some work on grpc add nodes and links, some work on query session, redraw nodes

coretk/coretk/app.py

@@ -16,16 +16,20 @@ class Application(tk.Frame):
         self.setup_app()
         self.menubar = None
         self.canvas = None
+
+        # start grpc
         self.core_grpc = CoreGrpc()
+
         self.create_menu()
         self.create_widgets()
 
     def load_images(self):
+        """
+        Load core images
+        :return:
+        """
         images.load_core_images(Images)
 
-    def close_grpc(self):
-        self.core_grpc.close()
-
     def setup_app(self):
         self.master.title("CORE")
         self.master.geometry("1000x800")
@@ -47,8 +51,8 @@ class Application(tk.Frame):
         core_editbar.create_toolbar()
 
         self.canvas = CanvasGraph(
-            grpc=self.core_grpc,
             master=self,
+            grpc=self.core_grpc,
             background="#cccccc",
             scrollregion=(0, 0, 1000, 1000),
         )
@@ -79,4 +83,3 @@ if __name__ == "__main__":
     logging.basicConfig(level=logging.DEBUG)
     app = Application()
     app.mainloop()
-    app.close_grpc()

coretk/coretk/coregrpc.py

@@ -14,18 +14,20 @@ class CoreGrpc:
         self.core = client.CoreGrpcClient()
         self.session_id = None
         self.set_up()
+        self.interface_helper = None
 
     def log_event(self, event):
         logging.info("event: %s", event)
 
-    def set_up(self):
+    def redraw_canvas(self):
+        return
+
+    def create_new_session(self):
         """
-        Create session, handle events session may broadcast, change session state
+        Create a new session
 
         :return: nothing
         """
-        self.core.connect()
-        # create session
         response = self.core.create_session()
         logging.info("created session: %s", response)
 
@@ -33,39 +35,67 @@ class CoreGrpc:
         self.session_id = response.session_id
         self.core.events(self.session_id, self.log_event)
 
-        # change session state
+    def query_existing_sessions(self, sessions):
+        """
+        Query for existing sessions and prompt to join one
+
+        :param repeated core_pb2.SessionSummary sessions: summaries of all the existing sessions
+
+        :return: nothing
+        """
+        for session in sessions:
+            logging.info("Session id: %s, Session state: %s", session.id, session.state)
+        logging.info("Input a session you want to enter from the keyboard:")
+        usr_input = int(input())
+        if usr_input == 0:
+            self.create_new_session()
+        else:
+            response = self.core.get_session(usr_input)
+            self.session_id = usr_input
+            # self.core.events(self.session_id, self.log_event)
+            logging.info("Entering session_id %s.... Result: %s", usr_input, response)
+
+    def set_up(self):
+        """
+        Query sessions, if there exist any, promt whether to join one
+
+        :return: nothing
+        """
+        self.core.connect()
+
+        response = self.core.get_sessions()
+        logging.info("all sessions: %s", response)
+
+        # if there are no sessions, create a new session, else join a session
+        sessions = response.sessions
+
+        if len(sessions) == 0:
+            self.create_new_session()
+        else:
+            # self.create_new_session()
+            self.query_existing_sessions(sessions)
+
+    def set_configuration_state(self):
         response = self.core.set_session_state(
             self.session_id, core_pb2.SessionState.CONFIGURATION
         )
         logging.info("set session state: %s", response)
 
+    def set_instantiate_state(self):
+        response = self.core.set_session_state(
+            self.session_id, core_pb2.SessionState.INSTANTIATION
+        )
+        logging.info("set session state: %s", response)
+
     def get_session_id(self):
         return self.session_id
 
