1 files changed, 144 insertions, 0 deletions
diff --git a/swarm/network/simulations/overlay.go b/swarm/network/simulations/overlay.go
new file mode 100644
index 000000000..9419de0c6
--- /dev/null
+++ b/swarm/network/simulations/overlay.go
@@ -0,0 +1,144 @@
+// 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/>.
+
+// You can run this simulation using
+//
+//    go run ./swarm/network/simulations/overlay.go
+package main
+
+import (
+	"flag"
+	"fmt"
+	"net/http"
+	"runtime"
+	"sync"
+	"time"
+
+	"github.com/ethereum/go-ethereum/log"
+	"github.com/ethereum/go-ethereum/node"
+	"github.com/ethereum/go-ethereum/p2p/discover"
+	"github.com/ethereum/go-ethereum/p2p/simulations"
+	"github.com/ethereum/go-ethereum/p2p/simulations/adapters"
+	"github.com/ethereum/go-ethereum/swarm/network"
+	"github.com/ethereum/go-ethereum/swarm/state"
+	colorable "github.com/mattn/go-colorable"
+)
+
+var (
+	noDiscovery = flag.Bool("no-discovery", false, "disable discovery (useful if you want to load a snapshot)")
+	vmodule     = flag.String("vmodule", "", "log filters for logger via Vmodule")
+	verbosity   = flag.Int("verbosity", 0, "log filters for logger via Vmodule")
+	httpSimPort = 8888
+)
+
+func init() {
+	flag.Parse()
+	//initialize the logger
+	//this is a demonstration on how to use Vmodule for filtering logs
+	//provide -vmodule as param, and comma-separated values, e.g.:
+	//-vmodule overlay_test.go=4,simulations=3
+	//above examples sets overlay_test.go logs to level 4, while packages ending with "simulations" to 3
+	if *vmodule != "" {
+		//only enable the pattern matching handler if the flag has been provided
+		glogger := log.NewGlogHandler(log.StreamHandler(colorable.NewColorableStderr(), log.TerminalFormat(true)))
+		if *verbosity > 0 {
+			glogger.Verbosity(log.Lvl(*verbosity))
+		}
+		glogger.Vmodule(*vmodule)
+		log.Root().SetHandler(glogger)
+	}
+}
+
+type Simulation struct {
+	mtx    sync.Mutex
+	stores map[discover.NodeID]*state.InmemoryStore
+}
+
+func NewSimulation() *Simulation {
+	return &Simulation{
+		stores: make(map[discover.NodeID]*state.InmemoryStore),
+	}
+}
+
+func (s *Simulation) NewService(ctx *adapters.ServiceContext) (node.Service, error) {
+	id := ctx.Config.ID
+	s.mtx.Lock()
+	store, ok := s.stores[id]
+	if !ok {
+		store = state.NewInmemoryStore()
+		s.stores[id] = store
+	}
+	s.mtx.Unlock()
+
+	addr := network.NewAddrFromNodeID(id)
+
+	kp := network.NewKadParams()
+	kp.MinProxBinSize = 2
+	kp.MaxBinSize = 4
+	kp.MinBinSize = 1
+	kp.MaxRetries = 1000
+	kp.RetryExponent = 2
+	kp.RetryInterval = 1000000
+	kad := network.NewKademlia(addr.Over(), kp)
+	hp := network.NewHiveParams()
+	hp.Discovery = !*noDiscovery
+	hp.KeepAliveInterval = 300 * time.Millisecond
+
+	config := &network.BzzConfig{
+		OverlayAddr:  addr.Over(),
+		UnderlayAddr: addr.Under(),
+		HiveParams:   hp,
+	}
+
+	return network.NewBzz(config, kad, store, nil, nil), nil
+}
+
+//create the simulation network
+func newSimulationNetwork() *simulations.Network {
+
+	s := NewSimulation()
+	services := adapters.Services{
+		"overlay": s.NewService,
+	}
+	adapter := adapters.NewSimAdapter(services)
+	simNetwork := simulations.NewNetwork(adapter, &simulations.NetworkConfig{
+		DefaultService: "overlay",
+	})
+	return simNetwork
+}
+
+//return a new http server
+func newOverlaySim(sim *simulations.Network) *simulations.Server {
+	return simulations.NewServer(sim)
+}
+
+// var server
+func main() {
+	//cpu optimization
+	runtime.GOMAXPROCS(runtime.NumCPU())
+	//run the sim
+	runOverlaySim()
+}
+
+func runOverlaySim() {
+	//create the simulation network
+	net := newSimulationNetwork()
+	//create a http server with it
+	sim := newOverlaySim(net)
+	log.Info(fmt.Sprintf("starting simulation server on 0.0.0.0:%d...", httpSimPort))
+	//start the HTTP server
+	http.ListenAndServe(fmt.Sprintf(":%d", httpSimPort), sim)
+}