cap. lifecycle fixes + more test cases

Capnp.Net.Runtime.Tests/Dtbdct.cs

@@ -98,5 +98,23 @@ namespace Capnp.Net.Runtime.Tests
         {
             NewDtbdctTestbed().RunTest(Testsuite.BootstrapReuse);
         }
+
+        [TestMethod]
+        public void Ownership1()
+        {
+            NewDtbdctTestbed().RunTest(Testsuite.Ownership1);
+        }
+
+        [TestMethod]
+        public void Ownership2()
+        {
+            NewDtbdctTestbed().RunTest(Testsuite.Ownership2);
+        }
+
+        [TestMethod]
+        public void Ownership3()
+        {
+            NewDtbdctTestbed().RunTest(Testsuite.Ownership3);
+        }
     }
 }

Capnp.Net.Runtime.Tests/LocalRpc.cs

@@ -12,6 +12,7 @@ using System.Threading.Tasks;
 namespace Capnp.Net.Runtime.Tests
 {
     [TestClass]
+    [TestCategory("Coverage")]
     public class LocalRpc: TestBase
     {
         [TestMethod]
@@ -113,5 +114,23 @@ namespace Capnp.Net.Runtime.Tests
         {
             NewLocalTestbed().RunTest(Testsuite.Basic);
         }
+
+        [TestMethod]
+        public void Ownership1()
+        {
+            NewLocalTestbed().RunTest(Testsuite.Ownership1);
+        }
+
+        [TestMethod]
+        public void Ownership2()
+        {
+            NewLocalTestbed().RunTest(Testsuite.Ownership2);
+        }
+
+        [TestMethod]
+        public void Ownership3()
+        {
+            NewLocalTestbed().RunTest(Testsuite.Ownership3);
+        }
     }
 }

Capnp.Net.Runtime.Tests/TcpRpcErrorHandling.cs

@@ -15,6 +15,7 @@ using System.Threading.Tasks;
 namespace Capnp.Net.Runtime.Tests
 {
     [TestClass]
+    [TestCategory("Coverage")]
     public class TcpRpcErrorHandling: TestBase
     {
         class MemStreamEndpoint : IEndpoint

Capnp.Net.Runtime.Tests/TcpRpcPorted.cs

@@ -166,5 +166,23 @@ namespace Capnp.Net.Runtime.Tests
 
             Assert.IsTrue(impl.IsDisposed);
         }
+
+        [TestMethod]
+        public void Ownership1()
+        {
+            NewLocalhostTcpTestbed().RunTest(Testsuite.Ownership1);
+        }
+
+        [TestMethod]
+        public void Ownership2()
+        {
+            NewLocalhostTcpTestbed().RunTest(Testsuite.Ownership2);
+        }
+
+        [TestMethod]
+        public void Ownership3()
+        {
+            NewLocalhostTcpTestbed().RunTest(Testsuite.Ownership3);
+        }
     }
 }

Capnp.Net.Runtime.Tests/Testsuite.cs

@@ -532,5 +532,43 @@ namespace Capnp.Net.Runtime.Tests
                 Assert.IsFalse(impl.IsDisposed);
             }
         }
+
+        public static void Ownership1(ITestbed testbed)
+        {
+            var impl = new TestMoreStuffImpl(new Counters());
+            using (var main = testbed.ConnectMain<ITestMoreStuff>(impl))
+            {
+                var tcs = new TaskCompletionSource<int>();
+                var ti = new TestInterfaceImpl(new Counters(), tcs);
+                testbed.MustComplete(main.CallFoo(ti, default));
+                testbed.MustComplete(tcs.Task);
+            }
+        }
+
+        public static void Ownership2(ITestbed testbed)
+        {
+            var impl = new TestMoreStuffImpl(new Counters());
+            using (var main = testbed.ConnectMain<ITestMoreStuff>(impl))
+            using (var nullProxy = main.GetNull().Eager(true))
+            {
+                var tcs = new TaskCompletionSource<int>();
+                var ti = new TestInterfaceImpl(new Counters(), tcs);
+                testbed.MustComplete(nullProxy.CallFoo(ti, default));
+                testbed.MustComplete(tcs.Task);
+            }
+        }
+
+        public static void Ownership3(ITestbed testbed)
+        {
+            var impl = new TestMoreStuffImpl(new Counters());
+            using (var main = testbed.ConnectMain<ITestMoreStuff>(impl))
+            using (var nullProxy = main.GetNull(new CancellationToken(true)).Eager(true))
+            {
+                var tcs = new TaskCompletionSource<int>();
+                var ti = new TestInterfaceImpl(new Counters(), tcs);
+                testbed.MustComplete(nullProxy.CallFoo(ti, default));
+                testbed.MustComplete(tcs.Task);
+            }
+        }
     }
 }

