Add the --grpc_port startup option and start a Java server if it's passed in.

Note that the presence of server/grpc_port does not guarantee that the server actually listens to it and we can't guarantee it, either, because it can always be kill -9'd.

I haven't decided yet how the transition between AF_UNIX and gRPC will work. For now, I'm happy that we can start up a Java server.

The way to get the kernel-chosen port is truly awful, but it is apparently impossible to do so in a different way:

https://github.com/grpc/grpc-java/issues/72

--
MOS_MIGRATED_REVID=119828354

1 files changed, 3 insertions, 2 deletions

diff --git a/src/main/cpp/blaze_startup_options.h b/src/main/cpp/blaze_startup_options.h
index 41629b2f9b..d44cbbee4c 100644
--- a/src/main/cpp/blaze_startup_options.h
+++ b/src/main/cpp/blaze_startup_options.h
@@ -210,8 +210,9 @@ class BlazeStartupOptions {
   // the --host_javabase option.
   string GetHostJavabase();
 
-  // Port for web status server, 0 to disable
-  int webstatus_port;
+  // Port for gRPC command server. 0 means let the kernel choose, -1 means no
+  // gRPC command server.
+  int grpc_port;
 
   // Invocation policy proto. May be NULL.
   const char* invocation_policy;