grpc: implemened initial support for streaming emane pathloss events

daemon/core/api/grpc/client.py

@@ -31,6 +31,8 @@ from core.api.grpc.emane_pb2 import (
     EmaneLinkRequest,
     EmaneLinkResponse,
     EmaneModelConfig,
+    EmanePathlossesRequest,
+    EmanePathlossesResponse,
     GetEmaneConfigRequest,
     GetEmaneConfigResponse,
     GetEmaneEventChannelRequest,
@@ -1229,6 +1231,17 @@ class CoreGrpcClient:
         )
         return self.stub.WlanLink(request)
 
+    def emane_pathlosses(
+        self, pathloss_iter: Iterable[EmanePathlossesRequest]
+    ) -> EmanePathlossesResponse:
+        """
+        Stream EMANE pathloss events.
+
+        :param pathloss_iter: iterator for sending EMANE pathloss events
+        :return: EMANE pathloss response
+        """
+        return self.stub.EmanePathlosses(pathloss_iter)
+
     def connect(self) -> None:
         """
         Open connection to server, must be closed manually.

daemon/core/api/grpc/grpcutils.py

@@ -2,7 +2,9 @@ import logging
 import time
 from typing import Any, Dict, List, Tuple, Type
 
+import grpc
 import netaddr
+from grpc import ServicerContext
 
 from core import utils
 from core.api.grpc import common_pb2, core_pb2
@@ -13,7 +15,7 @@ from core.emulator.data import LinkData
 from core.emulator.emudata import InterfaceData, LinkOptions, NodeOptions
 from core.emulator.enumerations import LinkTypes, NodeTypes
 from core.emulator.session import Session
-from core.nodes.base import NodeBase
+from core.nodes.base import CoreNode, NodeBase
 from core.nodes.interface import CoreInterface
 from core.services.coreservices import CoreService
 
@@ -478,3 +480,23 @@ def interface_to_proto(interface: CoreInterface) -> core_pb2.Interface:
         ip6=ip6,
         ip6mask=ip6mask,
     )
+
+
+def get_nem_id(node: CoreNode, netif_id: int, context: ServicerContext) -> int:
+    """
+    Get nem id for a given node and interface id.
+
+    :param node: node to get nem id for
+    :param netif_id: id of interface on node to get nem id for
+    :param context: request context
+    :return: nem id
+    """
+    netif = node.netif(netif_id)
+    if not netif:
+        message = f"{node.name} missing interface {netif_id}"
+        context.abort(grpc.StatusCode.NOT_FOUND, message)
+    net = netif.net
+    if not isinstance(net, EmaneNet):
+        message = f"{node.name} interface {netif_id} is not an EMANE network"
+        context.abort(grpc.StatusCode.INVALID_ARGUMENT, message)
+    return net.getnemid(netif)

daemon/core/api/grpc/server.py

@@ -6,7 +6,7 @@ import tempfile
 import threading
 import time
 from concurrent import futures
-from typing import Type
+from typing import Iterable, Type
 
 import grpc
 from grpc import ServicerContext
@@ -39,6 +39,8 @@ from core.api.grpc.core_pb2 import ExecuteScriptResponse
 from core.api.grpc.emane_pb2 import (
     EmaneLinkRequest,
     EmaneLinkResponse,
+    EmanePathlossesRequest,
+    EmanePathlossesResponse,
     GetEmaneConfigRequest,
     GetEmaneConfigResponse,
     GetEmaneEventChannelRequest,
@@ -1751,3 +1753,17 @@ class CoreGrpcServer(core_pb2_grpc.CoreApiServicer):
             wlan.model.sendlinkmsg(n1_netif, n2_netif, unlink=not request.linked)
             result = True
         return WlanLinkResponse(result=result)
+
+    def EmanePathlosses(
+        self,
+        request_iterator: Iterable[EmanePathlossesRequest],
+        context: ServicerContext,
+    ) -> EmanePathlossesResponse:
+        for request in request_iterator:
+            session = self.get_session(request.session_id, context)
+            n1 = self.get_node(session, request.node_one, context, CoreNode)
+            nem1 = grpcutils.get_nem_id(n1, request.interface_one_id, context)
+            n2 = self.get_node(session, request.node_two, context, CoreNode)
+            nem2 = grpcutils.get_nem_id(n2, request.interface_two_id, context)
+            session.emane.publish_pathloss(nem1, nem2, request.rx_one, request.rx_two)
+        return EmanePathlossesResponse()

daemon/core/emane/emanemanager.py

@@ -37,7 +37,7 @@ if TYPE_CHECKING:
     from core.emulator.session import Session
 
 try:
-    from emane.events import EventService
+    from emane.events import EventService, PathlossEvent
     from emane.events import LocationEvent
     from emane.events.eventserviceexception import EventServiceException
 except ImportError:
@@ -48,6 +48,7 @@ except ImportError:
     except ImportError:
         EventService = None
         LocationEvent = None
+        PathlossEvent = None
         EventServiceException = None
         logging.debug("compatible emane python bindings not installed")
 
@@ -868,6 +869,21 @@ class EmaneManager(ModelManager):
             result = False
         return result
 
+    def publish_pathloss(self, nem1: int, nem2: int, rx1: float, rx2: float) -> None:
+        """
+        Publish pathloss events between provided nems, using provided rx power.
+        :param nem1: interface one for pathloss
+        :param nem2: interface two for pathloss
+        :param rx1: received power from nem2 to nem1
+        :param rx2: received power from nem1 to nem2
+        :return: nothing
+        """
+        event = PathlossEvent()
+        event.append(nem1, forward=rx1)
+        event.append(nem2, forward=rx2)
+        self.service.publish(nem1, event)
+        self.service.publish(nem2, event)
+
 
 class EmaneGlobalModel:
     """

daemon/proto/core/api/grpc/core.proto

@@ -149,6 +149,8 @@ service CoreApi {
     }
     rpc GetEmaneEventChannel (emane.GetEmaneEventChannelRequest) returns (emane.GetEmaneEventChannelResponse) {
     }
+    rpc EmanePathlosses (stream emane.EmanePathlossesRequest) returns (emane.EmanePathlossesResponse) {
+    }
 
     // xml rpc
     rpc SaveXml (SaveXmlRequest) returns (SaveXmlResponse) {

daemon/proto/core/api/grpc/emane.proto

@@ -90,3 +90,16 @@ message EmaneModelConfig {
     string model = 3;
     map<string, string> config = 4;
 }
+
+message EmanePathlossesRequest {
+    int32 session_id = 1;
+    int32 node_one = 2;
+    float rx_one = 3;
+    int32 interface_one_id = 4;
+    int32 node_two = 5;
+    float rx_two = 6;
+    int32 interface_two_id = 7;
+}
+
+message EmanePathlossesResponse {
+}