Capnp.Net.Runtime.Tests/Util/TestBase.cs

@@ -167,12 +167,12 @@ namespace Capnp.Net.Runtime.Tests
 
             void ITestbed.MustComplete(params Task[] tasks)
             {
-                Assert.IsTrue(Task.WhenAll(tasks).IsCompleted);
+                Assert.IsTrue(tasks.All(t => t.IsCompleted));
             }
 
             void ITestbed.MustNotComplete(params Task[] tasks)
             {
-                Assert.IsFalse(Task.WhenAny(tasks).IsCompleted);
+                Assert.IsFalse(tasks.Any(t => t.IsCompleted));
             }
         }
 
@@ -248,14 +248,30 @@ namespace Capnp.Net.Runtime.Tests
                 return _client.GetMain<T>();
             }
 
+            static Task[] GulpExceptions(Task[] tasks)
+            {
+                async Task Gulp(Task t)
+                {
+                    try
+                    {
+                        await t;
+                    }
+                    catch
+                    {
+                    }
+                }
+
+                return tasks.Select(Gulp).ToArray();
+            }
+
             void ITestbed.MustComplete(params Task[] tasks)
             {
-                Assert.IsTrue(Task.WaitAll(tasks, MediumNonDbgTimeout));
+                Assert.IsTrue(Task.WaitAll(GulpExceptions(tasks), MediumNonDbgTimeout));
             }
 
             void ITestbed.MustNotComplete(params Task[] tasks)
             {
-                Assert.AreEqual(-1, Task.WaitAny(tasks, ShortTimeout));
+                Assert.AreEqual(-1, Task.WaitAny(GulpExceptions(tasks), ShortTimeout));
             }
 
             void ITestbed.FlushCommunication()

Capnp.Net.Runtime/DeserializerState.cs

@@ -45,6 +45,7 @@ namespace Capnp
         /// The kind of object this state currently represents.
         /// </summary>
         public ObjectKind Kind { get; set; }
+        bool _disposed;
         /// <summary>
         /// The capabilities imported from the capability table. Only valid in RPC context.
         /// </summary>
@@ -65,6 +66,7 @@ namespace Capnp
             StructPtrCount = 1;
             Kind = ObjectKind.Struct;
             Caps = null;
+            _disposed = false;
         }
 
         /// <summary>
@@ -685,12 +687,14 @@ namespace Capnp
 
         public void Dispose()
         {
-            if (Caps != null)
+            if (Caps != null && !_disposed)
             {
                 foreach (var cap in Caps)
                 {
                     cap?.Release(false);
                 }
+
+                _disposed = true;
             }
         }
     }

Capnp.Net.Runtime/ObjectKind.cs

@@ -4,9 +4,7 @@ namespace Capnp
 {
     /// <summary>
     /// The different kinds of Cap'n Proto objects.
-    /// Despite this is a [Flags] enum, it does not make sense to mutually combine literals.
     /// </summary>
-    [Flags]
     public enum ObjectKind: byte
     {
         /// <summary>

Capnp.Net.Runtime/Rpc/Impatient.cs

@@ -76,6 +76,7 @@ namespace Capnp.Rpc
         /// <returns>The underlying promise</returns>
         /// <exception cref="ArgumentNullException"><paramref name="task"/> is null.</exception>
         /// <exception cref="ArgumentException">The task was not registered using MakePipelineAware.</exception>
+        [Obsolete("Please re-generate capnp code-behind. GetAnswer(task).Access(...) was replaced by Access(task, ...)")]
         public static IPromisedAnswer GetAnswer(Task task)
         {
             if (!_taskTable.TryGetValue(task, out var answer))

Capnp.Net.Runtime/Rpc/LazyCapability.cs

@@ -91,12 +91,28 @@ namespace Capnp.Rpc
 
         async Task<DeserializerState> CallImpl(ulong interfaceId, ushort methodId, DynamicSerializerState args, CancellationToken cancellationToken)
         {
-            var cap = await WhenResolved;
+            ConsumedCapability? cap;
+            try
+            {
+                cap = await WhenResolved;
+            }
+            catch
+            {
+                args.Dispose();
+                throw;
+            }
 
-            cancellationToken.ThrowIfCancellationRequested();
+            if (cancellationToken.IsCancellationRequested)
+            {
+                args.Dispose();
+                cancellationToken.ThrowIfCancellationRequested();
+            }
 
             if (cap == null)
+            {
+                args.Dispose();
                 throw new RpcException("Broken capability");
+            }
 
             using var proxy = new Proxy(cap);
             var call = proxy.Call(interfaceId, methodId, args, default);

Capnp.Net.Runtime/Rpc/LocalAnswerCapability.cs

@@ -72,7 +72,10 @@ namespace Capnp.Rpc
             cancellationToken.ThrowIfCancellationRequested();
 
             if (proxy.IsNull)
+            {
+                args.Dispose();
                 throw new RpcException("Broken capability");
+            }
 
             var call = proxy.Call(interfaceId, methodId, args, default);
             var whenReturned = call.WhenReturned;

