swarm/network/simulation/http.go


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// 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)
}