Check connection GrpcServer before returning (#558)

* check connection GrpcServer

* remove dummy test

Author: cbellot000

ansys/dpf/core/server_types.py

@@ -538,6 +538,7 @@ def __init__(self,
                  launch_server=True,
                  docker_name=None,
                  use_pypim=True,
+                 num_connection_tryouts=3,
                  ):
         # Load DPFClientAPI
         from ansys.dpf.core.misc import is_pypim_configured
@@ -569,8 +570,19 @@ def __init__(self,
         self._input_port = port
         self.live = True
         self._create_shutdown_funcs()
+        self._check_first_call(num_connection_tryouts)
         self.set_as_global(as_global=as_global)
 
+    def _check_first_call(self, num_connection_tryouts):
+        for i in range(num_connection_tryouts):
+            try:
+                self.version
+                break
+            except errors.DPFServerException as e:
+                if ("GOAWAY" not in str(e.args) and "unavailable" not in str(e.args)) \
+                        or i == (num_connection_tryouts - 1):
+                    raise e
+
     @property
     def version(self):
         from ansys.dpf.gate import data_processing_capi, integral_types

tests/test_server.py

@@ -75,19 +75,6 @@ def test_start_local_server_with_config(self, server_config):
         assert has_local_server()
         shutdown_all_session_servers()
 
-    def test_connect_to_server(self, server_config):
-        set_server_configuration(server_config)
-        print(dpf.core.SERVER_CONFIGURATION)
-        shutdown_all_session_servers()
-        start_local_server(timeout=10.)
-        print("has_local_server", has_local_server())
-        if hasattr(dpf.core.SERVER, "ip"):
-            connect_to_server(ip=dpf.core.SERVER.ip, port=dpf.core.SERVER.port, timeout=10.,
-                              as_global=False)
-        else:
-            connect_to_server(timeout=10., as_global=False)
-        assert has_local_server()
-
     def test_shutdown_all_session_servers(self, server_config):
         set_server_configuration(server_config)
         print(dpf.core.SERVER_CONFIGURATION)