From 42cfaa99bd3490bb0849fd66aa56016e763a56a8 Mon Sep 17 00:00:00 2001
From: murgatroid99 <mlumish@google.com>
Date: Mon, 10 Apr 2017 15:43:09 -0700
Subject: Add native tag completion callbacks, dispose of server after
 tryShutdown succeeds

---
 src/node/ext/call.cc      | 23 ++++++++++++++++++++---
 src/node/ext/call.h       |  1 +
 src/node/ext/server.cc    | 37 +++++++++++++++++++++++++++++++++++++
 src/node/ext/server.h     |  2 ++
 src/node/ext/server_uv.cc |  3 +++
 5 files changed, 63 insertions(+), 3 deletions(-)

diff --git a/src/node/ext/call.cc b/src/node/ext/call.cc
index 8d5e2ced6a..bb11cfb83a 100644
--- a/src/node/ext/call.cc
+++ b/src/node/ext/call.cc
@@ -217,6 +217,8 @@ class SendMetadataOp : public Op {
   bool IsFinalOp() {
     return false;
   }
+  void OnComplete() {
+  }
  protected:
   std::string GetTypeString() const {
     return "send_metadata";
@@ -260,6 +262,8 @@ class SendMessageOp : public Op {
   bool IsFinalOp() {
     return false;
   }
+  void OnComplete() {
+  }
  protected:
   std::string GetTypeString() const {
     return "send_message";
@@ -280,6 +284,8 @@ class SendClientCloseOp : public Op {
   bool IsFinalOp() {
     return false;
   }
+  void OnComplete() {
+  }
  protected:
   std::string GetTypeString() const {
     return "client_close";
@@ -349,6 +355,8 @@ class SendServerStatusOp : public Op {
   bool IsFinalOp() {
     return true;
   }
+  void OnComplete() {
+  }
  protected:
   std::string GetTypeString() const {
     return "send_status";
@@ -381,6 +389,8 @@ class GetMetadataOp : public Op {
   bool IsFinalOp() {
     return false;
   }
+  void OnComplete() {
+  }
 
  protected:
   std::string GetTypeString() const {
@@ -413,6 +423,8 @@ class ReadMessageOp : public Op {
   bool IsFinalOp() {
     return false;
   }
+  void OnComplete() {
+  }
 
  protected:
   std::string GetTypeString() const {
@@ -454,6 +466,8 @@ class ClientStatusOp : public Op {
   bool IsFinalOp() {
     return true;
   }
+  void OnComplete() {
+  }
  protected:
   std::string GetTypeString() const {
     return "status";
@@ -478,6 +492,8 @@ class ServerCloseResponseOp : public Op {
   bool IsFinalOp() {
     return false;
   }
+  void OnComplete() {
+  }
 
  protected:
   std::string GetTypeString() const {
@@ -517,16 +533,17 @@ void CompleteTag(void *tag, const char *error_message) {
     callback->Call(1, argv);
   }
   bool is_final_op = false;
-  if (tag_struct->call == NULL) {
-    return;
-  }
   for (vector<unique_ptr<Op> >::iterator it = tag_struct->ops->begin();
        it != tag_struct->ops->end(); ++it) {
     Op *op_ptr = it->get();
+    op_ptr->OnComplete();
     if (op_ptr->IsFinalOp()) {
       is_final_op = true;
     }
   }
+  if (tag_struct->call == NULL) {
+    return;
+  }
   tag_struct->call->CompleteBatch(is_final_op);
 }
 
diff --git a/src/node/ext/call.h b/src/node/ext/call.h
index 4316e9ed88..b38f50060c 100644
--- a/src/node/ext/call.h
+++ b/src/node/ext/call.h
@@ -106,6 +106,7 @@ class Op {
   virtual ~Op();
   v8::Local<v8::Value> GetOpType() const;
   virtual bool IsFinalOp() = 0;
+  virtual void OnComplete() = 0;
 
  protected:
   virtual std::string GetTypeString() const = 0;
diff --git a/src/node/ext/server.cc b/src/node/ext/server.cc
index f0920c842a..22c89c5862 100644
--- a/src/node/ext/server.cc
+++ b/src/node/ext/server.cc
@@ -117,6 +117,8 @@ class NewCallOp : public Op {
   bool IsFinalOp() {
     return false;
   }
+  void OnComplete() {
+  }
 
   grpc_call *call;
   grpc_call_details details;
@@ -126,6 +128,32 @@ class NewCallOp : public Op {
   std::string GetTypeString() const { return "new_call"; }
 };
 
