Add log when sending BOLT 12 invoice

src/commonMain/kotlin/fr/acinq/lightning/payment/OfferManager.kt

@@ -183,7 +183,10 @@ class OfferManager(val nodeParams: NodeParams, val walletParams: WalletParams, v
                         logger.warning { "offerId:${offer.offerId} pathId:${decrypted.pathId} ignoring invoice request, could not build onion message: ${invoiceMessage.value}" }
                         sendInvoiceError("failed to build onion message", decrypted.content.replyPath)
                     }
-                    is Right -> OnionMessageAction.SendMessage(invoiceMessage.value)
+                    is Right -> {
+                        logger.info { "sending BOLT 12 invoice with amount=${invoice.amount}, paymentHash=${invoice.paymentHash}, payerId=${invoice.invoiceRequest.payerId} to introduction node ${destination.route.introductionNodeId}" }
+                        OnionMessageAction.SendMessage(invoiceMessage.value)
+                    }
                 }
             }
         }

src/commonMain/kotlin/fr/acinq/lightning/wire/LightningMessages.kt

@@ -1587,6 +1587,9 @@ data class OnionMessage(
         OnionRoutingPacketSerializer(onionRoutingPacket.payload.size()).write(onionRoutingPacket, out)
     }
 
+    override fun toString(): String =
+        "OnionMessage(blindingKey=$blindingKey, onionRoutingPacket=OnionRoutingPacket(version=${onionRoutingPacket.version}, publicKey=${onionRoutingPacket.publicKey.toHex()}, payload=<${onionRoutingPacket.payload.size()} bytes>, hmac=${onionRoutingPacket.hmac.toHex()}))"
+
     companion object : LightningMessageReader<OnionMessage> {
         const val type: Long = 513
 

src/commonMain/kotlin/fr/acinq/lightning/wire/OnionRouting.kt

@@ -12,9 +12,9 @@ import fr.acinq.lightning.utils.toByteVector32
 
 data class OnionRoutingPacket(
     val version: Int,
-     val publicKey: ByteVector,
-     val payload: ByteVector,
-     val hmac: ByteVector32
+    val publicKey: ByteVector,
+    val payload: ByteVector,
+    val hmac: ByteVector32
 ) {
     companion object {
         const val PaymentPacketLength = 1300