-    # TODO add checkings to the function
+    def add_node(self, node_type, model, x, y, name):
-    def add_node(self, x, y, node_name):
+        logging.info("ADD NODE %s", name)
-        link_layer_nodes = ["switch", "hub", "wlan", "rj45", "tunnel"]
-        network_layer_nodes = ["default"]
-        node = None
-        if node_name in link_layer_nodes:
-            if node_name == "switch":
-                node = core_pb2.Node(type=core_pb2.NodeType.SWITCH)
-            elif node_name == "hub":
-                node = core_pb2.Node(type=core_pb2.NodeType.HUB)
-            elif node_name == "wlan":
-                node = core_pb2.Node(type=core_pb2.NodeType.WIRELESS_LAN)
-            elif node_name == "rj45":
-                node = core_pb2.Node(type=core_pb2.NodeType.RJ45)
-            elif node_name == "tunnel":
-                node = core_pb2.Node(type=core_pb2.NodeType.TUNNEL)
-
-        elif node_name in network_layer_nodes:
         position = core_pb2.Position(x=x, y=y)
-            node = core_pb2.Node(position=position)
+        node = core_pb2.Node(type=node_type, position=position, model=model, image=name)
-        else:
-            return
         response = self.core.add_node(self.session_id, node)
-        logging.info("created %s: %s", node_name, response)
+        logging.info("created node: %s", response)
         return response.node_id
 
     def edit_node(self, session_id, node_id, x, y):
@@ -73,6 +103,34 @@ class CoreGrpc:
         response = self.core.edit_node(session_id, node_id, position)
         logging.info("updated node id %s: %s", node_id, response)
 
+    # def create_interface_helper(self):
+    #     self.interface_helper = self.core.InterfaceHelper(ip4_prefix="10.83.0.0/16")
+
+    # TODO case for other core_pb2.NodeType
+    def add_link(self, id1, id2, type1, type2):
+        """
+        Grpc client request add link
+
+        :param int session_id: session id
+        :param int id1: node 1 core id
+        :param core_pb2.NodeType type1: node 1 core node type
+        :param int id2: node 2 core id
+        :param core_pb2.NodeType type2: node 2 core node type
+        :return: nothing
+        """
+        if not self.interface_helper:
+            logging.debug("INTERFACE HELPER NOT CREATED YET, CREATING ONE...")
+            self.interface_helper = client.InterfaceHelper(ip4_prefix="10.83.0.0/16")
+
+        interface1 = None
+        interface2 = None
+        if type1 == core_pb2.NodeType.DEFAULT:
+            interface1 = self.interface_helper.create_interface(id1, 0)
+        if type2 == core_pb2.NodeType.DEFAULT:
+            interface2 = self.interface_helper.create_interface(id2, 0)
+        response = self.core.add_link(self.session_id, id1, id2, interface1, interface2)
+        logging.info("created link: %s", response)
+
     def close(self):
         """
         Clean ups when done using grpc

coretk/coretk/coretoolbar.py

@@ -27,7 +27,6 @@ class CoreToolbar(object):
         self.width = 32
         self.height = 32
 
-        # Used for drawing the horizontally displayed menu items for network-layer nodes and link-layer node
         self.selection_tool_button = None
 
         # Reference to the option menus
@@ -35,8 +34,6 @@ class CoreToolbar(object):
         self.marker_option_menu = None
         self.network_layer_option_menu = None
 
-        # variables used by canvas graph
-        self.image_to_draw = None
         self.canvas = None
 
     def update_canvas(self, canvas):
@@ -151,63 +148,79 @@ class CoreToolbar(object):
         logging.debug("Click SELECTION TOOL")
         self.canvas.mode = GraphMode.SELECT
 
-    def click_start_stop_session_tool(self):
+    def click_start_session_tool(self):
         logging.debug("Click START STOP SESSION button")
         self.destroy_children_widgets(self.edit_frame)
-        self.canvas.set_canvas_mode(GraphMode.SELECT)
+        self.canvas.mode = GraphMode.SELECT
         self.create_runtime_toolbar()
 
