run server locally

RELEASE.md

@@ -123,6 +123,7 @@ To release a new version of Spyder you need to follow these steps:
 * Update our subrepos with the following commands, but only if new versions are available!
 
       git subrepo pull external-deps/spyder-kernels
+      git subrepo pull external-deps/spyder-kernels-server
       git subrepo pull external-deps/python-lsp-server
       git subrepo pull external-deps/qtconsole
 

installers/Windows/req-extras-pull-request.txt

@@ -24,4 +24,5 @@ spyder-terminal>=1.2.2
 
 # Spyder external dependencies (spyder-kernels and qdarkstyle)
 ./external-deps/spyder-kernels
+./external-deps/spyder-kernels-server
 ./external-deps/qdarkstyle

spyder/plugins/ipythonconsole/widgets/mixins.py

@@ -8,6 +8,9 @@
 IPython Console mixins.
 """
 import zmq
+import sys
+
+from qtpy.QtCore import QProcess
 
 # Local imports
 from spyder.plugins.ipythonconsole.utils.kernel_handler import KernelHandler
@@ -17,23 +20,29 @@ class KernelConnectorMixin:
     """Needs https://github.com/jupyter/jupyter_client/pull/835"""
     def __init__(self):
         super().__init__()
+        self.hostname = None
+        self.sshkey = None
+        self.password = None
+        self.start_local_server()
         self.port = "5556"
         self.context = zmq.Context()
         self.socket = self.context.socket(zmq.REQ)
         self.socket.connect("tcp://localhost:%s" % self.port)
 
+    def start_local_server(self):
+        self.server = QProcess(self)
+        self.server.start(sys.executable, ["-m", "spyder_kernels_server"])
+
     def new_kernel(self, kernel_spec):
         """Get a new kernel"""
         self.socket.send_pyobj(["open_kernel", kernel_spec])
         cmd, connection_file, connection_info = self.socket.recv_pyobj()
         if connection_file == "error":
             raise connection_info
 
-        hostname, sshkey, password = None, None, None
-
         kernel_handler = KernelHandler.new_from_spec(
             kernel_spec, connection_file, connection_info,
-            hostname, sshkey, password
+            self.hostname, self.sshkey, self.password
         )
 
         kernel_handler.sig_request_close.connect(self.close_kernel)
@@ -45,7 +54,6 @@ def close_kernel(self, connection_file):
         self.socket.recv_pyobj()
 
 
-
 class CachedKernelMixin:
     """Cached kernel mixin."""
     def __init__(self):