1 files changed, 65 insertions, 0 deletions
diff --git a/swarm/network/simulation/service.go b/swarm/network/simulation/service.go
new file mode 100644
index 000000000..d1cbf1f8b
--- /dev/null
+++ b/swarm/network/simulation/service.go
@@ -0,0 +1,65 @@
+// Copyright 2018 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+package simulation
+
+import (
+	"github.com/ethereum/go-ethereum/node"
+	"github.com/ethereum/go-ethereum/p2p/discover"
+	"github.com/ethereum/go-ethereum/p2p/simulations/adapters"
+)
+
+// Service returns a single Service by name on a particular node
+// with provided id.
+func (s *Simulation) Service(name string, id discover.NodeID) node.Service {
+	simNode, ok := s.Net.GetNode(id).Node.(*adapters.SimNode)
+	if !ok {
+		return nil
+	}
+	services := simNode.ServiceMap()
+	if len(services) == 0 {
+		return nil
+	}
+	return services[name]
+}
+
+// RandomService returns a single Service by name on a
+// randomly chosen node that is up.
+func (s *Simulation) RandomService(name string) node.Service {
+	n := s.randomUpNode()
+	if n == nil {
+		return nil
+	}
+	return n.Service(name)
+}
+
+// Services returns all services with a provided name
+// from nodes that are up.
+func (s *Simulation) Services(name string) (services map[discover.NodeID]node.Service) {
+	nodes := s.Net.GetNodes()
+	services = make(map[discover.NodeID]node.Service)
+	for _, node := range nodes {
+		if !node.Up {
+			continue
+		}
+		simNode, ok := node.Node.(*adapters.SimNode)
+		if !ok {
+			continue
+		}
+		services[node.ID()] = simNode.Service(name)
+	}
+	return services
+}