Send materials asynchronously

This way we won't block the interface while those materials are sending.

Contributes to issue CURA-5034.

plugins/UM3NetworkPrinting/SendMaterialJob.py

@@ -0,0 +1,33 @@
+# Copyright (c) 2018 Ultimaker B.V.
+# Cura is released under the terms of the LGPLv3 or higher.
+
+from typing import Set, TYPE_CHECKING
+
+from UM.Settings.ContainerRegistry import ContainerRegistry #To get the material profiles we need to send.
+from UM.Job import Job #The interface we're implementing.
+from UM.Logger import Logger
+
+if TYPE_CHECKING:
+    from cura.PrinterOutput.NetworkedPrinterOutputDevice import NetworkedPrinterOutputDevice
+
+##  Asynchronous job to send material profiles to the printer.
+#
+#   This way it won't freeze up the interface while sending those materials.
+class SendMaterialJob(Job):
+    def __init__(self, material_ids: Set[str], device: "NetworkedPrinterDevice"):
+        super().__init__()
+        self.material_ids = material_ids
+        self.device = device
+
+    def run(self):
+        container_registry = ContainerRegistry.getInstance()
+        for material_id in self.material_ids:
+            Logger.log("d", "Syncing material profile with printer: {material_id}".format(material_id = material_id))
+
+            parts = []
+            material = container_registry.findContainers(id = material_id)[0]
+            serialized_material = material.serialize().encode("utf-8")
+            parts.append(self.device._createFormPart("name=\"file\"; filename=\"{file_name}.xml.fdm_material\"".format(file_name = material_id), serialized_material))
+            parts.append(self.device._createFormPart("name=\"filename\"", (material_id + ".xml.fdm_material").encode("utf-8"), "text/plain"))
+
+            self.device.postFormWithParts(target = "/materials", parts = parts)