+        # set configuration state
+        self.canvas.core_grpc.set_configuration_state()
+
+        # grpc client requests creating nodes
+        for node in self.canvas.grpc_manager.nodes_to_create.values():
+            self.canvas.core_grpc.add_node(
+                node.type, node.model, int(node.x), int(node.y), node.name
+            )
+        self.canvas.grpc_manager.nodes_to_create.clear()
+
+        for edge in self.canvas.grpc_manager.edges_to_create.values():
+            self.canvas.core_grpc.add_link(edge.id1, edge.id2, edge.type1, edge.type2)
+        self.canvas.grpc_manager.edges_to_create.clear()
+
+        self.canvas.core_grpc.set_instantiate_state()
+
     def click_link_tool(self):
         logging.debug("Click LINK button")
-        self.canvas.set_canvas_mode(GraphMode.EDGE)
+        self.canvas.mode = GraphMode.EDGE
 
     def pick_router(self, main_button):
         logging.debug("Pick router option")
         self.network_layer_option_menu.destroy()
         main_button.configure(image=Images.get("router"))
-        self.canvas.set_canvas_mode(GraphMode.PICKNODE)
+        self.canvas.mode = GraphMode.PICKNODE
-        self.canvas.set_drawing_image(Images.get("router"))
+        self.canvas.draw_node_image = Images.get("router")
-        self.canvas.set_drawing_name("default")
+        self.canvas.draw_node_name = "router"
 
     def pick_host(self, main_button):
         logging.debug("Pick host option")
         self.network_layer_option_menu.destroy()
         main_button.configure(image=Images.get("host"))
-        self.canvas.set_canvas_mode(GraphMode.PICKNODE)
+        self.canvas.mode = GraphMode.PICKNODE
-        self.canvas.set_drawing_image(Images.get("host"))
+        self.canvas.draw_node_image = Images.get("host")
-        self.canvas.set_drawing_name("default")
+        self.canvas.draw_node_name = "host"
 
     def pick_pc(self, main_button):
         logging.debug("Pick PC option")
         self.network_layer_option_menu.destroy()
         main_button.configure(image=Images.get("pc"))
-        self.canvas.set_canvas_mode(GraphMode.PICKNODE)
+        self.canvas.mode = GraphMode.PICKNODE
-        self.canvas.set_drawing_image(Images.get("pc"))
+        self.canvas.draw_node_image = Images.get("pc")
-        self.canvas.set_drawing_name("default")
+        self.canvas.draw_node_name = "PC"
 
     def pick_mdr(self, main_button):
         logging.debug("Pick MDR option")
         self.network_layer_option_menu.destroy()
         main_button.configure(image=Images.get("mdr"))
-        self.canvas.set_canvas_mode(GraphMode.PICKNODE)
+        self.canvas.mode = GraphMode.PICKNODE
-        self.canvas.set_drawing_image(Images.get("mdr"))
+        self.canvas.draw_node_image = Images.get("mdr")
-        self.canvas.set_drawing_name("default")
+        self.canvas.draw_node_name = "mdr"
 
     def pick_prouter(self, main_button):
         logging.debug("Pick prouter option")
         self.network_layer_option_menu.destroy()
         main_button.configure(image=Images.get("prouter"))
-        self.canvas.set_canvas_mode(GraphMode.PICKNODE)
+        self.canvas.mode = GraphMode.PICKNODE
-        self.canvas.set_drawing_image(Images.get("prouter"))
+        self.canvas.draw_node_image = Images.get("prouter")
-        self.canvas.set_drawing_name("default")
+        self.canvas.draw_node_name = "prouter"
 
     def pick_ovs(self, main_button):
         logging.debug("Pick OVS option")
         self.network_layer_option_menu.destroy()
         main_button.configure(image=Images.get("ovs"))
-        self.canvas.set_canvas_mode(GraphMode.PICKNODE)
+        self.canvas.mode = GraphMode.PICKNODE
-        self.canvas.set_drawing_image(Images.get("ovs"))
+        self.canvas.draw_node_image = Images.get("ovs")
-        self.canvas.set_drawing_name("default")
+        self.canvas.draw_node_name = "OVS"
 
