added method to import errors into client interface KiloClient.Builder#addErrors

src/commonMain/kotlin/net/sergeych/kiloparsec/KiloClient.kt

@@ -112,6 +112,10 @@ class KiloClient<S>(
                 interfaceBuilder = f
             }
 
+            fun addErrors(from: LocalInterface<*>) {
+                errorProviders += from
+            }
+
             /**
              * Create a new session object, otherwise Unit session will be used
              */
@@ -123,8 +127,11 @@ class KiloClient<S>(
                 connectionBuilder = f
             }
 
+            val errorProviders = mutableListOf<LocalInterface<*>>()
+
             internal fun build(): KiloClient<S> {
                 val i = KiloInterface<S>()
+                for(ep in errorProviders) i.addErrorProvider(ep)
                 interfaceBuilder?.let { i.it() }
                 val connector = connectionBuilder ?: throw IllegalArgumentException("connect handler was not set")
                 return KiloClient(i,secretIdKey) {

src/commonMain/kotlin/net/sergeych/kiloparsec/LocalInterface.kt

@@ -11,7 +11,7 @@ private typealias RawCommandHandler<C> = suspend (C, UByteArray) -> UByteArray
 
 private val idCounter = AtomicCounter()
 
-open class LocalInterface<S>: Loggable by LogTag("LocalInterface${idCounter.incrementAndGet()}") {
+open class LocalInterface<S> : Loggable by LogTag("LocalInterface${idCounter.incrementAndGet()}") {
 
     private val commands = mutableMapOf<String, RawCommandHandler<S>>()
 

src/jvmTest/kotlin/net/sergeych/kiloparsec/ClientTest.kt

@@ -13,10 +13,13 @@ import net.sergeych.mp_logger.Log
 import java.net.InetAddress
 import kotlin.test.Test
 import kotlin.test.assertEquals
+import kotlin.test.assertIs
 import kotlin.test.assertTrue
 
 class ClientTest {
 
+    class TestException : Exception("test1")
+
     @Test
     fun testAddresses() {
         println(InetAddress.getLocalHost())
@@ -34,16 +37,30 @@ class ClientTest {
 
         val cmdSave by command<String,Unit>()
         val cmdLoad by command<Unit,String>()
+        val cmdDrop by command<Unit,Unit>()
+        val cmdException by command<Unit,Unit>()
 
         val cli = KiloInterface<Session>().apply {
+            registerError { TestException() }
             onConnected { session.data = "start" }
             on(cmdSave) { session.data = it }
             on(cmdLoad) {
                 println("load!")
-                session.data }
+                session.data
             }
-        val server = KiloServer(cli, acceptTcpDevice(17101)) { Session("unknown")}
+            on(cmdException) {
-        val client = KiloClient<Unit> {
+                throw TestException()
+            }
+            on(cmdDrop) {
+                throw RemoteInterface.ClosedException()
+            }
+        }
+        val server = KiloServer(cli, acceptTcpDevice(17101)) {
+            Session("unknown")
+        }
+
+        val client = KiloClient<Unit>() {
+            addErrors(cli)
             connect { connectTcpDevice("localhost:17101") }
         }
         println(client.call(cmdLoad))
@@ -51,6 +68,13 @@ class ClientTest {
         assertEquals("start", client.call(cmdLoad))
         client.call(cmdSave, "foobar")
         assertEquals("foobar", client.call(cmdLoad))
+
+//    client.call(cmdException)
+        val res = kotlin.runCatching {  client.call(cmdException) }
+        println(res.exceptionOrNull())
+        assertIs<TestException>(res.exceptionOrNull())
+        assertEquals("foobar", client.call(cmdLoad))
+
         server.close()
     }