+class TryShutdownOp: public Op {
+ public:
+  TryShutdownOp(Server *server, Local<Value> server_value) : server(server) {
+    server_persist.Reset(server_value);
+  }
+  Local<Value> GetNodeValue() const {
+    EscapableHandleScope scope;
+    return scope.Escape(Nan::New(server_persist));
+  }
+  bool ParseOp(Local<Value> value, grpc_op *out) {
+    return true;
+  }
+  bool IsFinalOp() {
+    return false;
+  }
+  void OnComplete() {
+    server->DestroyWrappedServer();
+  }
+ protected:
+  std::string GetTypeString() const { return "try_shutdown"; }
+ private:
+  Server *server;
+  Nan::Persistent<v8::Value, Nan::CopyablePersistentTraits<v8::Value>>
+      server_persist;
+};
+
 void Server::Init(Local<Object> exports) {
   HandleScope scope;
   Local<FunctionTemplate> tpl = Nan::New<FunctionTemplate>(New);
@@ -147,6 +175,13 @@ bool Server::HasInstance(Local<Value> val) {
   return Nan::New(fun_tpl)->HasInstance(val);
 }
 
+void Server::DestroyWrappedServer() {
+  if (this->wrapped_server != NULL) {
+    grpc_server_destroy(this->wrapped_server);
+    this->wrapped_server = NULL;
+  }
+}
+
 NAN_METHOD(Server::New) {
   /* If this is not a constructor call, make a constructor call and return
      the result */
@@ -242,7 +277,9 @@ NAN_METHOD(Server::TryShutdown) {
     return Nan::ThrowTypeError("tryShutdown can only be called on a Server");
   }
   Server *server = ObjectWrap::Unwrap<Server>(info.This());
+  TryShutdownOp *op = new TryShutdownOp(server, info.This());
   unique_ptr<OpVec> ops(new OpVec());
+  ops->push_back(unique_ptr<Op>(op));
   grpc_server_shutdown_and_notify(
       server->wrapped_server, GetCompletionQueue(),
       new struct tag(new Nan::Callback(info[0].As<Function>()), ops.release(),
diff --git a/src/node/ext/server.h b/src/node/ext/server.h
index ab5fc210e8..c0f2e86554 100644
--- a/src/node/ext/server.h
+++ b/src/node/ext/server.h
@@ -53,6 +53,8 @@ class Server : public Nan::ObjectWrap {
      JavaScript constructor */
   static bool HasInstance(v8::Local<v8::Value> val);
 
+  void DestroyWrappedServer();
+
  private:
   explicit Server(grpc_server *server);
   ~Server();
diff --git a/src/node/ext/server_uv.cc b/src/node/ext/server_uv.cc
index 82e7589fc8..bf402e1961 100644
--- a/src/node/ext/server_uv.cc
+++ b/src/node/ext/server_uv.cc
@@ -76,6 +76,8 @@ class ServerShutdownOp : public Op {
   bool IsFinalOp() {
     return false;
   }
+  void OnComplete() {
+  }
 
   grpc_server *server;
 
@@ -104,6 +106,7 @@ NAN_METHOD(ServerShutdownCallback) {
 }
 
 void Server::ShutdownServer() {
+  Nan::HandleScope scope;
   if (this->wrapped_server != NULL) {
     if (shutdown_callback == NULL) {
       Local<FunctionTemplate>callback_tpl =
-- 
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