     # TODO what graph node is this
     def pick_editnode(self, main_button):
@@ -294,40 +307,41 @@ class CoreToolbar(object):
         logging.debug("Pick link-layer node HUB")
         self.link_layer_option_menu.destroy()
         main_button.configure(image=Images.get("hub"))
-        self.canvas.set_canvas_mode(GraphMode.PICKNODE)
+        self.canvas.mode = GraphMode.PICKNODE
-        self.canvas.set_drawing_image(Images.get("hub"))
+        self.canvas.draw_node_image = Images.get("hub")
-        self.canvas.set_drawing_name("hub")
+        self.canvas.draw_node_name = "hub"
 
     def pick_switch(self, main_button):
         logging.debug("Pick link-layer node SWITCH")
         self.link_layer_option_menu.destroy()
         main_button.configure(image=Images.get("switch"))
-        self.canvas.set_canvas_mode(GraphMode.PICKNODE)
+        self.canvas.mode = GraphMode.PICKNODE
-        self.canvas.set_drawing_image(Images.get("switch"))
+        self.canvas.draw_node_image = Images.get("switch")
-        self.canvas.set_drawing_name("switch")
+        self.canvas.draw_node_name = "switch"
 
     def pick_wlan(self, main_button):
         logging.debug("Pick link-layer node WLAN")
         self.link_layer_option_menu.destroy()
         main_button.configure(image=Images.get("wlan"))
-        self.canvas.set_canvas_mode(GraphMode.PICKNODE)
+        self.canvas.mode = GraphMode.PICKNODE
-        self.canvas.set_drawing_image(Images.get("wlan"))
+        self.canvas.draw_node_image = Images.get("wlan")
-        self.canvas.set_drawing_name("wlan")
+        self.canvas.draw_node_name = "wlan"
 
     def pick_rj45(self, main_button):
         logging.debug("Pick link-layer node RJ45")
         self.link_layer_option_menu.destroy()
         main_button.configure(image=Images.get("rj45"))
-        self.canvas.set_canvas_mode(GraphMode.PICKNODE)
+        self.canvas.mode = GraphMode.PICKNODE
-        self.canvas.set_drawing_image(Images.get("rj45"))
+        self.canvas.draw_node_image = Images.get("rj45")
+        self.canvas.draw_node_name = "rj45"
 
     def pick_tunnel(self, main_button):
         logging.debug("Pick link-layer node TUNNEL")
         self.link_layer_option_menu.destroy()
         main_button.configure(image=Images.get("tunnel"))
-        self.canvas.set_canvas_mode(GraphMode.PICKNODE)
+        self.canvas.mode = GraphMode.PICKNODE
-        self.canvas.set_drawing_image(Images.get("tunnel"))
+        self.canvas.draw_node_image = Images.get("tunnel")
-        self.canvas.set_drawing_image(Images.get("tunnel"))
+        self.canvas.draw_node_name = "tunnel"
 
     def draw_link_layer_options(self, link_layer_button):
         """
@@ -476,11 +490,10 @@ class CoreToolbar(object):
         CreateToolTip(marker_main_button, "background annotation tools")
 
     def create_toolbar(self):
-        # self.load_toolbar_images()
         self.create_regular_button(
             self.edit_frame,
             Images.get("start"),
-            self.click_start_stop_session_tool,
+            self.click_start_session_tool,
             "start the session",
         )
         self.create_radio_button(

coretk/coretk/graph.py

@@ -2,6 +2,9 @@ import enum
 import logging
 import tkinter as tk
 
+from coretk.grpcmanagement import GrpcManager
+from coretk.images import Images
+
 
 class GraphMode(enum.Enum):
     SELECT = 0
@@ -12,12 +15,11 @@ class GraphMode(enum.Enum):
 
 
 class CanvasGraph(tk.Canvas):
-    def __init__(self, grpc=None, master=None, cnf=None, **kwargs):
+    def __init__(self, master=None, grpc=None, cnf=None, **kwargs):
         if cnf is None:
             cnf = {}
         kwargs["highlightthickness"] = 0
         super().__init__(master, cnf, **kwargs)
-        self.core_grpc = grpc
         self.mode = GraphMode.SELECT
         self.draw_node_image = None
         self.draw_node_name = None
@@ -26,19 +28,32 @@ class CanvasGraph(tk.Canvas):
         self.nodes = {}
         self.edges = {}
         self.drawing_edge = None
-
         self.setup_menus()
         self.setup_bindings()
         self.draw_grid()
+        self.core_grpc = grpc
+        self.grpc_manager = GrpcManager()
+        self.draw_existing_node()
 
