swarm: network simulation for swarm tests (#769)

* cmd/swarm: minor cli flag text adjustments

* cmd/swarm, swarm/storage, swarm: fix  mingw on windows test issues

* cmd/swarm: support for smoke tests on the production swarm cluster

* cmd/swarm/swarm-smoke: simplify cluster logic as per suggestion

* changed colour of landing page

* landing page reacts to enter keypress

* swarm/api/http: sticky footer for swarm landing page using flex

* swarm/api/http: sticky footer for error pages and fix for multiple choices

* swarm: propagate ctx to internal apis (#754)

* swarm/simnet: add basic node/service functions

* swarm/netsim: add buckets for global state and kademlia health check

* swarm/netsim: Use sync.Map as bucket and provide cleanup function for...

* swarm, swarm/netsim: adjust SwarmNetworkTest

* swarm/netsim: fix tests

* swarm: added visualization option to sim net redesign

* swarm/netsim: support multiple services per node

* swarm/netsim: remove redundant return statement

* swarm/netsim: add comments

* swarm: shutdown HTTP in Simulation.Close

* swarm: sim HTTP server timeout

* swarm/netsim: add more simulation methods and peer events examples

* swarm/netsim: add WaitKademlia example

* swarm/netsim: fix comments

* swarm/netsim: terminate peer events goroutines on simulation done

* swarm, swarm/netsim: naming updates

* swarm/netsim: return not healthy kademlias on WaitTillHealthy

* swarm: fix WaitTillHealthy call in testSwarmNetwork

* swarm/netsim: allow bucket to have any type for a key

* swarm: Added snapshots to new netsim

* swarm/netsim: add more tests for bucket

* swarm/netsim: move http related things into separate files

* swarm/netsim: add AddNodeWithService option

* swarm/netsim: add more tests and Start* methods

* swarm/netsim: add peer events and kademlia tests

* swarm/netsim: fix some tests flakiness

* swarm/netsim: improve random nodes selection, fix TestStartStop* tests

* swarm/netsim: remove time measurement from TestClose to avoid flakiness

* swarm/netsim: builder pattern for netsim HTTP server (#773)

* swarm/netsim: add connect related tests

* swarm/netsim: add comment for TestPeerEvents

* swarm: rename netsim package to network/simulation

1 files changed, 63 insertions, 0 deletions

diff --git a/swarm/network/simulation/http.go b/swarm/network/simulation/http.go
new file mode 100644
index 000000000..40f13f32d
--- /dev/null
+++ b/swarm/network/simulation/http.go
@@ -0,0 +1,63 @@
+// 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 (
+	"fmt"
+	"net/http"
+
+	"github.com/ethereum/go-ethereum/log"
+	"github.com/ethereum/go-ethereum/p2p/simulations"
+)
+
+// Package defaults.
+var (
+	DefaultHTTPSimAddr = ":8888"
+)
+
+//`With`(builder) pattern constructor for Simulation to
+//start with a HTTP server
+func (s *Simulation) WithServer(addr string) *Simulation {
+	//assign default addr if nothing provided
+	if addr == "" {
+		addr = DefaultHTTPSimAddr
+	}
+	log.Info(fmt.Sprintf("Initializing simulation server on %s...", addr))
+	//initialize the HTTP server
+	s.handler = simulations.NewServer(s.Net)
+	s.runC = make(chan struct{})
+	//add swarm specific routes to the HTTP server
+	s.addSimulationRoutes()
+	s.httpSrv = &http.Server{
+		Addr:    addr,
+		Handler: s.handler,
+	}
+	go s.httpSrv.ListenAndServe()
+	return s
+}
+
+//register additional HTTP routes
+func (s *Simulation) addSimulationRoutes() {
+	s.handler.POST("/runsim", s.RunSimulation)
+}
+
+// StartNetwork starts all nodes in the network
+func (s *Simulation) RunSimulation(w http.ResponseWriter, req *http.Request) {
+	log.Debug("RunSimulation endpoint running")
+	s.runC <- struct{}{}
+	w.WriteHeader(http.StatusOK)
+}