Update RPC server to use the new call API

src/ruby/lib/grpc/generic/rpc_server.rb

@@ -38,7 +38,7 @@ module GRPC
   # RpcServer hosts a number of services and makes them available on the
   # network.
   class RpcServer
-    include Core::CompletionType
+    include Core::CallOps
     include Core::TimeConsts
     extend ::Forwardable
 
@@ -202,20 +202,14 @@ module GRPC
       end
       @pool.start
       @server.start
-      server_tag = Object.new
+      request_call_tag = Object.new
       until stopped?
-        @server.request_call(server_tag)
-        ev = @cq.pluck(server_tag, @poll_period)
-        next if ev.nil?
-        if ev.type != SERVER_RPC_NEW
-          logger.warn("bad evt: got:#{ev.type}, want:#{SERVER_RPC_NEW}")
-          ev.close
-          next
-        end
-        c = new_active_server_call(ev.call, ev.result)
+        deadline = from_relative_time(@poll_period)
+        an_rpc = @server.request_call(@cq, request_call_tag, deadline)
+        next if an_rpc.nil?
+        c = new_active_server_call(an_rpc)
         unless c.nil?
-          mth = ev.result.method.to_sym
-          ev.close
+          mth = an_rpc.method.to_sym
           @pool.schedule(c) do |call|
             rpc_descs[mth].run_server_method(call, rpc_handlers[mth])
           end
@@ -224,46 +218,49 @@ module GRPC
       @running = false
     end
 
-    def new_active_server_call(call, new_server_rpc)
-      # Accept the call.  This is necessary even if a status is to be sent
-      # back immediately
-      finished_tag = Object.new
-      call_queue = Core::CompletionQueue.new
-      call.metadata = new_server_rpc.metadata  # store the metadata
-      call.server_accept(call_queue, finished_tag)
-      call.server_end_initial_metadata
-
-      # Send UNAVAILABLE if there are too many unprocessed jobs
+    # Sends UNAVAILABLE if there are too many unprocessed jobs
+    def available?(an_rpc)
       jobs_count, max = @pool.jobs_waiting, @max_waiting_requests
       logger.info("waiting: #{jobs_count}, max: #{max}")
-      if @pool.jobs_waiting > @max_waiting_requests
-        logger.warn("NOT AVAILABLE: too many jobs_waiting: #{new_server_rpc}")
-        noop = proc { |x| x }
-        c = ActiveCall.new(call, call_queue, noop, noop,
-                           new_server_rpc.deadline,
-                           finished_tag: finished_tag)
-        c.send_status(StatusCodes::UNAVAILABLE, '')
-        return nil
-      end
+      return an_rpc if @pool.jobs_waiting <= @max_waiting_requests
+      logger.warn("NOT AVAILABLE: too many jobs_waiting: #{an_rpc}")
+      noop = proc { |x| x }
+      c = ActiveCall.new(an_rpc.call, @cq, noop, noop, an_rpc.deadline)
+      c.send_status(StatusCodes::UNAVAILABLE, '')
+      nil
+    end
 
-      # Send NOT_FOUND if the method does not exist
-      mth = new_server_rpc.method.to_sym
-      unless rpc_descs.key?(mth)
-        logger.warn("NOT_FOUND: #{new_server_rpc}")
-        noop = proc { |x| x }
-        c = ActiveCall.new(call, call_queue, noop, noop,
-                           new_server_rpc.deadline,
-                           finished_tag: finished_tag)
-        c.send_status(StatusCodes::NOT_FOUND, '')
-        return nil
-      end
+    # Sends NOT_FOUND if the method can't be found
+    def found?(an_rpc)
+      mth = an_rpc.method.to_sym
+      return an_rpc if rpc_descs.key?(mth)
+      logger.warn("NOT_FOUND: #{an_rpc}")
+      noop = proc { |x| x }
+      c = ActiveCall.new(an_rpc.call, @cq, noop, noop, an_rpc.deadline)
+      c.send_status(StatusCodes::NOT_FOUND, '')
+      nil
+    end
+
+    def new_active_server_call(an_rpc)
+      # Accept the call.  This is necessary even if a status is to be sent
+      # back immediately
+      return nil if an_rpc.nil? || an_rpc.call.nil?
+
+      # allow the metadata to be accessed from the call
+      handle_call_tag = Object.new
+      an_rpc.call.metadata = an_rpc.metadata
+      # TODO: add a hook to send md
+      an_rpc.call.run_batch(@cq, handle_call_tag, INFINITE_FUTURE,
+                            SEND_INITIAL_METADATA => nil)
+      return nil unless available?(an_rpc)
+      return nil unless found?(an_rpc)
 
       # Create the ActiveCall
-      rpc_desc = rpc_descs[mth]
-      logger.info("deadline is #{new_server_rpc.deadline}; (now=#{Time.now})")
-      ActiveCall.new(call, call_queue,
+      logger.info("deadline is #{an_rpc.deadline}; (now=#{Time.now})")
+      rpc_desc = rpc_descs[an_rpc.method.to_sym]
+      ActiveCall.new(an_rpc.call, @cq,
                      rpc_desc.marshal_proc, rpc_desc.unmarshal_proc(:input),
-                     new_server_rpc.deadline, finished_tag: finished_tag)
+                     an_rpc.deadline)
     end
 
     # Pool is a simple thread pool for running server requests.