grpc-proxy: Start the gRPC server and waiting thread much sooner

This change moves a bit the start-up sequence of the gRPC server and
when it connects to the compositor.

Changing the start-up sequence avoids waiting for the channel to change
its state from disconnected to connected, and only wait for the wayland
connection to take place. Otherwise, we would wait first for the wayland
connection to take place, then wait for the gRPC server to start up
and finally wait for the channel to be in connected state, all which
would incur a massive waiting time.

Moving it a bit early requires to at least verify that we have the proxy
side (the wayland connection) is already set-up at that time.

Bug-AGL: SPEC-4912
Signed-off-by: Marius Vlad <marius.vlad@collabora.com>
Change-Id: Ied88a917df8ff98fefa601103ce04e13c8bb21ac

1 files changed, 16 insertions, 14 deletions

diff --git a/grpc-proxy/main-grpc.cpp b/grpc-proxy/main-grpc.cpp
index ea75722..2f9350a 100644
--- a/grpc-proxy/main-grpc.cpp
+++ b/grpc-proxy/main-grpc.cpp
@@ -542,8 +542,19 @@ err:
 }
 
 static void
-start_grpc_server(Shell *aglShell)
+start_grpc_server(std::shared_ptr<grpc::Server> server)
 {
+	LOG("gRPC server listening\n");
+	server->Wait();
+}
+
+int main(int argc, char **argv)
+{
+	(void) argc;
+	(void) argv;
+	Shell *aglShell = nullptr;
+	int ret = 0;
+
 	// instantiante the grpc server
 	std::string server_address(kDefaultGrpcServiceAddress);
 	GrpcServiceImpl service{aglShell};
@@ -555,18 +566,8 @@ start_grpc_server(Shell *aglShell)
 	builder.AddListeningPort(server_address, grpc::InsecureServerCredentials());
 	builder.RegisterService(&service);
 
-	std::unique_ptr<grpc::Server> server(builder.BuildAndStart());
-	LOG("gRPC server listening on %s\n", server_address.c_str());
-
-	server->Wait();
-}
-
-int main(int argc, char **argv)
-{
-	(void) argc;
-	(void) argv;
-	Shell *aglShell;
-	int ret = 0;
+	std::shared_ptr<grpc::Server> server(builder.BuildAndStart());
+	std::thread thread(start_grpc_server, server);
 
 	// this blocks until we detect that another shell client started
 	// running
@@ -581,7 +582,8 @@ int main(int argc, char **argv)
 	std::shared_ptr<struct agl_shell> agl_shell{sh->shell, agl_shell_destroy};
 	aglShell = new Shell(agl_shell, sh);
 
-	std::thread thread(start_grpc_server, aglShell);
+	// now that we have aglShell, set it to the gRPC proxy as well
+	service.setAglShell(aglShell);
 
 	// serve wayland requests
 	while (running && ret != -1) {