Add API get network link nodes

main.py

@@ -1391,6 +1391,7 @@ async def fastapi_set_option_properties(network: str, req: Request) -> ChangeSet
 async def fastapi_get_node_coord(network: str, node: str) -> dict[str, float] | None:
     return get_node_coord(network, node)
 
+# DingZQ, 2024-12-08, get all node coord
 @app.get("/getnetworkcoords/")
 async def fastapi_get_network_coords(network: str) -> list[str] | None:
     coords = get_network_coords(network)
@@ -1399,6 +1400,12 @@ async def fastapi_get_network_coords(network: str) -> list[str] | None:
         result.append(f"{node_id}:{coord['x']}:{coord['y']}")
     return result
 
+# DingZQ, 2024-12-08, get all links' start and end node
+# link_id:node_id1:node_id2
+@app.get("/getnetworklinknodes/")
+async def fastapi_get_network_link_nodes(network: str) -> list[str] | None:
+    return get_network_link_nodes(network)
+
 ############################################################
 # vertex 25.[VERTICES]
 ############################################################