-exposed interface cannot handle lifetimes.
 #[cfg(feature = "uniffi")]
-pub trait LogWriter: Send + Sync + Debug {
+pub trait LogWriter: Send + Sync {
 	/// Log the record.
 	fn log(&self, record: LogRecord);
 }
 
 /// Defines a writer for [`Logger`].
-#[derive(Debug)]
 pub(crate) enum Writer {
 	/// Writes logs to the file system.
 	FileWriter { file_path: String, level: LogLevel },

tests/common/mod.rs

@@ -260,7 +260,6 @@ pub(crate) enum TestLogWriter {
 }
 
 /// Simple in-memory mock `log` logger for tests.
-#[derive(Debug)]
 pub(crate) struct MockLogger {
 	logs: Arc<Mutex<Vec<String>>>,
 }
@@ -297,10 +296,6 @@ impl Log for MockLogger {
 	fn flush(&self) {}
 }
 
-/// [`MockLogger`] as custom logger - a destination for [`Writer::CustomWriter`]
-/// to write logs to.
-///
-/// [`Writer::CustomWriter`]: ldk_node::logger::Writer::CustomWriter
 impl LogWriter for MockLogger {
 	fn log(&self, record: LogRecord) {
 		let message = format!(