Capnp.Net.Runtime/Rpc/Proxy.cs

@@ -50,17 +50,9 @@ namespace Capnp.Rpc
 
         static async void DisposeCtrWhenReturned(CancellationTokenRegistration ctr, IPromisedAnswer answer)
         {
-            try
-            {
-                await answer.WhenReturned;
-            }
-            catch
-            {
-            }
-            finally
-            {
-                ctr.Dispose();
-            }
+            try { await answer.WhenReturned; }
+            catch { }
+            finally { ctr.Dispose(); }
         }
 
         /// <summary>
@@ -80,10 +72,16 @@ namespace Capnp.Rpc
             bool obsoleteAndIgnored, CancellationToken cancellationToken = default)
         {
             if (_disposedValue)
+            {
+                args.Dispose();
                 throw new ObjectDisposedException(nameof(Proxy));
+            }
 
             if (ConsumedCap == null)
+            {
+                args.Dispose();
                 throw new InvalidOperationException("Cannot call null capability");
+            }
 
             var answer = ConsumedCap.DoCall(interfaceId, methodId, args);
 
@@ -172,7 +170,7 @@ namespace Capnp.Rpc
         ~Proxy()
         {
 #if DebugFinalizers
-            Logger.LogWarning($"Caught orphaned Proxy, created from here: {CreatorStackTrace}.");
+            Logger?.LogWarning($"Caught orphaned Proxy, created from here: {CreatorStackTrace}.");
 #endif
 
             Dispose(false);

Capnp.Net.Runtime/Rpc/RefCountingCapability.cs

@@ -50,7 +50,7 @@ namespace Capnp.Rpc
         ~RefCountingCapability()
         {
 #if DebugFinalizers
-            Logger.LogWarning($"Caught orphaned capability, created from here: {CreatorStackTrace}.");
+            Logger?.LogWarning($"Caught orphaned capability, created from here: {CreatorStackTrace}.");
 #endif
 
             Dispose(false);

Capnp.Net.Runtime/Rpc/RemoteAnswerCapability.cs

@@ -112,9 +112,17 @@ namespace Capnp.Rpc
                 if (!_question.StateFlags.HasFlag(PendingQuestion.State.TailCall) &&
                      _question.StateFlags.HasFlag(PendingQuestion.State.Returned))
                 {
-                    if (ResolvedCap == null)
+                    try
                     {
-                        throw new RpcException("Answer did not resolve to expected capability");
+                        if (ResolvedCap == null)
+                        {
+                            throw new RpcException("Answer did not resolve to expected capability");
+                        }
+                    }
+                    catch
+                    {
+                        args.Dispose();
+                        throw;
                     }
 
                     return CallOnResolution(interfaceId, methodId, args);
@@ -126,11 +134,13 @@ namespace Capnp.Rpc
 #endif
                     if (_question.StateFlags.HasFlag(PendingQuestion.State.Disposed))
                     {
+                        args.Dispose();
                         throw new ObjectDisposedException(nameof(PendingQuestion));
                     }
 
                     if (_question.StateFlags.HasFlag(PendingQuestion.State.FinishRequested))
                     {
+                        args.Dispose();
                         throw new InvalidOperationException("Finish request was already sent");
                     }
 

Capnp.Net.Runtime/Rpc/RemoteResolvingCapability.cs

@@ -90,9 +90,13 @@ namespace Capnp.Rpc
                         {
                             // Two reasons for ignoring exceptions on the previous task (i.e. not _.Wait()ing):
                             // 1. A faulting predecessor, especially due to cancellation, must not have any impact on this one.
-                            // 2. A faulting disembargo request would be a fatal protocol error, resulting in Abort() - we're dead anyway.
+                            // 2. A faulting disembargo request would imply that the other side cannot send pending requests anyway.
 
-                            cancellationTokenSource.Token.ThrowIfCancellationRequested();
+                            if (cancellationTokenSource.Token.IsCancellationRequested)
+                            {
+                                args.Dispose();
+                                cancellationTokenSource.Token.ThrowIfCancellationRequested();
+                            }
 
                             using var proxy = new Proxy(ResolvedCap);
                             return proxy.Call(interfaceId, methodId, args, default);

Capnp.Net.Runtime/SerializerState.cs

@@ -11,7 +11,7 @@ namespace Capnp
     /// by the code generator. Particularly, those writer classes are actually specializations of SerializerState, adding convenience methods
     /// for accessing the struct's fields.
     /// </summary>
-    public class SerializerState : IStructSerializer
+    public class SerializerState : IStructSerializer, IDisposable
     {
         /// <summary>
         /// Constructs a SerializerState instance for use in RPC context.
@@ -42,6 +42,7 @@ namespace Capnp
         internal uint CapabilityIndex { get; set; }
 
         SerializerState[]? _linkedStates;
+        bool _disposed;
 
         /// <summary>
         /// Constructs an unbound serializer state.
@@ -1380,5 +1381,18 @@ namespace Capnp
             var cap = StructReadRawCap(slot);
             return new Rpc.BareProxy(cap);
         }
+
+        public void Dispose()
+        {
+            if (Caps != null && !_disposed)
+            {
+                foreach (var cap in Caps)
+                {
+                    cap?.Release(false);
+                }
+
+                _disposed = true;
+            }
+        }
     }
 }