Add configurable logging system

Cargo.toml

@@ -75,6 +75,7 @@ libc = "0.2"
 uniffi = { version = "0.27.3", features = ["build"], optional = true }
 serde = { version = "1.0.210", default-features = false, features = ["std", "derive"] }
 serde_json = { version = "1.0.128", default-features = false, features = ["std"] }
+log = { version = "0.4.22", default-features = false, features = ["std"]}
 
 vss-client = "0.3"
 prost = { version = "0.11.6", default-features = false}

bindings/kotlin/ldk-node-android/lib/src/androidTest/kotlin/org/lightningdevkit/ldknode/AndroidLibTest.kt

@@ -6,6 +6,7 @@ package org.lightningdevkit.ldknode
 import kotlin.UInt
 import kotlin.test.Test
 import kotlin.test.assertEquals
+import kotlin.test.assertTrue   
 import kotlin.io.path.createTempDirectory
 import org.junit.runner.RunWith
 import org.lightningdevkit.ldknode.*;
@@ -16,6 +17,9 @@ import androidx.test.ext.junit.runners.AndroidJUnit4
 @RunWith(AndroidJUnit4::class)
 class AndroidLibTest {
     @Test fun node_start_stop() {
+        val logWriter1 = CustomLogWriter(CustomLogWriter.LogLevel.GOSSIP)
+        val logWriter2 = CustomLogWriter(CustomLogWriter.LogLevel.GOSSIP)
+
         val tmpDir1 = createTempDirectory("ldk_node").toString()
         println("Random dir 1: $tmpDir1")
         val tmpDir2 = createTempDirectory("ldk_node").toString()
@@ -28,17 +32,18 @@ class AndroidLibTest {
         config1.storageDirPath = tmpDir1
         config1.listeningAddresses = listOf(listenAddress1)
         config1.network = Network.REGTEST
-        config1.logLevel = LogLevel.TRACE
 
         val config2 = defaultConfig()
         config2.storageDirPath = tmpDir2
         config2.listeningAddresses = listOf(listenAddress2)
         config2.network = Network.REGTEST
-        config2.logLevel = LogLevel.TRACE
 
         val builder1 = Builder.fromConfig(config1)
         val builder2 = Builder.fromConfig(config2)
 
+        builder1.set_custom_logger(logWriter1)
+        builder2.set_custom_logger(logWriter2)
+
         val node1 = builder1.build()
         val node2 = builder2.build()
 
@@ -57,7 +62,55 @@ class AndroidLibTest {
         val address2 = node2.onchain_payment().newOnchainAddress()
         println("Funding address 2: $address2")
 
+        assertTrue(logWriter1.getLogMessages().isNotEmpty())
+        assertTrue(logWriter2.getLogMessages().isNotEmpty())
+
         node1.stop()
         node2.stop()
     }
 }
+
+class CustomLogWriter(private var currentLogLevel: LogLevel = LogLevel.INFO): LogWriter {
+    enum class LogLevel {
+        ERROR, WARN, INFO, DEBUG, TRACE, GOSSIP
+    }
+
+    private val logMessages = mutableListOf<String>()
+
+    fun setLogLevel(level: LogLevel) {
+        currentLogLevel = level
+    }
+
+    override fun log(record: LogRecord) {
+        val recordLevel = when(record.level.toLowerCase()) {
+            "error" -> LogLevel.ERROR
+            "warn" -> LogLevel.WARN
+            "info" -> LogLevel.INFO
+            "debug" -> LogLevel.DEBUG
+            "trace" -> LogLevel.TRACE
+            "gossip" -> LogLevel.GOSSIP
+            else -> LogLevel.INFO
+        }
+
+        if (isLevelEnabled(recordLevel)) {
+            val log_message = formatRecord(record)
+            logMessages.add(log_message)
+        }
+    }
+
+    private fun formatRecord(record: LogRecord): String {
+        val timestamp = java.time.LocalDateTime.now().format(java.time.format.DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss"))
+        return String.format(
+            "%s %-5s [%s:%d] %s\n",
+            timestamp,
+            record.level,
+            record.modulePath,
+            record.line,
+            record.message
+        )
+    }
+
+    private fun isLevelEnabled(level: LogLevel): Boolean {
+        return level.ordinal <= currentLogLevel.ordinal
+    }
+}

bindings/kotlin/ldk-node-jvm/lib/src/test/kotlin/org/lightningdevkit/ldknode/LibraryTest.kt

@@ -118,15 +118,13 @@ class LibraryTest {
         config1.storageDirPath = tmpDir1
         config1.listeningAddresses = listOf(listenAddress1)
         config1.network = Network.REGTEST
-        config1.logLevel = LogLevel.TRACE
 
         println("Config 1: $config1")
 
         val config2 = defaultConfig()
         config2.storageDirPath = tmpDir2
         config2.listeningAddresses = listOf(listenAddress2)
         config2.network = Network.REGTEST
-        config2.logLevel = LogLevel.TRACE
         println("Config 2: $config2")
 
         val builder1 = Builder.fromConfig(config1)

bindings/ldk_node.udl

@@ -5,13 +5,11 @@ namespace ldk_node {
 
 dictionary Config {
 	string storage_dir_path;
-	string? log_file_path;
 	Network network;
 	sequence<SocketAddress>? listening_addresses;
 	NodeAlias? node_alias;
 	sequence<PublicKey> trusted_peers_0conf;
 	u64 probing_liquidity_limit_multiplier;
-	LogLevel log_level;
 	AnchorChannelsConfig? anchor_channels_config;
 	SendingParameters? sending_parameters;
 };
@@ -27,6 +25,20 @@ dictionary EsploraSyncConfig {
 	u64 fee_rate_cache_update_interval_secs;
 };
 
+enum LogLevel {
+	"Gossip",
+	"Trace",
+	"Debug",
+	"Info",
+	"Warn",
+	"Error",
+};
+
+dictionary FilesystemLoggerConfig {
+	string? log_file_path;
+	LogLevel? log_level;
+};
+
 interface Builder {
 	constructor();
 	[Name=from_config]
@@ -41,6 +53,9 @@ interface Builder {
 	void set_gossip_source_rgs(string rgs_server_url);
 	void set_liquidity_source_lsps2(SocketAddress address, PublicKey node_id, string? token);
 	void set_storage_dir_path(string storage_dir_path);
+	void set_filesystem_logger(FilesystemLoggerConfig fs_config);
+	void set_log_facade_logger(LogLevel log_level);
+	void set_custom_logger(LogWriter log_writer);
 	void set_network(Network network);
 	[Throws=BuildError]
 	void set_listening_addresses(sequence<SocketAddress> listening_addresses);
@@ -514,15 +529,6 @@ interface MaxDustHTLCExposure {
 	FeeRateMultiplier ( u64 multiplier );
 };
 
-enum LogLevel {
-	"Gossip",
-	"Trace",
-	"Debug",
-	"Info",
-	"Warn",
-	"Error",
-};
-
 interface NetworkGraph {
 	sequence<u64> list_channels();
 	ChannelInfo? channel(u64 short_channel_id);
@@ -563,6 +569,18 @@ dictionary NodeAnnouncementInfo {
 	sequence<SocketAddress> addresses;
 };
 
+dictionary LogRecord {
+	LogLevel level;
+	string args;
+	string module_path;
+	u32 line;
+};
+
+[Trait]
+interface LogWriter {
+    void log(LogRecord record);
+};
+
 [Custom]
 typedef string Txid;