-    def set_canvas_mode(self, mode):
+    def setup_menus(self):
-        self.mode = mode
+        self.node_context = tk.Menu(self.master)
+        self.node_context.add_command(label="One")
+        self.node_context.add_command(label="Two")
+        self.node_context.add_command(label="Three")
 
-    def set_drawing_image(self, img):
+    def setup_bindings(self):
-        self.draw_node_image = img
+        """
+        Bind any mouse events or hot keys to the matching action
 
-    def set_drawing_name(self, name):
+        :return: nothing
-        self.draw_node_name = name
+        """
+        self.bind("<ButtonPress-1>", self.click_press)
+        self.bind("<ButtonRelease-1>", self.click_release)
+        self.bind("<B1-Motion>", self.click_motion)
+        self.bind("<Button-3>", self.context)
+        # self.bind("e", self.set_mode)
+        # self.bind("s", self.set_mode)
+        # self.bind("n", self.set_mode)
 
     def draw_grid(self, width=1000, height=750):
         """
@@ -65,25 +80,20 @@ class CanvasGraph(tk.Canvas):
         for i in range(0, height, 27):
             self.create_line(0, i, width, i, dash=(2, 4), tags="grid line")
 
-    def setup_menus(self):
+    def draw_existing_node(self):
-        self.node_context = tk.Menu(self.master)
-        self.node_context.add_command(label="One")
-        self.node_context.add_command(label="Two")
-        self.node_context.add_command(label="Three")
-
-    def setup_bindings(self):
         """
-        Bind any mouse events or hot keys to the matching action
+        Draw existing node while updating the grpc manager based on that
 
         :return: nothing
         """
-        self.bind("<ButtonPress-1>", self.click_press)
+        session_id = self.core_grpc.session_id
-        self.bind("<ButtonRelease-1>", self.click_release)
+        response = self.core_grpc.core.get_session(session_id)
-        self.bind("<B1-Motion>", self.click_motion)
+        nodes = response.session.nodes
-        self.bind("<Button-3>", self.context)
+        if len(nodes) > 0:
-        # self.bind("e", self.set_mode)
+            for node in nodes:
-        # self.bind("s", self.set_mode)
+                image = Images.convert_type_and_model_to_image(node.type, node.model)
-        # self.bind("n", self.set_mode)
+                return image
+                # n = CanvasNode(node.position.x, node.position.y, image, self, node.id)
 
     def canvas_xy(self, event):
         """
@@ -172,6 +182,10 @@ class CanvasGraph(tk.Canvas):
             node_dst = self.nodes[edge.dst]
             node_dst.edges.add(edge)
 
+            self.grpc_manager.add_edge(
+                self.core_grpc.get_session_id(), edge.token, node_src.id, node_dst.id
+            )
+
         logging.debug(f"edges: {self.find_withtag('edge')}")
 
     def click_press(self, event):
@@ -207,40 +221,14 @@ class CanvasGraph(tk.Canvas):
             logging.debug(f"node context: {selected}")
             self.node_context.post(event.x_root, event.y_root)
 
-    # def set_mode(self, event):
-    #     """
-    #     Set canvas mode according to the hot key that has been pressed
-    #
-    #     :param event: key event
-    #     :return: nothing
-    #     """
-    #     logging.debug(f"mode event: {event}")
-    #     if event.char == "e":
-    #         self.mode = GraphMode.EDGE
-    #     elif event.char == "s":
-    #         self.mode = GraphMode.SELECT
-    #     elif event.char == "n":
-    #         self.mode = GraphMode.NODE
-    #     logging.debug(f"graph mode: {self.mode}")
-
-    # def add_node(self, x, y, image_name):
-    #     image = Images.get(image_name)
-    #     node = CanvasNode(x, y, image, self)
-    #     self.nodes[node.id] = node
-    #     return node
-
     def add_node(self, x, y, image, node_name):
-        core_session_id = self.core_grpc.get_session_id()
-        core_node_id = self.core_grpc.add_node(int(x), int(y), node_name)
         node = CanvasNode(
-            core_session_id=core_session_id,
+            x=x, y=y, image=image, canvas=self, core_id=self.grpc_manager.peek_id()
-            core_node_id=core_node_id,
-            x=x,
-            y=y,
-            image=image,
-            canvas=self,
         )
         self.nodes[node.id] = node
+        self.grpc_manager.add_node(
+            self.core_grpc.get_session_id(), node.id, x, y, node_name
+        )
         return node
 
