feat: additional JS logging to file

Author: Jasonvdb

lib/ios/Classes/LdkLogger.swift

@@ -21,7 +21,32 @@ class LdkLogger: Logger {
         //Only when the JS code has set the log level to active
         if activeLevels[level] == true {
             LdkEventEmitter.shared.send(withEvent: .ldk_log, body: record.get_args())
-            Logfile.log.write(record.get_args())
+            
+            var levelStr = ""
+            switch level {
+            case 0:
+                levelStr = "GOSSIP"
+                break
+            case 1:
+                levelStr = "TRACE"
+                break
+            case 2:
+                levelStr = "DEBUG"
+                break
+            case 3:
+                levelStr = "INFO"
+                break
+            case 4:
+                levelStr = "WARN"
+                break
+            case 5:
+                levelStr = "ERROR"
+                break
+            default:
+                levelStr = "LEVEL \(level)"
+            }
+                        
+            Logfile.log.write("\(levelStr) (LDK): \(record.get_args())")
         }
     }
 

lib/ios/Helpers.swift

@@ -9,7 +9,9 @@ import Foundation
 import LightningDevKit
 
 func handleResolve(_ resolve: RCTPromiseResolveBlock, _ res: LdkCallbackResponses) {
-    LdkEventEmitter.shared.send(withEvent: .native_log, body: "Success: \(res.rawValue)")
+    if res != .log_write_success {
+        LdkEventEmitter.shared.send(withEvent: .native_log, body: "Success: \(res.rawValue)")
+    }
     resolve(res.rawValue)
 }
 

lib/ios/Ldk.m

@@ -10,6 +10,9 @@ @interface RCT_EXTERN_MODULE(Ldk, NSObject)
 RCT_EXTERN_METHOD(setLogFilePath:(NSString *)path
                   resolve:(RCTPromiseResolveBlock)resolve
                   reject:(RCTPromiseRejectBlock)reject)
+RCT_EXTERN_METHOD(writeToLogFile:(NSString *)line
+                  resolve:(RCTPromiseResolveBlock)resolve
+                  reject:(RCTPromiseRejectBlock)reject)
 RCT_EXTERN_METHOD(initChainMonitor:(RCTPromiseResolveBlock)resolve
                   reject:(RCTPromiseRejectBlock)reject)
 RCT_EXTERN_METHOD(initKeysManager:(NSString *)seed

lib/ios/Ldk.swift

@@ -71,6 +71,7 @@ enum LdkCallbackResponses: String {
     case fees_updated = "fees_updated"
     case log_level_updated = "log_level_updated"
     case log_path_updated = "log_path_updated"
+    case log_write_success = "log_write_success"
     case chain_monitor_init_success = "chain_monitor_init_success"
     case keys_manager_init_success = "keys_manager_init_success"
     case channel_manager_init_success = "channel_manager_init_success"
@@ -174,6 +175,12 @@ class Ldk: NSObject {
         return handleResolve(resolve, .log_path_updated)
     }
 
+    @objc
+    func writeToLogFile(_ line: NSString, resolve: @escaping RCTPromiseResolveBlock, reject: @escaping RCTPromiseRejectBlock) {
+        Logfile.log.write(String(line))
+        return handleResolve(resolve, .log_write_success)
+    }
+    
     @objc
     func initChainMonitor(_ resolve: @escaping RCTPromiseResolveBlock, reject: @escaping RCTPromiseRejectBlock) {
         guard chainMonitor == nil else {