 
@@ -283,17 +271,16 @@ class CanvasEdge:
 
 
 class CanvasNode:
-    def __init__(self, core_session_id, core_node_id, x, y, image, canvas):
+    def __init__(self, x, y, image, canvas, core_id):
         self.image = image
         self.canvas = canvas
         self.id = self.canvas.create_image(
             x, y, anchor=tk.CENTER, image=self.image, tags="node"
         )
+        self.core_id = core_id
         self.x_coord = x
         self.y_coord = y
-        self.core_session_id = core_session_id
+        self.name = f"Node {self.core_id}"
-        self.core_node_id = core_node_id
-        self.name = f"Node {self.core_node_id}"
         self.text_id = self.canvas.create_text(x, y + 20, text=self.name)
         self.canvas.tag_bind(self.id, "<ButtonPress-1>", self.click_press)
         self.canvas.tag_bind(self.id, "<ButtonRelease-1>", self.click_release)
@@ -315,12 +302,6 @@ class CanvasNode:
     def click_release(self, event):
         logging.debug(f"click release {self.name}: {event}")
         self.update_coords()
-        self.canvas.core_grpc.edit_node(
-            self.core_session_id,
-            self.core_node_id,
-            int(self.x_coord),
-            int(self.y_coord),
-        )
         self.moving = None
 
     def motion(self, event):

coretk/coretk/grpcmanagement.py

@@ -0,0 +1,157 @@
+"""
+Manage useful informations about the nodes, edges and configuration
+that can be useful for grpc, acts like a session class
+"""
+import logging
+
+from core.api.grpc import core_pb2
+
+link_layer_nodes = ["switch", "hub", "wlan", "rj45", "tunnel"]
+network_layer_nodes = ["router", "host", "PC", "mdr", "prouter", "OVS"]
+
+
+class Node:
+    def __init__(self, session_id, node_id, type, model, x, y, name):
+        """
+        Create an instance of a node
+
+        :param int session_id: session id
+        :param int node_id: node id
+        :param core_pb2.NodeType type: node type
+        :param int x: x coordinate
+        :param int y: coordinate
+        """
+        self.session_id = session_id
+        self.node_id = node_id
+        self.type = type
+        self.x = x
+        self.y = y
+        self.model = model
+        self.name = name
+
+
+class Edge:
+    def __init__(self, session_id, node_id_1, node_type_1, node_id_2, node_type_2):
+        """
+        Create an instance of an edge
+        :param int session_id: session id
+        :param int node_id_1: node 1 id
+        :param int node_type_1: node 1 type
+        :param core_pb2.NodeType node_id_2: node 2 id
+        :param core_pb2.NodeType node_type_2: node 2 type
+        """
+        self.session_id = session_id
+        self.id1 = node_id_1
+        self.id2 = node_id_2
+        self.type1 = node_type_1
+        self.type2 = node_type_2
+
+
+class GrpcManager:
+    def __init__(self):
+        self.nodes = {}
+        self.edges = {}
+        self.id = 1
+        # A list of id for re-use, keep in increasing order
+        self.reusable = []
+        self.nodes_to_create = {}
+        self.edges_to_create = {}
+
+    def peek_id(self):
+        """
+        Peek the next id to be used
+
+        :return: nothing
+        """
+        if len(self.reusable) == 0:
+            return self.id
+        else:
+            return self.reusable[0]
+
+    def get_id(self):
+        """
+        Get the next node id as well as update id status and reusable ids
+
+        :rtype: int
+        :return: the next id to be used
+        """
+        if len(self.reusable) == 0:
+            new_id = self.id
+            self.id = self.id + 1
+            return new_id
+        else:
+            return self.reusable.pop(0)
+
+    # TODO figure out the name of ovs node
+    def add_node(self, session_id, canvas_id, x, y, name):
+        """
+        Add node, with information filled in, to grpc manager
+
+        :param int session_id: session id
+        :param int canvas_id: node's canvas id
+        :param int x: x coord
+        :param int y: y coord
+        :param str name: node type
+        :return: nothing
+        """
+        node_type = None
+        node_model = None
+        if name in link_layer_nodes:
+            if name == "switch":
+                node_type = core_pb2.NodeType.SWITCH
+            elif name == "hub":
+                node_type = core_pb2.NodeType.HUB
+            elif name == "wlan":
+                node_type = core_pb2.NodeType.WIRELESS_LAN
+            elif name == "rj45":
+                node_type = core_pb2.NodeType.RJ45
+            elif name == "tunnel":
+                node_type = core_pb2.NodeType.TUNNEL
+        elif name in network_layer_nodes:
+            node_type = core_pb2.NodeType.DEFAULT
+            # TODO what is the model name for ovs
+            node_model = name
+        else:
+            logging.error("grpcmanagemeny.py INVALID node name")
+        create_node = Node(session_id, self.get_id(), node_type, node_model, x, y, name)
+        self.nodes[canvas_id] = create_node
+        self.nodes_to_create[canvas_id] = create_node
+        logging.debug(
+            "Adding node to GrpcManager.. Session id: %s, Coords: (%s, %s), Name: %s",
+            session_id,
+            x,
+            y,
+            name,
+        )
+
+    def add_preexisting_node(self):
+        return
+
+    def delete_node(self, canvas_id):
+        """
+        Delete a node from the session
+
+        :param int canvas_id: node's id in the canvas
+        :return: thing
+        """
+        try:
+            self.nodes.pop(canvas_id)
+            self.reuseable.append(canvas_id)
+            self.reuseable.sort()
+        except KeyError:
+            logging.error("grpcmanagement.py INVALID NODE CANVAS ID")
+
+    def add_edge(self, session_id, token, canvas_id_1, canvas_id_2):
+        if canvas_id_1 in self.nodes and canvas_id_2 in self.nodes:
+            edge = Edge(
+                session_id,
+                self.nodes[canvas_id_1].node_id,
+                self.nodes[canvas_id_1].type,
+                self.nodes[canvas_id_2].node_id,
+                self.nodes[canvas_id_2].type,
+            )
+            self.edges[token] = edge
+            self.edges_to_create[token] = edge
+            logging.debug("Adding edge to grpc manager...")
+        else:
+            logging.error("grpcmanagement.py INVALID CANVAS NODE ID")

coretk/coretk/images.py

@@ -1,7 +1,10 @@
+import logging
 import os
 
 from PIL import Image, ImageTk
 
+from core.api.grpc import core_pb2
+
 PATH = os.path.abspath(os.path.dirname(__file__))
 
 
@@ -19,6 +22,41 @@ class Images:
     def get(cls, name):
         return cls.images[name]
 
+    @classmethod
+    def convert_type_and_model_to_image(cls, node_type, node_model):
+        """
+                Retrieve image based on type and model
+                :param core_pb2.NodeType node_type: core node type
+                :param string node_model: the node model
+
+                :return: the matching image
+                """
+        if node_type == core_pb2.NodeType.SWITCH:
+            return Images.get("switch")
+        if node_type == core_pb2.NodeType.HUB:
+            return Images.get("hub")
+        if node_type == core_pb2.NodeType.WIRELESS_LAN:
+            return Images.get("wlan")
+        if node_type == core_pb2.NodeType.RJ45:
+            return Images.get("rj45")
+        if node_type == core_pb2.NodeType.TUNNEL:
+            return Images.get("tunnel")
+        if node_type == core_pb2.NodeType.DEFAULT:
+            if node_model == "router":
+                return Images.get("router")
+            if node_model == "host":
+                return Images.get(("host"))
+            if node_model == "PC":
+                return Images.get("pc")
+            if node_model == "mdr":
+                return Images.get("mdr")
+            if node_model == "prouter":
+                return Images.get("prouter")
+            if node_model == "OVS":
+                return Images.get("ovs")
+        else:
+            logging.debug("INVALID INPUT OR NOT CONSIDERED YET")
+
 
 def load_core_images(images):
     images.load("core", "core-icon.png")